公开(公告)号：US20140285163A1

公开(公告)日：2014-09-25

申请号：US14222451

申请日：2014-03-21

Applicant: Chengdu Monolithic Power Systems Co., Ltd.

Inventor： Sicon Lin ,  Yiqing Jin ,  Yuancheng Ren ,  Junming Zhang

IPC: H02M1/42

CPC classification number: H02M1/4225 ,  H02M1/40 ,  H02M1/42 ,  Y02B70/126 ,  Y02P80/112

Abstract: A PFC circuit includes: a switching circuit having a power switch; an on time control circuit for controlling an on time period of the power switch; a first off time control circuit; a second off time control circuit; and a logic circuit selectively controls the power switch working under CCM or DCM; when working under CCM, the first off time control circuit controls an off time period of the power switch and when working under DCM, the second off time control circuit controls the off time period of the power switch.

Abstract translation: PFC电路包括：具有电源开关的开关电路; 用于控制电源开关的接通时间段的准时控制电路; 第一关断时间控制电路; 第二关闭时间控制电路; 并且逻辑电路选择性地控制在CCM或DCM下工作的电源开关; 当在CCM下工作时，第一关闭时间控制电路控制电源开关的关闭时间段，并且在DCM下工作时，第二关断时间控制电路控制电源开关的关闭时间段。