同步整流管驱动方法、同步整流管电路和开关电源

• Format: Patent
• Language: Chinese
• Published: 06.11.2020
• 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

本发明公开了一种同步整流管驱动方法、同步整流管电路和开关电源，上述方法包括：检测变压器单元的次级绕组中的输出电流，并根据所述输出电流，生成第一驱动信号，根据同步整流管电路中变压器单元的次级绕组的电压信号，得到根据变压器单元初级绕组中的电平反转发生同步反转的保护信号；利用得到的保护信号对已有的第一驱动信号进行修正得到第二驱动信号；根据第二驱动信号驱动同步整流电路中的整流管。通过保护信号对第一驱动信号进行修正，能够消除第一驱动信号的延时现象，从而减小同步整流管的损坏的现象，提高了同步整流管电路和开关电源的性能。 A synchronous rectifier driving method, a synchronous rectifier circuit and a switching power supply are provided, and the method includes: detecting an output current in a secondary winding of a transformer unit, and generating a first driving signal according to the output current; obtaining a protection signal according to a voltage signal of the secondary winding of the transformer unit in a synchronous rectifier circuit; correcting the first driving signal by using the obtained protection signal to obtain a second driving signal; and driving a rectifier in the synchronous rectifier circuit according to the second driving signal.