本論文主要在研製一輸出功率1000瓦、輸入交流電壓90V至264V、輸出直流電壓400V之高效率、高功率密度綠能系統應用之電源轉換器。本論文採用無橋架構中的圖騰柱無橋式架構，利用氮化鎵高電子移動率電晶體取代原先的金氧半場效電晶體，達到高功率、高效率之圖騰柱無橋式功率因數修正器，控制方面採用數位控制方式取代傳統類比IC控制模式。傳統類比IC因成本較低，經常被使用，但與數位控制相較之下在缺點上較多，無法應用高階控制技術。因此，本論文使用數位控制器發展出，以平均電流法為主要控制策略，另外為了改善數位化控制，造成取樣上的誤差，加入數位化電流取樣修正控制法，以及因為連續導通模式與不連續導通模式電流轉移函數不同，造成的失真，加入責任週期前饋控制法。最後達到輸入交流電壓230V，最高效率為98.8%、輸入交流電壓115V，最高效率97.22%之高效率轉換器。

This thesis aims to study and design a power converter for high efficiency, high power density green energy system implementation. With output power 1000W, input AC voltage 90V to 264V, output DC voltage 400V. This thesis adopts totem pole bridgeless topology, using Gallium nitride High electron mobility transistor to replace Metal Oxide Semiconductor Field Effect Transistor(MOSFET), implements a high power, high-efficiency totem pole bridgeless power factor corrector. On the other hand, using the digital control to replace the analog control, the analog control is economical and simple but when compared with digital control, there are some disadvantages such as not able to use advanced control technology and so on. Therefore, this thesis using average current control based on digital control as the main control strategy. In addition, in order to solve the problem of sampling error, a digital current sampling correction control method has been added. The difference of the transfer function between continuous conduction mode and discontinuous conduction mode current could result in current distortion, which has been solved by using the duty ratio feedforward method. Finally, a high-efficiency converter has been achieved, 98.9 % of efficiency under 230 V AC input voltage and 97.22 % of efficiency under 115 V AC input voltage.

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