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Apparatus and systems for common mode voltage-based AC fault detection, verification and/or identification

  • US 7,649,360 B2
  • Filed: 01/18/2008
  • Issued: 01/19/2010
  • Est. Priority Date: 01/18/2008
  • Status: Expired due to Fees
First Claim
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1. A circuit for detecting an AC fault (ACF) caused by a module coupled to a bus of a hybrid/electric power train system, comprising:

  • a common mode voltage detector circuit designed to receive a high-voltage DC input signal, and to generate a common mode AC voltage signal (VCM) biased at approximately zero volts by removing a differential mode voltage component from the high-voltage DC input signal; and

    a magnitude detector coupled to the common mode voltage detector circuit and designed to measure a magnitude of the common mode AC voltage signal (VCM), determine whether a measured magnitude of the common mode AC voltage signal (VCM) is greater than or equal to a fault detection threshold voltage (VTH) and to generate an ACF detection signal when the measured magnitude of the common mode AC voltage signal (VCM) is greater than or equal to the fault detection threshold voltage (VTH).

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