ferrite transformer turns calculation for high

Ferrite Transformer Turns Calculation for High-FrequencySMPS Inverter

On different forums I often find people asking for help in calculating the required turns for a ferrite transformer they are going to use in high-frequencySMPS inverters In a high-frequencySMPS inverter the ferrite transformer is used in the step-upboost stage where the low voltage DC from the battery is stepped up to high voltage DC In this situation there are really only two choices when selecting topology ndash push-pull and full-bridge For transformer design the difference between a push-pull and a full-bridge transformer for same voltage and power will be that the push-pull transformer will require a center tap meaning it will require twice the number of primary turns as the full-bridge transformer

Calculation of required turns is actually quite simple and Irsquoll explain this here

For explanation Irsquoll use an example and go through the calculation process

Letrsquos say the ferrite transformer will be used in a 250W inverter The selected topology is push-pull The power source is a 12V battery Output voltage of the DC-DC converter stage will be 310V Switching frequency is 50kHz The selected core is ETD39 Remember that the output of the transformer will be high frequency AC (50kHz square wave in this case) When I refer to an output of high voltage DC (eg 310VDC mentioned above) this is the DC output obtained after rectification (using ultrafast recovery diodes configured as bridge rectifier) and filtration (using LC filter)

During operation the battery voltage does not stay fixed at 12V With high loads the voltage will be less than 12V With low loads and near-fully charged battery the voltage may be higher than 13V So it must be kept in mind that the input voltage is not constant but is variable In inverters the battery low-cut is usually set at 105V So wersquoll take this as our lowest possible input voltage

Vinmin = 105V

The formula for calculating the number of required primary turns is

For our push-pull transformer this will be one-half the required number of turnsNpri means number of primary turns Nsec means number of secondary turns Naux means number of auxiliary turns and so on But just N (with no subscript) refers to turns ratio

For calculating the required number of primary turns using the formula the parameters or variables that need to be considered are

Vin(nom) ndash Nominal Input Voltage Wersquoll take this as 12V So Vin(nom) = 12 f ndash The operating switching frequency in Hertz Since our switching frequency is 50kHz

f = 50000 Bmax ndash Maximum flux density in Gauss If yoursquore used to using Tesla or milliTesla (T or

mT) for flux density just remember that 1T = 104 Gauss Bmax really depends on the design and the transformer cores being used In my designs I usually take Bmax to be in the range 1300G to 2000G This will be acceptable for most transformer cores In this example letrsquos start with 1500G So Bmax = 1500 Remember that too high a Bmax will cause the transformer to saturate Too low a Bmax will be under utilizing the core

Ac ndash Effective Cross-Sectional Area in cm2 You will get this information from the datasheets of the ferrite cores Ac is also sometimes referred to as Ae For ETD39 the effective cross-sectional area given in the datasheetspecification sheet (Irsquom referring to TDK E141 You can download it from here wwwtdkcojptefe02e141pdf ) the effective cross-sectional area (in the specification sheet itrsquos referred to as Ae but as Irsquove said itrsquos the same thing as Ac) is given as 125mm2 That is equal to 125cm2 So Ac = 125 for ETD39

So now wersquove obtained the values of all required parameters for calculation Npri ndash the number of required primary turns

Vin(nom) = 12 f = 50000 Bmax = 1500 Ac = 125

Plugging these values into the formula

Npri = 32

We wonrsquot be using fractional windings so wersquoll round off Npri to the nearest whole number in this case rounded down to 3 turns Now before we finalize this and select Npri = 3 we better make sure that Bmax is still within acceptable bounds As wersquove decreased the number of turns from the calculated figure (down to 30 from 32) Bmax will increase We now need to figure out just how much Bmax has increased and if that is still an acceptable value

Vin(nom) = 12 f = 50000 Npri = 3 Ac = 125

Bmax = 1600

The new value of Bmax is well within acceptable bounds and so we can proceed with Npri = 3

So we now know that for the primary our transformer will require 3 turns + 3 turns

In any design if you need to adjust the values you can easily do so But always remember to check that Bmax is acceptable

For example if for construction difficulties winding 3 turns + 3 turns becomes difficult you may use 2 turns + 2 turns or 4 turns + 4 turns Increasing number of turns wonrsquot hurt ndash yoursquoll just be under utilizing the core However decreasing number of turns increases Bmax so just recheck to make sure Bmax is okay The range Irsquove stated for Bmax (1300G to 2000G) is just an estimate It will work for most cores However with many cores you can go higher to decrease the number of turns Going lower will just be under utilizing the core but may sometimes be required if number of turns is too low

Irsquove started off with a set Bmax and gone on to calculate Npri from there You can also assign a value of Npri and then check if Bmax is okay If not you can then increase or decrease Npri as required and then check if Bmax is okay and repeat this process until you get a satisfactory result For example you may have set Npri = 2 and calculated Bmax and decided that this was too high So you set Npri = 3 and calculated Bmax and decided it was okay Or you may have started with Npri = 4 and calculated Bmax and decided that it was too low So you set Npri = 3 and calculated Bmax and decided it was okay

Now itrsquos time to move on to the secondary The output of our DC-DC converter is 310V So the transformer output must be 310V at all input voltages from all the way up from 135V to all the way down to 105V Naturally feedback will be implemented to keep the output voltage fixed even with line and load variations ndash changes due to battery voltage change and also due to load change So some headroom must be left for feedback to work So wersquoll design the transformer with secondary rated at 330V Feedback will just adjust the voltage required by changing the duty cycle of the PWM control signals Besides feedback the headroom also compensates for some of the losses in the converter and thus compensates for the voltage drops at different stages ndash for example in the MOSFETs in the transformer itself in the output rectifiers output inductor etc

This means that the output must be capable of supplying 330V with input voltage equal to 105V and also input voltage equal to 135V For the PWM controller wersquoll take maximum duty cycle to be 98 The gap allows for dead-time

At minimum input voltage (when Vin = Vinmin) duty cycle will be maximum Thus duty cycle will be 98 when Vin = 105 = Vinmin At maximum duty cycle = 98 voltage to transformer = 098 105V = 1029V

So voltage ratio (secondary primary) = 330V 1029V = 321

Since voltage ratio (secondary primary) = 321 turns ratio (secondary primary) must also be 321 as turns ratio (secondary primary) = voltage ratio (secondary primary) Turns ratio is designated by N So in our case N = 321 (Irsquove taken N as the ratio secondary primary)

Npri = 3

Nsec = N Npri = 321 3 = 963

Round off to the nearest whole number Nsec = 96

Thus 96 turns are required for the secondary With proper implementation of feedback a constant 310VDC output will be obtained throughout the entire input voltage range of 105V to 135V

Here one thing to note is that even though I took 98 as the maximum duty cycle maximum duty cycle in practice will be smaller since our transformer was calculated to provide 330V output In the circuit the output will be 310V so the duty cycle will be even lower However the advantage here is that you can be certain that the output will not drop below 330V even with heavy loads since a large enough headroom is provided for feedback to kick in and maintain the output voltage even at high loads

If any auxiliary windings are required the required turns can be easily calculated Let me show with an example Letrsquos say we need an auxiliary winding to provide 19V I know that the output 310V will be regulated whatever the input voltage may be within the range initially specified (Vinmin to Vinmax ndash 105V to 135V) So the turns ratio for the auxiliary winding can be calculated with respect to the secondary winding Letrsquos call this turns ratio (secondary auxiliary) NA

NA = Nsec Naux = Vsec (Vaux + Vd) Vd is the output diode forward drop Letrsquos assume that in our application a schottky rectifier with a Vd = 05V is used

So NA = 310V 195V =159

Nsec Naux = NA

Naux = Nsec NA = 96 159 = 596

Letrsquos round off Naux to 6 and see what the output voltage is

Vsec (Vaux + Vd) = NA = Nsec Naux = 96 6 =160

(Vaux + Vd) = Vsec NA = 310V 160 = 19375V

Vaux = 19375V ndash 05V = 18875V (rounded off)

I would say thatrsquos great for an auxiliary supply If in your calculations you come to a voltage that is too far off the required target voltage and thus greater accuracy is required take Vaux as something higher and use a voltage regulator

