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Metal base cookware induction heating apparatus having improved power control circuit for insuring safe operation

  • US 4,151,387 A
  • Filed: 11/01/1974
  • Issued: 04/24/1979
  • Est. Priority Date: 04/06/1971
  • Status: Expired due to Term
First Claim
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1. An improved power supply circuit and dv/dt control including including in combination, power supply terminal means connected across and supplying a thyristor semiconductor switching device connected in a power supply circuit, a snubbing circuit comprising a series connected resistor and capacitor connected in parallel circuit relationship across the thyristor semiconductor switching device for limiting the rate of rise of reapplied forward voltage across the thyristor semiconductor switching device, circuit means connected to said snubbing circuit for deriving an output dv/dt control signal representative of the rate of rise of reapplied forward voltage across the thyristor semiconductor switching device and means for applying said dv/dt control signal back to control operation of the thyristor semiconductor switching device in a direction to assure safe operation of the power supply circuit within the constraints dictated by the dv/dt characteristics of the thyristor.

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