Electronic thermostat having correction for internally generated

Details Electronic thermostat having correction for internally generated Electronic thermostat having correction for internally generated

1992-05-05

1993-04-06

Wayner, William E.

Automatic temperature and humidity regulation

Motors

Electric

361140, G05D 1500

Patent

active

051996375

ABSTRACT:
The apparatus controlling operation of a digital thermostat mounted in an enclosure corrects the internally measured temperature for heat generated within the thermostat enclosure by the switching element controlling operation of the load, typically a HVAC unit. The actual ambient temperature is derived by subtracting from the internal temperature a correction value which follows the fraction of total time the switching element conducts power for the HVAC unit (duty cycle). The duty cycle is preferably multiplied by a scale factor and the difference between the ambient temperature as currently calculated and the internal temperature to form the correction value.

REFERENCES:
patent: 3817453 (1974-06-01), Pinckaers
patent: 4741476 (1988-05-01), Russo et al.
patent: 5002226 (1991-03-01), Nelson

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