华侨大学学报（自然科学版）2018，Vol.39Issue(2)：240-245,6.DOI:10.11830/ISSN.1000-5013.201706043
低压开关触头压降取样电路的设计
Design of Sampling Circuit for Measuring Contact Voltage Drop of Low Voltage Switch
摘要
Abstract
Aiming at the problem that the contact voltage difference of low voltage switch between making and breaking is so large that the instrumentation is difficult to balance the precision and safety issues,a new method of passive circuit sampling for measuring the contact voltage drop was proposed by using the steady voltage characteristics of the Zener diode.On this basis,the influence of the current-limiting resistor and the Zener diode in the contact voltage drop sampling circuit was analyzed theoretically and the selection rules were determined.The detection circuit characteristic test was used to detect the measurement error of the sampling circuit.Through the test of frequency characteristic,the attenuation and distortion of different frequency harmonics in the sampling circuit were detected.The practical application of the sampling circuit was tested by simulating the condition test.The experimental results show that the contact voltage drop sampling circuit of the low voltage switch can accurately measure the contact voltage drop and ensure the safety of the measuring instrument.关键词
低压开关/触头压降/检测电路/取样电路Key words
low voltage switch/contact voltage drop/detection circuit/sampling circuit分类
信息技术与安全科学引用本文复制引用
彭长青,尚荣艳,方瑞明..低压开关触头压降取样电路的设计[J].华侨大学学报（自然科学版）,2018,39(2):240-245,6.基金项目
国家自然科学基金青年科学基金资助项目(51707068) （51707068）
福建省厦门市科技计划项目(3502Z20153029) （3502Z20153029）
