Induction heating apparatus with means for detecting zero crossi

Details Induction heating apparatus with means for detecting zero crossi Induction heating apparatus with means for detecting zero crossi

1978-12-26

1982-03-02

Reynolds, B. A.

Electric heating

Metal heating

Of cylinders

219 1077, 323235, 323241, 363 78, 363160, H05B 608, H05B 612

Patent

active

043179754

ABSTRACT:
Induction heating apparatus using gate-controlled switching devices includes a zero crossing point detector for detecting the occurrence of each zero crossing point of high frequency energization current, and a timing circuit which provides timing action in response to the detected zero crossing point. The timing action is controlled by a power control circuit which detects the level of energy delivered to a load within a range from the inherent turn-off time of the gate-controlled switching devices to a desired value.

REFERENCES:
patent: 3436642 (1969-04-01), Segsworth
patent: 3564394 (1971-02-01), Opal et al.
patent: 3686558 (1972-08-01), Havas et al.
patent: 3921092 (1975-11-01), Schatz
patent: 3978307 (1976-08-01), Amagami et al.
patent: 4063146 (1977-12-01), Oliver
patent: 4074101 (1978-02-01), Kiuchi et al.

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