本文旨在研製全橋式直流-直流功率轉換器及單相全橋直流-交流功率轉換器之控制系統。本系統全橋式直流-直流功率轉換器採用相移式控制策略，推導出電壓閉回路控制，將燃料電池之變動電壓轉換為固定的高電壓。全橋式直流-直流功率轉換器使用並聯架構，並利用均流之策略，增加系統運轉之容量及利用率，以達到共同分擔負載，另使用主-僕式控制，增加系統之可靠度。在單相全橋直流-交流功率轉換器方面採用正弦脈波寬度調變單極性電壓切換技術，具有低諧波失真及快速響應之性能。單相全橋功率轉換器於電壓控制模式下，採用振幅鎖定控制法則，於負載劇烈變動下可提供快速響應及穩定之單相電壓源予單相負載使用，而在電流控制模式下，則可提供穩定的單相電流與市電併網。
本文之系統以運算速度快、成本低的數位信號處理器TMS320LF2812為整體系統之控制核心，功率轉換器之電壓閉回路控制法與電流閉回路控制法則皆由軟體完成控制，不但減少硬體電路元件，並增加了系統運轉可靠度。本系統目前已完成線性負載600 W供電測試，其單相交流電壓有效值為110 V，頻率為60 Hz，總諧波失真率為4.67 %，整體效率為80 %。另外，於市電併網時，可提供實功率至市電網路，實驗結果驗證了本文之理論分析。

This thesis is concerned with the analysis and implementation of parallel full-bridge dc-dc power converter and single-phase full-bridge dc-ac power converter. The full-bridge dc-dc power converter operates under voltage feedback control mode by using phase-shift control to convert fuel cell voltage source to high voltage. Under the full-bridge dc-dc power converters of parallel operations, using current-sharing strategies will increase capacity and utilization rate of the systems and accomplish load-sharing. The master-slave control technique is used in order to increase the reliability of the system.
To achieve low harmonic distortion and fast response, the single-phase full-bridge power converter adopts sinusoidal pulse-width modulation (SPWM) unipolar switching technique. The single-phase full-bridge power converter can provide constant and stable output voltage under load variation by using amplitude-locked loop algorithm of voltage-controlled mode, and stable single-phase current to power grid under current-controlled mode.
In this system, a high-speed, low-cost digital signal processor TMS320LF2812 is used to host the control system. The voltage and current control rules are realized by software. It can not only reduce the hardware cost but also improve the system reliability. The experimental results with linear load of 600 W show that the single-phase output voltage is 110 V, 60 Hz. The total harmonic distortion of output voltage is 4.67 %, the efficiency of the system reaches 80 %. Besides, the system can feed real power to the grid in grid-connected operation. Experimental results are given to justify the analysis.

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