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Methods and apparatus to facilitate ground fault detection with a single coil

  • US 7,834,636 B2
  • Filed: 10/24/2007
  • Issued: 11/16/2010
  • Est. Priority Date: 11/02/2006
  • Status: Active Grant
First Claim
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1. A ground fault detection device comprising:

  • an input for a power line comprising a line conductor and a neutral conductor;

    a sense coil to detect current in the line conductor and the neutral conductor, the sense coil comprising a primary winding and a secondary winding;

    a first capacitor in parallel with the secondary winding; and

    a virtual inductor to form a resonance circuit having a resonance frequency and having a signal proportional to the current, the signal indicative of a ground fault condition.

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