以DSP控制之汽車用氙燈電子安定器研製

Implementation of A DSP-Based Controller for Electronic Ballast for Automotive Xenon Lamps

陳和正(Ho-Jeng Chen)

指導教授 ： 劉志文

國立臺灣大學/電機資訊學院/電機工程學研究所/碩士(2004年)

https://doi.org/10.6342/NTU.2004.10086

摘要

近年來由於汽車業界對光源的要求日益提高，尤其在發光強度、發光效率、壽命、演色性等均為重要的考量，因此氙燈便取代鹵素燈成為主流光源，目前新型的車種中，已開始普遍使用氙燈電子式安定器，用以驅動高強度氣體放電燈作為汽機車頭燈的光源。一般所採用的汽車用電子式安定器的基本電路架構包含直流/直流升壓電路、高壓點火電路、直流/交流換流電路、驅動與保護電路四個部份。
由於氙燈與所有的氣體放電燈一樣都具有負增量阻抗之特性，故安定器系統之穩定度問題成為設計時的一個重要議題。另外，燈管有著複雜的電壓-電流特性曲線以及時序控制需求，使用傳統類比式控制會較依賴元件特性來做反應，不易達到穩定操作。而數位控制器則具有可程式化且彈性佳的特性，對於燈管的動作狀態會有較準確的控制。
本文依傳統式架構實作出安定器之硬體電路，驅動與保護電路則採用DSP(數位信號處理器)來進行數位式控制。為了設計出適當的控制器使系統穩定，文中將推導出安定器系統與氙燈之小訊號模型，並分析安定器系統之穩定度議題。

關鍵字

電子安定器 ； 氙燈 ； DSP

並列摘要

Xenon lamp is nowadays the most popular type of automotive headlights. The High intensity discharge (HID) lamps have been used in headlights system with high efficiency, long life and natural color. There has been an emerging demand to replace the conventional halogen headlamps with the newly introduced small-wattage metal halide HID Lamps.
In general, the lamp ballast for automotive headlamp consists of four parts: DC/DC converter, Ignition circuit, DC/AC Inverter circuit, Control circuit. Because of the HID lamp has negative incremental impedance, one of the major issue of ballast design is the ballast system stability. Beside, Due to the complex lamp V-I profile and timing control requirement, control circuit built with conventional analog control is unavoidably cumbersome. With the flexibility and programmability, digital controller shows more advantages in this application.
An automotive HID ballast with DSP (digital signal processor) is developed. The small signal model of ballast/HID lamp is also presented and used to analyze the stability of the system.

並列關鍵字

Xenon Lamps ； DSP ； HID ； Ballast

參考文獻

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