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Inductor manufacturers share ways to reduce chip inductor losses
Apr 18, 2018

Inductor manufacturers share ways to reduce chip inductor losses


The loss of SMD inductor mainly comes from two aspects of core loss and coil loss, and the magnitude of the loss of these two aspects needs to be judged according to different circuit modes. Among them, the core loss is mainly due to the alternating magnetic field in the core material, and the loss it generates is a function of the operating frequency and the total magnetic flux swing (ΔB), which greatly reduces the effective conduction loss. The coil loss is due to the energy loss caused by the change of magnetic energy. It will reduce the strength of the magnetic field when the power inductor current decreases.


1. The core loss produced in chip inductors will decrease as the loss of the inductor core increases, allowing the loss of the copper wire, and it will also bring about the same surge in flux of the inductor core material. Therefore, when the switching frequency rises above 500 kHz, the inductor core loss and the winding AC loss can greatly reduce the allowable DC current in the inductor.

2. The loss of the coil inductance of the chip inductor is mainly reflected in the loss of the copper wire. Therefore, if you want to reduce the loss of the copper wire, you must reduce it when the loss of the inductor core increases, and continue until the losses are equal. The best case is that the loss is stable at high frequencies and equal, and allows maximum output current from the magnetic structure.

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