A Single-Switch Ultra-High Step-Up DC-DC Converter With Low Voltage Stress Based on Quadratic Y-Sources Topology

In this paper, a single-switch ultra-high step-up DCDC converter with low voltage stress based on quadratic Y-sources topology is presented. The converter continuous input current makes it suitable for photovoltaic applications. Moreover, unlike many converters based on impedance source networks which suffer from the duty cycle limitations, the duty cycle of the proposed converter is wide. An ultra-high voltage gain with only one switch is achieved in the proposed converter by combining the quadratic boost and the Y-source structures. The usual high switch voltage stress drawback suffered by these structures is significantly reduced by shifting the switch to the low voltage side. A theoretical analysis of the converter is provided and a simulation circuit at input voltage 40V, output voltage 480V and rated power 200W is performed to support the theoretical results. Furthermore, a comparison section explains the advantages and disadvantages among the proposed converter and the counterpart converters.