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http://dx.doi.org/10.5762/KAIS.2010.11.2.497

Current Unbalance Improved Half-bridge LLC Resonant Converter using the Two Transformers  

Yoo, Doo-Hee (Department of Electronic Information Engineering, Soonchunhyang University)
Jeong, Gang-Youl (Department of Electronic Information Engineering, Soonchunhyang University)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.11, no.2, 2010 , pp. 497-507 More about this Journal
Abstract
This paper presents current unbalance improved half-bridge LLC resonant converter using the two transformers with different leakage inductances. The proposed converter resonates with the leakage inductance and magnetizing inductance of the transformer and the resonant capacitance. The converter operates in a wide load range and satisfies the zero voltage switching even under the light load. The series-parallel connected two transformers act as the transformers or the resonant inductances according to the operational modes, and the separate output filter inductance in the transformer secondary is not needed using the leakage inductance. The current unbalance of the secondary diode rectifier is improved using the different leakage inductances of the two transformers and the asymmetrical pulse-width modulation (PWM). In this paper, the operational principle of the converter is explained by the modes, and the design example for the prototype is also shown. To validate the performance of the converter, the prototype is implemented as the designed circuit parameters and the good performance of the proposed converter is shown through the experimental results
Keywords
Half-bridge; LLC resonant converter; Two transformer; Different leakage inductance; Asymmetrical PWM;
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