本論文主旨在研製一組具均流控制之高功率隔離型雙向直流-直流系統，應用於電網與電池間兩端做為能量調節。系統可分為兩組相同高功率隔離型雙向直流-直流換器，轉換器再分為前後兩級電路，電池端功率級架構為交錯式升/降壓轉換器，電網端則為三相串聯諧振轉換器。前級架構以兩組功率開關信號錯相180°控制的升/降壓型電源轉換器組成，如此一來不但可以分散電流路徑降低功率元件上的電流，還能夠有效降低輸入與輸出電流的漣波。後級架構是三臂六開關的全橋型轉換器，具有三組變壓器和三組諧振槽，每一臂控制信號相位各差120°，並操作於串聯諧振區間。三組變壓器一次側和二次側都使用Y形接法，相較於一般全橋式轉換器，三相Y-Y接轉換器的變壓器平均分擔總輸出功率，如此能夠減小鐵芯體積。

In this thesis, an isolated high-power bi-directional DC-DC system with current sharing control is studied and implemented. The system is composed of two the same isolated high-power bi-directional DC-DC converter. The converter consist of two stages of bi-directional DC-DC converter. The stage attached to the battery-side is an interleaved buck/boost converter, and the stage of the grid-side is a three-phase series resonant converter. The battery-side stage consists of two buck/boost converters with interleaved control, so the load current not only can be shared to reduce the stress of the switch circuit but also decrease the output current ripple. The grid-side stage mainly consists of three half-bridge legs and six switches. There are three isolated transformers and three resonant tanks, the control signal for each leg has a phase-shift of 120° with each other. This converter stage is operated as a series resonant converter. The three isolated transformers are Y-connected on both the primary and secondary sides. Compared with traditional single-phase full-bridge converter, the three phase Y-Y control converter can share the output power with three transformers, so that the size of each transformer are decreased, and the cost can be reduced.

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