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Backup power circuit

  • US 4,316,097 A
  • Filed: 12/14/1979
  • Issued: 02/16/1982
  • Est. Priority Date: 12/14/1979
  • Status: Expired due to Term
First Claim
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1. A backup power circuit for automatically energizing a multi-power requirement load upon failure of its primary power source comprising:

  • a direct current source;

    a power loss detection circuit connected to monitor a power parameter of the load, a predetermined change in the power parameter from its normal condition causing the power loss detecting circuit to generate a fault signal;

    solid state timer means responsive to the fault signal, the timer means providing a trigger signal a predetermined time period after the generation of the fault signal, the triggering signal continuing for a predetermined time period subsequent to the termination of the fault signal generation by the power loss detection circuit;

    solid state inverter means connected to the direct current source and responsive to the trigger signal, the inverter means providing an alternating current output during the generation of the trigger signal by the timer means;

    step-up transformer means connected to the alternating current output of the inverter, the transformer means providing alternating current to the load at a voltage exceeding that of the alternating current output of the inverter;

    rectifier means connected to the transformer means, the rectifier means providing direct current to the load at a voltage exceeding that of the direct current source; and

    relay means responsive to operation of the inverter means, the relay means being actuated generally simultaneously with energization of the inverter means to disconnect from the primary power source those portions of the load energized by the current outputs of the transformer and rectifier means.

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