NDLI: Family of half-bridge LLC resonant converters with auxiliary switches for hold-up operation

Content Provider	IET Digital Library
Author	Tang, Xinxi Wu, Hongfei Zhao, Jian Xing, Yan
Abstract	For applications with hold-up time requirement, the magnetising inductance of the conventional LLC converter must be designed small enough to provide required peak voltage gain. However, the efficiency in normal operation will be decreased when considering the gain requirement. Here, a family of half-bridge (HB) LLC resonant converters is proposed for low-voltage and high-current applications. In order to provide the required voltage gain, auxiliary switches are introduced into parts of the secondary-side rectifiers. In the normal state, the auxiliary switches keep off and high efficiency can be achieved since the proposed converter always operates around the resonant frequency. Without considering the voltage gain requirement, soft-switching is the only consideration for the design of the magnetising inductance. Therefore, circulating current and conduction losses induced by the magnetising inductance can be reduced significantly. During the hold-up time, the auxiliary switches operate with pulse-width modulation (PWM) control to provide sufficient voltage gain. Furthermore, matrix transformers are engaged to simplify the winding structure and increase the output current capability. Operation principles, characteristics, and design considerations of the proposed LLC resonant converter are analysed in detail. Experimental results are given to verify the effectiveness and the advantages of the proposed converter.
Starting Page	1376
Ending Page	1384
Page Count	9
ISSN	17554535
Volume Number	12
e-ISSN	17554543
Issue Number	Issue 6, May (2019)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-pel/12/6
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-pel.2018.5654
Journal	IET Power Electronics
Publisher Date	2019-02-01
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Auxiliary Switches Circulating Current Conduction Loss Control of Electric Power System Electrical/electronic Equipment Energy Utilisation Half-bridge LLC Resonant Converter High-current Application Hold-up Operation Hold-up Time Requirement Low Power Electronics Low-voltage Application Magnetising Inductance Matrix Transformer Peak Voltage Gain Power Electronics Power Supply Pulse-width Modulation Control PWM Control PWM Rectifier Resonant Frequency Resonant Power Converter Secondary-side Rectifier Soft-switching Supervisory Circuit Switching Converter Time Requirement Transformer And Reactors Transformer Windings Voltage Gain Requirement Winding Structure Zero Current Switching Zero Voltage Switching
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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