CN102447493A - Communication method based on low-voltage power line, and communication device - Google Patents
Communication method based on low-voltage power line, and communication device Download PDFInfo
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Abstract
The embodiment of the invention discloses a communication method based on a low-voltage power line. The method comprises the following steps of: executing fixed voltage phase detection on an industrial frequency sinusoidal AC (alternating current) of a low-voltage power line; applying a transient zero-pulse signal on a fixed voltage phase part on each period of the industrial frequency sinusoidal AC based on the low-voltage power line, and loading the transmission information in the sinusoidal AC; modulating the pulse signal to which the transmission information is loaded, and then transmitting the modulated pulse signal to a signal receiving end; and demodulating the transient zero-pulse signal applied on the fixed voltage phase part and analyzing the transmission information on the low-voltage power line, by the signal receiving end. The embodiment of the invention further discloses a communication device. With the method and the device, the advantages of long transmission distance, strong interference rejection and low cost of the low-voltage power line communication are realized.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of communication means and communicator based on the voltage electricity line.
Background technology
(Power Line Communication PLC) is meant and utilizes existing low-voltage power spider lines as transmission medium low-voltage powerline carrier communication, realizes a kind of technology of data passes and information exchange.It has need not wiring, wide coverage, the characteristics that showing easy to connect, thereby has very high application potential.This transmission channel of low-voltage powerline carrier communication distributes extensively, need not to build in addition, the characteristics of plug and play, conveniently moving have very strong attraction for the demand that satisfies people, and this technology causes people's attention now just day by day.
There are defectives such as cost is high, antijamming capability is weak, transmission range is not long in existing low-voltage powerline carrier communication; In China,, even can not use at present even the low-voltage power line communication products of American-European countries's maturation are but very undesirable in the result of use of China.Therefore, need to adopt the higher carrier communication processing mode of a kind of cost performance, select suitable modulation-demodulation technique, carry out data accurately, the transmission of stable and length distance, to satisfy the continuous development of current home network.
Summary of the invention
The objective of the invention is to overcome the deficiency of prior art; The invention provides a kind of communication means and communicator based on low-voltage power line; Through implementing this technical scheme, solve defectives such as existing plc communication cost is high, antijamming capability is weak, transmission range is not long.
In order to address the above problem, the present invention proposes a kind of communication means based on low-voltage power line, comprising:
Power frequency sinusoidal ac to low-voltage power line carries out the fixed voltage phase-detection;
To applying instantaneous zero pulse signal, transmission information is carried in the sinusoidal ac based on the fixed voltage phase place place on each cycle of the power frequency sinusoidal ac of low-voltage power line;
After the pulse signal that loads transmission information carried out the signal modulation, send to signal receiving end;
The instantaneous zero pulse signal that the said fixed voltage phase place of signal receiving end demodulation place applies is resolved said low-voltage power line and is uploaded transmission information.
Said power frequency sinusoidal ac to low-voltage power line carries out the fixed voltage phase-detection and comprises:
Sinusoidal ac is carried out the full-wave rectification without filtering,, become at power frequency sinusoidal ac stationary phase place and carry out the square-wave signal that level conversion has certain duty ratio through ratio step-down, comparator, shaping circuit.
Saidly comprise applying instantaneous zero pulse signal based on the fixed voltage phase place place on each cycle of the power frequency sinusoidal ac of low-voltage power line:
Positive half cycle or the fixed voltage phase place place of negative half period in each cycle applies instantaneous zero pulse signal to the power frequency sinusoidal ac.
The instantaneous zero pulse signal that the said fixed voltage phase place of said signal receiving end demodulation place applies, resolve said low-voltage power line and upload transmission information and comprise:
During the signal receiving end restituted signal, whether be loaded with transmission information on the modulating pulse identification low-voltage power line of fixed width according to each fixed voltage phase place place in cycle, and carry out corresponding sampling processing, judge the data message of said transmission information representative.
Said transport packet is drawn together synchronizing frame head, communication objective address, performance data and check code.
Accordingly, the embodiment of the invention also provides a kind of communicator, and said communicator comprises:
Phase detecting circuit is used for the power frequency sinusoidal ac of low-voltage power line is carried out the fixed voltage phase-detection;
Modulation circuit is used for to applying instantaneous zero pulse signal based on 1～4 fixed voltage phase place place on each cycle of the power frequency sinusoidal ac of low-voltage power line transmission information being carried in the sinusoidal ac; After the pulse signal that loads transmission information carried out the signal modulation, send to signal receiving end;
The sampling processing circuit is used for the instantaneous zero pulse signal that applies at the said fixed voltage phase place of signal receiving end demodulation place, resolves said low-voltage power line and uploads transmission information.
