CN104539316B - Communication method based on PLC, device and PLC networking system - Google Patents
Communication method based on PLC, device and PLC networking system Download PDFInfo
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- CN104539316B CN104539316B CN201410849877.8A CN201410849877A CN104539316B CN 104539316 B CN104539316 B CN 104539316B CN 201410849877 A CN201410849877 A CN 201410849877A CN 104539316 B CN104539316 B CN 104539316B
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Abstract
The embodiment of the invention provides a communication method based on a PLC, a device and a PLC networking system and relates to the field of communication. Alternating current power lines led out of an inverter do not need to be distinguished during communication, engineering installation is easy and convenient, and transmission reliability is high. The communication method comprises the steps that firstly, a set of modulating signals transmitted by a sending end via two of the N power lines are received, wherein the modulating signal set comprises two modulating signals, and the power lines corresponding to any two modulating signal sets are not identical; secondly, difference operation is carried out on one modulating signal set, a differential signal is obtained and demodulated, and a demodulating signal is obtained; the first step and the second step are executed for many times shown in the specification, and demodulating signals with the number shown in the specification are obtained; the first demodulating signal with the maximal signal strength in the demodulating signals serves as a demodulating source signal.
Description
Technical field
The present invention relates to the communications field, more particularly to it is a kind of based on PLC (Power Line Communication, electric power
Line communicates) communication means, equipment and PLC group network systems.
Background technology
PLC technology, i.e. transmitting terminal end obtain modulated signal after the source signal for needing transmission is carried out ac modulation, by handing over
Streamline cable (i.e. the electric wire of inverter output) sends modulated signal to receiving terminal, and receiving terminal receives modulated signal, to modulated signal
It is demodulated acquisition source signal.
Generally, inverter exports three alternating current line of forces.As shown in figure 1, for the schematic diagram of existing plc communication system,
The source signal for needing to send is modulated by transmitting terminal, transmits modulated signal to receiving terminal by A, the B in three electric lines of force,
Receiving terminal needs two modulated signals are received on corresponding A, B.Two modulated signals are carried out after calculus of differences, demodulation reduction
Go out source signal, be so achieved that transmitting terminal and the information of receiving terminal are exchanged.
In above-mentioned technical proposal, the electric lines of force for receiving modulated signal in receiving terminal must receive modulated signal with transmitting terminal
Electric lines of force correspondence, must strictly distinguish three alternating current line of forces of inverter output in receiving terminal.Otherwise, the communication at two ends will
Failure.Example, if as shown in figure 1, in work progress electric lines of force A, C occur intersect, receiving terminal mistake electric lines of force C is regarded
A carrys out the modulated signal of receiving end/sending end transmission, and as transmitting terminal is not through electric lines of force C transmission modulated signals, receiving terminal is in electricity
Modulated signal can not be received in line of force C, then can cause the Communications failure between transmitting terminal and receiving terminal.
The content of the invention
The embodiment of the present invention provides a kind of based on the communication means of PLC, equipment and PLC group network systems, and communication is without the need for distinguishing
The alternating current line of force of inverter output, project installation are easy, and transmission reliability is high.
To reach above-mentioned purpose, the technical scheme that the embodiment of the present invention is adopted is：
A kind of first aspect, there is provided communication means based on power line communication PLC, is applied to receiving terminal, the receiving terminal
N bar electric lines of force is provided between transmitting terminal, the transmitting terminal sends N number of tune to the receiving terminal by the N bars electric lines of force
Signal processed, one modulated signal of every power line transmission, N number of modulated signal is that the transmitting terminal is obtained according to same source signal
, the phase place of each modulated signal is identical with the phase place of the alternating current on the electric lines of force for transmitting the modulated signal, and the N is
Integer more than or equal to 3, methods described include：
The one group of modulated signal of A1, the reception transmitting terminal by two transmission in the N bars electric lines of force；Wherein, institute
Stating one group of modulated signal includes 2 modulated signals, and the corresponding electric lines of force of any two groups of modulated signals is incomplete same；
A2, calculus of differences is carried out to one group of modulated signal, obtain differential signal；The differential signal is solved
Adjust, obtain demodulated signal；
Perform the stepIt is secondary, obtainIndividual demodulated signal；
Will be describedIn individual demodulated signal, the first maximum demodulated signal of signal intensity is used as demodulation source signal.
With reference in a first aspect, in the first possible implementation of first aspect, methods described also includes：
In the first preset time period, according to the modulation letter transmitted on corresponding two electric lines of force of first demodulated signal
Number obtain demodulation source signal.
With reference to the first possible implementation of first aspect, in second possible implementation of first aspect
In, it is described concrete according to the modulated signal transmitted on corresponding two electric lines of force of first demodulated signal acquisition demodulation source signal
Including：
The modulated signal transmitted on two electric lines of force corresponding to first demodulated signal carries out calculus of differences, to difference
The signal obtained after computing is demodulated, using the signal after demodulation as demodulation source signal.