For example if in our previous example instead of18875V we had gotten 198V but needed more accuracy we couldve used 24V or thereabouts and used a voltage regulator to give 19V output

So there we have it Our transformer has 3 turns + 3 turns for primary 96 turns for secondary and 6 turns for auxiliary

Herersquos our transformer

Calculating required number of turns for a transformer is actually a simple task and I hope that I could help you understand how to do this I hope this tutorial helps you in your ferrite transformer designs Do let me know your comments and feedback

Posted by Tahmid at 423 PM Email This BlogThis Share to Twitter Share to Facebook Share to Pinterest

196 comments

1

sandy December 24 2012 at 830 AM

yes thamid it helps me very muchi have a dought generally ferrite transformers required high frequency to drive is 50khz enough to convert 12vdc to 310vdc

one more question home appliances required 230v then y we go for 310v

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1

AnonymousDecember 28 2012 at 507 AM

310 = 230V RMS

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2

Tahmid December 24 2012 at 1214 PM

Hi sandyIm glad that my tutorial has helped you

1) 50kHz is enough for use with ferrite transformer Frequencies between 20kHz and 100kHz are usually used with 30kHz 50kHz 75kHz and 100kHz being common frequencies

2) I assumed 220V instead of 230V I was thinking of sine wave inverter So to obtain a sine wave with RMS 220V the peak must be 220V sqrt(2) = 311V [sqrt(2) means square root 2 which is equal to 14142135] So I took 310V since the DC bus voltage will be the peak voltage When SPWM (sinusoidal pulse width modulation) is carried out you will receive an output of 220V

If you are interested regarding SPWM you may go through these

httptahmidmcblogspotcom201101generation-and-implementation-of-sinehtmlhttptahmidmcblogspotcom201210smart-sine-software-to-generate-sinehtmlhttptahmidmcblogspotcom201210generation-of-sine-wave-using-spwm-in_10htmlhttptahmidmcblogspotcom201211feedback-in-sine-wave-inverter-pic16fhtml

Hope this helpsTahmid

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3

sandy December 24 2012 at 1148 PM

yes thamid i have a small request i am trying to develope a 150w inverter with smps transformer plz give your mail or send me a mail to this sandynani5gmailcom i will send my circuit diagram to your mail plz verify it for my satisfaction

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4

veera December 27 2012 at 559 AM

dear tahmid Its really helpful for me I was designing boost converter for my solar home ups I need help from after reading the following link httptahmidmcblogspotin201209some-of-my-smps-circuitshtmlI was in need of LCR Mere circuit can you post the firmware and circuit

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1

Rupali Sds May 14 2013 at 928 AM

Thanks for sharing this infoPlease visit my site also-design of transformer

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5


You can get it if you search on Google A good design was I think the IronBark LC Meter Do take a look

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6


Thanks for your reply

regards veera

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7

Rony Chakraborty January 8 2013 at 926 AM

Dear Thamid I live in Chittagong Im also doing Power electronics research Please contact me at electroronygmailcom or my website is wwwekushebanglacom

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8

Tahmid January 8 2013 at 103 PM

HiIf you are interested in contacting me you can email me at inferno-rage (at) hotmailcom

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1

AnonymousNovember 20 2014 at 228 AM

Hi TahmidIt will be good if you post information about EMI filters for Inverters at the input

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9

segar January 20 2013 at 835 AM

hi tahmid the circuits i have see its useful for any fast projects

i have idea to build power inverter 6kw out put and input voltage is 48vdc the output voltage is 240vac but in here i want to use SMPS transformer to built and the power mosfet can you help me to have any idea to guide me to help on it thanks so keep and touch

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10


hiTAHmid I forgot give you online email you can directly email me via segarlinktechgmailcom and also we can share many more on it TAHMID my name is SEGAR

THANKS BYE

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11

Tahmid January 20 2013 at 1111 AM

HiUse SG3525 to feed into high-low side drivers that drive MOSFETs in full-bridge configuration These MOSFETs will drive a ferrite transformer Rectify and filter the output Thats the DC-DC stage done AC conversion stage will depend on a lot of things most important being the desired otuput My hunch is that its sine wave So use microcontroller and high-low side drivers to generate SPWM and drive MOSFETs in bridge configuration Filter the output of the bridge and you have a sine wave output

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12

YtsocJanuary 24 2013 at 1040 AM

Hello tahmid

I am planning on building a msps for a car amp The amp requires a single 50v rail and 300wattsI rather design the smps to be able to deliver this power continously rather than applying some music coeficientSo 300w 12v to single 50v (regulated) My big problem is choosing the transformer core To be more precise how do i know how much power can a core handle I know this varies with the frequency but have no idea how to determine itFor example in herehttpwwwirfcomtechnical-inforefdesignsiraudps1pdf they use a 29mm ring core for 500w(or even 1kw if i understood corectly) I have this core witf 3F3 material httpwwwfarnellcomdatasheets1595842pdf

Will this core be able to handle the 300W continously Also for this core Bmax should be 100mTThank you

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1

Tahmid February 18 2013 at 738 AM

How much power a core can handle depends on the core itself and varies from manufacturer to manufacturer Other factors that affect the power include operating frequency selected topology etc

A rough idea can be found in Abraham Pressmans Switching Power Supply Design book

I will take a look at the core datasheets you have linked to and let you know more

RegardsTahmid

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13

AnonymousFebruary 18 2013 at 717 AM

hi i really love your tutorials but i would like to ask how i would go about when in comes to winding transformers for switch mode power suppliesdoes the same rule apply and i would also like you to email me a h-bridge inverter circuit i would love to construct one for my final year project my email address is djultra0008gmailcom thanks

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1


Hi

The tutorial presented here is for switch mode power supplies I had the push-pull and full-bridge SMPS transformers in mind when designing it Of course I had in mind a low voltage to high voltage converter although the same ideaprinciple can be applied for high voltage to low voltage converter

As for the H-bridge circuit I suggest you do some research and design the circuit If youre stuck somewhere then I can try to help

RegardsTahmid

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14

dj February 23 2013 at 233 AM

how can we calculate b(max)flux density for E55 core can u please tell meinput voltage 12 volts dcoutput 350 volts dc

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1

Tahmid February 23 2013 at 445 PM

Choose something between 1300G and 2000G That shouldnt be a problem How about starting with 1500G

RegardsTahmid

2


such a gr8 blogplease visit my site alsoPotential Transformers

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15


by using push pull topology

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16


dude how do we know that specific core has specific gauss am using E55 core can u tell me how much gauss it will be and for e65 core also please tell me how much gauss it will bereply me soon

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17


A core doesnt have a specific flux density You choose what flux density the core is to be operated This is done by selecting the number of turns with respect to the applied voltage A core has a limit up to which the flux density can be This is usually quite a bit larger than 3000G So by selecting an operating max flux density in the range 1300G to 2000G were playing it safe

RegardsTahmid

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1

Muhammad Abrar December 15 2013 at 139 PM

Hi Tahmid i found your articles very informative and helpfulcan we use 1300G to 2000G fulx density for 50 or 60 hz transformer if yes then what will be the turns fromula

thanksragards MAbrar

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18


hi tahmid i have some h-bridge circuits i would like to share with you how can i get it across to you one involves the popular tl494 and the other involves the use of the use of the 556 and cd4013 and another involve the ir2153 chip i would like you to have a look at them and i need a few explanation on some areas my email is djultra0008gmailcom thnks

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1


Upload the files to a file storage site such as rapidshare and share the links here Just remember to make the files public

RegardsTahmid

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19

AnonymousMarch 1 2013 at 1057 AM

plz tahmid bro tell me calculations for full bridge same as u have explained push-pull here i seriously need them for my final year project plz reply me on my emailmuhammadmohiuddinlivecom

or plz post it on your blog i will vist it sometime later thanx

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1

Tahmid March 1 2013 at 1150 AM

If you go through this tutorial here youll see that Ive mentioned that the same calculation can be used for push-pull and full-bridge The only difference will be that where in a push-pull transformer the primary consists of Npri + Npri turns the full-bridge transformer will only have Npri turns for the primary - no center tap

