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PWM rectifier having de-coupled power factor and output current control loops

  • US 6,366,483 B1
  • Filed: 07/24/2000
  • Issued: 04/02/2002
  • Est. Priority Date: 07/24/2000
  • Status: Expired due to Term
First Claim
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1. A rectifier, comprising:

  • a switching bridge for converting alternating current into direct current, said bridge having a line side and a load side, m input filter capacitors, each connected at a terminal thereof to the line side of the bridge, wherein an m-phase a.c. power supply having a per phase system inductance is connectable to the m terminals, m being an integer greater than or equal to one;

    the load side having a smoothing inductor, a load being connectable to the smoothing inductor;

    a switching pattern generator for controlling switches in the switching bridge based on a reference output current;

    a first control loop for determining an active portion of the reference output current based on a desired power level of the load and an m-phase voltage at said terminals; and

    a second control loop for determining a reactive portion of the reference output current based on the m-phase voltage at said terminals, the reactive portion being selected so as to obtain a desired per phase power factor on the power supply.

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