Circuit arrangement for the control of a ventilator

Details Circuit arrangement for the control of a ventilator Circuit arrangement for the control of a ventilator

1991-01-31

1991-12-24

Dority, Carroll B.

Stoves and furnaces

Stove hoods

126299R, F24C 1520

Patent

active

050742817

ABSTRACT:
A circuit arrangement for the control of a ventilator, especially for a stream or vapor vent hood which is located above a cooking range, in dependence upon steam or vapor clouds which are drawn towards the ventilator. An ultrasonic transmission path having an ultrasonic transmitter and an ultrasonic receiver is located in front of the ventilator, with a receiving circuit demodulating the signal which appears at the ultrasonic receiver; wherein an evaluating or sample-and-hold circuit evaluates any fluctuations in the input signal encountered over a period of time and which are based on the presence of steam or vapor clouds in the ultrasonic transmitting path, and counts these signals within a time frame, and wherein a comparator circuit compares the result of the count with preset values and, in accordance therewith, activates the ventilator.

REFERENCES:
patent: 3625135 (1971-12-01), Carlson

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