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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.
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Received: 15 January 2019
Published: 28 February 2020
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2020, Vol. 35 