With reference to the first possible implementation of first aspect, in the third possible implementation of first aspect
In, methods described also includes：
At the end of first preset time period, the step is performedIt is secondary, obtainIndividual demodulated signal；
Wherein, the corresponding electric lines of force of any two groups of modulated signals is incomplete same；
Will be describedIn individual demodulated signal, the second maximum demodulated signal of signal intensity is used as demodulation source signal；
In the second preset time period, according to the modulation letter transmitted on corresponding two electric lines of force of second demodulated signal
Number obtain demodulation source signal.
With reference in a first aspect, in the 4th kind of possible implementation of first aspect, before step A1 is performed,
Methods described also includes:
Photovoltaic conversion is carried out to each in one group of modulated signal respectively.
With reference in a first aspect, in the 5th kind of possible implementation of first aspect, before step A2 is performed,
Methods described also includes:
Photovoltaic conversion is carried out to each in one group of modulated signal respectively.
Second aspect, a kind of communication means based on power line communication PLC is disclosed, be applied to transmitting terminal, the transmission
N bar electric lines of force is provided between end and receiving terminal, the N is the integer more than or equal to 3, methods described includes：
Ac modulation is carried out to source signal, respectively the phase adjustment ac modulation according to the alternating current on N bar electric lines of force
The signal for obtaining afterwards, obtains N number of modulated signal；
N number of modulated signal is transmitted to the receiving terminal by the N bars electric lines of force；Wherein, every power line transmission
The phase place phase of the alternating current on one modulated signal, the phase place of each modulated signal and the electric lines of force for transmitting the modulated signal
Together.
The third aspect, discloses a kind of equipment, is deployed in receiving terminal, N bars are provided between the receiving terminal and transmitting terminal
Electric lines of force, the transmitting terminal send N number of modulated signal, every power line transmission to the receiving terminal by the N bars electric lines of force
One modulated signal, N number of modulated signal are that the transmitting terminal is obtained according to same source signal, the phase of each modulated signal
Position is identical with the phase place of the alternating current on the electric lines of force for transmitting the modulated signal, and the N is the integer more than or equal to 3, including：
Switch control unit, for receiving one group tune of the transmitting terminal by two transmission in the N bars electric lines of force
Signal processed；Wherein, one group of modulated signal includes 2 modulated signals, and the corresponding electric lines of force of any two groups of modulated signals is not complete
It is exactly the same；
The signal demodulation unit is used for, and the one group of modulated signal received to the switch control unit is poor
Partite transport is calculated, and obtains differential signal；The differential signal is demodulated, demodulated signal is obtained；
The signal demodulation unit is additionally operable to, and obtains in the signal demodulation unitAfter individual demodulated signal, will be describedIn individual demodulated signal, the first maximum demodulated signal of signal intensity is used as demodulation source signal.
With reference to the third aspect, in the first possible implementation of the third aspect, the switch control unit is also used
In, in the first preset time period, being switched on corresponding two electric lines of force of first demodulated signal；
The signal demodulation unit is additionally operable to, in first preset time period, according to first demodulated signal pair
The modulated signal transmitted on two electric lines of force answered obtains demodulation source signal.
With reference to the first possible implementation of the third aspect, in the third possible implementation of the third aspect
In, the signal demodulation unit is specifically for the modulation letter transmitted on two electric lines of force corresponding to first demodulated signal
Number calculus of differences is carried out, the signal to obtaining after calculus of differences is demodulated, using the signal after demodulation as demodulation source signal.
With reference to the third aspect, in the third possible implementation of the third aspect, the switch control unit is also used
In, at the end of first preset time period, the reception transmitting terminal by two transmission in the N bars electric lines of force
Group modulated signal；Wherein, one group of modulated signal includes 2 modulated signals, the corresponding electric lines of force of any two groups of modulated signals
It is incomplete same；
The signal demodulation unit is used for, and the one group of modulated signal received to the switch control unit is poor
Partite transport is calculated, and obtains differential signal；The differential signal is demodulated, demodulated signal is obtained；
The signal demodulation unit is additionally operable to, and obtains in the signal demodulation unitAfter individual demodulated signal, will be describedIn individual demodulated signal, the 3rd maximum demodulated signal of signal intensity is used as demodulation source signal；
The switch control unit is additionally operable to, and in the 3rd preset time period, is switched to the 3rd demodulated signal correspondence
Two electric lines of force on；
The signal demodulation unit is additionally operable to, in the 3rd preset time period, according to the 3rd demodulated signal pair
The modulated signal transmitted on two electric lines of force answered obtains demodulation source signal.
With reference to the third aspect, in the 4th kind of possible implementation of the third aspect, also including photovoltaic conversion unit,
The photovoltaic conversion unit is used for, and receives the transmitting terminal in the switch control unit and passes through the N bars electric power
Before one group of modulated signal of two transmission in line, carry out voltage respectively to each in one group of modulated signal and turn
Change.
With reference to the third aspect, in the 5th kind of possible implementation of the third aspect, the photovoltaic conversion unit is used for,
Before one group of modulated signal that the signal demodulation unit is received to the switch control unit carries out calculus of differences,
Photovoltaic conversion is carried out to each in one group of modulated signal respectively.
