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Re: rectifying nst's



Original poster: "Jim Lux by way of Terry Fritz <twftesla-at-uswest-dot-net>" <jimlux-at-earthlink-dot-net>

You probably don't need that much margin.  If you had a bridge rectifier
with one diode in each leg, and one fails shorted, then it is possible that
a diode will see 2.8 * Vrms across it, hence the recommendation to use 400
PIV diodes on 120V rms.  However, in a long string, it is unlikely that all
the diodes in one leg of a bridge will short simultaneously.  And, for that
matter, "ap note" circuits may have been adapted from some earlier circuit
which worked at a higher voltage, or, the 400V diodes are what the guy had
on the bench when he prototyped, etc.  The price difference between 400V and
200V diodes is insignificant for small quantity prototyping.

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Tuesday, April 03, 2001 7:05 PM
Subject: Re: rectifying nst's


> Original poster: "Luc by way of Terry Fritz <twftesla-at-uswest-dot-net>"
<ludev-at-videotron.ca>
>
> Hi Guy
>
> I note on many circuits they use at least 3.3 time the rms
> voltage for PIV. Ex.: 400 PIV for 120 V rms. If you respect the
> same ratio for 15 KV you need 50 KV PIV. For the the design of my
> mot doubler ps in a special configuration were each leg of the
> bridge see only 1X the tension I use 20 KV PIV for 2 MOT ( 5 KV
> rms ) 4 time.
>
> Luc Benard
>
> Tesla list wrote:
> >