Microwave oven controls

Details Microwave oven controls Microwave oven controls

1975-02-14

1977-01-04

Grimley, Arthur T.

Electric heating

Metal heating

Of cylinders

219 1055M, 317DIG2, 340365C, H05B 906

Patent

active

040015360

ABSTRACT:
A control for a microwave oven is disclosed in which cooking time is set by touching one of a number of touch plates on the oven control panel. An oscillator provides an asymmetric signal to a plurality of level detectors by way of the touch plates and associated circuitry. When a touch plate is touched by an operator, the resulting capacitance to ground acts to integrate the oscillator signal and prevent this signal from dipping below a predetermined minimum threshold level. This condition is sensed by the associated level detector and the timer is set accordingly. The oscillator is then disabled to prevent an accidental touching of one of the touch plates from affecting oven operation. Also disclosed is a power control circuit which switches on power to several magnetrons in a staggered manner to limit surge current.

REFERENCES:
patent: 3694669 (1972-09-01), Witt et al.
patent: 3718924 (1973-02-01), Trubert et al.
patent: 3736445 (1973-05-01), Van Sickle
patent: 3780252 (1973-12-01), Crapuchettes
patent: 3836828 (1974-09-01), Siegel
patent: 3846791 (1974-11-01), Foster
patent: 3852728 (1974-12-01), Flagg, Jr.
patent: 3862354 (1975-01-01), Kawamata et al.
patent: 3866003 (1975-02-01), Fox
patent: 3886539 (1975-05-01), Gould, Jr.

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