Apparatus for controlling ventilation fan

Details Apparatus for controlling ventilation fan Apparatus for controlling ventilation fan

1992-10-14

1994-03-15

Tanner, Harry B.

Automatic temperature and humidity regulation

Ventilator type

Electrically actuated

454256, 454343, 73 3102, B60H 124

Patent

active

052940489

ABSTRACT:
The level of a signal voltage of a sensor circuit 9 which changes depending upon the environmental change is detected by comparing the signal voltage with a reference voltage which is constant for a period of time longer than the period of the signal voltage and is momentarily and stepwise changed between a plurality of values. A change in the signal voltage is determined by a determining circuit 14 for operating a ventilation fan. Accurate detection of the environmental change can be made at an improved response even if a power source voltage for the sensor circuit 9 is so unstable or is pulsated that the signal voltage of the sensor circuit 9 has a changing amplitude.

REFERENCES:
patent: 4930407 (1990-06-01), Holter et al.
patent: 4992965 (1991-02-01), Holter
patent: 5062065 (1991-10-01), Lampe
patent: 5088314 (1992-02-01), Takashi

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