Abstract
The paper focuses on the galvanically isolated series-resonant dc-dc converter (SRC) operating at low values of the quality factor of the resonant tank. This topology is considered as a step-up front-end dc-dc converter with buck-boost functionality for integration of renewable energy sources in dc microgrids. The paper proposes the algorithm for soft transitions between half-bridge and full-bridge configurations in the input and output sides of the converter. The converter operates in a wide input voltage range with four control modes and performs soft transitions between them. The algorithm allows for linear recharging of blocking capacitors and stabilizing input voltage and current during transition intervals. The theoretical findings are corroborated with experimental study of converter capability to perform global maximum power point tracking of a photovoltaic module.
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