Work

EMI Reduction in Grid-Connected Converters Using the Nonlinear Behavior of Multi-Layer Ceramic Capacitors

Year: 2025

Type: article

Abstract: In soft switching power converters, placing a capacitor parallel to the switching semiconductor power devices is a means to reduce electromagnetic interference. This paper investigates the application of multi-layer ceramic capacitors, MLCCs, as parallel capacitors in grid-connected converters, focusing on the nonlinear behavior of these components. Unlike traditional capacitors, MLCCs, particularly Class II ceramics like X7R, exhibit voltage-dependent capacitance characteristics, which can introduce beneficial effects for EMI reduction. The study explores different types of MLCCs, comparing NP0/C0G and X7R, and highlights their respective behaviors in controlling voltage (dv/dt) and current (di/dt) transients. Through simulation and experimental validation, it is demonstrated that EMI mitigation using nonlinear MLCCs is more effective than using linear capacitor types as parallel capacitors. The findings of this research provide insight into the selection and application of parallel capacitors in grid-connected converters, with a focus on minimizing EMI.

Source: IEEE Open Journal of Power Electronics

DOI: 10.1109/ojpel.2025.3586881

Authors: Yusuf Kosesoy, Henk Huisman, Jan M. Schellekens

Institution: Eindhoven University of Technology

Language: English

Topic: Electromagnetic Compatibility and Noise Suppression

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,075

Funders: European Commission, Electronic Components and Systems for European Leadership