Electric heating – Metal heating – Of cylinders
Patent
1982-02-11
1983-11-15
Reynolds, B. A.
Electric heating
Metal heating
Of cylinders
219 1055R, 219499, 219492, 323280, 323366, 340588, 340599, 374103, 374149, H05B 668
Patent
active
044157908
ABSTRACT:
Control system for a microwave oven or a combination microwave and convection oven where the on time of a microwave generating system is decreased while convection heater on time may optionally be increased as a food product cooks to a predetermined, desired temperature. A temperature probe inserted in the product senses temperature and connects to a wheatstone bridge. A differential amplifier connects to the wheatstone bridge, an up/down integrator circuit connects to the differential amplifier, and a comparator connects to the integrator and which includes a latch to generate a signal to control a triac for controlling the microwave generating system and to provide a closed loop feedback signal to the temperature probe. The control system starts the oven cooking with substantially one-hundred percent power and, as the desired predetermined temperature is reached, the microwave power level is decreased through the control system. As the microwave power level is decreased, the average power to the convection heater may optionally be increased to speed the browning and crisping of a food product. The control system, through the electrical circuit, converts the temperature differential signal into a microwave generating system level signal. The closed loop feedback signal is generated by the microwave generating system which is controlled by the comparator latch and an NPN transistor controlling the up/down integrator. The control system can be used with any type of microwave oven.
REFERENCES:
patent: 3678247 (1972-07-01), Sawa et al.
patent: 3918636 (1975-11-01), Dawson
patent: 4002882 (1977-01-01), McCutchen
patent: 4117307 (1978-09-01), Iversen et al.
patent: 4217477 (1980-08-01), Matsubara et al.
Diesch Bradford J.
Fritts Rex E.
Clark William R.
Leung Philip H.
Pannone Joseph D.
Raytheon Company
Reynolds B. A.
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