Research on High Efficiency Non-Isolated Push-Pull Converters with Continuous Current in Solar-Battery Systems

Abstract

In order to improve the output efficiency of solar cells and to extend the life span of batteries, the input currents of converters are required to be continuous. If low output voltage ripple is required at the same time, it is obvious that the application of basic two-order converters (such as Buck and Boost derived converters) will not be good enough. In this paper, a lot of non-isolated push-pull converters (NIPPCs) with continuous current will be introduced due to their lower current stress, higher efficiency and better EMC performance. By decomposing the converters into push-pull cells, inductor and free-wheeling diodes, two families of NIPPCs based on single inductor and coupled inductor separately are systematically generated. Furthermore, characteristics analyses for some of the generated converters are also shown in this paper. Finally, two prototypes based on the corresponding typical topologies are built in the lab to verify the theoretical outcomes.

Active damping method to reduce the output impedance of the DC–DC converters

“…That means the controller will be unstable when G vd has right half plane (RHP) zeroes, for example, boost and Superboost [16]. Hence this method is suitable for the converter whose transfer function G vd has no RHP zeroes, for example, Superbuck [17][18][19], HE-Boost and Weinberg [20,21].…”