Multifunctional vehicle-mounted charging and discharging integrated system

Abstract

The invention relates to a multifunctional vehicle-mounted charging and discharging integrated system. The system comprises a three-phase input / gird-connected interface, a single-phase alternating-current electrical appliance interface, a single-phase input / gird-connected interface, a bidirectional single-phase / three-phase conversion AC / DC converter, a high-efficiency high and low voltage integrated DC / DC converter, a high-efficiency low-voltage DC / DC output interface, a power battery pack, a BMS module and a controller. The connection relationship is as follows: the three-phase input / gird-connected interface, the single-phase alternating-current electrical appliance interface, the single-phase input / gird-connected interface and the high-efficiency high and low voltage integrated DC / DC converter are separately connected with the bidirectional single-phase / three-phase conversion AC / DC converter; the power battery pack and the high-efficiency low-voltage DC / DC output interface are separately connected with the high-efficiency high and low voltage integrated DC / DC converter; and the BMS module is connected with the power battery pack. By means of the multifunctional vehicle-mounted charging and discharging integrated system disclosed by the invention, the system volume can be reduced; the cost can be reduced; the switching and conducting loss can be reduced; and the operation efficiency can be increased.

Description

technical field [0001] The invention relates to the technical field of electric vehicles, in particular to a vehicle-mounted charging and discharging integrated system for electric vehicles. Background technique [0002] In recent years, the electric vehicle industry has developed vigorously. The power batteries of many electric vehicles have been combined to form a huge energy storage device. The use of two-way charging and discharging equipment can improve the power utilization rate of the electric vehicle power battery pack, and the electric vehicle power battery pack Connecting to the grid can also regulate the peak and valley loads of the grid. In addition, with the continuous development and progress of electric vehicles, the on-board electrical equipment of electric vehicles is becoming more and more diverse. Common ones include lighting, on-board MP3, MP4, GPS and other DC low-voltage low-power equipment, and high-end cars also have on-board refrigerators. , car mas...

AI Technical Summary

Problems solved by technology

Although the system meets the charging requirements of the power battery pack, it can also transfer the energy of the power battery pack to meet other high and low voltage power requirements, but because it uses a common single-phase full-bridge bidirectional AC / DC converter and The composition structure of ordinary bidirectional DC / DC converter connection, it cannot realize power supply and grid connection in the case of three-phase power grid, and soft switching cannot be realized in the working process

Moreover, the device reuse rate of the independent BMS device and the independent low-voltage DC / DC conversion device is low, which greatly increases the volume and cost of the system

[0004] Other existing on-board charging and discharging systems, some can only realize some functions, and cannot meet the diverse needs of reality; some can realize most functions, but only physically integrate the devices that realize various functions. Large size, high cost and low conversion efficiency are not conducive to the development of the electric vehicle industry

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