CN104242987A - Balanced transmission technology suitable for low-voltage power line carrier communication - Google Patents
Balanced transmission technology suitable for low-voltage power line carrier communication Download PDFInfo
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- CN104242987A CN104242987A CN201310226378.9A CN201310226378A CN104242987A CN 104242987 A CN104242987 A CN 104242987A CN 201310226378 A CN201310226378 A CN 201310226378A CN 104242987 A CN104242987 A CN 104242987A
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Abstract
The invention discloses balanced transmission technology suitable for low-voltage power line carrier communication, which belongs to the field of low-voltage power line carrier communication and controlling. According to the balanced transmission technology, an inherent AC commercial power three-phase four-wire wiring manner is used; a balanced transmitting manner is adopted at a transmitting end; a carrier signal is modulated to symmetrical differential signals; two phase wires and a zero wire are used for realizing carrier signal transmission; a non-balanced receiving manner is adopted at a receiving end, and namely a phase wire and a zero wire are used for realizing carrier signal receiving. According to the balanced transmission technology, the carrier signal is transmitted in a two-phase balanced manner; and mutual offset between the zero wire and space can be realized, thereby effectively restraining carrier signal crosstalk caused by common zero wire or space radiation between adjacent distribution transformers, and remarkably improving success rate of carrier communication. An existing carrier receiving mechanism is required for single-phase non-balanced receiving. Extra cost and complexity increase after differential demodulation are prevented.
Description
Technical field
The present invention relates to low-voltage powerline carrier communication and control field, specifically carrier signal transmission technology, particularly relate to a kind of balanced transmission techniques being applicable to low-voltage powerline carrier communication.
Background technology
In recent years, low-voltage powerline carrier communication is widely applied in automatic data logging field, wherein zero line and ground wire generally connect together raising fail safe by low-voltage power supply transformer, so very easily pass through zero line or space radiation crosstalk altogether when transmitting terminal sends carrier signal under causing distribution transformer to adjacent distribution transformer, create wave carrier conflict, carrier communication success rate is caused to decline, so how to avoid the signal disturbing system worked well of crosstalk to seem particularly important.
Signal cross-talk major part is avoided to be the mode adopting copy reading at times at present, i.e. staggering time operating carrier communication system under adjacent distribution transformer.But this mode not only causes the waste of time resource, also likely cause adjacent distribution transformer all cannot complete the copy reading success rate of 100% in planning time.
For above problem, in conjunction with current advanced technology, develop a kind of balanced transmission techniques being applicable to low-voltage powerline carrier communication.This technology makes full use of the intrinsic wire laying mode of electric main three-phase and four-line, to make on zero line and carrier signal that space exists significantly reduces, and effectively to suppress between adjacent distribution transformer the carrier signal cross-interference issue that zero line or space radiation altogether cause.
Summary of the invention
Current electric main all uses the intrinsic wire laying mode of three-phase and four-line, and convention carrier signalling formula all uses the non-equilibrium send mode of a phase line and a zero line, therefore zero line exists carrier current, and easy crosstalk is to adjacent distribution transformer.A kind of balanced transmission techniques being applicable to low-voltage powerline carrier communication that the present invention proposes, transmitting terminal adopts balance send mode, and namely carrier signal modulation becomes symmetrical differential signal, utilizes two phase lines and zero line to realize the transmission of carrier signal; Receiving terminal adopts non-equilibrium receive mode, namely utilizes a phase line and zero line to realize the reception of carrier signal.In the technology of the present invention, biphase equilibrium sends carrier signal, can cancel out each other on zero line He in space, effectively to suppress between adjacent stations district supply transformer the carrier signal crosstalk that zero line or space radiation altogether cause, thus the success rate of significantly lifting carrier communication.Single-phase non-equilibrium reception only need continue to use existing carrier receiver system, avoids the raising introducing extra cost and complexity after differential ference spiral.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.In the accompanying drawings:
Fig. 1 is traditional carrier communication transmission technology schematic diagram;
Fig. 2 is carrier communication balanced transmission techniques schematic diagram of the present invention.
Embodiment
Clearly understand for making the object, technical solutions and advantages of the present invention, below in conjunction with embodiment of the present invention accompanying drawing, description clear, complete is further done to the technical scheme in the embodiment of the present invention, obviously, described embodiment is the one of the embodiment of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Current electric main all uses the intrinsic wire laying mode of three-phase and four-line, convention carrier signalling formula all uses the non-equilibrium send mode of a phase line and a zero line, such as transmitting terminal sends carrier signal in A phase, then there is forward carrier signal electric current in A phase line, there is not carrier signal electric current in B phase line and C phase line, can be obtained on zero line there is reverse carrier current by signal phasor relation; Receiving terminal uses the non-equilibrium receive mode of a phase line and a zero line equally, namely between A phase line and zero line, detects reception carrier signal voltage, completes the transmission of carrier signal, as Fig. 1.But because adjacent distribution transformer ubiquity is total to the phenomenon of zero line, therefore the reverse carrier current on zero line is easy to a shunting part and connects on electric main to adjacent distribution transformer, if now adjacent distribution transformer connect on electric main also in the transmission carrying out carrier signal, the carrier signal that electric main transmits will crosstalk mutually, causes carrier communication failure.And the long-term existence of zero-sequence current not only can increase the loss of distribution transformer, the normal work of residential electricity consumption equipment also can be affected together with the space radiation signal simultaneously produced.
