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ENERGY SOURCE ISOLATION AND PROTECTION CIRCUIT FOR AN ELECTRONIC DEVICE

  • US 20100052619A1
  • Filed: 09/04/2008
  • Published: 03/04/2010
  • Est. Priority Date: 09/04/2008
  • Status: Active Grant
First Claim
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1. An energy source isolation and protection circuit for an electronic device, the circuit comprising:

  • a supply voltage rail;

    a reference voltage rail;

    an energy source having a positive terminal, a negative terminal, and an energy source voltage defined between the positive terminal and the negative terminal;

    an electrically controlled switch coupled between the positive terminal and the supply voltage rail; and

    a control circuit coupled to the supply voltage rail, the reference voltage rail, and the electrically controlled switch;

    whereinthe energy source voltage serves as an operating voltage for the control circuit; and

    in response to the energy source voltage dropping below a threshold voltage, the control circuit opens the electrically controlled switch to isolate the energy source, and to remove the energy source voltage from the control circuit.

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