A loosely winding transformer with series resonant converter

This paper focus on analysis, design and measurement results of the loosely winding contactless transformer using resonant converter. Next, the experimental set up is built to transfer power of 300W over the different gap variation (1mm-10mm) using series resonant converter. Compare to the traditional closely coupled transformer, the contactless transformer with separated primary and secondary winding is used. A loosely contactless transformer with a large air gap has small magnetizing inductance and large leakage inductance comparing with a closely conventional transformer.