The role of the inductance coil
Release time:
2023-09-20
blocking effect
Inductive Coil The self-induced electromotive force in the coil always contends with current changes in the coil. Inductance coil has a blocking effect on AC current. The size of the blocking effect is called inductive reactance xl, and the unit is ohm. Its relationship with inductance l and AC frequency f is xl = 2πfl, and inductors can be mainly divided into high-frequency choke coils and low-frequency choke coils.
Tuning and Frequency Selection
Inductance coil and capacitor in parallel can form lc tuning circuit. That is, if the natural oscillation frequency f0 of the circuit is equal to the frequency f of the non-AC signal, the inductive reactance and capacitive reactance of the loop are also equal, so the electromagnetic energy oscillates back and forth in the inductance and capacitance, which is the resonance phenomenon of the lc loop. At resonance, the inductive reactance and capacitive reactance of the circuit are reversed. The inductive reactance of the total circuit current is the smallest and the current amount is the largest (referring to the AC signal with f = "f0"). The lc resonant circuit has the function of selecting frequency and can select the AC signal with a certain frequency F.
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