Analysis and implementation of high-gain non-isolated DC–DC boost converter

• Published in: IET power electronics Vol. 10; no. 11; pp. 1241 - 1249
• Main Authors: Muhammad, Musbahu, Armstrong, Matthew, Elgendy, Mohammed A
• Format: Journal Article
• Language: English
• Published: The Institution of Engineering and Technology 09.09.2017
• Subjects: conduction loss; coupled inductor; DC‐DC power convertors; diode reverse recovery problems; diode voltage stress; extreme duty cycle; high step‐up DC‐DC converters; high‐gain nonisolated DC‐DC boost converter; high‐semiconductor voltage stress; industrial applications; leakage energy recycle; on‐resistance switch; passive clamp circuit; passive networks; power 250 W; power electronic applications; power inductors; semiconductor diodes; Special Section: Selected papers from the 8th International Conference on Power Electronics, Machines and Drives (PEMD 2016); switched capacitor networks; switched capacitor technique; switching loss; voltage 190 V; voltage 20 V; ZCS; zero current switching; conduction loss; diode reverse recovery problems; passive clamp circuit; voltage 20 V; ZCS; power electronic applications; voltage 190 V; passive networks; zero current switching; switched capacitor technique; switched capacitor networks; high step-up DC-DC converters; extreme duty cycle; switching loss; leakage energy recycle; DC-DC power convertors; power 250 W; on-resistance switch; power inductors; semiconductor diodes; coupled inductor; high-semiconductor voltage stress; diode voltage stress; high-gain nonisolated DC-DC boost converter; industrial applications
• ISSN: 1755-4535; 1755-4543; 1755-4543
• DOI: 10.1049/iet-pel.2016.0810

High step-up DC–DC converters are increasingly required in many industrial applications. Conventional topologies operate at extreme duty cycle, high-semiconductor voltage stress, switching loss, and diode reverse recovery problems. This study presents a new non-isolated high gain, boost converter operating with a modest duty cycle by integrating a coupled inductor and switched capacitor technique. Importantly, the structure of the high-voltage side, together with the switched capacitor, reduces the voltage stress of the power switch to less than one third of the output voltage, which in turn helps to reduce the conduction loss by using a low on-resistance (Rds-on) switch. The diode voltage stress is less than the output voltage which facilitates faster recovery. Furthermore, the converter employs a passive clamp circuit to recycle the leakage energy. The main switch achieves zero current switching (ZCS) turn-on performance and all diodes achieve (ZCS) turn off reducing reverse recovery related losses. As a result, the circuit exhibits high efficiency performance; which is essential for most modern power electronic applications. In this study, the operational principle and performance characteristics of the proposed converter is presented and validated experimentally with a 250 W, 20 V input voltage/190 V output voltage prototype circuit.