I have a 1-stage Cockroft-Walton being driven by a step-up transformer. The input to the transformer is a square wave of 200V peak-to-peak at 20 kHz. In TINA simulation, everything works as expected (DC output with a bit of ripple). However, in real life as measured by my scope, Vout contains the expected DC output PLUS a large AC component. Curiously, the RMS of the AC component is virtually equal in magnitude to the DC component! Coincidence? I think not, but I still can't seem to figure out what's going wrong. Is the extra AC signal purely reactive? If so, why is it there at all? Should I just ignore it? I've replaced all the parts - no improvement. Note: the diodes are 100 mA, 20KV devices, not the ones shown. The caps are rated to 30kV.
I'm hoping more experienced minds can help solve this one.
Thanks,
Eric
I'm hoping more experienced minds can help solve this one.
Thanks,
Eric