AUTHORS:Qian Chen*a, Peng Qiu*, Yi Lu*, Jinpei Du**, Jiayi Wu***, Haihong Yu*,

Introduction

 A power conditioning unit (PCU) is comprised of the main error amplifier (MEA), the shunt Regulator (SR), the battery charge regulator (BCR), the battery discharge regulator (BDR), and telemetering/telecontrol (TM/TC) [1–5]. PCU balances the energy between each unit to keep the Bus Voltage Constant so that the electrical equipment of satellites can obtain stable power from the main bus. When the satellites cannot get enough energy from the solar battery array in the shadow region or sunshine region, the batteries provide energy for the bus to keep bus voltage constant. BDR plays an important role during this process. Our aim is to study a highpower and high-efficiency boost converter that is easy to expand and realize current-sharing to achieve excellent bus performance. Efficiency, complexity, and linearity play an important role in choosing the topology of the BDR. The normal boost converter is not suitable for BDR because of its low efficiency, instability, and discontinuous output current. So far, the topologies that have been used in BDR are [6–8] phase-shift full bridge (PSFB), Superboost, Smart Add on, HE-Boost, and Weinberg.