Correlated color temperature and color rendering index self-calibration circuit of LED light source consisting of light of multiple colors

A technology of LED light source and correlated color temperature, applied in the direction of light source, electric light source, electric light circuit layout, etc., can solve complex problems, achieve the effect of eliminating self-calibration errors, easy to use, and improving color rendering quality

Inactive Publication Date: 2010-04-21
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of system is relatively complicated. The special three-color sensor only responds to a specific color. If the type or wavelength of the colored LED used changes, the sensor must be adjusted accordingly.

Method used

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  • Correlated color temperature and color rendering index self-calibration circuit of LED light source consisting of light of multiple colors
  • Correlated color temperature and color rendering index self-calibration circuit of LED light source consisting of light of multiple colors
  • Correlated color temperature and color rendering index self-calibration circuit of LED light source consisting of light of multiple colors

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Such as Figure 4 As shown, a correlated color temperature self-calibration circuit and method of a "white LED+red LED" light source, since the light source contains two kinds of LEDs, white light and red light, the circuit includes two sets of constant current drive circuits 1 and 2, respectively driving white light LEDs and red LEDs can accurately control their luminous flux (or light intensity). The composition of other parts of the circuit is the same as the content of the above invention.

[0036] First of all, as described in the above summary of the invention, the main control calculation circuit establishes a conversion database between the feedback signal of the light sensor and the luminous flux (or light intensity) of the white light, and the luminous flux (or light intensity) emitted by the white light LED can be calculated through the response signal of the light sensor circuit. powerful). The data storage circuit transmits the correlated color temperatur...

Embodiment 2

[0039] A high color rendering maintenance circuit for a "white LED + red LED" light source, the system configuration and adjustment principle are similar to those in Embodiment 1. The difference is that the data storage circuit transmits the color rendering index-red and white light luminous flux (or light intensity) ratio curve data to the main control calculation circuit, and the main control calculation circuit finds out the required red light luminous flux (or light intensity) according to the highest color rendering index point. optimal ratio of light intensity).

[0040] The holding circuit is suitable for all kinds of white LEDs on the market. For white LEDs with different packages and models, you only need to choose a suitable red LED to make a white LED lamp with a high color rendering index, which is convenient for use in Occasions with high requirements for light source color rendering.

Embodiment 3

[0042] Such as Figure 5 As shown, a "white LED + red LED + green LED" light source with adjustable correlated color temperature and high color rendering self-calibration circuit. The above two implementation examples can only self-calibrate the correlated color temperature or color rendering index independently. If it is necessary to self-calibrate the two indicators of correlated color temperature and color rendering index at the same time, it is necessary to add an additional color to the LED light source. Therefore, this implementation example uses three sets of constant current drive circuits 1, 2 and 3 to drive white LEDs, red LEDs and green LEDs respectively, which can maintain high color rendering even when the correlated color temperature is artificially changed.

[0043] The difference from the above two implementation examples is that the data storage circuit transmits the color rendering index-luminous flux (or light intensity) ratio data group and the correlated ...

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PUM

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Abstract

The invention discloses a correlated color temperature and color rendering index self-calibration circuit of an LED light source consisting of light of multiple colors, comprising a data storage circuit, a light sensor circuit, an input circuit and a master control computing circuit, wherein the data storage circuit stores each light color LED light flux forming an LED light source or a light intensity-current curve and correlated color temperature and color rendering index-light flux or light intensity ratio curve and sends the two sets of data to the master control computing circuit; the light sensor circuit is used for sensing light signals of a light source window and sending the light signals to the master control computing circuit; the input circuit is used for setting up correlatedcolor temperature and color rendering indexes and sending the correlated color temperature and color rendering indexes to the master control computing circuit; the master control computing circuit utilizes the two curves to establish an internal database, converts the light signals of the light sensor circuit into light flux or light intensity actually sent out by an LED by the database and sendsout a corresponding control signal to an LED constant current drive circuit according to the set correlated color temperature and color rendering index, thereby enabling the LED of each light color to regulate the light flux or light intensity ratio.

Description

technical field [0001] The invention relates to the field of LED drive and control, and specifically discloses a self-calibration circuit for correlated color temperature and color rendering index of an LED light source composed of multiple light colors. Background technique [0002] LED, or light-emitting diode, is a solid-state semiconductor light-emitting device. Since the appearance of high-power white light LED, because of its high luminous efficiency, good energy-saving effect, no pollution, and long life, it has been praised as the fourth-generation lighting source to replace incandescent lamps and fluorescent lamps, and has received widespread attention. [0003] The core of the LED is the LED chip packaged inside. Generally, the LED chip can only emit monochromatic light of a specific wavelength. Therefore, there are three ways for white LEDs to produce white light: 1. Add yellow phosphor powder (usually YAG phosphor powder) to the blue LED chip, and the blue LED c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02
Inventor 吴昊王钢凌敏捷
Owner SUN YAT SEN UNIV
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