A Star-Structured LC Resonant Switched Capacitor Equalizer for Lithium-ion Battery Strings

2019 IEEE 4th International Future Energy Electronics Conference (IFEEC) Pub Date : 2019-11-01 DOI:10.1109/IFEEC47410.2019.9014940

Utpal Kumar Das, Kok Soon Tey, Mohd Yamani Idna Idris, S. Mekhilef

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引用次数: 1

Abstract

The enhancement of balancing speed as well as fully equalization is a great challenge in switched capacitor (SC) based cell voltage equalizers. In this study, a star-structured LC resonant SC equalizer is proposed to equalize the unbalance cell voltages completely within minimum time. An inductor is used in series with each capacitors of the proposed equalizer. The designing procedure confirms the zero-current-switching (ZCS) and zero-voltage-gap (ZVG). ZCS reduces the switching loss by removing the current spike during the switching periods. ZVG confirms the complete voltage equalization among the cells. The star structure reduces the balancing time by creating the direct any-cell-to-any-cell paths for exchanging the excess energy among the cells. The MOSFET is used as switches and only a pair of complementary PWM signal is used to operate the whole circuit. The proposed equalizer is validated in both simulation and experimentally. Results show that the proposed equalizer performs better compare to the conventional equalizers especially in balancing time and complete equalization.

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一种用于锂离子电池组的星形LC谐振开关电容均衡器

提高平衡速度和完全均衡是基于开关电容的电池电压均衡器面临的一个巨大挑战。在本研究中，提出了一种星形结构LC谐振SC均衡器，可以在最短的时间内完全平衡不平衡的电池电压。该均衡器的每个电容都串联了一个电感器。设计过程确定了零电流开关(ZCS)和零电压间隙(ZVG)。ZCS通过去除开关期间的电流尖峰来降低开关损耗。ZVG证实了电池之间的完全电压均衡。星形结构通过创建任意细胞到任意细胞的直接路径来减少细胞间多余能量的交换，从而减少了平衡时间。MOSFET用作开关，仅使用一对互补的PWM信号来操作整个电路。通过仿真和实验验证了该均衡器的有效性。结果表明，与传统的均衡器相比，该均衡器在均衡时间和完全均衡方面具有更好的性能。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2019 IEEE 4th International Future Energy Electronics Conference (IFEEC)

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