摘要
动力型超级电容器组作为电动城市公交客车能量源时,必须保证电容单体在充、放电过程中的能量均衡,为此提出了双电源的均衡充电系统结构。通过电阻分压采样电路和继电器矩阵式均衡电源投切网络的设计,以FPGA为核心构成了均衡充电系统监控单元。这种控制方案实现了电容器组整体能量向电容单体的转移,保证了各单体的能量均衡,有效避免了过充、过放,有利于提高电容器组能量存储效能,并延长其循环使用寿命。
An equalization charging system, which consists of double power supplies, is developed to keep the energy uniformity of each cell of the serially connected ultracapacitor using in the electric bus. Voltage sampling circuit, switching network of the equaling power supply and the FPGA-based controller of the monitoring system are given. The proposed system diverts energy from ultracapaeitor stack to the weak ones automatically, and it can prevent ultracapacitor from overcharging and overdischarging by ensuring energy equalization of cells. It is propitious to improve energy efficiency and enhance the cycle life of ultracapacitor.
出处
《电子器件》
EI
CAS
2006年第3期755-758,共4页
Chinese Journal of Electron Devices
关键词
超级电容器
均衡充电
监控
FPGA
ultracapacitor
equalization charging
monitoring
FPGA
