>
>Rich Measures wrote:
>>>
......
>>Your position appears to be
>>'not necessary. The p.11-9 Handbook statement goes one step beyond
>>saying not necessary". It says "damaging current". In other words, if
>>the diodes are perfectly matched, equalizers are not necessary. However,
>>if the diodes are not perfectly matched in piv,
>
> AND IF there are too few diodes in the string (a design fault)
> AND IF (in spite of the equalization of inverse voltages) one diode is
> still pushed into breakdown THEN
In the example given the total piv was 291v. The surge was 250v. No
problem occurred without ''equalization''. .
>
>>"damaging current" can be
>>produced by the equalizer itself. .
>
>That's a lot of IFs, so I don't think the case against equalizers is
>totally damning. That's why I stick at "not necessary."
alas
>
>I don't use equalizers in any new power supply, but I do take care to
>use more and better matched diodes - so we agree on that much, Rich.
Indeed, Ian. And do you measure the avalance potential of each unit?
>On the other hand, I won't tear the equalizers out of existing power
>supplies that have proved reliable.
>
If you have 4x as much piv as needed, it should play ok..
>
cheers, Ian
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