H - Electricity – 05 – B
Patent
H - Electricity
05
B
327/26
H05B 6/06 (2006.01)
Patent
CA 1128139
ABSTRACT OF THE DISCLOSURE An induction heating apparatus includes a DC power source, a transistor for generating a trigger current in response to a base drive pulse applied thereto, and a resonant load circuit including a work coil and a capacitor for generating in response to the trigger current an oscillating resonating current when the switching device is turned off, and which current is passed through a diode connected in inverse parallel relation with the transistor. A current transformer is provided to detect the load current. A low voltage detector senses a nearly zero voltage at the collector of the transistor and triggers a ramp generator to generate a ramp voltage which is compared with a reference voltage to generate a train of base drive pulses for application to the transistor. To control the base drive pulses at a variable duration in accordance with an inductive load, the reference voltage is varied as an inverse function of the sensed load current.
330657
Matsushita Electric Industrial Co. Ltd.
Robic Robic & Associes/associates
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