Design

Evaluation boards for current-compensated high-current chokes

17th April 2019
Alex Lynn

Proven test circuit boards are being offered by SCHURTER for the DKIH-1 and DKIH-3 high-current chokes. With these, an EMI filter circuit for one or three phase systems can be set up and tested easily and quickly in an iterative process without having to make any adjustments to the layout of your own PCB. 

Every developer of an electrical or electronic device is faced with the same problem: In the end, the device must comply with international EMC guidelines regarding emission and immission. Problems, often of an unpredictable nature, mostly arise in the power section.

Like most electronic assemblies, the power section is increasingly being mounted on printed circuit boards using discrete components. A compact filter directly on the printed circuit board with discrete components is therefore usually the best solution. And a current-compensated choke with capacitors is the most efficient measure for EMC suppression.

With the new SCHURTER DKIH-EVB (Evaluation Board) test circuit boards, a wide variety of filter configurations can be quickly calibrated with the DKIH series of current-compensated chokes without making any changes to an existing PCB layout.

With high L and C values, the majority of disturbances can be adequately attenuated. The art of filter design, however, lies in finding an effective and at the same time cost-optimised combination of components. Often, slightly smaller L and C values are sufficient if these are perfectly combined.

An EMC measurement of the finished system or device is indispensable for the declaration of conformity.

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