A control system and control method for an electric vehicle charger

Abstract

The invention discloses a control system and control method for an electric vehicle charger. The control system comprises a control module, an execution module for transforming electrical energy, a battery management system and a touch screen, wherein after the system is initialized and has no faults after self-inspection, a charging plug is connected into an automobile charging interface; if the connection is failed, the system can automatically identify and alarm; if the connection is successful, a charging mode is selected from the touch screen according to the type of a battery pack; if the battery pack is a lead-acid cell, a conventional charging mode is selected, and a three-staged charging method based on a PID (Proportion Integration Differentiation) control algorithm is adopted; if the battery pack is a lithium ion battery, a charging method is selected according to residual electric quantity of the lithium ion battery; when the residual electric quantity of the lithium ion battery is smaller than 10 percent, an intermittent variable current-constant voltage charging method based on a sliding mode variable structure control algorithm is adopted for charging; otherwise, an intermittent variable voltage-constant voltage charging method based on the sliding mode variable structure control algorithm is adopted for charging. The control system and the control method disclosed by the invention play an important significance on improving the charging efficiency, enhancing the robustness and protecting the service life of the battery.

Description

technical field [0001] The invention belongs to the field of electric vehicle charging, and more specifically relates to a control system and a control method for an electric vehicle charger. Background technique [0002] The popularization of electric vehicles will greatly alleviate the problems of air pollution and energy shortage. The promotion and popularization of electric vehicles will inevitably have a great market demand for the corresponding supporting charging facilities. At present, the charging facilities on the market are mainly divided into charging stations, charging piles and charging machines. The charging station has the disadvantages of large area and high management and operation costs; when the charging pile has an emergency operation demand or needs to be charged at night, due to the influence of its charging time, it cannot replenish the power in time, which affects people's travel. Compared with the previous two charging facilities, the charger is sm...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies in the prior art, aiming at the problems of overcharging, undercharging, poor versatility, and poor anti-disturbance performance in conventional chargers, and to provide a charger with strong versatility, good robustness, and high charging efficiency. The electric vehicle charger control system and control method based on the sliding mode variable structure control algorithm has important application significance for improving charging efficiency, enhancing robustness, protecting battery life, and promoting the development of related industries.

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