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1. 发明授权

US5245333A Three wire low power transmitter 失效
标题翻译：三线低功率发射机
公开(公告)号：US5245333A
公开(公告)日：1993-09-14
申请号：US766667
申请日：1991-09-25
申请人： Stephen D. Anderson , Roger L. Frick , Glen E. Monzo , Brian L. Westfield
发明人： Stephen D. Anderson , Roger L. Frick , Glen E. Monzo , Brian L. Westfield
IPC分类号： G08C19/02
CPC分类号： G08C19/02
摘要： A three wire transmitter bidirectionally communicates AC signals to and from a first external device and sends DC signals to a second external device. The transmitter includes a communication circuit which is energized from power and common terminals and includes memory storage for transmitter status and a process variable (PV). The communication circuit receives a sensor output indicative of the PV and provides the DC signal and the AC signal to a signal terminal which connects to both external devices, and also receives AC signals from the first external device. The communications circuit has a characteristic AC impedance between the signal and common terminals over an AC frequency range for receiving and transmitting AC signals to and from the first external device so that the receiving signals are not shorted out and so the transmitted signals can be received. The communications circuit has a characteristic DC impedance between the signal and common terminals over a range of frequencies which include DC and typically extend to approximately 20 Hz. The characteristic impedance is substantially lower than the impedance of the second external device which receives DC signals so that the accuracy of the DC signal is not compromised.
摘要翻译：三线制发射机将交流信号双向地传送到第一外部设备并从第一外部设备传送直流信号到第二外部设备。发射机包括一个从电源和公共终端通电的通信电路，包括用于发射机状态的存储器和一个过程变量（PV）。通信电路接收表示PV的传感器输出，并将DC信号和AC信号提供给连接到两个外部设备的信号端子，并且还从第一外部设备接收AC信号。该通信电路具有在交流频率范围内的信号与公共端之间的特征交流阻抗，用于从第一外部装置接收和发送交流信号，使得接收信号不被短路，因此可以接收所发送的信号。通信电路在包括DC并且通常延伸到大约20Hz的频率范围内在信号和公共端子之间具有特征的DC阻抗。特征阻抗基本上低于接收DC信号的第二外部设备的阻抗，使得DC信号的精度不受影响。

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