CN106230482A - Power-line carrier communication method and system - Google Patents
Power-line carrier communication method and system Download PDFInfo
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- CN106230482A CN106230482A CN201610742968.0A CN201610742968A CN106230482A CN 106230482 A CN106230482 A CN 106230482A CN 201610742968 A CN201610742968 A CN 201610742968A CN 106230482 A CN106230482 A CN 106230482A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
- H04B3/544—Setting up communications; Call and signalling arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
- H04B3/56—Circuits for coupling, blocking, or by-passing of signals
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Abstract
The invention discloses a kind of power-line carrier communication method and system.Wherein, the method includes: when power frequency zero cross signal being detected, generates the pulse-modulated signal of predeterminated frequency;Use pulse-modulated signal that primary carrier signal is modulated, so that the carrier signal after modulation is coupled to the high pressure power frequency electric line of force by signal coupling circuit;Carrier signal after modulation is demodulated by the same power frequency zero crossing corresponding at power frequency zero cross signal;Wherein, the carrier signal after modulation is coupled from the high pressure power frequency electric line of force by signal coupling circuit and obtains.The present invention solves the technical problem that signal attenuation is big, reliability is low of power line carrier, PLC of the prior art.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of power-line carrier communication method and system.
Background technology
At present, low-voltage powerline carrier communication (PLC, Power are broadly fallen into power distribution power line for the communication that carrier realizes
Line Communication), it is meant that: by information " carries " mesh reaching transmission information (communication) on electric lines of force
's.
All design transmitting AC energy (usually 50Hz) due to the relevant equipment on electric lines of force and power distribution network, and
Be not suitable for transmission frequency and be significantly larger than the common PLC signal of power frequency, as the communication of transmission medium, in the situation that frequency is the highest
The decay of lower signal is the most serious, and transmission reliability is the lowest.Therefore, the most logical if using traditional power line carrier communication to realize
Letter, it is necessary to could realize telecommunication through repeatedly relaying, multirouting repeatedly relays and is necessarily substantially reduced the reliable of signal transmission
Property, and when there being capacitive load on circuit, carrier signal can be constituted bigger decay.
For the problem that signal attenuation is big, reliability is low of power line carrier, PLC of the prior art, the most not yet propose
Effective solution.
Summary of the invention
Embodiments provide a kind of power-line carrier communication method and system, of the prior art at least to solve
The technical problem that the signal attenuation of power line carrier, PLC is big, reliability is low.
An aspect according to embodiments of the present invention, it is provided that a kind of power-line carrier communication method, including: when detecting
During power frequency zero cross signal, generate the pulse-modulated signal of predeterminated frequency;Use pulse-modulated signal that primary carrier signal is adjusted
System, so that the carrier signal after modulation is coupled to the high pressure power frequency electric line of force by signal coupling circuit;Corresponding at power frequency zero cross signal
Same power frequency zero crossing to modulation after carrier signal be demodulated;Wherein, the carrier signal after modulation passes through signal coupling
Conjunction circuit couples from the high pressure power frequency electric line of force and obtains.
Further, the carrier signal after modulation is coupled to the described high pressure power frequency electric line of force by described coupling circuit.
Further, being filtered described carrier signal processing, wherein, described Filtering Processing includes: active power filtering, nothing
Source filtering and signal amplify.
Further, by analog-to-digital conversion device, the carrier signal being filtered after processing is sampled;Sampling is obtained
Carrier signal carry out digital filtering and fast Fourier transform, so that described carrier signal is demodulated, obtain described former
Carrier signal.
Further, predeterminated frequency is 2.6KHz.
Another aspect according to embodiments of the present invention, additionally provides a kind of power-line carrier communication system, including: power frequency mistake
Zero testing circuit, is used for carrying out power frequency zero passage detection, generates power frequency zero cross signal;Signal coupling circuit, respectively with processor and
The high pressure power frequency electric line of force is connected, for the carrier signal that processor is modulated being coupled to the high pressure power frequency electric line of force of transmitting terminal, and
The carrier signal that the high pressure power frequency electric line of force is transmitted is coupled to processor;Processor, is connected with power frequency zero cross detection circuit, is used for
When the power frequency zero cross signal that power frequency zero cross detection circuit provides being detected, generate the pulse-modulated signal of predeterminated frequency to publishing originally
Ripple signal is modulated, and at the same power frequency zero crossing that described power frequency zero cross signal is corresponding, signal coupling circuit is coupled
Carrier signal after modulation is demodulated.
