Automatic temperature and humidity regulation – Motors – Relay
Patent
1987-12-30
1989-06-27
Tanner, Harry B.
Automatic temperature and humidity regulation
Motors
Relay
236 46F, 34 48, 219511, G05D 2300
Patent
active
048421928
ABSTRACT:
A thermostat controlled circuit for a bias heater located adjacent the thermostat connected to a source of alternating electrical power. The control circuit has a manually operated switch for providing a temperature level signal. A triac having a gate terminal and first and second terminals connected in series with the AC power source and the bias heater is provided. A transistor circuit controls the operation of the triac and is connected to the gate of the triac to provide a signal for turning on the triac periodically. The microprocessor supplies an enable signal to the transistor circuit at predetermined time intervals to cause the transistor circuit to activate the triac. The triac turns off at the next zero crossing of the AC line current after the microprocessor has removed the enable signal from the transistor circuit. The point in time of turning on the triac may be synchronous or asynchronous with the AC line current. The bias heater supplies heat to a thermostat in the discharge duct of a clothes dryer which combines with heat supplied by air exiting the clothes dryer and controls the point in time at which the thermostat opens and closes.
REFERENCES:
patent: 4233498 (1980-11-01), Payne et al.
patent: 4270693 (1981-06-01), Hayes
patent: 4404462 (1983-09-01), Murray
patent: 4524908 (1985-06-01), Marshall et al.
patent: 4552304 (1985-11-01), Papazian
Langendonk David P.
Range Michael E.
Tanner Harry B.
Whirlpool Corporation
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