《Table 1 Configuration of power supply and distribution system》

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《嫦娥四号中继星供配电系统设计与应用（英文）》

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The schematic diagram of PSDS of Chang’e 4 relay satellite is shown in Figure 1.The 28 V-half-regulated power bus topology was adopted to reduce the weight and volume of PCDU effectively.The power from SA is regulated by the PCDU via S4R circuits in the sunlight zone so that a steady bus voltage is established and the battery could be charged[2].This topology which is much simpler than an all-regulated one would let the battery supply all the devices on this satellite directly through the discharging switches at a very high efficiency without BDRs（Battery Discharge Regulator）.The configuration of PSDS is listed in Table 1.