A new‐high efficiency non‐isolated DC‐DC converter with combination of step‐up techniques

• Published in: International journal of circuit theory and applications 2024-12, Vol.52 (12), p.6275-6301
• Main Authors: Mizani, Amirreza, Gao, Hang, Amraei, Amin, Khaburi, Davood Arab
• Format: Article
• Language: English
• Subjects: Component reliability; Control methods; DC‐DC converter; Efficiency; Electric potential; Energy conversion efficiency; Fuel cells; high‐step‐up DC‐DC converter; Inductors; interleaved technique; non‐isolated converter; Photovoltaic cells; Semiconductor devices; switched capacitor technique; switched inductor technique; Topology; Voltage
• ISSN: 0098-9886; 1097-007X
• DOI: 10.1002/cta.4074

Summary In this paper, a new high‐step‐up DC‐DC converter without any coupled inductors or transformers is introduced. The structure of the introduced converter consists of two boost techniques, namely, switched inductor and switched capacitor, used simultaneously. The drawbacks of each technique are mitigated according to the proposed structure and the introduced control method. Therefore, the main contribution of the introduced converter is its ability to use boost techniques while avoiding high input current ripples and inrush currents in the path of semiconductor devices. Thus, there is no need for an auxiliary inductor. Additionally, the number of required components is low, and it benefits from a common ground, which are advantages of this converter in terms of economy and reliability. Another advantage is the high efficiency of the proposed converter in comparison with recent topologies, making it suitable for renewable energy applications such as photovoltaic (PV) systems and fuel cell applications. The proposed converter has been implemented in a laboratory to verify its performance. It operates at 94.51% efficiency with a 200 W output power, a 40 kHz switching frequency, a 40 V input voltage, and a 240 V output voltage. This paper introduces a novel high step‐up DC‐DC converter that utilizes switched inductor and switched capacitor techniques without the need for coupled inductors or transformers. The converter's design minimizes input current ripples and inrush currents, eliminating the need for auxiliary inductors and reducing component count, which enhances both economic and reliability aspects. The converter, tested in a laboratory setting, achieves a 94.51% efficiency, making it highly suitable for renewable energy applications such as photovoltaic systems and fuel cells.