RegardsTahmid

2

কৌশি July 31 2014 at 243 AM

ভাই সালাম শিবে আশিম ভাবেলা বে শিছ শি তবে শিখবেত কৌষটা শিছ আশিম আই শি এসা এ টরানসফম ধবেত কৌষটা শিছ শিনত এ এ জায়গায় এএটা সাতর এখ সাঠি ভাবে বে উঠবেত শিছ শি ভাবে পরাইম+ ও কৌসাবেনডা+ ও মবা অফ টা1 কৌ বে আ কৌটাই সাঠি হবে আ কৌটা কৌঠি হবে অগরহ বে জাবেলা খই উ হয় শি5জা শি5জা শি5জা

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20

Rony Chakraborty March 5 2013 at 1020 PM

Hi Thamid Can u please describe How to select a core for a certain power suppose i need 500w output power and i also have Ac an Al values form core datasheet now how to calculate delivered power Actually it will be very helpful for ur reader if you refer using to relation between area product winding area and core area You know what i mean And thanks for a good artical

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1


Hi

Ill try to write an article on this topic and post it soon Thanks for the suggestion

RegardsTahmid

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21

abm March 7 2013 at 126 PM

Hi Tahmid please can this calculation work for torroidal cores as well

thanks

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1

Tahmid March 11 2013 at 1249 PM

It should - just take the appropriate values from the datasheet Although I havent thought of it before Its intersting and its good that you brought it up It should work But just to be sure Ill research into it and let you know In the mean time you could do some searching too You might learn something interesting

RegardsTahmid

2


thanks tahmid just another issue its not easy getting these ferrite transformer here let alone getting the datasheet i use to try salvaging the ones from computer psu please how can i identify the type of transformer they are eg etd39 or etd49 and so on do you have experience with this pleae help out thanks

3


Look for the datasheet eg for ETD39 or ETD49 The number (eg 49 or 39) is dependent on the dimensions of the core The preceding letters (ETD) denote the shape and type of transformer So by matching the dimensions of your core against the datasheet figures you can identify which core

Common cores used in computer power supplies are EI33 (most popular) and ERL35

RegardsTahmid

4

abm April 12 2013 at 946 PM

thanks i will sure check them out more but please do you know where i could get this cores in india

5

Tahmid April 22 2013 at 542 AM

I think you should be able to get them quite easily I know that Farnell India which I think is now element14 has quite a lot of them

RegardsTahmid

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22

AnonymousMarch 11 2013 at 1200 PM

hi tamid could you pls check out this h-bridge circuit use this link httpsrapidsharecomfiles850668221ir215320fill-bridgepng my email is djultra0008gmailcom i would post some later

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1


Ill see and let you know

RegardsTahmid

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23

star March 16 2013 at 1250 PM

sir plz given me inverter circuit diagram on this transformerplz sir tahmid needed me inverter circuit diagram of this ferrite core transformerthis transformer of any not found circuit diagram now me

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1


You can design the circuit yourself using the SG3525 PWM controller Ive written an article tutorial regarding using the SG3525 httptahmidmcblogspotcom201301using-sg3525-pwm-controller-explanationhtml

Hope you find this helpful

RegardsTahmid

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24


or some circuit diagram received but the diagram in auxiliary winding not found

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1


The transformer was calculated using an example You can use the calculation methodology for your own use in your own circuits

RegardsTahmid

2


hello Tahmid keep the good work going I am running into a lot of problems that only u can help me I recalculated my primary turns for 24v transformer in the formular u gave but when I check I am getting nearly two times the secondary voltage i worked it out for Is there anything else to be changed in the formular other than the input nominal voltage from 12 to 24 v when working out the turns for the transformer Thank u

3


Recheck the calculations carefully to make sure youve done them correctly

Make sure you have an LC filter and a minimum load at the output Dont measure the output voltage without load feedback or LC filter With no load the output capacitor will charge to the peak voltage Without the load and LC filter you wont obtain the averaging desired and output will be too high

RegardsTahmid

4


thank you Tahmid for your support I will do as u suggest because i was checking the voltage without load

5


Youre welcome

Do let me know the results

RegardsTahmid

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25


sir your answer of waiting

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1


Sorry for the late replies I was very busy with school exams

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26


plz tell me where do u liveplzdont your mind plzi m only asking

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1


I live in Dhaka What about you

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27

dj March 19 2013 at 210 AM

Hi TahmidThanks for supporting designers

we r working on 1KW inverter with below specs

12v-350v dc-dc converter with pushpull topology

e65 core ferrite

full bridge topology with igbt for ac-dc inversion

we r planning to provide the isolated feedback with a transformer

transformer specs are input will be from e65 core transformer and output must be scaled down to 5v dc to connect to sg3525

plz provide us the details of the transforme like core to be used and no tunrs

thanks in advance

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1


You can calculate the transformer turns if you thoroughly go through this tutorial All steps have been covered

RegardsTahmid

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28

star March 19 2013 at 230 AM

tahmid plz tell me inverter circuit diagram 12v to 220v step up on this trnasformer ferrite coreif you are knowledge

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1


Go through this httptahmidmcblogspotcom201301using-sg3525-pwm-controller-explanationhtml

RegardsTahmid

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29


hi tahmid thanks for your formula on calculating the primary and secondary turns for ferrite etd 39 core i understand the nominal voltage in which is 12 the switching frequency 50khz which is 50000 the bmax or flux density you choose to be 1500 and the core area 125cm2 to give 330V but i dont know how you arrive at the 10 to the eighth power or the number 4 placed in the formula could you please give an explanation on it because i would truely appreciate it and secondly if i am going to calculate the number of primary and secondary turns for the transformer to work from 24VDC do i just have to put in 24 as the nominal voltage in or there is other things in the formula that will have to be adjusted or changed i truely have high regards for your work time and your answers to our questions thanks again please give an answer at anytime within your convenience thanks

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1


Hi

Thanks for the compliments

The 10^8 term comes due to conversion of the different units to standard units ie from cm^2 to m^2 and Gauss to Tesla You can eliminate the term 10^8 if you use m^2 instead of cm^2 and Tesla instead of Gauss

Remember that 1 m^2 = 10^4 cm^2 and that 1T = 10^4 G Thats where the 10^8 comes from

I hope that clears things up

You can just put in 24VDC there Nothing else needs to be adjusted

Wishing you success on your projectTahmid

2


thanks tahmid i fully understand everything worked on my project and everything is working well but one more thing the 98 duty cycle you choose to calculate the number of secondary turns is it that you must use 98 or you can choose a lower duty cycle and whether the duty cycle is high or low what effect would it have on running home appliances thanks again you are the BOSS

3



I chose 98 as a maximum to prevent cross-conduction In practice itll be much lower due to feedback There isnt a benefit to running it low Instead youll need more turns on the transformers

Feel free to ask if you have any further questionsqueries

RegardsTahmid

4


hi tahmid my project has been successful so far but i need to get something clear about FEEDBACK i plan to have 288VDC at the output of my dc-dc converter with lc filter feedback and a minimum load so from pin 16 to pin 2 of the SG3525 i put a 5k6 resistor thus voltage at pin 2 is 32 from the output of the dc-dc converter i put a 450k resistor to pin 1 and 5k from pin 1 to ground so the voltage at pin 1 and 2 are equal so 4505 would give a 901 resistance ratio so 9032 would be 288 NOTE BRIEFLY i am operating from 24VDC i made my calculations for primary turns using the formula checked b max and everything is in acceptable position i know i need some headroom for FEEDBACK to work so i took 98 duty cycle and calculate 098225 minimum voltage which gives 2205 so i calculate my secondary turns by taking 308V2205=1396 so 13967 which is my number of primary turns gives 9777 rounded off to 98 to be my number of secondary turns do you think my calculations is right i am looking forward for your reply thanks again in advance and remember you are the BOSS

5


If you put a 5k6 resistor from pin 16 to pin 2 with no other resistor from pin 2 to ground the voltage at pin 2 will be 5V and not 32V as you have mentioned

