H - Electricity – 05 – B
Patent
H - Electricity
05
B
327/26
H05B 6/04 (2006.01) H02M 5/27 (2006.01) H05B 6/06 (2006.01)
Patent
CA 1104659
ABSTRACT OF THE DISCLOSURE An induction heating apparatus includes a pair of thyristors inversely parallel connected to receive power from a low frequency energy source, a commutating circuit and a gating control circuit for supplying control pulses to the thyristors to produce a forward halfwave current through the commutating circuit which in return produces a backward commutating current to the thyristors. The gating control circuit includes a pulse transformer having a pair of secondary windings connected to the thyristors and a primary winding responsive to control pulses supplied from a pulse generator to produce a positive gating pulse in each of the secondary windings to drive one of the thyristors into conduction depending on the polarity of the source voltage to produce the forward current. The control pulse has a longer duration than the maximum duration of the forward halfwave current so that upon cessation of the forward current the other thyristor is gated into conduction to allow the backward commutating current to pass therethrough to complete an oscillation cycle. A counterelectromotive force is generated in the secondary windings in response to the trailing edge of the positive gating pulse to negatively bias the thyristor to quickly turn it off.
308141
Hamaoka Shigeo
Kiuchi Mitsuyuki
Matsushita Electric Industrial Company Limited
Robic Robic & Associes/associates
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