大功率单刀双掷开关振动耐受性能试验研究

Experimental Study on the Vibration-tolerance Performance of a High-power SPDT Switch

目的为保证某型大功率开关振动耐受性能满足应用环境的要求,对该型大功率单刀双掷开关的振动耐受性能进行研究。方法通过振动模拟试验,对其实际工作能力及振动极限进行验证和摸底,在实施开关直流信号随机振动试验和大功率射频信号随机振动试验的基础上,首次实施开关直流信号步进振动试验、大功率射频信号步进振动试验。利用等效电路方法建立单刀双掷开关信号传输路径模型,对开关振动瞬断所导致的射频传输性能影响进行理论分析。结果在直流信号试验和大功率射频信号试验中,A开关在x,y向试验中出现了多次瞬断,最长瞬断时间为63.6μs,B开关顺利通过所有试验。同一频率下,寄生电容越小,隔离度越高;同一寄生电容下,频率越高,隔离度越小。结论实现了开关振动性能的考核和摸底,该研究为大功率开关的可靠性设计和系统的减振设计提供了数据支撑和解决途径。

Objective In order to ensure that the high power switch vibration tolerance performance can meet the requirements of the application environment, the study on vibration tolerance performance for the high-power SPDT Switch was proposed in this paper. Methods Based on the implementation of switching DC signal random vibration test and high power RF signal random vibration test, the actual working ability and vibration limits were verified. The switching DC signal of step vibration test and high power RF signal of step vibration test were implemented for the first time. The SPDT transmission model established using the equivalent circuit method was applied for theoretical analysis on the effect of RF transmission transient fault caused by vibration. Results In DC signal and high power RF signal test, several short breaks occurred in the x and y direction for switch A, and the longest time of transient fault was 63.6 μs, whereas switch B passed all tests. At the same frequency, smaller parasitic capacitance meant higher isolation degree. With the same parasitic capacitance, the higher the frequency, the smaller the isolation degree was. Conclusion This paper realized the assessment of the vibration performance of switches and provides data support and solving method for the reliability design of high-power switch and vibration isolation design of the system, and therefore gives a good guidance.