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Flyback plse Voltage multiplier

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happyfpga

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Hello,

I am looking for some advices on my high voltage design. I am build a flyback typed DC-DC to produce 1500VDC from 15VDC. The output current consumption is very low, <0.1mA. The DC-DC switching controller comes from TI, it is just an oscillator+MOSFET driver, the feedback is a resistor divider, switching freq is 300KHz. To reduce the stress on the MOSFET and easierf for the transformer design, I would like to produce 500V first, then use 3-stage voltage multiplier to get 1500V. Right now, I can get 500V properly with PSPICE, but the whole circuit failed after attaching the multiplier which is consist of fast diodes and capacitor.

Anyone has a similar experience can be shared? I appreciate any advice you can offer.

Thanks!


The schematic is attached.

**broken link removed**
 
Last edited:
you are using diode and capacitors to multiply, but the designed current is very low thus it may take a long time to charge it,
try with very low capacitance, i gues it may solve your problem.

if you post the details of the circuit can be helpfull.
 
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