Research on development of the high-frequency power conversion system that can decrease current ripple and application to battery charge system

在对电动车辆的电池（锂离子电池）充电的情况下，需要减小包括在充电电流中的电流涟漪。采用大容量电解电容器虽然可以减小电流涟漪，但增加了充电器的体积和成本。在本研究中，高频交流环节DC-DC转换器被用作电池充电器，并提出了新的控制方案，这种DC-DC转换器。介绍了采用该方法降低电解电容器容量的效果。

In the case of charging the battery(Lithium-ion battery) of the electric vehicle, it is necessary to decrease the current ripple included in charging current. Though the current ripple can be decreased by using the mass electrolytic capacitor, the cost and the volume of the battery charger is raised. In this research, a high-frequency AC link DC-DC converter is used as the battery charger and new control scheme is proposed for this DC-DC converter. The effect of the decrease of the capacity of the electrolytic capacitor by using the proposal method is described.