Circuit for precisely measuring the load of cooking food in micr

Details Circuit for precisely measuring the load of cooking food in micr Circuit for precisely measuring the load of cooking food in micr

1993-12-07

1996-11-12

Brown, Brian W.

Weighing scales

Combined

177210R, 219708, G01G 1900, H05B 650

Patent

active

055742610

ABSTRACT:
The invention discloses a circuit for precisely measuring the weight of the cooking food in a microwave oven. The circuit is capable of reducing the variation of the weight-voltage converted value due to the existence of the tray during the measurement of the weight of the cooking stuff. The circuit includes: a piezo-electric sensor for generating a sinusoidal wave each time each of rollers passes the pressing plate of said sensor; a filtering section for shaping the weight-voltage converted sinusoidal wave of said piezo-electric sensor; an amplifying section for amplifying the weight-voltage converted sinusoidal wave output of said filtering section to above the maximum recognizable voltage Vmax of a microprocessor; a rectifying section for charging or discharging the weight-voltage converted sinusoidal wave output of said amplifying section; and a buffer section for supplying to said microprocessor the weight-voltage converted output having a corrected gradient as a result of adding an adder voltage (-V1) as much as the minimum recognizable voltage Vmin of said microprocessor to the weight-voltage converted gradient of said rectifying section.

REFERENCES:
patent: 4117898 (1978-10-01), Moriyama
patent: 4683967 (1987-08-01), Hanatani et al.
patent: 5300736 (1994-04-01), Ehrhardt

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