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Robust AC chassis fault detection using PWM sideband harmonics

  • US 8,278,934 B2
  • Filed: 02/13/2009
  • Issued: 10/02/2012
  • Est. Priority Date: 02/13/2009
  • Status: Active Grant
First Claim
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1. A method of detecting an AC chassis fault on one or more DC/AC converters having a load, comprising:

  • receiving a chassis voltage VChassis signal from between a DC link voltage and a chassis ground;

    capturing at least one side band harmonic of said chassis voltage VChassis signal;

    determining a peak magnitude value related to said side band harmonic (SBH);

    comparing said peak magnitude value to a predetermined threshold value, wherein if said peak magnitude value equals or exceeds said predetermined threshold value an AC chassis fault condition is detected on said one or more DC/AC converters having the load.

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