Microwave oven popcorn control

Details Microwave oven popcorn control Microwave oven popcorn control

1988-04-14

1989-09-26

Leung, Philip H.

Electric heating

Metal heating

Of cylinders

219 1055B, 219 1055E, 219506, 993237, 340386, 340451, 426241, H05B 668

Patent

active

048702382

ABSTRACT:
A closed-loop control for sensing the completion of popcorn popping in a microwave oven and automatically shutting down the oven. A sensor is acoustically coupled to the microwave oven cavity and provides an electrical signal to an amplifier and filter. The amplified and filtered signal is processed by a pop detector which includes an integrator and shut-down command generator responsive to a decreasing rate of popping to shut the oven off. The integrator provides a pre-pop timer function to maintain the oven on until popping commences. In an alternative embodiment, the peak rate of popping is detected and held and the oven is shut off when the popping rate falls to a predetermined ratio of the peak rate or a predetermined time elapses after the peak rate is detected, whichever first occurs.

REFERENCES:
patent: 3931757 (1976-01-01), Goode
patent: 4381439 (1983-04-01), Miyazawa et al.
patent: 4602147 (1986-07-01), Gell

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