How SMD Inductors Reduce Loss

How SMD Inductors Reduce Loss

The loss of the chip inductor core mainly comes from the core loss and the coil loss, and the magnitude of the loss in these two aspects needs to be judged according to its different circuit modes. Among them, the core loss is mainly caused by the alternating magnetic field in the core material, and the loss it produces is a function of the operating frequency and the total magnetic flux swing (ΔB), which greatly reduces the effective conduction loss. Coil losses are energy losses due to changes in magnetic energy, which reduce the strength of the magnetic field as the power inductor current drops.

The method of reducing the loss of the inductor core:

1. The core loss generated in the inductor core will decrease with the increase in the inductor core loss, and the allowable copper wire loss will decrease, and it will also bring about a surge in the flux of the same inductor core material. Therefore, when the switching frequency rises above 500 kHz, the inductor core losses and winding AC losses can greatly reduce the allowable DC current in the inductor.

2. The loss of the inductor core in the coil is mainly manifested in the loss of the copper wire. Therefore, in order to reduce the loss of the copper wire, it must be reduced when the loss of the inductor core increases, until the losses are equal. The best case is that the losses remain constant at high frequencies and allow maximum output current from the magnetic structure.

The above is the loss of chip power inductors shared by PAGOODA engineers.