Electric heating – Heating devices – With power supply and voltage or current regulation or...
Patent
1997-11-24
1999-11-16
Paschall, Mark
Electric heating
Heating devices
With power supply and voltage or current regulation or...
219216, 219501, 219505, 323364, H05B 402
Patent
active
059862416
ABSTRACT:
A heater temperature control circuit for controlling a temperature of, for example, a heater incorporated in a laser printer for fixing a toner image on a recording material includes a voltage divider circuit delivering an output voltage divided by a thermistor changing a resistance value thereof in response to temperature changes with generation of heat by a heater and a resistance having a predetermined resistance value, and a heater control circuit comparing the output voltage of the voltage divider circuit with a reference voltage, thereby delivering a control signal for controlling an amount of heat generated by the heater on the basis of results of comparison. The heater temperature control circuit further includes a pulse width modulation circuit capable of changing a duty of an output signal thereof in response to an external instruction signal, and an integrating circuit integrating the output signal delivered from the pulse width modulation circuit, thereby delivering an integrated signal serving as the reference voltage.
REFERENCES:
patent: 5124518 (1992-06-01), Lee
patent: 5412453 (1995-05-01), Matsuo
patent: 5444521 (1995-08-01), Tomoyuki et al.
patent: 5543604 (1996-08-01), Taylor
patent: 5630198 (1997-05-01), Makino
Brother Kogyo Kabushiki Kaisha
Paschall Mark
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