Controlled heating microwave ovens

Details Controlled heating microwave ovens Controlled heating microwave ovens

1978-05-01

1980-04-01

Kozma, Thomas J.

Electric heating

Metal heating

Of cylinders

219 1055R, 219 1055F, 331177R, H05B 906

Patent

active

041963326

ABSTRACT:
A frequency controlled microwave oven having an oven cavity, a frequency agile microwave source for energizing the oven cavity, a detector for detecting the power absorption in a load at various source frequencies within a bandwidth and a control circuit for setting the microwave source at frequencies as determined by the power absorption levels. The frequencies at which the oven cavity is energized are selected by the control system to obtain high efficiency, i.e. low power reflection from the cavity, and to obtain improved heating uniformity by the superimposing of various heating patterns produced by the different operating frequencies.

REFERENCES:
patent: 2143891 (1939-01-01), Lindenblad
patent: 2679595 (1954-05-01), Spencer
patent: 3047818 (1962-07-01), Regis
patent: 3461401 (1969-08-01), Williams
patent: 3784781 (1974-01-01), Foerstner et al.
patent: 4009359 (1977-02-01), Tallmadge et al.
patent: 4035599 (1977-07-01), Kashyap et al.
patent: 4042891 (1977-08-01), Levine
patent: 4049938 (1977-09-01), Ueno
patent: 4115680 (1978-09-01), Moore
Control of Magnetron Frequency Using Digital AFC, Ramanaiah et al., Electro-Technology (India) vol. 19, No. 3, (Sep. 1975).

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