Super-capacitor stacks management system with dynamic equalization techniques

被引：78

作者：

Lu, Rengui ^{[1
]}

Zhu, Chunbo ^{[1
]}

Tian, Likun ^{[1
]}

Wang, Qi ^{[1
]}

机构：

[1] Harbin Inst Technol, Dept Automat Measurement & Control, Harbin 150001, Peoples R China

来源：

IEEE TRANSACTIONS ON MAGNETICS | 2007年 / 43卷 / 01期

关键词：

battery management; dynamic equalization; super capacitor;

D O I：

10.1109/TMAG.2006.887652

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

Super capacitor has the advantage of quick charge, large power density, and long cycle life. The shortage is the lower energy density compared with electrochemistry batteries. These features make it suitable for a short-distance electric bus used in the city. Because of the capacitance difference between the capacitor cells, after a number of deep discharging/charging cycles, the voltage difference between cells will be enlarged. This will accelerate the aging of the weak super capacitors and affect the output power. So, a management system with an equalization function is essential. In this paper, a practical super-capacitor stacks management system with dynamic equalization techniques is proposed. The function of the management system includes: monitoring the current, voltage, and temperature of the stacks, control of charge, and discharge with equalization online. A switched-capacitor equalization approach is adopted showing a low-cost way to meet the accuracy requirements. The dynamic equalized charging and discharging circuit is described. The algorithm to increase the operation speed and the precision is analyzed. By dynamically redistributing the current, the equalization procedure can be quicker and more efficient. This approach has been verified by experiments.

引用

页码：254 / 258

页数：5

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