Hybrid five-level bidirectional dc/dc converter and voltage match modulation method thereof

A hybrid five-level bidirectional DC/DC converter, comprising a first input filter capacitor Cinp and a second input filter capacitor Cinn, an output filter capacitor Co, a DC voltage source, a primary-side hybrid five-level unit, a primary-side two-level half bridge, a secondary-side single-phase full bridge H2, a high-frequency isolation transformer M1, a high-frequency inductor Ls, and a controller;

• wherein
• a positive pole of a DC bus of the primary-side hybrid five-level unit is coupled to a positive pole of the corresponding DC voltage source and to a positive pole of the input filter capacitor Cinp respectively, a negative pole of the DC bus of the primary-side hybrid five-level unit is coupled to a negative pole of the corresponding DC voltage source and to a negative pole of the input filter capacitor Cinn respectively, a terminal of the primary-side hybrid five-level unit is coupled to a midpoint between the first input filter capacitor Cinp and the second input filter capacitor Cinn connected in series, the primary-side hybrid five-level unit is coupled to a primary side of the high-frequency isolation transformer M1 through the high-frequency inductor Ls, and a midpoint of the primary-side two-level half bridge is coupled to another terminal of the primary side of the high-frequency transformer;
• a positive pole of a DC bus of the secondary-side single-phase full bridge H2 is coupled to a positive pole of a corresponding DC load and to a positive pole of the output filter capacitor Co respectively, a negative pole of the DC bus of the secondary-side single-phase full bridge H2 is coupled to a negative pole of the corresponding DC load and to a negative pole of the output filter capacitor Co respectively, and an AC side of the secondary-side single-phase full bridge H2 is coupled to a secondary side of the high-frequency isolation transformer;
• and
• an input terminal of a control signal of the primary-side hybrid five-level unit, an input terminal of a control signal of the primary-side two-level half bridge, and an input terminal of a control signal of the secondary-side single-phase full bridge are respectively coupled to an output terminal of a switch signal corresponding to the controller.