大学物理 ›› 2010, Vol. 29 ›› Issue (8): 41-41.

• 著者文摘 • 上一篇    下一篇

RC电路时间常数的电压对称法快速测量

龙姝明[1] 王凤华[2] 杨俊海[2] 刘全一[2]   

  1. [1]陕西理工学院物理系,陕西汉中723000 [2]陕西理工学院物理系电信07级,陕西汉中723000
  • 出版日期:2010-08-25 发布日期:2010-08-20

Voltage symmetry method for fast measuring RC time constant of the circuit

  • Online:2010-08-25 Published:2010-08-20

摘要: 研究发现,在因果周期方波信号激励下,一阶动态电路的稳态响应是因果周期信号.设方波信号电压的最大值u0,电容电压的最大值uCmax和最小值uCmin满足关系u0-uCmax=uCmin.电容电压波形关于时间轴有特殊的对称性.利用RC电路稳态响应的电压对称性,可导出电路时间常数τ的快速测量方法和计算公式,为电容量测量提供可靠的快捷方法.

关键词: 一阶动态电路, 稳态响应, 时间常数, 对称性

Abstract: The steady-state response of the first-order dynamic circuits is causal periodic signal in the causal periodic square wave signal stimulus.The maximum value of square-wave voltage is u0,and the maximum and minimum values of the capacitor voltage are uCmax and uCmin,they obey a relation: u0-uCmax=uCmin.The waveform of capacitor voltage on the time-axes has special symmetry.By using the steady-state reponse of RC circuit voltage of symmetry,we can export the circuit time constant τ,and the formula for capacitance measurements provides a fast and reliable way.

Key words: first-order dynamic circuits, time constant, steady-state response, symmetry

中图分类号: 

  • TM934.2