Method of preventing no-load operation of microwave oven

Details Method of preventing no-load operation of microwave oven Method of preventing no-load operation of microwave oven

1994-12-29

1995-10-17

Leung, Philip H.

Electric heating

Microwave heating

With control system

219707, 219710, H05B 668

Patent

active

054593034

ABSTRACT:
A method of preventing a no-load operation of a microwave oven. If a resistance of a gas sensor is greater than a first predetermined value, a cooking operation is normally performed. An initial signal value sensed by a temperature sensor is compared with a second predetermined value if the resistance of the gas sensor is smaller than or equal to the first predetermined value. If the initial signal value is greater than the second predetermined value, the initial signal value is compared with a signal value sensed by the temperature sensor after the lapse of a predetermined time period. If the initial signal value is greater than the sensed signal value, the cooking operation is normally performed. If the initial signal value is smaller than or equal to the sensed signal value, the present operation is discriminated as the no-load operation and the cooking operation is then stopped. A difference between the initial signal value and the sensed signal value is obtained if the initial signal value is smaller than or equal to the second predetermined value. The cooking operation is normally performed if the obtained value is smaller than or equal to a third predetermined value. If the obtained value is greater than the third predetermined value, the present operation is discriminated as the no-load operation.

REFERENCES:
patent: 3670134 (1972-06-01), Bucksbaum
patent: 4009359 (1977-02-01), Tallmadge et al.
patent: 4584448 (1986-04-01), Tanabe
patent: 4691186 (1987-09-01), Shin et al.
patent: 4814570 (1989-03-01), Takizaki
patent: 4831239 (1989-05-01), Ueda

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