CN106230482B - Power-line carrier communication method and system - Google Patents
Power-line carrier communication method and system Download PDFInfo
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- CN106230482B CN106230482B CN201610742968.0A CN201610742968A CN106230482B CN 106230482 B CN106230482 B CN 106230482B CN 201610742968 A CN201610742968 A CN 201610742968A CN 106230482 B CN106230482 B CN 106230482B
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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 systems.Wherein, this method comprises: when detecting power frequency zero cross signal, the pulse-modulated signal of predeterminated frequency is generated；Primary carrier signal is modulated using pulse-modulated signal, so that modulated carrier signal is couple the high pressure power frequency electric line of force by signal coupling circuit；Modulated carrier signal is demodulated in the corresponding same power frequency zero crossing of power frequency zero cross signal；Wherein, modulated carrier signal is coupled from the high pressure power frequency electric line of force by signal coupling circuit and is obtained.The technical problem that the signal decaying that the present invention solves power line carrier, PLC in the prior art is big, reliability is low.
Description
Technical field
The present invention relates to the communications fields, in particular to a kind of power-line carrier communication method and system.
Background technique
Currently, belonging to low-voltage powerline carrier communication (PLC, Power by the communication that carrier is realized of power distribution power line
Line Communication), it is meant that: by the way that the mesh of transmission information (communication) will be reached in information " load " to power line
's.
Due to the related equipment on power line and power distribution network be all with transmit AC energy (usually 50Hz) design, and
Unsuitable transmission frequency is significantly larger than the common PLC signal of power frequency, as the communication of transmission medium, in the higher situation of frequency
The decaying of lower signal is more serious, and transmission reliability is lower.Therefore, if being realized using traditional power line carrier communication long-range logical
Letter, it is necessary to just be able to achieve telecommunication by repeatedly relaying, multirouting, which repeatedly relays, necessarily substantially reduces the reliable of signal transmission
Property, and when there is capacitive load on route, biggish decaying can be constituted to carrier signal.
For power line carrier, PLC in the prior art signal decaying is big, problem that reliability is low, not yet propose at present
Effective solution scheme.
Summary of the invention
The embodiment of the invention provides a kind of power-line carrier communication method and systems, in the prior art at least to solve
The technical problem that the signal decaying of power line carrier, PLC is big, reliability is low.
According to an aspect of an embodiment of the present invention, a kind of power-line carrier communication method is provided, comprising: when detecting
When power frequency zero cross signal, the pulse-modulated signal of predeterminated frequency is generated；Primary carrier signal is adjusted using pulse-modulated signal
System, so that modulated carrier signal is couple the high pressure power frequency electric line of force by signal coupling circuit；It is corresponding in power frequency zero cross signal
The same power frequency zero crossing modulated carrier signal is demodulated；Wherein, modulated carrier signal passes through signal coupling
Conjunction circuit is coupled from the high pressure power frequency electric line of force to be obtained.
Further, modulated carrier signal is couple the high pressure power frequency electric line of force by the coupling circuit.
Further, the carrier signal is filtered, wherein the filtering processing includes: active power filtering, nothing
Source filtering and signal amplification.
Further, the carrier signal after being filtered is sampled by analog-to-digital conversion device；Sampling is obtained
Carrier signal carry out digital filtering and Fast Fourier Transform (FFT) and obtain the original to demodulate to the carrier signal
Carrier signal.
Further, predeterminated frequency 2.6KHz.
According to another aspect of an embodiment of the present invention, a kind of power-line carrier communication system is additionally provided, comprising: power frequency mistake
Zero detection circuit generates power frequency zero cross signal for carrying out power frequency zero passage detection；Signal coupling circuit, respectively with processor and
The high pressure power frequency electric line of force is connected, and the carrier signal for modulating processor is coupled to the high pressure power frequency electric line of force of transmitting terminal, and
Processor is couple by the carrier signal that the high pressure power frequency electric line of force is transmitted；Processor is connected with power frequency zero cross detection circuit, is used for
When detecting the power frequency zero cross signal that power frequency zero cross detection circuit provides, the pulse-modulated signal of predeterminated frequency is generated to published originally
Wave signal is modulated, and signal coupling circuit is coupled in the power frequency zero cross signal corresponding same power frequency zero crossing
Modulated carrier signal is demodulated.
