极端环境下恒温晶体振荡器的传热过程仿真  

Simulation of Heat Transfer Process in an OCXO under Extreme Environment

作　　者：李纪康 彭慧丽 于德江 郑振荣[1] LI Jikang;PENG Huili;YU Dejiang;ZHENG Zhenrong(School of Textile Science and Engineering,Tiangong University,Tianjin 300387,China;Beijing Institute of Radio Metrology and Measurement,Beijing 100039,China)

机构地区：[1]天津工业大学纺织科学与工程学院,天津300387 [2]北京无线电计量测试研究所,北京100039

出　　处：《宇航计测技术》2024年第1期76-82,共7页Journal of Astronautic Metrology and Measurement

摘　　要：晶体是恒温晶体振荡器的核心部件,需要保持温度恒定不变,外部环境温度的巨大变化必将影响晶振输出频率信号的稳定性。根据恒温晶体振荡器的工作状态和机制,建立其在稳态下传热过程的数学模型,探究晶体在高低温环境下的热稳定性,重点分析不同环境温度下功率管输出功率对晶体温度的影响,并利用恒温晶体振荡器实际运行过程中的数据进行验证。结果表明通过仿真得到的数据与实测数据基本一致,当环境温度分别为-40℃、25℃和70℃时,要使稳定后的晶体温度恒定为85℃,相应功率管稳定后的输出功率应为3.95 W、1.42 W和0.74 W。通过调节功率管的输出功率来使晶体在极端环境下达到预设温度并保持恒定,进而使晶振有较高的频率稳定度和较低的相位噪声水平,保证高精度的时钟信号输出。The crystal is the core component of the oven-controlled crystal oscillator,which needs to keep the temperature constant,and the great change of the external ambient temperature will surely affect the stability of the output frequency signal of the crystal.According to the working state and mechanism of the OCXO,a mathematical model of the heat transfer process in the steady state is established,the thermal stability of the crystal in high and low temperatures is investigated,and the influence of the output power of the power tubes on the temperature at the crystal in different ambient temperatures is emphasized,and the data during the actual operation of the OCXO are used for verification.The results show that the data obtained through simulation are basically consistent with the measured data;when the ambient temperatures are-40℃,25℃and 70℃,respectively,the temperature at the stabilized crystal is 85℃,and the corresponding output power after stabilization of the power tubes is 3.95 W,1.42 W and 0.74 W.The output power of the power tubes is adjusted to make the temperature at the crystal constant.By adjusting the output power of the power tubes,the crystals can reach the preset temperature and keep it constant under extreme environments,so that the crystals can have high frequency stability and low phase noise level,and ensure the output of high-precision clock signals.

关 键 词：恒温晶体振荡器 传热性能 仿真分析 高低温环境 

分 类 号：TN752.2[电子电信—电路与系统]