Electric heating – Heating devices – With power supply and voltage or current regulation or...
Patent
1988-06-13
1990-01-16
Paschall, M. H.
Electric heating
Heating devices
With power supply and voltage or current regulation or...
219501, 219505, 219494, 323364, H05B 102
Patent
active
048945200
ABSTRACT:
A circuit for controlling the power dissipated by an electrical resistance coupled to a supply voltage which varies, includes a feedback circuit, coupled to the electrical resistance, for producing a feedback current corresponding to the current flowing through the heater. A correction circuit produces a correction current corresponding to variations in the supply voltage. An integrator receives the correction current and the feedback current and amplifies the error indicated by the correction current and the feedback current. A pulse width modulator receives the amplified error and controls the ON time of a switching device to control the flow of current through the electrical resistance. The flow of current through the electrical resistance is controlled to maintain the power dissipated by the resistance constant.
REFERENCES:
patent: 3553428 (1971-01-01), McGhee
patent: 3956978 (1976-05-01), Borley
patent: 4170932 (1979-10-01), Lalancette
patent: 4340807 (1982-07-01), Raskin et al.
patent: 4495405 (1985-01-01), Foster
patent: 4546239 (1985-10-01), Sugimori
patent: 4594501 (1986-06-01), Culley et al.
Paschall M. H.
Westinghouse Electric Corp.
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