Heater drive circuit for controlling ink temperature in ink jet

Details Heater drive circuit for controlling ink temperature in ink jet Heater drive circuit for controlling ink temperature in ink jet

1984-04-16

1986-01-14

Paschall, M. H.

Electric heating

Heating devices

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

219501, 323281, H05B 102

Patent

active

045647496

ABSTRACT:
A drive circuit for controllably driving a heater which is used for maintaining ink in an ink jet printer at a predetermined temperature. A plurality of power sources are installed in the circuit each for supplying a voltage to the heater. The power sources are selectively connected to the heater by a plurality of output transistors and an error amplifier adapted to control switching actions of the output transistors. Diodes are interposed between the respective transistors and the error amplifier to enhance the linearity of the level of the voltage supplied to the heater.

REFERENCES:
patent: 3901437 (1975-08-01), Harkins
patent: 3999190 (1976-12-01), Brown et al.
patent: 4449032 (1984-05-01), Frerking
patent: 4478181 (1984-10-01), Kikuchi et al.

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