Vehicle-mounted charging system of electric vehicle

Abstract

The invention relates to a vehicle-mounted charging system of an electric vehicle, comprising a vehicle-mounted battery, a single / three-phase power conversion module, a direct current charging device, a charging contactor, a signal detection unit and a micro control unit (MCU), wherein the single / three-phase power conversion module, the direct current charging device, the charging contactor, the signal detection unit and the MCU are respectively connected with the vehicle-mounted battery; the direct current charging device comprises a voltage boosting module and a voltage reduction module which can charge the vehicle-mounted battery through boosting or reducing the voltage of an external direct current charging power supply; and the single / three-phase power conversion module directly multiplexes a vehicle-mounted inverter of the electric vehicle with an alternating / direct current bidirectional inversion function. In the invention, three charging modes of the electric vehicle are integrated in one vehicle-mounted charging system and are flexible and selectable, the vehicle-mounted charging system can be charged by three different charging voltages, i.e. external direct current voltage, single-phase alternating current voltage and three-phase alternating current voltage, and four alternating current charging modes can meet the diversity requirement of the charging modes of current electric vehicles; and meanwhile, the original vehicle-mounted inverter components can be multiplexed, thereby effectively reducing the cost.

Description

technical field [0001] The invention relates to the technical field of electric vehicles, in particular to a vehicle-mounted charging system for electric vehicles. Background technique [0002] With the approaching global energy crisis, energy-saving and environmentally friendly new energy electric vehicles are ushering in the opportunity to gradually replace traditional fuel vehicles. However, the popularization of electric vehicles still faces many problems, one of which needs to be solved urgently is the capacity of the vehicle battery. While looking for high-energy-density, high-safety and reliable vehicle-mounted energy carriers, how to improve the cruising range of electric vehicles is particularly important. Under the condition that the current supporting charging facilities are not perfect, how to make electric vehicles compatible with various charging equipment and external power supply is also a direction of current research. [0003] Most electric vehicles only ...

AI Technical Summary

Problems solved by technology

[0003] Most electric vehicles only use external commercial single-phase or three-phase AC power supply charging, or only use DC fast charging source charging at electric vehicle charging stations, which cannot achieve full compatibility with the three charging modes of DC / single-phase / three-phase

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