Fourth aspect, discloses a kind of equipment, is deployed in transmitting terminal, and N bars electricity is provided between the transmitting terminal and receiving terminal
The line of force, the N are the integer more than or equal to 3, including：
Signal modulation unit, for carrying out ac modulation to source signal；Respectively according to the alternating current on N bar electric lines of force
The signal obtained after phase adjustment ac modulation, obtains N number of modulated signal；Passed to the receiving terminal by the N bars electric lines of force
Defeated N number of modulated signal；Wherein, one modulated signal of every power line transmission, phase place and the transmission of each modulated signal should
The phase place of the alternating current on the electric lines of force of modulated signal is identical.
In terms of 5th, a kind of PLC group network systems are disclosed, including：Receiving terminal, transmitting terminal, and it is arranged on the receiving terminal
With the N bar electric lines of force between the transmitting terminal, the transmitting terminal is by the N bars electric lines of force to the N number of tune of receiving terminal transmission
Signal processed, one modulated signal of every power line transmission, N number of modulated signal is that the transmitting terminal is obtained according to same source signal
, the phase place of each modulated signal is identical with the phase place of the alternating current on the electric lines of force for transmitting the modulated signal.
The receiving terminal is provided with the equipment described in the above-mentioned technical proposal third aspect；The transmitting terminal is provided with above-mentioned skill
Equipment described in art scheme fourth aspect.
The embodiment of the present invention provides a kind of based on the communication means of PLC, equipment and PLC group network systems, and transmitting terminal is believed to source
N number of modulated signal (each modulated signal one electric lines of force of correspondence) is obtained after number carrying out ac modulation, phase adjustment, by N bars
Electric lines of force sends N number of modulated signal to receiving terminal.Receiving terminal receives the transmitting terminal by two biographies in the N bars electric lines of force
One group of defeated modulated signal；Wherein, one group of modulated signal includes 2 modulated signals, and any two groups of modulated signals are corresponding
Electric lines of force is incomplete same.Calculus of differences is carried out to one group of modulated signal, differential signal is obtained；The differential signal is entered
Row demodulation, obtains demodulated signal.So, receiving terminal can be obtainedIndividual demodulated signal；Will be describedIn individual demodulated signal, signal is strong
The first maximum demodulated signal of degree is used as demodulation source signal.The electric lines of force that modulated signal is received in receiving terminal compared to existing technology must
Must be corresponding with the electric lines of force that transmitting terminal receives modulated signal, and then the N bars that must strictly distinguish inverter output in receiving terminal are handed over
Stream electric lines of force just can ensure that communication is normal.Method provided in an embodiment of the present invention, equipment and system, without distinguishing inverter output
Three alternating current line of forces, can still ensure the proper communication between transmitting terminal and receiving terminal.
Description of the drawings
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
Accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the schematic diagram of existing plc communication system；
Fig. 2 is the schematic flow sheet of the communication means based on PLC that the embodiment of the present invention 1 is provided；
Fig. 3 is the schematic flow sheet of the communication means based on PLC that the embodiment of the present invention 1 is provided；
Fig. 4 is the schematic diagram of the ac modulation that the embodiment of the present invention 1 is provided；
Fig. 5 is the structured flowchart that the present invention implements 2 equipment for providing；
Fig. 6 is another structured flowchart that the present invention implements 2 equipment for providing；
Fig. 7 is the structured flowchart that the present invention implements 3 equipment for providing；
Fig. 8 is the schematic diagram that the present invention implements the 4 PLC group network systems for providing；
Fig. 9 is the schematic diagram that the present invention implements the 5 PLC group network systems for providing.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than the embodiment of whole.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
Embodiment 1：
The embodiment of the present invention provides a kind of communication means based on PLC, and executive agent is receiving terminal, as shown in Fig. 2 described
Method is comprised the following steps：
101st, receive one group modulated signal of the transmitting terminal by two transmission in the N bars electric lines of force；Wherein, institute
Stating one group of modulated signal includes 2 modulated signals, and the corresponding electric lines of force of any two groups of modulated signals is incomplete same.
It should be noted that N bar electric lines of force is provided between the receiving terminal and transmitting terminal, the transmitting terminal is by described
N bars electric lines of force sends N number of modulated signal, one modulated signal of every power line transmission, N number of modulation letter to the receiving terminal
Number it is that the transmitting terminal is obtained according to same source signal, the phase place of each modulated signal and the electric lines of force for transmitting the modulated signal
On alternating current phase place it is identical, the N is the integer more than or equal to 3.Each frequency modulating signal is identical, amplitude is identical, phase
Position is different.
102nd, calculus of differences is carried out to one group of modulated signal, differential signal is obtained；The differential signal is solved
Adjust, obtain demodulated signal.
Specifically, two signals are carried out after calculus of differences, obtaining a signal, thus it is poor to one group of signal here
Partite transport is calculated, it is possible to obtain a demodulated signal.
103rd, perform the step 101,It is secondary, obtainIndividual demodulated signal.
Here, as N bar electric lines of force is provided between receiving terminal and transmitting terminal, receiving terminal selects wherein any two conducts
The passage of signal is received, in N selecting 2 hasMay, accordingly, it would be desirable to carry out step 101,It is secondary, so, will
ObtainIndividual modulated signal.
104th, will be describedIn individual demodulated signal, the first maximum demodulated signal of signal intensity is used as demodulation source signal.
