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

1 1 2 2 3 3 4 4 5 5 A A B B C C Date: 4 oct 2013 KiCad E.D.A. Rev: 1.4 Size: A4 Id: 1/1 Title: High voltage SMPS File: Pohja.sch Sheet: / Robust Amplification Drawn: Timo Vähälä 1 2 P2 CONN_2 C4 330u 1 2 P1 CONN_2 R1 220k R2 680 D1 SF16 R3 2k2 C2 100p L1 100uH GND 1 TR 2 OUT 3 RES 4 CV 5 THR 6 DIS 7 VCC 8 U1 NE555 C3 100p R6 12k R5 120k R4 56k C 1 B 2 E 3 Q2 BC547A C6 1u 1 2 3 Q1 IRFB18N50K P6 P5 P4 P3 + - + - Input 0,66 A @ 12 Vdc Output 32,5 mA @ 205 Vdc (Output limited to 225 Vdc) P1,P2 Screw terminals R5 C6 nonpol 1uF/50V 7mm*2mm R5 C4 low ESR 330uF/25V 8mm*13mm R5 C5 Wima MKS4 4,7uF/250V R27,5 L1 HM50-100uH Q1 IRFB18N50K U1 NE555 D1 SF16 Resistors 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 voltage if it warms. Board 57mm*35mm C5 4u7/250V

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Page 1: Pohja - JAPOkoti.japo.fi/~tivahal/High Voltage SMPS/High Voltage SMPS.pdf · Title: High voltage SMPS File: Pohja.sch Sheet: / Robust Amplification ... U1 NE555 D1 SF16 Resistors

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

330u

220k

680

SF16

2k2

100p

100uH

TR 2OUT3

CV 5THR6

DIS7

U1NE555

100p

12k

120k

56k

C 1

E 3

Q2 BC547A

IRFB18N50K

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

4u7/250V

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