The resistance ratio will be 911 and not 901 as you have mentioned

RegardsTahmid

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30

siktecMarch 21 2013 at 1151 AM

hi Tahmidhow do i determine the current rating of wire for a particular transformer power

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1


This will depend on the wire itself You can get charts online Just Google for wire current rating tables or charts There are loads available

RegardsTahmid

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31


Hi Tahmidabout the ferrite transformer above how about the diameter of wirewhether does not effect with the output voltagethank you for your advise

BRHeri

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1


Choose the wire such that it can carry the entire current without heating significantly However dont use thick wires Theyll suffer due to skin effect Use multiple thin wires

Take a look at this

httpwwwpowerstreamcomWire_Sizehtm

RegardsTahmid

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32

Amruth March 23 2013 at 109 AM

Hi TahmidThis is an excellent post Please elaborate on wire sizing is there any different wiring sizing for high frequency transformers

ThanksAmruth

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1


Hi

Ill definitely write an article for wire selection For now know that you need to choose the wire such that it can carry the entire current without heating significantly However dont use thick wires Theyll suffer due to skin effect Use multiple thin wires

Take a look at this


RegardsTahmid

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33

Udey Raj March 23 2013 at 616 AM

Thanks for sharing it is relevant beneficial information

Transformer turns ratio meter

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1


Im glad you found it helpful

RegardsTahmid

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34


the 98 duty cycle you choose when calculating the number of secondary turns could you choose a lower duty cycle and what effect would it have when load is applied to the dc to dc converter

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1


98 is the maximum duty cycle that I have taken to be allowable This has been done to prevent cross-conduction between switching devices which would result in a short-circuit There isnt much of an advantage to using a lower duty cycle The actual duty cycle will be much lower than this in normal operation due to the implementation of feedback

RegardsTahmid

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35


Hi Tahmid I think this is the best pratical inverter building forum on the internet u are teaching the world I have been trying to put together an inverter over a year now and it since I saw ur blog I am getting some good resultsI have three questions1 with no AC load on my h bridge should i be getting my 5v drive voltage on the gates of the fets in the dc-dc converter I am using one of ur drive circuits( My voltage only comes on when a load is connected and increase with added load off when there is no load ) 2 My AC voltage increases with the amount of load I apply eg from 125 to 140v AC which stage could be giving me this problem I am using 556 and 4013 configurationThank u for ur ususal support

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1


Thanks man I hope to add more and make my blog even better Your ideas and suggestions are welcome

1) There should always be a load at the H-bridge output Testing without load can give erroneous readings Which driver are you using Can you show the schematic

2) It could be the drive stage A circuit diagram will reveal where the problem may lie Without a diagram all Ill be doing is guessing

You can upload your schematic to imageshack or photobucket or other such site

RegardsTahmid

2

l youngMarch 27 2013 at 155 AM

Thank u for your reply Thamid but i am not sure I got A Clear answer I said I want to know if i should have the drive volt on the gate of the fet any at all with no load connected to the h bridge or only when a load is applied this voltage should come up on the gate I am using a drive circuit similar to you figure 5 design the only difference is there is no 10k from base to ground on my circuit Could u answer the other part of the question about the increase in AC voltage with increase load which stage could be giving me that problem Thank you for usual support

3


The drive voltage doesnt show properly on the high-side due to the virtual ground If you must test it remove the MOSFETs connect VS to ground and test the voltage and frequency at HO with respect to ground If alls well remove the short from VS to ground and then connect the MOSFETs

Regarding voltage difference itll be difficult to try to figure out where the problem lies without taking a look at the circuit diagram Make sure that the driver circuit is working properly It sounds like a problem in the driver circuit even though nothing can be said with certainty without taking a look at the circuit

I suggest that you instead of using 556 and 4013 use SG3525 That will be better Then just feed the otuput of the SG3525 to the MOSFET high-low side drivers

I hope you have received the answer to your questions Feel free to ask if you have any query or doubt

RegardsTahmid

RegardsTahmid

4

l youngApril 2 2013 at 1112 PM

Thank you Thamid for your reply I will check to see my drive circuit is working properly One more question which design is better to handle heavier loads the paralell or series transformer configuration in the dc to dc converter Thank you for your support

5


I recommend using one transformer instead of multiple in seriesparallel However if you must use more than one transformer you should use the converters in parallel and not the transformers themselves For example if youre using push-pull topology and have two transformers use two push-pull stages to drive both transformers both from the same input signal You can connect the outputs in parallel with current limiting

RegardsTahmid

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saiApril 1 2013 at 938 PM

hi tahmidi am new to this smps stuff i have been following all your you-tube posts and blogs on eda board i am building a 1kw smps inverter according to the circuit diagram you gave in ur link the only problem is that i am unable to find ft37-77 core so could u please help me by suggesting an etd core as an alternative to toroid core and ways to wind it with copper wirei will be really thankful

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Hi

Could you please mention which link (1kW SMPS inverter) you are talking about

You can choose one of the higher power ETD cores for this purpose Some cores you may be able to use are ETD49 ETD54 etc Of course you need to keep in mind other factors such as winding frequency etc

Hope this helps

RegardsTahmid

2


thanks a lot for responding tahmid i am building a 1kw inverter based on push pull topology for the dc boost stage which is 12v to 32o v dc using ka3525 pwm chip as in ur link at 50 khz initially i thought of using ft37-77 core but later realized i cant find them in herei know very little about winding an ETD core so i thought if u could help in selecting an ETD and procedure for winding itthnks again

3


here is the link to the circuit diagram httpwwwzidducomdownload21937039invertercircuitpnghtml

4


I have mentioned some ETD core names in the above post

My antivirus and browser prevent the webpage (where you uploaded the circuit diagram) from loading due to a suspected web attack Please upload again or to another file storage site

RegardsTahmid

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AnonymousApril 2 2013 at 848 PM

hi again tahmid my project is more successful as i go along according to your blog on ferrite transformer turns calculation i now have a clear understanding on how to work it out with respect to voltage frequency bmax and all that but there is a few things i want to get more clearly my questions to you now is at a switching frequency of 50 khz if i use 22 awg wire to wind the transformer if i change my switching frequency to 75 khz do i need a smaller wire like about 26 awg to wind the transformer next do i have to use a higher switching frequency for a higher wattage inverter or it does not matter as long as the calculations are right thanks again for your usual support

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Yes as switching frequency increases you should look to use thinner wire

Refer to this charthttpwwwpowerstreamcomWire_Sizehtm

You can use a not too high frequency and just make sure that the calculations are correct Keep in mind that the higher the switching frequency the lower the required inductance capacitance and transformer turns but the higher the switching losses

Hope this helps

RegardsTahmid

2


thanks tahmid all this really helps so to be more clear on all this you are saying its best to use a lower switching frequency for higher wattage inverters and one more thing i have seen inverters with the transformers in parallel connection and some with the transformers in series connection which do you think works betterthanks again for your support

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AnonymousApril 3 2013 at 709 AM

hi tamid i designed a 47kz push pull 12v to 310v converter but there is problem i seem to be getting close to 500vdc when rectified i am using an ei33 core ripped from a computer power supply though i have not yet implemented the feedback yet i did all the calculation for the transformer and got 3 + 3 turns for primary and 100 turns for secondary i am wondering if is bcos i winded the primary turns first b4 secondary i chose 1600g as flux pls any help would be appreciated

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You have to use feedback Without feedback youll be running at near 100 duty cycle which will mean very high voltages Remember that the calculations are done assuming that proper feedback is in place The feedback circuitry is to regulate the output voltage depending on input line voltage and output load The nominal operating duty cycle with correct feedback implementation will be quite a bit lower than 100

Hope this helps

RegardsTahmid

2

L YoungApril 11 2013 at 804 PM

Hello Tahmid I have attached the inverter circuit to an email and sent it to ur email address This is the circuit I am having the gate voltage problem withPlease check to see if there is a circuit error Thank you

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herisetiawan April 9 2013 at 1202 AM

