High Negative Voltage Generator Debugging?

Discussion in 'The Projects Forum' started by HarryH, Aug 27, 2015.

  1. HarryH

    Thread Starter New Member

    Nov 13, 2013
    Hi all,

    I am building a simple high-negative-voltage generator, but somehow it doesn't work as expected, hope you all can give me some advice to fix/improve it. My input voltage is 300VAC, 1kHz, and the half-wave voltage multiplier is constructed using 1N4007 diodes and 1000pF, 1000V capacitors. My hope is that I can have an output up to 10kV or more. But somehow, my circuit doesn't work even with only 4 stages, which I expect the output should be an DC of -2.4kV. Mine is about -600kV at stage 4. It's weird, isn' it?

    My 4-stage voltage multiplier model works fine in Circuit Lab (you can view it here). The output of Circuit Lab can be found in my attachment, which is what I expected. But my prototype is not working, I have 4 different output screenshots in the attachment for your reference.

    Let me know what you think.

  2. wayneh


    Sep 9, 2010
    Just a hunch, but suppose it's working perfectly. That means what you are seeing is simply due to losses and leakages, and the load of the DMM. Things that Circuit Lab hasn't been told about.