This paper presents a novel one-step dead time optimization method utilizing real-time detection of gate-source voltage (VGS) signals. Unlike conventional adaptive methods that rely on additional high-voltage (HV) components or propagation- delayed feedback, this approach exploits the crosstalk ripples on the synchronous switch to detect the switching states of the complementary switch. The proposed closed-loop system deter- mines the near-optimal dead time within a single switching cycle, eliminating the need for iterative convergence while significantly reducing sensing complexity. The method is experimentally vali- dated on a 48 V-to-12 V synchronous buck converter operating at 100 kHz using SiC MOSFETs. Experimental results demonstrate an efficiency improvement of up to 3.9% across a wide load current range, compared to a fixed 500 ns dead time setting.
