Short circuit protection

[Beaker]

Hey all,
Have been on the lookout for a schematic kinda like a crowbar circuit but instead of using an SCR and blowing a fuse I want it to pull a relay and disconnect the load.
My fancy lab PSU has this feature and I want to use the circuit in a high current PSU .
Have looked all over the net.
Have had an idea with a shunt resistor and even an opamp but not really sure which way to go.
Anyone got any good tips, ideas or a circuit.
Cheers

[Zig]

Hello Beaker,

do a bit of searching on "fold back current limit"

I know this is not the nature of answer You want and if i were in Your shoes i might get agranoyed with this kind of response.

This is the best i can do with the information You have supplied ( load voltage and current would be a nice start).

[Beaker]

Hey Zig,

All info is good info, will be sure to check it out. Thanks

What I would like the circuit to do is:
When the power supply's output is shorted a relay disconnects the output and stays that way until the short is removed then reconnects the output.

Cheers

[vger]

Sounds interesting.... One problem I see is that using a relay to disconnect the load would not allow the circuit to sense the load current while disconnected. The bench supply I use has adjustable current limit and it's circuit is probably similar to the one here....
http://freecircuitdiagram.com/2008/0...miter-circuit/
It won't shut off the current entirely, but will limit to a set value.

Steve