Apparatus and method for limiting leakage to ground current while optimizing output of a power supply adaptable for use with a motion sensor switch

  • US 6,472,853 B2
  • Filed: 08/07/2001
  • Issued: 10/29/2002
  • Est. Priority Date: 06/28/1999
  • Status: Expired due to Term
First Claim
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1. An apparatus for regulating a DC power supply, said DC power supply being adaptable for use with a motion sensor switch and having a power supply input terminal adapted to receive a source AC voltage, at least one power supply output terminal adapted to output at least one DC output voltage, and a ground terminal, said DC power supply generating in response to said source AC voltage a leakage current flowing to said ground terminal, said apparatus comprising:

  • an input terminal, adapted to receive an AC voltage based on said source AC voltage; and

    a regulator, coupled to said input terminal to receive said AC voltage, and being adapted to limit said leakage current to a predetermined magnitude, to maintain said predetermined magnitude of said leakage current substantially constant in response to a variation in said input AC voltage within an AC voltage range, and to output a DC voltage having a magnitude which remains substantially constant in response to variations in said input AC voltage, said power supply outputting said at least one DC output voltage based on said DC voltage.

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