Automatic temperature and humidity regulation – With timing element – Timer other than clock
Patent
1977-03-17
1980-06-10
Wayner, William E.
Automatic temperature and humidity regulation
With timing element
Timer other than clock
165 12, 219492, 3403091, F23N 520, H05B 102
Patent
active
042068720
ABSTRACT:
A thermostat for generating control signals for a furnace, air conditioner, or the like, employs a constant frequency, periodically alternating electrical source and an oscillator incorporating an element having a thermal-sensitive electrical characteristic so the oscillator frequency varies as a function of the ambient temperature. A comparator receives the two outputs and generates a signal representative of the ambient temperature. The stable output is also provided to dividing circuits to generate a signal representative of the time that is used to interrogate a digital memory storing a desired temperature-time program for the thermostat for a repetitive period, such as a week or month. The ambient temperature signal is compared with the desired temperature signal to generate an output control signal. A display provides a read-out of time and temperature and is used along with a keyboard or the like in programming the memory.
REFERENCES:
patent: 3050257 (1962-08-01), Sweger et al.
patent: 3912913 (1975-10-01), Bunting
patent: 3922535 (1975-11-01), Randolph
patent: 3942718 (1976-03-01), Palmieri
patent: 3964677 (1976-06-01), Schalow et al.
patent: 4001557 (1977-01-01), Stephenson
patent: 4071745 (1978-01-01), Hall
patent: 4079366 (1978-03-01), Wong
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