PWM photo-power control for light-emitting diode lighting system without photo-diode detection

2010 5th IEEE Conference on Industrial Electronics and Applications Pub Date : 2010-06-15 DOI:10.1109/ICIEA.2010.5514937

Chia-Hung Wang, Tzu-lun Hung, T. Sun

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引用次数: 2

Abstract

The drawback in using the light emitting diode as a light source is that its light output power is highly temperature dependent. This paper puts forth the novel idea of neglecting the photo diode as a luminance sensor and taking advantage of pulse-width modulation at the same time. A light emitting diode power controller based on automatic power control technology is introduced. The controller can reduce the power dependence of the electrical component on temperature and regulate light emitting diode brightness according to the pulse-width modulation. In this way, the current flowing through the electrical component can be switched off to reduce the power consumption and to prevent electrical component over heating. Finally, the comparisons between voltage source with ballast resistor, automatic current control and proposed photo-power control are discussed in this paper. All these three compensated mechanisms are without photodiode. The experimental results show the proposed method is effective in providing constant luminous intensity.

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无光电二极管检测的发光二极管照明系统的PWM光功率控制

使用发光二极管作为光源的缺点是它的光输出功率高度依赖于温度。本文提出了忽略光电二极管作为亮度传感器，同时利用脉宽调制的新思路。介绍了一种基于自动功率控制技术的发光二极管功率控制器。该控制器可以降低电气元件对温度的功率依赖性，并根据脉宽调制调节发光二极管的亮度。通过这种方式，可以切断流经电气元件的电流，以减少功耗并防止电气元件过热。最后，对电压源与镇流器电阻、电流自动控制和光电控制进行了比较。这三种补偿机制都没有光电二极管。实验结果表明，该方法能有效地提供恒定的发光强度。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2010 5th IEEE Conference on Industrial Electronics and Applications

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