The present invention produces by asymmetrical carrier signal transmission technology, carrier signal send mode uses the balance send mode of two phase lines and a zero line, such as transmitting terminal is in A phase line transmission carrier signal, carrier signal modulation becomes symmetrical differential signal, send carrier signal respectively in A phase and B phase, wherein A phase line sends forward carrier signal electric current, and B phase line sends reverse carrier signal electric current, there is not carrier signal electric current in C phase line, can be obtained on zero line there is not carrier signal electric current by signal phasor relation; Receiving terminal still uses the non-equilibrium receive mode of a phase line and a zero line, namely between A phase line and zero line, detects reception carrier signal voltage, finally completes the transmission of carrier signal, as Fig. 2.Due to zero line not existing carrier signal electric current, even if adjacent distribution transformer common zero line also can not carrier signal current distributing, also would not cause the mutual crosstalk of carrier signal, significantly can promote the success rate of carrier communication.And the space radiation energy that A phase line and B phase line two-way produce also can be offset in a large number, effectively avoid neutral line current and space radiation to the harm of distribution transformer and residential electricity consumption.Simultaneously receive mode is constant, avoids introducing the raising of extra cost and complexity after differential ference spiral.
Finally it should be noted that, above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that; It still can be modified to the technical scheme described in previous embodiment, or carries out equivalent replacement to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of embodiment of the present invention technical scheme.
Claims (5)
1. be applicable to a balanced transmission techniques for low-voltage powerline carrier communication, it is characterized in that, it utilizes the intrinsic wire laying mode of electric main three-phase and four-line, and transmitting terminal adopts balance send mode, and receiving terminal adopts non-equilibrium receive mode.
2. be applicable to the balanced transmission techniques of low-voltage powerline carrier communication as claimed in claim 1, it is characterized in that, balance send mode is that carrier signal modulation is become symmetrical differential signal, utilizes two phase lines and zero line to realize the transmission of carrier signal.
3. be applicable to the balanced transmission techniques of low-voltage powerline carrier communication as claimed in claim 1, it is characterized in that, non-equilibrium receive mode is the reception utilizing a phase line and zero line to realize carrier signal.
4. be applicable to the balanced transmission techniques of low-voltage powerline carrier communication as claimed in claim 1, it is characterized in that, applicable situation is the wire laying mode that electric main adopts three-phase and four-line, and wherein three lines are phase line or live wire, respectively with A B C identify, single line is zero line in addition.
5. be applicable to the balanced transmission techniques of low-voltage powerline carrier communication as claimed in claim 1 or 2, it is characterized in that, biphase equilibrium sends carrier signal, can cancel out each other on zero line He in space.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310226378.9A CN104242987A (en) | 2013-06-08 | 2013-06-08 | Balanced transmission technology suitable for low-voltage power line carrier communication |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310226378.9A CN104242987A (en) | 2013-06-08 | 2013-06-08 | Balanced transmission technology suitable for low-voltage power line carrier communication |
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| CN104242987A true CN104242987A (en) | 2014-12-24 |
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| CN201310226378.9A Pending CN104242987A (en) | 2013-06-08 | 2013-06-08 | Balanced transmission technology suitable for low-voltage power line carrier communication |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104868936A (en) * | 2015-05-12 | 2015-08-26 | 国网重庆市电力公司电力科学研究院 | Anti-crosstalk device and anti-crosstalk system |
| CN105575099A (en) * | 2015-12-17 | 2016-05-11 | 广州市雅江光电设备有限公司 | Ground differential signal transmission circuit |
| WO2020061744A1 (en) * | 2018-09-25 | 2020-04-02 | 华为技术有限公司 | Method and device for plc control |
| CN111126141A (en) * | 2019-11-19 | 2020-05-08 | 深圳供电局有限公司 | Method, device and system for identifying station area, computer equipment and readable storage medium |
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| US20090134699A1 (en) * | 2007-11-23 | 2009-05-28 | Korea Electro Technology Research Institute | Signal Coupling Apparatus For Power Line Communications Using A Three-Phase Four-Wire Power Line |
| CN102104399A (en) * | 2011-01-16 | 2011-06-22 | 郭建国 | System for ensuring power line carrier communications between energy meter gateways and white information appliances |
| CN102594408A (en) * | 2012-03-15 | 2012-07-18 | 北京华强智连微电子有限责任公司 | Realization method of low-voltage power line communication |
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| JP2001230708A (en) * | 2000-02-18 | 2001-08-24 | Osaki Electric Co Ltd | Power line data transmission system |
| CN1454414A (en) * | 2000-05-30 | 2003-11-05 | 阿斯科姆电力线通讯有限公司 | Coupling device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104868936A (en) * | 2015-05-12 | 2015-08-26 | 国网重庆市电力公司电力科学研究院 | Anti-crosstalk device and anti-crosstalk system |
| CN105575099A (en) * | 2015-12-17 | 2016-05-11 | 广州市雅江光电设备有限公司 | Ground differential signal transmission circuit |
| WO2020061744A1 (en) * | 2018-09-25 | 2020-04-02 | 华为技术有限公司 | Method and device for plc control |
| CN112753168A (en) * | 2018-09-25 | 2021-05-04 | 华为技术有限公司 | PLC control method and device |
| CN112753168B (en) * | 2018-09-25 | 2021-12-28 | 华为技术有限公司 | PLC control method and device |
| US11791864B2 (en) | 2018-09-25 | 2023-10-17 | Huawei Technologies Co., Ltd. | PLC control method and apparatus |
| CN111126141A (en) * | 2019-11-19 | 2020-05-08 | 深圳供电局有限公司 | Method, device and system for identifying station area, computer equipment and readable storage medium |
| CN111126141B (en) * | 2019-11-19 | 2023-12-29 | 深圳供电局有限公司 | Area identification method, apparatus, system, computer device and readable storage medium |
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Application publication date: 20141224 |