Further, power frequency zero cross detection circuit includes: diode, is connected with the high pressure power frequency electric line of force, in high pressure
Alternating current in the power frequency electric line of force is connected when being positive value；Optocoupler is connected with diode, for making in the case where diode current flow
Power supply and ground are connected；Power supply is connected with the optocoupler；Output end, for the output pair in the case where the power supply and ground are connected
The signal answered, otherwise output is zero；Wherein, power frequency zero cross signal is that the signal of output end output jumps letter when becoming zero
Number.
Further, optocoupler includes: light emitting diode, and the anode of light emitting diode is connected with the cathode of diode, cathode
It is connected with the anode of diode, is same as being connected in the case where diode current flow；Phototriode, the emitter of phototriode
Ground connection, collector is connected with output end, for being connected in the case where LEDs ON；Wherein, power supply is connected to photosensitive
The collector of triode.
Further, power frequency zero cross detection circuit further include: the first divider resistance is connected to the cathode and high pressure of diode
Between the power frequency electric line of force, the power supply for providing the high pressure power frequency electric line of force is divided；Second divider resistance, is connected to power supply
Between the collector of phototriode；Third divider resistance is connected between the second divider resistance and output end, for and the
Two divider resistances divide power supply.
Further, signal coupling circuit includes: coupling transformer, and the both ends of the first winding of coupling transformer are connected to
The high pressure power frequency electric line of force, the both ends of the second winding are connected to processor；Capacitor and resistance, are connected to coupling transformer and high pressure
Between the power frequency electric line of force, for being filtered to carrier signal.
Further, signal coupling circuit is also used to carry out power frequency high voltage isolation.
Further, system further include: filter circuit, including passive filtering unit, active power filtering unit and amplifying unit,
It is sequentially connected between signal coupling circuit and processor, the carrier signal for being coupled to processor for filtering out signal coupling circuit
In preset noise other than carrier frequency, and amplify carrier signal.
Further, processor includes: modulation unit, and the pulse-modulated signal for generating predeterminated frequency believes primary carrier
It number is modulated；Demodulating unit is connected with signal coupling circuit, for solving to the carrier signal that signal coupling circuit couples
It adjusts.
Further, demodulating unit includes: analog-to-digital conversion subelement, is connected with filter circuit, and filtered carrier wave is used for
Signal carries out analog-to-digital conversion；Data filtering subelement is connected with analog-to-digital conversion subelement, for counting to digital carrier signal
Word filtering；Fast Fourier Transform (FFT) subelement is connected with data filtering subelement, for according to filtered digital carrier signal
Demodulate CF signal；Decoding subunit is connected with Fast Fourier Transform (FFT) subelement, for decoding original according to CF signal
Carrier signal.
Further, predeterminated frequency 2.6KHz.
Another aspect according to an embodiment of the present invention, provides a kind of storage medium, and storage medium includes the journey of storage
Sequence, wherein equipment where control storage medium executes above-mentioned power-line carrier communication method in program operation.
Another aspect according to an embodiment of the present invention provides a kind of processor, and processor is used to run program,
In, program executes above-mentioned power-line carrier communication method when running.
In embodiments of the present invention, the application above-mentioned steps generate default frequency when detecting the first power frequency zero cross signal
The pulse-modulated signal of rate is modulated primary carrier signal using pulse-modulated signal, so that signal coupling circuit will be modulated
Carrier signal afterwards is coupled to the high pressure power frequency electric line of force, receives the carrier wave that signal coupling circuit is coupled from the high pressure power frequency electric line of force
Signal demodulates carrier signal when detecting the second power frequency zero cross signal.Above scheme is by using predeterminated frequency
Carrier signal, since the carrier signal of predeterminated frequency can be the carrier signal lower than several hundred kHz in the prior art, and
Carrier signal is modulated when power frequency zero crossing, to be coupled in the high pressure power frequency electric line of force, is believed so as to avoid due to carrier wave
Number frequency height caused by biggish decaying of the high pressure power frequency electric line of force to carrier signal, while can guarantee farther away transmission
Distance (be not less than 2.5 kms), the technology that the signal decaying for solving power line carrier, PLC in the prior art is big, reliability is low
Problem.
