Full-Bridge T-Type Three-Level LLC Resonant Converter with Wide Output Voltage Range

Kangjia Zhang, Kun Zhao, Xiaoxiao Yang, Muyang Liu and Zhigang Yao ()
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Kangjia Zhang: National Rail Transit Electrification and Automation Engineering Technology Research Center, Southwest Jiao Tong University, Chengdu 611756, China
Kun Zhao: National Rail Transit Electrification and Automation Engineering Technology Research Center, Southwest Jiao Tong University, Chengdu 611756, China
Xiaoxiao Yang: National Rail Transit Electrification and Automation Engineering Technology Research Center, Southwest Jiao Tong University, Chengdu 611756, China
Muyang Liu: National Rail Transit Electrification and Automation Engineering Technology Research Center, Southwest Jiao Tong University, Chengdu 611756, China
Zhigang Yao: Energy Research Institute, Nanyang Technological University, Singapore 639798, Singapore

Energies, 2025, vol. 18, issue 17, 1-23

Abstract: Traditional LLC resonant converters face significant challenges in wide-output-voltage-applications, such as limited voltage gain, efficiency degradation under wide-gain range, and increased complexity in magnetic component design. For example, in electric vehicle charging power modules, achieving wide output voltage typically relies on changing the transformer turns ratio or switching the series-parallel circuit configuration via relays, which prevents real-time dynamic adjustment. To overcome these limitations, this paper proposes a wide-gain-range control method based on a full-bridge T-type three-level LLC resonant converter, capable of achieving a voltage gain range exceeding six times. By integrating a T-type three-level bridge arm with PWM modulation and employing a variable-topology and variable-frequency control strategy, the proposed method achieves synergistic optimization for wide-output-voltage-applications. PWM modulation enables wide-range voltage output by dynamically adjusting both the converter topology and switching frequency. Finally, the proposed method is validated through circuit simulations and experimental results based on a full-bridge T-type three-level LLC converter prototype, demonstrating its effectiveness and feasibility.

Keywords: LLC resonant converter; T-type three-level; wide gain range (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: 2025
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