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首页> 外文会议>2010 the 5th IEEE Conference on Industrial Electronics and Applications >PWM photo-power control for light-emitting diode lighting system without photo-diode detection
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PWM photo-power control for light-emitting diode lighting system without photo-diode detection

机译：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

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摘要

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.
机译：使用发光二极管作为光源的缺点是其光输出功率高度依赖于温度。提出了忽略光电二极管作为亮度传感器并同时利用脉宽调制的新颖思想。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。控制器可以根据脉冲宽度调制来降低电气部件对温度的功率依赖性并调节发光二极管的亮度。以此方式，可以切断流过电子部件的电流以减少功率消耗并防止电子部件过热。最后，讨论了带镇流电阻的电压源，自动电流控制和拟议的光功率控制之间的比较。所有这三种补偿机制都没有光电二极管。实验结果表明，该方法可有效地提供恒定的发光强度。

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