Detailed description of the invention
The drawings described herein are used to provide a further understanding of the present invention, constitutes part of this application, this hair
Bright illustrative embodiments and their description are used to explain the present invention, and are not constituted improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is a kind of flow chart of optional power-line carrier communication method according to an embodiment of the present invention；
Fig. 2 is the structural schematic diagram according to a kind of power-line carrier communication system of 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 according to a kind of optional coupling circuit of the embodiment of the present application；
Fig. 5 is the structure chart according to a kind of optional filter circuit of the embodiment of the present application；And
Fig. 6 is the structural schematic diagram according to a kind of optional demodulating unit of the embodiment of the present application.
Specific embodiment
In order to enable those skilled in the art to better understand the solution of the present invention, below in conjunction in the embodiment of the present invention
Attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is only
The embodiment of a part of the invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill people
The model that the present invention protects all should belong in member's every other embodiment obtained without making creative work
It encloses.
It should be noted that description and claims of this specification and term " first " in above-mentioned attached drawing, "
Two " etc. be to be used to distinguish similar objects, without being used to describe a particular order or precedence order.It should be understood that using in this way
Data be interchangeable under appropriate circumstances, so as to the embodiment of the present invention described herein can in addition to illustrating herein or
Sequence other than those of description is implemented.In addition, term " includes " and " having " and their any deformation, it is intended that cover
Cover it is non-exclusive include, for example, the process, method, system, product or equipment for containing a series of steps or units are not necessarily limited to
Step or unit those of is clearly listed, but may include be not clearly listed or for these process, methods, product
Or other step or units that equipment is intrinsic.
Embodiment 1
According to embodiments of the present invention, a kind of embodiment of power-line carrier communication method is provided, it should be noted that
The step of process of attached drawing illustrates can execute in a computer system such as a set of computer executable instructions, also,
It, in some cases, can be to be different from shown in sequence execution herein although logical order is shown in flow charts
The step of out or describing.
Fig. 1 is a kind of flow chart of optional power-line carrier communication method according to an embodiment of the present invention, such as Fig. 1 institute
Show, this method comprises the following steps:
Step S102 generates the pulse-modulated signal of predeterminated frequency when detecting the first power frequency zero cross signal.
Specifically, above-mentioned power frequency zero crossing be used to indicate to transmit on power line in AC system, when alternating current
When waveform is converted from positive half cycle to negative half period, when by zero-bit, the signal of system detection.Power frequency zero cross signal refers to exchanging
In system, when waveform is converted from positive half cycle to negative half period, the detection made by system when zero-bit.
Above-mentioned predeterminated frequency is lower than several hundred kHz used in the carrier signal for carrying out power line communication in the prior art.
Step S104 is modulated primary carrier signal using pulse-modulated signal, so that signal coupling circuit will be modulated
Carrier signal afterwards is coupled to the high pressure power frequency electric line of force.
Herein it should be noted that if believing when the alternating current voltage transmitted on power line reaches exactly to peak value carrier wave
It number is modulated, it is very big to the impact of load, the modulation of carrier signal is carried out when detecting power frequency zero cross signal, at this time power frequency
The signal of zero crossing attachment is most weak, the coupling of carrier signal easy to accomplish and high-frequency signal, to improve coupling efficiency.
Step S106 solves modulated carrier signal in the corresponding same power frequency zero crossing of power frequency zero cross signal
It adjusts, wherein modulated carrier signal is coupled from the high pressure power frequency electric line of force by signal coupling circuit and obtained.
It still selects the corresponding power frequency zero crossing of power frequency zero cross signal detected when modulation to be demodulated herein, plays communication
Synchronous effect so that transmitting it is synchronous with receiving end realization, to ensure communication success rate.Due to power frequency zero crossing attachment
Signal is most weak, the coupling of modulated carrier signal and low frequency signal easy to accomplish, to improve coupling efficiency, therefore modulate and
Demodulation all selections are carried out in power frequency zero crossing.
