High frequency heating apparatus using inverter-type power suppl

Details High frequency heating apparatus using inverter-type power suppl High frequency heating apparatus using inverter-type power suppl

1990-05-22

1992-02-25

Pellinen, A. D.

Electric heating

Metal heating

Of cylinders

H05B 668

Patent

active

050916173

ABSTRACT:
A high-frequency heating apparatus comprises an inverter including a semiconductor switch and a resonance capacitor, a boosting transformer for a supplying high-voltage power and heater 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 a start control 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.

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