How does PQ type power inductor utilize force field to store electrical energy?

PQ type power inductors store electrical energy mainly through magnetic fields rather than force fields.

When current passes through a PQ type power inductor,a magnetic field is generated around the inductor according to the law of electromagnetic induction.Inductors are generally composed of coils wound around a magnetic material(such as ferrite)core.The change in current in the coil will cause a change in the magnetic field.

From a microscopic perspective,when current flows through a coil,electrons move within the coil.Due to the magnetic effect of current,a magnetic field is generated around each small section of wire.These small magnetic fields overlap with each other,forming a strong magnetic field around the core of the inductor.According to the definition of inductance,inductance(L)is related to the current passing through it(I)and the magnetic flux generated(Φ),and its relationship isΦ=L×I.

During the charging process,as current flows into the inductor,a magnetic field gradually builds up.Electric energy is stored in the form of magnetic field energy in the magnetic field around the inductor.The calculation formula for magnetic field energy(W)is W=1/2×L×I².This means that the larger the inductance value(L)and the current(I),the more magnetic field energy is stored.

When the current in the circuit where the inductor is located changes,such as a decrease in current,according to Lenz's law,the inductor will generate induced electromotive force to hinder the change in current.This induced electromotive force will drive the current to continue flowing,gradually releasing the magnetic field energy and converting it into electrical energy to return to the circuit.

Taking a simple switch power supply circuit as an example,when the switch is closed,current flows into the PQ type power inductor,and electrical energy is converted into magnetic field energy and stored.When the switch is turned off,the induced electromotive force generated by the inductor will cause the current to continue passing through other components(such as diodes,etc.),releasing the stored magnetic field energy and maintaining the stability of the output voltage,achieving efficient utilization of electrical energy.