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US 6,507,159 B2Granted
Controlling method and system for RGB based LED luminary
AssigneeKoninklijke Philips Electronics N.V.
InventorSubramanian Muthu
Life of this patent
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Abstract
A method and a system for controlling a RBG based LED luminary which tracks the tristimulus values of both feedback and reference whereby the forward currents driving the LED luminary are adjusted in accordance with the errors between the feed tristimulus values and the reference tristimulus values until the errors are zero.
Claims30
A method of controlling an RGB based LED luminary driven by forward currents to produce a mixed light, said method comprising steps of:
- acquiring a difference between feedback tristimulus values representative of said mixed light produced by said LED luminary and reference tristimulus values representative of a desired mixed light;
- and
- in response to said acquiring, adjusting said forward currents to decrease said difference between said feedback tristimulus values and said reference tristimulus values until said difference is zero.
A controlling system for a RGB based LED luminary driven by forward currents to produce a mixed light, comprising:
- a feedback unit for generating feedback tristimulus values representative of said mixed light produced by said luminary;
- and
- a controller for acquiring a difference between said feedback tristimulus values and reference tristimulus values representative of a desired mixed light and for adjusting said forward currents in accordance to said difference so as to decrease said difference to zero.
Dependencies are inferred from the claim text.