Hi Tahmidi have ferrite core Type E552828 httpwwwferroxcubecomprodassetsecoreshtmwith Ae 420mm2 = 420cm2

my question is 1 i use TL394 for produce 38kHz for drive the push pull what the problem if i applied this transformer use push pull with frequency 38 kHz 2 can i produce 1500 Watt spms use this transformer at 38 kHz push pull3 what a good frequency for this application

Thnks

RegardsHeri

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Tahmid May 2 2013 at 544 AM

1) You can very easily use 38kHz No problems2) I think you should increase the frequency3) I would say 50kHz to 75kHz Make sure you use good MOSFET drivers driver circuits

RegardsTahmid

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40

Luminous Inverter Delhi April 11 2013 at 633 AM

Dear SirThanks for your valuble information about Ferrite Transformer you can give great help about transformerLuminous Inverter

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Tahmid June 22 2013 at 942 AM

Im extremely glad that youve found my blog helpful

RegardsTahmid

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hi tahmid your blog has helped me out the most sucessful way i have now managed to build a inverter using four dc-dc converters in parallel supplying 310vdc could u point me to a h bridge circiut that i could build with eight mosfets so i could get 230vac i really need this and thanks much again

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I am extremely glad that my blog has helped you I hope to make my blog even better to reach out to help many more people like you

For the PWM controller you can use SG3525 Set the frequency to 50Hz60Hz as required Ive written a tutorial covering the use of the popular PWM controller SG3525 Check it out herehttptahmidmcblogspotcom201301using-sg3525-pwm-controller-explanationhtml

For the MOSFET driver you can use IR2110 Ive written a tutorial covering the use of IR2110 for MOSFET drive in high-low side configurations (bridge configurations included) Check it out herehttptahmidmcblogspotcom201301using-high-low-side-driver-ir2110-withhtml

Hope this helps

RegardsTahmid

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42


hi again sir is there any difference with the h bridge in a 12 volt inverter than that of a 24 volt or its just a standard circuit or the h bridge circuit is built according to the wattage of the inverter thanks

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No matter what voltage you use the principle is obviously the same 24V is preferred over 12V for higher powers due to the lower current (for the same power output) This makes component selection and even wire selection easier and due to the lower current places less stress on the components as they need to handle half the current

RegardsTahmid

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43


hi tamid here is a funny senario i built a 12v-310v dc-dc converter using an e-i33 core the funny thing here is when i read the ac output section with my meter it shows250v but when i read the dc section its giving me 500vdc is that the recovery diodes are recovering too fast or what ithe diodes i am using is mur460 pls if you have any solution it would be helpful thnks

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Since your output is DC (youre using a DC-DC converter) you should be using the DC section of the voltmeter The AC section will give you incorrect reading

It sounds like youre measuring the output voltage with no feedback in place and with no load in place Place a sufficient load and use a feedback circuitry and then test again

RegardsTahmid

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44

jagadesh April 16 2013 at 1048 AM

hi tamid i wound a transformer with with 1 primary turn and 3 sec turns for a push pull my bm is 2230 for 20khz 6 volt input 335cm2 core area but i dont get any output at transformer can u plz help me

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How are you driving the transformer What is the switching device you are using Where do the drive signals come from

Your answering these questions will shed more light on the problem

RegardsTahmid

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45


hi tamid do pls know how to manually calculate the area of an etd core well since where i live it difficult to buy one so i usually come across so many core but with no labeling so i dont know the core type or its area if you any solutions it would be helpful thnks

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You can measure the dimensions of the core and match the values against the values of a standard datasheet to identify which core you have That way you can identify the core without needing to have labelling provided to you by your ferrite core supplier

RegardsTahmid

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okofishe April 21 2013 at 727 AM

when you say 3 turns + 3 turnsthat is a number of 6 turns in the primary with 2 wires sticking out or whatplease explain

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The transformer has a total of 6 turns primary with a center tap You take a wire Join one end to one of the bobbin pins - A Then wind three turns and join the other end to another bobbin pin - B Take another piece of wire and join one end to the end B In the same direction (clockwiseanticlockwise) in which you wound the first three turns wind three more turns Then attach the other end of the wire to another bobbin pin - C A is one end that goes to a MOSFET leg B is the center tap that goes to the positive supply (since this is for a push-pull converter) C is the other end that goes to another MOSFET leg

Hope this helps

RegardsTahmid

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47


hi tahmid thumbs up again for your blog i need some help on selecting some mosfets for my dc-dc converter for a 600 watts inverter ( push pull topology i use two irfz46n to drive my ferrite transformer but they heat and blow out in a short while the irfz46n is rated 50 amps so do i have to add more in parallel to my converter or do i need to purchase mosfets rated at higher amps for example irf3205 which is rated 110 amps and how much should i use PLEASE i need your help or do you have a way to calculate and parallel mosfets to add up to a certain AMP for 600 WATTS PLEASE give me your most clear answer on this and keep up the good work thanks again BOSS

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How much load did you have at the output when the MOSFETs blew

Which PWM controller are you using

Describe the MOSFET drivers you are using

RegardsTahmid

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48


hi again tahmid thanks for your continued help my question to you is i have a ferrite torodial core the effective cross sectional area in cm2 is 0946 could i use it in the formula for my transformer calculationsthanks again

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Yes you should be able to plug it in the formula for the calculation

RegardsTahmid

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49


hi tamid in your replies on me getting about 500v dc you said i should place a load on the output and then implement feedback the question is how do i place a load on a 310vdc output and what kind of load are you talking about coz i dont have a load that will take such voltage i am buliding a small inverter and hope to build the circuit in sections thnks

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Place any load that draws a current resulting in an output power of greater than minimum required power You can use 2 light bulbs in series You might use 2 60W or 100W incandescent bulbs in series

When you dont have sufficient load at the output the voltage rises to the peak voltage as the capacitor charges to the peak voltage Peak voltage in your cases seems to be 500V

RegardsTahmid

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50

Rupali Sds April 29 2013 at 644 AM

This is very useful blogThis blog is useful for constructionThanks for sharing this blogtransformer suppliers

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Im extremely glad to hear that youve found the blog useful Feel free to share any suggestions you may have

RegardsTahmid

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51

herisetiawan May 1 2013 at 1119 PM


my question is 1 i use TL394 for produce 38kHz for drive the push pull whether any problem if i applied this transformer use push pull with frequency 38 kHz 2 can i produce 1500 Watt spms use this transformer at 38 kHz push pull3 what a good frequency for this application

thank you very much

RegardsHeri

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RegardsTahmid

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52

AnonymousMay 4 2013 at 1136 AM

hi tamid in terms of feedback implementation how do i calculate my duty cycle for instance using the sg3535 setting pin 2 to 25v as reference how do i calculate the resistor values for pin 1 for a lets say 90 duty cycle since these pins are responsible for the duty cycle thnks

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You will get your answer here if you go through it thoroughly

httptahmidmcblogspotcom201301using-sg3525-pwm-controller-

explanationhtml

RegardsTahmid

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53

Sanjay May 17 2013 at 108 AM

hi siri red ur blog and lot of info in ur blog to me thank for u

my question is my projects primary turns are 4 i turn on my project but switching mosfet are short-circuit plz help me

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That could be due to a lot of things Without more information it would be too difficult to understand whats causing the error

Which controller are you usingWhich driver are you usingWhich topology are you usingDescribe the feedback circuitry youre usingWhat are the input and output specifications What frequency did you useWhat did you select as the maximum duty cycleWhich MOSFETs are you usingDescribe the transformer output sectionWhich transformer core are you usingWhat is your load

Your answering the above will help shed more light on to the problem

RegardsTahmid

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54

bretMay 17 2013 at 250 PM

hi Tamid Im bret from nigeria i really found your blog very useful since i discovered it keep the good work Pls i want you to tell me how to do the transformer turn calculation for an smps charger using the half bridge topology my chager is to handle about 30Amps and 138V output frm 220Vac input

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Take a look here

httptahmidmcblogspotcom201302ferrite-transformer-turns-calculation_22html

Im sure youll get your answer there

RegardsTahmid

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55

Trent Palmer June 10 2013 at 1205 AM

HelloThe airticle Ferrite Transformer Turns Calculation for High-FrequencySMPS Inverter is out standingI found so many entertaining stuff in your blogThanksDC to AC power inverter

