Unified Inductor Type Based Linear Resonant Hybrid Converter for Wide Voltage Range Applications

Jingtao Xu, Hao Wang and Bin Liu ()
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Jingtao Xu: School of Traffic & Transportation Engineering, Central South University, Changsha 410075, China
Hao Wang: School of Electrical Engineering, Guangxi University, Nanning 530004, China
Bin Liu: School of Electrical Engineering, Guangxi University, Nanning 530004, China

Energies, 2025, vol. 18, issue 10, 1-18

Abstract: Pulse frequency modulation (PFM) is widely used in LLC resonant converters. However, in wide voltage applications, the switching frequency range is very wide, which affects the performance of magnetic components and filters. In order to achieve wide voltage gain in a narrow frequency range, this paper proposes a unified inductor type based linear resonant hybrid converter (UITBLRHC). The resonant inductor and excitation inductor are unified, and the resonant tank with equal inductance ratio is achieved. Hence, the output voltage can be adjusted within a very narrow frequency range. In addition, the parameters and operating modes of the two inductors are exactly the same. Therefore, the types of inductors can be reduced, and the magnetic flux and heat distribution between the two inductors are more uniform. Finally, an 800W prototype was built. The proposed solution can achieve twice the voltage gain within a frequency range of 1.25 times. The experimental results prove the reliability and validity.

Keywords: unified inductor type; linear resonant; wide voltage range; zero voltage switching (ZVS) (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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