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113 条记录 (耗时 0.02 秒)

    An integrated circuit with automatic compensation for deviations of the capacitances from nominal values
    59.
    发明公开
    An integrated circuit with automatic compensation for deviations of the capacitances from nominal values 失效
    有能力的期望值的偏差的自动补偿集成电路

    公开(公告)号：EP0794609A1

    公开(公告)日：1997-09-10

    申请号：EP96830103.6

    申请日：1996-03-08

    申请人： SGS-THOMSON MICROELECTRONICS s.r.l. ,  CO.RI.M.ME. CONSORZIO PER LA RICERCA SULLA MICROELETTRONICA NEL MEZZOGIORNO

    发明人： Bruccoleri, Melchiorre ,  Cosentino, Gaetano ,  Demicheli, Marco ,  Pisati, Valerio

    IPC分类号： H03B1/00 ,  H03L7/099

    CPC分类号： H03L7/0805 ,  H03L7/099

    摘要： The system described comprises various circuit units (10, 11, 12) each having a capacitor (C0, C1, C2) and charging means (G0, G1, G2) for defining a quantity depending upon the ratio (I/C) between the charging current and the capacitance of the capacitors.
    In order to compensate automatically for deviations of the actual capacitances from the nominal capacitances due to fluctuations in the parameters of the integrated-circuit manufacturing process, the system has a phase-locked loop (PLL) which uses one (10) of the circuit units as an adjustable oscillator, and current transducer means (17) which regulate the charging currents of the capacitors (C1, C2) of the circuit units (11, 12) in dependence on the regulated charging current of the capacitor (C0) of the oscillator (10) or the error current of the PLL loop.

    摘要翻译： 所描述的系统包括各种电路单元（10，11，12），每个具有一个电容器（C0，C1，C2）和用于在所述之间的比率（I / C）定义的量DEPENDING充电装置（G0，G1，G2） 充电电流和电容器的电容。 为了由于在集成电路制造工艺的参数的波动自动为从标称电容的实际电容的偏差进行补偿，该系统具有电路单元的锁相环（PLL），其使用（10）之一 作为可调振荡器，和电流传感器装置（17）从而调节电容器的电路单元的充电电流（C1，C2）（11，12）在根据所述振荡器的电容器的调节充电电流（C0） （10）或者PLL环路的误差电流。

    Protection method for power transistors, and corresponding circuit
    60.
    发明公开
    Protection method for power transistors, and corresponding circuit 失效
    Verfahren zum Schutz von Leistungstransistoren undübereinstimmendeSchaltung

    公开(公告)号：EP0782235A1

    公开(公告)日：1997-07-02

    申请号：EP95830550.0

    申请日：1995-12-29

    申请人： SGS-THOMSON MICROELECTRONICS s.r.l. ,  CO.RI.M.ME. CONSORZIO PER LA RICERCA SULLA MICROELETTRONICA NEL MEZZOGIORNO

    发明人： Pulvirenti, Francesco ,  Bontempo, Gregorio ,  Gariboldi, Roberto

    IPC分类号： H02H1/00 ,  H03K17/082

    CPC分类号： H03K17/0822 ,  H03K2017/0806 ,  H03K2217/0063 ,  H03K2217/0072

    摘要： The present invention is aimed at providing a method and a circuit for protecting the output stage of a power actuator against voltage transients of the surge type. In particular, it provides protection against voltage surge transients of the kind described by International Standard IEC 801-5, for a power transistor contained in the output stage of the actuator.
    The method of this invention provides for:

    the utilization of the power transistor (PW) intrinsic diode (DP) for dumping the transient energy to one of the supply generator terminals during a positive transient; and
    the utilization of the power transistor (PW) restoration feature to the on state for dumping the energy thereinto during a negative transient, while simultaneously inhibiting the current limiting function.

    The power transistor (PW) is turned on again, and the current limiting circuit (4) inhibited, by the following steps:

    a) generating an electric signal which is substantially proportional to the voltage appearing at the output terminal (OUT) of the actuator;
    b) driving the control terminal (G) of the power transistor (PW) by means of said electric signal, and causing said transistor to conduct, while simultaneously disabling the current limiting circuit (4) when the output voltage exceeds a predetermined threshold; and
    c) allowing the transient energy to be dissipated to the power transistor (PW).

    摘要翻译： 本发明的目的在于提供一种用于保护功率执行器的输出级以防止浪涌型电压瞬变的方法和电路。 特别地，它提供了针对包含在执行器的输出级中的功率晶体管的国际标准IEC 801-5所述类型的电压浪涌瞬变的保护。 本发明的方法提供：功率晶体管（PW）本征二极管（DP）用于在正瞬变期间将瞬态能量倾倒到一个供电发生器端子; 以及在负瞬态期间将功率晶体管（PW）恢复特性应用于导通状态以将能量倾倒在其中，同时抑制电流限制功能。 功率晶体管（PW）再次导通，并且限流电路（4）通过以下步骤来禁止：a）产生基本上与致动器的输出端（OUT）处出现的电压成比例的电信号 ; b）通过所述电信号驱动功率晶体管（PW）的控制端（G），并使所述晶体管导通，同时当所述输出电压超过预定阈值时禁止所述限流电路（4）; 以及c）允许瞬态能量被耗散到功率晶体管（PW）。