Heat variation detecting circuit for the microwave oven

Details Heat variation detecting circuit for the microwave oven Heat variation detecting circuit for the microwave oven

1986-12-24

1988-08-23

Tolin, G. P.

Electric heating

Metal heating

Of cylinders

219 1055R, H05B 668

Patent

active

047662794

ABSTRACT:
A heat variation detecting circuit, for use with a heat sensor in a microwave oven, comprises a heat sensor, temperature memorizing registers and control comparators. The temperature sensed by the heat sensor is converted via an A/D converter into a digital signal and is memorized in a present temperature register. A buffer register and a prior temperature register will then compare via at a comparator the present and prior temperatures to give a Reset or Enable signal at the comparator in accordance with coincidence or noncoincidence of the temperatures between the present and the prior temperatures in order to control a temperature error counter. The output of the temperature error counter together with the output of the presetting register controls a comparing unit for producing a signal for control of the Magnetron.

REFERENCES:
patent: 4463238 (1984-07-01), Tanabe
patent: 4584448 (1986-04-01), Tanabe
patent: 4591684 (1986-05-01), Tanabe

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