Influences of a capacitor layer in an integrated magnetic system

In DC/DC converter systems, power electronic circuits are reaching switching efficiencies close to hundred percent nowadays. Thus, most of the energy loss appears inside the passive magnetic circuit of the converter, which at the same time is the component that requires most space in the system. In order to battle this issue, research during the last century has been focused on planarization, hybridization and integration techniques with the goal to achieve higher efficiencies and decrease the profile and volume of the devices. As the integration of an inductor and transformer into one device is common, the integration of a capacitor layer directly into the magnetic circuit is very complex. This paper deals with the optimization of such an integrated capacitor layer inside an Integrated Magnetic System (IMS). Unless using silicon carbide transistors, the square form operation of an inverter is already causing EMC problems. The integrated resonant tank and particularly the capacitor layer should not allow or even cause the creation of additional ripples and overshoots.