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System for precharging a DC link in a variable speed drive

  • US 7,555,912 B2
  • Filed: 03/07/2005
  • Issued: 07/07/2009
  • Est. Priority Date: 03/01/2005
  • Status: Expired due to Fees
First Claim
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1. A variable speed drive comprising:

  • an inverter module to convert a DC voltage to an AC voltage to power a load;

    a DC link to filter and store energy, the DC link being electrically connected in parallel to the inverter module;

    a converter module to convert an AC voltage from an AC power source to a DC voltage, the converter module being electrically connected in parallel to the DC link, the converter module comprising a plurality of pairs of power switches, wherein each pair of power switches includes a reverse blocking power switch connected in anti-parallel to a silicon carbide controlled rectifier; and

    wherein the converter module is controllable to precharge the DC link.

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