A half-bridge resonant DC/DC converter with satisfactory soft-switching characteristics

In this paper, a half-bridge resonant DC/DC converter with constant output voltage is proposed, which possesses good soft-switching characteristics. At rated operating point, the switches can operate almost without switching-on and off losses. Further, at whole working range, both zero-voltage-switching mode of switches and zero-current-switching mode of diodes are maintained. Thus, the converter can achieve a high efficiency. Experimental results verify the low switching losses and high efficiency characteristics based on a 200 W prototype. System efficiency is as high as 96% and always above 90% when output power changes from 100% to 20%.