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236 条记录 (耗时 0.011 秒)

    Line supervisory circuit
    131.
    发明授权
    Line supervisory circuit 失效

    公开(公告)号：US3889069A

    公开(公告)日：1975-06-10

    申请号：US43934674

    申请日：1974-02-04

    申请人： BELL TELEPHONE LABOR INC

    发明人： AULT CYRUS FRANK

    IPC分类号： H04M3/22 ,  H03K17/82 ,  G11C11/14

    CPC分类号： H04M3/2272

    摘要： A line supervisory circuit for determining the on-hook or offhook status of a subscriber line subset responsive to current in the subscriber line. The line supervisory circuit includes a magnetic element having drive windings, interrogate windings, and sense windings. A magnetoresistor is connected in shunt across each drive winding. The magnetoresistors are magnetically cross coupled to the drive windings whereby undesirable current, which may be present in only one drive winding, is shunted so that a false off-hook indication does not result.

    Magnetic sensor
    132.
    发明授权
    Magnetic sensor 失效
    磁传感器

    公开(公告)号：US3671759A

    公开(公告)日：1972-06-20

    申请号：US3671759D

    申请日：1970-09-02

    申请人： NORTHERN ELECTRIC CO

    发明人： DOPHEIDE OTTO WALTER

    IPC分类号： H03K17/82 ,  H04M3/22

    CPC分类号： H04M3/2272 ,  H03K17/82

    摘要： A ferrod sensor comprising an elongated ferrite stick having a pair of spaced apertures through which are threaded an interrogate winding and a read-out winding. Pulses or alternating current on the interrogate winding induce output pulses in the read-out winding as long as the ferrite stick is not saturated. A control winding is wound about the ferrite stick and is adapted to be energized by a pair of telephone lines, for example when the receiver is taken off the hook switch. This current causes saturation of the ferrite stick so that flux switching cannot take place and no pulses are induced in the read-out winding. The ferrite stick and its windings are placed within a ferromagnetic pot core thereby gaining higher sensitivity for the same amount of current as compared to known sensors as well as shielding from external magnetic fields. The device is very compact and a screw in one end of the pot core allows for varying the sensitivity of the device.

    摘要翻译： 铁电传感器包括细长的铁氧体棒，其具有一对间隔开的孔，通过它们穿过询问绕组和读出绕组。 只要铁氧体棒不饱和，询问绕组上的脉冲或交流电就会引起读出绕组中的输出脉冲。 控制绕组缠绕在铁氧体棒周围，并且适于被一对电话线路激励，例如当接收器从挂钩开关脱下时。 该电流引起铁氧体棒的饱和，使得不能发生磁通切换，并且在读出绕组中不产生脉冲。 铁氧体棒及其绕组被放置在铁磁罐芯内，因此与已知的传感器以及与外部磁场的屏蔽相比，相同量的电流具有更高的灵敏度。 该装置非常紧凑，并且罐芯一端的螺钉允许改变装置的灵敏度。