Dead-time optimization control method suitable for SiC-based bridge arm power circuit

• Main Authors: LIU SAIDE, ZHANG YING, DONG YAOWEN, YU DUNYUE, QIN HAIHONG
• Format: Patent
• Language: Chinese; English
• Published: 23.11.2016
• 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 dead-time optimization control method suitable for a SiC-based bridge arm power circuit. The time for reducing grid voltage to reach threshold voltage, channel current reduction time and drain-source voltage rising time are comprehensively compared, and maximum dead time is preset; the time for reducing grid voltage to reach threshold voltage can be calculated according to a grid drive equivalent circuit; the channel current reduction time is selected in an offline state and under heavy-load and high-temperature conditions; the grid-source voltage reduction edge and the drain-source voltage reduction edge of a switch tube are detected by adopting upper and lower tube auxiliary circuits through edge detector, and their difference is the drain-source voltage rising time. By comparing these times, an optimal dead time is output, the optimal dead time consumed after a turning-off signal of the switch tube is output is the turning-on signal output moment of the corresponding switch tube.