Qual é a razão pela qual a corrente no indutor do chip não pode ser alterada abruptamente?

A corrente no indutor cannot be abruptly changed, because the essence of the role of the chip indutor 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 indutors 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 indutor will not generate an induced electromotive force that hinders the change of the current. The chip indutor is equivalent to a wire in the DC circuit. Small.

However, when the time-varying current flows through the conductor in the chip indutor, the magnetic field around the conductor in the chip indutor will also change accordingly. In order to prevent the changing trend of the surrounding magnetic field, the chip indutor 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 indutor, 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 indutor will generate a high forward voltage in an attempt to maintain the magnetic field and current unchanged.