Improving the accuracy of your SPICE simulations of powder cores by modelling inductor’s variable saturation

Improving the accuracy of your SPICE simulations of 
powder cores by modelling inductor’s variable saturation
Many users describe the inductance of their choke by a constant value in circuit simulations. For some core materials, this is a suitable assumption, as the inductance remains constant until the saturation point of the choke is reached.

Powder cores are different; even the smallest current can affect the inductance of the material. As a result, the inductance is reliant on the current and where the current changes, so must the inductance.

Many designers use an average value to gain an acceptable degree of accuracy but the overall result is only identified when a design enters into the prototyping stage with physical hardware. This requires additional time and resource, especially with designs which then fail.

In this paper, we explain how the change in inductance from applied current can be described mathematically and be considered in a circuit simulation to improve design accuracy, based on the choke design or measurements.



 

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