Column: EMC
Magnetic cores Magnetic cores are seen in many applications, such as the DC-DC converter in Tesla electric vehicles. Te output current for this type of
application oſten exceeds hundreds of amperes, and any inductor on the output will be bulky, heavy and costly. So instead of placing inductors, the positive and negative rails were put on adjacent layers
of the board. Depending on the current rating, wide tracks or planes are oſten used. As with a bifilar winding, all the magnetic field then flows in the small gap between the two planes, and the only remaining flux is the high-frequency common-mode noise. All that’s needed then is to put a core (or multiple cores) through or around the board, which is mechanically easy.
Figure 3: This layout means strong coupling between the two traces (before and after the filter)
Figure 4: Low-cost filter implementation using ferrite cores and Y-capacitors
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