It is in implementing, rightIndividual demodulated signal carries out signal strength analysis, afterwards, by thisBelieve in individual demodulated signal
The demodulated signal of number maximum intensity is designated as the first demodulated signal, using first demodulated signal as demodulation source signal, that is, receives
The source signal that the demodulation source signal can be sent by end as transmitting terminal, and the demodulation source signal is processed, obtain information.
Preferably, in a preferred embodiment of the invention, in the first preset time period, according to first demodulated signal
The modulated signal transmitted on corresponding two electric lines of force obtains demodulation source signal.
Preferably, in a preferred embodiment of the invention, it is described according to corresponding two electric power of first demodulated signal
The modulated signal transmitted on line obtains demodulation source signal and specifically includes：
The modulated signal transmitted on two electric lines of force corresponding to first demodulated signal carries out calculus of differences, to difference
The signal obtained after computing is demodulated, using the signal after demodulation as demodulation source signal.
Preferably, in a preferred embodiment of the invention, at the end of first preset time period, perform the stepIt is secondary, obtainIndividual demodulated signal；Wherein, the corresponding electric lines of force of any two groups of modulated signals is incomplete same；
Will be describedIn individual demodulated signal, the second maximum demodulated signal of signal intensity is used as demodulation source signal；
In the second preset time period, according to the modulation letter transmitted on corresponding two electric lines of force of second demodulated signal
Number obtain demodulation source signal.
Preferably, in a preferred embodiment of the invention, before the step 101 is performed, methods described also includes:
Photovoltaic conversion is carried out to each in one group of modulated signal respectively.
Preferably, in a preferred embodiment of the invention, before the step 102 is performed, methods described also includes:
Photovoltaic conversion is carried out to each in one group of modulated signal respectively.
The embodiment of the present invention provides a kind of communication means based on PLC, and transmitting terminal end carries out ac modulation, phase to source signal
N number of modulated signal (each modulated signal one electric lines of force of correspondence) is obtained after the adjustment of position, is sent to receiving terminal by N bars electric lines of force
N number of modulated signal.Transmitting terminal receives one group modulated signal of the transmitting terminal by two transmission in the N bars electric lines of force；
Wherein, one group of modulated signal includes 2 modulated signals, and the corresponding electric lines of force of any two groups of modulated signals is incomplete same.
Calculus of differences is carried out to one group of modulated signal, differential signal is obtained；The differential signal is demodulated, demodulation letter is obtained
Number.So, receiving terminal can be obtainedIndividual demodulated signal；Will be describedThe first maximum demodulation of signal intensity in individual demodulated signal
Signal is used as demodulation source signal.The electric lines of force that modulated signal is received in receiving terminal compared to existing technology must be received with transmitting terminal to be adjusted
The electric lines of force of signal processed is corresponding, and then the N bar alternating current line of forces that must strictly distinguish inverter output in receiving terminal can just guarantee
Communication is normal.Method provided in an embodiment of the present invention, without three alternating current line of forces for distinguishing inverter output, can still ensure to send out
Proper communication between sending end and receiving terminal.
The embodiment of the present invention also provides a kind of communication means based on PLC, and executive agent is transmitting terminal, as shown in figure 3, institute
The method of stating is comprised the following steps：
201st, ac modulation is carried out to source signal, is exchanged according to the phase adjustment of the alternating current on N bar electric lines of force respectively
The signal obtained after modulation, obtains N number of modulated signal.
In implementing, ac modulation schematic diagram as shown in figure 4, wherein (a) is the alternating current of standard 50/60Hz (b) is
Source signal, is (c) signal after ac modulation.Phase adjustment ac modulation according to the alternating current on N bar electric lines of force respectively
The signal for obtaining afterwards, obtains N number of modulated signal, can be specifically that the signal after ac modulation is coupled on N bar electric lines of force,
So that the phase place of the modulated signal transmitted on every electric lines of force is identical with the phase place of the alternating current on the electric lines of force.Due to N bars electricity
Alternating current amplitude in the line of force is identical, and frequency is identical, and phase place is different, therefore, N number of modulated signal is also that amplitude is identical, frequency phase
Together, phase place is different.
202nd, N number of modulated signal is transmitted to the receiving terminal by the N bars electric lines of force；Wherein, every electric lines of force
The phase place of the alternating current on one modulated signal of transmission, the phase place of each modulated signal and the electric lines of force for transmitting the modulated signal
It is identical.
The embodiment of the present invention provides a kind of communication means based on PLC, and transmitting terminal carries out ac modulation, phase place to source signal
N number of modulated signal (each modulated signal one electric lines of force of correspondence) is obtained after adjustment, N is sent to receiving terminal by N bars electric lines of force
Individual modulated signal.Think that receiving terminal send modulated signal using two electric lines of force in transmitting terminal compared to existing technology, when wherein one
When physical fault occurs in electric lines of force, cause the communication failure between receiving terminal and transmitting terminal.Method provided in an embodiment of the present invention,
Transmitting terminal transmits modulated signal to receiving terminal by the N bars electric lines of force between receiving terminal, breaks down when wherein there is electric lines of force
When, receiving terminal still can receive modulated signal on remaining electric lines of force, and then demodulate source signal.
