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Low voltage, two-level, six-pulse induction motor controller driving a medium-to-high voltage, three-or-more-level AC drive inverter bridge

  • US 7,834,579 B2
  • Filed: 07/31/2003
  • Issued: 11/16/2010
  • Est. Priority Date: 07/31/2002
  • Status: Active Grant
First Claim
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1. A method of controlling a multiple-level inverter bridge with a two-level induction motor controller, the two-level induction motor controller outputting six modulated signals for controlling switching of six switches in a two-level inverter bridge, said method comprising:

  • converting the six modulated signals into N time-coordinated signals, wherein N≧

    12 and N is an integer-multiple of 3;

    controlling N switches of the multiple-level inverter bridge by applying the N time-coordinated signals,wherein the multiple-level inverter bridge comprises three branches, each branch having N/3 switches and producing one phase of a three-phase output of the multiple-level inverter bridge, and never-less-than N/6 of the N/3 switches of a respective branch of the multiple level inverter bridge having a logical-off state.

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