CN102594408A - Method for realizing low-voltage power line communication - Google Patents
Method for realizing low-voltage power line communication Download PDFInfo
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- CN102594408A CN102594408A CN201210067634XA CN201210067634A CN102594408A CN 102594408 A CN102594408 A CN 102594408A CN 201210067634X A CN201210067634X A CN 201210067634XA CN 201210067634 A CN201210067634 A CN 201210067634A CN 102594408 A CN102594408 A CN 102594408A
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Abstract
The invention discloses a method for realizing low-voltage power line communication, which comprises the steps of providing a time reference signal through a time reference circuit, sending the time reference signal to a control circuit, calculating the zero crossing time t0 of power frequency voltage by the control circuit, and connecting a load to a power line near t0 to change the waveform trend of the power line voltage, thereby sending information. Compared with the prior carrier communication technology, the invention can greatly improve the reliability of power line data transmission, realize reliable point-to-point communication in a transformer area, and achieve the requirements of real-time communication and real-time control without communication in a relay mode. The communication implementation method of the invention can not cause crosstalk to the power lines of adjacent transformer areas, thereby avoiding the problem of transformer area crosstalk.
Description
Technical field
The present invention relates to low-voltage power line transfer of data, low-voltage power line communication.
Background technology
Use the power line transmission data, generally use high frequency carrier, the narrow band communication carrier frequency is 5KHz-500KHz, the above carrier frequency of broadband connections 2MHz commonly used.Carrier frequency is high more, and the decay of signal on power line is big more, and communication distance is near more, and is subject to the noise jamming on the power line.Especially on carrier meter reading, Long-distance Control etc. were used, existing arrowband and bandwidth carrier communication distance all can not cover whole transformer platform district, need communicate by letter through the mode of relaying, therefore were difficult to accomplish reliable real time communication and control; And the carrier signal between the different transformer platforms district, because cabling closes on and crosstalks mutually easily, receiving terminal is difficult to difference.
Summary of the invention
The present invention seeks to solve the problem that present power line communication exists, a kind of remote highly reliable communication means is provided.The present invention is a kind of method that can reliable communication in whole transformer platform district, realizes point-to-point direct communication, reaches the requirement of real time communication and control.Do not use high frequency carrier, therefore do not have the problem of signal cross-talk.
Technical scheme of the present invention is following:
A kind of low-voltage power line realization of Communication method; Through the time reference circuit time reference signal is provided; Give control circuit, the access of control circuit control load and disconnection is characterized in that: access and disconnecting consumers make the waveform trend of power voltage line change;
Described time reference circuit is a zero cross detection circuit;
Described time reference circuit is to provide the circuit that definite time relationship signal is arranged with zero crossing;
Described control circuit calculates power-frequency voltage zero crossing time t0, and near t0, load is inserted and break off control;
The waveform trend of described power voltage line changes; Be that control circuit calculates the voltage over zero time t0; When t0 times prior t0-tb, begin to insert load, break off during to t0, interior during this period of time owing to insert load between live wire and zero line; Make voltage trend change, zero hot voltage approaches zero fast;
The waveform trend of described power voltage line changes; Be that control circuit calculates the voltage over zero time t0; Begin to insert load in the t0 time, break off during t0+ta after the time to t0, during this period of time in owing to insert load between live wire and zero line; Make voltage trend change, zero hot voltage slowly rises;
The waveform trend of described power voltage line changes; Be that control circuit calculates the voltage over zero time t0; When t0 times prior t0-tb after the t0 time during t0+ta in the middle of the random time section insert and disconnecting consumers; Owing to insert load between live wire and zero line, make zero hot voltage before zero passage, approach zero fast during this period of time, slowly rise after the zero passage;
Described load is passive resistive, capacitive, perception or combination load;
Described load is electronic loads such as electronic switch, electronic impedance, voltage source, current source, power source.
At receiving terminal, the waveform trend of power voltage line is detected, and the power line waveform trend is carried out the characteristic contrast when not sending signal, whether can judge has information on cable, to transmit.
