Load responsive trigger interval control for induction heating a

Details Load responsive trigger interval control for induction heating a Load responsive trigger interval control for induction heating a

1978-09-19

1980-06-24

Reynolds, B. A.

Electric heating

Metal heating

Of cylinders

219 1049R, 363135, 363 96, 307252M, 307252T, H05B 2504

Patent

active

042096839

ABSTRACT:
An induction heating apparatus of the invention is provided with a pair of inversely parallel connected thyristors which receives power from a low frequency energy source. Depending on the polarity of the source voltage, one of the thyristors is triggered into conduction by a control pulse generated in delayed response to a sensed forward bias potential at its anode for the purpose of supplying a forward current to a commutating circuit which is tuned to a high frequency in the ultrasonic range, whereupon a backward current is generated. The backward current is commutated through the other thyristor to complete a high frequency oscillation. A detector is provided to detect when the magnitude of the backward commutating current reaches a predetermined value for the purpose of terminating the trigger control pulse. The control pulses are supplied simultaneously to both thyristors through a pulse transformer which upon termination of the control pulse generates a counterelectromotive force which negatively biases the thyristor which has been conducting during the first half-cycle of each complete oscillation to reduce its turn-off time.

REFERENCES:
patent: 3820005 (1974-06-01), Steigerwald
patent: 3821509 (1974-06-01), Amagami et al.
patent: 4074101 (1978-02-01), Kiuchi et al.
patent: 4145592 (1979-03-01), Mizukawa et al.

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