本論文使用模型化基礎設計快速實作一非反向降-升壓型直流-直流電源轉換器，適用於以鋰電池(Li-ion Battery)作為供電來源的應用範圍，如常見行動電子裝置中的I/O Pad、音訊處理或資料儲存系統的電源供應，並提供6組輸出電壓準位可以切換。針對此類的電源轉換器業界產品、類比及數位文獻進行分析與說明。系統規格方面提出兼具穩、暫態規格功率級設計指引，並以「增強型責任週期疊合(Enhanced Duty-Overlap)」控制概念，提供系統在不同狀態下的限制條件，確保系統符合預計規格與穩定性。為了更貼近實際量測狀況，在Simetrix平台進行系統模擬，接著搭配FPGA開發板與PCB電路板所完成的Prototype進行實驗量測。最後將本作品的數位控制器透過國研院台灣半導體中心進行晶片下線，並搭配PCB電路板進行晶片量測。驗證本論文提出的控制概念其可行性與實際效果。

In this thesis, we accomplished a digitally controlled non-inverting buck-boost dc-dc converter with Model-Based Design Methodology. The power stage structure of the system is a synchronous controlled converter that has four power switches. In order to have a higher efficiency, the converter uses separated mode control scheme to make the converter operate either in buck-mode operation or boost-mode operation. By using the separated mode control scheme, the system have to conquer two problems in the mode-transition region between buck-mode and boost-mode operation. One is Pulse-Skipping phenomena,and the other one is unable to convert precise output voltage.We proposed a method that called “Enhanced Duty-Overlap Control” to ensure the converter has a stable and smooth output when input changes. The enhanced duty-overlap control will make the controller to offer the different duty limitation when the system is in different situation.
The specification of the system is designed for the applications that usually used in mobile devices, input voltage range of this converter is from 2.7V to 4.2V that fits the adjustable output voltage range of a common Li-ion battery. We built up a FPGA-based hardware platform prototype to verify the model-based design methododlogy. Model based design can effectively avoid coding errors caused by manual coding. Moreover, using this design method, not only find more bugs from model simulation, but also enable the team to implement rapid prototyping of FPGAs is faster than the traditional manual workflow.
This digital controller was manufactured by TSMC 0.18-um CMOS process technology.And the output load current can varies from 100mA to 300mA. The voltage ripple is less than 1% of output voltage when load current is 300mA(worst case), and the overshoot and undershoot voltage is less than 5% when load current transit between 100mA to 300mA.

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