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Im glad youve found it helpful

RegardsTahmid

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56

AnonymousJune 23 2013 at 954 AM

Hello Tahmid Your Transformer calculation post has help me a lot in designing DC-DC converter but recently I moved to DC_AC inverter I can use the method you post here for my high frequency low voltage DC to High voltage DC (20-400 VDC)tranformer design which works very well also for the 400v DC side filter inductor design I used the methods in Abraham pressman book and my filter works well BUT I am having problems with my SPWM wave input to Sine Wave output filter inductor I am not sure if I should use the same method of low pass filter inductor core design method used in DC filtering or is there any special consideration you have to take into account in design of magnetic material for SPWM filter inductor (for pure sine wave output) Sorry for the long wind post Your help will be greatly appreciatedFaruqNigeria

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Tahmid August 11 2013 at 304 AM

For LC filter choose values such that the resonant frequency is close to your output frequency If your frequency is 50Hz an LC filter with resonant frequency between 400Hz to 1500Hz should work well Then you need to size the inductor and capacitor Dont use too high an inductance - otherwise the output impedance will be very high Dont use too high a capacitance - this will create rush currents

RegardsTahmid

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57

AnonymousJune 26 2013 at 337 PM

Hello Thamid I have a question about the equation to calculate an output inductor for a forward converter with a transformer (full bridge) I actually have several formulas and all of them are no the same Which way do you use to calculate it

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Tahmid July 20 2013 at 414 PM

Take a look at this

httptahmidmcblogspotcom201303output-inductance-calculation-for-smpshtml

I think you should find that helpful

RegardsTahmid

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58

Nilesh SVadhar July 30 2013 at 339 AM

Nice post about SMPS transformers thanks for sharing nice information We are also Manufacturer amp Supplier SMPS transformer in India

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59

AnonymousAugust 4 2013 at 617 PM

Bro i want to design push pull invertor plz help me to design transformer input DC 40-45 V output 330-340 V and 500 W what turn ratio of transformer required

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Did you go through the entire tutorial Everything is covered in this article Please read it carefully and then ask me if you have any specific questions

RegardsTahmid

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AnonymousAugust 10 2013 at 243 AM

DearI want to design transformer for 240V to 500V Input of AC supply and Output is 35V DC with 200mA Pls suggest design guideline

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What kind of transformer are you designing

Are you using SMPS What topology

2

Johan Sagaert December 14 2013 at 1027 AM

Hi TahmidDo you still check your hotmail mailbox from time to time i would like some advice on winding high voltage secondariesFrom what i saw in microwave smps they seem to wind sections side by side instead of 1 layer over the other

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61


Hi Tahmid

Very nice tutorials you have put up here very informative

Tahmid need clarification on something Firstly there is no guide on the internet that shows how to wind a ferrite toroid yes

Reason is I`m trying to wind one and then to test it out Say my calculations state 5 turns primary so that means two wires on the primary side with the center two linking them serving as CT yes

Lastly the secondary and primary is wound the in the same direction Or can one just wound this bifilar style for primary over the many turns of secondary In my circuit I need a step up

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62

Transformer August 16 2013 at 223 PM

There is a big credit of transformer for getting us current constantly We cannot think about current without transformer So it is better to know about transformer for every people Thanks for sharing the information of transformer

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63

suki lee August 22 2013 at 708 AM

excellent blog about Inverter Manufacturingkeep on posting Inverter Manufacturer

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64

TDAugust 28 2013 at 122 AM

hi tahmidi have 2 qustion1st is i make like you tarnsformer it work fine but it out 330v dc how i convert this to 230v 50hz sine wave Ac voltage

2nd is i make transformer to 12v-24v to 330v Vin min = 9v Vin (nom) = 24v and it connect to 12v and out has a 40w bulb transformer sound like trrrrr why it is sound like trrrrr

please help me

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65

tecmax September 2 2013 at 759 AM

The voltage transformers are used in case of voltage fluctuations You can confer the rigth flow of electricity to the electrical appliances inside your home and save the same from damages Automatic Voltage Stabilizer Manufacturers Servo Stabilizer Manufacturers Isolation Transformer Manufacturers

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66

AnonymousOctober 1 2013 at 1116 AM

Hi really excellent blog thank you very very much that you are willing to share your knowledge not many do

Here is a question if I want to center tap the secondary to 96 + 96 turns does the formulation change on the primary side to get the same output as with 1 secondary winding

Or will the 2 secondaries just divided the output power between them

Thanks for the reply )

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67

ananth deepak October 8 2013 at 329 AM

hello siri need to convert dc input range of 80v to 150vand frequency range 160khz to 200khzusing e65 coreto 230v in acand power of 1kwplz help me

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68

bareeza power October 13 2013 at 458 PM

thank you this information was very helpful to me im designing smps to convert from 12vdc to 220vac 50hzIm wondering about what are the stages I should follow with arrangement using also I dont know how to calculate the suitable frequency for the circuitwhat is the most important element of the power supply I should choose first

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69

Alaap Jagdale October 20 2013 at 1230 PM

hello tahmid sir

please solve my doubt

how to calculate the gauge of the wire for your above given example of 3+3 turns amp 96 turns xmer 50khzcan we apply P=VI amp V=I(R+jXl) to find max ampere and accordingly the gauge or due to skin effect 50khz its better to use litz wire and if yes than of how many core wd respect to max current

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70

llan perez November 6 2013 at 216 PM

hola mi pregunta es como se comporta una bobina bifilar en un transformador de ferrita tipo E yo le inyecto un voltaje de 24vcc a 10khz sin conectarlo de manera tradicional si no en serie con la carga en este caso una celda tipo condensador de 1000uf

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71

AnonymousNovember 22 2013 at 1210 PM

Hi

I made my transformer with 8 primary and 100 secondary turn 33KHz ETD29 (76mm^2) with 11V input I get 10-15times more voltage while testing signal generator However when I use the voltage (11V) coming from FET (bf245) I see 200mV on the outputwhat is the reason for that any help is appreciated

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72

fmtech December 5 2013 at 735 AM

hi Tahmid pls can u help me with the code or connection for pic 16f72 sine-wave inverter to enable me make use of the normal off on switch not the soft push reset type thanks fmtech83 yahoocom

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73

Distribution transformer December 6 2013 at 620 AM

Hithis is really very helpful article I go through this site really very nice informationthank for sharing such a nice information

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74

Vasu Devan December 15 2013 at 751 AM

Dear Tahmid

Nice to see ur blog I am an electronics engineer working in thyristor based high current rectifiers I am planning for design a high frequency rectifier for high current ranges with bridge rectifier construction can u please guide me and help to design the same

My questions are1 for low voltage high current DC output bridge rectifier is suitable2 Can i follow your calculation for this rectifier3 what is the maximum current i can get from high frequency rectifier4 Any book which guide me for designing this system

thanksvasu

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75

AnonymousJanuary 6 2014 at 1023 AM

Hi tahmidU r amasing pls i need ur assintance on how to calculte Ac or Ae of a ferrite

transformerhow do I make d calclation for

I have aaa ferrite core transformer with dis diamension

42mm43mm15mm (Transformer) how d i calculate Ac or Ae

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76

Zeebee R January 15 2014 at 154 AM

This comment has been removed by a blog administrator

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77

Carli January 28 2014 at 1158 PM

Hi Tahmid

I have calculated a transformer for a Push-Pull SMPS that works with 12Vdc and the output is 410V It has 2+2 turns in the primary and 56+56 in the secondary with a EE4215 core In my country I canacutet found a company that make that transformer

Did you ever wound a transformer like this Any suggestion

Thanks you very much and congratulations for your blog that is very useful

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78

usama jaafar January 29 2014 at 1224 PM

Hi tahmid thanks a million for all your efforts Just got a question to ask does the same principle apply to toroidal transformer(in smps) If no then how do we calculate the relationship between input and output voltagepls assist thanks

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79

tecmax February 4 2014 at 417 AM

The isolation transformers are essentially devices that are used for the reduction of the power surges The safety and security of the devices can be accomplished by the installation of the devices

