Constant current-pulse led drive circuit

Details Constant current-pulse led drive circuit Constant current-pulse led drive circuit

1975-05-02

1977-01-04

Goldberg, Gerald

Electricity: power supply or regulation systems

Remote sensing

307 24, 307 33, 307264, 323 21, 356 41, G05F 120

Patent

active

040016676

ABSTRACT:
A circuit for use with an oximeter system which provides constant current pulses to light-emitting diodes in a sequential and cyclical manner. The circuit maintains magnitudes of pulses in the pulse train equal to certain other pulses in the pulse train over extremes of temperature variation, voltage variation, and time duration. Each diode is energized by a series of pulses having the same magnitude, although pulse magnitudes will vary from diode to diode. Therefore, light output from one light-emitting diode remains proportional to light output from the others.

REFERENCES:
patent: 3471770 (1969-10-01), Haire
patent: 3647299 (1972-03-01), Lavallee
patent: 3675114 (1972-07-01), Nercessian
patent: 3784844 (1974-01-01), McGrogan, Jr.
IBM Tech. Disc. Bull. vol. 11 No. 2, July 1968; p. 110.

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