Thyristor off-time controlled induction heating apparatus by dif

Details Thyristor off-time controlled induction heating apparatus by dif Thyristor off-time controlled induction heating apparatus by dif

1981-06-15

1983-08-02

Reynolds, B.A.

Electric heating

Metal heating

Of cylinders

219 1049R, 363 28, 363 96, 323243, 323288, H05B 608, H05B 612

Patent

active

043968180

ABSTRACT:
An induction heating apparatus including a thyristor adapted to receive power from a power source, a gating control circuit for generating gating pulses for application 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.

REFERENCES:
patent: 3781505 (1973-12-01), Steigerwald
patent: 3886342 (1975-05-01), Peters, Jr.
patent: 4010342 (1977-03-01), Austin
patent: 4115676 (1978-09-01), Higuchi et al.
patent: 4145592 (1979-03-01), Mizukawa et al.
patent: 4156273 (1979-05-01), Sato

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