Electric heating – Heating devices – With power supply and voltage or current regulation or...
Patent
1981-07-21
1984-04-10
Paschall, M. H.
Electric heating
Heating devices
With power supply and voltage or current regulation or...
219501, 219505, 324105, H05B 102
Patent
active
044423446
ABSTRACT:
A microwave oven includes a gas sensor for detecting a cooking condition. The resistance value of the gas sensor varies in response to the concentration of the gas generated from the foodstuff being cooked in the microwave oven. A resistance-to-frequency converter including an astable multivibrator is provided for converting the variation of the resistance value of the gas sensor into a frequency signal. A cooking constant setting circuit is provided for developing a signal of a reference frequency in response to a menu to be conducted. The frequency signal, indicative of the resistance value of the gas sensor, obtained by the resistance-to-frequency converter is compared with the reference frequency to terminate the cooking operation when the frequency signal reaches the reference frequency.
REFERENCES:
patent: 4097723 (1978-06-01), Leitner et al.
patent: 4311895 (1982-01-01), Tanabe
patent: 4320285 (1982-03-01), Koether
Paschall M. H.
Sharp Kabushiki Kaisha
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