Charging control device for electric vehicles

Abstract

The invention relates to the technical field of electric vehicles charging, especially a charging control device for electric vehicles. The charging control device for an electric vehicle comprises a control box, wherein one end of the control box is provided with a plug, and the other end of the control box is provided with a charging gun; the charging gun is connected with an vehicle socket and the vehicle socket is connected with the electric vehicle; an on-board charging control circuit is arranged inside the electric vehicle; the control box comprises a on-off switch, a current detecting device for detecting the current, a voltage detecting device for detecting voltage, a earth wire detecting device, a residual current detecting device, a control circuit and an indicator lamp. The charging control device can be adapted to more domestic shortage of local supply voltage charging solution when the voltage is too low, solves the problems that when the voltage is too low, the charging device work under a rated current for a long time, thereby causing the fire caused by the overheat of the circuit, and solves the problems that the low voltage causes overcurrent alarm and the electric vehicle can not be charged.

Description

technical field [0001] The invention relates to the technical field of electric vehicle charging, in particular to an electric vehicle charging control device. Background technique [0002] With the increasing popularity of electric vehicles, the reliability and safety requirements for charging are getting higher and higher. On January 1, 2016, the country implemented the latest charging standard GB / T 18487.1-2015. According to this standard, the portable electric vehicle charging control box must have protection functions such as overcurrent protection, leakage protection, and ground wire disconnection. This kind of control box is mainly used for household portable conditions. [0003] The control box itself does not have the function of adjusting the current. It sends PWM (a) waves to the car charger through the CP signal line to limit the charging current. When the current exceeds the rated current of 2A, it will perform over-current protection. Generally, when the charg...

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Problems solved by technology

However, the use environment of the control box is not ideal. For example, there are too many electrical equipment on one line, sockets with poor quality, too long lines, and large fluctuations in the power of surrounding electrical equipment, all of which will cause the input voltage of the control to become smaller. , if the car charger cannot reduce the charging power, the input current of the control box will increase, and the excessive current operation for a long time will cause the risk of overheating of the external circuit. If the rated current exceeds 2A, it will be over-current protected, resulting in failure to charge. Can't charge where the voltage is insufficient

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