本論文提出應用於車用12 V - 48 V電池充電系統之非隔離雙向直流-直流轉換器，採用兩相交錯式同步升/降壓轉換器，並以耦合電感取代傳統電感。本論文以多相式架構，能減少各相之元件應力，且有效降低輸出電壓及電流漣波，並透過區間分析出不同區間之等效感量，再藉由分析耦合電感之特性，與一般無耦合電感比較其電感電流之漣波大小及電路之響應速度。閉迴路控制以微控制器實現數位化之電壓及電流雙迴路控制，可對電池進行定電壓/定電流之充放電策略，小信號分析、控制器設計及系統穩定度分析亦於文中進行探討。開關採用氮化鎵功率元件，最終實現開關切換頻率400 kHz、輸入電壓12 V、輸出電壓48 V、輸出功率1 kW、升壓模式最高效率97.13%、降壓模式最高效率97.28%之雙向交錯式轉換器。

This thesis presents a non-isolated bidirectional DC-DC converter de-signed for 12V-48V automotive battery charging systems. The con-verter adopts a two-phase interleaved synchronous buck/boost con-figuration, replacing traditional inductors with coupled inductors. The multiphase architecture reduces component stress in each phase and effectively minimizes output voltage and current ripple. By analyzing different operating intervals, the equivalent inductance for each inter-val is derived. The characteristics of coupled inductors are then com-pared with traditional inductors to evaluate the ripple size of the in-ductor current and circuit response speed. A microcontroller imple-ments digital dual-loop voltage and current control for closed-loop control, enabling constant voltage/constant current charging and dis-charging strategies for the battery. Small signal analysis, controller design, and system stability analysis are also discussed. The switch utilizes Gallium Nitride power components, ultimately achieving a switching frequency of 400 kHz, an input voltage of 12 V, an output voltage of 48 V, an output power of 1 kW. This bidirectional inter-leaved converter reaches a maximum efficiency of 97.13% in boost mode and 97.28% in buck mode.

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