RLC混联电路中串并联谐振判断方法

Judging method of resonant frequency in RLC series-parallel circuit

针对谐振电路中谐振频率判断方法不明确的问题,提出用阻抗或导纳虚部为零来对应判断串并联谐振。从具有普遍性的RLC混联结构入手,对电路进行结构直观判断,用数学推导,通过Multisim进行仿真分析,对实例进行验证。为应用电路中谐振点进行判断提供可靠的依据。

The judging method of resonant is not given in lots of literatures when resonant occurred in RLC series-parallel circuit.For this,a method was proposed that judging the resonant only through zero setting imaginary part of the impedance or admittance.First of all,intuitive judgment of resonant was given when the circuit structure is unit.Then,theory of judgment was given based on zero setting of the impedance and admittance.At last,the circuit was simulated under Multisim,and one example was analyzed.The results showed that resonant judgment should be based on theory analyzing that zero setting imaginary part of the impedance or admittance not on circuit structure.This conclusion has given a reliable basis of judging resonant for engineers.