CONVERSION APPARATUS WITH THREE-LEVEL SWITCHING CIRCUIT AND METHOD OF OPERATING THE SAME

A conversion apparatus (100,100') with a three-level switching circuit includes a DC conversion module (10,10'), a three-level circuit (20), and a control unit (40). The three-level circuit (20) includes a bridge arm assembly (22) and a capacitor assembly (24). The capacitor assembly (24) includes a first capacitor (242) and a second capacitor (244) connected to the first capacitor (242) in series. The DC conversion module (10,10') has a positive output end (142) and a negative output end (144), and the positive output end (142) and the negative output end (144) are coupled to the bridge arm assembly (22). The control unit (40) controls the switching of a second switch unit (224) and a third switch unit (226) to make the three-level circuit (20) operate in a first state where the positive output end (142) and the negative output end (144) are connected to the first capacitor (242), and operate in a second state where the positive output end (142) and the negative output end (144) are connected to the second capacitor (244).