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Variable speed drive

  • US 9,024,559 B2
  • Filed: 05/04/2010
  • Issued: 05/05/2015
  • Est. Priority Date: 05/04/2010
  • Status: Active Grant
First Claim
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1. A converter module for a variable speed drive comprising:

  • a plurality of switching modules, one switching module of the plurality of switching modules comprising a first semiconductor switch connected in anti-parallel or series with a second semiconductor switch, the second semiconductor switch being controllably switched during a precharge operation of the variable speed drive to limit an inrush current into the DC link, and the second semiconductor switch comprising a maximum current rating less than a maximum current rating of the first semiconductor switch;

    wherein the first semiconductor switch is controlled by applying a first voltage, and the second semiconductor switch is controlled by a second voltage greater than the first voltage.

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