Nonisolated High Step-Up Impedance Source DC–DC Converter With ZVS Operation, Low Switches Voltage Stress, and Diodes Losses

In this article, a high voltage gain quasi-Z-source converter with reduced voltage stress and low diode loss is proposed. The innovative integration of voltage enhancement methods with the basic structure provides high conversion ratio with reduced imposed voltage on the switches. The input side diode loss in the basic quasi-Z-source converter along with hard switching operation and substantial switch voltage stress lead to low efficiency. Due to the modifications made in the proposed structure, the diode losses are eliminated, the switches voltage stress is remarkably reduced, and zero voltage switching conditions are provided for all switches which remove the capacitive turn-on loss. Additionally, the presented converter benefits from continuous input current with low ripple and common ground between the input and output. The mentioned advantages and features make the proposed converter stand out among existing quasi-Z-source topologies. The converter is fully analyzed, a laboratory prototype is implemented, and the results are compared with other counterparts to confirm the achieved features.