Capacitor clamping type three-level direct-current converter adopting asymmetric bidirectional switch

The invention discloses a capacitor clamping type three-level direct-current converter adopting an asymmetric bidirectional switch. The capacitor clamping type three-level direct-current converter comprises a voltage source Vin, a voltage dividing capacitor Cin1, a voltage dividing capacitor Cin2, a primary side inversion unit and a transformer T. Input high-voltage direct current obtains alternating-current square waves on the primary side of the transformer by controlling on and off of a switch tube, passes through the transformer T, then is connected with a rectifier bridge on the secondaryside of the transformer, and then outputs direct-current voltage through the filter circuit. The problem of unbalanced current existing in an existing three-level circuit is solved. The turn-off current of a switching device in the circuit is reduced. The current stress of the switch tube is reduced. Zero-voltage zero-current turn-on and turn-off of the switch tube are achieved. The loss of the whole circuit is reduced.