Hi Jose
A single leg in a HV rectifier bridge need half PIV (Peak Inverse Voltage)
and provide two times a rating current compared to a half-wave rectifier
because a bridge has two legs against reverse vulgates and also two legs for
forward current.
1N5408 has 1000V RRV (max repetitive reverse voltage) and 3A average
forward current.
3200 V-DC mean approx. 2285 V-AC rms.
A reverse-voltage on a leg of a diode bridge is around 1600 or 1700 V.
When using 1N5408 two diodes per leg is OK, if super-high reliability
diodes and super air-conditioner have been chosen.
To avoid any failure by temperature or surge voltage choose safety
coefficients of x2 or 3x; use four, five or six diodes per leg.
If you use five 1N5408 diodes per leg, the bridge will provide
10 kV RRV and 6 A average forward current.
If six then 12kV RRV and 6A.
Additionally someone says modern rectifier diodes need NO parallel
capacitors or M-ohm balance resistors -- anyone's opinion?
HNY to all,
de Han JE1BMJ
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