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Technical Dialogue

Quality and System Reliability Including EMI/EMC

D11.9 - Near-Field Coupling Mitigation of the Noise from High Voltage DC-Link Decoupling Capacitors in Voltage Source Converters

Thursday, March 20, 2025
11:30 AM – 1:30 PM ET
Location: Level One, Hall A3
The increasing adoption of wide-bandgap (WBG) devices in power converters allows for higher switching frequencies, reducing thermal stress and enabling smaller filtering and cooling components. This paper investigates the impact of DC-link decoupling capacitors (DCAPs) on near-field (NF) coupling, an area previously overlooked in studies focused on electromagnetic interference (EMI) noise and voltage stress. This work analyzes four DCAP configurations within a 150 kW, 800V power stage, and PCB-based power stage using experiment and finite element analysis (FEA) tools to assess the effects on NF radiation across various frequency ranges. The study provides design guidelines for optimizing DCAP placement to minimize NF radiation while maintaining effective EMI suppression. This research aims to bridge the gap between DCAP application for EMI differential mode (DM) noise control and NF coupling management in highly integrated power converter designs.