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    • 6. 发明申请
    • Current Loop Input Protection
    • 电流环路输入保护
    • US20160254663A1
    • 2016-09-01
    • US15148544
    • 2016-05-06
    • FISHER CONTROLS INTERNATIONAL LLC
    • Clyde T. Eisenbeis
    • H02H9/04
    • A component in a process control device such as a valve actuator, for example, is coupled to a protective circuit. In particular, the protective circuit allows an analog current loop (e.g., 4-20 mA) to provide to the component a secondary operating voltage, derived from the analog current loop, in the absence of a primary operating voltage source (e.g., during a power failure), such that the component is not damaged when a signal from the analog current loop is applied to the process control device in the absence of the primary operating voltage source.
    • 诸如阀致动器的过程控制装置中的部件例如被耦合到保护电路。 特别地,保护电路允许模拟电流回路(例如,4-20mA)在不存在初级工作电压源(例如,在一段时间内)期间向该部件提供从模拟电流回路导出的次级工作电压 电源故障),使得当在没有主要工作电压源的情况下将来自模拟电流回路的信号施加到过程控制装置时,该部件不被损坏。