電流箝制相移控制之隔離雙主動半橋直流－直流轉換器

Isolated Bidirectional Dual-Active-Half-Bridge DC/DC Converter with Current-Clamp Phase-Shift Control

本文提出電流箝制相移控制之隔離雙主動半橋直流–直流轉換器之研製，雙向主動半橋直流–直流轉換器具有雙向功率、電器隔離、高升壓比與零電壓開關切換之優點，適合電動車、直流不斷電電源與太陽能光伏發電等儲能系統。儲能系統採用雙向直流–直流轉換器，需具有電壓控制與電流控制迴路，係利用相移控制來調整變壓器兩端電壓之相位來控制能量傳輸方向與大小。峰值電流模式只適用於輸出電壓高於輸入電壓，而無法控制此雙向直流–直流轉換器之電流控制迴路。本文所提之電流箝制相移控制法，具有適用於輸出電壓高於、等於與低於輸入電壓之隔離雙主動半橋直流–直流轉換器，此轉換器之電流箝制相移控制功能具有良好之穩態與動態特性。本文實作一500 W之隔離雙主動半橋直流–直流轉換器，驗證此電流箝制相移控制法之性能及可行性。

An isolated bidirectional dual-active-half-bridge (DAHB) DC/DCconverter with a current-clamp phase-shift control is proposed in this paper.The DAHB converter combines the functions of a bidirectional power flowtransformer, with features including galvanic isolation, high step-up ratioand zero voltage switching, making it highly applicable to energy storagesystems in electric vehicles and in the generation of DC uninterruptiblepower and solar photovoltaic power. In energy storage systems equippedwith the bidirectional DC/DC converter that requires a voltage and current control loop, the phase shift controller controls the direction and magnitudeof the energy transfer by adjusting voltage phases across the transformer.The peak current mode is applicable only when output voltage is higherthan input voltage, and hence, cannot be used as a current control loop inthis bidirectional DC/DC converter. Therefore, the proposed current-clampphase-shift control method may be applied to output voltage that is higherthan, equal to and lower than the input voltage of the isolated bidirectionalDAHB DC/DC converter. The proposed current-clamp phase-shift controlof the converter exhibits good steady-state and dynamic performance duringthe bidirectional operation for the energy storage systems. Finally, a 500 Wexperimental prototype is built to show the performance and verify thefeasibility of the proposed isolated bidirectional DAHB DC/DC converterusing the current-clamp phase-shift control.