利用光感測二極體量測自動光功率控制電路驅動各類波長的發光二極體之研究

數位式自動光功率控制系統電路採用一顆多功能微處理器控制，內建放大器和數位類比轉換機制，而得以簡化多顆光電配件和電路架構。不需外接光偵測器，數位式自動光功率控制系統電路即可直接攫取發光二極體的兩端點電壓差。在外在環境溫度變化下，透過發光二極體的特性，數位式自動光功率控制系統電路可進行電壓迴授控制，達到功率的穩定。本論文使用本研究團隊研發的自動光功率控制系統電路，驅動白光、紫外光、藍光、綠光、紅光和紅外線等...不同色光的發光二極體，在溫度-30℃~80℃環境下，量測被驅動的各發光二極體電壓，並計算各發光二極體的光功率，證實了此電路系統能有效的驅動多種發光二極體，並且能對溫度的變化進行補償迴授機制，是能有效的控制光功率之穩定輸出。

關鍵字

自動光功率控制系統；發光二極體

並列摘要

The Digital APC with a versatile micro-processor control, built-in amplifier and digital-to-analog convertor, simplifies multiple satellites optoelectronic components and circuit architecture. Theoretically, the Digital APC is capable of capturing the voltage difference between two edges of the light emitting diodes, without external lighting detectors. The Digital APC also utilizes the transmission characteristics of the light-emitting diodes on voltage feedback control to achieve power stability. In this study, the Digital APC is adopted to drive white、UVA、blue、green、red and infrared, etc.… different color light emitting diodes at temperature between -30 ℃ and 80 ℃. The voltage differences between the driven color light emitting diodes are measured and used to calculate the optical power of each light emitting diode. The research result verifies the Digital APC that can effectively drive a variety of light-emitting diodes, and can compensate for changes in temperature feedback mechanism. Digital APC is also effective in controlling the stability of optical output power.