Induction heating apparatus using a pair of inversely parallel c

Details Induction heating apparatus using a pair of inversely parallel c Induction heating apparatus using a pair of inversely parallel c

1976-02-11

1978-02-14

Reynolds, Bruce A.

Electric heating

Metal heating

Of cylinders

55DIG36, 219 1055B, 219 1077, 307252Q, 323 24, 363160, H05B 504

Patent

active

040741010

ABSTRACT:
An induction heating apparatus comprising a pair of inversely parallel-connected gate-controlled switching devices connected to an alternating current source, a resonant circuit including an induction heating coil and a variable frequency gating circuit for firing the switching devices to generate oscillations through the conducting device and the induction heating coil. The switching devices are gated into conduction in succession in a first order during the positive half cycle of the alternating current and in a reversed order during the negative half cycle. A zero crosspoint detector is provided to inhibit gating when the source voltage is near zero crosspoint level and to control the gating frequency in accordance with the instantaneous value of the source voltage to increase the turn-off time of the switching devices for lower input source voltage.

REFERENCES:
patent: 3088453 (1963-05-01), Grahn et al.
patent: 3268794 (1966-08-01), Tanaka
patent: 3538417 (1970-11-01), Nijhof et al.
patent: 3587555 (1971-06-01), Cerola
patent: 3693069 (1972-09-01), Kelley et al.
patent: 3707667 (1972-12-01), Gyugyi
patent: 3735237 (1973-05-01), Derby
patent: 3743919 (1973-07-01), Bingley
patent: 3747301 (1973-07-01), Glover et al.
patent: 3821509 (1974-06-01), Amagami et al.
patent: 3898410 (1975-08-01), Peters
patent: 3925633 (1975-12-01), Partridge
patent: 4002875 (1977-01-01), Kiuchi et al.

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