power labmanual

8/19/2019 Power Labmanual

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V-I CHARACTERISTICS OF SCR

Aim: To conduct suitable experiment to plot V-I characteristics o !i"en SCR and also to

obtain holdin! and latchin! current#Circuit $ia!ram:

Apparatus re%uired:

1. SCR characteristics study unit by Pragna Microdesigns2. SCR-TYN616

3. Patch Chords

&rocedure to ind 'atchin! current and to plot V-I characteristics:

1. Make the connections as shon in the circuit diagra!.

2. "ee# $%& ' $C& and Potentio!eter(R )* at !ini!u! #osition.3. Sitch +N #oer su##,y.

. %dust /0 to so!e a,ue (Say !%*.

. S,o,y ary $%& and note done a,ues o4 $%& and /%.

6. Note don the a,ues o4 ,atching current (/5*.. Continue the e)#eri!ent ti,, $%& a##,ied to its !a)i!u!.

. Re#eat the e)#eri!ent 4or di44erent a,ues o4 /0.7. P,ot $%& $8S /% 4or di44erent a,ues o4 /0.


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&rocedure to ind Holdin! current:

1. 9ring the deice to conduction state.

2. Sitch +:: the 0ate su##,y.3. Start reducing ,oad current by arying R % and $%&.

. +bsere 4or hat a,ue o4 /% the deice goes to b,ocking !ode. This current is ;o,dingcurrent /;.

Tabular Column:

/01


3/27

Aim: To conduct suitable experiment to plot V-I characteristics o !i"en *OSFET#

Circuit $ia!ram:

Apparatus Re%uired:

1. M+S:>T 8/09T characteristic study unit ? Pragna Microdesigns.

2. Patch chords.

&rocedure:

Trans conductance characteristics:

1. Make the connections as shon in the circuit diagra!.2. /nitia,,y "ee# $0S @ $AS at !ini!u! #osition.

3. Sitch +N #oer su##,y.

. %dust $AS to say $.. $ary $0S in ste#s and note don the readings o4 $0S @ /A.

6. Continue the e)#eri!ent ti,, !a)i!u! a,ue o4 $0S is reached.

. Re#eat the e)#eri!ent 4or di44erent a,ues o4 $AS.. P,ot the gra#h o4 /A $8S $0S 4or di44erent a,ues o4 $AS.

Tabular column:

$AS1


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$0S

o,ts

/A

!%

$0S

o,ts

/A

!%

T(pical )raph:

Output Characteristics:

1. Make the connections as shon in the circuit diagra!.

2. /nitia,,y "ee# $0S @ $AS at !ini!u! #osition.

3. Sitch +N #oer su##,y.. %dust $0S to say $.

. $ary $AS in ste#s and note don the readings o4 $AS @ /A.

6. Continue the e)#eri!ent ti,, !a)i!u! a,ue o4 $AS is reached.. Re#eat the e)#eri!ent 4or di44erent a,ues o4 $0S.. P,ot the gra#h o4 /A $8S $AS 4or di44erent a,ues o4 $0S.

Tabular column:


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6/27

Aim: To plot the instantaneous output "olta!e " and the load current i#

Circuit $ia!ram:

&spice Circuit ile:

Output .a"eorm


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SI+)'E &HASE CO+VERTER


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Aim: To plot the instantaneous output "olta!e "o the input current is and the load current

io#

Circuit $ia!ram:

To calculate time dela(:

&spice Circuit ile:


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Output .a"eorm

SI+)'E &HASE F/'' CO+VERTER


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Aim: To plot the instantaneous output "olta!e "o and the load current io#

Circuit $ia!ram:

To calculate time dela(:

&spice Circuit ile:


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Output .a"eorm

SI+)'E &HASE F/'' 0AVE AC VO'TA)E CO+TRO''ER


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&roblem: A sin!le phase ull .a"e ac "olta!e controller is sho.n in i! a# the input "olta!e

has a pea1 "alue o 234"5 3H6# The load inductance ' is 3#7mH5 and the load resistance R

is 8#7 ohm# The dela( an!les are e%uals 94o# The !ate "olta!e are sho.n in i! b# se &spice

;a< &lot the instantaneous output phase Vo and load current Io# and

;b< To calculate the Fourier co-eicients o the input current I5 and the input po.eractor#

Circuit $ia!ram:

Solution:

&spice Circuit ile:


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THREE &HASE ,RI$)E RECTIFIER


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Aim: To plot the instantaneous output "olta!e "o and load current io#

Circuit $ia!ram:

&spice Circuit ile:

Output .a"eorm


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AC VO'TA)E CO+TRO''ER /SI+) TRIAC-$IAC


16/27

Aim: To plot the instantaneous output "olta!e "o and the load current io#

Apparatus re%uired: *odule b( &ra!na *icrodesi!ns# CRO# CRO probe# &atch cords#

Circuit $ia!ram:

