Design And Research On A Distributed Power Supply System For Battery Formation Processing

Charge/Discharge processing is one of the most important processes in storage battery production, which has a direct effeci on battery's quality. In battery industry, the Charge/Discharge process is controlled by electrical power conversion devices with the function of rectifying and inverting.This paper presents a scheme of distributed intelligent charging/discharging system for battery formation controlling. The system is developed into a structure of centralized AC-DC converter and distributed DC-DC converters with constant charging/discharging current control. The function of this system is bidirectional energy conversion, which has the converting form of AC-DC-DC and DC-DC-AC. The bidirectional energy flow is realized by rectifying and inverting and DC-DC converting. With modularization structure, the whole system is composed of one rectifying and inverting unit, many DC converting units and controlling networks. Microprocessors are used as the controlling core of the battery charging/discharging system, both in the rectifying and inverting circuit and in the bidirectional DC-DC converting to complete intelligent control and management. A central control unit organizes the operation of all units and communicates with IPC through controlling networks, to realize distributed control and remote monitoring of the battery charging/discharging process.The principle of charging/discharging formation processing is introduced in this paper. Compared with different schemes, a novel design scheme is presented to meet industrial application demands. All function modules of this system are developed, such as the rectifying and inverting module, bidirectional DC converting module, controlling management module and so on. Fuzzy control technology is adopted to realize constant current control, and a simulation research of the controlling process is also given. Finally, the summary of the paper is made and the further improvement of the system is proposed.As the harmonics pollution is greatly reduced by energy converting in DC side, the controlling system can be widely used in battery charging/discharging system. Furthermore, this design scheme also could be used to modify universal phase-control power supplies by adding bidirectional DC converting units on the DC side to form multi-channels of battery charging discharging.