Modular non-isolated multi-input high step-up dc–dc converter with reduced normalised voltage stress and component count

• Published in: IET power electronics Vol. 11; no. 6; pp. 1092 - 1100
• Main Authors: Varesi, Kazem, Hosseini, Seyed Hossein, Sabahi, Mehran, Babaei, Ebrahim
• Format: Journal Article
• Language: English
• Published: The Institution of Engineering and Technology 29.05.2018
• Subjects: 2‐input version; component count; continuous input current; DC‐DC power convertors; low‐normalised voltage stress; low‐power application; medium‐power application; modular high voltage gain structure; modular nonisolated multiinput high step‐up DC‐DC converter; multiinput high step‐up structures; NINCIBMI topologies; nonisolated noncoupled inductor‐based multiinput DC‐DC converters; operational modes; reduced normalised voltage stress; Research Article; steady‐state analysis; medium-power application; low-normalised voltage stress; operational modes; 2-input version; multiinput high step-up structures; nonisolated noncoupled inductor-based multiinput DC-DC converters; DC-DC power convertors; low-power application; NINCIBMI topologies; steady-state analysis; continuous input current; component count; modular high voltage gain structure; modular nonisolated multiinput high step-up DC-DC converter; reduced normalised voltage stress
• ISSN: 1755-4535; 1755-4543; 1755-4543
• DOI: 10.1049/iet-pel.2017.0483

This study proposes a modular high voltage gain structure for non-isolated non-coupled inductor based multi-input (NINCIBMI) dc–dc converters. Proposed topology can produce higher voltage gains per number of components (switch, diode, capacitor and inductor) than other NINCIBMI topologies. In other words, the proposed topology uses less number of components for achieving the same voltage gain. This property can lead to reduced cost, size, weight and complexity of topology. Also, proposed topology benefits from continuous input current. Despite the high voltage gain of proposed topology, it has considerably low normalised voltage stress (NVS) on its switches/diodes. Another important advantage of proposed topology is that, as the number of input units increase, the voltage gain increases too, but the NVS on switches/diodes decreases. The proposed topology is suggested for low and medium power applications. The 2-input version of proposed topology has been studied in detail and different operational modes and steady-state analyses have been presented. For a better evaluation, proposed topology has been compared with recently presented novel multi-input high step-up structures. The 2-input version has also been experimentally implemented. Obtained results confirm appropriate performance of proposed topology.