RLC暂态过程震荡峰位对测量时间常量的影响

Influence of transient vibration peaks on time constant measurement of RLC circuit

在测量RLC电路暂态过程时间常量时,通常测量电容电压的欠阻尼震荡峰值间接测量时间常量.欠阻尼震荡峰值往往简单地近似为sin(ωdt+φ)=±1时的电容电压值.讨论了这一近似峰位与准确峰位的区别与联系,结果表明由近似峰位得出的时间常量不存在近似性,与由准确峰位得出的时间常量是一致的.

When measuring the time constant of RLCcircuit in transient process,the time constant was usually obtained indirectly by measuring the voltage of the underdamping vibration peaks of the capacitance.The underdamping vibration peaks was always approximated by the voltage when sin（ωdt＋φ）=±1.The difference and relationship between the approximate peak and the exact peak were discussed in this paper.The result showed that the time constant worked out from the approximate peak was not an approximate result.It was in accordance with the time constant obtained from the exact peak.