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Heat testing method and system for LED assembly with built-in temperature detection function

A technology of LED components and testing systems, applied in the application of thermometers, single semiconductor device testing, thermometers, etc., can solve problems such as forward voltage drop changes, wavelength shifts, and color temperature changes

Inactive Publication Date: 2015-04-22
SOUTH CHINA NORMAL UNIVERSITY
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  • Abstract
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  • Application Information

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Problems solved by technology

[0006] For a single LED chip, a certain amount of heat will be generated as the operating current increases, which will cause changes in the junction temperature of the LED chip and affect the performance of the LED, such as changes in forward voltage drop, color temperature changes, wavelength shifts, The efficiency of photoelectric conversion becomes low, etc.

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  • Heat testing method and system for LED assembly with built-in temperature detection function
  • Heat testing method and system for LED assembly with built-in temperature detection function
  • Heat testing method and system for LED assembly with built-in temperature detection function

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Embodiment 1

[0122] The steps of the thermal testing method with built-in temperature detection LED components provided by the present invention are as follows: (1) layout optimization of LED components: when LED components are designed, at first by using an improved genetic algorithm for each chip Optimize the position of the component to find a suitable layout to reduce the maximum temperature of the component; (2) Design of built-in thermal sensors: design multiple thermal sensors in the component to detect temperature changes inside the component ; (3) Adaptive adjustment of LED component temperature: design a thermal control circuit in the drive circuit of the LED component to monitor the temperature of the component, when the temperature of the component exceeds the given maximum value, the power supply of the LED will be adjusted Adjusting means reducing the size of the supply current, so that the junction temperature of each chip is reduced, so as to achieve the purpose of reducing ...

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Abstract

The invention discloses a heat testing method and system for an LED assembly with the built-in temperature detection function. According to the heat testing method and system, when the LED multi-chip assembly is designed, a proper layout is found by building a heat balance equation of nodes and optimizing the positions of chips on the assembly with an improved genetic method so that the highest temperature of the assembly can be lowered; meanwhile, a plurality of heat sensors are designed in the assembly and arranged in high-transient-temperature areas in the assembly respectively so that the temperature change conditions inside the assembly can be detected; a driving circuit, connected with the heat sensors and provided with the heat control function, of the LED assembly is designed, when the temperature of the assembly exceeds a given maximum value, power supply of the assembly is adjusted, and the temperature of the assembly can be lowered. By means of the heat testing method and system, the supplied current can be self-adaptively adjusted according to the temperature condition of the assembly, the temperature of the assembly is maintained within a normal range, and therefore serious influences, caused by the excessively high temperature, on LEDs are avoided.

Description

technical field [0001] The invention belongs to the testing field of LED chips, in particular to a thermal testing method and testing system of an LED component with built-in temperature detection. Background technique [0002] Light Emitting Diode (LED) is a very competitive new energy-saving solid-state light source. Since its birth, LEDs have achieved full color and high brightness, and white LEDs have been produced on the basis of blue LEDs and purple LEDs, thus realizing a leap in the history of human lighting. Compared with incandescent lamps and fluorescent lamps, LED has more characteristics and advantages, such as high efficiency, energy saving, environmental protection, long life, small size, etc., and has been widely used in backlight, automotive lighting, special work lighting, general lighting and other fields. application. LED is the most energy-saving and environment-friendly high-quality light source among known light sources. With the further development o...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/26G01K13/00
Inventor 潘中良陈翎
Owner SOUTH CHINA NORMAL UNIVERSITY