A High Step-Down Buck-Boost Converter Based on Coupled Inductor With Wide Input Range

In data center application, the bus converter not only needs to achieve high step-down gain but also keep a high efficiency when the bus voltage changes in a wide range. A high step-down buck-boost converter based on tapped inductor in this paper is presented. Due to the tapped inductor, the proposed possesses high step-down conversion capability. Moreover, when input voltage changes greatly, the duty cycle of the converter can be controlled to a suitable range and hence maintain a high efficiency. The theoretical analysis is verified by prototype with a wide input voltage (36-60V), 3. 3V output voltage, and rated output current 10A.