IGBT-controlled thyristor AC/DC converter

  • US 6,108,223 A
  • Filed: 10/26/1999
  • Issued: 08/22/2000
  • Est. Priority Date: 10/26/1999
  • Status: Expired due to Fees
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First Claim
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1. A three-phase AC/DC regenerative converter, comprising:

  • a six-diode bridge having three nodes, each connected through a corresponding input inductor to a corresponding line of a three-phase AC main; and

    a capacitor bank connected by a positive rail and a negative rail across said diode bridge for developing a DC voltage across said rails for application to a load;

    characterized by the improvement comprising;

    a six-thyristor bridge having three nodes, each connected through a corresponding one of said input inductors to a corresponding one of said lines, said thyristors poled for conduction with said AC mains in a direction opposite to that of said diodes;

    each side of said thyristor bridge connected to a corresponding one of said rails through a current limiting inductor and an IGBT having a reverse diode in parallel with it, said IGBTs poled for conduction with said AC mains in the same direction as said thyristors;

    a pair of thyristor turn-off circuits, each connected from a node between one of said IGBTs and a corresponding one of said limiting inductors to one of said rails other than the rail to which the corresponding IGBT is connected, each responsive to turn-off of the corresponding IGBT for reverse-biasing a thyristor conducting current through the corresponding limiting inductor; and

    a gate drive controller responsive to the voltage of each of said lines and to the current flowing in each of said lines for providing turn-on signals to said thyristors and conduction signals to said IGBTs so as to selectively conduct current through said thyristor bridge and said IGBTs in a manner to cause the current in said lines to more nearly approximate sinusoidal current.

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