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By passing conducting wires through the hole of the ring, the conducting wires and the ferrite core form a coil (inductor).

įerrite cores come in various shapes, but most are ring-shaped. For these and other reasons, Ni-Zn ferrite is often used for noise countermeasures. Mn-Zn ferrite is conductive, so it requires insulation work, and Ni-Zn ferrite has better high-frequency characteristics. Formerly, coils were often made by winding conducting wires around a ring-shaped ferrite core, so ferrite used for noise countermeasures is likewise called a ferrite core.įerrites include Mn-Zn ferrite and Ni-Zn ferrite according to the composition. įerrite cores are ceramic magnetic bodies consisting of ferrites (soft ferrites) processed into various shapes. When the delivery date is near, there is no time to change the board, so parts such as ferrite cores that enable countermeasures without changing the board come in handy. There is no problem as long as the noise level is within the regulation value as expected at this point, but the test results sometimes exceed the regulation value. Recently, experience concerning designs that do not emit noise is increasing, and various measures are being implemented beforehand to prevent the generation of noise, but of course the effects cannot be known until the final test.

However, the final check cannot be performed until the device design is complete. (Although they are sometimes fixed to the board.)Īs previously introduced, when commercializing an electronic device, it is necessary to check that the noise emitted from the device satisfies the EMI regulations.

This time we introduce noise countermeasure parts that do not require mounting on a board. Previously, we introduced noise countermeasure parts mounted on a board as part of the electronic circuit. Noise Suppression Filter Guide Basics of noise countermeasures Ferrite Cores