pohja - japokoti.japo.fi/~tivahal/high voltage smps/high voltage smps.pdf · title: high voltage...

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1

2

2

3

3

4

4

5

5

A A

B B

C C

Date: 4 oct 2013KiCad E.D.A.

Rev: 1.4Size: A4Id: 1/1

Title: High voltage SMPS

File: Pohja.schSheet: /

Robust AmplificationDrawn: Timo Vähälä

1

2

P2

CO

NN

_2

C4

330u

1

2

P1

CO

NN

_2

R1

220k

R2

680

D1

SF16

R3

2k2

C2

100p

L1

100uH

GN

D1

TR 2OUT3

RE

S4

CV 5THR6

DIS7

VC

C8

U1NE555

C3

100p

R6

12k

R5

120k

R4

56k

C 1

B2

E 3

Q2 BC547A

C6

1u

12

3

Q1

IRFB18N50K

P6

P5

P4

P3

+-

+-

Input 0,66 A @ 12 VdcOutput 32,5 mA @ 205 Vdc(Output limited to 225 Vdc)

P1,P2 Screw terminals R5C6 nonpol 1uF/50V 7mm*2mm R5C4 low ESR 330uF/25V 8mm*13mm R5C5 Wima MKS4 4,7uF/250V R27,5L1 HM50-100uHQ1 IRFB18N50KU1 NE555D1 SF16Resistors 0,6W metal-oxide

If voltages are off, check BC547A pinout. Reverse the unit if necessary.Do not expect the device to deliver if EXACT components are not used.Although the efficiency is around 84 %, a coil and a MOSFET willl get warm(They dissipate about 1,3 Watts). You might want to cool a things bit (add a fan).Also the BC547A is sensitive to temperature and tends to lower the output voltageif it warms.

Board 57mm*35mm

C5

4u7/250V