Electric heating – Heating devices – With power supply and voltage or current regulation or...
Patent
1984-04-18
1986-05-20
Paschall, M. H.
Electric heating
Heating devices
With power supply and voltage or current regulation or...
219501, 219216, 219330, 346106, H05B 102
Patent
active
045903620
ABSTRACT:
A circuit for controllably driving a heater in order to speed up temperature elevation at a buildup stage of a liquid which is to be maintained at a predetermined temperature heated by the heater, particularly ink in an ink jet printer. A voltage developed by doubling an output voltage of an atmospheric temperature sensor by an amplifier is compared with a reference voltage, which is adapted to decide power to be supplied to the heater in the event of a buildup of the ink temperature. A temperature-sensitive element responsive to an atmospheric temperature has a temperature coefficient which is double the temperature coefficient of a temperature-sensitive element responsive to a heater temperature. The output voltages of the two elements are weighted by a same amount and then added together, the summation output being compared with the reference voltage.
REFERENCES:
patent: 4167663 (1979-09-01), Granzow, Jr. et al.
patent: 4459469 (1984-07-01), Ishima
Alexander David G.
Paschall M. H.
Ricoh & Company, Ltd.
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