Analyze the impact of high temperature environment on inductance

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Analyze the impact of high temperature environment on inductance [Copy link]

Do different magnetic materials have different temperature coefficients? Yes, magnetic materials have different temperature coefficients, but generally speaking, the higher the temperature, the higher or lower the inductance value? Inductance L=4*3.14*0.0001*N*N*Ae/(lg+le/u); N represents the number of turns; Ae represents the effective cross-sectional area of the center column; le represents the effective magnetic path length. In the above formula, only u may change. When it approaches the Curie temperature, it first increases a little. When the temperature continues to rise, u decreases sharply. At this time, the inductance also decreases sharply. The inductor core is saturated, and the inductance decreases sharply. The question is, what is this Curie temperature? The SPC of the inductor used can reach up to 145 degrees. Within the range of 70-145 degrees, should the inductance value decrease? ” The Curie temperature is related to the core material, generally around 160-260 degrees. Please refer to the core specification for details. If the current passing through the high temperature is large, will the inductance increase? Basically, the inductance of the gapped inductor (including the toroidal inductor with uniform air gap) is constant. Unless the Curie temperature is exceeded or too much current passes through, the inductance may decrease sharply. The inductance of the gapless inductor is proportional to its magnetic permeability, so it will change appropriately with the temperature. When it reaches the Curie temperature, the inductance will also decrease sharply. The inductance of the air-core inductor will not change due to the current size and temperature. Generally, the magnetic permeability u of the magnetic cores we commonly use decreases with increasing temperature, which also leads to a decrease in inductance. It can be remembered that in extreme cases, the inductance is easy to saturate at high temperatures, and the inductance is reduced to a very small value when saturated.