System for temperature prioritised colour controlling of a...

Details System for temperature prioritised colour controlling of a... System for temperature prioritised colour controlling of a...

2005-07-18

2010-02-02

Vu, David Hung (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

C315S309000

Reexamination Certificate

active

07656100

ABSTRACT:
The present invention relates to a system (100) for controlling light output of a lighting system. The system (100) comprises a light mixing circuit (116) comprising a plurality of light sources configured to provide a mixed light output (102) and mounted on a heat-sink (202) together with a temperature sensing means and a controller (108) receiving a set-point (110) from a calibration matrix (104) and generating a driving signal (120, 122) for the light mixing circuit (116). The controller (108) comprises a rescale unit (118) configured to measure power of the driving signal (120, 122) and to rescale the driving signal (120, 122) when the power exceeds a predetermined power threshold, and the controller is configured to receive the heat-sink temperature signal (206) and to calculate a junction temperature from the heat-sink temperature signal, and the controller (108) generates the driving signal (120, 122) as a function of the junction temperature.

REFERENCES:
patent: 5783909 (1998-07-01), Hochstein
patent: 6411046 (2002-06-01), Muthu
patent: 2002/0097000 (2002-07-01), Muthu et al.
patent: 2002/0130786 (2002-09-01), Weindorf
patent: 2002/0171373 (2002-11-01), Muthu
patent: 2003/0230991 (2003-12-01), Muthu et al.
patent: 2004/0135524 (2004-07-01), Gunter et al.
patent: 1411751 (2004-04-01), None
patent: 0247438 (2002-06-01), None
patent: 03090206 (2003-10-01), None

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