基于S3R架构的电源控制器优化设计与可靠性

The optimizal design and reliability of power conditioning unit based on S3R topology

摘要:

针对空间用电源控制器工作环境恶劣,可靠性设计要求高的问题,提出一种对电路进行稳健设计和优化的方法．在建立的顺序开关分流调节器(S3R)数学模型基础上,通过参数扫描分析,实现了对电路母线电容参数的优化;考虑元器件初始偏差,温度老化等对电路器件的影响,采用蒙特卡洛分析和应力分析,实现了对电路工作在最坏环境时,母线输出性能和分流器件降额的验证;最后,基于三级S3R电路模拟了两种故障模式．仿真结果表明,电路能够通过越级工作,使得母线电压输出稳定,纹波符合规定．

Abstract:

Considering the space power conditioning unit (PCU) needs high reliable design,especially for it works in harsh environment, a robust design and optimal method is proposed. Firstly,the mathematical model of sequential switching shunt regulator(S3R) is shown to be suitable for regulated bus power systems. Secondly, optimize the bus capacitor parameter by the parameter sweep analysis. Thirdly, when all the components change simultaneously in the worst case, the performance of the S3R circuit meets the design requirements and the shunt component meets the derating requirements in the Monte Carlo analysis and stress analysis. Finally, simulate two failure modes: the load changes in pulse mode and the current supply of the second-stage solar array is zero,the simulation results show that the output of the bus voltage is stable and ripples in the specified range.