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Soft switched three-phase boost rectifiers and voltage source inverters

  • US 5,633,793 A
  • Filed: 01/23/1995
  • Issued: 05/27/1997
  • Est. Priority Date: 01/23/1995
  • Status: Expired due to Fees
First Claim
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1. A three-phase boost rectifier for converting a three-phase alternating current power supply to a direct current power supply, comprising:

  • a three-phase alternating current power input;

    a switching bridge connected between said alternating power input and a direct current rail output, said switching bridge comprising a plurality of switches each having an anti-parallel diode associated therewith;

    a direct current rail diode connecting said switching bridge and said direct current rail output, said direct current rail diode being faster than said anti-parallel diodes; and

    an auxiliary circuit connected across said switching bridge for achieving zero-voltage-transition, said auxiliary circuit comprising;

    a resonant inductor and an auxiliary diode connected in series across said direct current rail diode; and

    an auxiliary switch having a first pole connected between said resonant inductor and said auxiliary diode and a second pole connected to ground.

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