Said phase detecting circuit is used for just, and sinusoidal ac, becomes at power frequency sinusoidal ac stationary phase place and carries out the square-wave signal that level conversion has certain duty ratio through ratio step-down, comparator, shaping circuit through full-wave rectification.
Said modulation circuit applies instantaneous zero pulse signal to the positive half cycle in each cycle of power frequency sinusoidal ac or the fixed voltage phase place place of negative half period.
Whether be loaded with transmission information on the modulating pulse identification low-voltage power line of fixed width of said sampling processing circuit according to each fixed voltage phase place place in cycle, and carry out corresponding sampling processing, judge the data message of said transmission information representative.
Said transport packet is drawn together synchronizing frame head, communication objective address, performance data and check code.
Technology through embodiment of the present invention embodiment; Can be through about 1000 meters of low-voltage power line reliable transmission distances; Transmitting range is far away; Antijamming capability is strong, and has advantage cheaply, can apply to widely that household electric appliances control, power line are checked meter, multiple occasions such as street lamp is controlled, building automatic.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the communication means flow chart based on low-voltage power line in the embodiment of the invention;
Fig. 2 is that the 100Hz interrupt signal detection signal in the embodiment of the invention produces sketch map;
Fig. 3 is the signal modulation circuit structure principle chart in the embodiment of the invention;
Fig. 4 is the signal sampling treatment circuit structure principle chart in the embodiment of the invention;
Fig. 5 is the communication apparatus structure sketch map in the embodiment of the invention.
Embodiment
To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
Technology in the embodiment of the invention be power frequency sinusoidal ac at low-voltage power line in each cycle no matter be that the fixed voltage phase place place (1～4 place is arranged) of positive half cycle or negative half period adds an instantaneous zero pulse signal.Through after this pulse signal modulation; In each cycle of sinusoidal ac,, when the signal receiving end restituted signal, can discern information transmitted on the low-voltage power line according to the pulse pattern of this fixed width at this fixed voltage phase place place no matter be the zero pulse that just there is a fixed width at the fixed voltage phase place place (1～4 place is arranged) of positive half cycle or negative half period.
Concrete, Fig. 1 shows the communication means flow chart based on low-voltage power line in the embodiment of the invention, comprises the steps:
S101: the power frequency sinusoidal ac to low-voltage power line carries out the fixed voltage phase-detection;
This step is specifically carried out the fixed voltage phase-detection to the power frequency simple alternating current; Promptly at first the power frequency sinusoidal ac carries out the full-wave rectification without filtering; Pass through ratio step-down, comparator, shaping circuit then; Become the 100Hz square-wave signal with certain duty ratio that carries out level conversion at power frequency sinusoidal ac stationary phase place, square wave provides the external interrupt signal of 100Hz to microcontroller thus.Alternating current after sinusoidal ac, the rectification and the square-wave signal of 100Hz are as shown in Figure 2.
S102:, transmission information is carried in the sinusoidal ac to applying instantaneous zero pulse signal based on 1～4 fixed voltage phase place place on each cycle of the power frequency sinusoidal ac of low-voltage power line;
This step is mainly accomplished the transmission data must modulate work on low-voltage power line; Thereby realize the transmission of data message on power line; Its modulation circuit hardware elementary diagram as shown in Figure 3, wherein: N is for exchanging the zero line input, and signal ground links to each other with live wire L; Resistance R 2, R3 constitute bleeder circuit, guarantee that the F point voltage is not less than-5V.The D point is the data input pin of signal modulation, and when transmission one digit number certificate " 0 ", the D point is the high level signal of amplitude 5V always; This moment, the input of NAND gate U1 was a high level state, and output is a low level state, and then the input of NAND gate U2 is a low level; Output is a high level, and triode T3 conducting does not have voltage difference between the base stage of large power triode T1, T2 and the emitter; Therefore T1, not conducting of T2, thereby do not have the zero pulse signal to be modulated on the low-voltage power line; When transmission one digit number certificate " 1 "; A very short low level signal (pulsewidth of this low level signal is by C1 and the decision of microcontroller program) of duration appears in the D point; A zero pulse signal appears in the input at U1, and the U1 output pulsewidth occurs and equates the high level pulse signal, and the low level pulse signal that a pulsewidth equates appears in corresponding U2 output; This moment, triode T1 conducting made the live wire L and the reverse instantaneous conducting of zero line N of industrial-frequency alternating current; Meanwhile triode T3 ends, and causing has the instantaneous conducting of negative voltage official post T2 between base stage and the emitter of triode T2, thereby makes the live wire L and the instantaneous conducting of zero line N forward of industrial-frequency alternating current.The T1 triode has electric current to flow through at industrial-frequency alternating current negative half period stationary phase place (1～2 place is arranged) during instantaneous conducting; The T2 triode has electric current to flow through at the positive half cycle stationary phase of industrial-frequency alternating current place (1～2 place is arranged) during instantaneous conducting; Therefore no matter at positive half cycle of industrial frequency AC piezoelectric voltage or negative half period; On the power line as long as transmit data " 1 ", an instantaneous zero pulse signal can appear on power line.Therefore in the industrial-frequency alternating current one-period, there is 1～4 place all can transmitting data information.
