基于制冷控制器的在轨变频方案设计  

Design of in-orbit frequency conversion scheme based on refrigeration controller

作　　者：田园 李寅龙[1] 谢妮慧 史翠红[1] 翟耘萱 刘成 TIAN Yuan;LI Yinlong;XIE Nihui;SHI Cuihong;ZHAI Yunxuan;LIU Cheng(Beijing Institute of Space Mechanics&Electricity,Beijing 100094,China)

机构地区：[1]北京空间机电研究所,北京100094

出　　处：《航天器环境工程》2023年第3期249-256,共8页Spacecraft Environment Engineering

基　　金：装备发展部中俄联合研制项目(编号:03CN19018/2021GWKJ-5Y-LZYD)。

摘　　要：为满足空间大功率斯特林制冷系统在轨环境复杂工况下的制冷需求,需解决制冷控制器在轨期间实时变换驱动电压频率的问题。文章提出一种基于自然采样法的变频策略:通过查找表法和1/4周期正弦波复用,生成无符号的正弦调制波;通过并行进程同步生成无符号的三角载波;通过二者的交叉比较,生成按照正弦规律变化的占空比,基于冲量等效原理,经过滤波得到SPWM波。采用迭代除法的方式实现指令模式下的变频设计,通过状态机交替转移的方法实现自动模式下的变频设计,两种模式的变频精度均为0.1 Hz。该方案的可行性通过了仿真和系统试验验证,并通过了红外光学相机制冷控制器的在轨验证。In order to meet the refrigeration demand of space high-power Stirling refrigeration system under complex working conditions in orbit,it is necessary to solve the problem of real-time conversion of driving voltage frequency of refrigeration controller in orbit.In this paper,a frequency conversion strategy based on natural sampling method was proposed.An unsigned sinusoidal modulation wave was generated by looking up table method and multiplexing quarter-cycle sinusoidal wave.An unsigned triangular carrier was created synchronously by parallel process.And the duty cycle changing according to sinusoidal law was generated through cross comparison.Based on impulse equivalence principle,SPWM wave was obtained by filtering.The frequency conversion designs in command mode and in automatic mode were realized by means of iterative division and state machine alternating transfer respectively.The frequency conversion accuracy of both modes reaches 0.1 Hz.The feasibility of this scheme has been verified by simulation and system experiments,as well as on-orbit verification of the refrigeration controller of infrared optical camera.

关 键 词：斯特林制冷机 空间制冷 在轨变频 迭代除法 状态机 

分 类 号：V443.34[航空宇航科学与技术—飞行器设计]