Further, power frequency zero cross detection circuit includes: diode, is connected with the high pressure power frequency electric line of force, at high pressure
Alternating current in the power frequency electric line of force be on the occasion of time conducting;Optocoupler, is connected with diode, for making in the case of diode current flow
Power supply and ground conducting;Power supply, is connected with described optocoupler;Outfan, right for exporting in the case of described power supply with ground conducting
The signal answered, is otherwise output as zero;Wherein, power frequency zero cross signal be described outfan output signal jump vanishing time letter
Number.
Further, optocoupler includes: light emitting diode, and the positive pole of light emitting diode is connected with the negative pole of diode, negative pole
It is connected with the positive pole of diode, is same as in the case of diode current flow turning on;Phototriode, the emitter stage of phototriode
Ground connection, colelctor electrode is connected with outfan, for turning in the case of LEDs ON;Wherein, power supply is connected to photosensitive
The colelctor electrode of audion.
Further, power frequency zero cross detection circuit also includes: the first divider resistance, is connected to negative pole and the high pressure of diode
Between the power frequency electric line of force, carry out dividing potential drop for the power supply that the high pressure power frequency electric line of force is provided;Second divider resistance, is connected to power supply
And between the colelctor electrode of phototriode;3rd divider resistance, is connected between the second divider resistance and outfan, for and the
Two divider resistances carry out dividing potential drop to power supply.
Further, signal coupling circuit includes: coupling transformer, and the two ends of the first winding of coupling transformer are connected to
The high pressure power frequency electric line of force, the two ends of the second winding are connected to processor;Capacitor and resistance, be connected to coupling transformer and high pressure
Between the power frequency electric line of force, for carrier signal is filtered.
Further, signal coupling circuit is additionally operable to carry out power frequency high voltage isolation.
Further, system also includes: filter circuit, including passive filtering unit, active power filtering unit and amplifying unit,
It is sequentially connected between signal coupling circuit and processor, coupled to the carrier signal of processor for filtering signal coupling circuit
In preset the noise beyond carrier frequency, and amplify carrier signal.
Further, processor includes: modulating unit, believes primary carrier for generating the pulse-modulated signal of predeterminated frequency
Number it is modulated;Demodulating unit, is connected with signal coupling circuit, for solving the carrier signal of signal coupling circuit coupling
Adjust.
Further, demodulating unit includes: analog digital conversion subelement, is connected with filter circuit, for filtered carrier wave
Signal carries out analog digital conversion;Data filtering subelement, is connected with analog digital conversion subelement, for digital carrier signal number
Word filters;Fast Fourier transform subelement, is connected with data filtering subelement, for according to filtered digital carrier signal
Demodulate CF signal;Decoding subelement, is connected with fast Fourier transform subelement, former for decoding according to CF signal
Carrier signal.
Further, predeterminated frequency is 2.6KHz.
In embodiments of the present invention, the application above-mentioned steps, when the first power frequency zero cross signal being detected, generates and presets frequency
The pulse-modulated signal of rate, uses pulse-modulated signal to be modulated primary carrier signal, so that signal coupling circuit will modulation
After carrier signal coupled to the high pressure power frequency electric line of force, receive the carrier wave that signal coupling circuit couples from the high pressure power frequency electric line of force
Signal, when the second power frequency zero cross signal being detected, is demodulated carrier signal.Such scheme is by using predeterminated frequency
Carrier signal, owing to the carrier signal of predeterminated frequency can be less than the carrier signal of hundreds of KHz in prior art, and
During power frequency zero crossing, carrier signal is modulated, to coupled in the high pressure power frequency electric line of force, thus avoids owing to carrier wave is believed
Number the bigger decay to carrier signal of the high pressure power frequency electric line of force caused by frequency height, ensure that transmission farther out simultaneously
Distance (not less than 2.5 kms), solves the technology that signal attenuation is big, reliability is low of power line carrier, PLC of the prior art
Problem.