S103: the pulse signal that will load transmission information sends to signal receiving end after carrying out the signal modulation;
S104: the instantaneous zero pulse signal that the said fixed voltage phase place of signal receiving end demodulation place applies, resolve said low-voltage power line and upload transmission information.
This step in the specific implementation; During the signal receiving end restituted signal; Whether be loaded with transmission information on the modulating pulse identification low-voltage power line of fixed width according to each fixed voltage phase place place in cycle, and carry out corresponding sampling processing, judge the data message of said transmission information representative.
To this step; Fig. 4 shows the signal sampling treatment circuit hardware elementary diagram in the embodiment of the invention; Wherein: signal ground links to each other with live wire L, and the N1 point is the zero line N of low-voltage power line and the signal (like the ac power waveform after the rectification among Fig. 1) after the live wire L process full-wave rectification (not filtering).Capacitor C 1 plays the effect of low frequency filtering, and transient pulse can pass through.The pulse signal of modulating on the power line gets into demodulator circuit from N1.R1, R2 constitute bleeder circuit, and the DC component current potential that makes the U1 in-phase input end is about 1V, and capacitor C 1 also constitutes pressure filter circuit with resistance R 2, and the alternating voltage amplitude that makes the R1 two ends is less than 4V, and protective circuit is not damaged.On the power line transmission one digit number when " 0 " voltage comparator U1 in the same way input terminal voltage be higher than reverse input end voltage always, U1 is output as height, so the output that E order is zero always.When the transmission one digit number is according to " 1 " on the power line; At sinusoidal ac is that the zero pulse signal appears in the phase place place of 5V; Therefore voltage comparator U1 in the same way input will current potential of instantaneous generation be lower than the potential pulse of signal ground; Make voltage comparator U1 output produce a low level pulse signal; Produce the high level pulse signal that amplitude is 5V through the reverse of NAND gate at the E point, microcontroller carries out sampling processing at the stationary phase place to this pulse signal according to the interrupt signal of 100Hz.
Further need to prove; The transmission signals here comprises synchronizing frame head (being generally 8), communication objective address (being generally 8) and performance data (being generally 16) and check code relevant informations such as (being generally 8); Through this communication means; Can reach more than 1000 meters through low-voltage power line reliable transmission distance, it has long transmission distance, it is strong to shoulder interference performance, and has low cost and other advantages; Have good using value, the light fixture that can realize connecting through PLC based on this technology, household electric appliances, ammeter etc. are realized Based Intelligent Control.
To the plc communication method in the embodiment of the invention; The embodiment of the invention provides a kind of communication apparatus structure sketch map, and the scheme based on this communicator is realized generally is loaded with corresponding receiver and transmitter; The concrete structure sketch map; This receiver and transmitter are being connected based on low-voltage power line, specifically can be in detail referring to Fig. 5, and this communicator comprises:
Transmitter is used for adding an instantaneous zero pulse signal regardless of the fixed voltage phase place place (1～4 place is arranged) that is positive half cycle or negative half period at the power frequency sinusoidal ac of low-voltage power line in each cycle.Through after this pulse signal modulation, in each cycle of sinusoidal ac no matter be the zero pulse that just there is a fixed width at the fixed voltage phase place place (1～4 place is arranged) of positive half cycle or negative half period.
