CN112910505A - Noise elimination circuit applied to medium-voltage power line communication equipment - Google Patents
Noise elimination circuit applied to medium-voltage power line communication equipment Download PDFInfo
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- CN112910505A CN112910505A CN202110171305.9A CN202110171305A CN112910505A CN 112910505 A CN112910505 A CN 112910505A CN 202110171305 A CN202110171305 A CN 202110171305A CN 112910505 A CN112910505 A CN 112910505A
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- communication equipment
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
- H04B3/542—Systems for transmission via power distribution lines the information being in digital form
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B15/00—Suppression or limitation of noise or interference
- H04B15/005—Reducing noise, e.g. humm, from the supply
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- Computer Networks & Wireless Communication (AREA)
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- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
The invention discloses a noise elimination circuit applied to medium-voltage power line communication equipment, which comprises an equipment MCU circuit, a noise acquisition circuit, a noise analysis circuit, a noise transmitting circuit and a noise receiving circuit, wherein the equipment MCU circuit is connected with the noise acquisition circuit and the noise analysis circuit, and the noise acquisition circuit is connected with the noise analysis circuit, the noise transmitting circuit and the noise receiving circuit. The invention realizes the collection, analysis and processing of noise in the communication equipment by a simple structure, generates the inverse noise to offset the actual noise, realizes the effective filtering of noise signals, improves the signal quality, has high stability and low cost, and is easy to popularize. Meanwhile, the invention is not limited by the working frequency range of the medium-voltage power line communication equipment, can process the noise signals beyond the input range of the noise elimination circuit and has strong compatibility.
Description
Technical Field
The invention relates to the technical field of medium-voltage power line communication, in particular to a noise elimination circuit applied to medium-voltage power line communication equipment.
Background
Medium voltage power line noise is generated by the action of various power equipment connected to the power grid, power system operation, wireless signals, certain natural phenomena and other factors.
After the noise on the medium voltage power line is coupled and input to the medium voltage power line communication equipment, the diversity of the noise source can cause the time irregularity and the wide spectrum distribution of the noise, so that the communication equipment working at different frequency bands can be interfered by different degrees, and the receiving and the demodulation of the effective signals by the equipment are influenced.
Disclosure of Invention
Aiming at the defects or shortcomings in the prior art, the invention provides the noise elimination circuit applied to the medium-voltage power line communication equipment, which realizes the collection, analysis and processing of noise in the communication equipment by a simple structure, generates reverse phase noise to offset the actual noise and realizes the effective filtering of noise signals.
The purpose of the invention can be realized by the following technical scheme:
a noise elimination circuit applied to medium-voltage power line communication equipment comprises an equipment MCU circuit, a noise acquisition circuit, a noise analysis circuit, a noise sending circuit and a noise receiving circuit;
the connection relationship among the modules is as follows: the equipment MCU circuit is connected with the noise acquisition circuit and the noise analysis circuit, and the noise acquisition circuit is connected with the noise analysis circuit, the noise transmitting circuit and the noise receiving circuit.
Furthermore, the equipment MCU circuit controls the noise acquisition circuit to acquire line noise in an automatic gain control mode when the medium voltage power line communication equipment accessed to the power grid is in a non-working state, and stops noise acquisition when the communication equipment is in a working state; after finishing an acquisition period, the MCU circuit controls the noise transmitting circuit to continuously output noise.
Furthermore, when the noise acquisition circuit acquires noise, the noise higher than the upper limit of the input of the noise acquisition circuit is acquired in a voltage reduction mode, and the noise lower than the lower limit of the input of the noise acquisition circuit is acquired in an amplification mode.
Furthermore, after the noise acquisition circuit acquires the noise, the noise analysis circuit analyzes the frequency spectrum, the phase and the amplitude of the noise at different time and different frequency bands, and then processes the noise to obtain a noise signal with the phase opposite to that of the line noise signal and the amplitude equal to that of the line noise signal, and stores the noise signal.
Furthermore, the noise sending circuit amplifies the noise signal which is obtained after the processing of the noise analysis circuit and has the phase opposite to that of the line noise signal and the same amplitude, and sends the amplified noise signal to the noise receiving circuit.
Furthermore, the noise receiving circuit receives an effective signal which is coupled to the communication equipment by the power grid, and simultaneously receives a noise signal which is opposite in phase and equal in amplitude to the line noise signal and is sent by the noise sending circuit, and the noise signal is cancelled with an actual line noise signal, so that the purpose of noise reduction is achieved.
The invention has the beneficial effects that: the noise collection, analysis and processing are realized in the communication equipment by a simple structure, the reverse phase noise is generated to offset the actual noise, the effective filtering of noise signals is realized, the signal quality is improved, the stability is high, the cost is low, and the popularization is easy. Meanwhile, the invention is not limited by the working frequency range of the medium-voltage power line communication equipment, can process the noise signals beyond the input range of the noise elimination circuit and has strong compatibility.
