Power Quality, UPS, Filters
Technical Dialogue Session
Utility Interface II
EMI filter, Single stage, Near field effect, Server power supply
In this paper, a 1 kW GaN-based server power supply with single stage EMI filter is demonstrated. Balance and shielding technique are implemented to significantly reduce CM noise. To reduce filter mutual parasitic, the near field effect is firstly studied based on two methods: finite element analysis (FEA) simulation and near field experimental measurement. Flux distribution around the DM inductor at different frequency is clearly plotted, and a better layout of inductor and capacitor with reduced mutual coupling is conducted. Furthermore, to reduce filter self-parasitic, ESL cancellation is implemented with the X-cap structure in DM capacitors.