&rocedure:

2# *a1e the connections as !i"en in the circuit dia!ram#8# S.itch O+ the main suppl(#=# Var( the irin! an!le potentiometer and obser"e the "ariation in lamp bri!htness and

also note do.n the "olta!e across the lamp load or dierent irin! an!les#># &lot a !raph o irin! an!le "ersus "olta!e#

Tabular column:

:iring

ang,e B

(degrees*

$o,tage

across the

,a!# ,oad


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($o,ts*

0a"eorms:

0a"eorms:


18/27

CO+TRO''E$ H0R A+$ F0R /SI+) RC TRI))ERI+)

Aim: To stud( Controlled H0R and F0R circuit#

;a< Controlled H0R usin! RC tri!!erin!


19/27

Circuit $ia!ram:

&rocedure:

2# Connections are made as sho.n in the circuit dia!ram#

8# Suppl( is s.itched on# ,( "ar(in! 2*? potentiometer in steps irin! an!le is chan!ed#=# At each step the irin! an!le @ "olta!e across load are tabulated#># 0a"eorm across load @ SCR are obser"ed#7# A !raph o load "olta!e "s irin! an!le is plotted#

Tabulations:

S5 N+ :iring ang,e B 5oad o,tage $5

Practica, Theoritica,

Theoretical load "olta!e V' Vm;2BCOS9


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;b< CO+TRO''E$ F0R /SI+) RC TRI))ERI+)

Circuit $ia!ram:


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&rocedure:

2# Connections are made as sho.n in the circuit dia!ram#8# Suppl( is s.itched on# ,( "ar(in! 2*? potentiometer in steps irin! an!le is chan!ed#=# At each step the irin! an!le @ load "olta!e V' are tabulated#

># 0a"eorm across load @ th(ristor are obser"ed#7# A !raph o load "olta!e "s irin! an!le is plotted#

Tabulations:

S5 N+ :iring ang,e B 5oad o,tage $5

Practica, Theoritica,

Theoretical load "olta!e V' Vm;2BCOS9


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THREE &HASE F/'' 0AVE AC VO'TA)E CO+TRO''ER

&roblem: A three-phase ull .a"e ac "olta!e controller is supplied rom a .(e-

connected suppl(# It is sho.n in i! a# the input phase "olta!e has a pea1

"olta!e o 234#D"# 3H6# The load resistance per phase is R8#7 ohm# The dela(

an!le is 93o# the !ate "olta!e are sho.n in i!# /se &spice;a


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;b


24/27

&spice Circuit ile:

STE&&ER *OTOR CO+TRO''ER

Aim: To control the speed o a stepper motor#

Apparatus re%uired: Stepper motor 1it b( &ra!na *icrodesi!ns# CRO# CRO probe# &atch

cords#


25/27

Circuit $ia!ram:

&rocedure:

2# Connect A25A8,2 and ,8 leads o stepper motor to the correspondin! output terminal

points and t.o common terminals to V suppl(#8# S.itch O+ the mains suppl( to the unit# Ater e. seconds R&* blin1s# &ress I+C$EC

1e( to select STE& or R&* ;continuous rotation < mode#=# Ater selectin! R&* STE& mode press SET 1e( to select the mode +e. 2 blin1s# This

corresponds to number o rotation or number o steps># &ress I+C$EC 1e( to select the speed or

7# &ress I+C$EC 1e( to select the direction o rotation and press SET 1e( to select#

+o. F/'' blin1s# This corresponds to ull steps# &ress I+C$EC 1e( to select Hal

step Full step mode and press SET 1e( to select HalFull step mode#

3# +o. the settin! is o"er# &ress R/+STO& 1e( the stepper motor rotates at the set

speed i R&* is selected or it mo"es the number o steps set and stops# A!ain

pressin! R/+STO& 1e( the motor stops i it is in R&* mode or it a!ain mo"es the

number o set steps and stops#


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D# Set the step mode5 2step# FOR0AR$ and Hal step mode# Chec1 the output status

b( 'E$ indication or each step and "eri( .ith the s.itchin! lo!ic se%uence as

!i"en in the truth table#

# Repeat the same or ull step mode# Repeat the same or re"erse direction

S0ITICHI+) 'O)IC SEG/E+CE

For ull step mode For hal step mode

A2

Re

d

A8

,lac

1

,2

,lu

e

,8

)reen

2 2

2 2

2 2

2 2

G2 G8 G= G>

+OTE: To chan!e the direction o rotation read se%uence rom bottom to top

Tabular Column:

Sl +o Fre%uenc(In H6

Time or Fi"eRotations

Time or onerotation ;T2<

R&*

A2

Red

A8

,lac1

,2

,lue

,8

)ree

n 2 2

2

2 2

2

2 2

2

2 2 2


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