摘要 本篇論文旨在探討全橋相移諧振式驅動CCFL(冷陰極管)的設計與製作。在傳統的二極式驅動電路中,因變壓器的匝數比過高及開關損耗過大使得整體效率因而降低,同時也會產生散熱問題和電磁干擾的問題。採用全橋零電壓相移諧振式驅動電路,可以降低開關損耗,減少變壓器的匝數比,進而提高整體效率。 文中討論CCFL(冷陰極管)的發光原理,以及全橋相移諧振式驅動電路Inverter進行詳細的分析與討論。最後實作驅動19吋4支L型冷陰極管,由實驗結果可驗證全橋零電壓相移諧振式驅動電路效率可大幅提升。最後以極性變更方式來改善燈管之間的平衡問題。
Abstract This paper emphasize on the design and making of the full bridge phase shift resonance system for driving CCFL (Cold Cathode Fluorescent Lamp) and offers an easy balancing circuit for multiple lamps. Principle of CCFL lighting, detail analysis and full bridge phase shift resonance inverter designing are all discussed. An example for driving 4 lamps CCFL with balance for each lamp is also included.