High power charging system for electric car and control method thereof

Abstract

The invention proposes a high power charging system for an electric car. The high power charging system comprises a power cell, a charge connecting device, an external power supply device, and an electric control device, wherein the power cell is arranged inside the electric car; the charge connecting device comprises a power supply plug and an automobile plug; the external power supply device is connected with the power supply plug of the charge connecting device; the charge control device is arranged inside the electric car, connected with the power cell and connected with a car plug of the charge connecting device; and a modulated pulse-width modulation (PWM) wave signal is transmitted by the charge connecting device between the charge control device and the external power supply device, so as to achieve communication of the charge control device and the external power supply device. By adopting the system, uniform switching of a working state of each system can be achieved; each split system of the car is harmonically controlled; and the high power charging system is strong in compatibility. Meanwhile, a control method of the high power charging system for the electric car is also provided by the invention.

Description

technical field [0001] The invention relates to the technical field of electric vehicles, in particular to a high-power charging system for electric vehicles and a control method thereof. Background technique [0002] With the development of science and technology, environmentally friendly and energy-saving electric vehicles are playing the role of replacing fuel vehicles. However, the popularization of electric vehicles still faces some problems. Among them, high mileage and fast charging technology have become a major issue in the promotion of electric vehicles. problem. [0003] At present, most electric vehicles use large-capacity batteries. Although the battery life of electric vehicles can be improved, the same large-capacity batteries also bring about the problem of long charging time. Although professional DC charging stations can quickly charge batteries, the high cost and large footprint make it difficult to popularize such infrastructure. At the same time, due to...

AI Technical Summary

Problems solved by technology

[0005] Scheme (1): If figure 1 and figure 2 As shown, the on-board charging and discharging device in this scheme mainly includes a three-phase power transformer 1', a three-phase bridge circuit 2' composed of six thyristor elements, a constant voltage control device AUR and a constant current control device ACR, but this scheme is seriously wasteful space and cost

[0006] Scheme (2): If image 3 As shown, the on-board charging and discharging device in this scheme installs two charging sockets 15' and 16' to adapt to single-phase / three-phase charging, which increases the cost; the motor drive circuit includes a filter module composed of inductor L1' and capacitor C1', When the motor is driven, the three-phase current passes through the filter module to generate loss, which is a waste of battery power; the inverter 13' rectifies / inverts the alternating current during charging and discharging in this scheme, and the voltage cannot be adjusted after rectification / inversion, which is applicable The battery operating voltage range is narrow

[0007] To sum up, most of the current AC charging technologies on the market use a single charging technology. This technology has low charging power, long charging time, large hardware size, single function, and is limited by the voltage level of power grids in different regions. shortcoming

[0008] In addition, as one of the core components of electric vehicles, the power battery charging system is generally divided into vehicle-mounted AC charging system and fast DC charging system. The traditional vehicle-mounted AC charging system has power conversion modules, control modules, etc., and the charging power is small. and industrial grid direct charging, which has superior convenience, but the control method of the low-power AC charging system can no longer meet the requirements of the high-power AC charging system

The fast DC charging system only needs the corresponding power distribution circuit on the vehicle side and the power battery management system to assist in the control. The cost of the vehicle is small and the charging power is large. However, the charging facilities of the fast DC charging system require huge power conversion modules and other equipment. It is inconvenient for users to charge at specially constructed charging stations

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