Affiliation of Author(s):自动化学院
Journal:IET Power Electron.
Abstract:A novel isolated buck–boost (IBB) converter with a dual-transformer (DT) and an active-controlled three-level rectifier (AC-TLR) is proposed in this study. A new family of IBB converters is derived with different implementations of the AC-TLR. The two transformers in the converter supply power to the output alternatively through the phase-shift control of the active switch in the AC-TLR. A voltage-doubler configuration is built and three voltage levels are generated with the DT and AC-TLR structure. Therefore, the diodes and switches in the rectifier sustain only half of the high-output voltage and turns ratios of the transformers are reduced. In addition, the zero-voltage-switching operation of all the active switches on both the primary and secondary sides is achieved and the reverse-recovery problem of all the diodes is alleviated in the wide operation range. Furthermore, the output voltage of the converter is regulated in a wide range due to the buck and boost voltage conversion characteristics of the converter. The operational principles, modulation and characteristics of the converter are presented. Finally, a 400 V input and 350–750 V output prototype is built and tested to verify the effectiveness of the proposed converters. © The Institution of Engineering and Technology 2018.
ISSN No.:1755-4535
Translation or Not:no
Date of Publication:2019-02-20
Co-author:Sun, Kai,Liu, Tingting,xy
Correspondence Author:Fred Wu
Date of Publication:2019-02-20