It is 50KHz with power frequency, carrier signal is 2.6KHz as an example, signal coupling circuit is connected to high pressure power frequency electric power
Between line and processor, the power-frequency voltage of 50KHz is prevented to pass through, and pass through the carrier signal of 2.6KHz, to be transmitted to place
Manage device.
From the foregoing, it will be observed that the application above-mentioned steps when detecting power frequency zero cross signal, generate the impulse modulation of predeterminated frequency
Signal；Primary carrier signal is modulated using pulse-modulated signal, so that signal coupling circuit is by modulated carrier signal
It is coupled to the high pressure power frequency electric line of force；The corresponding same power frequency zero crossing of power frequency zero cross signal to modulated carrier signal into
Row demodulation；Wherein, modulated carrier signal is coupled from the high pressure power frequency electric line of force by signal coupling circuit and is obtained.Above-mentioned side
Case by using predeterminated frequency carrier signal, since the carrier signal of predeterminated frequency can be lower than in the prior art several hundred thousand
The carrier signal of hertz, and carrier signal is modulated in power frequency zero crossing, to be coupled in the high pressure power frequency electric line of force, from
And biggish decaying of the high pressure power frequency electric line of force to carrier signal due to caused by the frequency height of carrier signal is avoided, simultaneously
It can guarantee farther away transmission range (not less than 2.5 kms), the signal for solving power line carrier, PLC in the prior art declines
Subtract technical problem big, that reliability is low.
Optionally, it according to the above embodiments of the present application, couples and obtains from the high pressure power frequency electric line of force in signal coupling circuit
Before carrier signal, method further include:
Modulated carrier signal is couple the high pressure power frequency electric line of force by step S1061, coupling circuit.
In above-mentioned steps, coupling circuit while coupleeing the high pressure power frequency electric line of force for modulated carrier signal,
The technical effect of power frequency high voltage isolation can also be reached.
Optionally, it according to the above embodiments of the present application, is coupled from the high pressure power frequency electric line of force receiving signal coupling circuit
Carrier signal after, method further include:
Step S1063, is filtered carrier signal, wherein filtering processing includes: active power filtering, passive filtering
Amplify with signal.
Optionally, it according to the above embodiments of the present application, is exchanged in the corresponding same power frequency zero crossing of power frequency zero cross signal
Carrier signal after system is demodulated, comprising:
Step S1081 samples the carrier signal after being filtered by analog-to-digital conversion device.
Step S1083 carries out digital filtering and Fast Fourier Transform (FFT) to the carrier signal that sampling obtains, to carrier wave
Signal is demodulated, and primary carrier signal is obtained.
Above-mentioned steps are demodulated by the carrier signal being coupled at processor to signal coupling circuit, published originally to obtain
Wave signal, to complete the communication of signal by the high pressure power frequency electric line of force.
As a kind of optional embodiment, carrier signal can be carried out to analog-to-digital conversion, and to the carrier signal after conversion
Digital filtering is carried out, and carrier signal is decoded by way of manchester decoder, obtains primary carrier signal.
Optionally, according to the above embodiments of the present application, predeterminated frequency 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 schematic diagram of line carrier communication system, the power-line carrier communication system include:
Power frequency zero cross detection circuit 20 generates power frequency zero cross signal for carrying out power frequency zero passage detection.
Specifically, above-mentioned power frequency zero crossing be used to indicate to transmit on power line in AC system, when alternating current
When waveform is converted from positive half cycle to negative half period, when by zero-bit, the signal of system detection.Power frequency zero cross signal refers to exchanging
In system, when waveform is converted from positive half cycle to negative half period, the detection made by system when zero-bit.
Signal coupling circuit 22 is connected with processor and the high pressure power frequency electric line of force respectively, the load for modulating processor
Wave signal is coupled to the high pressure power frequency electric line of force of transmitting terminal, and couples processing for 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 for detecting that power frequency zero cross detection circuit provides
When frequency zero cross signal, the pulse-modulated signal for generating predeterminated frequency is modulated primary carrier signal, and in power frequency zero cross signal
The corresponding same power frequency zero crossing demodulates the modulated carrier signal that signal coupling circuit couples.
