The role of power inductors

(1) Choke: the self-induced electromotive force in the coil is always opposed to the current change in the coil. It can be divided into high frequency choke coil and low frequency choke coil.

(2) Tuning and frequency selection: The resonant circuit has the effect of selecting the frequency, and can select the AC signal of a certain frequency f.

We should know that there are two kinds of power inductors: open power inductors and closed power inductors

1, open power inductance

2, closed power inductance

In the circuit, it mainly plays the role of choke, filter and oscillation.

Power inductor tuning and frequency selection function: inductor coil and capacitor in parallel can form LC tuning circuit. That is, the natural oscillation frequency f0 of the circuit is equal to the frequency f of the non-AC signal, then the inductive reactance and capacitive reactance of the circuit are equal, so the electromagnetic energy oscillates back and forth in the inductor and capacitor, which is the resonance phenomenon of the LC circuit