Current limiting protection in spacecraft power system

A general description and the protection technologies of the spacecraft power system in terms of deep-space explore, global navigation and earth remote sensor and so on are presented. Base on these, protection system using LCL of spacecraft power system is introduced and some kinds of protection system based on LCL are analyzed and compared. The characteristics of these topologies are summarized and applications using LCL are recommended. The paper describes the principle and development state of the LCL and reports the realization of the digital LCL focusing on the design of inverse time over-current protection, current limiting, state latch and the reliability technology and gives the test results of the dynamic response in terms of current limit protection, inverse time over-current protection and the dynamic performances with different kinds of load. At the last, the method selecting the LCL and the circuits used in the protection instances are developed. The study results can provide reference for the design of the spacecraft power system, the next generation smart power system and reliability.