Herein it should be noted that if believing when the alternating current voltage transmitted on power line reaches exactly to peak value carrier wave
It number is modulated, it is very big to the impact of load, the modulation of carrier signal is carried out when detecting power frequency zero cross signal, at this time power frequency
The signal of zero crossing attachment is most weak, and the coupling of carrier signal easy to accomplish and high-frequency signal to improve coupling efficiency, and is still selected
It selects the corresponding power frequency zero crossing of the power frequency zero cross signal detected when modulation to be demodulated, plays the synchronous effect of communication, so that
Transmitting is synchronous with receiving end realization, to ensure communication success rate.
From the foregoing, it will be observed that the application above system carries out power frequency zero passage detection by power frequency zero cross detection circuit, power frequency is generated
Zero cross signal couples the carrier signal that processor is modulated to by signal coupling circuit the high pressure power frequency electric line of force of transmitting terminal,
And processor is couple by the carrier signal that the high pressure power frequency electric line of force is transmitted, pass through processor and power frequency zero cross detection circuit phase
Even, for when detecting the power frequency zero cross signal that power frequency zero cross detection circuit provides, generating the impulse modulation letter of predeterminated frequency
Number primary carrier signal is modulated, and in the corresponding same power frequency zero crossing of power frequency zero cross signal to signal coupling circuit coupling
The modulated carrier signal closed is demodulated.Above scheme by using predeterminated frequency carrier signal, due to predeterminated frequency
Carrier signal can be the carrier signal lower than several hundred kHz in the prior art, and in power frequency zero crossing to carrier signal
It is modulated, to be coupled in the high pressure power frequency electric line of force, so as to avoid high pressure of the frequency due to carrier signal caused by high
Biggish decaying of the power frequency electric line of force to carrier signal, while can guarantee farther away transmission range (not less than 2.5 kms), solution
Determined power line carrier, PLC in the prior art signal decaying is big, technical problem that reliability is low.
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, leads when positive value for the alternating current in the high pressure power frequency electric line of force
It is logical.
Optocoupler is connected with diode, for being connected power supply and ground in the case where diode current flow.
In foregoing circuit, diode is used to be connected when the alternating current in the high pressure power frequency electric line of force is positive value, to make
It obtains optocoupler and exports corresponding power frequency zero cross signal.
Power supply is connected with optocoupler.
Output end, for exporting corresponding signal in the case where power supply is connected with ground, otherwise output is zero；Wherein, work
Frequency zero cross signal is the signal when signal jump of output end output becomes zero.
Optionally, according to the above embodiments of the present application, optocoupler includes:
The anode of light emitting diode, light emitting diode is connected with the cathode of diode, and cathode is connected with the anode of diode,
It is same as being connected in the case where diode current flow.
Phototriode, the emitter ground connection of phototriode, collector is connected with output end, in light emitting diode
It is connected in the case where conducting.
In the case where LEDs ON, the voltage between phototriode base stage and emitter is greater than photosensitive three pole
The conducting voltage of pipe, so that phototriode is connected.
Wherein, power supply is connected to the collector of phototriode.
In the case where phototriode is connected, power supply is connected foregoing circuit by phototriode and ground, and output end connects
It is connected between power supply and the collector of phototriode, in the case where power supply is connected by phototriode with ground, output phase is answered
Level.
Optionally, according to the above embodiments of the present application, power frequency zero cross detection circuit further include:
First divider resistance is connected between the cathode 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 is divided.
Second divider resistance is connected between power supply and the collector of phototriode.
Third divider resistance is connected between the second divider resistance and output end, is used for and the second divider resistance is to power supply
It is divided.
Fig. 3 is a kind of optional power frequency zero cross detection circuit according to the embodiment of the present application, in conjunction with Fig. 3 it is found that power frequency electric
The power supply of the line of force is -220V, 50Hz, is connected with diode by the first divider resistance (resistance 1), the port 1 and two poles of optocoupler
The cathode of pipe is connected, and port 2 is connected with the anode of diode, and port 3 is connected to the ground, and port 4 passes through the second divider resistance (resistance
2) connection is connected with power supply VCC, and port 4 is also used as output end by third divider resistance (resistance 3) afterwards, in alternating current zero passage
When to processor export power frequency zero passage end interrupt signal.
