本文提出一用於驅動LED 燈之新型非接觸式返馳式轉換器，其變壓器採用無鐵芯和印刷電路板線圈繞製以達到能量傳遞與電氣隔離之功用。又因傳統非接觸式之返馳式轉換器效率低落，故本文整合諧振被動開關模組(Resonant Passive Switch Module, RPSM)至返馳式轉換器，使其具有自動改變電路架構之特性以達到提升轉換效率之目的。RPSM 電路同時可降低輸出電壓漣波使電路以免除使用電解電容，可進一步延長電路使用壽命。所提出的非接觸式架構在一次側採用低切換頻率之責任週期控制，因此可採用低成本微控制器實現調光控制。此外，本文所提出的電路其電壓轉換增益可以自動克服LED 串的順向導通電壓，因此適合LED 驅動之應用場合。為了進一步改善效率，本文同時採用雙脈波寬度調光，並利用ZigBee 來實現無線調光功能。
本文針對轉換器的工作原理、動作分析以及元件設計流程作介紹，並研製一12W 之原型電路，實驗結果用以驗證本文所提出之轉換器的正確性和性能改善，並與傳統返馳式轉換器相較，所提出的新型電路其平均效率改善了10.84%，而輸出漣波改善了70.96%。

In this thesis, a novel contactless, low profile and low output ripple dc-to-dc converter is first proposed. A coreless printed-circuit board (PCB) transformer is employed for energy transferring and isolation. To improve the power conversion efficiency, a resonant passive switching module (RPSM) is proposed and embedded in the conventional flyback converter. The presented RPSM module features the characteristic of automatic circuit structure change and boasts advantages such as low output ripple and better efficiency. Due to the lower output ripple, small non-electrolytic capacitors can be used to achieve longer life time. Another special feature of the proposed converter is that simple duty ratio control in the primary side as well as the low switching frequency can be adopted, which allows one to utilize a low cost microcontroller to realize the dimming control. In addition, the voltage conversion gain of the proposed converter can automatically overcome the forward voltage drop of LED strings, which makes it suitable for LED driving applications. To further improve the efficiency, double PWM dimming is also implemented. Finally, ZigBee module is utilized to attain wireless dimming capability.
In this thesis, operation principle, theoretical analysis as well as design guidelines of the converter is first provided. A 12 W prototyping circuit is then constructed and the experimental results and measured to validate the effectiveness of the proposed converter. Compared with those of a traditional flyback converter, the efficiency can be improved by 10.84 % with the embedded RPSM, and the output ripple can be improved by 70.96 %.

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