Apparatus for controlling ventilation fan
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United States of America Patent
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Mar 15, 1994
Grant Date -
N/A
app pub date -
Oct 14, 1992
filing date -
Oct 18, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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