Design Of Battery Management System In240V High-Voltage Dc Power Supply For Communication

With the development of the communications industry, battery as the core of back-up power is paid more and more attention at home and abroad. Traditional UPS for communication systems are lead acid batteries containing Pb, which is a huge damage to the environment once abandoned. Now their alternative are Li-ion batteries, which has the advantages of lighter mass, better seal, lower self-discharge, environmental friendly. One kind of Li-ion batteries is ferric phosphate Li-ion battery which is now being widely used. The chemistry nature of Li-ion is active, in order to guarantee its stability, we need to design BMS accordingly. On the other hand, HVDC, as a new type of back-up power in communication, which has the properties of easily control, low investment, high dependence and translation efficiency. Given the above, we mainly concentrate on design of240v high-voltage DC supply system and the combination of the Li-ion batteries management system. I think my project is a wonderful trial in aspect of HVDC design for communication.First of all, we introduce the concept and research status of240V HVDC system and battery management system. Then the features of lithium batteries and lead-acid batteries are described which are commonly used in communications backup power. Through the comparison of application in HVDC systems, we point out that lithium batteries are more suitable for240V HVDC systems, and give the use of ferric phosphate Li-ion battery in the communications field. Then we introduce the key technology solutions in battery management system, which include voltage, current and temperature collection, equalization. For embedded software development we propose reliability design skills. After that the simulation and test results of the overall system are given. Based on the previous analysis, we give the integrated design of240V HVDC battery management system based the distributed thinking. Finally we summarize the design of the battery management system, and pointed out the direction of system optimization.