Optionally, according to the above embodiments of the present application, signal coupling circuit includes:
Coupling transformer, the both ends of the first winding of coupling transformer are connected to the high pressure power frequency electric line of force, the second winding
Both ends are connected to processor.
Capacitor and resistance are connected between coupling transformer and the high pressure power frequency electric line of force, for carrying out to carrier signal
Filtering.
Fig. 4 is according to a kind of schematic diagram of optional coupling circuit of the embodiment of the present application, in a kind of optional embodiment
In, using T coupling transformer, and passes through in the port of T coupling transformer 1 and handed over for the reactor and capacitor and power frequency of filtering
Galvanic electricity source is connected, and the other end of port 2 connection and power frequency AC, port 3 and port 4 are connected to processor, in processor
It is after generation pulse signal is modulated primary carrier signal, modulated carrier signal is supreme by the coupling of T coupling transformer
It presses in the power frequency electric line of force.
Optionally, according to the above embodiments of the present application, signal coupling circuit is also used to carry out power frequency high voltage isolation.
Optionally, according to the above embodiments of the present application, system further include:
Filter circuit, including passive filtering unit, active power filtering unit and amplifying unit are sequentially connected to signal coupling electricity
Between road and processor, it is coupled in the carrier signal of processor other than default carrier frequency for filtering out signal coupling circuit
Noise, and amplify carrier signal.
Fig. 5 is the example as shown in connection with fig. 5 according to a kind of structure chart of optional filter circuit of the embodiment of the present application,
Coupled signal is the carrier signal for being coupled to processor from the high pressure power frequency electric line of force by signal coupling circuit, 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:
Modulation unit, the pulse-modulated signal for generating predeterminated frequency are modulated primary carrier signal.
Demodulating unit is connected with signal coupling circuit, for demodulating to the carrier signal that signal coupling circuit couples.
Herein it should be noted that most holding since the voltage signal of power line is most weak in the signal of power frequency zero crossing attachment
Easily realize the coupling of high-frequency signal, all progress when processor receives zero cross signal of the process of above-mentioned modulation and demodulation.
Optionally, according to the above embodiments of the present application, demodulating unit includes:
Analog-to-digital conversion subelement, is connected with filter circuit, carries out analog-to-digital conversion for filtered carrier signal.
In foregoing circuit, analog-to-digital conversion can be carried out by ADC (Analog-to-Digital Converter), from
And avoid aliasing.
Data filtering subelement is connected with analog-to-digital conversion subelement, for carrying out digital filtering to digital carrier signal.
Fast Fourier Transform (FFT) subelement is connected with data filtering subelement, for being believed according to filtered digital carrier
Number demodulate CF signal.
Decoding subunit is connected with Fast Fourier Transform (FFT) subelement, for decoding primary carrier letter according to CF signal
Number.
Fig. 6 is to detect power frequency mistake according to a kind of structural schematic diagram of optional demodulating unit of the embodiment of the present application
When zero-signal, analog-to-digital conversion is carried out to filtered signal, digital filtering is then carried out, after Fast Fourier Transform
It is decoded, obtains primary carrier signal.
Optionally, according to the above embodiments of the present application, predeterminated frequency 2.6KHz.
Embodiment 3
According to the embodiment of the present application, a kind of storage medium is provided, storage medium includes the program of storage, wherein in journey
Equipment where controlling storage medium when sort run executes one of above-described embodiment power-line carrier communication method.
Embodiment 4
According to the embodiment of the present application, a kind of processor is provided, processor is for running program, wherein when program is run
Execute one of above-described embodiment power-line carrier communication method.
The serial number of the above embodiments of the invention is only for description, does not represent the advantages or disadvantages of the embodiments.
In the above embodiment of the invention, it all emphasizes particularly on different fields to the description of each embodiment, does not have in some embodiment
The part of detailed description, reference can be made to the related descriptions of other embodiments.