Accompanying drawing explanation
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the application, this
Bright schematic description and description is used for explaining the present invention, is not intended that inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the flow chart of a kind of optional power-line carrier communication method according to embodiments of the present invention;
Fig. 2 is the structural representation of a kind of power-line carrier communication system according to the embodiment of the present application;
Fig. 3 is a kind of optional power frequency zero cross detection circuit according to the embodiment of the present application;
Fig. 4 is the schematic diagram of a kind of optional coupling circuit according to the embodiment of the present application;
Fig. 5 is the structure chart of a kind of optional filter circuit according to the embodiment of the present application;And
Fig. 6 is the structural representation of a kind of optional demodulating unit according to the embodiment of the present application.
Detailed description of the invention
In order to make those skilled in the art be more fully understood that the present invention program, below in conjunction with in the embodiment of the present invention
Accompanying drawing, is clearly and completely described the technical scheme in the embodiment of the present invention, it is clear that described embodiment is only
The embodiment of a present invention part rather than whole embodiments.Based on the embodiment in the present invention, ordinary skill people
The every other embodiment that member is obtained under not making creative work premise, all should belong to the model of present invention protection
Enclose.
It should be noted that term " first " in description and claims of this specification and above-mentioned accompanying drawing, "
Two " it is etc. for distinguishing similar object, without being used for describing specific order or precedence.Should be appreciated that so use
Data can exchange in the appropriate case, in order to embodiments of the invention described herein can with except here diagram or
Order beyond those described is implemented.Additionally, term " includes " and " having " and their any deformation, it is intended that cover
Cover non-exclusive comprising, such as, contain series of steps or the process of unit, method, system, product or equipment are not necessarily limited to
Those steps clearly listed or unit, but can include the most clearly listing or for these processes, method, product
Or intrinsic other step of equipment or unit.
Embodiment 1
According to embodiments of the present invention, it is provided that the embodiment of a kind of power-line carrier communication method, it should be noted that
Step shown in the flow chart of accompanying drawing can perform in the computer system of such as one group of computer executable instructions, and,
Although showing logical order in flow charts, but in some cases, can perform shown with the order being different from herein
The step gone out or describe.
Fig. 1 is the flow chart of a kind of optional power-line carrier communication method according to embodiments of the present invention, such as Fig. 1 institute
Showing, the method comprises the steps:
Step S102, when the first power frequency zero cross signal being detected, generates the pulse-modulated signal of predeterminated frequency.
Concrete, above-mentioned power frequency zero crossing for represent on electric lines of force transmission in AC system, when alternating current
Waveform is when just half circumference negative half period conversion, through zero-bit, the signal of system detection.Power frequency zero cross signal refers in exchange
In system, when waveform is from just half circumference negative half period conversion, through the detection that zero-bit system is made.
Above-mentioned predeterminated frequency carries out, less than in prior art, hundreds of KHz that the carrier signal of power line communication is used.
Step S104, uses pulse-modulated signal to be modulated primary carrier signal, so that signal coupling circuit will modulation
After carrier signal coupled to the high pressure power frequency electric line of force.
If herein it should be noted that the alternating current voltage transmitted on electric lines of force reaches exactly to during peak value believe carrier wave
Number being modulated, the impact to load is very big, carries out the modulation of carrier signal, now power frequency when power frequency zero cross signal being detected
The signal of zero crossing adnexa is the most weak, easily realizes coupling of carrier signal and high-frequency signal, thus improves coupling efficiency.
Step S106, the carrier signal after modulation is solved by the same power frequency zero crossing corresponding at power frequency zero cross signal
Adjusting, wherein, the carrier signal after modulation is coupled from the high pressure power frequency electric line of force by signal coupling circuit and obtains.
The power frequency zero crossing the most still selecting the power frequency zero cross signal detected during modulation corresponding is demodulated, and plays communication
Synchronization so that launch and receiving terminal realize synchronizing, thus ensured communication success rate.Due to power frequency zero crossing adnexa
Signal is the most weak, and the carrier signal after easily realizing modulation couples with low frequency signal, thus improves coupling efficiency, therefore modulation with
Demodulation all selects to carry out at power frequency zero crossing.
