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1.发明授权Power line carrier communication system having efficient carrier signal coupling of distribution secondary lines 失效电力线载波通信系统具有有效的载波信号耦合分配二线
公开(公告)号：US4008467A
公开(公告)日：1977-02-15
申请号：US613835
申请日：1975-09-16
CPC分类号： H04B3/54 , H04B2203/5458 , Y10T307/25 , Y10T307/258
摘要： An arrangement of components for a distribution line communication system. Two or more independent secondary distribution lines are connected, through distribution transformers, to a primary distribution line. Carrier communication signals are transferred between the primary distribution line and one of the secondary distribution lines by a repeater located near one of the transformers. The carrier communication signals are propagated directly along this secondary distribution line and through associated service lines to communications terminals located near the electrical loads. Coupling apparatus is connected between the two independent secondary distribution lines to provide a path for the communication signals between the repeater and the communications terminals associated with the other secondary distribution line. The coupling apparatus provides a low-impedance path for the communication signals and a high-impedance path for signals at conventional electrical power frequencies.
摘要翻译： 用于配电线路通信系统的组件的布置。 两个或多个独立的二次配电线路通过配电变压器连接到主配线。 载波通信信号通过位于一个变压器附近的中继器在主配线和其中一个辅配线之间传输。 载波通信信号沿着该二次配线直接传播，并通过相关的业务线传输到位于电负载附近的通信终端。 耦合装置连接在两个独立的次级配电线路之间，以提供中继器和与另一个二次配电线路相关联的通信终端之间的通信信号的路径。 耦合装置为通信信号提供低阻抗路径，并为常规电力频率的信号提供高阻抗路径。
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公开(公告)号：US4057754A
公开(公告)日：1977-11-08
申请号：US684059
申请日：1976-05-06
摘要： A transducer is utilized to convert the eccentricity of a turbine shaft into a sinusoidal electrical voltage signal having a given frequency, amplitude and a DC bias. This electrical signal is provided to a circuit which periodically measures the maximum and minimum peaks of the sinusoidal signal. The frequency at which the latter measurements occur is related to the frequency of the sinusoidal input signal. The maximum and minimum levels of magnitude are stored periodically as DC levels and subtracted from each other to determine the absolute value of eccentricity. In addition the stored minimum value is compared with the sinusoidal signal to reduce the DC bias of the sinusoidal signal to a point where the negative peaks thereof are at zero.
摘要翻译： 传感器用于将涡轮轴的偏心度转换成具有给定频率，振幅和DC偏压的正弦电压信号。 该电信号被提供给周期性地测量正弦信号的最大和最小峰值的电路。 后一次测量发生的频率与正弦输入信号的频率有关。 周期性地将最大和最小电平值作为DC电平存储并相互减去以确定偏心率的绝对值。 此外，将存储的最小值与正弦信号进行比较，以将正弦信号的DC偏压减小到其负峰值为零的点。
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公开(公告)号：US4039959A
公开(公告)日：1977-08-02
申请号：US600557
申请日：1975-07-31
IPC分类号： H04L27/156 , H03K9/06 , H03K13/24
CPC分类号： H04L27/1563
摘要： A decoder for converting a frequency coded digital input signal into a binary output signal. The decoder includes circuitry which detects when the input signal consists of the proper tones. When these tones are present, the decoder circuitry converts the tone signals into constant amplitude squarewave signals. The squarewave signals are then attenuated and integrated, and these two signals are offset and applied to a comparator. The resulting signal from the comparator is in the form of a pulse signal having rectangular pulses of constant amplitude and width, with the repetition rate of the pulses being equal to the corresponding tone frequency. The rectangular pulse signal is filtered and converted into a binary signal having binary levels which correspond to the average value of the filtered pulse signal with respect to an adjustable reference value. The noise response of the decoder is dependent upon the energy in a noise signal rather than just the amplitude, thus the decoder is highly immune to false decoding due to short noise pulses.
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公开(公告)号：US3962547A
公开(公告)日：1976-06-08
申请号：US580861
申请日：1975-05-27
CPC分类号： H04B3/58
摘要： Apparatus for connecting separate transmitters of a carrier communication system to the same location on a power distribution line. A low-power transmitter is connected to the primary winding of an interconnecting transformer. The secondary winding of the interconnecting transformer is connected between a high-power transmitter and, through the primary winding of a coupling transformer, to ground potential. The secondary winding of the coupling transformer is coupled to the power distribution line. A voltage limiting device is connected across the secondary winding of the interconnecting transformer. The output of the high-power transmitter is directed across the voltage limiting device to the coupling transformer where it is applied to the distribution line. When the low-power transmitter is turned on and the drive signal to the high-power transmitter is turned off, the power from the low-power transmitter is transferred to the secondary winding of the interconnecting transformer and to the coupling transformer where it is applied to the distribution line. The high-power transmitter represents a virtual ground potential when it is not transmitting, thereby providing a closed circuit path for the power delivered by the low-power transmitter.
摘要翻译： 用于将载波通信系统的单独发射机连接到配电线路上的相同位置的装置。 低功率发射器连接到互连变压器的初级绕组。 互连变压器的次级绕组连接在大功率发射器之间，并通过耦合变压器的初级绕组连接到地电位。 耦合变压器的次级绕组耦合到配电线路。 电压限制装置连接在互连变压器的次级绕组两端。 大功率发射机的输出端通过电压限制装置被引导到耦合变压器，在耦合变压器上施加到配电线路。 当低功率发射机接通并且高功率发射机的驱动信号被关闭时，来自低功率发射机的功率被传送到互连变压器的次级绕组和被耦合的耦合变压器 到配送线。 高功率发射机在不发射时表示虚拟地电位，从而为由低功率发射机提供的功率提供闭路电路。
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