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Power line carrier communication transmitting circuit

A technology of power line carrier and transmission circuit, applied in the field of power line carrier communication and communication, which can solve the problems of large impedance variation range, high input impedance, and inability to power line carrier communication.

Inactive Publication Date: 2013-08-14
IOTCOMM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the power line is not a line specially erected for communication purposes, it is mainly laid for the purpose of power transmission. The interference of various electrical equipment on the line is very serious, and the load changes greatly, so the impedance changes in a large range. The current transmission circuit cannot Effectively prevent interference from other frequency bands, and there is no low output impedance and high input impedance, so it cannot be effectively used for power line carrier communication

Method used

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  • Power line carrier communication transmitting circuit
  • Power line carrier communication transmitting circuit
  • Power line carrier communication transmitting circuit

Examples

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Embodiment 1

[0025] Example 1 as figure 1 As shown, this embodiment is a transmission circuit of a power line carrier communication device. After the modulated carrier signal is filtered in the transmission circuit, it is amplified by a power amplifier, and then coupled to the power line through a coupling circuit for transmission.

[0026] Such as image 3 Shown is the filter circuit of this embodiment, the carrier signal is low-pass filtered through this filter circuit, the filter circuit of this embodiment is a third-order band-pass filter, the carrier signal passes through the three-stage filter successively, and the third-order band-pass filter It includes a first-order filter composed of a filter inductor L4 and a filter capacitor C11 connected in parallel in the signal transmission direction, and a second-order filter composed of a filter capacitor C8 and a filter capacitor L2 connected in series after the first-order filter. After the second-order filter, the third-order filter is...

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PUM

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Abstract

The invention provides a power line carrier communication transmitting circuit comprising a filter circuit, a power amplification circuit and a coupling circuit; the modulation signal is filtered by the filter circuit and subsequently enters the power amplification circuit so as to be amplified; the amplified modulation signal enters the power line channel by the coupling circuit and is transmitted. The power line carrier communication transmitting circuit provides signal filtering of communication frequency band and stops the interference of other frequency bands; and the power amplifier haslow output resistance and high input resistance so as to be effectively used for power line carrier communication.

Description

Technical field [0001] The invention relates to the field of communication, in particular to the field of power line carrier communication, and relates to a sending circuit of power line carrier communication. Background technique [0002] Power line carrier communication is a communication method that transmits information through high-voltage power lines with high-frequency carrier signals. The communication system uses the transmission line as the transmission medium of the carrier signal for power system communication. Since the power transmission line has a very strong support structure and more than 3 conductors (generally there are three-phase good conductors and one or two overhead ground wires), it is economical to use the power frequency current to transmit the carrier signal at the same time as the transmission line And very reliable. This kind of comprehensive utilization has already become the unique communication means adopted by all electric power department...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B3/54
Inventor 查利君宋宏伟
Owner IOTCOMM TECH