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ZVS Analysis and Design of Four-Port CLLC Converters for Automotive Battery Chargers
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| Author(s) |
Zhen HUANG, Mattia IURICH, Thomas LANGBAUER, Franz VOLLMAIER, Roberto PETRELLA, Michael HARTMANN |
| Abstract |
Resonant DC/DC converters in DC transformer (DCX) operating mode emerged to be an optimal solution for isolated DC/DC converters due to its simple circuit structure and soft-switching behavior of the primary and secondary switches. The zero voltage switching (ZVS) condition in a bidirectionalCLLC DCX converter is, however, dependent on dead-time, resonant tank parameters and load current. In this work the ZVS behavior of this structure is fully analyzed. Detailed circuital and closed-form analytical model of the time behavior of the resonant inductor and stray capacitance currents, as well as the drain-source voltage of the power devices, during the dead-time interval is provided, aiming an optimal prediction/selection based on the resonant tank parameters and load current. Validation ofthe proposed analytical calculations is done under the simplifying assumption of constant output capacitance of the power devices during the switching transient. Even under a limited validity ofthe proposed analysis under the considered strong assumption, it anyhow allows to gain further insights on the ZVS operation as a function of main design parameters of the converter by afast analytical approach. A laboratory prototype of a DC/DC converter for on-board charger (OBC) applications with an output power of 11 kW has been constructed and preliminary experimental results are provided. |
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| Filename: | 0060-epe2025-full-15514229.pdf |
| Filesize: | 1.842 MB |
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| Type |
Members Only |
| Date |
Last modified 2025-08-31 by System |
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