ABSTRACT This paper investigates the impact of the quasi‐square wave zero voltage switching (QSW‐ZVS) technique on the design of passive electromagnetic interference (EMI) filters for DC‐DC buck converters. A standard design‐oriented analysis is conducted, focusing on a single‐stage LC EMI filter with a single‐resistor shunt damping network ‐, aiming to minimize the impact of the filter on the small‐signal dynamic of the converter. We demonstrate that QSW‐ZVS enables a reduction in the size of the damping network of the EMI filter when compared with conventional hard‐switching designs. Furthermore, we generalize the proposed analysis to different EMI filter cutoff frequencies, evaluating how the value of the shunt damping capacitance varies when QSW‐ZVS is enabled. Both the proposed small‐signal model and the design methodology are validated with SIMPLIS simulations under various operating conditions of a DC‐DC buck converter.
Simone et al. (2026) studied this question.