The invention relates to a charging circuit applied to a battery module of an electric vehicle, and relates to a power conversion device. A buck-boost direct-current conversion module is adopted behind an isolation conversion module; the buck-boost direct current conversion module is controlled to sequentially work in a Buck working mode comprising a first working stage and a second working stagelocated behind the first working stage and a Boost working mode comprising a third working stage and a fourth working stage located behind the third working stage; the isolation conversion module is correspondingly controlled to output a first bus voltage Vbus 1, a rated output voltage Vbus 2 greater than the first bus voltage Vbus 1, the first bus voltage Vbus 1 and the rated output voltage Vbus2 greater than the first bus voltage Vbus 1; therefore, high-precision output of the buck-boost direct-current conversion module in a full-voltage range is realized, the isolation conversion module with lower rated output voltage can be selected, the market selection space of devices in the isolation conversion module is increased, and devices with excellent performance and price can be selected more easily.
本发明涉及应用于电动车的电池模组的充电电路,涉及电源转换装置,通过在隔离变换模块之后采用升降压直流变换模块,并控制升降压直流变换模块依次工作在包括第一工作阶段和位于其后的第二工作阶段的Buck工作模式和包括第三工作阶段和位于其后的第四工作阶段的Boost工作模式,并对应地控制隔离变换模块的输出第一母线电压Vbus1、比第一母线电压Vbus1大的额定输出电压Vbus2、第一母线电压Vbus1及比第一母线电压Vbus1大的额定输出电压Vbus2,而实现升降压直流变换模块在全电压范围内的高精度输出,并可选择较低额定输出电压的隔离变换模块,增大了隔离变换模块内器件的市场选择空间,更易选择到性能及价格兼优的器件。
Charging circuit applied to battery module of electric vehicle
应用于电动车的电池模组的充电电路
2020-10-09
Patent
Electronic Resource
Chinese
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