公开(公告)号：US20240313636A1

公开(公告)日：2024-09-19

申请号：US18602432

申请日：2024-03-12

申请人： SHANGHAI BRIGHT POWER SEMICONDUCTOR CO., LTD.

发明人： Rulong JIANG ,  Zhen ZHU ,  Xiaoru GAO ,  Yi ZHANG ,  Ge YANG

IPC分类号： H02M1/14 ,  H02M3/156 ,  H03F3/45

CPC分类号： H02M1/143 ,  H02M3/156 ,  H03F3/45475 ,  H03F3/456

摘要： The present invention provides a built-in ripple injection circuit and a control chip, in which a divided feedback voltage is obtained by division of an output voltage by a feedback circuit, and high-frequency ripple in the output voltage is obtained by an operational amplifier and a first capacitor. Moreover, the high-frequency ripple is injected at a third terminal of a source follower. As a result, the feedback voltage is a superimposition of the divided feedback voltage with the high-frequency ripple. This can enhance stability and interference resilience of a power supply system operating in a ripple-based COT control mode. Further, the built-in ripple circuit can be integrated in the control chip. This dispenses with the use of a large capacitor and satisfactorily addresses applications requiring on-chip integration of the feedback circuit, reducing the cost of the power supply system.