Drawings
Fig. 1 is a schematic diagram of the present invention.
Detailed Description
The present invention will be further described with reference to fig. 1 and the embodiments, so as to specifically describe the system scheme of the present invention. The following examples are only for illustrating the scheme of the present invention more clearly, and are not intended to limit the scope of the present invention.
As shown in fig. 1, a noise canceling circuit applied to a medium voltage power line communication apparatus includes:
the device MCU circuit controls the noise acquisition circuit to acquire line noise in an automatic gain control mode when the medium-voltage power line communication device accessed to the power grid is in a non-working state, and stops noise acquisition when the communication device is in a working state; after finishing an acquisition period, the MCU circuit controls the noise transmitting circuit to continuously output noise;
and the equipment MCU circuit controls the noise acquisition circuit to acquire noise in an AGC (automatic gain control) mode when the equipment is confirmed to be in a non-working state. When the equipment works, the MCU circuit controls the noise acquisition circuit to stop noise acquisition. And after multiple times of acquisition at different times, noise acquisition in the whole day period is completed. And the device MCU circuit stores the AGC gain control signal and outputs the AGC gain control signal to the noise analysis circuit to restore the noise. Because the power line noise also has difference at the same time, the MCU circuit can continuously control the noise acquisition circuit to acquire noise;
the noise collection circuit is composed of an AGC amplifying circuit and an A/D sampling circuit. When the communication device is in a non-operational state, power line noise may be coupled to the noise collection circuit. When the noise signal is too large, the AGC circuit attenuates the noise signal; when the noise signal is too small, the AGC circuit gains the noise signal, the AGC control signal is output to the MCU circuit, the noise signal is output to the A/D sampling circuit for analog-to-digital conversion, and the converted digital signal is output to the noise analysis circuit;
the noise analysis circuit analyzes the received digital noise signal to analyze the frequency spectrum, the amplitude and the phase of the digital noise signal, reduces the power line noise in proportion according to an AGC control signal provided by the MCU circuit and performs inverse processing on the power line noise;
the noise sending circuit is composed of a D/A conversion circuit and an AGC amplification circuit, wherein the D/A carries out digital-to-analog conversion on the received noise signal, and the noise signal is amplified to the original noise amplitude value in proportion by the amplification circuit. When the equipment is in a working state, outputting the amplified signal to a noise receiving circuit;
and when the equipment is in a working state, the noise receiving circuit receives a mixed signal of the effective signal and the line noise and also receives a noise signal input by the noise transmitting circuit, and noises with opposite phases are mutually counteracted to restore a real effective signal.
The equipment MCU circuit is connected with the noise acquisition circuit and the noise analysis circuit, and the noise acquisition circuit is connected with the noise analysis circuit, the noise transmitting circuit and the noise receiving circuit.
The invention fully utilizes the non-working state of the medium-voltage communication equipment to continuously collect the line noise, and does not occupy the normal working time of the communication equipment. After long-time noise collection is carried out by the collection circuit, the analysis circuit carries out comprehensive analysis on the line noise, effectively simulates the line noise, carries out reverse phase processing on a noise signal, feeds the noise signal into the receiving circuit through the sending circuit, and couples the noise signal with actual noise to achieve the purpose of active noise reduction. Compared with the traditional noise filter circuit, the noise elimination mode can eliminate noise more effectively from different time and different frequency bands.
The above embodiments are illustrative of specific embodiments of the present invention, and are not restrictive of the present invention, and those skilled in the relevant art can make various changes and modifications without departing from the spirit and scope of the present invention to obtain corresponding equivalent technical solutions, and therefore all equivalent technical solutions should be included in the scope of the present invention.
Claims (6)
1. A noise elimination circuit applied to medium-voltage power line communication equipment is characterized by comprising an equipment MCU circuit, a noise acquisition circuit, a noise analysis circuit, a noise sending circuit and a noise receiving circuit;
the connection relationship among the modules is as follows: the equipment MCU circuit is connected with the noise acquisition circuit and the noise analysis circuit, and the noise acquisition circuit is connected with the noise analysis circuit, the noise transmitting circuit and the noise receiving circuit.
2. The noise cancellation circuit applied to the medium voltage power line communication equipment according to claim 1, wherein the equipment MCU circuit controls the noise collection circuit to collect the line noise in an automatic gain control mode when the medium voltage power line communication equipment connected to the power grid is in a non-working state, and stops the noise collection when the communication equipment is in a working state; after finishing an acquisition period, the MCU circuit controls the noise transmitting circuit to continuously output noise.
3. The noise cancellation circuit applied to the medium voltage power line communication equipment according to claim 1, wherein the noise collection circuit collects medium voltage power line noise according to a command of an equipment MCU circuit; and carrying out voltage reduction collection on the noise higher than the input upper limit of the noise collection circuit, and carrying out amplification collection on the noise lower than the input lower limit of the noise collection circuit.
