Widespread method conducted emissions tend to be caused by parasitic capacitances like All those on the heatsink and transformer alongside with the board structure, and switching voltage waveform over the switch. Inductive coupling takes place when You can find an electrical (because of a capacitively coupled) or magnetic (as a https://franciscoiasjz.losblogos.com/30597305/emc-emi-filter-for-pv-inverters-an-overview