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Auxiliary power conversion for an electric vehicle using high frequency injection into a PWM inverter

  • US 6,262,896 B1
  • Filed: 06/19/2000
  • Issued: 07/17/2001
  • Est. Priority Date: 06/19/2000
  • Status: Expired due to Term
First Claim
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1. An electric power system for an electric vehicle, comprising:

  • an electric drive motor;

    a high voltage bus for supplying operating power to energize said drive motor;

    an inverter including power switching devices and having an inverter output, wherein the inverter is coupled between the high voltage bus and the electric drive motor;

    a controller coupled to the inverter and providing motor control signals and high frequency injection signals to the inverter;

    an auxiliary power unit coupled to said inverter output and having a DC output for supplying a DC operating power, wherein the auxiliary power unit supplies the DC operating power in response to the high frequency injection signals;

    wherein the electric drive motor operates in response to the motor control signals and is substantially unaffected by the high frequency injection signals.

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