LED lighting system and control method

A technology for LED lighting and lighting systems, applied in lighting devices, lighting and heating equipment, electrical components, etc., to solve problems such as unrecognized and leaked

Inactive Publication Date: 2008-11-26
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The change cannot be compensated in a satisfactory manner by the above-mentioned color control system because the system

Method used

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  • LED lighting system and control method
  • LED lighting system and control method

Examples

Experimental program
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Embodiment Construction

[0026] FIG. 1 is a block diagram of a prior art LED lighting system 10 . For example, "Achieving color point stability in RGBmulti-chip LED modules using various color control loops (using multiple color control loops to achieve color point stability in RGB multi-chip LED modules)" mentioned above by P.Deurenberg et al. This type of LED lighting system is disclosed in (Proc. SPIE Vol. 5941, 59410C, September 7, 2005).

[0027] The LED lighting system 10 includes an LED lighting unit 12 which in turn includes: an LED light source 14a comprising LEDs adapted to emit red light; an LED light source 14b comprising LEDs adapted to emit green light LEDs; and an LED light source 14c comprising LEDs adapted to emit blue light. The LEDs are all "conventional" intrinsic LEDs adapted to directly emit (visible) radiation. Each LED light source 14 is connected to a corresponding driver 16 for driving the LED light source. The LED lighting system 10 can produce white light, for example by...

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Abstract

The present invention relates to a light emitting diode (LED) lighting system (10) comprising a plurality of LED light sources for generating a mixed color light, the plurality of LED light sources including at least one LED light source comprising at least one LED adapted to emit light of a first wavelength and a wavelength converter for converting at least a portion of the light emitted from the LED(s) to light of another wavelength, and a control system (33) for individually controlling the flux output of the LED light sources. The control system in turn comprises means for providing feedback of the flux of at least one of the LED light sources, the feedback being based on input from an unfiltered sensor (22) responsive to the actual flux of the individual LED light source, for allowing control of the at least one LED light source in accordance with the feedback, and means for providing first control data based on input from a filtered sensor (36) responsive to the first wavelength flux, for allowing adjustment of at least one LED light source, to compensate for first wavelength leakage of the wavelength converted LED light source(s). The present invention also relates to a system and method for controlling a LED lighting unit.

Description

technical field [0001] The present invention relates to a light emitting diode (LED) lighting system comprising a plurality of LED light sources for generating mixed color light, said plurality of LED light sources comprising at least one LED light source comprising at least one LED light source adapted to An LED emitting light at a first wavelength and a wavelength converter for converting at least a portion of the light emitted from the LED(s) to light at another wavelength. The invention also relates to a control system and method for an LED lighting unit. Background technique [0002] Mixing multiple colored LEDs to obtain a mixed color is a common way to generate white or colored light. The generated light is determined by various factors such as the type of LEDs used, color ratio, driving ratio, mixing ratio, etc. However, when the temperature of the LED increases during operation, its optical properties change: the flux output decreases and the peak wavelength shift...

Claims

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Application Information

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IPC IPC(8): H05B33/08H05B44/00H01L33/00
CPCH05B33/0863H05B33/0866H05B33/0869H05B45/24H05B45/22H05B45/28F21Y2115/10
Inventor P·H·F·多伦伯格C·G·A·霍伦
Owner KONINKLIJKE PHILIPS ELECTRONICS NV
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