New Industry Products

Evaluation Boards for Current-Compensated High-Current Chokes

April 13, 2019 by Scott McMahan

Schurter reported that it now offers test circuit boards for the DKIH-1 and DKIH-3 high-current chokes. (See DKIH-3 high-current choke above). With these evaluation boards, an EMI filter circuit for 1- or 3-phase systems can be set up and tested quickly and easily in an iterative process without having to adjust the layout of your own PCB.

All Devices Must Meet EMC Guidelines

In the end, every device must comply with international EMC guidelines regarding emission and immission. Issues, often of an unpredictable nature, usually occur 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 mounted directly on the printed circuit board with discrete components is therefore usually the best solution, according to Schurter

And a current-compensated choke with capacitors is the most efficient means of measuring EMC suppression, Schurter says.


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


The boards offer space for various X- and Y-capacitors and resistors, and they are prepared for quick connect, screw, or solder terminals

With high L and C values, the vast majority of disturbances can be sufficiently attenuated. The art of filter design, however, is in finding the ideal balance between cost and performance for the components. Often, slightly smaller L and C values are adequate if they are perfectly combined.

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

DKIH-1 has a 250Vac/425Vac and a rated current of 10A to 50A. DKIH-3 comes in two variants. Both DKIH-3 variants have a 600V rated voltage. One has variant features a rated current of 10A to 16A, and the other version has a rated current of 20A to 32A.