Analysis and Design of Single-Stage AC/DC $LLC$ Resonant Converter

摘要

Analysis and design of a single-stage $LLC$ resonant converter are proposed. A single-stage converter uses only one control signal to drive two power converters, a power factor corrector (PFC) converter and a dc/dc converter, for reducing the cost of the system. However, this simplicity induces power imbalance between two converters, and then, the bus voltage between two converters drifts and becomes unpredictable. To ensure that the bus capacitor voltage can be kept in a tolerable region, the characteristics of a PFC converter and an $LLC$ tank are investigated, and then, a design procedure is proposed correspondingly. Finally, a single-stage $LLC$ resonant converter is implemented to verify the analysis.