Isolated DC-DC converter topology with wide input voltage and control method thereof

The invention discloses an isolated DC-DC converter topology with wide input voltage and a control method thereof. The converter topology comprises an isolation transformer, a primary side structure and a secondary side structure, wherein the primary side structure and the secondary side structure are connected with the isolation transformer. The primary side structure comprises a first half-bridge formed by a switching tube, a second half-bridge formed by a switching tube, a direct current bus capacitor and a bridge arm inductor. The secondary side structure comprises a rectification structure and an output filter capacitor, wherein the rectification structure is composed of a rectification tube and an output inductor. A primary side switch tube of the converter adopts a control mode of tube synchronization and upper and lower tube complementation, the effective value of the midpoint alternating current voltage of a bridge arm is kept basically unchanged, and no follow current stage exists. The primary side