In several embodiments provided herein, it should be understood that disclosed technology contents can pass through others
Mode is realized.Wherein, the apparatus embodiments described above are merely exemplary, such as the division of the unit, Ke Yiwei
A kind of logical function partition, there may be another division manner in actual implementation, for example, multiple units or components can combine or
Person is desirably integrated into another system, or some features can be ignored or not executed.Another point, shown or discussed is mutual
Between coupling, direct-coupling or communication connection can be through some interfaces, the INDIRECT COUPLING or communication link of unit or module
It connects, can be electrical or other forms.
The unit as illustrated by the separation member may or may not be physically separated, aobvious as unit
The component shown may or may not be physical unit, it can and it is in one place, or may be distributed over multiple
On unit.It can some or all of the units may be selected to achieve the purpose of the solution of this embodiment according to the actual needs.
It, can also be in addition, the functional units in various embodiments of the present invention may be integrated into one processing unit
It is that each unit physically exists alone, can also be integrated in one unit with two or more units.Above-mentioned integrated list
Member both can take the form of hardware realization, can also realize in the form of software functional units.
If the integrated unit is realized in the form of SFU software functional unit and sells or use as independent product
When, it can store in a computer readable storage medium.Based on this understanding, technical solution of the present invention is substantially
The all or part of the part that contributes to existing technology or the technical solution can be in the form of software products in other words
It embodies, which is stored in a storage medium, including some instructions are used so that a computer
Equipment (can for personal computer, server or network equipment etc.) execute each embodiment the method for the present invention whole or
Part steps.And storage medium above-mentioned includes: that USB flash disk, read-only memory (ROM, Read-Only Memory), arbitrary access are deposited
Reservoir (RAM, Random Access Memory), mobile hard disk, magnetic or disk etc. be various to can store program code
Medium.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (10)
1. a kind of power-line carrier communication method characterized by comprising
When detecting power frequency zero cross signal, the pulse-modulated signal of predeterminated frequency is generated, wherein the power frequency zero cross signal refers to
Be in AC system, when waveform from positive half cycle to negative half period convert when, by the signal detected when zero-bit；
Primary carrier signal is modulated using the pulse-modulated signal, so that signal coupling circuit believes modulated carrier wave
Number it is coupled to the high pressure power frequency electric line of force；
Modulated carrier signal is demodulated in the corresponding same power frequency zero crossing of the power frequency zero cross signal, wherein
The modulated carrier signal is coupled from the high pressure power frequency electric line of force by the signal coupling circuit and is obtained；
Wherein, modulated carrier signal is demodulated in the corresponding same power frequency zero crossing of the power frequency zero cross signal,
Include:
The carrier signal after being filtered is sampled by analog-to-digital conversion device；
Digital filtering and Fast Fourier Transform (FFT) are carried out to the carrier signal that sampling obtains, to solve to the carrier signal
It adjusts, obtains the primary carrier signal；
The predeterminated frequency is 2.6KHz.
2. the method according to claim 1, wherein in the signal coupling circuit from the high pressure power frequency electric line of force
Before coupling obtains modulated carrier signal, the method also includes:
Modulated carrier signal is couple the high pressure power frequency electric line of force by the coupling circuit.
3. according to the method described in claim 2, it is characterized in that, in the signal coupling circuit from the high pressure power frequency electric line of force
After coupling obtains modulated carrier signal, the method also includes:
The carrier signal is filtered, wherein the filtering processing includes: active power filtering, passive filtering and signal
Amplification.
