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Posted On Tuesday 7th March 2017 11:55 AM

The magical effect of the soft magnetic material is not to be said, it can rely on the smallest external magnetic force to achieve maximum magnetic field strength. In some cases is essential to a necessary material. In the differential mode interference, soft magnetic material is such an important material. This paper will introduce the working principle of filter inductor and its requirement for soft magnetic material in differential mode interference.

Differential mode noise and differential mode choke coil works

Digital circuit, switching power supply, power electronic switch generated by the square wave harmonics and spike interference and motor load on the power network interference, usually belong to differential mode noise interference, differential mode interference suppression method is usually used differential mode filter inductor and differential mode A low-pass filter consisting of a capacitor. Differential mode filter inductor works: When the filter inductor coil flow through the power line low-frequency peak current or DC current core is not saturated, while maintaining sufficient incremental permeability and inductance to ensure that there is a high-frequency interference The sense of noise and the blocking effect.

The Requirement of Soft magnetic cores Materials for Differential - mode Inductors

The basic requirement for the differential mode inductor core is to have the highest possible inductance in the required interference band, subject to the rated current is not saturated, so the core material should have the following characteristics:

Constant magnetic properties: Under the conditions of rated low frequency pe

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