LLCとLLC＋HB電流共振形DC-DCコンバータの特性比較

摘要

In this paper, the characteristics of the LLC-type current resonant converter and the LLC+HB-type are compared. Firstly, an equivalent model for analysis is provided by using Matlab/Simulink for the fundamental frequency component in the both resonant converter circuits, and the input impedance and the steady-state-gain characteristics are examined. Furthermore, they are compared with the experimental results. Secondly, the switching waveforms of the both converters are compared to each other, and the power loss in each device is discussed. As a result, it has been confirmed that a high efficiency of more than 95% is obtained in the both converters for input voltage of 38V and output of 24V/10A, and that the efficiency of LLC+HB type is improved by 0.1% efficiency when compared with LLC type.%本報告では，LLC電流共振形コンバータとLLC＋HB電流共振形コンバータの2つの回路方式を取り上げ，これらの特性比較を行う.まず，両コンバータの共振回路の基本波成分におけるMatlab/Simulinkによる等価モデル（特性解析モデル）を構築し，入力インピーダンス特性/定常ゲイン特性を調べるとともに，実測値との比較を行う．次いで，両コンバータのスイッチング動作における動作波形を比較し、損失低減効果を議論する．その結果，入力電圧380V，出力電力24V/10Aの仕様において，両回路方式とも95%以上の効率が得られ，LLC＋HB電流共振コンバータはLLC電流共振コンバータに比べて，入力実効電流を1/2に低減でき、0．1%の効率改善が得られることを確認した．