System and method for regulating power output in a microwave ove

Details System and method for regulating power output in a microwave ove System and method for regulating power output in a microwave ove

1978-11-30

1980-07-01

Grimley, Arthur T.

Electric heating

Metal heating

Of cylinders

73355R, 219 1055R, 324 58B, H05B 906

Patent

active

042107954

ABSTRACT:
A method and control system for regulating the output power of a magnetron in a microwave oven having a food heating cavity, a magnetron, and a waveguide coupling the magnetron to the heating cavity. The reflection coefficient within the waveguide is measured and a control signal is generated to switch the magnetron between first and second levels of power output when the reflection coefficient reaches a pre-determined value indicating that the food item within the oven has begun to defrost. In the preferred embodiment, the present invention incorporates digital signal processing utilizing a microprocessor to calculate the reflection coefficient and generate the control signal based upon digital signal inputs that are a function of the detected microwave energy within the waveguide.

REFERENCES:
patent: 3233172 (1966-02-01), Ludma
patent: 3541434 (1970-11-01), Mullen
patent: 3704409 (1972-11-01), Oomen
patent: 3875361 (1975-04-01), Fukui et al.
patent: 3999027 (1976-12-01), Moore
patent: 4009359 (1977-02-01), Tallmadge et al.
patent: 4049938 (1977-09-01), Ueno

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