12-layer PCBs - Planar transformers



We are one of the few manufacturers in Europe that produce this type of device on a large scale. Simply put, a planar transformer is a coil that is fabricated using a multi-layer circuit board. On the whole, we mainly produce 6 to 12 layer planar transformers. We are able to directly incorporate a planar transformer into a PCB.

The most complex planar transformer we mass produce is an eight layer board, whereby each core has a 210 micron Cu layer on both sides of the board. The resulting gap of 420 microns must subsequently be filled in such a way as to avoid the formation of air bubbles, which could lead to a short circuit between the coils. The cores are then compressed together and the vias copper plated.



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