LAUSR

Due to the complexity of driving conditions and the increase of the driving range of electric two-wheelers and three-wheelers vehicles, the power battery string is in a long-period unbalanced discharge state, which affects the power output and even causes certain safety risks. A compact-size multi-winding transformer-based discharge equalizer is proposed to solve these problems and minimize the impact on the system volume by sharing the primary inductor with a boost discharger. When the boost converter is powering a load, the multi-winding transformer equalizer is driven by utilizing the square wave voltage generated on the inductor in the boost converter and produces multiple identical voltage levels to achieve voltage balance. Thus, the automatic balance can be achieved with only one winding and one diode for each module. An experimental prototype containing four batteries was established to verify the feasibility of the proposed method. Moreover, a quantitative comparison shows the proposed method obtain a more compact-size equalizer because of no need for a separate transformer, compared with the traditional equalization method based on the transformer.