隨著現在科技的快速進步，地球上的能源也被加速消耗，所以世界各國對於節省能源和環保議題在近年備受矚目。本文所設計的免整流電路可以利用可自發電的小型發電機當作電能來源，呼應近年來全球對能源供應的需求。
本文首先對小型發電機的發電原理、類型和應用作簡單的介紹。並且針對小型發電機的低電壓，實現一特殊的輸入免整流之交流轉直流電路。此一電路不使用橋式整流器，而是使用了兩組直流轉直流轉換器直接將交流電轉成所需的直流電。在完成電路之後，本論文亦針對所提的輸入免整流系統進行數學模型及交流穩態的分析。由實驗可知本文所提出的交流轉直流電路對低交流電壓的可行性，同時也可以提升微發電機的應用層面，達到節省能源的目的。

With the rapid advancement of technology, the demand of all kinds of resources is increasing. Therefore, the issues about energy saving and environment protection are getting more and more attention. As a result,the micro power generator is receiving a considerable amount of interest as a means for energy saving.
In this thesis,we brief introduction about power generator principle, type and application will be given first. A circuit of input rectifierless AC-to-DC converter system will be implemented to convert the low output voltage of micro power generator. Using two DC-to-DC converters rather than a bridge rectifier, the presented system can work for low input AC voltage sources. The mathematical model and circuit implementation will be presented in the context. In order to verify the correctness of the proposed systems, simulation and experimental results are also provided to validate the context.

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