对谐振电路品质因数定义的再认识
On Re-exploration of Definition of Quality Factor in Resonance Circuit
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摘要: 对谐振电路品质因数已有的几种定义进行了讨论，这些定义存在着适用范围不普遍、物理概念不够严谨的情况。因此提出品质因数的新定义：品质因数等于谐振电路的电感或电容储能的峰值与谐振电路在一个周期消耗的能量之比的2π倍。这个定义的物理概念清晰严谨，应用方便，适用于线性谐振电路品质因数的计算。并用这个新定义计算了RL与C并联谐振电路的品质因数，讨论了几种计算方法。Abstract: Some existed definitions of the quality factor for resonance circuit have been discussed because there are problems with those definitions ,which are not universal in use ,and which are not strict in physi-cal conceptions .A new definition of the quality factor for resonance circuit has been given ,w hich means that the quality factor is equal to 2πtimes the ratio of the peak stored energy value of the inductance or ca-pacitance to the energy consumption of the circuit in one period .T he new definition has a distinct and strict physical conception ,and is convenient in application w hich is applied to the calculation of the quality fac-tors for linear resonance circuits .The new definition is used to calculate the quality factor of RL and C par-allel resonance circuit ,and various algorithms have been discussed .
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Key words:
- resonance circuit，quality factor，definition /
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