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LED service life prediction method under actual operation environment

A technology of actual operation and life prediction, applied in the direction of lamps and lanterns testing, etc., can solve the problems of ignoring the life difference of samples, unable to read reliability information, etc., and achieve the effect of guiding LED heat dissipation and system design, improving life and reliability

Inactive Publication Date: 2017-02-15
SOUTHEAST UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to address the shortcomings of the above-mentioned background technology and provide a LED life prediction method based on the actual operating environment, especially related to a method of actually predicting a certain proportion of LED failures under various confidence levels or confidence intervals under changing working environments The method of the required time realizes the LED life prediction under the changing working environment, and solves the technical problem that the average data is used to predict the LED life and ignores the life difference between samples, which leads to the inability to read the reliability information.

Method used

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  • LED service life prediction method under actual operation environment
  • LED service life prediction method under actual operation environment

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Embodiment Construction

[0053] The technical solution of the invention will be described in detail below in conjunction with the accompanying drawings.

[0054] The experiment selects Luxeon K2 white light LED from Lumileds Company. Three sets of different driving current and junction temperature conditions were selected from its IES LM-80 report data (I F ,T J ) under the output luminous flux data, select L p Life standard, get three groups of different drive current I F and junction temperature T J L under condition p data such as figure 1 , figure 2 , image 3 shown. make L p The data obeyed the Weibull distribution, and the least square method was used for linear fitting to obtain three different Weibull curves. Different environmental stress (I F ,T J ) and L p The size of the shape parameter β obtained under the life standard should be the same. Depend on Figure 4 with Figure 5 Available in different L p B under standard X The activation energy E of the lifetime model a ,...

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Abstract

The invention discloses an LED service life prediction method under an actual operation environment and belongs to the LED product test technology field. The method is characterized by through acceleration test report data, establishing a single LED service life model and a batch of LED service life models possessing a same acceleration factor; and through constructing an internal junction temperature feedback system graph of a key factor p-n junction influencing an LED service life, acquiring a real-time junction temperature during LED work. According to the real-time junction temperature during LED working and the batch of LED service life models, the LED service life is predicted. The method is suitable for various kinds of LED work current and extraneous environment temperature change occasions. A method of actually predicting a certain proportion of LED-failure required time under various confidence or confidence intervals is provided. The method is good for guiding LED heat dissipation and a system design, a service life and reliability of an LED illumination product are increased, and the method can be popularized in an LED driver and service life prediction of a whole LED illumination system.

Description

technical field [0001] The invention discloses an LED life prediction method based on an actual operating environment, and belongs to the technical field of LED product testing. Background technique [0002] Compared with traditional light sources, LEDs have the advantages of high efficiency and long life, and have been widely used in recent years. At present, the lifespan of LED products on the market is usually rated as 25,000-50,000 hours, but users find that LED products often fail before the nominal lifespan, and cannot achieve high reliability operation. In addition to the LED product failure caused by the LED driver, the main reasons for the unequal life of the LED light source and the nominal life are: (1) The definition of LED life is relatively vague, and there is a lack of understanding of factors such as working conditions, failure standards, reliability, and confidence Consider; (2) The nominal life is usually tested under the specified current and temperature ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/44
CPCG01R31/44
Inventor 曲小慧连静法罗
Owner SOUTHEAST UNIV
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