With power frequency as 50KHz, carrier signal be 2.6KHz as example, signal coupling circuit is connected to high pressure power frequency electric power
Between line and processor, stop the power-frequency voltage of 50KHz to pass through, and make the carrier signal of 2.6KHz pass through, thus transmission is to place
Reason device.
From the foregoing, it will be observed that the application above-mentioned steps is when power frequency zero cross signal being detected, generate the impulse modulation of predeterminated frequency
Signal;Use pulse-modulated signal that primary carrier signal is modulated, so that signal coupling circuit is by the carrier signal after modulation
It coupled to the high pressure power frequency electric line of force;Carrier signal after modulation is entered by the same power frequency zero crossing corresponding at power frequency zero cross signal
Row demodulation;Wherein, the carrier signal after modulation is coupled from the high pressure power frequency electric line of force by signal coupling circuit and obtains.Above-mentioned side
Case is by using the carrier signal of predeterminated frequency, owing to the carrier signal of predeterminated frequency can be less than in prior art hundreds of thousand
The carrier signal of hertz, and when power frequency zero crossing, carrier signal is modulated, to coupled in the high pressure power frequency electric line of force, from
And avoid the bigger decay to carrier signal of the high pressure power frequency electric line of force caused by the frequency height of carrier signal, simultaneously
Ensure that transmission range (not less than 2.5 kms) farther out, the signal solving power line carrier, PLC of the prior art declines
Subtract the technical problem big, reliability is low.
Optionally, according to the above embodiments of the present application, couple from the high pressure power frequency electric line of force at signal coupling circuit and obtain
Before carrier signal, method also includes:
Step S1061, the carrier signal after modulation is coupled to the high pressure power frequency electric line of force by coupling circuit.
In above-mentioned steps, while coupling circuit carrier signal after modulating coupled to the high pressure power frequency electric line of force,
The technique effect of power frequency high voltage isolation can also be reached.
Optionally, according to the above embodiments of the present application, couple from the high pressure power frequency electric line of force receiving signal coupling circuit
Carrier signal after, method also includes:
Step S1063, is filtered carrier signal processing, and wherein, Filtering Processing includes: active power filtering, passive filtering
Amplify with signal.
Optionally, according to the above embodiments of the present application, the same power frequency zero crossing corresponding at power frequency zero cross signal is exchanged
Carrier signal after system is demodulated, including:
Step S1081, is sampled to the carrier signal being filtered after processing by analog-to-digital conversion device.
Step S1083, the carrier signal obtaining sampling carries out digital filtering and fast Fourier transform, with to carrier wave
Signal is demodulated, and obtains primary carrier signal.
Above-mentioned steps is demodulated by the carrier signal coupleding to signal coupling circuit at processor, is published originally
Ripple signal, thus the communication of signal is completed by the high pressure power frequency electric line of force.
As a kind of optional embodiment, carrier signal can be carried out analog digital conversion, and to the carrier signal after conversion
Carry out digital filtering, and by the way of manchester decoder, carrier signal is decoded, obtain primary carrier signal.
Optionally, according to the above embodiments of the present application, predeterminated frequency is 2.6KHz.
Embodiment 2
Present invention also provides a kind of power-line carrier communication system, Fig. 2 is a kind of electric power according to the embodiment of the present application
The structural representation of line carrier communication system, this power-line carrier communication system includes:
Power frequency zero cross detection circuit 20, is used for carrying out power frequency zero passage detection, generates power frequency zero cross signal.
Concrete, above-mentioned power frequency zero crossing for represent on electric lines of force transmission in AC system, when alternating current
Waveform is when just half circumference negative half period conversion, through zero-bit, the signal of system detection.Power frequency zero cross signal refers in exchange
In system, when waveform is from just half circumference negative half period conversion, through the detection that zero-bit system is made.
Signal coupling circuit 22, is connected with processor and the high pressure power frequency electric line of force respectively, for the load modulated by processor
Ripple signal coupled to the high pressure power frequency electric line of force of transmitting terminal, and coupled to process by the carrier signal that the high pressure power frequency electric line of force is transmitted
Device.
