Open AccessWide ZVS operation of a semi‐dual‐bridge resonant converter under variable‐frequency phase‐shift control
Author(s) -
Zhou Shengzhi,
Li Xiaodong,
Zhong Zeran,
Zhang Xinan
Publication year - 2020
Publication title -
iet power electronics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.637
H-Index - 77
eISSN - 1755-4543
pISSN - 1755-4535
DOI - 10.1049/iet-pel.2019.1161
Subject(s) - control theory (sociology) , rectifier (neural networks) , three phase , dual (grammatical number) , harmonic , topology (electrical circuits) , power (physics) , voltage , range (aeronautics) , computer science , materials science , control (management) , engineering , physics , electrical engineering , art , stochastic neural network , literature , quantum mechanics , artificial intelligence , machine learning , recurrent neural network , artificial neural network , composite material
A secondary phase‐shifted dual‐bridge converter with semi‐active rectifier is able to perform buck–boost dc–dc conversion with soft‐switching. However, it can not maintain zero‐voltage switching (ZVS) operation for all switches in a wide load range. Besides, the root mean square/peak tank current increases inversely with the decreasing of load in the light load region. To alleviate these problems and extend its load range, a hybrid varying‐frequency phase‐shift (VFPS) control is proposed to manipulate the power for a semi‐dual‐bridge converter with the primary half‐bridge and secondary semi‐active rectifier topology. Steady‐state analysis of the converter under VFPS control is performed using the fundamental harmonic approximation approach. A detailed design procedure is given then to find a full ZVS trajectory with a fixed ZVS margin at light load. Experimental results proved that the VFPS control can effectively extend the operation range with full ZVS and maintain high efficiency at light load for the semi‐dual‐bridge resonant converter.