Three phase charger accommodating wide input voltage range with flexible single phase input options

A system for charging a battery from various three phase or single phase grid supply voltages includes a full wave bridge rectifier for receiving the AC supply voltage, two DC to DC converters for receiving unregulated DC output voltage from the rectifier, a first switch connected to a first input line of a first one of the two converters and a second switch connected to a first input line of a second one of the two converters, wherein each of the switches is set to a first position when the supply voltage is at a lower one of the varying voltage levels and to a second position when the supply voltage is at a higher one of the varying voltage levels. 种从各种三相或单相供电网电压对电池充电的系统，包括：全波桥式整流器，其用于接收AC供电电压；两个DC-DC转换器，其用于从整流器接收未经调节的DC输出电压；第开关，其连接到两个转换器中的第转换器的第输入线；以及第二开关，其连接到两个转换器中的第二转换器的第输入线，其中，开关中的每个在供电电压处于变化的电压电平中的较低电压电平时被设定到第位置，并且在供电电压处于变化的电压电平中的较高电压电平时被设定到第二位置。