Prediction method of optical power of led device

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.

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 ...

AI Technical Summary

Problems solved by technology

[0006] However, the disadvantage of the first method is that it only models the change of LED optical power with current, and does not propose the influence of junction temperature on LED optical power, so the model proposed by the first method can only be used for prediction The value of LED optical power at different currents cannot predict the value of LED optical power at different junction temperatures; the shortcoming of the second method lies in the lack of accuracy of the established model and the limitation of the scope of application. The second method The established model is only applicable within the range of experimentally measured data during modeling

If the predicted LED device is outside the operating range for which it was modeled, the LED optical power predicted by this method will be inaccurate

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