Further, transmitter comprises:
Phase detecting circuit is used for the power frequency sinusoidal ac of low-voltage power line is carried out the fixed voltage phase-detection.The phase detecting circuit here is used for just, and sinusoidal ac, becomes at power frequency sinusoidal ac stationary phase place and carries out the square-wave signal that level conversion has certain duty ratio through ratio step-down, comparator, shaping circuit through full-wave rectification.Its concrete operation principle process is as shown in Figure 2.
Modulation circuit is used for to applying instantaneous zero pulse signal based on 1～4 fixed voltage phase place place on each cycle of the power frequency sinusoidal ac of low-voltage power line transmission information being carried in the sinusoidal ac; After the pulse signal that loads transmission information carried out the signal modulation, send to signal receiving end.The modulation circuit here applies instantaneous zero pulse signal to the positive half cycle in each cycle of power frequency sinusoidal ac or the fixed voltage phase place place of negative half period.Its concrete operation principle process is as shown in Figure 3.
The voltage electricity line is used for transmitting data information.The data message here generally comprises: synchronizing frame head (being generally 8), communication objective address (being generally 8) and performance data (being generally 16) and check code relevant informations such as (being generally 8).
Receiver can be discerned information transmitted on the low-voltage power line according to the pulse pattern of this fixed width at this fixed voltage phase place place.
Further, receiver comprises:
The sampling processing circuit is used for the instantaneous zero pulse signal that applies at the said fixed voltage phase place of signal receiving end demodulation place, resolves said low-voltage power line and uploads transmission information.Whether be loaded with transmission information on the modulating pulse identification low-voltage power line of fixed width of the sampling processing circuit here according to each fixed voltage phase place place in cycle, and carry out corresponding sampling processing, judge the data message of said transmission information representative.It adopts the concrete working method of treatment circuit as shown in Figure 4.
Transmitter in the embodiment of the invention generally is positioned at controlled end; Be used to make things convenient for the user to realize purposes such as control to household equipment; And receiver generally is positioned at equipment end such as household electrical appliances, light fixture, household electric appliances, ammeter, connects through power line like this and can realize the purpose to Equipment Control.
To sum up; Through the technical scheme among the embodiment of the present invention embodiment; Can reach more than 1000 meters through low-voltage power line reliable transmission distance, it has long transmission distance, it is strong to shoulder interference performance, and has low cost and other advantages; Have good using value, the light fixture that can realize connecting through PLC based on this technology, household electric appliances, ammeter etc. are realized Based Intelligent Control.
Above disclosedly be merely preferred embodiment of the present invention, can not limit the present invention's interest field certainly with this, the equivalent variations of therefore doing according to claim of the present invention still belongs to the scope that the present invention is contained.
Claims (10)
1. the communication means based on low-voltage power line is characterized in that, comprising:
Power frequency sinusoidal ac to low-voltage power line carries out the fixed voltage phase-detection;
To applying instantaneous zero pulse signal, transmission information is carried in the sinusoidal ac based on the fixed voltage phase place place on each cycle of the power frequency sinusoidal ac of low-voltage power line;
After the pulse signal that loads transmission information carried out the signal modulation, send to signal receiving end;
The instantaneous zero pulse signal that the said fixed voltage phase place of signal receiving end demodulation place applies is resolved said low-voltage power line and is uploaded transmission information.
2. the communication means based on low-voltage power line as claimed in claim 1 is characterized in that, said power frequency sinusoidal ac to low-voltage power line carries out the fixed voltage phase-detection and comprises:
Sinusoidal ac is carried out the full-wave rectification without filtering, pass through ratio step-down, comparator, shaping circuit again, become at power frequency sinusoidal ac stationary phase place and carry out the square-wave signal that level conversion has certain duty ratio.
3. the communication means based on low-voltage power line as claimed in claim 1 is characterized in that, saidly comprises applying instantaneous zero pulse signal based on the fixed voltage phase place place on each cycle of the power frequency sinusoidal ac of low-voltage power line:
Positive half cycle or the fixed voltage phase place place of negative half period in each cycle applies instantaneous zero pulse signal to the power frequency sinusoidal ac.
4. like each described communication means of claim 1 to 3, it is characterized in that the instantaneous zero pulse signal that the said fixed voltage phase place of said signal receiving end demodulation place applies is resolved said low-voltage power line and uploaded transmission information and comprise based on low-voltage power line:
During the signal receiving end restituted signal, whether be loaded with transmission information on the modulating pulse identification low-voltage power line of fixed width according to each fixed voltage phase place place in cycle, and carry out corresponding sampling processing, judge the data message of said transmission information representative.
