Heater with duty cycle controller

Details Heater with duty cycle controller Heater with duty cycle controller

1984-10-09

1988-10-11

Paschall, M. H.

Electric heating

Heating devices

With power supply and voltage or current regulation or...

219501, 219494, 323236, H05B 102

Patent

active

047773502

ABSTRACT:
A heater including a sensing device for sensing an ambient temperature, a temperature input device for providing a user selectable input temperature both connected to a first circuit to control the heater. The first control circuit includes positive feedback and negative feedback to electrically define a temperature range. The first circuit provides an on/off time duty cycle output wherein the on to off time of the duty cycle is relative to the relationship between the temperature range and the sensed ambient temperature. A second circuit is connected to receive the duty cycle output from the first circuit and is further connected to an alternating current power source to provide a second output signal during the zero crossing of the alternating current power source and when the duty cycle output is present. A driver circuit is connected to receive this second signal and activates the heater when the second signal is active by providing a third signal to a triac which regulates power to the heater.

REFERENCES:
patent: 4167663 (1979-09-01), Granzow, Jr. et al.
patent: 4243875 (1981-01-01), Chang
patent: 4296312 (1981-10-01), Salem
patent: 4323763 (1982-04-01), Goldsmith
patent: 4467183 (1984-08-01), Ishima
patent: 4506144 (1985-03-01), Hesford et al.

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