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This study presents a high boost DC–DC converter, integrates voltage multiplier cell, voltage lift capacitor, and coupled-inductor techniques to achieve a high-voltage gain. The proposed topology has the capability of extension without utilising any additional winding for a very large voltage conversion ratio. With utilising a passive clamp circuit and without requiring higher duty cycle values, the suggested converter obtains a large conversion ratio, low conduction losses, and reduced voltage stress of semiconductors with a steady value for the whole range of duty cycle. The converter operation principle is discussed and its steady-state operation is analysed in detail. Also, theoretic efficiency calculation and design guidelines of the topology are explained. Then, the proposed DC–DC converter is compared with similar configurations to indicate its advantages. Eventually, the validity of theoretic analysis is verified using experimental measurement results of the implemented prototype with a power rating of 226 W.

A single-switch high boost DC–DC converter is introduced in this work. In the suggested topology, a voltage multiplier cell and three-winding coupled inductor (CL) are integrated to obtain an ultra-large conversion ratio. Using a passive clamp circuit and also, no requirement of larger duty cycle values enable the converter to have a very high voltage gain, low conduction loss, and reduced voltage stress of semiconductors. Moreover, the leakage inductance of the CL alleviated diodes reverse recovery problem. Some important merits include ultra-high voltage gain, operating in low duty cycles, reduced voltage stress of semiconductors, continuous input current, high efficiency, and low turn ratio of the CL makes the introduced converter very suitable for renewable energy applications. Steady-state analysis and operation principles of the presented topology are expressed completely in the study. Moreover, the theoretical efficiency analysis and design guidelines of the suggested configuration are presented. Also, the superiority of the presented topology over the state-of-the-art similar DC–DC converters is demonstrated in the comparison study. Eventually, the validity of theoretical analysis is verified using experimental measurement results of the implemented prototype with a power rating of 240 W and an output voltage of 440 V.

This study proposes two configurations for a non-isolated, high step-up, single-switch, coupled-inductor-based DC–DC converter. A coupled inductor and voltage multiplier cells are used in the presented topologies to obtain a high voltage gain. Also, a passive clamp circuit is applied in the topologies to reduce voltage stress of the main power switch. This leads to utilising a power switch with lower on-state resistance, which decreases the conduction loss. Several advantages such as low operating duty cycle, high voltage conversion ratio, reduced voltage stress of semiconductors, low turn ratio of the coupled inductor, leakage inductance energy recovery and high efficiency operation make the presented structures appropriate for sustainable energy applications. The operational principle and steady-state analysis of the suggested topologies in continuous conduction mode are expressed in detail. Also, design procedure and theoretical efficiency of the topologies are presented. Then, the suggested topologies are compared with several similar high step-up topologies to prove their advantages. Finally, the performance and feasibility of the proposed DC–DC converter configurations are confirmed through experimental measurement results of 29 V input and 435 V/213 W and 480 V/238 W output laboratory prototypes at 50 kHz switching frequency.