Power Control Distribution Unit Protection Circuit Design of FORMOSAT-5 Satellite

摘要

The power control and distribution unit (PCDU) in FORMOSAT-5 satellite, acts as the satellite power and allocation center, similar to human heart. The main functions are to condition energy from the solar arrays and distribute power for all subsystems on the satellite. The PCDU s protection circuits provide monitoring and isolation according to voltage and current of internal circuit system and external power users. The voltage protection circuits are under-voltage-lockout (UVLO) detector for the main bus, over voltage (OV) detector for satellite battery, and under voltage (UV) protector for DC-DC converters. The portion of current protection circuit is over current (OC) protector for external power users and DC-DC converter system. This paper describes protection working methods and the reliable circuit design implementation.