Reducing Inductor Size in High Frequency Grid Feeding Inverters

Increasing switching frequency of power electronic devices is the most efficient way to reduce their volume. Especially for grid feeding inverters, the size of the inductors can be reduced remarkably, if the right strategy is applied. This paper shows a possible solution using SiC-MOSFETs, applying Triangular Current Mode (TCM) and Zero Voltage Switching (ZVS). This leads to a tremendous reduction in the inductor nominal value, but results in 100% ripple requirement for this component. Design options for these inductors are discussed and practically qualified.