摘要
LLC resonant converters are commonly used as front-end converters in servers and electric vehicle chargers due to their soft-switching capabilities, including zero-voltage switching (ZVS) and zero-current switching (ZCS) [1]-[5]. Conventional synchronous rectifiers (SR) use power switches to increase efficiency by replacing diodes [6]-[8] to handle root-mean-square (RMS) currents up to 11 A. However, due to the high on-resistance (\mathrm{R}_{\text{on}}) of hig h -voltage Bipolar-CMOS-DMOS (BCD) power switches, the efficiency gain is only 1.8%. \text{In} contrast, a Gallium Nitride (GaN)-based SR can further reduce power loss to 2.0\% , but the lack of a body diode increases losses during dead time (Fig. 32.3.1 top left) [9], [10]. Additionally, GaN-based rectifiers are typically made larger to reduce \mathrm{R}_{\text{on}} and prevent current collapse. Therefore, a driver with strong driving capability, zero delay, and precise sensing for SR on/off timing is essential.