The industry is clinging to a persistent myth that higher switching frequencies is leading to difficult (if at all solvable) EMI challenges. This view has only merit if small, incremental frequency increases are considered. A small step from 130Khz to e.g., 260Khz only makes EMI implementation more costly because now the switching frequencies fundamental has to be filtered w/o a sufficient frequency increase to make EMI filter components smaller. But if one considers a switching frequency increase to e.g., >1MHz then the EMI filter components are becoming sufficiently small to enable a cost reduction, even when a fundamental has to be filtered.
There are two types of EMI – Conducted EMI and Radiated EMI.
In Conducted EMI, the operation range causes the input filters to become much smaller (100kHz must be filtered) and therefore NexGen’s power systems have a clear advantage on conducted testing. In Radiated EMI, we use a faraday cage that doubles as our heat dissipater as well, this dual-purpose implementation allows a compact design with robust conducted EMI performance
NexGen’s power systems show that it is possible to build >1MHz frequency designs, still meeting EMI requirements at reduced EMI cost.