LED drive for generating constant light output

Details LED drive for generating constant light output LED drive for generating constant light output

2006-03-28

2006-03-28

Tweel, Jr., John (Department: 2636)

Communications: electrical

Visual indication

Using light emitting diodes

C315S159000

Reexamination Certificate

active

07019662

ABSTRACT:
An LED light source drive includes an LED current generating circuit and an LED drive controller. The current generating circuit is operable to receive power from a power source and to generate a dc current that can be used to the drive an LED light source. The drive controller is operable to control the dc current to ensure that the light output of the light source remains approximately constant over its operating lifetime. In one embodiment, the drive controller ensures that the effective light output of the light source remains approximately constant by automatically increasing the dc current in predetermined amounts at predetermined times. In an alternative embodiment, the drive controller includes an LED light sensor that is operable to generate a light signal indicative of the effective light output of the light source and the controller uses this light signal to control the dc current output.

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