Embodiment 2：
The embodiment of the present invention provides a kind of equipment 30, is deployed in receiving terminal, as shown in figure 5, equipment 30 includes：Switching control
Unit 301, signal demodulation unit 302.
It should be noted that N bar electric lines of force is provided between the receiving terminal and transmitting terminal, the transmitting terminal is by described
N bars electric lines of force sends N number of modulated signal, one modulated signal of every power line transmission, N number of modulation letter to the receiving terminal
Number it is that the transmitting terminal is obtained according to same source signal, the phase place of each modulated signal and the electric lines of force for transmitting the modulated signal
On alternating current phase place it is identical, the N is the integer more than or equal to 3.
Switch control unit 301, for receiving one group by two transmission in the N bars electric lines of force of the transmitting terminal
Modulated signal；Wherein, one group of modulated signal includes 2 modulated signals, and the corresponding electric lines of force of any two groups of modulated signals is not
It is identical.
Signal demodulation unit 302 is used for, and the one group of modulated signal received to the switch control unit 301 is carried out
Calculus of differences, obtains differential signal；The differential signal is demodulated, demodulated signal is obtained.
The signal demodulation unit 302 is additionally operable to, and obtains in the signal demodulation unitAfter individual demodulated signal, will
It is describedIn individual demodulated signal, the first maximum demodulated signal of signal intensity is used as demodulation source signal.
The switch control unit 301 is additionally operable to, and in the first preset time period, is switched to first demodulated signal pair
On two electric lines of force answered；The signal demodulation unit 302 is additionally operable to, in first preset time period, according to described
The modulated signal transmitted on corresponding two electric lines of force of one demodulated signal obtains demodulation source signal.
The signal demodulation unit 302 is specifically for transmitting on two electric lines of force corresponding to first demodulated signal
Modulated signal carry out calculus of differences, the signal to obtaining after calculus of differences is demodulated, using the signal after demodulation as demodulation
Source signal.
The switch control unit 301 is additionally operable to, and at the end of first preset time period, receives the transmitting terminal and leads to
One group of modulated signal of two transmission crossed in the N bars electric lines of force；Wherein, one group of modulated signal includes 2 modulation letters
Number, the corresponding electric lines of force of any two groups of modulated signals is incomplete same.
The signal demodulation unit 302 is used for, and the one group of modulated signal received to the switch control unit is entered
Row calculus of differences, obtains differential signal；The differential signal is demodulated, demodulated signal is obtained.
The signal demodulation unit 302 is additionally operable to, and obtains in the signal demodulation unitAfter individual demodulated signal, by institute
StateIn individual demodulated signal, the second maximum demodulated signal of signal intensity is used as demodulation source signal.
The switch control unit 301 is additionally operable to, and in the second preset time period, is switched to second demodulated signal pair
On two electric lines of force answered.
The signal demodulation unit 301 is additionally operable to, in second preset time period, according to second demodulated signal
The modulated signal transmitted on corresponding two electric lines of force obtains demodulation source signal.
As shown in fig. 6, the equipment 30 also includes photovoltaic conversion unit 303,
The photovoltaic conversion unit 303 is used for, and receives the transmitting terminal by N bars electricity in the switch control unit
Before one group of modulated signal of two transmission in the line of force, carry out voltage respectively to each in one group of modulated signal and turn
Change.
The photovoltaic conversion unit 303 is used for, and the switch control unit is received in the signal demodulation unit
Before one group of modulated signal carries out calculus of differences, carry out voltage respectively to each in one group of modulated signal and turn
Change.
Equipment provided in an embodiment of the present invention, receives the transmitting terminal by two transmission in the N bars electric lines of force
One group of modulated signal；Wherein, one group of modulated signal includes 2 modulated signals, the corresponding electric power of any two groups of modulated signals
Line is incomplete same.Calculus of differences is carried out to one group of modulated signal, differential signal is obtained；The differential signal is solved
Adjust, obtain demodulated signal.So, receiving terminal can be obtainedIndividual demodulated signal；Will be describedIn individual demodulated signal, signal intensity is most
The first big demodulated signal is used as demodulation source signal.Compared to existing technology receiving terminal receive modulated signal electric lines of force must and
Transmitting terminal receives the electric lines of force correspondence of modulated signal, and then the N bar alternating currents of inverter output must be strictly distinguished in receiving terminal
The line of force just can ensure that communication is normal.Equipment provided in an embodiment of the present invention, without three alternating electromotive forces for distinguishing inverter output
Line, can still ensure the proper communication between transmitting terminal and receiving terminal.
Embodiment 3：
The embodiment of the present invention provides a kind of equipment 40, is deployed in transmitting terminal, as shown in fig. 7, equipment 40 includes：Signal modulation
Unit 401.
It should be noted that N bar electric lines of force is provided between the transmitting terminal and receiving terminal, the N is more than or equal to 3
Integer.
Signal modulation unit 401, for carrying out ac modulation to source signal；Respectively according to the alternating current on N bar electric lines of force
The signal obtained after the phase adjustment ac modulation of stream, obtains N number of modulated signal；By the N bars electric lines of force to the reception
End transmission N number of modulated signal；Wherein, one modulated signal of every power line transmission, phase place and the biography of each modulated signal
The phase place of the alternating current on the electric lines of force of the defeated modulated signal is identical.
