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How to reduce inductor core loss

How to reduce inductor core loss

2021-11-02

Everyone knows that inductive magnetic cores are a product that is used in many electronic products, such as mobile phones, MP3, MP4, computers, converters, transformers, and LED TV displays. And everyone should also know that electronic products produce a certain amount of loss during use, and inductor cores are no exception.However, if the loss of the inductor core is too large, it will lead to a reduction in the service life of the inductor core, and in serious cases, it will also affect the normal operation of the product using the inductor core. So how should we reduce the loss of the inductor core?


What is the reason for the loss of the inductor core? Because the loss of the chip inductor core mainly comes from the core loss and the coil loss, and the size 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. The loss it generates is a function of the operating frequency and the total magnetic flux swing (ΔB), which will greatly reduce the effective conduction loss. The coil loss is the energy loss caused by the change of magnetic energy. It will reduce the strength of the magnetic field when the power inductor current drops.


And the method to reduce the core loss:


1. The core loss generated in the inductor core will decrease with the increase of the inductor core loss and the allowable copper wire loss, and it will also bring the same inductance core material flux to surge. Therefore, when the switching frequency rises above 500 kHz, the inductor core loss and winding AC loss 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, if you want to reduce the loss of the copper wire, you must reduce the loss of the inductor core when the loss of the inductor core increases, and continue until the losses are equal. The situation is that the losses remain stable and equal at high frequencies and allow a large output current to be obtained from the magnetic structure.


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