MULTI-LEVEL DIRECT CURRENT CONVERTER, VOLTAGE CONTROL METHOD FOR FLYING CAPACITOR, AND CONTROL APPARATUS

• Main Authors: ZHONG, Shaohui, ZHAO, Jing, FAN, Juntao, WU, Zhiqing, WU, Rong
• Format: Patent
• Language: English; French; German
• Published: 26.06.2024
• 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

Embodiments of this application provide a multi-level direct current converter, a voltage control method for a flying capacitor, and a control apparatus. The multi-level direct current converter includes a controller, a flying capacitor, two switching transistor groups, and an inductor. The method for controlling a flying capacitor includes: in response to that an absolute value of a difference between a sampling voltage and a reference voltage of the flying capacitor is greater than a first threshold, adjusting a duty cycle difference between first switching transistors in two switching transistor groups or a phase difference between carriers of first switching transistors in two switching transistor groups based on a magnitude of an inductor current. According to embodiments of this application, a voltage of the flying capacitor can be controlled, to improve operation stability of the multi-level direct current converter.