High Step-Up Converter Based on Coupling Inductor and Bootstrap Capacitors With Active Clamping

• Published in: IEEE transactions on power electronics Vol. 29; no. 6; pp. 2655 - 2660
• Main Authors: Hwu, K. I., Yau, Y. T.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01-06-2014; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Active clamping; Applied sciences; bootstrap capacitor; Bootstrap method; Capacitors; Circuit properties; Circuits; Clamps; Converters; Convertors; coupling inductor; Couplings; Direct power generation; Effectiveness studies; Electric currents; Electric, optical and optoelectronic circuits; Electrical engineering. Electrical power engineering; Electrical machines; Electronic circuits; Electronics; Energy efficiency; Exact sciences and technology; high step-up converter; Inductance; Inductors; IP networks; Joining; Magnetic devices; Pumps; Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices; Signal convertors; Sustainable development; Transformers and inductors; Windings; Performance evaluation; high step-up converter; coupling inductor; DC AC converter; Up converter; Direct current convertor; Bootstrap circuits; Topology; Experimental study; bootstrap capacitor; Inductor; Clamping; DC-AC power convertors; Inductance; Renewable energy; User interface; Frequency converter; Active clamping; Effectiveness factor; Active circuit; Capacitor
• ISSN: 0885-8993; 1941-0107
• DOI: 10.1109/TPEL.2013.2289387

As generally acknowledged, the high step-up dc-dc converter is widely used in the sustainable energy system as the front-end stage of the dc-ac converter. Therefore, a high step-up converter combining one coupling inductor and two bootstrap capacitors, together with the active voltage-clamping circuit which pumps portion of the leakage inductance energy to the output, is presented herein. By doing so, the efficiency at light load can be upgraded greatly, and hence tends to be flat between the minimum load and the rated load. In this letter, the basic operating principles of this converter are first illustrated in detail, and second some experimental results are provided to demonstrate the effectiveness of the proposed high step-up converter topology.