PWM inverter with long carrier wave insertion

  • US 6,704,212 B2
  • Filed: 08/16/2002
  • Issued: 03/09/2004
  • Est. Priority Date: 01/30/2002
  • Status: Active Grant
First Claim
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1. A method for modulating a pulse width, comprising:

  • converting electric power between a DC and an AC by a power converter;

    modulating the pulse width based on a modulated wave and a carrier wave and supplying gate signals to said power converter;

    detecting a current of the DC; and

    detecting each phase current of the AC based on the detected DC current and the gate signals;

    wherein the carrier cycle of the carrier wave, when the current is to be detected, is set longer than the carrier cycle to be set when no current is to be detected.

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