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Automatic system battery reconnect circuit responsive to insertion of new battery replacement

  • US 5,206,538 A
  • Filed: 04/03/1991
  • Issued: 04/27/1993
  • Est. Priority Date: 04/03/1991
  • Status: Expired due to Term
First Claim
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1. A power system for energizing a load network, comprising:

  • power circuitry for connecting a source of primary power to the load network;

    backup circuitry including a reserve input for accepting a reserve voltage source and coupling it to the load network upon failure of the primary power source; and

    including disconnect circuitry for disconnecting the reserve voltage source from the load network when it becomes discharged below a threshold voltage;

    circuitry for enabling connection of the reserve input to the load network in response to replacement of the reserve voltage source with a substitute reserve voltage source, and including;

    a first semiconductor switch for enabling coupling of the reserve input to the load network,a second semiconductor switch responsive to the operativeness of the primary power source for disabling the first semiconductor switch and responsive to the failure of primary power to allow a voltage of the reserve input to bias the first semiconductor switch into conduction, and timing circuitry operative for disabling the first semiconductor switch after an interval of conduction connecting the reserve input to the load network.

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