Processor 24, is connected with power frequency zero cross detection circuit, for when the work that power frequency zero cross detection circuit provides being detected
Frequently, during zero cross signal, primary carrier signal is modulated by the pulse-modulated signal generating predeterminated frequency, and at power frequency zero cross signal
Carrier signal after the modulation that signal coupling circuit is coupled by corresponding same power frequency zero crossing is demodulated.
If herein it should be noted that the alternating current voltage transmitted on electric lines of force reaches exactly to during peak value believe carrier wave
Number being modulated, the impact to load is very big, carries out the modulation of carrier signal, now power frequency when power frequency zero cross signal being detected
The signal of zero crossing adnexa is the most weak, easily realizes coupling of carrier signal and high-frequency signal, thus improves coupling efficiency, and still selects
The power frequency zero crossing that the power frequency zero cross signal that detects when selecting modulation is corresponding is demodulated, and plays the synchronization of communication so that
Launch and receiving terminal realizes synchronizing, thus ensured communication success rate.
From the foregoing, it will be observed that the application said system carries out power frequency zero passage detection by power frequency zero cross detection circuit, generate power frequency
Zero cross signal, coupled to the high pressure power frequency electric line of force of transmitting terminal by signal coupling circuit by the carrier signal that processor is modulated,
And the carrier signal that the high pressure power frequency electric line of force is transmitted is coupled to processor, by processor and power frequency zero cross detection circuit phase
Even, for when the power frequency zero cross signal that power frequency zero cross detection circuit provides being detected, the impulse modulation letter of predeterminated frequency is generated
Number primary carrier signal is modulated, and at same power frequency zero crossing corresponding to power frequency zero cross signal to signal coupling circuit coupling
Carrier signal after the modulation closed is demodulated.Such scheme is by using the carrier signal of predeterminated frequency, due to predeterminated frequency
Carrier signal can be less than the carrier signal of hundreds of KHz in prior art, and when power frequency zero crossing to carrier signal
It is modulated, to coupled in the high pressure power frequency electric line of force, thus avoids the high pressure caused by the frequency height of carrier signal
The bigger decay to carrier signal of the power frequency electric line of force, ensure that transmission range (not less than 2.5 kms) farther out simultaneously, solves
Determine the technical problem that signal attenuation is big, reliability is low of power line carrier, PLC of the prior art.
Optionally, according to the above embodiments of the present application, power frequency zero cross detection circuit includes:
Diode, is connected with the high pressure power frequency electric line of force, in the high pressure power frequency electric line of force alternating current on the occasion of time lead
Logical.
Optocoupler, is connected with diode, for making power supply and ground conducting in the case of diode current flow.
In foregoing circuit, diode for alternating current in the high pressure power frequency electric line of force be on the occasion of time turn on so that
Obtain the power frequency zero cross signal that optocoupler output is corresponding.
Power supply, is connected with optocoupler.
Outfan, for exporting corresponding signal at power supply in the case of ground conducting, is otherwise output as zero;Wherein, work
Frequently zero cross signal be outfan output signal jump vanishing time signal.
Optionally, according to the above embodiments of the present application, optocoupler includes:
Light emitting diode, the positive pole of light emitting diode is connected with the negative pole of diode, and negative pole is connected with the positive pole of diode,
It is same as in the case of diode current flow turning on.
Phototriode, the grounded emitter of phototriode, colelctor electrode is connected with outfan, at light emitting diode
Turn in the case of conducting.
In the case of LEDs ON, the voltage between phototriode base stage and emitter stage is more than photosensitive three poles
The conducting voltage of pipe, so that phototriode conducting.
Wherein, power supply is connected to the colelctor electrode of phototriode.
Foregoing circuit is in the case of phototriode turns on, and power supply is by phototriode and ground conducting, and outfan is even
It is connected between power supply and the colelctor electrode of phototriode, corresponding to output in the case of ground conducting by phototriode at power supply
Level.
