离子推进器屏栅电源负载突变分析  

Analysis of Sudden Load Changes in Ion Thruster Screen Grid Power Supply

作　　者：崔倩 周洁敏[1] 洪峰[2] 郑罡[1,3] CUI Qian;ZHOU Jie-min;HONG Feng;ZHENG Gang(Nanjing University of Aeronautics and Astronautics,Nanjing 211106,China;不详)

机构地区：[1]南京航空航天大学民航学院,江苏南京211106 [2]南京航空航天大学电子信息工程学院/集成电路学院,江苏南京211106 [3]南京军区南京总医院医学影像科,江苏南京210016

出　　处：《电力电子技术》2023年第1期72-75,78,共5页Power Electronics

摘　　要：离子推进器在工作过程中需要进行打火操作,突变负载会对电源处理单元(PPU)造成过压过流等影响。为满足离子推进器PPU负载突变的需求,选择PPU中的屏栅电源作为研究对象,结合全桥LLC谐振变换器拓扑,采用平均大信号建模法,建立了全桥LLC非线性状态空间方程,并通过方程中快慢变量的近似处理,推导出平均大信号模型,通过仿真验证了平均大信号模型与状态空间方程基本一致。据此大信号模型设计了控制器,通过Matlab/Simulink仿真和实验验证了控制的有效性。所研制的原理样机可以实现软开关和负载突变下的快速调节,最低效率为97.1%,输出稳定性较高,可以提升推进器电源模块的可靠性。The ion thruster requires firing operation during operation,and the sudden load changes will cause overvoltage and over-current effects on the power processing unit(PPU).In order to meet the demand of sudden load changes in PPU of ion thruster,the screen grid power supply in PPU is selected as the research object,by combining the topology of full-bridge LLC resonant converter,the mean large signal modeling method is used to establish the nonlinear state space equation of full-bridge LLC,and the model is derived by approximating the fast and slow variables in the equation.It is verified by simulation that the average large signal model is consistent with the state space equation.The controller is designed according to this large-signal model,and the effectiveness of the control is verified by Matlab/Simulink simulation and experiment.The developed principle prototype can realize fast regulation under soft switching and load abrupt changes,with a minimum efficiency of 97.1% and high output stability,which can improve the reliability of the thruster power module.

关 键 词：离子推进器屏栅电源 负载突变 平均大信号模型 

分 类 号：TN86[电子电信—信息与通信工程]