Equipment provided in an embodiment of the present invention, obtains N number of modulated signal after carrying out ac modulation, phase adjustment to source signal
(each modulated signal one electric lines of force of correspondence), sends N number of modulated signal to receiving terminal by N bars electric lines of force.Compare existing skill
Using two electric lines of force, art thinks that receiving terminal sends modulated signal in transmitting terminal, when there is physical fault in wherein one electric lines of force,
Cause the communication failure between receiving terminal and transmitting terminal.Equipment provided in an embodiment of the present invention, transmitting terminal by with receiving terminal it
Between N bars electric lines of force to receiving terminal transmit modulated signal, when wherein there is electric lines of force to break down, receiving terminal still can remaining electricity
Modulated signal is received in the line of force, and then demodulates source signal.
Embodiment 4：
The embodiment of the present invention provides a kind of PLC group network systems, as shown in figure 8, including：Transmitting terminal 50, receiving terminal 60, and
The N bar electric lines of force being arranged between the receiving terminal and the transmitting terminal.
It should be noted that N bar electric lines of force is provided between the receiving terminal and transmitting terminal, the transmitting terminal is by described
N bars electric lines of force sends N number of modulated signal, one modulated signal of every power line transmission, N number of modulation letter to the receiving terminal
Number it is that the transmitting terminal is obtained according to same source signal, the phase place of each modulated signal and the electric lines of force for transmitting the modulated signal
On alternating current phase place it is identical, the N is the integer more than or equal to 3.The present embodiment introduces the PLC groups by taking N=3 as an example
In net system, transmitting terminal 50 is to flow process the step of 60 transmission signal of receiving terminal.
As shown in figure 8, transmitting terminal 50 includes：Signal modulator 501, bonder 502, bonder 503, bonder 504.
The signal modulator 501 is used for, for carrying out ac modulation to source signal；
Bonder 502 is used for, according to the signal obtained after the phase adjustment ac modulation of the alternating current on electric lines of force A,
Obtain 1 modulated signal；Bonder 503 is used for, and obtains according to after the phase adjustment ac modulation of the alternating current on electric lines of force B
Signal, obtain 1 modulated signal；Bonder 503 is used for, and is adjusted according to the exchange of the phase adjustment of the alternating current on electric lines of force C
The signal obtained after system, obtains 1 modulated signal.
The signal modulator 501 is additionally operable to, and is passed to the receiving terminal by 3 electric lines of force (electric lines of force A, B, C)
Defeated 3 modulated signals；Wherein, one modulated signal of every power line transmission, phase place and the transmission of each modulated signal should
The phase place of the alternating current on the electric lines of force of modulated signal is identical.
It should be noted that the function of signal modulator 501, bonder 502, bonder 503, bonder 504 can be by
The signal modulation unit 401 of the said equipment 40 is realizing.
As shown in figure 8, receiving terminal 60 includes switch control unit 601, demodulator of PM signal PM 602, bonder 603, bonder
604 and bonder 605.In implementing, switch control unit 601 can be by channel selection unit 6011, control unit
6012 compositions, channel selection unit 6011 can include one group of switch, and control unit 6012 is for two in controlling switch group
Conducting.
Bonder 603, bonder 604 and bonder 605 are used to the modulated signal to transmitting on electric lines of force and carry out electricity
Pressure conversion.
Switch control unit 601, for receiving one group by two transmission in 3 electric lines of force of the transmitting terminal
Modulated signal；Wherein, one group of modulated signal includes 2 modulated signals, and the corresponding electric lines of force of any two groups of modulated signals is not
It is identical.
Signal demodulation unit 602 is used for, and the one group of modulated signal received to the switch control unit 601 is carried out
Calculus of differences, obtains differential signal；The differential signal is demodulated, demodulated signal is obtained.
The signal demodulation unit 602 is additionally operable to, and obtains 3 (i.e. in the signal demodulation unitN=3) individual demodulation letter
Number afterwards, using the first maximum demodulated signal of signal intensity in 3 demodulated signals as demodulation source signal.
PLC group network systems provided in an embodiment of the present invention, transmitting terminal are obtained after carrying out ac modulation, phase adjustment to source signal
N number of modulated signal (each modulated signal one electric lines of force of correspondence) is obtained, N number of modulation letter is sent to receiving terminal by N bars electric lines of force
Number.Receiving terminal receives one group modulated signal of the transmitting terminal by two transmission in the N bars electric lines of force；Wherein, it is described
One group of modulated signal includes 2 modulated signals, and the corresponding electric lines of force of any two groups of modulated signals is incomplete same.To described one group
Modulated signal carries out calculus of differences, obtains differential signal；The differential signal is demodulated, demodulated signal is obtained.So, connect
Receiving end can be obtainedIndividual demodulated signal；Will be describedIn individual demodulated signal, the first maximum demodulated signal of signal intensity is used as solution
Adjust source signal.The electric lines of force that modulated signal is received in receiving terminal compared to existing technology must receive the electricity of modulated signal with transmitting terminal
Line of force correspondence, and then the N bar alternating currents line of force that must strictly distinguish inverter output in receiving terminal can just guarantee that communication is normal.This
Method, equipment and system that inventive embodiments are provided, without three alternating current line of forces for distinguishing inverter output, can still ensure to send out
Proper communication between sending end and receiving terminal.
