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Low cost battery sensing technique

  • US 5,821,730 A
  • Filed: 08/18/1997
  • Issued: 10/13/1998
  • Est. Priority Date: 08/18/1997
  • Status: Expired due to Term
First Claim
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1. A battery sensing circuit which includes a pair of input terminals, a pair of output terminals, and a power supply, the battery sensing circuit comprising;

  • a first feedback loop, coupled between said pair output terminals and said power supply, for use in a first mode of operation when no load is present;

    a second feedback loop, coupled between said pair of output terminals and said power supply, for use in a second mode of operation when a load is present; and

    an indicating circuit coupled to said first and second feedback loops for indicating the presence of a battery in said second mode of operation.

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