A high step-up multi-device boost converter using l-impedance network at lower range of duty cycle with reduced switch voltage stress

This article presents a novel DC-DC boost converter designed to achieve ultra-high voltage gain while minimizing switch voltage stress. Additionally, the converter provides enhanced control over the output voltage compared to other high-gain boost converters. The salient feature of the proposed converter is its ability to adjust the output voltage by varying the number of inductors in the L-impedance network (k), the number of switches in the multi-device unit (m), and the duty ratio (D). The article provides a detailed overview of the proposed converter's structure, focusing on k = m = 2. Moreover the proposed converter is integrated with multiple switches which contribute to reducing the size of passive components. The article provides an in-depth discussion of the theoretical framework, including the operating principles, steady-state behavior, and efficiency performance of the converter. It also evaluates various power losses inherent in the design. To evaluate the dynamic response of the converter under closed-loop conditions, the design of the controller is outlined, and a small-signal model is developed. To highlight the strengths of the proposed converter, a comparative study is conducted with similar high-gain boost converters. Finally, the design is validated through experimental studies using a 100-W prototype, achieving a voltage conversion from 25 to 112.5 V.