The Research Of Current-Share Paralleling Technique On Charging&Discharging System For Storage Battery

With the rapid development of the power electronic technology, power technology has become more mature, and it’s a goal people pursue constantly to develop high frequency, high power output, high performance. It’s one of the important ways to apply power module parallel operation to improve the power output, application of Current-Share Paralleling is the point of current power electronic technology research and development in which way. This paper applies the maximum current Automatic Current-Sharing Technology in discharging process in battery charging&discharging system to realize average distribution three groups of parallel power battery output current, effectively reduce thermal stress and electrical stress among storage battery packs, so as to improve the stability and reliability of the system.Taking the storage battery charging&discharging system as research background, and based on the system function requirements, this paper realizes constant current charging&discharging system design by stage. To save energy as the guidance, based on battery production process, this paper designs the public mother linear charging&discharging system to save energy, and realizes the main circuit, part of the hardware circuit, and the software design of AVR MCU inside. In addition, it analyzes its working principle and process in detail, and completes putting up project platform.The thesis analyzes the theory and principle of Current-share Paralleling Technology? and further researchs the related Current-share Paralleling methods. Then, it analyzes the characteristics and advantages and disadvantages of all kinds of the methods. In allusion to the battery charging&discharging system, it selects the maximum current Automatic Current-Sharing Technology as the most appropriate Current-Sharing way. This paper adopts integrated chip UC3907, and designs the controlling hardware circuit combined with the storage battery charging and discharging system. It can realize parallel multi—module to compose power supply system much more huge than one module. The paper makes the small signal analysis of the single DC/DC module and the multi—module, calculates the total gain of the voltage loop and current loop, and makes consideration for the start of Current-Share Paralleling of the battery pack.Finally, this paper makes simulation of current-sharing effect through the Matlab software. In the process of battery discharge, simulates output current of every storage battery pack. By comparing with output current differences of every storage battery pack that adds current-sharing control and not add, verifies the feasibility of current-sharing, so as to prove the necessity and rationality that add current-sharing control in parallel power system.