Re: Diode strings - equalizing resistors

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Original poster: "Shaun Epp" <scepp-at-shaw.ca> 

Oops,  I should correct what I posted.

Each leg of a full wave bridge sees Vpeak of the transformer output, not 
each diode.  Iif anyone what to know, the resistor values I was using was 
4.7 Mohms  1/2 watt across each diode.  The variations of the reverse bias 
resistance if I remember was between 70 Mohms and around 20 or 30 
Mohms.  so equalization was necessary.  Newer diodes maybe better but I 
haven't tested them.

Shaun Epp

----- Original Message ----- From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Tuesday, September 21, 2004 8:59 AM
Subject: Re: Diode strings - equalizing resistors


>Original poster: biomed-at-miseri.winnipeg.mb.ca
>
>Well I did this with a batch of 1N5408 diodes, 1000PIV 3 amp rating about 8
>years ago.  I used 4 diodes in each leg of a full wave bridge with
>equalizing resistors to use on 3kv (I should have used more diodes for
>surges and variations).  The resistors were required because the reverse
>leakage was different on each diode.  I used the nS (nano siemens) range to
>measure the reverse resistance of each diode and grouped the close ones to
>use on each leg of the FW bridge.  In a full wave bridge each diode sees
>Vpeak of the transformer.
>
>Shaun Epp