5. the communication means based on low-voltage power line as claimed in claim 4 is characterized in that, said transport packet is drawn together synchronizing frame head, communication objective address, performance data and check code.
6. a communicator is characterized in that, said communicator comprises:
Phase detecting circuit is used for the power frequency sinusoidal ac of low-voltage power line is carried out the fixed voltage phase-detection;
Modulation circuit is used for to applying instantaneous zero pulse signal based on the fixed voltage phase place place on each cycle of the power frequency sinusoidal ac of low-voltage power line transmission information being carried in the sinusoidal ac; After the pulse signal that loads transmission information carried out the signal modulation, send to signal receiving end;
The sampling processing circuit is used for the instantaneous zero pulse signal that applies at the said fixed voltage phase place of signal receiving end demodulation place, resolves said low-voltage power line and uploads transmission information.
7. communicator as claimed in claim 6; It is characterized in that; Said phase detecting circuit is used for just, and sinusoidal ac carries out the full-wave rectification without filtering; Through ratio step-down, comparator, shaping circuit, become at power frequency sinusoidal ac stationary phase place and carry out the square-wave signal that level conversion has certain duty ratio.
8. communicator as claimed in claim 6 is characterized in that, said modulation circuit applies instantaneous zero pulse signal to the positive half cycle in each cycle of power frequency sinusoidal ac or the fixed voltage phase place place of negative half period.
9. like each described communicator of claim 6 to 8; It is characterized in that; Whether be loaded with transmission information on the modulating pulse identification low-voltage power line of fixed width of said sampling processing circuit according to each fixed voltage phase place place in cycle; And carry out corresponding sampling processing, judge the data message of said transmission information representative.
10. the communication means based on low-voltage power line as claimed in claim 9 is characterized in that, said transport packet is drawn together synchronizing frame head, communication objective address, performance data and check code.
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Cited By (7)
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| CN104183111A (en) * | 2014-09-09 | 2014-12-03 | 华东交通大学 | Equipment communication system and equipment communication method of power distribution network |
| CN104662805A (en) * | 2012-09-28 | 2015-05-27 | 奥斯兰姆施尔凡尼亚公司 | Method and apparatus for a memory based packet compression encoding |
| CN104662806A (en) * | 2012-09-28 | 2015-05-27 | 奥斯兰姆施尔凡尼亚公司 | Transient power communication |
| CN106020023A (en) * | 2016-05-24 | 2016-10-12 | 朱永斌 | Online phase-modulation digital communication control system of local power utilization network |
| CN104662806B (en) * | 2012-09-28 | 2016-11-30 | 奥斯兰姆施尔凡尼亚公司 | A kind of power-supply system and the method for transient state power communication |
| CN112422155A (en) * | 2020-11-12 | 2021-02-26 | 上海蜂电网络科技有限公司 | Carrier wave cross-phase communication method and device |
| CN113411102A (en) * | 2021-06-24 | 2021-09-17 | 珠海格力电器股份有限公司 | Data transmission method, device and system |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104662805A (en) * | 2012-09-28 | 2015-05-27 | 奥斯兰姆施尔凡尼亚公司 | Method and apparatus for a memory based packet compression encoding |
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| CN104662806B (en) * | 2012-09-28 | 2016-11-30 | 奥斯兰姆施尔凡尼亚公司 | A kind of power-supply system and the method for transient state power communication |
| CN104183111A (en) * | 2014-09-09 | 2014-12-03 | 华东交通大学 | Equipment communication system and equipment communication method of power distribution network |
| CN106020023A (en) * | 2016-05-24 | 2016-10-12 | 朱永斌 | Online phase-modulation digital communication control system of local power utilization network |
| CN106020023B (en) * | 2016-05-24 | 2018-08-17 | 朱永斌 | A kind of online phase-modulation digital communication control system of local power utilization network |
| CN112422155A (en) * | 2020-11-12 | 2021-02-26 | 上海蜂电网络科技有限公司 | Carrier wave cross-phase communication method and device |
| CN112422155B (en) * | 2020-11-12 | 2021-11-09 | 上海蜂电网络科技有限公司 | Carrier wave cross-phase communication method and device |
| CN113411102A (en) * | 2021-06-24 | 2021-09-17 | 珠海格力电器股份有限公司 | Data transmission method, device and system |
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Application publication date: 20120509 |