Optionally, according to the above embodiments of the present application, power frequency zero cross detection circuit also includes:
First divider resistance, is connected between the negative pole of diode and the high pressure power frequency electric line of force, for high pressure power frequency electric
The power supply that the line of force provides carries out dividing potential drop.
Second divider resistance, is connected between power supply and the colelctor electrode of phototriode.
3rd divider resistance, is connected between the second divider resistance and outfan, is used for and the second divider resistance is to power supply
Carry out dividing potential drop.
Fig. 3 is a kind of optional power frequency zero cross detection circuit according to the embodiment of the present application, understands in conjunction with Fig. 3, power frequency electric
The power supply of the line of force is-220V, 50Hz, is connected by the first divider resistance (resistance 1) with diode, the port 1 of optocoupler and two poles
The negative pole of pipe is connected, and port 2 is connected with the positive pole of diode, and port 3 is connected to the ground, and port 4 is by the second divider resistance (resistance
2) connect be connected with power supply VCC, and port 4 also by after the 3rd divider resistance (resistance 3) as outfan, in alternating current zero passage
Time to processor export power frequency zero passage interrupt signal at end.
Optionally, according to the above embodiments of the present application, signal coupling circuit includes:
Coupling transformer, the two ends of the first winding of coupling transformer are connected to the high pressure power frequency electric line of force, the second winding
Two ends are connected to processor.
Capacitor and resistance, be connected between coupling transformer and the high pressure power frequency electric line of force, for carrying out carrier signal
Filtering.
Fig. 4 is the schematic diagram of a kind of optional coupling circuit according to the embodiment of the present application, in a kind of optional embodiment
In, use T coupling transformer, and at the port 1 of T coupling transformer by handing over power frequency for the reactor of filtering and capacitor
Stream power supply is connected, and port 2 connects the other end with power frequency AC, and port 3 and port 4 are connected to processor, at processor
After primary carrier signal is modulated by generation pulse signal, the carrier signal after modulating is paramount by the coupling of T coupling transformer
In the pressure power frequency electric line of force.
Optionally, according to the above embodiments of the present application, signal coupling circuit is additionally operable to carry out power frequency high voltage isolation.
Optionally, according to the above embodiments of the present application, system also includes:
Filter circuit, including passive filtering unit, active power filtering unit and amplifying unit, is sequentially connected to signal coupling electricity
Between road and processor, it coupled in the carrier signal of processor preset beyond carrier frequency for filtering signal coupling circuit
Noise, and amplify carrier signal.
Fig. 5 is the structure chart of a kind of optional filter circuit according to the embodiment of the present application, in conjunction with the example shown in Fig. 5,
Coupled signal is the carrier signal being coupled to processor by signal coupling circuit from the high pressure power frequency electric line of force, and processor is to coupling
After signal carries out passive filtering, active power filtering and amplification, outgoing carrier signal.
Optionally, according to the above embodiments of the present application, processor includes:
Modulating unit, is modulated primary carrier signal for generating the pulse-modulated signal of predeterminated frequency.
Demodulating unit, is connected with signal coupling circuit, for being demodulated the carrier signal of signal coupling circuit coupling.
Herein it should be noted that owing to the voltage signal of electric lines of force is the most weak at the signal of power frequency zero crossing adnexa, hold most
Easily realizing the coupling of high-frequency signal, the process of above-mentioned modulation and demodulation is all carried out when processor receives zero cross signal.
Optionally, according to the above embodiments of the present application, demodulating unit includes:
Analog digital conversion subelement, is connected with filter circuit, carries out analog digital conversion for filtered carrier signal.
In foregoing circuit, ADC (Analog-to-Digital Converter) can be passed through and carry out analog digital conversion, from
And avoid aliasing.
Data filtering subelement, is connected with analog digital conversion subelement, for digital carrier signal is carried out digital filtering.
Fast Fourier transform subelement, is connected with data filtering subelement, for believing according to filtered digital carrier
Number demodulate CF signal.
Decoding subelement, is connected with fast Fourier transform subelement, for decoding primary carrier letter according to CF signal
Number.
