多階層功率因數修正轉換器架構與一般轉換器架構相比，開關元件承受的跨壓較低，使同樣輸出規格的轉換器能夠使用耐壓較低的開關元件實現，並具有較低的開關切換損失。本論文主要針對使用寬能隙功率開關元件 GaN 與 SiC 實作之多階層功率因數修正轉換器，進行閉迴路數位控制法之研究，基於連續導通模式之平均電流控制法，設計電壓、電流與飛馳電容電壓平衡控制補償迴路，並使用相移 PWM 開關調變方式，同時研究架構中各模式下飛馳電容之充放電行為，進而設計飛馳電容電壓平衡迴路，進行飛馳電容電壓的主動控制，於系統設計規格下可使飛馳電容電壓 ??1 與 ??2 分別維持於1⁄3 與2⁄3 輸出電壓之目標值。本論文將透過模擬軟體進行電路功能驗證，並透過實體電路實現單相多階層功率因數修正轉換器的控制器，實驗結果系統可在 300 kHz 開關切換頻率，110 ???? 交流輸入下，輸出±200 ?之直流電壓，同時達到功率因數修正效果，在輸出功率 1kW 下效率可達到 95.1%，PF 值為 0.94。

Multilevel power factor correction converters differ from conventionalconverters in that the switching components have lower voltage stress, allowing theuse of lower voltage-rated switching components to achieve the same output specifications and lower switching losses. This thesis focuses on the closed-loopdigital control methods for multilevel PFC converters implemented with widebandgap power switches, specifically GaN and SiC. Based on the average current control method in continuous conduction mode, this study designs voltage, current,and flying capacitor voltage balance control compensation loops. Phase-shift PWM switching modulation is employed, and the charging and discharging behaviors of theflying capacitors in various modes of the architecture are analyzed. Subsequently, a flying capacitor voltage balance loop is designed for active control of the flying capacitor voltages, maintaining the voltages ??1 and ??2 at 1/3 and 2/3 of the output voltage, respectively, under the system design specifications. Circuit functionality will be verified through simulation software, and a single-phase multilevel PFC converter controller will be physically implemented. Experimental results show that the system, operating at a switching frequency of 300 kHz and an AC input of 110 ???? , can output a ±200 V DC voltage while achieving power factor correction.Under an output power of 1kW, the efficiency can reach 95.1%, and the Power Factoris 0.94.

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