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A single-bridge interleaved three-level LLC resonant converter with current sharing capability for fuel cell system
Qianqi Zhao1, Xu-Feng Cheng2, Yazhuo Li1
1School of Mechanical Engineering, Hebei University of Science and Technology, Shijiazhuang, 050018, People's Republic of China.
Scientific Reports
|July 17, 2024
Summary
This study introduces a wide gain, single-bridge interleaved three-level LLC resonant converter. The novel design achieves high efficiency and excellent current sharing, making it suitable for diverse applications.
Area of Science:
- Electrical Engineering
- Power Electronics
- Resonant Converters
Background:
- Traditional LLC resonant converters face limitations in gain range and current sharing.
- Need for efficient and scalable power conversion solutions in various applications.
Purpose of the Study:
- To propose and analyze a novel wide gain single-bridge interleaved three-level LLC resonant converter.
- To demonstrate improved current sharing capability and high efficiency.
- To validate the converter's performance through experimental testing.
Main Methods:
- Design and theoretical analysis of a single-bridge interleaved three-level LLC resonant converter.
- Implementation of a 600 W experimental prototype.
- Experimental validation focusing on gain range, current ripple, current sharing, and efficiency.
Main Results:
- The proposed converter achieves a wide gain range and reduced current ripple.
- Demonstrated good current sharing capability with a resonant element tolerance of 10% (current error < 12%).
- Achieved a peak efficiency of 95.8%.
Conclusions:
- The novel three-level LLC resonant converter offers significant advantages over conventional designs.
- The design provides a scalable and efficient solution with enhanced current sharing.
- Experimental results confirm the theoretical analysis and practical viability.
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