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Circuitry for reducing thyristor turn-off times

  • US 3,943,430 A
  • Filed: 06/20/1974
  • Issued: 03/09/1976
  • Est. Priority Date: 06/20/1974
  • Status: Expired due to Term
First Claim
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1. A circuit comprising:

  • a thyristor connected between a power source and a load having the function of blocking voltage in the reverse direction;

    first means connected between the anode and the cathode of the thyristor for applying a reverse voltage to the thyristor;

    second means connected between the gate and the anode of the thyristor for causing a reverse current flow in the gate of the thyristor by the reverse voltage provided by said first means;

    said second means comprising a series circuit of an impedance means and an auxiliary thyristor connected between the gate and the anode of the thyristor, the auxiliary thyristor having a diode characteristic in the reverse direction and being operable in the direction allowing a reverse current to flow in the gate of the thyristor.

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