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Automatic cut-out device

  • US 4,137,557 A
  • Filed: 02/13/1978
  • Issued: 01/30/1979
  • Est. Priority Date: 05/15/1974
  • Status: Expired due to Term
First Claim
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1. A device to cut out non-essential loads in a generator and battery fed electric plant including, in addition to a circuit of essential loads, also a circuit of at least one non-essential load, said device comprising a voltage responsive means connected across terminals of said battery for opening said circuit of at least one non-essential load whenever voltage at said terminals falls below a pre-set level, said voltage responsive means including an integrated unit having means for developing a constant reference voltage and a differential amplifier;

  • a power transistor, said differential amplifier having its output controllably connected to said power transistor; and

    a normally closed contact relay coupled to said power transistor to be activated thereby whenever the output of said differential amplifier exceeds a pre-adjustable critical level, said output being proportional to the difference between the battery voltage and said constant reference voltage.

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