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Apparatus and method for turning off BJT used as controlled rectifier

  • US 6,597,592 B2
  • Filed: 10/03/2001
  • Issued: 07/22/2003
  • Est. Priority Date: 10/03/2001
  • Status: Expired due to Fees
First Claim
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1. A controlled rectifier circuit, comprising:

  • a bipolar junction transistor (BJT) configured for use as a controlled rectifier (CR) and having collector, base and emitter electrodes, said base electrode being adapted to receive a turn-on drive command for turning on said CR BJT;

    a first turn-off transistor having a first electrode coupled to the base electrode, a third electrode coupled to the collector electrode, and a second electrode adapted to receive a CR BJT turn-off drive command; and

    a second turn-off transistor having a first electrode coupled to the base electrode, a third electrode coupled to the emitter electrode, and a second electrode adapted to receive a CR BJT turn-off drive command;

    wherein each of said turn-off transistors is configured such that in the absence of a turn-on drive command at said CR BJT and the presence of a turn-off drive command at the respective one of said turn-off transistors to conduct stored charge out of the collector-base junction of said CR BJT.

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