What is the reason why the current in the chip inductor cannot be abruptly changed?

The current in the inductor cannot be abruptly changed, because the essence of the role of the chip inductor in the circuit is to convert the changing current flow process into an electromotive force that hinders the current change. Under the condition that the current flow in the DC circuit remains constant, SMD inductors obey Ampere's right-hand rule for the magnetic field generated when current flows, forming a constant magnetic field.

If the magnetic field does not change, the chip inductor will not generate an induced electromotive force that hinders the change of the current. The chip inductor is equivalent to a wire in the DC circuit. Small.

However, when the time-varying current flows through the conductor in the chip inductor, the magnetic field around the conductor in the chip inductor will also change accordingly. In order to prevent the changing trend of the surrounding magnetic field, the chip inductor will induce a The induced electromotive force that is opposite to the current change trend, thus hindering the current change, and the degree of resistance is related to the speed of the current change, or the frequency of the current change. At the moment when the switch is just turned on, the current grows from nothing, and the magnetic field generated by the current also grows from nothing.

In order to prevent this change of the magnetic field, a reverse electromotive force is generated in the chip inductor, and due to the generation of this reverse electromotive force, the current cannot become the maximum value all at once. On the contrary, when the current that has become the maximum value is suddenly cut off, the magnetic field will also change accordingly. In order to prevent this change, the chip inductor will generate a high forward voltage in an attempt to maintain the magnetic field and current unchanged.