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    • 3. 发明申请
    • COUPLING OF TELECOMMUNICATIONS SIGNALS TO A BALANCED POWER DISTRIBUTION NETWORK
    • 电信信号耦合到平衡电力分配网络
    • WO1996007245A1
    • 1996-03-07
    • PCT/GB1995002023
    • 1995-08-25
    • NORWEB PLCBROWN, Paul, Anthony
    • NORWEB PLC
    • H04B03/56
    • H04B3/56H04B2203/5491
    • The present invention provides an overhead balanced electricity distribution and/or power transmission network (1201), the network including input means (1301) for the input onto the network of a telecommunications signal having a carrier frequency greater than approximately 1MHz from an unbalanced source and output means (1301) for removing said telecommunications signal from the network, wherein said input means and said output means provide impedance matching between said network and said source. Thus, propagation of HF communication signals over such networks is optimised, and the input and output means ("conditioning units") provide for interconnection between a source e.g. a relatively low impedance unbalanced HF (possibly coaxial) termination and a high impedance balanced OH EDN, and provide efficient unbalanced to balanced impedance transformation and termination.
    • 本发明提供了一种架空平衡配电和/或电力传输网络(1201),该网络包括输入装置(1301),用于输入到具有来自不平衡源的载波频率大于约1MHz的电信信号的电信信号,以及 用于从所述网络去除所述电信信号的输出装置(1301),其中所述输入装置和所述输出装置提供所述网络和所述源之间的阻抗匹配。 因此,HF通信信号在这种网络上的传播被优化,并且输入和输出装置(“调节单元”)提供源之间的互连。 阻抗不平衡HF(可能是同轴)端接和高阻抗平衡OH EDN,并提供有效的不平衡平衡阻抗变换和终止。
    • 5. 发明公开
    • Power supply line carrier communication systems
    • 电源线载波通信系统
    • EP0124260A3
    • 1985-05-15
    • EP84302117
    • 1984-03-28
    • THE GENERAL ELECTRIC COMPANY, p.l.c.
    • Jones, Alan JohnLamont, Iain Andrew james
    • H04B03/56
    • H04B3/56H04B2203/5425H04B2203/5433H04B2203/5458H04B2203/5483
    • A transmitter/receiver unit for use in a two way electrical power supply line carrier communication system. The unit includes two conductors (3, 5) for connection to the supply line, and a transmitter (1) and a receiver (7) each connected across the two conductors. A first winding (9) of a transformer is connected in series between the transmitter (1) and receiver (7) on one of the conductors (3). Switching means (13, 15, 21) is provided which is operable to control the impedance across a second winding (11) of the transformer so that the first winding (9) presents a relatively high impedance to carrier signals when the receiver (7) is operating, and a relatively low impedance to carrier signals when the transmitter is operating.
    • 用于双向电力供电线路载波通信系统的发射机/接收机单元。 该单元包括用于连接到电源线的两个导体(3,5)和分别连接在两个导体上的发射器(1)和接收器(7)。 变压器的第一绕组(9)串联在一个导体(3)上的发射器(1)和接收器(7)之间。 提供了开关装置(13,15,21),其可操作以控制跨越变压器的第二绕组(11)的阻抗,使得当接收器(7)处于接收器(7)时,第一绕组(9)对载波信号呈现相对较高的阻抗, 在发射机运行时,对载波信号的阻抗相对较低。
    • 8. 发明公开
    • Transceiver for multi-drop local area networks
    • 多台本地区网络的收发器
    • EP0156557A3
    • 1987-07-15
    • EP85301557
    • 1985-03-06
    • CONTROLONICS CORPORATION
    • Hill, Lawrence WoodbridgeSarles, Frederick Williams
    • H04B03/56H04L11/16
    • H04L12/403H04B3/56H04B2203/5408H04B2203/5416H04B2203/5425H04B2203/5445H04B2203/5483H04B2203/5491H04B2203/5495H04L12/40
    • A multi-drop local area network utilizes alternating current power lines as a transmission channel. Identical transceivers are used as a master and as up to 255 slaves. Each transceiver comprises modulator and demodulator units and a microprocessor control unit which may be connected to a host. The modulator and demodulator are connected to the alternating current power line through a high pass filter comprising a split bobbin, iron core transformer having an air gap which also provides impedance matching. The demodulator includes a clipper and analog circuitry providing a band pass filter and generating a square wave corresponding to the received carrier. A state machine acting as a digital filter produces a received carrier signal only when each half cycle of the carrier square wave is of the proper duration and the carrier signal has existed for slightly more than one half of the transmitted bit duration, which is a predetermined number of carrier cycles. The microprocessors are programmed to provide for block ahead acknowledgment, alternate transmissions between master and slaves; each block message comprises an acknowledgment non-acknowledgment bit, a message sequence bit, a polling sequence bit, and a longitudinal redundancy check. The carrier frequency utilized lies in the range of 20 to 40 KHz and preferably within the range between 27 and 33 KHz for a power line transmission channel. Error free 1200 Baud transmission rates are achieved in full duplex. Higher carrier frequencies and transmission rates are possible over less noisy transmission channefs such as wire pairs.