Fig. 6 is the structural representation of a kind of optional demodulating unit according to the embodiment of the present application, power frequency mistake detected
When zero-signal, filtered signal is carried out analog digital conversion, then carries out digital filtering, after fast fourier transform
It is decoded, obtains primary carrier signal.
Optionally, according to the above embodiments of the present application, predeterminated frequency is 2.6KHz.
The invention described above embodiment sequence number, just to describing, does not represent the quality of embodiment.
In the above embodiment of the present invention, the description to each embodiment all emphasizes particularly on different fields, and does not has in certain embodiment
The part described in detail, may refer to the associated description of other embodiments.
In several embodiments provided herein, it should be understood that disclosed technology contents, can be passed through other
Mode realizes.Wherein, device embodiment described above is only schematically, the division of the most described unit, Ke Yiwei
A kind of logic function divides, actual can have when realizing other dividing mode, the most multiple unit or assembly can in conjunction with or
Person is desirably integrated into another system, or some features can be ignored, or does not performs.Another point, shown or discussed is mutual
Between coupling direct-coupling or communication connection can be the INDIRECT COUPLING by some interfaces, unit or module or communication link
Connect, can be being electrical or other form.
The described unit illustrated as separating component can be or may not be physically separate, shows as unit
The parts shown can be or may not be physical location, i.e. may be located at a place, or can also be distributed to multiple
On unit.Some or all of unit therein can be selected according to the actual needs to realize the purpose of the present embodiment scheme.
It addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, it is also possible to
It is that unit is individually physically present, it is also possible to two or more unit are integrated in a unit.Above-mentioned integrated list
Unit both can realize to use the form of hardware, it would however also be possible to employ the form of SFU software functional unit realizes.
If described integrated unit realizes and as independent production marketing or use using the form of SFU software functional unit
Time, can be stored in a computer read/write memory medium.Based on such understanding, technical scheme is substantially
The part that in other words prior art contributed or this technical scheme completely or partially can be with the form of software product
Embodying, this computer software product is stored in a storage medium, including some instructions with so that a computer
Equipment (can be for personal computer, server or the network equipment etc.) perform the whole of method described in each embodiment of the present invention or
Part steps.And aforesaid storage medium includes: USB flash disk, read only memory (ROM, Read-Only Memory), random access memory are deposited
Reservoir (RAM, Random Access Memory), portable hard drive, magnetic disc or CD etc. are various can store program code
Medium.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For Yuan, under the premise without departing from the principles of the invention, it is also possible to make some improvements and modifications, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (15)
1. a power-line carrier communication method, it is characterised in that including:
When power frequency zero cross signal being detected, generate the pulse-modulated signal of predeterminated frequency;
Use described pulse-modulated signal that primary carrier signal is modulated, so that signal coupling circuit is by the carrier wave letter after modulation
Number it coupled to the high pressure power frequency electric line of force;
Carrier signal after modulation is demodulated by the same power frequency zero crossing corresponding at described power frequency zero cross signal, wherein,
Carrier signal after described modulation is coupled from the described high pressure power frequency electric line of force by described signal coupling circuit and obtains.
Method the most according to claim 1, it is characterised in that at described signal coupling circuit from the high pressure power frequency electric line of force
Before coupling the carrier signal after being modulated, described method also includes:
Carrier signal after modulation is coupled to the described high pressure power frequency electric line of force by described coupling circuit.
Method the most according to claim 2, it is characterised in that at described signal coupling circuit from the high pressure power frequency electric line of force
After coupling the carrier signal after being modulated, described method also includes:
Being filtered described carrier signal processing, wherein, described Filtering Processing includes: active power filtering, passive filtering and signal
Amplify.
Method the most according to claim 1, it is characterised in that in the same power frequency mistake that described power frequency zero cross signal is corresponding
Carrier signal after modulation is demodulated by zero point, including:
By analog-to-digital conversion device, the carrier signal being filtered after processing is sampled;
The carrier signal obtaining sampling carries out digital filtering and fast Fourier transform, to solve described carrier signal
Adjust, obtain described primary carrier signal.
Method the most according to claim 1, it is characterised in that described predeterminated frequency is 2.6KHz.
