Energy conversion circuit and system composed of same

The utility model relates to the technical field of energy conversion, and discloses an energy conversion circuit and a system composed of the same. The circuit is used for bidirectional energy conversion between a three-phase alternating-current and a storage battery. The energy conversion circuit comprises a transformer, a filter, a rectifier inverter unit, a power on buffer unit, an energy storage unit, a chopper unit and an output filter unit, wherein the transformer, the filter, the rectifier inverter unit, the power on buffer unit, the energy storage unit, the chopper unit and the output filter unit are successively connected. The primary side of the transformer is connected with the three-phase alternating-current. The output filter unit is connected with the storage battery. According to the utility model, bidirectional energy conversion is realized; when the storage battery is charged, the power on buffer unit can carry out power on buffer on direct current rectified by the rectifier inverter unit; a