High Reliable Power Conversion System with Active Battery Balancing Capability

This paper introduces highly reliable power conversion system with active battery balancing capability using switch set. This multifunctional topology reduces redundant components and optimizes the operation of the power conversion system. Based on the reliability study, the proposed topology is more reliable and has a longer mean time to failure than conventional topology. As a multiple-input power conversion system, bidirectional operation with burst mode operation is adopted to achieve simple and robust equalization. Peak current limit of the optimal burst mode operation and energy transferred between cells are analyzed and derived. To verify the proposed topology, a prototype circuit with four series-connected cells and a set of GaN switches are made. The experimental results are done for cells of 4V and 2.8V, respectively.