Electric vehicle charging and discharging and motor driving integrated device

Abstract

The invention discloses an electric vehicle charging and discharging and motor driving integrated device. The device comprises a three-phase bridge type two-way DC/AC converter, an isolated three-portDC/DC converter, a main controller, an integrated device operating mode switching device, a single-phase alternating-current power source input interface device and a single-phase alternating-currentoutput interface. A three-phase inverter for driving a motor in an electric vehicle driving system is subjected to topological reconstruction to form a single-phase rectifier in charging or a single-phase inverter in outward power supplying, so that an integral hardware circuit structure is formed. The three-phase bridge type two-way DC/AC converter, the isolated three-port DC/DC converter, a relay switch and corresponding driving modules are subjected to control switching according to an integral control method in the main controller, so that seamless switching of charging-discharging and driving modes is realized, and braking energy recovery, V2V/V2L and vehicular low-voltage storage battery charging functions are realized. The integrated device has advantages of optimized size, weightreduction, cost saving and reliability improvement.

Description

technical field [0001] The invention relates to the field of electric vehicles, in particular to the fields of charging and discharging of electric vehicle power batteries and low-voltage storage batteries and motor driving. Background technique [0002] With the rapid development of the automobile industry, the gradual depletion of oil resources and the increasingly serious environmental pollution, the demand for sustainable energy development has become increasingly strong. Energy conservation and environmental protection have become important issues in the 21st century, and electric vehicle technology has emerged as the times require. Electric vehicles replace oil with electricity to achieve zero emissions. They have the characteristics of simple structure, high energy utilization efficiency, low noise, and low cost of use. It has become the development trend of the global automobile industry. Since the use of motor drive is more convenient to realize the integration of i...

AI Technical Summary

Problems solved by technology

[0005] 1. The circuit structure of the driving motor is complex and the cost is high

The motor drive contains a DC / DC converter module, which complicates the structure

At the same time, since the motor drive requires a large power, the DC / DC converter module needs to have a large power output capability, which will increase the corresponding cost;

[0006] 2. Energy recovery without braking

Most electric vehicles today have energy recovery during braking, which can not only improve the cruising range of electric vehicles, but also save energy, so controllers that do not have braking energy recovery will limit the cruising capacity of electric vehicles to a certain extent;

[0007] 3. No interface device for outputting single-phase alternating current

It cannot supply power to other electric vehicles and some mobile appliances, and cannot provide V2L and V2V functions;

[0008] 4. The charging function of the on-board low-voltage battery is not integrated

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