SYSTEM FOR CHARGING BATTERY OF ELECTRIC VEHICLE

摘要

A system for charging EV battery, comprising: a plurality of central converters, each of which having an AC input and a DC output, the AC inputs are electrically connectable to an external AC power supply and the DC outputs are connected in series; at least one switch, each of which having a plurality of throw terminals, two pole terminals and an actuator, the throw terminals are respectively electrically connected to terminals of the DC outputs, the actuator is used for switching between electrical connection of pole terminals and throw terminals so as to selectively supplying a voltage at a central DC output between the two pole terminals as a central DC voltage; at least one transformer, each of which having a primary winding circuit and a secondary winding circuit, and the primary winding circuit being electrically connected to the external AC power supply; at least one distributed converter for supplying at least one distributed DC voltage with a level below that of the central converters, each of the distributed converters having an AC side electrically connected to the secondary winding circuit of the corresponding transformer and a DC side electrically connected to the central DC output of the corresponding switch in series; and a first controller connected to at least one switch, so that the actuator of electrical connection between the pole terminals and the throw terminals of respective one of the switches is controlled so as to supply a combination of the central DC voltage and the distributed DC voltage as a charging voltage for the battery of the corresponding electric vehicle. By having the EV battery charging system, it is helpful for decreasing the converter capacity while maintaining the charging capacity and vehicles with various nominal voltages can be charged simultaneously.