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      • Three-Level Bi-Directional Half-Bridge CLLC Resonant Converter for DC Micro-Grid

        Hsuan-Yu Yueh,Jing-Yuan Lin,Haung-Jen Chiu,Chen-Yen Chu,Yu-Chen Chang,Sih-Yi Lee 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5

        A Three-Level Bi-Directional Half-Bridge CLLC Resonant DC-DC converter for DC micro-grid application is studied on this paper, which uses dual resonant tanks to achieve wide range voltage regulation and meanwhile employs bi-directional capability. All power switches on this converter can achieve ZVS function at the whole load and the voltage stress on all power switches at both sides can be clamped at half of input voltage and output voltage since the three-level circuit architecture using the proposed synchronous rectifier (SR) control, therefore, the voltage stresses of the transformer, resonant tanks, power switches and other components are only half compared with conventional half-bridge CLLC resonant converter, the downsizing rated of components selection can be more flexible. Finally, the laboratory prototype is built to verify the performance of voltage balancing on input/output capacitor, voltage stress on switches and efficiency, the measured efficiency can be up to 95.6% over different load conditions.

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