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    • 95. 发明公开
    • FACILITIES EQUIPMENT COMMUNICATION CIRCUIT
    • EINRICHTUNGSGERÄTE-KOMMUNIKATIONSSCHALTUNG
    • EP1681776A1
    • 2006-07-19
    • EP04792643.1
    • 2004-10-20
    • MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
    • DOYAMA, Yoshiaki, Matsushita Elect.Ind. Co.Ltd.TAKEDA, Yoshihiko , Matsushita Elect.Ind. Co.Ltd.
    • H04B3/02H02H11/00
    • H04B3/542H04B2203/547
    • A communication circuit enables protection against improper wiring and high speed data communication over long wiring distances using only three wires including the power supply lines. The communication circuit uses one of the two AC power supply lines for the common channel. On the parent station side a first constant current source and transmission photocoupler, a reception photocoupler, and a constant voltage diode are connected in series between the positive and negative reference side of the power source. On each child station, a circuit connecting a second constant current source and reception photocoupler in series with the reference line through a relay is parallel connected to a photocoupler disposed for shorting the relay output and reference line, and the relay goes on after the potential difference between the communication bus and the reference line goes below a specified level.
    • 通信电路通过仅使用包括电源线在内的三根电线,可以在长距离的布线距离上实现不正确的布线和高速数据通信。 通信电路使用两个交流电源线中的一个用于公共通道。 在母站侧,第一恒流源和透射光电耦合器,接收光电耦合器和恒压二极管串联连接在电源的正参考侧和负参考侧之间。 在每个子站上,通过继电器与参考线串联连接第二恒流源和接收光电耦合器的电路并联连接到用于短路继电器输出和参考线的光电耦合器,并且继电器在电位差 通信总线和参考线之间的电平低于指定电平。