Induction heating apparatus with protective circuit arrangement

Details Induction heating apparatus with protective circuit arrangement Induction heating apparatus with protective circuit arrangement

1975-05-22

1977-04-05

Reynolds, Bruce A.

Electric heating

Metal heating

Of cylinders

219 1077, 321 14, H05B 504

Patent

active

040163903

ABSTRACT:
An induction heating apparatus is provided with protective circuit arrangements which ensure against surge currents caused by inappropriately timed gating-on of a gate controlled rectifier or by erroneous use of a load material such as non-magnetic or ferromagnetic material. The timed gating of the gate-controlled rectifier is accomplished by means of a delay circuit which serves to count timing after a rectified excitation potential drops to the zero voltage point. A coincidence circuit is provided to detect coincidence of two signals, one is a pulse having a predetermined width and the other is a signal derived when the periodic cycle of the energization currents departs from the predetermined cycle period.

REFERENCES:
patent: 3775577 (1973-11-01), Peters
patent: 3821509 (1974-06-01), Amagami et al.

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