隨著近年來直流快充站需求漸增，本論文以研製一電動車充電樁之直流–直流轉換器為研究目的，直流充電與交流充電相比能夠以大功率實現快速充電，本論文透過多相交錯式控制能夠使電路輸出電流漣波降低，並且減少功率開關之電流應力。其動作原理以及電流漣波分析皆會在本文中介紹，本論文也對電路之功率元件進行損耗分析，再進一步設計本論文研製電路之電感。控制系統部分，控制晶片採用德州儀器公司(Texas Instruments)之數位訊號處理器TMS320F280049C，並使用Wolfspeed所生產之碳化矽功率開關CAS120M12BM2做為功率開關元件，透過碳化矽功率開關高耐壓、低導通阻抗以及高頻率之特點，最終實作輸出功率50 kW、輸入電壓800 V、輸出電壓150 V~750 V、操作頻率50 kHz之四相交錯式降壓轉換器。

With the demand of DC fast charging stations increasing in recent years, this thesis aims to develop a DC-DC charging pile for electric ve-hicle. Compared with AC charging, DC charging can achieve fast charging with high power. With multi-phase interleaved control, the output current ripple and current stress of switches can be reduced. Its operation principle and current ripple analysis will be introduced in this thesis. Also, the loss of the power components in the circuit will be an-alyzed. Furthermore, the inductance developed will also be design. In the control stage, the digital signal processor TMS320F280049C of Texas Instruments is used as the control chip. The switches of the power stage use Silicon Carbide power switch CAS120M12BM2 produced by Wolfspeed. The Silicon Carbide MOSFET has the characteristics of high voltage stress, low conduction loss, and high switching frequency. Fi-nally, an experimental platform of four-phase interleaved buck converter with an output power of 50 kW, an input voltage of 800V, an output voltage of 150V~750V, and an switching frequency of 50 kHz is being used to verify the theoretical design of four-phase interleaved buck.

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