Zero-Vector-Injection Based Current Sharing Control of Interleaved Full-Bridge LLC Resonant Converters

Xuanlyu Wu, Dejie Luo, Panpan Wu, Xin Zhao, Zhen Kang and Xiaohua Wu
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Xuanlyu Wu: School of Automation, Northwestern Polytechnical University, 1 Dongxiang Road, Chang’an District, Xi’an 710129, China
Dejie Luo: School of Automation, Northwestern Polytechnical University, 1 Dongxiang Road, Chang’an District, Xi’an 710129, China
Panpan Wu: School of Automation, Northwestern Polytechnical University, 1 Dongxiang Road, Chang’an District, Xi’an 710129, China
Xin Zhao: School of Automation, Northwestern Polytechnical University, 1 Dongxiang Road, Chang’an District, Xi’an 710129, China
Zhen Kang: School of Automation, Northwestern Polytechnical University, 1 Dongxiang Road, Chang’an District, Xi’an 710129, China
Xiaohua Wu: School of Automation, Northwestern Polytechnical University, 1 Dongxiang Road, Chang’an District, Xi’an 710129, China

Energies, 2020, vol. 13, issue 2, 1-15

Abstract: Interleaved LLC resonant converters are widely used in various fields. However, interleaved LLC converters under Pulse Frequency Modulation (PFM) will lose the regulation of individual phases, causing a load sharing problem. Existing load sharing solutions have limitations; for example, phase shedding and current sharing cannot be realized at the same time. This paper proposed a novel current sharing method for interleaved full-bridge LLC resonant converters. Based on Zero-Vector-Injection, the voltage applied to the resonant tank is controlled to compensate for the difference in gain caused by component tolerance. The modulation strategy is proposed to maintain soft switching after Zero-Vector-Injection, and the phase shedding technique is also used to improve the efficiency at a light load. The detailed theoretical analysis and implementation method are proposed and validated using simulations. Experiments are also carried out to verify the feasibility of the proposed strategy based on a 2-phase 1.8 kW prototype.

Keywords: LLC converter; current sharing; zero voltage switching (ZVS); zero current switching (ZCS) (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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