Voltage Multiplier Output Only 75V DC With 11V AC Transformer and 4.7uF 450V Caps

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#1 21661734 11 Apr 2012 15:15

Josh Johnson Josh Johnson

Anonymous
Post #1
21661734 11 Apr 2012 15:15

Greetings,
I'm trying to build a high voltage power supply. I have plugged this into a voltage multiplier I have built using fast recovery diodes and 4.7 uF 450V capacitors and all I can get is 75V DC. The transformer is only producing 11V AC. What is wrong with my design?
Thanks!

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#2 21661735 12 Apr 2012 06:32

Calinoaia Valentin Calinoaia Valentin

Anonymous

Post #2
21661735 12 Apr 2012 06:32

Hi Josh,

From what I can see you have no decoupling capacitor between the transistor and the primary coil of the transformer, and you have an DC component also. The transformer core saturates, and you can no longer transfer all the magnetic field you want.
If the frequency is 50 Hz, there is no need for fast recovery diodes, only for better efficiency, since they have a smaller forward voltage drop.
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#3 21661736 12 Apr 2012 06:45

Samir Guessmi Samir Guessmi

Anonymous

Post #3
21661736 12 Apr 2012 06:45

hi,
as i see, i think your schematic is incomplete, try to use scope to view the waves form.
you havn't need to use fest recovery diode, just take care to reverse voltage (max ratings),
then i don't see capacitors!!!!!!!!!
be care too to the frequency generated by the oscillator (your transformer 50Hz@60Hz).
good luck
#4 21661737 15 Apr 2012 01:02

Steve Lawson Steve Lawson

Anonymous

Post #4
21661737 15 Apr 2012 01:02

Josh and Samir mentioned the rectifiers but it might not be clear that you need to pay attention to the PRV (Peak Reverse Voltage). Make sure it is roughly double the Peak voltage expected (by your specs: 230V [not sure if that is RMS or Peak to Peak]), if RMS, then your peak voltage will be: 325V so I would use a 600V rectifier such as 1N4005.
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Voltage Multiplier Output Only 75V DC With 11V AC Transformer and 4.7uF 450V Caps

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