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Four quadrant motor controller minimizing distortion index

  • US 5,585,708 A
  • Filed: 02/06/1995
  • Issued: 12/17/1996
  • Est. Priority Date: 02/22/1991
  • Status: Expired due to Fees
First Claim
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1. A multiphase AC self-commutated bridge circuit comprising:

  • active switches coupled in a bridge configuration and defining a current path for each phase, wherein the state of each active switch determines the direction of current flowing therethrough;

    current sensor means for sensing currents in each current path;

    means responsive to a reference signal for determining desired currents;

    means for periodically determining a distortion index indicative of errors between the desired and actual currents; and

    means for controlling the active switches to produce currents that minimize the distortion index, wherein the means for controlling the active switches generates signals that are complimentary for each pair of active switches causing one active switch of each pair to switch on and the other active switch of the pair to switch off as appropriate to minimize the distortion index.

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