Abstract:
The dual active bridge (DAB) converter is one of the
widely explored topologies in recent years due to its remarkable
features, such as inherent soft-switching characteristics, galvanic
isolation, and high power density. However, the conducted electromagnetic interference (EMI) analysis of the DAB converter is
seldom reported. In this paper, the common-mode (CM) and
the differential-mode (DM) equivalent circuits of the isolated
DAB converter are presented to understand the propagation
mechanisms of the conducted EMI noise in the converter. In
particular, the mixed-mode DM (MMDM) noise component of
the DM noise is quantified for the DAB converter. Further,
an experimental measurement method based on an external
impedance-matched circuit is proposed to quantify the DM
current due to the capacitive coupling between the primary and
secondary windings of the transformer. The quantified MMDM
noise and the DM noise through the transformer are estimated
using the proposed equivalent circuits in MATLAB-Simulink and
validated experimentally on a prototype DAB converter
