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    • 10. 发明申请
    • PROCESS TRANSMITTER COMMUNICATIONS CIRCUIT
    • 过程发送器通信电路
    • WO1998014854A1
    • 1998-04-09
    • PCT/US1997017611
    • 1997-09-30
    • ROSEMOUNT INC.
    • ROSEMOUNT INC.LONGSDORF, Randy, J.EDWARDS, Grant, B.NELSON, Richard, L.PEDERSON, David, L.
    • G05B19/42
    • G05B19/4185Y02P90/18
    • A process transmitter communications circuit (20, 96) has link terminals (40) which are coupled to a process link (12), which supplies power to the circuit. A power source (38) is coupled to one of the link terminals and is independent from the power supplied from the process link (12). Communications circuitry (42) is coupled to the power source (38) and link terminals (40), which transmits a transmitter signal over the process link (12), through the link terminals (40). A power sensing component (44) is coupled to at least one of the link terminals (40) and the communications circuitry (42) and senses whether the power supplied by the process link (12) is inadequate to transmit the transmitter signal. A power control component (46) is coupled to the power source (38), the link terminals (40) and the communications circuitry (42) and selectively applies power from the power source (38) to the communications circuitry (42) for transmitting the transmitter signal when the power sensing component (44) senses there is inadequate power supplied by the process link (12).
    • 过程变送器通信电路(20,96)具有连接端子(40),该连接端子(40)耦合到处理链路(12),该处理链路为电路供电。 电源(38)耦合到一个链路终端,并且独立于从处理链路(12)提供的电力。 通信电路(42)耦合到通过链路终端(40)通过过程链路(12)发送发射机信号的电源(38)和链路终端(40)。 功率感测组件(44)耦合到链路终端(40)和通信电路(42)中的至少一个,并且感测由过程链路(12)提供的功率是否不足以发送发射机信号。 功率控制部件(46)耦合到电源(38),链路端子(40)和通信电路(42),并且选择性地将来自电源(38)的功率施加到通信电路(42)以用于发射 当功率感测组件(44)感测到由处理链路(12)提供的功率不足时,发射机信号。