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Circuit Interrupter

Discussion in 'General Electronics Discussion' started by CP3, Jan 8, 2010.

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  1. CP3

    CP3

    1
    0
    Jan 8, 2010
    Hello to everyone..I'm new here and am looking for some help in designing a circuit interrupter. I need something that will automatically open and close a circuit on fixed schedule. 2 seconds open circuit...5 seconds closed circuit ad infinitum. It should be able to handl say 60volt-60amp DC circuits.

    I have seen ones with relays or mercury switches that operate on a timed circuit. There are also ones available that utilize GPS for their timing so that multiple interrupters can be "synchronized" to open and close multiple circuits on the same pattern.

    I would like something small, simple and runs on say a 9volt battery. I'm guessing you could use say a timer chip or something like that and a heat sink and capacitor maybe. But am unsure how to achieve this goal.

    Thank you so much for your input and help.

    CP3

    http://www.mcmiller.com/pulse_generators.aspx

    something like this but with only the interrupter circuit and not all the pulse generator stuff.
     
    Last edited: Jan 8, 2010
  2. Resqueline

    Resqueline

    2,848
    2
    Jul 31, 2009
    If you search for CMOS timer circuit you'll come up with a number of suitable solutions. Many will be based on the popular 555 chip but the use of some of the 4000-series CMOS chips is also feasible.
    You may want to define if you want a fixed frequency (perhaps with variable duty cycle), a fixed on-time, or a fixed off-time. PWM is a term that can be used for any of these. Accuracy & stability is also an issue to consider.

    You'll also want to select a logic-level MOSFET with a TO-220 or TO-247 case with (just) enough voltage capability and as low on-resistance as possible.
    Here are two examples of suitable TO220 transistors from IRF:
    IRLB3036PBF is good for 60V & 270A and has an on-resistance of 2.8mOhm (=10.1W @ 60A)
    IRLB4030PBF is good for 100V & 180A and has an on-resistance of 4.5mOhm (=16.2W @ 60A)
    There are many others available so you may want to consult the supplier of your choice and see what they have.
     
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