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This paper extends the application range of a high efficiency and high power density dc-dc converter, a three-phase LLC resonant converter equipped with split resonant capacitors. The circuit topology features its resonant capacitor network. One resonant capacitor is connected to the dc input terminal, and the other is interconnected to the other phases, enabling natural current balancing and phase shedding. This paper develops three extended topologies based on the three-phase LLC resonant converter. A voltage-doubler rectifier for a higher output voltage range reduces the output voltage ripple without compromising the single-phase operation capability. Tuning the split ratio for a higher output current range reduces the currents in operation around the resonant frequency. An auxiliary switch for a wide input voltage range reduces the currents in operation below the resonant frequency. Furthermore, this paper introduces a new structure to connect multiple LLC resonant converters for a wide power range by expanding the capacitor network. A 4-kW experimental prototype based on the structure achieves a high efficiency over 99% from 5% to full load even with Si MOSFETs.
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Chiba et al. (2022) studied this question.