Short Circuit Shut-Down?

Discussion in 'The Projects Forum' started by NM2008, Jun 5, 2008.

  1. NM2008

    Thread Starter Senior Member

    Feb 9, 2008
    135
    0
    Hi,
    Could someone tell me, is there an ic for high current cut-off,
    I need to set up a circuit that once a short occurs a relay would be triggered, a basic safety device.

    So could someone recommend a possible ic or components?
    Thanks in advance,
    NM
     
  2. montech

    New Member

    Jun 5, 2008
    4
    0
    Sure
    You could set up an op amp to monitor a setpoint voltagage to drive a relay to switch on when the setpoint is being exceeded.Whats your power supply?
     
  3. NM2008

    Thread Starter Senior Member

    Feb 9, 2008
    135
    0
    The power supply 12v, will op amp ic's take that?
    Regards NM
     
  4. montech

    New Member

    Jun 5, 2008
    4
    0
    Sure.Just tell me what current you want the circuit to "trip" at and we can plug in some part values.
     
  5. NM2008

    Thread Starter Senior Member

    Feb 9, 2008
    135
    0
    At the moment I would like it to trip at 1amp,
    Thanks
     
  6. Externet

    AAC Fanatic!

    Nov 29, 2005
    758
    57
    Hi.
    To shut down when 'high current' ... 1 Ampere, at 12 Volts

    The shut down part can be either a fuse or a circuit breaker. And energize the relay when that happens ?

    Try

    +12V-----------fuse----------circuit---------ground

    And install a 12V relay in parallel to the fuse.

    Miguel
     
  7. montech

    New Member

    Jun 5, 2008
    4
    0
    Ok 12 @ 1amp.Would you look at the following file.I short give us some ideas.This is a current foldback circuit.It will shut down the supply when
    the trip voltage adjusted by R4.So I think you can see you can adapt very few parts from this to protect your circuit.You could replace the lamp with a relay,etc.Also do you have parts on hand?You can always build this circuit with a simulator to work all the "bugs" out.I like this approcah best cuz if you make a mistake there is no smoke:).One i like is "tina"
    www.tina.com.free. Anyways the idea miguel has will work in a pinch:p
     
  8. montech

    New Member

    Jun 5, 2008
    4
    0
    here it is.
     
  9. NM2008

    Thread Starter Senior Member

    Feb 9, 2008
    135
    0
    Thanks for the help everyone!
    I never thought of using a fuse, overlooked the most simplistic idea!
    There ya go!!

    Anyway, thanks montech for the info on current foldback circuit.

    Much appreciated!
    NM
     
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