6. a power-line carrier communication system, it is characterised in that including:
Power frequency zero cross detection circuit, is used for carrying out power frequency zero passage detection, generates power frequency zero cross signal;
Signal coupling circuit, is connected with processor and the high pressure power frequency electric line of force respectively, for the carrier wave modulated by described processor
Signal coupled to the high pressure power frequency electric line of force of transmitting terminal, and the carrier signal that the high pressure power frequency electric line of force is transmitted is coupled to described place
Reason device;
Described processor, is connected with described power frequency zero cross detection circuit, for when detecting that described power frequency zero cross detection circuit carries
During the power frequency zero cross signal of confession, primary carrier signal is modulated by the pulse-modulated signal generating predeterminated frequency, and in described work
Carrier signal after the modulation that described signal coupling circuit is coupled by the same power frequency zero crossing that zero cross signal is corresponding frequently is carried out
Demodulation.
System the most according to claim 6, it is characterised in that described power frequency zero cross detection circuit includes:
Diode, is connected with the described high pressure power frequency electric line of force, in the high pressure power frequency electric line of force alternating current on the occasion of time lead
Logical;
Optocoupler, is connected with described diode, for making power supply and ground conducting in the case of described diode current flow;
Described power supply, is connected with described optocoupler;
Outfan, for exporting corresponding signal at described power supply in the case of ground conducting, is otherwise output as zero;
Wherein, described power frequency zero cross signal be described outfan output signal jump vanishing time signal.
System the most according to claim 7, it is characterised in that described optocoupler includes:
Light emitting diode, the positive pole of described light emitting diode is connected with the negative pole of described diode, negative pole and described diode
Positive pole is connected, and is same as in the case of described diode current flow turning on;
Phototriode, the grounded emitter of described phototriode, colelctor electrode is connected with described outfan, at described
Turn in the case of optical diode conducting;
Wherein, described power supply is connected to the colelctor electrode of described phototriode.
System the most according to claim 8, it is characterised in that described power frequency zero cross detection circuit also includes:
First divider resistance, is connected between the negative pole of described diode and the described high pressure power frequency electric line of force, for described height
The power supply that the pressure power frequency electric line of force provides carries out dividing potential drop;
Second divider resistance, is connected between the colelctor electrode of described power supply and described phototriode;
3rd divider resistance, is connected between described second divider resistance and described outfan, for electric with described second dividing potential drop
Resistance carries out dividing potential drop to described power supply.
System the most according to claim 6, it is characterised in that described signal coupling circuit includes:
Coupling transformer, the two ends of the first winding of described coupling transformer are connected to the described high pressure power frequency electric line of force, second around
The two ends of group are connected to described processor;
Capacitor and resistance, be connected between described coupling transformer and the described high pressure power frequency electric line of force, for carrier signal
It is filtered.
11. systems according to claim 10, it is characterised in that described signal coupling circuit is additionally operable to carry out power frequency high voltage
Isolation.
12. systems according to claim 6, it is characterised in that described system also includes:
Filter circuit, including passive filtering unit, active power filtering unit and amplifying unit, is sequentially connected to described signal coupling electricity
Between road and described processor, it coupled in the carrier signal of described processor preset load for filtering described signal coupling circuit
Noise beyond wave frequency, and amplify described carrier signal.
13. systems according to claim 12, it is characterised in that described processor includes:
Modulating unit, is modulated primary carrier signal for generating the pulse-modulated signal of predeterminated frequency;
Demodulating unit, is connected with described signal coupling circuit, carries out for the carrier signal coupling described signal coupling circuit
Demodulation.
14. systems according to claim 13, it is characterised in that described demodulating unit includes:
Analog digital conversion subelement, is connected with described filter circuit, carries out analog digital conversion for filtered carrier signal;
Data filtering subelement, is connected with described analog digital conversion subelement, for digital carrier signal is carried out digital filtering;
Fast Fourier transform subelement, is connected with described data filtering subelement, for believing according to filtered digital carrier
Number demodulate CF signal;
Decoding subelement, is connected with described fast Fourier transform subelement, described for decoding according to described CF signal
Primary carrier signal.
15. systems according to claim 6, it is characterised in that described predeterminated frequency is 2.6KHz.
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