Multi-phase interleaving parallel DC-DC converter output current control method and system

• Main Authors: ZHAO JIANRONG, CHENG XINGBANG, BIAN HUIPING, TANG QIDI, DU ZHILIANG, WANG RUI, WANG LIN, HUANG HUI, YAO WEIZHENG, WEI YALONG, CHEN FENG, GONG PEIJIAO
• Format: Patent
• Language: Chinese; English
• Published: 07.05.2021
• 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 invention discloses a multi-phase interleaving parallel DC-DC converter output current control method and system. The method comprises the steps of: setting interruption frequency fi=N*fs, wherein fs is the switching frequency; setting the triangular carrier frequency of a pulse width modulation register PWM to be fs, employing a counting mode adopting increase and decrease counting, and setting triangular carrier phases to be sequentially lagged by 360 degrees/N. The method further comprises the following steps of: S1, when triggering interruption occurs, reading current information of N-phase bridge arms, and calculating a duty ratio of a power switch tube of an Sth-phase bridge arm when the current of the Sth-phase bridge arm is just the average value current; S2, converting the duty ratio into a PWM signal; and S3, driving a power switch tube of the Sth-phase bridge arm by using the generated PWM signal. The system comprises a calculation module, a digital control module and a driving module, wherein