Automatic fire detection for a microwave oven

Details Automatic fire detection for a microwave oven Automatic fire detection for a microwave oven

1983-07-07

1985-01-29

Leung, P. H.

Electric heating

Metal heating

Of cylinders

219 1055B, 219 1055R, 340578, 340579, 236 44C, H05B 668

Patent

active

044968175

ABSTRACT:
A method and apparatus for anticipating the occurrence of a fire in the cooking cavity of a microwave oven. The oven is provided with a blower for continuously circulating outside air through the cooking cavity to carry away gases by food loads being heated therein. A sensor responsive to the concentration of gases in the circulating air monitors the gas concentration level and generates an output signal representative thereof. Sensor monitoring circuitry responsive to the sensor output signal is operative to determine the rate of change of the gas concentration level, and a detect a characteristic rate of change indicative of the load being heated closely approaching its combustion point. Upon detection of the characteristic rate of change, power to the oven is turned off and and indication is provided to the user that a combustion condition in the oven cavity is imminent.

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