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Reliable current sensing for inverter-controlled electronic machine

  • US 9,455,653 B1
  • Filed: 03/05/2015
  • Issued: 09/27/2016
  • Est. Priority Date: 03/05/2015
  • Status: Active Grant
First Claim
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1. An electric drive for an electric vehicle with a multi-phase electric machine, comprising:

  • an inverter bridge having inverter switches arranged in a plurality of phase legs;

    an inverter controller for controllably switching the inverter switches;

    first and second phase conductors coupled between respective inverter phase legs and respective phase windings of the electric machine;

    first and second flux cores each having a central passage and a gap, respectively, wherein the first and second phase conductors pass through the central passages of the first and second flux cores, respectively;

    a first plurality of current sensors comprised of a predetermined number of first Hall-effect devices, each of the first Hall-effect devices disposed in the gap of the first flux core to generate respective first current signals;

    a second plurality of current sensors comprised of the predetermined number of second Hall-effect devices, each of the second Hall-effect devices disposed in the gap of the second flux core to generate respective second current signals; and

    a plurality of multi-channel op amp devices for conditioning the current signals and coupling them to an inverter controller, wherein the number of multi-channel op amp devices equals the predetermined number;

    wherein each one of the first Hall-effect devices is connected to a different one of the op amp devices, and wherein each one of the second Hall-effect devices is connected to a different one of the op amp devices, whereby a valid conditioned current signal corresponding to each phase conductor is received by the inverter controller unless there are multiple failures of the Hall-effect devices and the op amp devices.

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