# Building a High Voltage Rectifier with a continuous negative output

simulate this circuit – Schematic created using CircuitLab

In the past, I have worked with high voltage projects, but seldom with HV rectifiers. Thus, I was curious how I could build a rectifier that could take 70 kV AC and 10 mA to put out a continuous, negative DC voltage with minimal ripples. The frequency for the input is 60 Hz and is provided by a X-ray transformer that provides adjustable voltage from 0-70 kV AC.

Note on image below: There was not an option for a variable transformer image, so I used a non-center tapped transformer to depict it.

• I corrected the diagram. Basically, the first transformer is a variable transformer for adjusting the voltage from 0-130 VAC. The second one (the one recently added) is the 70 kV AC X-ray transformer. Sorry about that, I was a bit tired at the time of the diagram's drawing. Commented Aug 8, 2018 at 0:35
• a rectifier produces a pulsed putput .... filtering capacitors and a regulator would be needed to produce a DC output Commented Aug 8, 2018 at 0:36
• Certainly, but how could I make the rectifier itself? What ratings would I need on the components? Commented Aug 8, 2018 at 0:39
• Also, I would not be able to use a typical voltage regulator, as the voltage is to be adjusted from 0-70 kV (hence, the purpose of the variac). Commented Aug 8, 2018 at 0:41
• That would appear to leave you with a rectifier and an RLC filter. You will probably have to find the highest blocking voltage diodes you can, and string them in series with carefully chosen parallel resistors to build each of the diodes of the rectifier. Run the output through an RLC filter. You are aware of how potentially dangerous your project is?
– K H
Commented Aug 8, 2018 at 1:24