The basic Cockroft Walton circuit consists of 3 stages of diodes and capacitors creating a voltage of around 1860 from standard AC 220V/50Hz supply.
I tried creating a bug zapper with the same circuit and achieved similar voltage at output and could generate spark on touching positive and negative terminals. The actual requirement is to generate 5000V best case or at least 3000 volts from 220V AC supply without the need of a transformer. Now for this I added 3 more stages to the circuit and measured the voltage with HV probe and it was around 3700V which is decent enough. I am using 0.47uf 800 volt capacitors and 1N4007 1A diodes for this
The moment I short the positive and negative terminals it generates a good spark but when I touch again them the spark starts to fade away and the voltage at the output starts decreasing on every spark. I checked what went wrong found out diodes keep getting damaged. If we go from 3 to 4/5/6... stages, I thought diode has reverse voltage rating of 1000V, so I replaced them with 16kv 5mA HV diode, it couldn't even generate 1860 on 3 stages.
- Why does the diode get damaged if I add one or more stages to below given 3 stage circuit?
- How do I fix it and avoid damaging diodes if I have to use 1N4007 and generate 3000+ volts to be used as a bug zapper?
Ref video link to 1.8k fly/bug zapper: Youtube Link
This is the basic circuit for your reference: