Electric heating – Metal heating – Of cylinders
Patent
1988-10-18
1990-02-27
Leung, Philip H.
Electric heating
Metal heating
Of cylinders
219 1055E, 219 1055D, H05B 666
Patent
active
049048376
ABSTRACT:
A microwave oven is described suitable for use on transports where DC power is available. The microwave oven employs a first inverter to generate internal AC power that is then used to operate the microwave components other than the magnetron microwave source. The internal AC power is passed with relatively low current through the oven interlocks to activate and drive a power inverter that, through an additional output transformer winding, delivers high voltage power to the magnetron. In a preferred embodiment a relay, that is connected to sense when external AC power is available, causes an automatic switching that decouples the internal AC power from the power inverter to enable conventional operation from external AC line power. When external AC line power is no longer applied, the microwave oven automatically switches to operate from the available DC power.
REFERENCES:
patent: 4471422 (1984-09-01), Hierholzer, Jr.
patent: 4488057 (1984-12-01), Clarke
patent: 4517430 (1985-05-01), Slottag
patent: 4560887 (1985-12-01), Schneider
patent: 4667075 (1987-05-01), Sakurai
patent: 4719326 (1988-01-01), Yoo
patent: 4742442 (1988-05-01), Nilssen
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