Microwave oven detecting the end of a product defrosting cycle

Details Microwave oven detecting the end of a product defrosting cycle Microwave oven detecting the end of a product defrosting cycle

1988-06-02

1989-09-26

Leung, Philip H.

Electric heating

Metal heating

Of cylinders

219 1055F, 374149, 99451, 99325, H05B 668

Patent

active

048702358

ABSTRACT:
A microwave oven includes a microwave source and a defrost detector arranged in the oven cavity in the proximity of a frozen product to be processed, the absorption of microwave energy being distributed between the detector and the product and causing their temperature to rise, the temperature variation of the detector being measured by a measuring element producing a corresponding electrical signal. The oven also includes a computing control device which determines completion of defrosting of the product by computing the values at successive instants of the second derivative of such signal as a function of time. The computing control device controls the oven at the end of the defrosting cycle, which is when the value of such second derivative falls below a predetermined value.

REFERENCES:
patent: 3478187 (1969-11-01), Agdur et al.
patent: 4367388 (1983-01-01), Ishihara et al.
patent: 4434342 (1984-02-01), Schubring
patent: 4626643 (1986-12-01), Minet

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