Power supply for individual control of power delivered to integr

Details Power supply for individual control of power delivered to integr Power supply for individual control of power delivered to integr

1993-01-21

1994-10-18

Paschall, Mark H.

Electric heating

Heating devices

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

219501, 219508, 219216, 307 38, H05B 102

Patent

active

053570812

ABSTRACT:
A circuit for controlling the power applied to the heater resistor of a thermal inkjet printer printhead wherein the heater resistor is connected to a first source of current. The inventive circuit includes a first transistor having a first terminal connected to the heater resistor, a second terminal connected to a return path for the heater resistor and a simple circuit for maintaining a constant voltage at a third terminal of the transistor. In a particular embodiment, the circuit for maintaining a constant voltage at the third terminal of the transistor includes a diode connected between the second and third terminals and a resistor connected between a second source of current and the third terminal of the transistor. In the illustrative embodiment, the transistor is a bipolar NPN transistor and the anode of the diode is connected to the base terminal thereof. In the best mode, the diode is fabricated by connecting the base and collector terminals of a second transistor fabricated on a substrate with the first transistor. The invention provides a simple, low cost, reliable system for controlling the power applied to the heater resistor of a thermal inkjet printhead which consumes little power.

REFERENCES:
patent: 3308271 (1967-03-01), Hilbiber
patent: 3710913 (1973-01-01), Brennan, Jr. et al.
patent: 4459469 (1984-07-01), Ishima
patent: 4599523 (1986-07-01), Pless et al.
patent: 4662736 (1987-05-01), Taniguchi et al.
patent: 4791311 (1988-12-01), Vig
patent: 5223853 (1993-06-01), Wysocki et al.

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