How to avoid saturation of the frequency dividing inductor?

The saturation of the frequency dividing inductor is a common phenomenon, which will cause the performance of the inductor to degrade or even fail. Here are some ways to avoid crossover inductor saturation:

Select the appropriate core material: Choosing a core material with high magnetic permeability and saturation flux density can effectively avoid saturation of the frequency division inductor. For example, materials such as high silicon steel, permalloy and ferrite have high magnetic permeability and saturation magnetic flux density and can withstand large operating currents.

Increase the cross-sectional area of the magnetic core: Increasing the cross-sectional area of the magnetic core can increase its ability to withstand current, thereby avoiding saturation of the frequency division inductor. At the same time, increasing the cross-sectional area of the magnetic core can also reduce the magnetic flux density in the magnetic core and reduce the loss of the magnetic core.

Increase the number of winding turns: Increasing the number of winding turns can increase the inductance and resistance of the frequency dividing inductor, thereby reducing the current and magnetic flux density and avoiding saturation of the frequency dividing inductor. At the same time, increasing the number of winding turns can also reduce the current and losses in the winding.

Reduce the operating frequency: Lowering the operating frequency of the frequency-dividing inductor can reduce its magnetic flux density and loss, thereby avoiding saturation of the frequency-dividing inductor. However, reducing the operating frequency may affect the performance of the entire circuit, requiring trade-offs and optimization.

Use auxiliary magnetic core: Using auxiliary magnetic core can increase the magnetic flux path of the frequency dividing inductor and reduce the magnetic flux density, thus avoiding the saturation of the frequency dividing inductor. At the same time, the use of auxiliary magnetic cores can also increase the mechanical strength and stability of the frequency division inductor.

Optimize circuit design: Optimizing circuit design can reduce the load on the frequency dividing inductor, thereby avoiding its saturation. For example, reducing the resistance and capacitance in a circuit can reduce the load on the crossover inductor, thereby reducing the likelihood of its saturation.

In short, avoiding the saturation of the frequency division inductor requires comprehensive consideration and optimization from aspects such as material selection, structural design, and circuit design. By selecting appropriate materials, increasing the cross-sectional area of the magnetic core and the number of winding turns, reducing the operating frequency, using auxiliary magnetic cores, and optimizing the circuit design, the saturation of the frequency division inductor can be effectively avoided and its performance and service life can be improved.