Analysis and Optimization of a Hybrid‐Clamped Three‐Level Series‐Resonant DAB Converter

ABSTRACT This paper proposes a hybrid‐clamped three‐level series‐resonant dual‐active‐bridge (HC3L‐SRDAB) converter with an asymmetric pulse‐width modulation (APWM) strategy to improve efficiency. The HC3L‐SRDAB topology reduces the voltage stress of switches –, while the APWM strategy involves only two control variables, ensuring simple implementation. Furthermore, the APWM strategy extends the zero‐voltage switching (ZVS) range, achieving full‐range ZVS at and and maintaining ZVS above 16.7% of the normalized power at . To reduce conduction losses, the root mean square (RMS) current is minimized by solving an optimization problem with the Lagrange multiplier method. Converter operation and steady‐state behavior are analyzed using the fundamental harmonic approximation (FHA). A 400‐W prototype validates the proposed approach, confirming wide‐range ZVS, reduced current stress, and higher efficiency compared with the conventional EPS strategy.