基于移相策略的无变压器半桥锂电池均衡器

doi:10.16180/j.cnki.issn1007-7820.2025.02.001

Abstract

Abstract:

In view of the inconsistency between the cells of lithium battery and the difficulty and high cost of making the traditional half-bridge equalizer multi-winding transformer, a transformerless half-bridge lithium battery equalizer is proposed in this study, and the key factors affecting the energy flow between cells at high frequency are analyzed. Due to the use of phase-shifting control, shortest equalization path, and parallel equalization mode, the equalizer can quickly achieve simultaneous equalization between multiple battery cells. The equalization speed is fast, the equalization efficiency is high, and it is not affected by the number of battery cells in series,which makes the equalizer have the advantages of simple control, high equalization efficiency, high flexibility, and fewer switching devices. Based on the dynamic model of battery charging and discharging, an expression for energy balance between individual cells of the battery is derived, and verified by building a simulation model and experimental prototype. The simulation and experimental results show that the transformer free half bridge lithium battery equalizer based on phase shifting strategy can quickly achieve voltage equalization between battery cells.

Key words: lithium battery, half-bridge equalizer without transformer, phase-shift control, energy balance, energy flow factor, fast balancing, voltage equalization, series battery pack

CLC Number:

TN86

ZHOU Bin, KAN Jiarong, CHEN Heming, CHEN Weiwei, LI Yan, XU Sudong. A Transformerless Half-Bridge Lithium Battery Equalizer Based on Phase-Shift Strategy[J].Electronic Science and Technology, 2025, 38(2): 1-9.

Figures/Tables 15

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References 18

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参数	数值	参数	数值
电感L	2.2 μH	隔直电容C	940 μF
开关频率	50.0 kHz	移相比φ	-0.1~0.1
P调节器	1 000.0	-	-

参数	数值	参数	数值
等效漏感L	2.2 μH	励磁电感L_m	300 μH
开关频率	50.0 kHz	移相比φ	-0.1~0.1
P调节器	1 000.0	-	-

参数	数值	参数	数值
FPGA型号	Altera-EP4CE10	MOSFET	AO4410
电感L	2.2 μH	驱动芯片	IR2104S
隔直电容C	940.0 μF	P调节器	1 000.0
开关频率	50.0 kHz	移相比φ	-0.1~0.1

	U_B₁/V	U_B₂/V	U_B₃/V	U_B₄/V	φ₁、φ₂
情况1	3.70	3.62	4.04	4.04	0.000
情况2	3.70	3.62	4.04	4.04	0.025
情况3	3.70	3.62	4.04	4.04	0.050
情况4	3.70	3.62	4.04	4.04	0.075
情况5	3.70	3.62	4.04	4.04	0.100

	U_B₁/V	U_B₂/V	U_B₃/V	U_B₄/V
情况1	3.77	3.84	3.83	3.72
情况2	3.65	3.81	3.93	4.04
情况3	3.81	3.99	3.61	3.06

A Transformerless Half-Bridge Lithium Battery Equalizer Based on Phase-Shift Strategy

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