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Re: rectifier stack experts?



Original poster: "Daniel Barrett by way of Terry Fritz <twftesla-at-qwest-dot-net>" <dbarrett1-at-austin.rr-dot-com>

    Not an expert, but I doubt compensation will help. I've blown about 500
1N4007's figuring out that reverse recovery time is very important - rapidly
discharging your filter cap will kill these diode because they take a long
time (milliseconds) to turn off, plenty of time to exceed the 50uA reverse
current rating by about 5 order of magnitude. I have started using
fast-recovery diodes(UF4007, 75nS) in my HV rectifiers and haven't fried one
yet.
db

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Friday, October 18, 2002 6:58 PM
Subject: rectifier stack experts?


> Original poster: "Crow Leader by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<tesla-at-lists.symmetric-dot-net>
>
> Greetings,
>
> Is anybody on this list mega-wise when it comes to designing a compensated
> rectifier stack? I had an amusing failure with 34 out of 40 rectifiers
> shorting out in my last "50kV per leg" bridge rectifier. While the diode
> vendors don't mind selling me more, they suggest looking into making some
> type of C or RC compensated string of diodes, possible even with MOVs, but
> don't really know about how to make one that will work the first time. I
> found one commercial vendor of such items, but it looks like what I want
> will be either $400 or $800 which is more than I'd like to spend on a
> component that sounds so simple, eventhough it may not be.
>
> I wish to rectify 15kV at 60Hz at a few hundred mA for now, but want it to
> handle several amps at the same voltage in the future.
>
> KEN
>
>
>