H - Electricity – 05 – B
Patent
H - Electricity
05
B
327/2.5
H05B 6/68 (2006.01) F24C 7/02 (2006.01) F24C 7/08 (2006.01) H05B 6/66 (2006.01)
Patent
CA 1293536
ABSTRACT OF THE DISCLOSURE A high-frequency heating apparatus comprises an inverter including a semiconductor switch and a resonance capacitor, a boosting transformer for supplying a high-voltage power and a heater power to a magnetron an inductance device inserted in the heater circuit of the magnetron, and an inverter control unit for controlling the semiconductor switch. The inverter control unit is controlled by start control means at the start time of the inverter so that the conduction time of the semiconductor switch becomes shorter than that under a normal operating condition and the non-conduction time thereof becomes longer than that under a normal operating condition and so that the switching period of the semiconductor switch becomes substantially an integral multiple of a resonance period of the resonance circuit formed by the resonance capacitor, whereby the operating frequency of the inverter at the time of starting thereof becomes substantially equal to its normal operating frequency.
557190
Bessyo Daisuke
Kusunoki Shigeru
Maehara Naoyoshi
Matsumoto Takahiro
Niwa Takashi
Marks & Clerk
Matsushita Electric Industrial Co. Ltd.
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