Electronic thermostat

Details Electronic thermostat Electronic thermostat

G - Physics

01

K

341/32.61

G01K 7/00 (2006.01)

Patent

CA 1114474

ABSTRACT OF THE DISCLOSURE A thermostat for generating control signals for a furnace, air conditioner, or the like, employs a constant frequency periodic source and an oscillator incorporating 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 gener- ates 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.

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