Humidity detection circuit for electronic heat cooking apparatus

Details Humidity detection circuit for electronic heat cooking apparatus Humidity detection circuit for electronic heat cooking apparatus

1992-12-14

1994-09-06

Wieder, Kenneth A.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

324706, 324721, G01N 2704

Patent

active

053451848

ABSTRACT:
A humidity detection circuit includes a bridge circuit containing temperature sensing elements. The bridge circuit is connected in series to a current limiting resistance, a current controlling element and a power supply. There is a set of resistances arranged in parallel with the current limiting resistor and the bridge circuit. A voltage comparing circuit is operatively connected to the bridge circuit the current limiting resistance and the set of resistances. A control section is provided to detect the potential of a junction between the bridge circuit and the current limiting resistance. Based upon the detector potential, the humidity detection circuit changes resistance value of a resistor in the set to an optimal level so that temperature drift does not occur.

REFERENCES:
patent: 3447075 (1969-05-01), Williams, Jr.
patent: 4072051 (1978-02-01), Peterson
patent: 4216675 (1980-08-01), Nagata et al.
patent: 4282480 (1981-08-01), Fujito et al.
patent: 5189362 (1993-02-01), Doble

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