Research on Magnetic Integration of Push-Pull Converter for Aerospace Power Supply

With the rapid development of China's space industry and the continuous promotion of deep space exploration and other major projects in the future, the performance requirements for space vehicle power supplies are becoming increasingly high. Due to the separation of inductive core, the double-end converter commonly used in aerospace DC/DC power modules is still large in weight and size, and there is still room for improvement in efficiency. In order to solve this problem and meet the special needs of module power supply in the space field, magnetic integration technology has been introduced into the space field in recent years. Based on the push-pull topology, the operation mode of the ensemble method with the secondary inductance winding removed is analyzed in detail. The design process of the key components used in aerospace is calculated, and the solution of increasing the number of turns when the magnetic flux density is too high is given. By using ANSYS software to build a simulation model to conduct co-simulation and analyze the results. For the magnetic integrated converter with 50V input and 5V output and 120W, the circuit simulation efficiency is increased to 88.9%, and can ensure that the magnetic flux density in most areas of the magnetic parts is less than the saturation magnetic flux density of the material 530mT. The validity and feasibility of the proposed method in theory and practice are verified.