Embodiment 5：
The embodiment of the present invention provides a kind of PLC group network systems, as shown in figure 9, including：Transmitting terminal 50, receiving terminal 60, and
The N bar electric lines of force being arranged between the receiving terminal and the transmitting terminal.
Unlike the PLC group network systems provided from embodiment 3, receiving terminal 60 includes switch control unit 601, signal solution
Adjust device 602, bonder 606, bonder 607.
Bonder 606, bonder 607 are for described in receiving to the switch control unit 601 in demodulator of PM signal PM
Before one group of modulated signal carries out calculus of differences, photovoltaic conversion is carried out to modulated signal.
PLC group network systems provided in an embodiment of the present invention, transmitting terminal are obtained after carrying out ac modulation, phase adjustment to source signal
N number of modulated signal (each modulated signal one electric lines of force of correspondence) is obtained, N number of modulation letter is sent to receiving terminal by N bars electric lines of force
Number.Receiving terminal receives one group modulated signal of the transmitting terminal by two transmission in the N bars electric lines of force；Wherein, it is described
One group of modulated signal includes 2 modulated signals, and the corresponding electric lines of force of any two groups of modulated signals is incomplete same.To described one group
Modulated signal carries out calculus of differences, obtains differential signal；The differential signal is demodulated, demodulated signal is obtained.So, connect
Receiving end can be obtainedIndividual demodulated signal；Will be describedIn individual demodulated signal, the first maximum demodulated signal of signal intensity is used as solution
Adjust source signal.The electric lines of force that modulated signal is received in receiving terminal compared to existing technology must receive the electricity of modulated signal with transmitting terminal
Line of force correspondence, and then the N bar alternating currents line of force that must strictly distinguish inverter output in receiving terminal can just guarantee that communication is normal.This
Method, equipment and system that inventive embodiments are provided, without three alternating current line of forces for distinguishing inverter output, can still ensure to send out
Proper communication between sending end and receiving terminal.
Claims (13)
1. a kind of communication means based on power line communication PLC, is applied to receiving terminal, arranges between the receiving terminal and transmitting terminal
There is N bar electric lines of force, the transmitting terminal sends N number of modulated signal, every bar electric lines of force to the receiving terminal by the N bars electric lines of force
One modulated signal of transmission, N number of modulated signal is that the transmitting terminal is obtained according to same source signal, each modulated signal
Phase place with transmit the modulated signal electric lines of force on alternating current phase place it is identical, the N is the integer more than or equal to 3,
Characterized in that, methods described includes：
The one group of modulated signal of A1, the reception transmitting terminal by two transmission in the N bars electric lines of force；Wherein, described one
Group modulated signal includes 2 modulated signals, and the corresponding electric lines of force of any two groups of modulated signals is incomplete same；
A2, calculus of differences is carried out to one group of modulated signal, obtain differential signal；The differential signal is demodulated, is obtained
Obtain demodulated signal；
Perform step A1-A2It is secondary, obtainIndividual demodulated signal；
Will be describedIn individual demodulated signal, the first maximum demodulated signal of signal intensity is used as demodulation source signal.
2. method according to claim 1, it is characterised in that methods described also includes：
In the first preset time period, obtained according to the modulated signal transmitted on corresponding two electric lines of force of first demodulated signal
Take demodulation source signal.
3. method according to claim 2, it is characterised in that it is described according to first demodulated signal it is corresponding two it is electric
The modulated signal transmitted in the line of force obtains demodulation source signal and specifically includes：
The modulated signal transmitted on two electric lines of force corresponding to first demodulated signal carries out calculus of differences, to calculus of differences
The signal for obtaining afterwards is demodulated, using the signal after demodulation as demodulation source signal.
4. method according to claim 2, it is characterised in that methods described also includes：
At the end of first preset time period, step A1-A2 is performedIt is secondary, obtainIndividual demodulated signal；Wherein,
The corresponding electric lines of force of any two groups of modulated signals is incomplete same；
Will be describedIn individual demodulated signal, the second maximum demodulated signal of signal intensity is used as demodulation source signal；
In the second preset time period, obtained according to the modulated signal transmitted on corresponding two electric lines of force of second demodulated signal
Take demodulation source signal.
5. method according to claim 1, it is characterised in that before step A1 is performed, methods described also includes:
Photovoltaic conversion is carried out to each in one group of modulated signal respectively.
6. method according to claim 1, it is characterised in that before step A2 is performed, methods described also includes:
Photovoltaic conversion is carried out to each in one group of modulated signal respectively.
