[[alternative]]Design and Implementation of Xenon Lamp Electronic Ballast

碩士電機工程學系[[abstract]]近年來人們對於照明設備的要求越來越高，高照度的氙燈已成為照明界的主流，目前市面上常見的氙燈電子式安定器大多以全橋反流器為主，其缺點為控制方式複雜以及元件成本太高，而傳統式半橋反流器則因電容內阻(ESR-Equivalent Series Resistance)不一容易造成分壓不均影響照明品質，因此本文設計一低成本且能克服傳統半橋反流器缺點之氙燈電子式安定器。 本研究所提出的架構是以12 V電池作為輸入電源，由返馳式轉換器作為DC-DC轉換的部份，利用該轉換器在不連續導通模式時負載開路將產生400 V高壓的特性來點亮燈，當氙燈點亮後轉而操作於連續導通模式下，並提供一組170 V穩定的電壓源給後端之半橋反流器，透過中心抽頭式變壓器，產生兩組85 V相同的電壓源，經過半橋反流器切換為交流電，供給負載氙燈使用，最後利用控制電路，進行35 W定功率輸出，以兼顧燈管壽命及照明品質，最後實際接上氙燈進行實驗測試，以驗證系統之可行性和穩定性，經由實測結果顯示整體系統效率約為72 %。[[abstract]]In recent years, people require higher quality of illumination equipment. The xenon lamp with bright light has become the mainstream of illumination industry. In the market, the most common xenon lamp electronic ballast installs full-bridge inverter, which has complex control method and high component cost. However, the unstable ESR (Equivalent Series Resistance) of traditional half bridge circuit causes the neutral point voltage unbalance and influence lighting quality. The study thus designs a low cost electronic ballast to conquer the problem of traditional half bridge circuit. The framework in this study provides a framework with 12 V lead-acid Batteries as input terminal; Flyback converter as part of DC-DC converting. The characteristic of Flyback’s high voltage (400 V) under the status of DCM helps to light up. The system is therefore converted to CCM after lighting up and provides a stable voltage source (170 V) to half bridge inverter on the back. Two sets of identical voltage source through center-tapped-transformer supply power to load xenon lamp by converting DC to AC with half bridge inverter. The control circuit is applied as constant power control (35 W) to keep the lamp’s lifetime and lighting quality. Finally, the xenon lamp loading experiment proves the feasibility and stability of the system with 72% of overall system efficiency