Charging system and charger thereof

The invention relates to a charging system and a charger thereof. The charger comprises a junction box, a switching unit having a first terminal connected to a system power supply, a second terminal connected to an external load, a third terminal connected to an external on-board charger, and a switching unit configured to selectively connect at least two of the first to third terminals; and a controller configured to control a connection state of the switching unit based on whether a power failure occurs in the system power supply and an operation mode of the external in-vehicle charger. 本发明涉及一种充电系统及其充电器，该充电器包括：接线盒，具有连接到系统电源的第一端子、连接到外部负载的第二端子、连接到外部车载充电器的第三端子、以及被配置为选择性地连接第一端子至第三端子中的至少两个端子的开关单元；以及控制器，被配置为基于系统电源中是否发生断电以及外部车载充电器的操作模式来控制开关单元的连接状态。