Power line carrier communication method and output coupling filter circuit
A technology of power line carrier and output coupling, applied in the direction of distribution line transmission system, etc., can solve the problems of high cost, complex system, complex preparation process, etc., and achieve the effects of low output impedance, reduced complexity, and reduced cost
Active Publication Date: 2020-04-24
上海盐巴信息科技有限公司
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Problems solved by technology
[0007] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a power line carrier communication method and an output coupling filter circuit, which are used to solve the system complexity caused by the use of three winding isolation transformers and field effect transistors in the prior art, The preparation process is complex and the cost is high
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[0049] Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention.
[0050] see Figure 3 ~ Figure 5 . It should be noted that the diagrams provided in this embodiment are only schematically illustrating the basic idea of the present invention, and only the components related to the present invention are shown in the diagrams rather than the number, shape and shape of the components in actual implementation. Dimensional drawing, the type, quantity and proportion of each component can be changed arbi...
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The invention provides a power line carrier communication method and an output coupling filter circuit. The output coupling filter circuit comprises first to third drivers, series and parallel resonant loops, and an isolation transformer. A first winding of the isolation transformer is connected with the first driver through the series resonant loop, and the other end is connected with the third driver. One end of the parallel resonant loop is connected between the series resonant loop and the first winding, and the other end is connected with the second driver. A second winding of the isolation transformer is connected with a power line. For sending, the first driver inputs a positive-phase carrier signal, the second and third drivers input negative-phase carrier signals, and the carrier signals are filtered and then coupled to the power line. For receiving, the first driver is connected with DC signals, the second and third drivers are in a high-resistance state, and the signals on the power line are read out from the first winding. The circuit has low output impedance in a sending state and high input impedance in a receiving state. The use of a three-winding isolation transformer and a field effect transistor is avoided, and the complexity and cost are reduced greatly.
Description
technical field [0001] The invention relates to the field of power line carrier communication, in particular to a power line carrier communication method and an output coupling filter circuit. Background technique [0002] Power line communication (PLC, Power line Communication) refers to the technology of using the existing power line to transmit analog or digital signals at high speed through the carrier mode. It is mainly used for dispatching communication, telecontrol, protection, production command and administrative business of the power system. Communication and various information transmission. The power line is designed for the transmission of 50Hz strong electricity. The line attenuation is small, the mechanical strength is high, and the transmission is reliable. The infrastructure investment and daily maintenance costs of communication line construction occupy an important position in the power system. [0003] In order to effectively carry out reliable data tra...
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IPC IPC(8): H04B3/54
CPCH04B3/54
Inventor 宋朝盛
Owner 上海盐巴信息科技有限公司