本論文旨在設計與實現一組非隔離型且具有非線性電壓轉換比之降壓型直流-直流轉換器。在高降壓比需求且沒有變壓器隔離的條件下，一般降壓型直流-直流轉換器需要相當小的責任週期，而非線性電壓轉換比直流-直流轉換器能比一般直流-直流轉換器有更大的責任週期，提高開關利用率以及轉換效率。本論文以德州儀器公司之TMS320F28035晶片為主要核心數位控制，利用電壓、電流迴路來實現定電流/定電壓充電控制，並應用在充電系統之中。
本文先分析架構之動作原理以及小信號推導，接著介紹本論文架構之數位控制系統。之後，再說明本論文電路功率元件、數位控制參數與補償的設計。最後，實作一台規格為輸入電壓400 V、輸出電壓48 V、最大輸出功率600 W、應用於充電系統中之非線性電壓轉換比之降壓型直流-直流轉換器。

This thesis aims to design and achieve a non-isolated step-down DC-DC converter with non-linear voltage transfer ratio by digital-controlled. In the condition of high step-down conversion ratio and transformerless, classical buck converter needs very small duty. However, step-down DC-DC converter with non-linear conversion has larger duty than classical buck converter. It will raise the switch’s utilization and conversion efficiency. This thesis uses TMS320F28035 DSP chip for digital-controlled which is made by TI Inc. By using current loop and voltage loop, the thesis’s structure achieves the CC/CV multi charging scheme and to be applied in charge system.
Initially, it analyzes the operating principle and derives the small signal in this thesis. Next, it introduces the digital-controlled system of this thesis’s structure. Then, it explains the design of the circuit element, parameter of digital-control and compensator. After all, it achieves a non-linear conversion DC-DC converter to be applied in charge system with 400 V input voltages, 48 V maximum output voltage and 600 W maximum output power.

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