Transactions of China Electrotechnical Society  2020, Vol. 35 Issue (4): 775-785    DOI: 10.19595/j.cnki.1000-6753.tces.190064
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An Improved LLC Resonant Converter with Auxiliary Bi-Directional Switch for Wide-Input-Voltage Range Applications
Yang Dongjiang, Duan Bin, Ding Wenlong, Song Jinqiu, Zhang Chenghui
School of Control Science and Engineering Shandong University Jinan 250061 China

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Abstract  Wide input voltage range is a critical feature for LLC converter to guarantee enough hold-up time. A small magnetizing inductor can bring wide input voltage range for conventional LLC converter for hold-up operation. However, this inevitably increases reactive power and reduces efficiency for normal operation. In this paper, an improved LLC converter with auxiliary bidirectional switch is proposed to obtain enough voltage gain in hold-up mode with larger magnetizing inductor to reduce normal losses. The working principle, voltage gain and design rules in normal operation mode and hold-up mode are analyzed in detail. Finally, a prototype with 200~390V input voltage range and 48V/21A output is built and tested, which demonstrates the proposed converter has high efficiency and wide input voltage range.
Key wordsLLC resonant converter      auxiliary bi-directional switch      hold-up mode      wide input voltage range     
Received: 15 January 2019      Published: 28 February 2020
PACS: TM46  
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Yang Dongjiang
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Zhang Chenghui
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Yang Dongjiang,Duan Bin,Ding Wenlong等. An Improved LLC Resonant Converter with Auxiliary Bi-Directional Switch for Wide-Input-Voltage Range Applications[J]. Transactions of China Electrotechnical Society, 2020, 35(4): 775-785.
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