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Direct-current charging system of electric automobile

A DC charging and electric vehicle technology, applied in electric vehicles, battery circuit devices, collectors, etc., can solve the problems of high complexity and large system power consumption, and achieve the effect of low power consumption and simple control

Active Publication Date: 2014-10-01
YANCHENG POWER SUPPLY CO STATE GRID JIANGSU ELECTRIC POWER CO +4
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is: the existing control scheme adopted to prolong the service life of the rechargeable battery by adjusting the output voltage of the DC / DC conversion unit is relatively complex, and the power consumption of the entire system is relatively large

Method used

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with accompanying drawing.

[0023] Such as image 3 Shown: Electric vehicle DC charging system, including three-phase transformer, centralized power conversion unit, 3 DC conversion charging units, 3 charging boxes, 9 switching units, 3 temperature sensors, 3 current sensors, 3 voltage Sensor and controller unit; the output voltages of the three DC conversion charging units are 600V, 800V and 1200V respectively.

[0024] The output end of each DC conversion charging unit is connected to three switch units, and the output ends of the three switch units connected to the output end of each DC conversion charging unit are respectively connected to the input ends of three battery boxes.

[0025] The switch unit is implemented by a relay, and the current sensor is mainly used to monitor the overcurrent phenomenon. The present invention mainly uses a voltage sensor to monitor the voltage, and then switches ...

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Abstract

The invention discloses a direct-current charging system of an electric automobile. The direct-current charging system comprises a three-phase transformer, a centralized type electric energy conversion unit, N direct-current conversion charging units and N charging boxes. The input end of the three-phase transformer is connected with a power grid electric wire, the output end of the three-phase transformer is connected with the input end of the centralized type electric energy conversion unit, and the output end of the centralized type electric energy conversion unit is connected with a direct-current bus. The input end of each direct-current conversion charging unit is connected with the direct-current bus. N*N switch units, N temperature sensors, N current sensors, N voltage sensors and a controller unit are further included. The output ends of the direct-current conversion charging units are connected with the input ends of the N switch units at the same time, and the output ends of the N switch units connected with the direct-current conversion charging units at the same time are connected with the input ends of N battery boxes respectively. The whole system is easy to control and low in electric energy consumption and saves more energy.

Description

technical field [0001] The invention relates to the technical field of electric vehicles, in particular to a DC charging system for electric vehicles. Background technique [0002] An electric vehicle is a new type of green and environment-friendly vehicle powered by a vehicle-mounted power supply and driven by a motor to drive the wheels. The on-board power supply of electric vehicles is generally composed of multiple sets of batteries arranged in series or in parallel to improve the power supply capacity of the batteries. Compared with traditional cars, electric vehicles have less impact on the environment, and their prospects are widely optimistic. [0003] The most widely used power source for electric vehicles is lead-acid batteries, but with the development of electric vehicle technology, lead-acid batteries are gradually replaced by other batteries due to low energy, slow charging speed, and short life. The power sources under development mainly include sodium-sulfu...

Claims

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Application Information

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IPC IPC(8): H02J7/04
Inventor 赵云峰胥荣武姚胜东刘大伟
Owner YANCHENG POWER SUPPLY CO STATE GRID JIANGSU ELECTRIC POWER CO
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