 30-35kV diodes for full wave bridge rectifier
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Proud Mary
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Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
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GammaRay wrote ...
Thanks. Good advice from all. So, if I series connected three HVM12 (rated at 12kV each) I shouldn't count on their collective specs to be 36kV, but more in the range of 20kV (+/-) ?
I might go as high as two thirds - 24kV - but 20 kV would be better, as it gives a good margin. An inductive load could still bounce a big spike backwards into the diodes.
Some people would put equalizing resistors in parallel with the diodes to accommodate variations in reverse characteristics. Then there is the question of voltage sharing during the reverse recovery phase, which can be managed by a shunt capacitor string across the diodes. Now you have a sharing network, which you can optimise to save power and space.
The fomulae for calculating the values of R and C in a sharing-equalising network around series diodes can be found in this SGS-Thomson Application Note: Series Operation of Fast Rectifiers 
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