In the last decades electronics is getting into everyone's life. A great impact in this sense is due to the huge increase in the consumer electronics devices market: among the research fields about this topic, an important one is dedicated to the design of more compact, reliable and powerful energy suppliers. The main goals are: to increase the delivered power, guarantee internal galvanic isolation and maximise the power density. For over a century galvanic isolation was obtained with inductive coupling. This physical phenomenon exploits magnetic field as an interaction media between two or more copper coils, that become inevitably lossy and bulky as soon as the system power increases.