kindly suggest the design method to make a 150kv rectifier circuit using diodes of 4kV/5A rating connected to a 50kV 100mA 3phase transformer.
<SNIP>

 

a three phase tripler with series connected rectifiers.

 

Thnx for the reply....
but the diodes that are generally available are 4kv /0.25A.
So, will not these diodes post a risk of burning out because of low current capacity.

 

your transformer is only rated for .1 amp. the rectifiers should be ok.

 

alfa, Can they take the reverse voltage, though?

 

Hello,

The highest voltage diode I could find is 16kV:
http://www2.mouser.com/ProductDetai...GAEpiMZZMtbRapU8LlZD1jdO8xCOwycvO%2bMWg/MGxM=

Bertus

 

The best I can do is 13kV in a selenium rectifier. It is about 50 years old so your milage may vary.

 

I have worked on several high voltage supplies. The highest voltage was rated for 60KV. They all used conventional diodes stacked in series. Each diode had small capacitor and a resistor in parallel with it. I don't remember the typical values.

 

I found this old abstract on a rectifier stack built by International Rectifier.

 

kindly suggest the design method to make a 150kv rectifier circuit using diodes of 4kV/5A rating connected to a 50kV 100mA 3phase transformer.

Is this related to the Marx Generator (impulse generator) in your other thread?

 

I found this old abstract on a rectifier stack built by International Rectifier.

Nice, the good old days. When polychlorinated biphenyl (PCBs) transformer fluid was still called "pyranol". Pyranol is now used for a different class of molecules.

 

Interesting. This picture appears right side up on my iPad but not on a PC running Chrome.

 

Interesting. This picture appears right side up on my iPad but not on a PC running Chrome.

I worked all day to figure out how to do that....
(Just joking, photo was taken with my ipad - these things must know the orientation and fix. I was holding it upside down when I took the photo).

 

That's one way to change the polarity of the diode.

 

I have worked on several high voltage supplies. The highest voltage was rated for 60KV. They all used conventional diodes stacked in series. Each diode had small capacitor and a resistor in parallel with it. I don't remember the typical values.

The attachment has real good information...thank u very much for the same..few doubts ive.
1.If the transformer used is single phase, does the deisgn of rectifier changes??
2.what is the criteria for selection of range of resistor to be connected in parallel to diode?
3.for capacitor the voltage range can be selcted by no. of capacitors n total voltage.but what shall be the capacitance of capacitor

 

this is a site with high voltage rectifiers.
http://www.voltagemultipliers.com/start.htm

 

The attachment has real good information...thank u very much for the same..few doubts ive.
1.If the transformer used is single phase, does the deisgn of rectifier changes??
2.what is the criteria for selection of range of resistor to be connected in parallel to diode?
3.for capacitor the voltage range can be selcted by no. of capacitors n total voltage.but what shall be the capacitance of capacitor

1. The design of the rectifier modules would not change. The circuit would.

2. It appears in the abstract that the resistor is between 1M and 500K. The diode specs are unknown. I suspect that the resistor is sized to draw about 10 times the leakage current of the diode.

3. The capacitor voltage should be at least twice that of the diode. The capacitance (I think) should be about ten times that of the junction capacitance of the diode.

 

look up data on design for cokcroft walton voltage multiplyer spelling might be a little off.