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80

sergulen yenidogan March 21 2014 at 720 PM

how do you determine the b max value

there is not such a value on the datasheets

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81

Wasim Ahmed March 28 2014 at 602 AM

hi dear can u share more article on this so that i can get more information on calculation transformer losses

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82

Nyza Shareef March 28 2014 at 828 AM

Hi very nice post Very useful information regarding isolation transformer and its uses Thanks for sharing this useful blog

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83

niranjan tiadi April 3 2014 at 724 AM

if i use primary of 21 turns and secondary of 3 turns and suppling 344volts dc then what voltage current and frequency will i get in secondary using ferrite core u type transformer

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84

Runthala Jaipur April 10 2014 at 548 AM

Many companies producing Power transformers in India Power transformers that will establish the service dependably with the web page Cost-efficient along with secure through the entire ages

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85

Pedro Cockwell April 15 2014 at 417 AM

how to calculate the seccion of de windings

gracias

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86

Boguslaw Brandys April 21 2014 at 1108 AM

This comment has been removed by the author

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87

Vathi rajan April 26 2014 at 737 AM

Nice post about Power Transformers thanks for sharing nice information We are Power Transformers Manufacturer amp Exporters in India

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88

Piyush Jha April 30 2014 at 429 AM

hi can you tell me what should i understand from the ferrite transformer symbol given as below

1 ) (104) (8i want to indicate here primary and secondary side by using )( it is 2 w transformer and output is 75v please tell me what is meaning of 1 4 and 108 here

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89

Rahees C May 4 2014 at 1047 PM

Hi ThahmidHope you are fineYour blog is really helpful for me I learned more from youNow I am planning to design a Transformer-less Inverter using SG3525 in DC-DC and a PIC ndash PWM module for Sine wave production I will be following your example circuit you mentioned with SG3525 for DC-DC conversion but let me know what should be the wire gauge for the DC-DC converter transformer windings to make an inverter of 800W capacity Please help me on thisAlso please suggest isolation for the feedback in the circuit I am afraid of 320V DC come out the inverter thru battery terminals

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90

Hkhurram May 27 2014 at 845 AM

Hi Thahmidi have a power supply (180W DC12V 15A LED Single Output Switching Power Supply) i took this supply from junk yard for some experiment i wound transformer as it is i opened but when i ON this supply is going heat too much but output voltage is ok then i put some load on it on series circuit on main series lamp is ON and output is block all

components is ok FET is 7N60 i want to wind this transformer can u help me supply picture is httpwww4sharedcomdownloadbKbmAVCUcePH_316jpglgfp=1000

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91

Pravin Magiya May 31 2014 at 101 AM

how do you wind this transformer is it 3+3 first and 100 turns or is it the other way

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92


i have an ee42 core but i cant determine the bmax for it can you tell me what is its value

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93

Sohil Suthar June 7 2014 at 841 AM

i want to built power supply of 24Vdc input amp 400Vdc outputis there any reference design you haveplease guide me

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94


Hi tahmid i was designing a ferrite core transformer using push pull topology 60KHzprimary turns-3sec-turns-120 I generated my signal from SG3525 and IR2110I pulled down the gate of the mosfets(IRF3205) with 1k resistor but still i am constantly having the mosfets burnt 5minutes after i connected it to the transformer although i did not implement feedback for now what exactly do think could cause the problem please help me out this mess

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95

yılmaz kemancı July 21 2014 at 141 PM

Tahmid Hi firstly I congratulate you for doing such a nice sharing sg3525 What is the formula of compensation capacitors for example youre using 10nF other examples 220pF 47nF 100nF these values are chosen according to what thanks yılmaz kemancıI love sharing my site httppicsimulatorideexamplewordpresscom

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96

power transformer philippines July 21 2014 at 933 PM

I think you are very expert for transformer ^^

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97


Hello Tahmid good blog sounds lots of work behindIm working on a small inverter 200w push pull bridge can feed 10Amps But with no load i can reach 300-400Vac 60KhzBut I cant keep this voltage when a load is plugged i just can reach 60vac 30W My core is 2+2 primary 60 secondaryCould you tell me what kind of things can be responsible of this loss of power i feed 8A12VDC primary and i can just get merely 30W primary winding is 3X05mmsup2 in parallel Best regards BHFRA

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98

Srini Vasan August 20 2014 at 925 AM

sir I need 12 v to 110v dc converter and prisec winding details and the inductance value of the transformer wattage is 300w

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99

AnonymousSeptember 9 2014 at 739 PM

impresionant dear but now i got a question for you Wich are the best ferrite to get 150W at 3Mhz

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100

AnonymousSeptember 16 2014 at 834 AM

helo deari need to know how can we decide the current carrying capacity of primary and secondaryplease if u dont want to answer let me know i asked u this before but u dont answerejaz abidi

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ahmed elbanna September 17 2014 at 512 PM

hii Tahmid im so proud of your info your so good and helpfull thanks for all of your info 1- i need to know which AWG wire in prim and sec wendings i can use to have output power 1000 watts (same core u used)2- can i turn couple or triple wires together to have higher current in prim turns (3 wires together 3 turns then another 3 for the other 3 turns)3- what to do with the sec turns should i triple the wires as in the prim im still confused because i read all ur comments but didnt find what can help so ill be so happy to know what i can do to get 1000 watt from the same core u used

thanks alot Tahmid )

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102

sigit kurniawan October 12 2014 at 1036 PM

hi tahmid i want to create pontential transformer for voltage measurement with turn ratio of voltage in transformeri choose ferrit core because my objeck have frequency in 40 kHz am i can be used this technique for solving my problems

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103

Kutlu Zungur October 14 2014 at 1032 AM

Thanks in advance for the explanation but why did you divide the fromula by 4Where does this 4 come fromBest regardsKutlu

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104

power transformer philippines October 23 2014 at 709 PM

Thank you for explaining it very well Keep it up

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Path Finder October 27 2014 at 1131 PM

Dear TahmidI am new in SMPS designI want make simple adjustable SMPS labrotory power supply 1-30 volt and max 3 ampere Ebay have very cheap LM2596 or LM2576 Modulesis it possiable a pre simple circuit for working 220 volt AC for this moduleI mean it must cheap and small and suitable but it must without power transformer thanks for reply

Regards

Serhat

Reply

106

Md Abdur Rahman Owahid November 12 2014 at 759 PM

Assala-mu-alaikum vai Ive a question about this article Here you showed 3+3 centre tap primary and 96 turns secondery If I need 3+3 centre tap primary and secondery also with centre tap than which modification required Actually this question comes to see this two articles httphomemadecircuitsandschematicsblogspotcom201209making-200-watt-compact-pwm-inverterhtmlandhttpeasy-electronic-circuitsblogspotcom201405100-watt-compact-ferrite-inverterhtml

Reply

107

omarx646 March 16 2015 at 234 PM

Dear sir nice postI have a doubt about the winding primary formule that gives 32 turns in case 35 36 39 what should I doI need to know what to do with that number before calculate secundary winding

Reply

108


Sir thank you for your tutorial on ferite transformer my question is if a my ferite core transformer core (ETD44) is broken can it be used still if i glue it back together

Reply

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TroubleshooterJuly 24 2015 at 1133 AM

It can work as long as it remains complete after the breakage If you loose even a small portion of the ferrite core your whole inductance values will change and most likely the over-all behavior of your coupled inductor as well

Reply

109

Akshadeep April 5 2015 at 342 PM

Hi I am using a E25207 Ferrite core The primary is 12 turns of 22 SWG The secondary is 320 turns of 36 SWG I would like to get 300-320 volts I am using UC3843 and 50 khz frequency But the output voltage is only 180 voltsWhat needs to be done

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110

jtrao April 7 2015 at 347 PM

Hi Akshadeep What is your input voltage and topology is 180V output is with load do you have feedback controlTirumala Rao

Reply

Replies

1

Akshadeep April 10 2015 at 309 AM

Hi Jtrao Ifyou could provide me your email Id I will email you the schematics

Reply

111

Rodrigo Techi April 8 2015 at 745 AM

hi Tahmid im projecting a high frequency ferrite core but how do i chose the core and what range is acceptable for the Bmax

