Design and development of power battery charger

Design and development of power battery charger
With the increasingly prominent problems of energy and environmental protection, electric vehicles have attracted more and more attention due to their advantages of zero emission and low noise, and have a great room for development. However, there are still many problems to be solved in the development of electric vehicles, the key of which is the battery and its charging technology. The main goal of this paper is to design a charging device that is easy to use, quick to charge, and efficient to run. As a whole, a complete set of charging device can be divided into two parts: charging method and charging power source. In this paper, on the basis of analyzing the working principle and charging characteristics of the power battery, the charging method of the power battery commonly used in electric vehicles is studied. Among them, the rapid charging of lead-acid batteries is mainly studied, including factors affecting the rapid charging of batteries and measures to improve the charging speed. Finally, a set of fast charging methods suitable for lead-acid batteries are summarized. Then, the overall structure of the charger is introduced, and the functions of each part are analyzed. In the design of the charging power supply, the high-frequency switching power supply technology is adopted, which can effectively reduce the weight and volume of the device. In order to realize the requirement of negative pulse discharge of the battery, a half-bridge DC/DC circuit is designed at the output end of the charging power supply. Taking DSP2407 produced by TI as the core, hardware circuits such as sampling, control, communication and fault protection are designed. The man-machine interface interface design based on 51 single-chip microcomputer is carried out, the realization process of its software and hardware is introduced, and the communication protocol with the lower computer is formulated. The interface is powerful and easy to operate, provides a variety of charging methods to choose from, and can monitor the entire charging process in real time. Experiments show that the charger designed in this paper has a good waveform, works stably, meets the expected requirements, and can be put into practical use.