本文旨在分析及製作全橋式直流-直流功率轉換器並聯系統。本系統採用全橋式直流-直流功率轉換器將低電壓源轉換為高電壓輸出，並且配合盲時之設定與相移式控制達到零電壓切換以降低開關之切換損失。文中根據閉迴路控制策略，使全橋式直流-直流功率轉換器能提供穩定之輸出電壓至負載。
　　全橋式直流-直流功率轉換器之並聯運轉方面，本文採用小容量及模組化之共用直流電壓源架構。經由適當的投入/切離控制，適時地並聯其它功率轉換器至系統，大幅提高並聯運轉之容量及利用率；在並聯運轉時，採用均流策略，以達成共同分擔負載。
　　本文以高性能、低成本的數位信號處理器TMS320F2812為控制核心，實現相移式脈波寬調變控制，並配合電壓、電流回授以完成閉迴路控制，其中並聯運轉之控制策略皆由軟體程式完成，以減少硬體電路，並增加系統運作可靠度。本文單一功率轉換器模組輸出為700W，並完成約2.1kW並聯運轉之系統，其輸入電壓為50V，輸出電壓為200V，其電壓調整率為1.27%，輸出電壓漣波因數為1.06%，整體效率為82%。

　　This thesis is concerned with the analysis and implementation of parallel full-bridge dc-dc power converter systems. Full-bridge dc-dc circuit structure is used to convert the low voltage source to that of the high voltage. Meanwhile, zero-voltage switching is accomplished through phase-shift and dead-time controls to reduce switching loss. Finally, the closed-loop control system of the proposed power converter can provide a steady output voltage to load.
　　The full-bridge dc-dc power converters of common dc voltage topology designed with small-rated power modules are adopted to the proposed parallel system. The capacity and utilization rate of the parallel system can be flexibly increased by suitable switch-in and switch-off controls. Under the situation of parallel operation, current-sharing strategy is used to accomplish load-sharing.
　　In this thesis, the high-performance, low-cost digital signal processor TMS320F2812 is used to control the system with the voltage and current feedbacks, and achieve the phase-shifted pulse-width modulation. The control of the paralleled control strategy is conducted by software to reduce the component count and improve system reliability. The single power converter module is 700W and a prototype of 2.1kW parallel operation system is developed. The input voltage is 50V. The output voltage is 200V. The efficiency of the system reaches 82%, the voltage regulation is 1.27%, and the output voltage ripple is 1.06%.

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