Abstract
In this research, from the viewpoint of EMC (EMI and immunity), we evaluate the load-side immunity of switching power supply in resistive load and examine the countermeasures. In the previous report, EMI countermeasures revealed that the frequency spreading factor (Δf / RBW, Δf: spread width) affects the reduction effect. Since noise is bidirectional (EMI and immunity are in opposite directions), we considered that EMI countermeasures could be effective as a means of immunity countermeasures, and focused on the possibility of immunity countermeasures using frequency spreading.
