Research on a Power Supply Scheme of Composite Bus for SAR Satellite

Abstract

When the SAR satellite load is working, the high-frequency pulse and high power will cause disturbance to the power supply bus. In order to solve this problem, the traditional SAR satellite's power sub-system adopts the method of independent power supply for the satellite load and the platform, that is, one bus bar provides power for the load, and another bus bar provides power for the entire satellite platform load. Although this method can solve the problem of the entire satellite bus disturbance, however, it will increase the weight and volume of the power system, which is not conducive to the miniaturization and lightweight development of the entire satellite. This paper proposes a power supply scheme for the composite busbar of SAR satellites below 15kW. The primary busbar supplies power to the load, and the primary busbar is converted to platform power supply. The converter adopts isolation and high-power filtering technology to ensure the power supply busbar’s power supply. For power quality, the entire system only needs to be equipped with a set of batteries. Compared with the traditional design, the power quality ratio is improved. This power supply scheme can provide design reference for the subsequent high-power SAR satellite power supply system.