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This page introduces noise problems that often occur with brush motors for automobiles, its mechanism, and the solutions.
I have trouble suppressing common normal noise in a broad range from several hundred kHz to several hundred MHz, which is generated from brush motors for automobiles.
I do not have sufficient time to consider noise suppression due to the short design time. I want to clear the CISPR25 noise regulations.
It seems that the noise is generating in the motors for power windows, power slide doors, power seats, door locks, etc.
In order to meet the CISPR25 Class 4, use a PLT10H, X capacitor and Y capacitor in combination to solve the problems mentioned above!
Particularly, the combination shown in the following block diagram is the most effective for noise suppression.
Noise regulations CISPR25 Class 4 can be met by using a common mode choke coil with an X capacitor and Y capacitor in combination.
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