Good effect of the present invention
Compare with existing carrier communication, the present invention can increase substantially the power line reliability of data transmission, realizes reliable point-to-point communication in the transformer platform district, needn't communicate by letter through the mode of relaying, reaches real time communication and the requirement of control in real time.And Communication Realization method of the present invention can not cause the power line in adjacent stations district and crosstalk the problem of having avoided the platform district to crosstalk.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is further specified.
Fig. 1 is the system block diagram that the present invention implements
Fig. 2 is the system block diagram of embodiment of the present invention
Fig. 3 is the power voltage line waveform trend when not having signal to send
Fig. 4 is the power voltage line waveform trend of breaking off when when t0-tb, inserting the MOS switch to t0
Fig. 5 is the power voltage line waveform trend of breaking off when when t0, inserting the MOS switch to t0+ta
Fig. 6 is the power voltage line waveform trend of breaking off when when t0-tb, inserting the MOS switch to t0+ta
The practical implementation method
Be application with 220V50Hz low-voltage power line at home below, further specify implementation method of the present invention in conjunction with instance, but the scope that does not limit the present invention in any way.
The circuit block diagram that the present invention implements is as shown in Figure 2.It is moment of zero that the zero passage detection module is used to detect voltage between zero line and live wire, produces zero cross signal as time reference, and control circuit realizes that with MCU controllable MOS switch is as load.
Because the voltage cycle of power line is fixed value 20ms; Zero passage is spaced apart 10ms each time; Therefore MCU can accurately calculate next zero passage t0 constantly according to the zero cross signal that zero cross detection circuit provides; Also can calculate the t0-tb of t0 times prior and the t0+ta after the t0 time, be used to control the access and the disconnection of MOS switch.
Zero cross signal when MCU does not modulate on receiving power line, counter O reset picks up counting.10ms is next zero-crossing timing point, is designated as t0, and is as shown in Figure 3;
Suppose that tb is 200us, ta is 100us, t0-tb=9.8ms so, t0+ta=10.1ms.When having data to send; With MOS switch place in circuit, the access of load makes the voltage between zero line and live wire approach zero fast to MCU, during to 10ms the MOS switch is broken off when 9.8ms; The power line load restoration is normal, and the voltage waveform trend on the power line is as shown in Figure 4;
Perhaps with MOS switch place in circuit, the access of load makes the voltage between zero line and live wire slowly rise to MCU when 10ms, to 10.1ms the MOS switch is broken off, and the power line load restoration is normal, and the voltage waveform trend on the power line is as shown in Figure 5;
Perhaps MCU when 9.8ms with MOS switch place in circuit; Make the voltage between zero line and live wire approach zero fast, voltage slowly rises after the zero passage, to 10.1ms the MOS switch is broken off; The power line load restoration is normal, and voltage waveform trend is as shown in Figure 6 on the power line.
At receiving terminal, gather the power line waveform trend, carry out data processing, power line waveform trend characteristic contrast when not sending signal, whether promptly know has information on power line, to transmit.
The present invention is not limited to above-mentioned embodiment, and those skilled in the art obviously can also find out many selections, combination, modification and change on the basis of above explanation.As long as the mode of utilizing the loading of power-frequency voltage zero cross near to change voltage waveform trend communicates, all drop on protection scope of the present invention.
Claims (8)
1. low-voltage power line realization of Communication method; Through the time reference circuit time reference signal is provided; Give control circuit, the access of control circuit control load and disconnection is characterized in that: access and disconnecting consumers make the waveform trend of power voltage line change.
2. low-voltage power line realization of Communication method as claimed in claim 1, wherein said time reference circuit is a zero cross detection circuit.
3. low-voltage power line realization of Communication method as claimed in claim 1, wherein said time reference circuit is to provide the circuit that definite time relationship signal is arranged with zero crossing.
4. low-voltage power line realization of Communication method as claimed in claim 1; The waveform trend of wherein said power voltage line changes, and is that control circuit calculates power-frequency voltage zero crossing time t0, when t0 times prior t0-tb, begins to insert load; Break off during to t0; Owing to insert load between live wire and zero line, make voltage trend change during this period of time, zero hot voltage approaches zero fast.
