Electric heating – Metal heating – Of cylinders
Patent
1980-07-21
1981-11-10
Shaw, C. C.
Electric heating
Metal heating
Of cylinders
361 6, H05B 666
Patent
active
043000320
ABSTRACT:
In an output control apparatus for a microwave oven, it is known to insert a control switch in the primary side of a power transformer of a magnetron. In this invention, the control switch is provided in the secondary side of the power transformer either in a magnetron circuit or in a rectifier circuit. The actuation of the control switch is controlled by an on-off control signal such that the control switch is opened and closed respectively within zero-current time periods, of a half-wave current which flows through the rectifier or the magnetron. A transient rush current to the transformer is reduced and reliable intermittent operation of the magnetron is assured.
REFERENCES:
patent: 3560796 (1971-02-01), Landis
patent: 3939319 (1976-02-01), Tamano et al.
patent: 4017702 (1977-04-01), Harmon et al.
Abe Ikuzo
Niu Tokihide
Shigematsu Koichi
Yuuzu Takayoshi
Matsushita Electric - Industrial Co., Ltd.
Shaw C. C.
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