- 學位論文
車用高壓氣體放電燈電子式安定器性能分析之研究
Design and Analysis of Programmable Electronic Ballast Control Circuit for Automotive HID Lamps
摘要
由於汽車氙氣燈的發光效率、發光強度、演色性，以及使用壽命均較傳統鹵素燈佳，故近年來各車種逐漸地以氙氣燈取代鹵素燈，以增加行車之安全。為了能順利啟動車用氙氣燈，所以必須搭配電子式安定器才能使其正常的工作。然而，一般電子式安定器無法滿足失效自動斷電、防止電磁干擾，以及過載保護等功能。為了解決上述之問題，本論文利用返馳式轉換器搭配單晶片PIC16F877，程控其工作週期以提供35W定功率之輸出，並設計點燈之時序。經由實驗結果驗證，此程控設計不僅可限制點燈次數，避免連續高壓衝擊燈管，以達保護燈管之功效;亦可提供穩定的35W定功率之輸出，並適用於其它同型燈管。最後，分別量測與探討燈管操作於暫態期間與穩態期間之各種電氣特性。
並列摘要
Recently, in order to increase driving safety, Xenon headlight lamps for automobile systems have been substituted for halogen ones owing to its superior performance over the conventional halogen lamp: in the aspects such as higher luminous efficiency, luminous intensity, better color rendering, and longer life. To make high intensity discharge (HID) lamps keep working easily, we have to use an electronic ballast system for the HID lamp. However, the conventional electronic ballast control circuits couldn’t perform the automatic shut-down in the cases such as power breakdown, electromagnetic disturbance, or overload protection. To solve those problems, the boost-flyback associated with the microcontroller PIC16F877 were proposed to programmably control the duty cycle to keep output power constant and ignited. Experimental results verify that the limited igniting process can not only avoid the impact by the high voltage to protect the HID lamps, but also provide the stable power of 35W with other lamps. Finally, electrical characteristics of the HID lamps operated at start-up transition and steady-state are measured and discussed.