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Long-distance power line communication module

A power line communication, long-distance technology, applied in distribution line transmission systems, electrical components, wired transmission systems, etc., to avoid crosstalk in the station area and improve reliability.

Inactive Publication Date: 2020-02-25
北京世纪德晋电力科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

No high-frequency carrier is used, so there is no problem of signal crosstalk

Method used

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  • Long-distance power line communication module
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0025] The module block diagram that the present invention implements is as figure 1 shown. The time reference (3) uses a zero-crossing detection module to detect the moment when the voltage between the neutral line and the live wire is zero, and the zero-crossing signal generated is used as a time reference. The control circuit (4) is realized by an MCU, and the controllable switch (6) is connected to input or disconnect the load (5); and control the working time of the receiving sampling (2) circuit.

[0026] Since the voltage cycle of the power line is a fixed value of 20ms, and each zero-crossing interval is 10ms, the MCU can accurately calculate the next zero-crossing time t0 according to the zero-crossing signal provided by the zero-crossing detection circuit, and can also calculate t0 before t0 time -tb and t0+ta after t0 are used to control the connection and disconnection of the load (5) by the switch (6).

[0027] When the MCU receives the zero-crossing signal when...

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PUM

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Abstract

The invention discloses a long-distance power line communication module. During sending, a time reference signal is provided through the time reference (3) circuit and sent to the control circuit (4),the control circuit (4) calculates the power frequency voltage zero crossing point time t0 and controls a switch (6) to connect a load (5) to a power line near the t0, so that the waveform trend of the power line voltage is changed, and data information is sent out. During receiving, data information can be demodulated by receiving and sampling the power line voltage waveform (2) and related decoding (1) is carried out on the power line voltage waveform and a normal waveform. Compared with an existing carrier communication module, the reliability of power line data transmission can be greatlyimproved, reliable point-to-point communication in a transformer district is achieved, communication does not need to be conducted in a relay mode, and the requirements for real-time communication and real-time control are met. Moreover, the method using the communication module does not cause crosstalk to the power lines of the adjacent transformer areas, and avoids the crosstalk problem of thetransformer areas.

Description

technical field [0001] The invention relates to the field of low-voltage power line communication, in particular to a module for long-distance data transmission using low-voltage power lines. Background technique [0002] To transmit data with power lines, high-frequency carrier is generally used. The carrier frequency of narrowband communication is 5KHz-500KHz, and the carrier frequency of broadband communication is 2MHz-30MHz. The higher the carrier frequency, the greater the attenuation of the signal on the power line, the closer the communication distance, and it is susceptible to noise interference on the power line. Especially in applications such as carrier meter reading and remote control, the existing narrowband and broadband carrier communication distances cannot cover the entire transformer station area, and communication needs to be done through relays, so it is difficult to achieve reliable real-time communication and control; and The carrier signals between di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B3/54
CPCH04B3/54H04B3/544
Inventor 不公告发明人
Owner 北京世纪德晋电力科技有限公司