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Expandable Wide-output Variable-mode Interleaved Parallel LLC Converter
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Jie ZHANG1, 2, Lin YANG1, Chen ZOU1, Ci XIAO1, Lin LIU1
Journal of Power Supply | 2025, 23(2) : 1 - 10
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Journal of Power Supply | 2025, 23(2): 1-10
• DC-DC Converters •
Expandable Wide-output Variable-mode Interleaved Parallel LLC Converter
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Jie ZHANG1, 2, Lin YANG1, Chen ZOU1, Ci XIAO1, Lin LIU1
Affiliations
  • 1 Hubei Engineering Research Center for Safety Monitoring of New Energy and Power Grid Equipment, Hubei University of Technology, Wuhan 430068, China
  • 2 Xiangyang Industrial Institute of Hubei University of Technology, Xiangyang 441100, China
Published: 2025-03-30 doi: 10.13234/j.issn.2095-2805.2025.2.1
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Limited by the switching frequency, the frequency-controlled LLC resonant converter is difficult to achieve a wide output voltage range. To solve this problem, an expandable variable-mode interleaved parallel LLC resonant converter is studied. The secondary-side of this converter adopts a voltage doubling rectifier circuit, which can work in a parallel or series mode according to different switch combinations of two half-bridges on the primary-side, and it can adapt to the wide output voltage range of 1-3N times. A fixed-frequency PWM control method is proposed. In the middle region between the parallel and series modes, the fixed switching frequency is taken as the resonant frequency, and the duty cycle of one bridge arm is changed to realize voltage control. PSIM simulation results show that the wide output voltage range of 1-3N times can be realized by expanding 2N resonator cavities. The experimental results of a 100 W prototype demonstrate that the wide output voltage range of 1-3 times can be achieved with two half-bridges and two resonant cavities, and the effectiveness of the proposed converter and its control strategy was verified.

Resonant converter  /  wide output voltage  /  fixed-frequency PWM control
Jie ZHANG, Lin YANG, Chen ZOU, Ci XIAO, Lin LIU. Expandable Wide-output Variable-mode Interleaved Parallel LLC Converter[J]. Journal of Power Supply, 2025 , 23 (2) : 1 -10 . DOI: 10.13234/j.issn.2095-2805.2025.2.1
Funding
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  • Key Research and Development Program in Hubei Province in 2020(2020BBB084)
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Year 2025 volume 23 Issue 2
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Article Info
doi: 10.13234/j.issn.2095-2805.2025.2.1
  • Receive Date：2022-04-09
  • Online Date：2025-07-09
  • Published：2025-03-30
Article Data
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History
  • Received：2022-04-09
  • Revised：2022-06-09
  • Accepted：2022-06-24
Funding
Key Research and Development Program in Hubei Province in 2020(2020BBB084)
Affiliations
    1 Hubei Engineering Research Center for Safety Monitoring of New Energy and Power Grid Equipment, Hubei University of Technology, Wuhan 430068, China
    2 Xiangyang Industrial Institute of Hubei University of Technology, Xiangyang 441100, China
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https://castjournals.cast.org.cn/joweb/dyxb/EN/10.13234/j.issn.2095-2805.2025.2.1
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小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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