Ultra‐high step‐up DC–DC converters: UHS, Re‐UHS, and G‐UHS converters. Issue 10 (8th July 2019)

• Record Type: Journal Article
• Authors: Liu, Lingling; Zhang, Shaoru; Luo, Fanglin; Qie, Chenjie; Jia, Yikun
• Is Part Of: IEEJ transactions on electrical and electronic engineering. Volume 14:Issue 10(2019)
• Page Start: 1561
• Page End: 1569
• Publication Date: 2019-07-08
• Subjects: switching structure -- UHS -- zero‐voltage turn‐off -- voltage gain -- switching stress; Electrical engineering -- Periodicals; Electronics -- Periodicals; 621.3
• DOI: 10.1002/tee.22976
• Languages: English
• ISSNs: 1931-4973

Abstract

Abstract : A new type of switching structure was constructed based on two capacitors, an inductor, a diode, and a switch. The switching structure was added into a high step‐up (HS) converter, yielding an ultra‐high step‐up (UHS) direct current (DC)–DC converter. Two other converters, a repeated UHS converter and a generalized UHS converter, were derived from the basic UHS circuit. The converters depend mainly on charging and discharging of the inductors and capacitors to realize the step‐up function. One of the UHS converter switches realizes zero‐voltage turn‐off, which greatly decreases the switching stress. This article analyzes the UHS converter, and the operation of the UHS converter in the continuous‐conduction mode and discontinuous‐conduction mode. The boundary condition, external characteristics, voltage gain, voltage stress, and inductor current of the UHS converter were analyzed, emphasizing the advantages of the UHS converter; namely, high voltage gain, low switching stress, and low inductance ripple. Parameter design criteria for electrical components are listed. The theoretical analysis was verified by computer simulations and construction of a working device. © 2019 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.