H - Electricity – 05 – B
Patent
H - Electricity
05
B
327/26
H05B 6/06 (2006.01) H02M 7/523 (2006.01)
Patent
CA 1128140
ABSTRACT OF THE DISCLOSURE An induction heating apparatus including a thyristor adapted to receive power from a power source, a gating control circuit for generating gating pulses for appli- cation to the gating control terminal of the thyristor, a commutating circuit which commutates off the thyristor, and a differentiator connected across the anode and cathode terminals of the thyristor to detect the power consumption of an inductively heated cooking ware. The gating control circuit comprises a gating pulse generator and a smoothing circuit for filtering the signal from the differentiator into a d-c signal which is compared with a reference level to detect the deviation of the power consumption from the reference value. The gating pulse generator is responsive to a potential at the anode of the thyristor to initiate timing action to determine the interpulse period or turn-off time of the thyristor and also responsive to the deviation of power consumption to vary the interpulse period.
336052
Kobayashi Takao
Kominami Hideyuki
Mizukawa Takumi
Ogino Yoshio
Matsushita Electric Industrial Co. Ltd.
Robic Robic & Associes/associates
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