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Contemporary HV Rectification
Hi Guys,
I am just about to start on a 2kV supply for a 4CX250 amp. I have a 750VA 1500V transformer and a couple of 15uF 7.5kV caps. In the full wave rectifier department I seem to have a few options: 1) A bridge of Microwave oven rectifiers like the NTE517, 15kV PIV, 550mA avg, 200A peak surge This is by far the simplest and has the same surge capability and 500ma / 1500V is in the same ball park as the 750VA transformer rating. I assume that a small capacitor across each of the 4 devices would be wise -- any suggestions of value. 2) A string of 3 or 4 1N4508 rectifiers, 3-4kV PIV, 3A avg, 200A peak surge The standard topology for this seems to be voltage equalizing resistors across each rectifier along with a transient absorbing cap - maybe 10nF. I am sure I have seen some comments that the resistors may reduce reliability (short of using MELF, most metal film resistors seem to be rated at 300-500v). Are their other easily available higher voltage parts ? Finally a 1500V sine wave has a peak of 2100V, so 3 x 1kV rectifiers is never going to approach the total avalanche voltage, so why bother with the balancing resistors? Sure, the caps have a more balanced voltage across them if the resistors are included... This design involves 12 x (rectifier + resistor + cap) which is starting to take up some PCB space where some well insulated posts are all that is required to support 4 microwave oven rectifiers. All comments appreciated, Thanks, Mark |
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