Method for controlling light-emission of a light-emitting...

Details Method for controlling light-emission of a light-emitting... Method for controlling light-emission of a light-emitting...

Filed on

2008-05-08

Date issued

2009-11-03

Examiner

Vu, David Hung (Department: 2821)

Patent Class

Electric lamp and discharge devices: systems

SubClass

Current and/or voltage regulation

Other Related Categories

C315S307000, C315S309000

Type

Reexamination Certificate

Status

active

Patent number

07612506

Description

ABSTRACT:
A method for controlling light-emission of a light-emitting diode (LED) light source whose heat is dissipated by a thermal module is provided. The method includes following steps: providing a constant current source to drive the LED light source and obtaining a reference voltage correspondingly; monitoring and obtaining a dynamic voltage of the LED light source; and comparing the dynamic voltage with the reference voltage and adjusting a heat-dissipating power of the thermal module in real time to make the dynamic voltage of the LED light source approach the reference voltage. By monitoring the dynamic voltage of the LED light source and adjusting the heat-dissipating power of the thermal module in real time, light power of the LED light source can be maintained.

REFERENCES:
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patent: 6975079 (2005-12-01), Lys et al.
patent: 7132805 (2006-11-01), Young
patent: 7262559 (2007-08-01), Tripathi et al.
patent: 2006/0022614 (2006-02-01), Young
S.C. Bera et al., “Temperature Behavior and Compensation of Light-Emitting Diode”, IEEE Photonics Technology Letters, vol. 17, No. 11, Nov. 2005, pp. 2286-2288.
Y. Xi et al., “Junction-Temperature Measurement in GaN Ultraviolet Light-Emitting Diodes Using Diode Forward Voltage Method”, Applied Physics Letters, vol. 85, No. 12, Sep. 20, 2004, pp. 2163-2165.

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