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Re: [Amps] Equalising resistors with HV diodes

To: bb <bbolin@yadtel.net>
Subject: Re: [Amps] Equalising resistors with HV diodes
From: R.Measures <r@somis.org>
Date: Tue, 21 Sep 2004 00:46:38 -0700
List-post: <mailto:amps@contesting.com>

On Sep 20, 2004, at 10:16 PM, bb wrote:



73,
   Marv  WC6W

P.S. -- Here are two more good references on the topic:

Rca Silicon Power Circuits Manual, SB-50, 1967, pp. 23-26

International Rectifier Superpower High Voltage Rectifier Columns,
SR-370-A, 1960, p. 3

Marv, First I don't have a dog in this pit. But I do have one question. So far all the books you listed where printed before 1967 and things change in almost 40 years. Do you use or have any references newer on this subject?

In past projects and travels I have not had any problems in not using
equalizing resistors as long as you follow the rules.
The one thing that gets me is how big this debate is,  just
like the one you reference 5years ago on this list.
This is as big as tube audio debate.
All I can say is WOW and never post any questions on diodes.

Bennie - I thought it was a excellent question since it helped to promote Thinking about series and parallel circuits -- i.e., mainly that in a parallel circuit the voltages are equal, the currents can be unequal, and in a series circuit the currents can not be other than equal, but the voltages can be different. Thus, a parallel circuit is needed to equalize voltages -- such as is the case with series filter capacitors. For equalizing reverse currents (in diodes for example), a series circuit does the job quite nicely. So what kind of logic is behind adding a parallel circuit ("equalizing resistors") to a perfectly good series circuit where the goal of equalizing currents has already been reached? I would say it's seemingly the specious kind.
- cheerz


Bennie


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Richard L. Measures, AG6K, 805.386.3734. www.somis.org

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