4. a kind of power-line carrier communication system characterized by comprising
Power frequency zero cross detection circuit generates power frequency zero cross signal, wherein the power frequency zero passage for carrying out power frequency zero passage detection
Signal refers in AC system, when waveform is converted from positive half cycle to negative half period, by the signal detected when zero-bit；
Signal coupling circuit is connected with processor and the high pressure power frequency electric line of force respectively, the carrier wave for modulating the processor
Signal is coupled to the high pressure power frequency electric line of force of transmitting terminal, and couples the place for the carrier signal that the high pressure power frequency electric line of force is transmitted
Manage device；
The processor is connected with the power frequency zero cross detection circuit, detects that the power frequency zero cross detection circuit mentions for working as
When the power frequency zero cross signal of confession, the pulse-modulated signal for generating predeterminated frequency is modulated primary carrier signal, and in the work
The corresponding same power frequency zero crossing of frequency zero cross signal carries out the modulated carrier signal that the signal coupling circuit couples
Demodulation；
The processor includes:
Modulation unit, the pulse-modulated signal for generating predeterminated frequency are modulated primary carrier signal；
Demodulating unit is connected with the signal coupling circuit, and the carrier signal for coupling to the signal coupling circuit carries out
Demodulation；
The demodulating unit includes:
Analog-to-digital conversion subelement, is connected with filter circuit, carries out analog-to-digital conversion for filtered carrier signal；
Data filtering subelement is connected with the analog-to-digital conversion subelement, for carrying out digital filtering to digital carrier signal；
Fast Fourier Transform (FFT) subelement is connected with the data filtering subelement, for being believed according to filtered digital carrier
Number demodulate CF signal；
Decoding subunit is connected with the Fast Fourier Transform (FFT) subelement, described for being decoded according to the CF signal
Primary carrier signal；
The predeterminated frequency is 2.6KHz.
5. system according to claim 4, which is characterized in that the power frequency zero cross detection circuit includes:
Diode is connected with the high pressure power frequency electric line of force, leads when positive value for the alternating current in the high pressure power frequency electric line of force
It is logical；
Optocoupler is connected with the diode, for being connected power supply and ground in the case where the diode current flow；
The power supply is connected with the optocoupler；
Output end, for exporting corresponding signal in the case where the power supply is connected with ground, otherwise output is zero；
Wherein, the power frequency zero cross signal is that the signal of output end output jumps signal when becoming zero.
6. system according to claim 5, which is characterized in that the optocoupler includes:
The anode of light emitting diode, the light emitting diode is connected with the cathode of the diode, cathode and the diode
Anode is connected, and is same as being connected in the case where the diode current flow；
Phototriode, the emitter ground connection of the phototriode, collector is connected with the output end, in the hair
Optical diode is connected in the case where being connected；
Wherein, the power supply is connected to the collector of the phototriode.
7. system according to claim 6, which is characterized in that the power frequency zero cross detection circuit further include:
First divider resistance is connected between the cathode of the diode and the high pressure power frequency electric line of force, for the height
The power supply that the pressure power frequency electric line of force provides is divided；
Second divider resistance is connected between the power supply and the collector of the phototriode；
Third divider resistance is connected between second divider resistance and the output end, for electric with second partial pressure
Resistance divides the power supply.
8. system according to claim 4, which is characterized in that the signal coupling circuit includes:
Coupling transformer, the both ends of the first winding of the coupling transformer are connected to the high pressure power frequency electric line of force, second around
The both ends of group are connected to the processor；
Capacitor and resistance are connected between the coupling transformer and the high pressure power frequency electric line of force, for carrier signal
It is filtered.
9. system according to claim 8, which is characterized in that the signal coupling circuit be also used to carry out power frequency high voltage every
From.
10. system according to claim 4, which is characterized in that the system also includes:
Filter circuit, including passive filtering unit, active power filtering unit and amplifying unit are sequentially connected to the signal coupling electricity
Between road and the processor, default load is coupled in the carrier signal of the processor for filtering out the signal coupling circuit
Noise other than wave frequency rate, and amplify the carrier signal.
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| CN107317597A (en) * | 2017-06-29 | 2017-11-03 | 国网福建省电力有限公司 | A kind of field Radio Network System |
| CN108199747A (en) * | 2018-01-04 | 2018-06-22 | 哈尔滨理工大学 | A kind of direct current photovoltaic power carrier wave communication device |
| CN111384780A (en) * | 2020-03-24 | 2020-07-07 | 佳源科技有限公司 | High-speed reliable Internet of things power broadband carrier High Performance Liquid Chromatography (HPLC) system |
| CN114442519B (en) * | 2021-12-20 | 2023-09-22 | 南京铁道职业技术学院 | Rail vehicle slides trouble analog system |
| CN114598358B (en) * | 2022-03-21 | 2023-05-30 | 广东电网有限责任公司 | Power line carrier communication system |
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