中圖分類號： TN710 文獻標識碼： A DOI：10.16157/j.issn.0258-7998.222711 中文引用格式： 吳磊威，趙世偉，楊向宇. 基于移相控制的鋰電池組雙層電壓均衡電路[J].電子技術應用，2022，48(10)：123-128. 英文引用格式： Wu Leiwei，Zhao Shiwei，Yang Xiangyu. Voltage equalization circuit based on phase shift control for lithium battery pack[J]. Application of Electronic Technique，2022，48(10)：123-128.
Voltage equalization circuit based on phase shift control for lithium battery pack
Wu Leiwei，Zhao Shiwei，Yang Xiangyu
School of Electric Power，South China University of Technology，Guangzhou 510641，China
Abstract： The terminal voltage of a single lithium battery is low. In practical applications, multiple lithium batteries are often connected in series and in parallel to meet the voltage and power requirements. In order to avoid problems such as overcharging, overdischarge and low energy utilization caused by inconsistency of lithium batteries, it is necessary to balance the series lithium battery pack. In this paper, a double-tiered voltage equalization circuit based on switched-inductor and star-structured inductor-capacitor series branch is proposed, which uses two batteries as a single unit. Voltage equalization is achieved by switched-inductor equalization circuit inside the unit, and voltage equalization from any unit to any unit is achieved by the star-structured inductor-capacitor series branch equalization circuit, the speed of equalization between battery units can be controlled by adjusting the phase-shift duty ratio. Because these two equalization circuits share the same set of switches, the number of switches and their driving circuits, inductors and capacitors is reduced, and the cost is reduced. The results of simulation and experiment verify the validity of the equalization circuit.
Key words : voltage equalization；switched-inductor；inductor-capacitor series branch；phase-shift control
