能源危機與改善地球環境是生活於二十一世紀當前的人類公民所應該共同面臨的急迫性問題。為了追求生活物質提升，人們加速能源的開採，造成目前能源短缺。能源轉換的過程中會引起環境污染，並持續加速地球生態環境惡化。為了徹底解決這兩項課題，唯有尋求環保無污染及能夠永續發電的再生能源。目前已有眾多再生能源已經投入發電行列，但占總體發電容量相當低的比例。如何提高再生能源發電容量及轉換效率，是亟需要研究的課題。
本文中所論述之免整流交流轉直流之轉換器，即針對能夠不依賴能源供應而能施行自主性發電之微發電機，在產生電能同時還須進行電能轉換所需要之轉換器進行設計。傳統發電機產生交流電壓後，須經過半橋或全橋整流濾波電路，方能輸出穩定之直流電壓，本文所提之轉換器電路無須經由以上程序，而能夠直接將交流電壓轉換成直流電壓輸出，方式是藉由兩種不同架構之直流轉直流轉換器(DC/DC converter)，運用疊加電壓原理來達成此一轉換目的。且不同於以往設計直流轉直流轉換器時使用電源管理IC，本文運用微處理機(MCU)技術來控制轉換器中之功率開關元件。並利用微處理機運算速度快與可程式化的優勢，同時設計出數位化之比例積分微分(PID)補償器與數位化濾波器(Filter)技術，施行於本文之免整流交流轉直流轉換器中。
本文另一部份是採用近年來所熱門之ZigBee短距離無線數據傳輸協定，並結合所研製之生物醫學感測系統，以將體溫與脈搏等身體機能數據，經由無線傳輸方式達成中央伺服器系統之監控目的。

Climate change and the need to manage diminishing fossil fuel reserves are two of the biggest challenges the modern world faces today. In order to secure the future for ourselves and generations to follow, people must act now to reduce energy consumption and substantially cut greenhouse gases, such as carbon dioxide. Energy efficiency and renewable energy are parts of the answer, not only to climate change, but securing future energy resources as well. Among many types of renewable energies, micro power generators (MPGs) which harvest energy from ubiquitous environmental excitation have gained immense attention in the last decade.
In this thesis, surveys about power generation principle, type, and applications of MPGs will be given first. Due to the low output voltage and low output power characteristics of MPG, special requirement of circuit design should be addressed. MPGs typically generate AC voltage while the load often requires DC voltage. Therefore, an AC-to-DC converter is required. In this thesis, input rectifierless converter is chosen as the power converter and a microcontroller is then used to implement the controller of the presented converter. In this thesis, digital PID compensator and digital filter are utilized as the digital controller.
This thesis proposes a portable biomedical sensor using micro-generator as power supply. The proposed sensor system consists of a Zigbee wireless module to achieve the goal of remote supervision. Detailed design and 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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