NEUTRAL-POINT VOLTAGE BALANCE CONTROL IMPROVEMENT METHOD FOR THREE-LEVEL BIDIRECTIONAL DCDC CONVERTER

• Main Authors: GUO, Qiliang, ZOU, Cunzuo, BI, Hongda, XU, Mingxia, LIU, Jinjing
• Format: Patent
• Language: Chinese; English; French
• Published: 04.04.2024
• Subjects: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS; CONTROL OR REGULATION THEREOF; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION

The present invention provides a neutral-point voltage balance control improvement method for a three-level bidirectional DCDC converter, comprising the following steps: respectively sampling an upper bridge arm supporting capacitor voltage, a lower bridge arm supporting capacitor voltage, and an inductor current; and according to a relationship between the upper bridge arm supporting capacitor voltage and the lower bridge arm supporting capacitor voltage and the direction of the inductor current, selecting a switching tube adjusting a duty ratio, and controlling the balance of the neutral-point voltage of the three-level bidirectional DCDC converter. The inductor current can also be selected from an input current or an output current in a DCDC converter circuit, and the balance of the neutral-point voltage of the three-level bidirectional DCDC converter is controlled; and the neutral-point voltage out-of-control problem caused by factors such as zero drift of a current detection circuit is avoided by reasona