Prediction method of optical power of led device

A technology of LED devices and prediction methods, applied in the direction of instruments, special data processing applications, electrical digital data processing, etc., can solve problems such as no impact, limited scope of application, and inability to predict LED optical power, etc., to improve prediction accuracy, The effect of eliminating the chromaticity drift phenomenon

CN104504267BInactive Publication Date: 2017-09-26SUZHOU UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2017-09-26
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a method for predicting the optical power of an LED device, comprising the following steps: S1. At a constant junction temperature T0, measure the characteristic parameters ki and ko of the LED device according to the change curve of the optical power of the LED device with the input current, wherein , ki is the slope of the change curve of optical power with input current, ko is the intercept of the change curve on the optical power; S2, under constant input current I, according to the change curve of light power of LED device with junction temperature, measure the LED device The characteristic parameter kti and kto, wherein, kti and kto satisfy kt=-ktilnI-kto, kt is the e index coefficient of optical power-junction temperature curve; S3, according to formula Popt=(kiI+ko) exp[-(ktilnI+ kto)(Tj‑T0)], to predict the optical power Popt of the LED device at any junction temperature Tj and input current I. The invention considers the joint influence of junction temperature and input current on optical power, can predict the optical power of LED devices at any junction temperature and input current, and the prediction accuracy of steady-state optical power is improved, and can also be used to predict the dynamics of LED devices Optical power.
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Description

technical field

[0001] The invention relates to the technical field of LED device characteristic research, in particular to a method for predicting the light power of an LED device. Background technique

[0002] With the development of semiconductor technology, high-power LED devices are gradually being used in public lighting fields such as residences, factories, and shopping malls. LED has many advantages, such as high efficiency, high shock resistance, long life and so on. As a kind of semiconductor device, the performance of the LED device will also be affected by the junction temperature. The electrical power injected into the LED device will be converted into two kinds of energy, a part of the electrical power will be used to generate visible light and consumed in the form of optical power, and the other part of the electrical power will be consumed in the form of heat, and the generated heat will lead to high junction temperature, which The optical power of the LED ...

Examples

Embodiment Construction

[0045] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described The embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0046] ginseng figure 1 As shown, the invention discloses a method for predicting the optical power of an LED device, comprising the following steps:

[0047] S1, at a constant junction temperature T 0 Next, measure the characteristic parameter k of the LED device according to the change curve of the optical power of the LED device wi...