BIDIRECTIONAL DIRECT CURRENT-DIRECT CURRENT CONVERSION APPARATUS AND CHARGING PILE

A bidirectional DC-DC conversion apparatus and a charging pile. The bidirectional DC-DC conversion apparatus includes a first power conversion circuit, a second power conversion circuit, a three-phase transformer, three phase resonant circuits, a resonant switching switch circuit, and an inductor circuit. Each phase of resonant circuit includes a first capacitor and a first inductor that are connected in series. One end of each phase of resonant circuit is connected to the first power conversion circuit, and the other end of each phase of resonant circuit is connected to the second power conversion circuit via the three-phase transformer. The resonant switching switch circuit is configured to connect a circuit between either of two ends of each phase of resonant circuit and the inductor circuit to enable each phase of resonant circuit and the inductor circuit to form an LLC resonant circuit.