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    Frequency-selective circuit protection arrangements
    2.
    发明授权
    Frequency-selective circuit protection arrangements 失效
    频率选择电路保护装置

    公开(公告)号：US06437955B1

    公开(公告)日：2002-08-20

    申请号：US09536905

    申请日：2000-03-28

    Applicant: Hugh Duffy ,  John Midgley ,  Brian Thomas

    Inventor： Hugh Duffy ,  John Midgley ,  Brian Thomas

    IPC: H02H316

    CPC classification number: H02H3/025 ,  H02H3/085 ,  H02H3/334 ,  H02H9/026

    Abstract: A conventional ground fault circuit interrupter (GFCI) is modified to provide frequency-selective current protection. A control element is connected in series with the line path (or return path) of the GFCI, and a bypass element is connected in parallel with the combination of the control element and the line path (or return path) of the GFCI. Under normal conditions, little or no current flows through the bypass element. However, frequency response characteristics of the control and/or bypass elements are such that a frequency-selective component of the current (i.e. high-pass, low-pass or band-pass) is diverted through the bypass element. When the magnitude of the frequency-selective component reaches a predetermined value, the bypass current flow causes sensing of a resulting current imbalance and tripping of the GFCI.

    Abstract translation: 传统的接地故障电路断续器（GFCI）被修改以提供频率选择电流保护。 控制元件与GFCI的线路（或返回路径）串联连接，并且旁路元件与控制元件和GFCI的线路径（或返回路径）的组合并联连接。 在正常条件下，很少或没有电流流经旁路元件。 然而，控制和/或旁路元件的频率响应特性使得电流（即，高通，低通或带通）的频率选择分量被转移通过旁路元件。 当频率选择分量的幅度达到预定值时，旁路电流将导致感测到的电流不平衡和GFCI的跳闸。

    Two-terminal transistor PTC circuit protection devices
    3.
    发明授权
    Two-terminal transistor PTC circuit protection devices 有权
    两端晶体管PTC电路保护器件

    公开(公告)号：US06188556B1

    公开(公告)日：2001-02-13

    申请号：US09177666

    申请日：1998-10-22

    Applicant: Shukri Souri ,  Chris McCoy ,  Hugh Duffy ,  Adrian I. Cogan ,  Ram G. Bommakanti

    Inventor： Shukri Souri ,  Chris McCoy ,  Hugh Duffy ,  Adrian I. Cogan ,  Ram G. Bommakanti

    IPC: H02H504

    CPC classification number: H03K17/0826 ,  H02H3/025 ,  H02H5/042 ,  H02H9/026 ,  H03K2017/0806

    Abstract: The present invention provides a two-terminal, transistor-PTC, circuit protection device that has a reduced size and weight and is particularly suitable for use, for example, in portable electronic devices and high density electronic circuits. According to one embodiment of the present invention, a circuit protection device comprises a positive coefficient temperature (PTC) element and a bipolar transistor having base, collector, and emitter terminals. The PTC element is connected between the base and collector terminals of the transistor. The PTC element may be thermally coupled to the transistor and packaged with the transistor as a hybrid device. An electrical load may be connected to the collector terminal of the transistor. According to another embodiment of the present invention, a circuit protection device comprises a PTC element and a Darlington circuit having base, collector and emitter terminals. The PTC element is connected between the base and collector terminals of the Darlington circuit. The PTC element may be thermally coupled to the Darlington circuit and packaged with the Darlington circuit as a hybrid device. An electrical load may be connected to the collector terminal of the Darlington circuit. The Darlington circuit may also be a complementary Darlington circuit.

    Abstract translation: 本发明提供一种具有减小尺寸和重量的双端子晶体管PTC电路保护器件，并且特别适用于例如便携式电子设备和高密度电子电路中。 根据本发明的一个实施例，电路保护装置包括正系数温度（PTC）元件和具有基极，集电极和发射极端子的双极晶体管。 PTC元件连接在晶体管的基极和集电极端子之间。 PTC元件可以热耦合到晶体管并且与晶体管一起作为混合器件封装。 电负载可以连接到晶体管的集电极端子。 根据本发明的另一实施例，电路保护装置包括PTC元件和具有基极，集电极和发射极端子的达林顿电路。 PTC元件连接在达林顿电路的基极和集电极端子之间。 PTC元件可以热耦合到达林顿电路并与达林顿电路一起作为混合器件封装。 电负载可以连接到达林顿电路的集电极端子。 达林顿电路也可以是互补的达林顿电路。

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