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    Start up circuit for commutation power supplies
    1.
    发明公开
    Start up circuit for commutation power supplies 有权
    AnlaufschaltungfürSchaltnetzteile

    公开(公告)号：EP1178592A1

    公开(公告)日：2002-02-06

    申请号：EP00830502.1

    申请日：2000-07-18

    Applicant: STMicroelectronics S.r.l.

    Inventor： Adragna, Claudio ,  Spini, Claudio

    IPC: H02M3/335

    CPC classification number: H02M1/36 ,  Y10S323/901

    Abstract: The present invention relates to a start up circuit for commutation power supplies (PWM) or DC/DC converters and to a commutation type power supply comprising such a start up circuit. In an embodiment the start up circuit for commutation power supplies having an input terminal (In) and an output terminal (OUT) comprises: a first current generator (41) able to supply a first prefixed current (I) connected between said input terminal (In) and a first node (45); said first node (45) is coupled to said output terminal (OUT); characterized by further comprising a second current generator (42) able to supply a second prefixed current (K*I) connected between said input terminal (In) and a first terminal of a first controlled switch (44); the value of said second prefixed current (K*I) is greater than or equal to the value of said first prefixed current (I); a second terminal of said first controlled switch (44) is connected to said first node (45); a control circuit (43, V3) of said first controlled switch (44) able to maintain closed said first controlled switch (44) in the case in which the voltage on said output terminal (OUT) is lower than a first prefixed voltage (V3).

    Abstract translation: 本发明涉及一种用于换向电源（PWM）或DC / DC转换器的启动电路以及包括这种启动电路的换向型电源。 在一个实施例中，具有输入端（In）和输出端（OUT）的换向电源的启动电路包括：第一电流发生器（41），其能够提供连接在所述输入端（ In）和第一节点（45）; 所述第一节点（45）耦合到所述输出端（OUT）; 其特征在于还包括能够提供连接在所述输入端子（In）和第一受控开关（44）的第一端子之间的第二预定电流（K * I）的第二电流发生器（42）。 所述第二预定电流（K * I）的值大于或等于所述第一前置电流（I）的值; 所述第一控制开关（44）的第二端子连接到所述第一节点（45）; 在所述输出端子（OUT）上的电压低于第一预定电压（V3）的情况下，所述第一受控开关（44）的控制电路（43,43）能够保持关闭所述第一受控开关（44） ）。

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