7. a kind of equipment, is deployed in receiving terminal, and N bar electric lines of force, the transmitting terminal are provided between the receiving terminal and transmitting terminal
N number of modulated signal, one modulated signal of every power line transmission, the N are sent to the receiving terminal by the N bars electric lines of force
Individual modulated signal is that the transmitting terminal is obtained according to same source signal, phase place and the transmission modulated signal of each modulated signal
Electric lines of force on alternating current phase place it is identical, the N is the integer more than or equal to 3, it is characterised in that included：
Switch control unit, for receiving one group modulation letter of the transmitting terminal by two transmission in the N bars electric lines of force
Number；Wherein, one group of modulated signal includes 2 modulated signals, the incomplete phase of the corresponding electric lines of force of any two groups of modulated signals
Together；
Signal demodulation unit is used for, and the one group of modulated signal received to the switch control unit carries out calculus of differences,
Obtain differential signal；The differential signal is demodulated, demodulated signal is obtained；
The signal demodulation unit is additionally operable to, and obtains in the signal demodulation unitAfter individual demodulated signal, will be describedIt is individual
In demodulated signal, maximum the first demodulated signal of signal intensity is used as demodulation source signal.
8. equipment according to claim 7, it is characterised in that the switch control unit is additionally operable to, when first is default
Between in section, be switched on corresponding two electric lines of force of first demodulated signal；
The signal demodulation unit is additionally operable to, in first preset time period, corresponding according to first demodulated signal
The modulated signal transmitted on two electric lines of force obtains demodulation source signal.
9. equipment according to claim 8, it is characterised in that the signal demodulation unit is specifically for described first
The modulated signal transmitted on corresponding two electric lines of force of demodulated signal carries out calculus of differences, and the signal to obtaining after calculus of differences enters
Row demodulation, using the signal after demodulation as demodulation source signal.
10. equipment according to claim 7, it is characterised in that
The switch control unit is additionally operable to, and at the end of the first preset time period, receives the transmitting terminal by N bars electricity
One group of modulated signal of two transmission in the line of force；Wherein, one group of modulated signal includes 2 modulated signals, any two groups
The corresponding electric lines of force of modulated signal is incomplete same；
The signal demodulation unit is used for, and the one group of modulated signal received to the switch control unit carries out difference fortune
Calculate, obtain differential signal；The differential signal is demodulated, demodulated signal is obtained；
The signal demodulation unit is additionally operable to, and obtains in the signal demodulation unitAfter individual demodulated signal, will be describedIt is individual
In demodulated signal, maximum the second demodulated signal of signal intensity is used as demodulation source signal；
The switch control unit is additionally operable to, and in the second preset time period, is switched to second demodulated signal corresponding two
On bar electric lines of force；
The signal demodulation unit is additionally operable to, in second preset time period, corresponding according to second demodulated signal
The modulated signal transmitted on two electric lines of force obtains demodulation source signal.
11. equipment according to claim 7, it is characterised in that also including photovoltaic conversion unit, the photovoltaic conversion unit
For receiving one group modulation of the transmitting terminal by two transmission in the N bars electric lines of force in the switch control unit
Before signal, photovoltaic conversion is carried out to each in one group of modulated signal respectively.
12. equipment according to claim 7, it is characterised in that
Photovoltaic conversion unit is used for, in one group of modulation that the signal demodulation unit is received to the switch control unit
Before signal carries out calculus of differences, photovoltaic conversion is carried out to each in one group of modulated signal respectively.
13. a kind of PLC group network systems, it is characterised in that include：Receiving terminal, transmitting terminal, and it is arranged on the receiving terminal and institute
The N bar electric lines of force between transmitting terminal is stated, the N is the integer more than or equal to 3,
Wherein, the transmitting terminal sends N number of modulated signal to the receiving terminal by the N bars electric lines of force, and every electric lines of force is passed
A defeated modulated signal, N number of modulated signal are that the transmitting terminal is obtained according to same source signal, each modulated signal
Phase place is identical with the phase place of the alternating current on the electric lines of force for transmitting the modulated signal；
The receiving terminal is provided with the equipment described in any one of claim 7-12.
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| CN201410849877.8A CN104539316B (en) | 2014-12-31 | 2014-12-31 | Communication method based on PLC, device and PLC networking system |
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| JP6759879B2 (en) * | 2016-09-02 | 2020-09-23 | 富士ゼロックス株式会社 | Signal transmission device and image forming device |
| CN108882357B (en) * | 2018-06-06 | 2021-06-22 | 成都精位科技有限公司 | Positioning device, method and system based on power line carrier communication |
| CN112753168B (en) * | 2018-09-25 | 2021-12-28 | 华为技术有限公司 | PLC control method and device |
| CN110798246B (en) * | 2019-09-29 | 2022-02-25 | 华为数字能源技术有限公司 | Interface circuit, group string and system applied to power line communication |
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| CN2788202Y (en) * | 2005-02-05 | 2006-06-14 | 李建岐 | Electric power line phase searcher |
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| KR20070064881A (en) * | 2005-12-19 | 2007-06-22 | 삼성전자주식회사 | Apparatus for adjusting phase between the different phases in power line communication system |
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| CN1156353A (en) * | 1996-02-02 | 1997-08-06 | 海南航空旅业开发股份有限公司 | Carrier synchrous communication technology |
| CN2788202Y (en) * | 2005-02-05 | 2006-06-14 | 李建岐 | Electric power line phase searcher |
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