Abstract
A new equalization topology using Cuk equalizer combined with double-layer selector switch is proposed in this paper. The feature of this topology is that the energy transfer among arbitrary batteries can be realized quickly by controlling switches, and the complexity of energy transmission path can be reduced. In order to equalize the battery in the whole State of Charge range and reduce the influence of inaccurate equalization caused by a single equalization variable, according to the characteristics of the Open Circuit Voltage - State of Charge curve, the piecewise equalization method is adopted, with voltage and State of Charge as equalization variables, and the Fuzzy Logic Control algorithm is designed to dynamically adjust the equalization current to reduce equalization time and energy loss. The topology and control strategy are analyzed in detail. Matlab/Simulink software is used to build the model and simulate it. The experimental results show that compared with the traditional Cuk equalization topology, the equalization topology proposed in this paper can shorten the equalization time by 22.17%. In addition, compared with the mean difference algorithm, the Fuzzy Logic Control algorithm improves the time efficiency by more than 30% and the energy efficiency by about 11% under static and charge-discharge conditions, demonstrating the feasibility of the balancing scheme.
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