Crowbars are usually a fast shut down to protect from over voltage (like
a shorted regulator transistor). Current limits shut down the supply
when overloaded without shorting it out, they just cut back on the drive
the pass transistors.
73, Jerry, K0CQ
On 1/2/2011 2:31 PM, nl7vl wrote:
>> The question is, how fast does a fuse or circuit breaker have to be
>> to protect the final transistors? It may be better to build an
>> outboard circuit that duplicates the over-current circuit inside the
>> Ten-Tec power supplies. I've tripped the power supply for my Corsair
>> many times without damage.
>
> So what you are getting at is recreating the crowbar circuit to trip
> things just like the AC supplies do? (At least that's what the Century
> 21 does off the top of my head.)
>
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