Reply

112

Zeeshan AhmedApril 20 2015 at 1101 AM

can i use ETD44 Instead of ETD39

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AnonymousJuly 10 2015 at 603 PM

Yes but you must change Ac

Reply

113

Sahadat Jony June 9 2015 at 1231 AM

Dear Tahmid vaiI have to need a calculation of 300W toroidal auto transformerCan u please help me

Reply

114

ursulajudith19 July 2 2015 at 1144 PM

how can I boost the current of a solar power laptop charger circuit using an Sg and a ferrite core transformer

Reply

115


Hi TahmidI need only 20mA to 80V to drive some ledsThe formula is the same or change Vin10^8 remain the same or changePlease answerThank you in advance

Reply

116

parthiban kandasamy July 26 2015 at 329 AM


Reply

117


Hi tahmid your work so great-full I recently planned to develop ups for my home i learned concept ups from your post(MOSFET Switching) and i have doubt in transformer selection but you cleared well One more request is to know about which types of transformer in push-pull stage and output stage as well as its different types and configuration

Reply

118


Hi Tahmid

Good work with you tutoring Your explanations are very will done and easy to understand

I am trying to drive a high power ceramic transducer element using one of the latest TI class D chips It is the TPA3116D2 This chip allows you to set the PWM frequency between 400 kHz and 16 MHz With that in mind The core size should get quite a bit smaller Using the equation in this blog the cross section becomes very small ie 2 cm 2 Any larger a cross section I get 1 turn or less for the primary The TI part will allow PBTL connection providing up to 100 watts output power My problem is making sure the impedance never falls below 16 ohms The baseband signal is 25kHz but the PWM frequency can be greater than 400 kHz The reactance of the ceramic element is tuned out by using a parallel inductor

My question is do you have any suggestions for the core and the kind of material I assume the material should be suitable for operation above 400 kHz I am trying to make the driver amplifier as small as possible and thus I need the smallest core that can handle the power but also present the reflected impedance greater than perhaps 2 ohms

This application is just a variation of a SMPS but at higher frequencies than the 50 kHz circuits posted here

Thanks

Reply

119


Hi TahmidThank you for the detailed explanation of HF transformer calculations But I would like to build LF (low frequency) inverter 1kW using full bridge amp SPWM control signals with app 24kHz to obtain 50Hz 220VAC output The problem is how to calculate the 50Hz transformer (EI iron core) I am going to use 12V battery but the available information I can find concerns LF inverter transformers but with higher input voltages (24V 48V)

The recomendation is- for 48V DC system to use transformer with primary 24-30V

Following that recommendation I can calculate the primary for 12VDC system transformer to be app 6 to 75V

Please if you can to advise me how to calculate the needed transformer (EI or toroidal) It

should maintain 220V all the way from 105-14V DC (the inverter has feedback line which regulates the SPWM duty)

Thanks in advance for support

Reply

120

smithlarry August 14 2015 at 117 AM

Shop 12v Converter Inverter at Dctodcpowercom The 12v inverter basically produces the same type of power that is created by utility companies and generators When we have the confidence on the high quality of our products we could offer very competitive prices at the same time


196 comments

For calculating the required number of primary turns using the formula the parameters or variables that need to be considered are

Vin(nom) ndash Nominal Input Voltage Wersquoll take this as 12V So Vin(nom) = 12 f ndash The operating switching frequency in Hertz Since our switching frequency is 50kHz

f = 50000 Bmax ndash Maximum flux density in Gauss If yoursquore used to using Tesla or milliTesla (T or

mT) for flux density just remember that 1T = 104 Gauss Bmax really depends on the design and the transformer cores being used In my designs I usually take Bmax to be in the range 1300G to 2000G This will be acceptable for most transformer cores In this example letrsquos start with 1500G So Bmax = 1500 Remember that too high a Bmax will cause the transformer to saturate Too low a Bmax will be under utilizing the core

Ac ndash Effective Cross-Sectional Area in cm2 You will get this information from the datasheets of the ferrite cores Ac is also sometimes referred to as Ae For ETD39 the effective cross-sectional area given in the datasheetspecification sheet (Irsquom referring to TDK E141 You can download it from here wwwtdkcojptefe02e141pdf ) the effective cross-sectional area (in the specification sheet itrsquos referred to as Ae but as Irsquove said itrsquos the same thing as Ac) is given as 125mm2 That is equal to 125cm2 So Ac = 125 for ETD39

So now wersquove obtained the values of all required parameters for calculation Npri ndash the number of required primary turns

Vin(nom) = 12 f = 50000 Bmax = 1500 Ac = 125

Plugging these values into the formula

Npri = 32


Vin(nom) = 12 f = 50000 Npri = 3 Ac = 125

Bmax = 1600











Npri = 3

Nsec = N Npri = 321 3 = 963






So NA = 310V 195V =159

Nsec Naux = NA

Naux = Nsec NA = 96 159 = 596



(Vaux + Vd) = Vsec NA = 310V 160 = 19375V








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Hi Tahmid





Thanks

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196 comments


Vin(nom) = 12 f = 50000 Npri = 3 Ac = 125

Bmax = 1600











Npri = 3

Nsec = N Npri = 321 3 = 963






So NA = 310V 195V =159

Nsec Naux = NA

Naux = Nsec NA = 96 159 = 596



(Vaux + Vd) = Vsec NA = 310V 160 = 19375V








196 comments

1




Reply

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310 = 230V RMS

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regards veera

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THANKS BYE

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Hello tahmid



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e65 core ferrite





thanks in advance

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Hi Tahmid





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please help me

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hello tahmid sir



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Dear Tahmid



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Hi Tahmid




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Hi Tahmid





Thanks

Reply

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Reply

120




196 comments







Npri = 3

Nsec = N Npri = 321 3 = 963






So NA = 310V 195V =159

Nsec Naux = NA

Naux = Nsec NA = 96 159 = 596



(Vaux + Vd) = Vsec NA = 310V 160 = 19375V








196 comments

1




Reply

Replies

1


310 = 230V RMS

Reply

2








Reply

3



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4



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Replies

1



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5



Reply

6



regards veera

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THANKS BYE

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Hello tahmid



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Youre welcome


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27





e65 core ferrite





thanks in advance

Reply

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2



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38



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2



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39




Thnks

RegardsHeri

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51




thank you very much

RegardsHeri

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1



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52



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1




explanationhtml

RegardsTahmid

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53




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Hi Tahmid





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please help me

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Reply

69


hello tahmid sir



Reply

70



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Hi


Reply

72



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Dear Tahmid



thanksvasu

Reply

75






Reply

76



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77


Hi Tahmid




Reply

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gracias

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Regards

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Hi Tahmid





Thanks

Reply

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Reply

120




196 comments




So NA = 310V 195V =159

Nsec Naux = NA

Naux = Nsec NA = 96 159 = 596



(Vaux + Vd) = Vsec NA = 310V 160 = 19375V








196 comments

1




Reply

Replies

1


310 = 230V RMS

Reply

2








Reply

3



Reply

4



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Replies

1



Reply

5



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2








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regards veera

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7



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thank you very much

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74


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75






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10



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25



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26



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27





e65 core ferrite





thanks in advance

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28



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hello tahmid sir



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Dear Tahmid



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27





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thank you very much

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70



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74


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75






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76



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80




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81



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82



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25



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51




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Dear Tahmid



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Hi Tahmid




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gracias

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Serhat

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Dear Tahmid



thanksvasu

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Hi Tahmid




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gracias

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Serhat

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Hi Tahmid





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Hi Tahmid




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gracias

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Serhat

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Hi Tahmid





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gracias

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Serhat

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Thanks

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196 comments


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Regards

Serhat

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Hi Tahmid





Thanks

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196 comments

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Serhat

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Hi Tahmid





Thanks

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196 comments

Regards

Serhat

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Thanks

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Hi Tahmid





Thanks

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196 comments


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Hi Tahmid





Thanks

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196 comments

Hi Tahmid





Thanks

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196 comments



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196 comments

ferrite transformer turns calculation for high

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