A 2-MHz 60-W Zero-Voltage-Switching Synchronous Noninverting Buck-Boost Converter With Reduced Component Values

This brief presents a high-frequency high-efficiency zero-voltage-switching (ZVS) synchronous noninverting buck-boost converter for tens-of-Watt applications. By using two pairs of small auxiliary inductors and capacitors, the proposed converter can achieve ZVS under different load currents without increasing voltage stress across power field-effect transistors. The switching power loss is thus minimized to enable high-frequency operation of the converter. The proposed converter can be also configured into the boost mode or the buck mode with ZVS operation when the input voltage changes in order to maintain high power efficiency under different input voltages. The proposed noninverting buck-boost converter has been implemented to operate at 2 MHz and deliver 60-W output. The measured peak power efficiency achieves 94.3%, and the output capacitance and its volume can be reduced by at least 14 times and 4.8 times compared with other state-of-the-art counterparts.