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    • 2. 发明授权
    • Two-wire signal transmitter and method for maintaining integrity of
electrical contacts
    • 双线信号发射器和保持电触点完整性的方法
    • US6052050A
    • 2000-04-18
    • US023902
    • 1998-02-13
    • Michael E. ColbaughBenjamin A. GiovannelliDick J. Kolkman
    • Michael E. ColbaughBenjamin A. GiovannelliDick J. Kolkman
    • H04L12/10H04L25/45H04M11/04
    • H04L12/10H04L25/45
    • Two-wire signal transmitter and method in which a very low-level Alternating Circuit (AC) input signal sensed at a remote circuit at a first end of a signal path is added to a low-level Direct Current (DC) bias signal provided by a local circuit that is located at a second end of the signal path. In a preferred embodiment, the remote circuit is electrically coupled to and powered by the local circuit through a two-wire path interconnection, typically a shielded twisted-pair cable. The DC bias signal has sufficient level to overcome minimum ratings of electrical contacts, thereby to pass the sensed very low-level AC input signal reliably through the poor electrical contacts that are used, for instance, for connecting electronic circuits that run the length of a railway train. In a preferred embodiment, the use of a unity gain current amplifier as a part of the remote circuit reduces the signal degrading effects of long signal paths, but does not amplify the AC input signal, thereby retaining known pre-determined railroad vitality requirements. An output signal is provided that is an AC coupled, isolated, non-amplified representation of the AC input signal. An alternate preferred embodiment utilizes no active amplifier as a part of the remote circuit, thereby providing a signal transmitter and method that is less complex, has lower cost, requires smaller packaging, and has somewhat better long-term reliability than the preferred embodiment utilizing the active amplifier in the remote circuit.
    • 双线信号发射机和方法,其中在信号路径的第一端处的远程电路处感测到的极低电平的交流电路(AC)输入信号被加到低电平直流(DC)偏置信号,该信号由 位于信号路径的第二端的本地电路。 在优选实施例中,远程电路通过双线路径互连(通常为屏蔽双绞线)电耦合到本地电路并由本地电路供电。 DC偏置信号具有足够的电平以克服电触点的最小额定值,从而将感测到的非常低级别的AC输入信号可靠地传递通过用于例如用于连接长度为 铁路列车 在优选实施例中,使用单位增益电流放大器作为远程电路的一部分来减少长信号路径的信号降级效应,但不会放大AC输入信号,从而保持已知的预定铁路活力​​要求。 提供输出信号,其是AC输入信号的AC耦合的,隔离的,非放大的表示。 替代的优选实施例不使用有源放大器作为远程电路的一部分,从而提供信号发射器和方法,其较不复杂,具有较低的成本,需要较小的封装,并且具有比使用 主动放大器在远程电路中。