Long Life Design Method for Highly Reliable Charge and Discharge Regulator

The leapfrog development of space power supply products brings new challenges to reliability engineering. Space power controllers have long life and high reliability requirements due to its complex and precise composition, long mission time, high mission success rate and difficult to maintain during orbit operation. Once failure occurs, it will directly affect the completion of the mission. The service life of space power controllers is an important technical index. Generally, the service life of space power controllers need to meet about 20 years. The traditional life evaluation methods are far from meeting the verification requirements of long life index. In order to effectively evaluate the life of the power controller and provide support for the long time in-orbit operation of the spacecraft power subsystem, a long-life design method is proposed in this paper. Firstly, based on the theory of stress cumulative damage model, a method to quickly evaluate the reliability and life level of the current product is obtained. Secondly, according to the structural characteristics, historical fault information, service environment and maintenance mode of charge and discharge regulators, the main fault modes and the most critical excitation environment factors affecting the life of charge and discharge regulators are obtained. Finally, the controller is tested by this design method. The experiments results verify the prototype design is rational and feasible.