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PSUs: current-limiting and crowbarring - incompatible?

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October 20th 06, 10:53 PM posted to rec.radio.amateur.homebrew,sci.electronics.design

Tim Shoppa Tim Shoppa is offline

Tim Shoppa is offline

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First recorded activity by RadioBanter: Jul 2006

Posts: 263

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PSUs: current-limiting and crowbarring - incompatible?

wrote:
Hi gang,

Is it not feasible to use a crowbar circuit across a PSU's output if
that PSU has a current-limiting feature? I can imagine a situation
arising where an over-voltage causes the crowbar to close, generating a
short-circuit condition which activates the current limiting. The
output will then be stuck at not enough amps to blow the upstream fuse,
but enough current to smoke the crowbar (which is not designed to be
kept conducting for any length of time of course). Is there some way to
have both over-current and over-voltage protection working together in
harmony?
Thanks.

Look up "Foldback current limiting".

Tim.

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