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Fault detector for detecting faults in a DC capacitor circuit

  • US 4,805,063 A
  • Filed: 04/21/1987
  • Issued: 02/14/1989
  • Est. Priority Date: 04/22/1986
  • Status: Expired due to Term
First Claim
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1. A fault detector for detecting faults in a DC capacitor circuit comprising a plurality of parallel-connected capacitor circuits each having a group of series-connected DC capacitors for suppressing voltage pulsation and incorporated into the DC unit of an inverter for converting direct current into alternating current, each of said groups of series-connected capacitors having a junction between the capacitors of the group, which comprises:

  • a comparison means connected to a junctions of the series-connected DC capacitors of said plurality of the parrallel-connected capacitor circuits, to compare potentials at the respective junctions of the respective series-connected DC capacitors of the parallel-connected capacitor circuits to detect a difference between said potentials, said comparison means including means for detecting said difference in potential and the magnitude of said difference.

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