High frequency heating apparatus

Details High frequency heating apparatus High frequency heating apparatus

1991-06-17

1994-02-15

Evans, Geoffrey S.

Electric heating

Microwave heating

With control system

219718, 363 19, 363 98, H05B 668

Patent

active

052869385

ABSTRACT:
A high frequency heating apparatus such as microwave ovens includes an inverter circuit having a switching element and converting a commercial ac power supply to a high frequency power supply by controlling "on" and "off" periods of the switching element, a magnetron driven by the inverter circuit, a counter cumulatively counting an operating period of time and a deenergization period of time of the magnetron, and a compensator for compensating an "on" period of the switching element based on a count value of the counter so that an input power to the inverter circuit is rendered constant.

REFERENCES:
patent: 4882666 (1989-11-01), Bruning et al.
patent: 4888461 (1989-12-01), Takano et al.
patent: 4900885 (1990-02-01), Inumada
patent: 4920246 (1990-04-01), Aoki
patent: 4967051 (1990-10-01), Maehara et al.

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