Active battery balancing circuit with AC-link technique based on current-fed-push-pull converter
In this paper, a charge equalizer for series-connected battery strings based on current-fed-push-pull converter using AC-link technique is presented. The proposed charge equalizer can redistribute the energy directly between battery modules with AC-link technique and achieve balance quickly by simple control. The circuit efficiency can be improved because the rectifier diodes are eliminated. In addition, only one driving circuit for the power switches is required and can expand the equalizer according to the number of batteries. The proposed charge equalizer has the advantages of small size, modular design, low-cost. Finally, the simulation results are provided to verify the feasibility of the proposed charge equalizer.