固態半導體照明驅動技術研究

A Study on Driving Technology of Semiconductor Lighting

許伯堅(Po-Chien Hsu)

指導教授 ： 黃秉鈞

國立臺灣大學/工學院/機械工程學研究所/碩士(2005年)

https://doi.org/10.6342/NTU.2005.01359

摘要

本研究旨在探討高亮度LED照明燈具的驅動控制技術，使其不受環境變化之影響，提高LED照明之可靠度；同時探討LED照明省電驅動技術的可行性，以提升LED照明的能源效率。本研究採用定電流驅動技術，先進行LED照明燈具的系統識別，並透過實驗分析求得動態系統模型。然後，進行定電流控制系統設計分析，採PI控制器結構，並利用閉迴路系統的敏感度函數以及燈具的設計需求條件，來求得一最佳控制器設計。
本研究實地設計製作一具輸入功率為96W的高亮度LED照明燈具，並以PIC微處理器製作一控制系統進行測試，實驗結果顯示，定電流控制系統具強健性，可以抗環境溫度變化之干擾，並提供過載及晶蕊溫度保護，於6安培定電流驅動下，環境溫度變化至35oC時，晶蕊溫度仍可保持在105oC以下。研究結果也顯示，不同燈具設計不會影響控制系統的性能。
本研究另探討定電壓與定電流之PWM驅動控制，分析其對LED照明省電的可行性。以微處理器完成之控制器實測結果顯示，無論採定電壓或定電流之PWM驅動控制，即使PWM頻率達到20kHz，仍無法達到省電驅動之目的，主要係因LED照度增加量會隨輸入功率增加而減小。

關鍵字

半導體照明

並列摘要

The main purpose of this research is to investigate the driving control technology of high power LED in order to improve the reliability under various operating and environmental conditions. Different driver designs are also studied in order to increase LED energy efficiency. System dynamics model for a LED luminare is first identified experimentally. A feedback control system for constant-current driving using PI controller was designed and analyzed. An optimal controller was determined using the closed-loop sensitivity function.
For verification purpose, a 96W LED luminare was designed and built. The control system was implemented on a PIC microprocessor. Experimental results show that the control system can stably and accurately control the current at a constant value at the variation of ambient temperature up to 35oC and the chip junction can be maintained at a temperature lower than 105oC. It is also shown that the design of luminare will not affect the control system performance. Another driver using constant-voltage and PWM technique was also studied to improve the lighting efficiency. Test results for the luminance measurement show that PWM driver could not improve the power consumption even for PWM frequency up to 20 kHz.

並列關鍵字

LED

參考文獻

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