公开(公告)号：US20090244932A1

公开(公告)日：2009-10-01

申请号：US12191589

申请日：2008-08-14

Applicant: Chun-Ming Lin

Inventor： Chun-Ming Lin

IPC: H02M3/335

CPC classification number: H02M3/33592 ,  Y02B70/1475

Abstract: A synchronous rectifying apparatus suitable for use in a forward synchronous converter having a transforming unit with a primary and secondary side, and a first and second rectifying switches coupled to the secondary side is provided. The synchronous rectifying apparatus has a condition detecting unit and a synchronous rectifying controller. The condition detecting unit; coupled to the secondary side of the transforming unit, for detecting if the operation condition of the forward synchronous converter is at boundary between discontinuous current mode and continuous current mode or under discontinuous current mode based on the rising slope of the secondary side voltage of the transforming unit. If so, the condition detecting unit outputs a reset signal. The synchronous rectifying controller, coupled to the secondary side of the transforming unit and the condition detecting unit, to turn off the second rectifying switch for a predetermined time period in response to the reset signal.

Abstract translation: 提供一种适用于具有初级侧和次级侧的变换单元的正向同步转换器以及耦合到次级侧的第一和第二整流开关的同步整流装置。 同步整流装置具有条件检测单元和同步整流控制器。 条件检测单元; 耦合到变换单元的次级侧，用于检测正向同步转换器的操作状态是否处于不连续电流模式和连续电流模式之间或基于不连续电流模式的边界，基于转换的次级侧电压的上升斜率 单元。 如果是，则条件检测单元输出复位信号。 耦合到变压单元和状态检测单元的次级侧的同步整流控制器响应于复位信号将第二整流开关断开预定时间段。