Isolated bidirectional DC-DC converter and control method thereof

The invention discloses an isolated bidirectional DC-DC converter and a control method thereof. The converter can be equivalent to a bridge arm multiplexed four-switch and CLLLC cascade converter. Theconverter is composed of a primary side direct current source, a secondary side direct current source, a primary side buck-boost inductor, a resonant inductor, a resonant capacitor, a direct currentbus capacitor, a filter capacitor, a transformer, a primary side power switch tube, a secondary side power switch tube and the like, wherein the four-switch converter and the CLLLC converter multiplexa primary side second switch bridge arm. The converter provided by the invention not only has the advantages of two converters and reduces the number of switching tubes, but also has a wide DC gain range; and the converter has the advantages of multiple input and output ports, bidirectional power flow, high conversion efficiency, wide input range and the like, can realize soft switching of all switching tubes, and is suita