Abstract: In view of the widely applications of push-pull based converters in aircraft power supply and the superiority of the topology with continuous input and output currents,this paper proposed a concept of single-inductor push-pull based topologies with continuous input and output currents.Four new kinds of non-isolated push-pull cells are deduced from traditional push-pull cells.The circuit configurations based on these four kinds of push-pull cells are also derived,three of them are firstly proposed.These topologies can be divided into the Smart type and the Weinberg type according to topology structures and control methods.Sags exist in the low ripple current of the Smart topology and spikes exist in that of the Weinberg topology,while the problem isn’t exist in proposed topologies.The push-pull-based topologies can be used for battery discharge regulators（BDR） or battery charge regulators（BCR） based on the condition that the bus current should be of low-ripple.The advantages and disadvantages of topologies are achieved by comparing characteristics,which can provide a theoretical support for DC-DC converters used in PCU.In addition,the experimental results based on one of the proposed topologies are given to verify the validity of theoretical analysis.