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System and method for limiting through-lamp ground fault currents in non-isolated electronic ballasts

  • US 6,291,944 B1
  • Filed: 05/05/2000
  • Issued: 09/18/2001
  • Est. Priority Date: 05/05/2000
  • Status: Expired due to Term
First Claim
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1. A ground fault sensor for a non-isolated electronic ballast having a dc power supply coupled to an inverter and a resonant tank circuit coupled to the inverter through a dc blocking capacitor, comprising:

  • a filter circuit having an input terminal in communication with a ballast output terminal that is connected to the resonant tank circuit, the filter circuit operable to attenuate high frequency ac voltage components of a voltage signal at the input terminal to generate a filtered voltage signal; and

    a voltage sensor in communication with the filter circuit and operable to provide a control signal in response to the filtered voltage signal;

    wherein the control signal is indicative of a ground fault.

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