基于自由轴法的RLC测量电路

一种通用的电阻、电感和电容的测量电路,基于伏安法测阻抗原理,采用自由轴法确定相位参考基准。对于小容量电容(2pF下),采用并联等效方式;对于大容量电容(2pF以上),采用串联等效方式。前者的有源整流器输入接到半桥电压支路A1上,振荡器供给半桥测试回路恒压的正弦波激励信号。后者的有源整流器输入接到半桥电压支路A2上,振荡器供给半桥测试回路恒流的正弦波激励信号。

RLC Measuring Circuits Based on Free-Axis Method

A kind of universal measuring circuit for resistance,inductance and capacitance is designed,the principle is based on volt-ampere method for impedance measurement,and the phase referenced benchmark is determined by free-axis method.Concerning the small capacitance(under 2pF),the parallel-connection equivalent mode is adopted,and as to the large capacitance(above 2pF),the series-connection equivalent mode is adopted.Powered rectifier input of the former is connected to the half-bridge voltage branch A1,and the oscillator supplies the half-bridge circuit with an invariable voltage sine signal.While powered rectifier input of the latter is connected to the half-bridge voltage branch A2,and the oscillator supplies the half-bridge circuit with an invariable current sine signal.