Design of electric car fast intelligent charger

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Summary:

In order to meet the demand of non-damage and fast charging of electric vehicle batteries, it is proposed to apply high-power switching power conversion technology to smart chargers. Combined with the actual charging requirements, the overall scheme of the electric vehicle on-board charging system is given, and the selection of the high-power charging power supply topology, the control circuit design and the protection circuit design are introduced. The experimental results show that the charging power source can realize the non-damage charging of the power battery in a short time, and meet the requirements of fast charging. The car smart charger researched in the article provides a reliable and effective charging device for the new electric vehicle, which has strong application value.

0 Preface

In the face of the environmental and energy problems caused by the pollution caused by the exhaust of traditional fuel vehicles and the excessive consumption of petroleum resources, electric vehicles have become the trend and hotspot of international automobile development with their good environmental protection and energy-saving characteristics. At present, the governments of many developed countries in the world, famous automobile manufacturers and related industry research institutions are all committed to the research and development and application of electric vehicle technology.

The car electric car charger is an indispensable part of the large-scale commercialization of electric vehicles. How to realize the fast and non-damage charging of the car charger is one of the key technologies that must be solved before the electric car enters the market. The charger designed in this paper is an in-vehicle charging device installed on an electric vehicle. Through the analysis of the current development status and development prospects of the vehicle battery, the current widely used valve-regulated sealed lead-acid battery is the research object. It adopts the more advanced and mature inverter technology, which has the characteristics of small size, light weight, high efficiency and large adjustment range. At the same time, from the functional point of view, it is also suitable for nickel-cadmium, nickel-metal hydride, lithium ion and other types of power batteries. Therefore, it has great practical value.

1 Overall structure design of intelligent charging system

Combined with the current typical mode of electric vehicle power supply and the development of charging power supply, the intelligent charging system designed in this paper is shown in Figure 1. The whole circuit adopts the design structure of AC / DC-DC / DC. The first is that the 220V AC mains is EMI filtered, the PFC correction circuit is changed to 380V DC, and then the DC/DC half-bridge conversion and corresponding control circuit are guaranteed. The output current and voltage meet the needs of the rechargeable battery. The PFC control circuit is mainly composed of a MOSFET tube, a Boost boost inductor, a control chip ICE2PCS01, and a DC filter capacitor. The DC/DC converter uses a half-bridge topology consisting mainly of a high frequency transformer, a MOSFET, and an LC filter circuit. The control part controls the charging current and voltage by controlling the on-time of the MOSFET tube in the half-bridge topology by the SG3525 to generate the feedback voltage of the battery terminal voltage and current signals. The control part also includes the current, voltage and temperature. Collection monitoring and real-time display.

Figure 1 Overall structure of the intelligent charging system

See the PDF document for details of its design (click on the PDF file to download)