Re: "induction coil" fault situation?

Helmut Sennewald wrote:

> "N Cook" <diverse8@[EMAIL PROTECTED]
> schrieb im Newsbeitrag 
> news:g83b44$mmu$1@[EMAIL PROTECTED]
> 
>>Scenario:
>>a 300 watt toroidal transformer delivering 50-0-50 volts. If there was a
>>break in the output paths  to load.
>>So say a current of 2 amps was interrupted, would a high DC  voltage , 
>>much
>>higher than mains level, be generated momentarily across the primary ?
>>
> 
> 
> Hello,
> 
> You should be concerned about a high voltage spike and ringing at the 
> secondary
> side when the current will be interupted, because of the stray
inductance.
> This high voltage will stress/damage devices directly connected on the 
> secondary side.
> You will have no problem on the primary side as others already
explained.
> 
> Helmut
> 
> 
I don't want to get into it how ever, if the primary side was being 
supplied via a thyristor type system for example, the primary would
see high voltage at times when the thyristor was in the off state if
proper use of caps to protect them aren't in place.

   In many designs where thyristors are in play, a RC network is
coupled over the thyristor device. I guess the same could hold true
with non thyristor devices like MOS/IGBT/etc...


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