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Ultra‐high step‐up DC–DC converters: UHS, Re ‐UHS, and G‐UHS converters
Author(s) -
Liu Lingling,
Zhang Shaoru,
Luo Fanglin,
Qie Chenjie,
Jia Yikun
Publication year - 2019
Publication title -
ieej transactions on electrical and electronic engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.254
H-Index - 30
eISSN - 1931-4981
pISSN - 1931-4973
DOI - 10.1002/tee.22976
Subject(s) - inductor , converters , ripple , ćuk converter , boost converter , capacitor , voltage , inductance , electrical engineering , engineering , electronic engineering
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.