Humidifier

Details Humidifier Humidifier

1984-03-01

1985-10-15

Tanner, Harry B.

Automatic temperature and humidity regulation

Humidity control

236 44E, 733365, G05D 2200

Patent

active

045469164

ABSTRACT:
A humidifier for controlling ambient moisture includes a moisture sensor having a capacitor component and a resistor component which may vary in response to the ambient moisture, a pseudo AC square-wave generator for supplying a square-wave source voltage to the sensor which is the sum of two separate square-wave voltages, and a moisture detector section to which a sensor output voltage and a reference voltage electrically representing an objective moisture value are supplied. When the sensor output voltage reaches the stable potential after the transient phenomenon to be caused by the sensor capacitor component, the moisture detector section compares the stable voltage with the above reference voltage, thereby performing the moisture detection which faithfully corresponds to the sensor resistor component.

REFERENCES:
patent: 4146775 (1979-03-01), Kirchner et al.
patent: 4350286 (1982-09-01), Sutoh et al.
patent: 4419021 (1982-12-01), Terada et al.

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