Two-boosting-staged single-switched ultrahigh step-up topology with continuous input current and reduced voltage stress

This article presents a modified non-isolated ultrahigh step-up DC-DC converter comprising two boosting stages: a voltage multiplier cell and a two-winding coupled inductor (TWCI). A further increasing in the converter’s voltage gain is possible without the need for an excessive duty cycle or a high turn ratio of TWCI. As a result, stress on the power switch from voltage is low. Along with a common ground within the source and the load, a simple design, decreased voltage stress on the semiconductors, and continuity of input current are merits of the suggested converter. Total efficiency has been increased by the soft-switching capabilities of three diodes and the existence of one switch in the proposed converter with low ON-state resistance. To assess the improved performance of this topology, all operating modes, steady-state investigation, and a comparison of the suggested converter with other relevant ones are described in detail. Additionally, to accurately determine the real voltage gain and efficiency, the circuit takes the parasitic elements into account. A laboratory prototype is assembled so that its effectiveness under various conditions can be evaluated. Then, the outcomes for input voltage of 15V, output voltage of 139V, and output power of 210W are measured in the experiments.