本論文主要在研製一輸出功率750瓦、交流側電壓230 V、直流側電壓750 V之雙向高效率、高功率密度再生能源系統應用之電源轉換器。為使工作應用範圍更廣，本論文採用同步整流方式使其能夠雙向功率傳遞。本論文採用無橋架構使整流模式之效率提高、換流模式則為T 型換流器架構，控制方面採用數位控制方法取代傳統以類比IC控制。傳統類比IC雖然控制成本較低，但相較於數位控制則有許多缺點，例如無法應用進階控制技術等等。因此，本論文使用數位控制器發展出，整流模式以平均電流法控制、換流模式使用單電壓極性切換控制之雙向轉換器。最後實現整流模式滿載效率98.11%、換流模式效率96.2%之高功率密度雙向轉換器。

This thesis aims to study and design an output power 750 W, AC-side 230 V, DC-side 750 V bi-directional high efficiency and high power density for power converter of green energy system. For wider range of applications, this thesis implements synchronous rectification to achieve bi-directional power transference and the bridgeless topology for higher rectification-model efficiency, the inverter-model applied is a T-type inverter topology. On other the hand, the digital control used to replace analog control, the analog control is economical and simple but compared with digital control, it are some disadvantages such as not able to be using advance control technology and so on. Therefore, this thesis realize average current mode control for rectification-model and unipolar PWM control for invert-model base on digital signal processor. Finally, a high power density bi-directional converter has been achieved, the rectification-model efficiency about 98.11% and inverter-model efficiency around 96.2% in full-load.

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