Power control circuit and electro(photo)graphic apparatus employ

Details Power control circuit and electro(photo)graphic apparatus employ Power control circuit and electro(photo)graphic apparatus employ

1976-08-02

1978-08-22

Albritton, C. L.

Electric heating

Heating devices

Combined with diverse-type art device

219497, 219499, 219501, 219502, 219505, H05B 100, H05B 102

Patent

active

041091345

ABSTRACT:
A circuit for controlling the power transmitted from an a.c. voltage source by a switching element, particularly a triac, connected in series with a power element, e.g. with the heating element of an image fixing device in an electro(photo)graphic copier, is safeguarded against errant operation by the provision of a checking circuit which comprises means for blocking periodically the transmission of power by the switching element under its normal control and means effective in intervals of the interruption of said transmission by the blocking means for detecting whether power is then being transmitted to the power element and, if it then is, producing a corrective control signal.

REFERENCES:
patent: 3327096 (1967-06-01), Bernous
patent: 3373262 (1968-03-01), Howell
patent: 3532855 (1970-10-01), Van Cleave
patent: 3705289 (1972-12-01), Szostak et al.
patent: 3737765 (1973-06-01), Lee et al.
patent: 3907380 (1975-09-01), Flesscher et al.

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