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    Circuit for driving a relay used in an AC circuit, with a protection against contact welding
    1.
    发明授权
    Circuit for driving a relay used in an AC circuit, with a protection against contact welding 失效
    用于驱动用于交流电路的继电器的电路，具有防止接触焊接的保护

    公开(公告)号：US4769737A

    公开(公告)日：1988-09-06

    申请号：US62603

    申请日：1987-06-16

    申请人： Yasuhiro Ogita ,  Tamotu Maegawa

    发明人： Yasuhiro Ogita ,  Tamotu Maegawa

    IPC分类号： H01H47/00 ,  H01H9/56 ,  H01H47/22 ,  H01H47/12

    CPC分类号： H01H9/56 ,  H01H47/002 ,  Y10T307/924

    摘要： A circuit for driving a relay having at least two contacts and an excitation coil. An AC power source is connected to the contacts of the relay for applying a voltage of a prescribed frequency to these contacts. A detector section compares a pulse current, induced in phase with the AC current supplied from the AC power source, with a reference value, thereby producing a detection signal. In accordance with this detection signal, the positive and negative phases of a signal having a cycle longer than, and being asychronous with, said AC current, are delayed alternately or at random, thereby generating a timing control signal. This timing control signal closes and opens said relay at random timings, thereby protecting the relay from contact welding.

    摘要翻译： 一种用于驱动具有至少两个触点和励磁线圈的继电器的电路。 AC电源连接到继电器的触点，以向这些触点施加规定频率的电压。 检测器部分将从AC电源提供的AC电流的同相感应脉冲电流与参考值进行比较，从而产生检测信号。 根据该检测信号，具有比所述AC电流长的周期并且与所述AC电流不同步的信号的正相和负相位被交替地或随机地延迟，从而产生定时控制信号。 该定时控制信号以随机定时关闭并打开所述继电器，从而保护继电器免受接触焊接。

    Fire-suppressing foam level controller
    3.
    发明授权
    Fire-suppressing foam level controller 失效
    防火泡沫液位控制器

    公开(公告)号：US4169278A

    公开(公告)日：1979-09-25

    申请号：US883368

    申请日：1978-03-06

    申请人： Ferdinand Roehlich ,  Robert L. Rankin

    发明人： Ferdinand Roehlich ,  Robert L. Rankin

    IPC分类号： H01H47/12

    CPC分类号： H01H47/12 ,  Y10T137/7306

    摘要： An electric circuit for energizing a fire-suppressing foam generator includes a switch that is opened and closed by means operated by electric control circuits, one of which contains a pair of laterally spaced lower electric probe contacts mounted in the protected area and adapted to be bridged by a rising level of foam to close that circuit. The other control circuit contains a pair of laterally spaced upper electric probe contacts above the level of the lower contacts and adapted to be bridged by a rising level of foam to close the last-mentioned control circuit.

    摘要翻译： 用于激发消泡泡沫发生器的电路包括通过电控电路操作的开关闭合的开关，其中一个电路包含安装在保护区域中并适于桥接的一对侧向间隔开的下电探头触点 通过上升的泡沫水平关闭该电路。 另一个控制电路包含一对横向隔开的上部电探头触点，位于下部触点的电平之上，并且适于由升高的泡沫水平桥接以闭合最后提到的控制电路。

    Electronic protection and sensing apparatus
    4.
    发明授权
    Electronic protection and sensing apparatus 失效
    电子保护和感应装置

    公开(公告)号：US3836828A

    公开(公告)日：1974-09-17

    申请号：US37078373

    申请日：1973-06-18

    申请人： WELDOTRON CORP

    发明人： SIEGEL L

    IPC分类号： G01V3/08 ,  G08B13/26 ,  H03K17/955 ,  H01H47/12

    CPC分类号： G08B13/26 ,  H03K17/955 ,  H03K2217/96075

    摘要： The apparatus comprises an electronic system including an antenna positioned about the equipment to be protected and coupled to a resistor-capacitor bridge, to which is coupled an oscillator. The output of the bridge is coupled through a differential amplifier to a demodulator, and the output of the oscillator is also coupled directly to the demodulator, The demodulator output is coupled through an amplifying system both to a display device, which is used to indicate the state of balance of the system, and to a control circuit for generating a signal which is coupled to the equipment to be protected to turn it off or to otherwise exert a protective control action when a certain level of unbalance in the bridge occurs.

    摘要翻译： 该装置包括电子系统，其包括围绕要保护的设备定位并耦合到电阻 - 电容器桥的天线，耦合到振荡器。 桥的输出通过差分放大器耦合到解调器，并且振荡器的输出也直接耦合到解调器。解调器输出通过放大系统耦合到显示装置，显示装置用于指示 系统的平衡状态，以及用于产生耦合到要被保护的设备的信号的控制电路，以在桥中发生一定程度的不平衡的情况下将其关闭或者施加保护性控制动作。