Resonant bidirectional conversion circuit and converter

The embodiment of the invention provides a resonant bidirectional conversion circuit and a converter. The resonant bidirectional conversion circuit comprises a primary side capacitor, three primary side bridge arms, three three-port resonant cavities, three transformers, three secondary side bridge arms, and a secondary side capacitor. The first port of each of the three-port resonant cavities is connected to a corresponding primary side bridge arm, the second port of each of the three-port resonant cavities is connected to the grounding end of a corresponding primary side bridge arm, the third port of each of the three-port resonant cavities is connected to a corresponding transformer, two ends of each of the secondary side bridge arms are connected to two ends of the secondary side capacitor, and each transformer is connected to a corresponding secondary side bridge arm. Through the resonant bidirectional conversion circuit provided by the embodiment of the invention, the bidirectional conversion can be realized, a rectifier gain curve and an inverter gain curve are almost the same, the control is simple, the reliability is high, natural current sharing can be realized, the adding of an extra current sharing circuit is avoided, and the cost is reduced.