本文提出一具有高升壓比之直流-直流轉換器，以提升如蓄電池、太陽能模組或燃料電池之低電壓輸出特性之直流電源系統。基於Cockcroft-Walton(CW)倍壓器之高升壓比特性，本文所提出之電路架構無需使用升壓變壓器即可達到高電壓輸出比。本文也提出一個新的方法來描述CW倍壓電路之等效電路模型，以簡化電路分析及方便於模擬。本文將轉換器應用於太陽能發電系統，並使用擾動觀察法作為最大功率追蹤控制策略，使其太陽能達到最大功率輸出。此外， CW倍壓電路之輸出端為串接的電容器，因此後級結合三階層變流器以提供交流電輸出。此太陽能系統是以數位信號處理器(DSP, TMS320F2812)做為硬體數位化控制器，處理回授訊號並提供適當的脈波寬度調變訊號觸發開關元件，並以電壓記錄器記錄系統日功率變化。

This thesis proposes a high step-up dc-dc converter for boosting the low dc voltages from the dc power source systems such as batteries, photovoltaic modules, and fuel cells. Based on the high step-up ratio characteristic of Cockcroft-Walton (CW) voltage multiplier, the proposed converter can provide high step-up ratio without using the step-up transformers. This thesis also derives a new method to represent the equivalent circuit of CW voltage multiplier for simplifying the analysis of the circuit and the simulation. This thesis applies converter in solar power system and use the perturbation and observation method as the control strategy of maximum power point tracking to achieve the maximum power output of solar energy. In addition, due to the output side of CW multiplier consists of cascaded capacitors, therefore, the last stage combines three-level inverter to provide ac output. The proposed solar power system employs a digital signal processor (DSP, TMS320F2812) as the digital controller to process the feedback signals and provides the pulse width modulation signals for the switches. The voltage recorder is used to record the variation of the power from system in whole day.

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