H - Electricity – 05 – B
Patent
H - Electricity
05
B
327/2.5
H05B 6/64 (2006.01) F24C 7/02 (2006.01) F24C 7/08 (2006.01) H05B 6/66 (2006.01) H05B 6/68 (2006.01)
Patent
CA 1299253
- 1 - Abstract: High frequency heating apparatus has a more precise and simpler construction through a digital controlling operation of a momentary power-off detecting function protect semiconductor switching elements from overload on starting. The apparatus uses an inverter circuit as a boost power supply for the high frequency oscillator. Precise measurement of the power-off detection and the operational stop time can be achieved so that the semiconductor switching elements can be protected. Also, isolation between portions for controlling the operation switch and the inverter controlling circuit connected to the commercial power supply is retained, resulting in extremely high safety. Furthermore, as cut-off of the major power supply circuit and the opening and closing detection of the door can be effected by one door switch only, the cost is reduced and the operation is superior. In addition, the opening and closing means of the major power supply circuit is provided in the system controlling portion to improve safety.
558506
Fujii Yasuteru
Kurita Hitoshi
Suenaga Haruo
Takano Teruhisa
Yano Masashi
Kirby Eades Gale Baker
Matsushita Electric Industrial Co. Ltd.
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