4. The noise cancellation circuit applied to the medium voltage power line communication equipment as claimed in claim 1, wherein the noise analysis circuit processes the noise after analyzing the frequency spectrum, phase and amplitude of the noise at different time and different frequency bands after the noise collection circuit collects the noise, and obtains and stores a noise signal with the phase opposite to that of the line noise signal and the amplitude equal to that of the line noise signal.
5. The noise cancellation circuit applied to the medium voltage power line communication equipment according to claim 1, wherein the noise transmission circuit amplifies a noise signal which is obtained after the processing of the noise analysis circuit and has an opposite phase and an equal amplitude with a line noise signal, and then transmits the amplified noise signal to the noise receiving circuit.
6. The circuit according to claim 1, wherein the noise receiving circuit receives a valid signal from the communication device, and receives a noise signal with an opposite phase and an equal amplitude to the line noise signal from the noise transmitting circuit, and the noise signal cancels the actual line noise signal, so as to reduce noise.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202110171305.9A CN112910505A (en) | 2021-02-03 | 2021-02-03 | Noise elimination circuit applied to medium-voltage power line communication equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110171305.9A CN112910505A (en) | 2021-02-03 | 2021-02-03 | Noise elimination circuit applied to medium-voltage power line communication equipment |
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| CN112910505A true CN112910505A (en) | 2021-06-04 |
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| CN202110171305.9A Pending CN112910505A (en) | 2021-02-03 | 2021-02-03 | Noise elimination circuit applied to medium-voltage power line communication equipment |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009021678A (en) * | 2007-07-10 | 2009-01-29 | Fujitsu Telecom Networks Ltd | Power line communication system, and noise component removal control method |
| CN102997990A (en) * | 2012-12-18 | 2013-03-27 | 中国电力科学研究院 | Power transmission line audible noise and radio disturbance long-time measurement system and method |
| CN105356886A (en) * | 2015-06-26 | 2016-02-24 | 深圳市国电科技通信有限公司 | Power line noise compression method and device thereof based on compressive sensing |
| CN106411363A (en) * | 2016-11-23 | 2017-02-15 | 湖南威胜信息技术有限公司 | Power line carrier communication automatic gain control method |
| CN106533504A (en) * | 2015-09-11 | 2017-03-22 | 国网天津市电力公司 | Method for eliminating harmonic noise interference for power line carrier of fixed receiving-transmitting field with standard source |
| CN108880622A (en) * | 2018-09-20 | 2018-11-23 | 广东石油化工学院 | The recognition methods and system of impulsive noise in a kind of electric line communication system |
| CN109357752A (en) * | 2018-10-23 | 2019-02-19 | 国网天津市电力公司电力科学研究院 | A kind of method of low-voltage power line platform area's testing impedance and Noise Acquisition |
| CN210899204U (en) * | 2019-08-27 | 2020-06-30 | 青岛东软载波科技股份有限公司 | Intelligent detection device for centralized meter reading communication faults |
| US20200379055A1 (en) * | 2019-05-29 | 2020-12-03 | Siemens Aktiengesellschaft | Method, Device and System for Determining an Arc on a Power Transmission Line |
-
2021
- 2021-02-03 CN CN202110171305.9A patent/CN112910505A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009021678A (en) * | 2007-07-10 | 2009-01-29 | Fujitsu Telecom Networks Ltd | Power line communication system, and noise component removal control method |
| CN102997990A (en) * | 2012-12-18 | 2013-03-27 | 中国电力科学研究院 | Power transmission line audible noise and radio disturbance long-time measurement system and method |
| CN105356886A (en) * | 2015-06-26 | 2016-02-24 | 深圳市国电科技通信有限公司 | Power line noise compression method and device thereof based on compressive sensing |
| CN106533504A (en) * | 2015-09-11 | 2017-03-22 | 国网天津市电力公司 | Method for eliminating harmonic noise interference for power line carrier of fixed receiving-transmitting field with standard source |
| CN106411363A (en) * | 2016-11-23 | 2017-02-15 | 湖南威胜信息技术有限公司 | Power line carrier communication automatic gain control method |
| CN108880622A (en) * | 2018-09-20 | 2018-11-23 | 广东石油化工学院 | The recognition methods and system of impulsive noise in a kind of electric line communication system |
| CN109357752A (en) * | 2018-10-23 | 2019-02-19 | 国网天津市电力公司电力科学研究院 | A kind of method of low-voltage power line platform area's testing impedance and Noise Acquisition |
| US20200379055A1 (en) * | 2019-05-29 | 2020-12-03 | Siemens Aktiengesellschaft | Method, Device and System for Determining an Arc on a Power Transmission Line |
| CN210899204U (en) * | 2019-08-27 | 2020-06-30 | 青岛东软载波科技股份有限公司 | Intelligent detection device for centralized meter reading communication faults |
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