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    • 1. 发明授权
    • Intrinsically safe barrier device
    • 本质安全屏障装置
    • US5144517A
    • 1992-09-01
    • US746047
    • 1991-08-12
    • Hermann Wieth
    • Hermann Wieth
    • H02H3/02H02H9/00H02H9/02H02H11/00
    • H02H9/008H02H11/002H02H3/023H02H9/026
    • An protection barrier provides voltage and current necessarily conveyed to hazardous, such as explosive, areas. The system includes a current sensing circuit which triggers a silicon control rectifier based crowbar circuit in the event over current is detected. This triggering, in turn, trips a relay severing the current path entirely. A reverse polarity circuit provides for immediate clamping of improperly bias connections in a similar crowbar arrangement, and also provides for tripping of the circuit breaker. Thermistors are also provided in current series in the event the circuit breaker fails to trip, or is forcibly bypassed. The circuit breaker additional provides a visual indicator when it is in the tripped position. The intrinsic barrier system is suitable to serving as a first stage protection to zener barrier modules as utilized in the prior art.
    • 保护屏障提供电压和电流必然传达到危险的,例如爆炸性的区域。 该系统包括电流感测电路,在检测到过电流的情况下触发基于硅控制整流器的撬棒电路。 这个触发反过来又跳过了一个完全切断当前路径的继电器。 反向极性电路提供在类似的撬棒布置中立即钳位不正确的偏置连接,并且还提供断路器的跳闸。 如果断路器不能跳闸或被强制旁路,热敏电阻也以当前系列提供。 附加断路器在处于跳闸位置时提供视觉指示器。 本征屏障系统适用于作为现有技术中使用的齐纳屏障模块的第一级保护。
    • 7. 发明授权
    • Control-safe capacitive switch
    • 控制安全电容开关
    • US5233231A
    • 1993-08-03
    • US800219
    • 1991-11-29
    • Hermann WiethHans-Jurgen Schiefer
    • Hermann WiethHans-Jurgen Schiefer
    • F16P3/00F16P3/20H03K17/96
    • F16P3/003F16P3/20H03K17/962Y10T307/766
    • A palm-button control system provides for machinery control with minimized operator hand pressure by use of capacitive switches and reduced susceptibility to radio frequency interference. The system employs first and second capacitive palm-button switches, both of which must be contacted before machinery is activated. Each capacitive palm-button includes a radio frequency sensor which functions to disable machine activation in the presence of a sufficiently strong radio signal. Circuitry for periodically testing the radio frequency sensors provides periodic visual operator feedback indicative of operability of the system. All controls are synchronized or enabled in accordance with a series of digital pulses.
    • 手掌按钮控制系统通过使用电容开关提供最小化操作手压力的机械控制,降低对射频干扰的敏感性。 该系统采用第一和第二电容式掌按钮开关,在机械启动之前,两者必须接触。 每个电容手掌按钮包括射频传感器,其功能是在存在足够强的无线电信号的情况下禁用机器激活。 定期测试射频传感器的电路提供了指示系统可操作性的周期性视觉操作员反馈。 所有的控制按照一系列的数字脉冲进行同步或启用。