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Experimental validation demonstrates high efficiency and reduced frequency range in a three-port converter, suggesting lower costs for solar-battery systems.
This brief proposes a high efficiency three-port topology with simple structure. The circuit integrates a buck-boost converter and a LLC resonant converter into one MOSFET bridge, which includes three switches, and thus, voltage regulation and battery management are controlled simultaneously. Also, the LLC resonant tank can be symmetrically powered by appropriately coordinating the control sequence, and the switching frequency range can be narrowed by connecting PV and battery in series. As a result, cost reduction is achievable when maintaining high efficiencies. The effect is validated by detailed analysis and experimental results.
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Li et al. (2023) studied this question.
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