Switching converter based on ACOT control mode and turn-on time control circuit thereof

• Main Authors: ZHANG TAONA, NIU CHENGYU, YU XIANG
• Format: Patent
• Language: Chinese; English
• Published: 04.06.2024
• 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

The invention discloses a switching converter based on an ACOT control mode and a turn-on time control circuit of the switching converter. The turn-on time control circuit comprises a voltage sampling unit which is used for sampling the turn-on voltage drop of a synchronous switch tube so as to obtain a voltage sampling signal; the first transconductance amplification unit is used for obtaining a first voltage signal according to the voltage sampling signal; the second transconductance amplification unit is used for obtaining a second voltage signal according to the input voltage of the input end and the first voltage signal; the output stage unit is used for adjusting the connection state of the output stage unit according to the first voltage signal and the second voltage signal and generating a third voltage signal; the comparator unit is used for comparing the third voltage signal with the feedback voltage of the output voltage of the output end to generate a turn-off pulse, and the turn-on time control c