5. low-voltage power line realization of Communication method as claimed in claim 1; The waveform trend of wherein said power voltage line changes; Be that control circuit calculates power-frequency voltage zero crossing time t0, begin to insert in the t0 time and load to t0 and break off during t0+ta the time after, during this period of time in owing to inserting load between live wire and zero line; Make voltage trend change, zero hot voltage slowly rises.
6. low-voltage power line realization of Communication method as claimed in claim 1; The waveform trend of wherein said power voltage line changes; Be that control circuit calculates power-frequency voltage zero crossing time t0, when t0 times prior t0-tb after the t0 time during t0+ta in the middle of the random time section insert and disconnecting consumers, during this period of time in owing to insert load between live wire and zero line; Make zero hot voltage before zero passage, approach zero fast, slowly rise after the zero passage.
7. low-voltage power line realization of Communication method as claimed in claim 1, wherein said load are passive resistive, capacitive, perception or combination load.
8. low-voltage power line realization of Communication method as claimed in claim 1, wherein said load is electronic loads such as electronic switch, electronic impedance, voltage source, current source, power source.
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| CN201210067634XA CN102594408A (en) | 2012-03-15 | 2012-03-15 | Method for realizing low-voltage power line communication |
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| CN201210067634XA CN102594408A (en) | 2012-03-15 | 2012-03-15 | Method for realizing low-voltage power line communication |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103746786A (en) * | 2014-01-10 | 2014-04-23 | 中国人民解放军重庆通信学院 | OFDM (orthogonal frequency division multiplexing) frame design suitable for transmission of zero crossing point of power line communication |
| CN103944607A (en) * | 2014-04-14 | 2014-07-23 | 江苏益邦电力科技有限公司 | Low voltage power line carrier communication signal detection device |
| CN104242987A (en) * | 2013-06-08 | 2014-12-24 | 青岛鼎信通讯股份有限公司 | Balanced transmission technology suitable for low-voltage power line carrier communication |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101251951A (en) * | 2008-04-03 | 2008-08-27 | 中国电力科学研究院 | Power distribution network industrial frequency communicating method and system |
| US20100008858A1 (en) * | 2007-01-11 | 2010-01-14 | Immunomedics, Inc. | Methods and Compositions for Improved F-18 Labeling of Proteins, Peptides and Other Molecules |
| CN201623706U (en) * | 2010-02-08 | 2010-11-03 | 长沙威胜信息技术有限公司 | Low-voltage power line carrier communication module |
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- 2012-03-15 CN CN201210067634XA patent/CN102594408A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100008858A1 (en) * | 2007-01-11 | 2010-01-14 | Immunomedics, Inc. | Methods and Compositions for Improved F-18 Labeling of Proteins, Peptides and Other Molecules |
| CN101251951A (en) * | 2008-04-03 | 2008-08-27 | 中国电力科学研究院 | Power distribution network industrial frequency communicating method and system |
| CN201623706U (en) * | 2010-02-08 | 2010-11-03 | 长沙威胜信息技术有限公司 | Low-voltage power line carrier communication module |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104242987A (en) * | 2013-06-08 | 2014-12-24 | 青岛鼎信通讯股份有限公司 | Balanced transmission technology suitable for low-voltage power line carrier communication |
| CN103746786A (en) * | 2014-01-10 | 2014-04-23 | 中国人民解放军重庆通信学院 | OFDM (orthogonal frequency division multiplexing) frame design suitable for transmission of zero crossing point of power line communication |
| CN103944607A (en) * | 2014-04-14 | 2014-07-23 | 江苏益邦电力科技有限公司 | Low voltage power line carrier communication signal detection device |
| CN103944607B (en) * | 2014-04-14 | 2016-06-01 | 江苏益邦电力科技有限公司 | Low-voltage powerline carrier communication signal supervisory instrument |
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Application publication date: 20120718 |