This seminar is intended as a comprehensive introduction for engineers wanting a fundamental understanding of electromagnetic compatibility (EMC) issues associated with switch-mode power converters, and experienced engineers desiring a detailed understanding of electromagnetic interference (EMI) causes and fixes for power converters.
The seminar begins with an introduction to noise coupling mechanisms and their properties. The concept of impedance mismatch is presented as a basis for understanding filtering concepts. Differential-mode (DM) and common-mode (CM) separation and filtering approaches are derived, and measurement and separation techniques presented. DM & CM measurement and EMI reduction techniques are presented for an experimental flyback converter. Converter layout techniques and principles are derived, and experimentally verified. The seminar provides an emphasis on how DM and CM currents are created in power converters, and layout and construction techniques to minimize the need for costly filtering. Several practical EMI reduction techniques and construction methods are provided throughout the presentation. Frequency-domain and time-domain comparisons are presented for silicon carbide (SiC) and silicon (Si) power semiconductors.
