摘要：A 28 V-half-regulated power bus topology and an integrated PCDU (Power conditioning and Distribution Unit) were adopted to meet the energy demand for the Chang'e 4 relay *** paper first introduces the mission features and composition of the PSDS (Power Supply and Distribution System) for the Chang'e 4 relay *** to this satellite's unusual orbit,operational mode and project restrictions,special analysis and design was conducted on the PSDS from the perspective of weight-reduction,power management,and reliability and so *** low temperature storage of SA (Solar Array) was considered and how the antenna affects the SA was analyzed.A new kind of high-specific-energy 45 Ah (Ampere-hour) battery cell was used for the first *** make sure that the satellite would successfully pass the long shadow zones,a 100% DOD (Depth of Discharge) experiment was carried out on the *** the sunlight is almost always available and there are very few times for the battery to charge or discharge,battery care to extend its lifetime is also *** is a device that integrates power conditioning and power distribution in one *** PCDU on Chang'e 4 relay satellite can output more power with less weight because of the adoption of a 28 V-half-regulated power bus topology which was also used for the first time and used lighter material for its mechanical *** under low temperature on PCDU was conducted as well and a hot backup equalizing charge technique which is beneficial to keep performance of the battery is *** power distribution module,which is a module of PCDU,enhances the power utilization security by utilizing a static impedance measurement and build-in-test to avoid possible short *** for EED (Electrical Explosive Device) module,a protection plug was specially designed and three switches with different functions were connected in series to prevent the EED from exploding by *** addition,the allowable