公开(公告)号：EP4071991A1

公开(公告)日：2022-10-12

申请号：EP22167240.5

申请日：2022-04-07

申请人： Silergy Semiconductor Technology (Hangzhou) Ltd

发明人： WANG, Longqi ,  WANG, Hanxiang

IPC分类号： H02M3/00 ,  H02M7/48 ,  H02M1/00 ,  H02M1/08 ,  H02M1/32 ,  H02M1/36 ,  H03K17/08 ,  H03K17/16

摘要： A control circuit, a control method and a resonant converter are provided. The resonant converter includes a first power switch transistor and a second power switch transistor. The second power switch transistor and the first power switch transistor are coupled in series sequentially between a ground potential terminal and a high potential terminal at an input side of the resonant converter. The control circuit includes a bridge midpoint voltage control circuit. The bridge midpoint voltage control circuit is configured to control a bridge midpoint voltage in a process of starting the resonant converter, to prevent a voltage of a resonant capacitor from being excessively high in a time period during which the second power switch transistor is on. The bridge midpoint voltage represents a voltage at a common terminal of the first power switch transistor and the second power switch transistor.