A modified configuration of high step-up non-isolated DC-DC converter with low voltage stress: Analysis, design, and implementation

Reza Mohajery1 | Hossein Shayeghi 1 | Farzad Sedaghati 1 | Asghar Bahador 1 | Nicu Bizon2

1 Energy Management Research Center, University of Mohaghegh Ardabili, Ardabil, Iran
2 Faculty of Electronics, Communications and Computers, University of Pitesti, Pitesti, Romania


 

This study develops a novel DC-DC converter with an extremely high voltage conversion ratio that utilizes just one switch, a voltage multiplier circuit (VMC), and a coupled-inductor. Two diodes and two capacitors comprise the VMC, employed to reach high voltage gain. Consequently, the conduction loss is minimized by using a low voltage rated switch with lower RDS(on). Due to the coupled inductor's leakage inductance, the output diodes' reverse recovery trouble is solved. Moreover, the passive clamp technique stores and recycles leakage energy at the output. The proposed DC-DC converter features are high conversion ratio, low maximum voltage on semiconductors, remarkable efficiency, the existence of only one active low voltage switch, and simple circuit topology with common ground between the input and the output. This paper outlines CCM, BCM, and DCM's operating concept and steady-state analysis in great detail. Furthermore, the suggested structure's capability is indicated by mathematical analysis and comparative findings with other earlier structures. Eventually, experimental finding with 210 W output power and 25 kHz switching frequency demonstrates that the proposed converter can be used successfully.

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