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Ground fault detection system

  • US 6,678,132 B1
  • Filed: 09/06/2002
  • Issued: 01/13/2004
  • Est. Priority Date: 09/06/2002
  • Status: Active Grant
First Claim
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1. A fault detection system for detecting an unwanted electrical path between a reference potential and at least one of:

  • a) a floating power source, b) a first power conductor coupled to a first terminal of the power source, and c) a second power conductor coupled to a second terminal of the power source, the system comprising;

    an impedance network electrically coupled to the first and second power conductors and having an output terminal for providing a first voltage signal with respect to the reference potential, an amplifier circuit responsive to the first voltage signal and to a reference voltage for generating an amplified signal indicative of the existence of the unwanted electrical path when the difference between the first voltage signal and the reference voltage exceeds a predetermined value, a compensating circuit having an input path for coupling to the amplified signal, and output paths for coupling to the first and second power conductors, for providing a compensating signal to at least one of the first and second power conductors for reducing the difference between the first voltage signal and the reference voltage.

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