ABSTRACT
The planar transformer, or inductor, is a low profile device that covers a large area, whereas, the conventional transformer would be more cubical in volume. Planar Magnetics is the new “buzz” word in the field of power magnetics. The assembled planar transformers have very unique characteristics in their finished construction. In the assembled planar transformer, every primary turn is at a precise location, governed by the PC board. Planar transformers and inductors are being integrated right on the main PC board. Design engineers are pushing the operating frequency higher and higher to where it is commonplace to operate at frequency range between 250-500kHz. The window utilization factor in the conventional transformer is about 0.40. Designing a planar transformer and using the PC winding technique, reduces the window utilization factor even further. Core assembly and mounting should be strong and stable with temperature. One of the most viable methods for securing core halves together is epoxy adhesive.
