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.)
|