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High voltage interlock strategy

  • US 9,026,393 B2
  • Filed: 07/07/2009
  • Issued: 05/05/2015
  • Est. Priority Date: 07/07/2009
  • Status: Active Grant
First Claim
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1. A system for determining a voltage cable connection status, comprising:

  • a permanent magnet synchronous machine (PMSM);

    a power conversion circuit configured to provide power to said PMSM;

    a controller coupled to said power conversion circuit and configured to control said power conversion circuit;

    a three-phase high voltage cable configured to electrically connect said power conversion circuit to said PMSM;

    at least one sensor configured to detect current conducted by said cable;

    a high voltage interlock strategy (HVIS) module configured to determine an operational mode in effect at an electric drive system comprising said PMSM and said power conversion circuit, said operational mode being one among a group comprising a pre-charging mode, a zero current mode and a current-generating mode, receive a feedback current vector characterizing said current detected by said at least one sensor, provide at least one feedback factor by performing a set of operations using at least one components of said received feedback current vector, said set of operations dependent on said operational mode, and use said at least one feedback factor to provide a connectivity status for said cable.

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