Electricity: power supply or regulation systems – Self-regulating – Using a three or more terminal semiconductive device as the...
Patent
1989-01-19
1989-09-05
Salce, Patrick R.
Electricity: power supply or regulation systems
Self-regulating
Using a three or more terminal semiconductive device as the...
323316, 323317, 3072966, 346107R, 346108, 354 5, 354 7, G05F 326
Patent
active
048642169
ABSTRACT:
A power supply circuit for an LED print head has a reference current source connected to a printer system reference voltage for providing a second reference voltage for an individual, integrated circuit chip. A plurality of substantially similar field effect transistors have their gates connected to the chip reference voltage for providing substantially similar current to each of a plurality of light emitting diodes. The current is enabled to each such LED by the presence or absence of a data signal. A reference resistor in the reference current source permits adjustment so that each of a plurality of integrated circuit chips can provide substantially similar current to each of a plurality of LED dice, or adjust the current level, if required, to achieve similar light output from each LED.
REFERENCES:
patent: 4270092 (1981-05-01), Christopherson
patent: 4605892 (1986-08-01), Seevinck et al.
patent: 4739246 (1988-04-01), Thomson
patent: 4780730 (1988-10-01), Dodge et al.
patent: 4780731 (1988-10-01), Creutzmann et al.
Paul R. Gray, Robert G. Meyer; Analysis and Design of Analog Integrated Circuits, Second Edition, 1977, 1984, John Wiley & Sons, pp. 736, 737.
Brown Charles A.
Kalata Steven
Reid Donald M.
Thayer Billy E.
Barrett Patrick J.
Hewlett--Packard Company
Salce Patrick R.
Todd Voeltz Emanuel
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