Loss of inductor coil

The topic of loss of Buck converter is now about inductor. It has two functions in Buck circuit, one is energy storage and the other is filtering. Energy storage uses its inertia, and filtering also uses it. Because any change of the current flowing through the inductor will cause the change of its magnetic field, the changing magnetic field will cause the generation of induced electromotive force, and the induced electromotive force will form a current in the opposite direction of the original current change to counteract its change, and finally play the role of stabilizing the current, so this inductor is like an energy storage element, which is difficult to store and difficult to release.

When the current iL flows through the inductor with an inductance of L, the energy stored in it is

If the inductor is a pure linear element, as long as the current flowing through the inductor is infinitely increased, we can get an energy storage device with infinite capacity, but unfortunately this is not true, because as the current increases, the inductance of the inductors