公开(公告)号：EP1936792A1

公开(公告)日：2008-06-25

申请号：EP06127185.4

申请日：2006-12-22

Applicant: STMicroelectronics Design and Application S.R.O.

Inventor： Tlaslak, Ondrej ,  Janik, Bohumil ,  Burda, David ,  Picq, Julien ,  Hukel, Miroslav

IPC: H02M3/158 ,  H02M1/38

CPC classification number: H02M1/38 ,  H02M3/1588 ,  H02M2001/0009 ,  Y02B70/1466

Abstract: A synchronous rectifier, including an energy storage element (L) having a terminal (LX); a power supply input (V cc ), connected to the terminal of the storage element in a first time interval; a reference line connected to the terminal of the storage element in a second time interval; and a zero comparator (24), coupled to the terminal (LX) of the storage element (L) to detect a current (I L ) flowing in the energy storage element and disconnect the terminal of the storage element from the reference line upon detecting a zero current, the zero comparator having an offset (Voff) and a propagation time; the zero comparator further having an offset control input (24a) and an output. An offset regulating loop (21-26) is coupled between the output of the zero comparator (24) and the offset control input and regulates the offset of the zero comparator to compensate the propagation time.

Abstract translation: 一种同步整流器，包括具有端子（LX）的能量存储元件（L）; 在第一时间间隔连接到存储元件的端子的电源输入（V cc）; 在第二时间间隔连接到所述存储元件的终端的参考线; 和零比较器（24），其耦合到存储元件（L）的端子（LX），以检测在能量存储元件中流动的电流（IL），并且在检测到存储元件时将存储元件的端子与参考线断开 零电流，零比较器具有偏移（Voff）和传播时间; 零比较器还具有偏移控制输入（24a）和输出。 偏移调节回路（21-26）耦合在零比较器（24）的输出端和偏移控制输入端之间，并调节零比较器的偏移以补偿传播时间。