CN111654312B - Power line carrier communication equipment - Google Patents
Power line carrier communication equipment Download PDFInfo
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- CN111654312B CN111654312B CN202010687514.4A CN202010687514A CN111654312B CN 111654312 B CN111654312 B CN 111654312B CN 202010687514 A CN202010687514 A CN 202010687514A CN 111654312 B CN111654312 B CN 111654312B
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/04—Control of transmission; Equalising
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Abstract
The voltage of the metering carrier signal and the voltage of the non-metering carrier signal generated or received by the metering carrier signal and the non-metering carrier signal are respectively positioned at two sides of a reference voltage, the metering carrier signal in 1 information element period and any one or more non-metering carrier signals with the same time length cannot be completely neutralized, the non-metering carrier signal in 1 information element period and any one or more metering carrier signals with the same time length cannot be completely neutralized, and the period of the metering carrier signal and the period of the non-metering carrier signal are obviously different from the power frequency loaded on a power line. The invention can clearly identify the metering carrier signal and the non-metering carrier signal when the same power line is simultaneously loaded with the metering carrier signal and the non-metering carrier signal.
Description
Technical Field
The invention relates to the technical field of power line carriers, in particular to power line carrier communication equipment.
Background
In communication technology, a carrier wave (carrier signal or carrier) is an electric wave generated by an oscillator and transmitted over a communication channel, and is modulated to transmit voice or other information. The carrier frequency is usually higher than the frequency of the input signal, which is a high frequency signal that is modulated onto a high frequency carrier as if it were riding a train of high-speed rails or an airplane, and then transmitted and received. A carrier wave is the physical basis and vehicle upon which information (voice and data) is conveyed. The unmodulated periodic oscillating signal is referred to as a carrier wave, which may be a sine wave or a non-sine wave (e.g., a periodic pulse train), and the carrier wave is modulated and referred to as a modulated signal, which contains the full-wave characteristics of the modulated signal. The frequency of the sinusoidal carrier is generally required to be much higher than the bandwidth of the modulated signal, otherwise aliasing occurs, distorting the transmitted signal.
Power Line Communication (PLC) is a special Communication method for voice or data transmission using a Power Line as an information transmission medium. Because the power carrier technology can utilize the existing power line, the laying cost is extremely low. The signals to be transmitted in the power system comprise a communication signal of a metering device and a communication signal of a non-metering device, wherein the communication signal of the metering device has extremely high requirement on the accuracy of data transmission, and the communication signal of the non-metering device needs to be prevented from interfering with the communication signal of the metering device.
Disclosure of Invention
The invention aims to provide power line carrier communication equipment to solve the technical problem that when a metering signal and a non-metering signal are simultaneously loaded on the same power line, the metering signal and the non-metering signal interfere with each other to cause poor communication quality of the metering signal.
The technical scheme of the invention is as follows:
a power line carrier communication device comprises a metering carrier signal modulation unit, a metering carrier signal receiving unit, a non-metering carrier signal modulation unit and a non-metering carrier signal receiving unit, wherein the metering carrier signal modulation unit is used for encoding a first metering signal and outputting a metering carrier signal; the metering carrier signal receiving unit is used for only filtering the metering carrier signal and outputting a second metering signal; the non-metering carrier signal modulation unit is used for encoding a first non-metering signal and outputting a non-metering carrier signal; the non-metering carrier signal receiving unit is used for only filtering non-metering carrier signals and outputting second non-metering signals; the voltage of the metering carrier signal and the voltage of the non-metering carrier signal are respectively positioned at two sides of the reference voltage, the metering carrier signal in 1 information element period and any one or more non-metering carrier signals with the same time length cannot be completely neutralized, the non-metering carrier signal in 1 information element period and any one or more metering carrier signals with the same time length cannot be completely neutralized, and the period of the metering carrier signal and the period of the non-metering carrier signals are obviously different from the power frequency loaded on a power line.
Preferably, the metering carrier signal modulation unit includes a first carrier signal encoder and a first rectifier connected in sequence, and the non-metering carrier signal modulation unit includes a second carrier signal encoder, a second rectifier and a voltage inverter connected in sequence.
Preferably, the period of the metering carrier signal is significantly different from the period of the non-metering carrier signal.
Preferably, the measurement carrier signal receiving unit includes a first filter and a first voltage limiter connected in sequence, and the first voltage limiter is used for passing the measurement carrier signal on the reference voltage side; the non-metering carrier signal receiving unit comprises a second filter and a second voltage limiter which are sequentially connected, and the second voltage limiter is used for passing the non-metering carrier signal on the other side of the reference voltage.
Further preferably, the first voltage limiter comprises a first one-way conduction component for allowing the metering carrier signal on the reference voltage side to pass through; the second voltage limiter comprises a second one-way conduction component used for allowing the non-metering carrier signal on the other side of the reference voltage to pass through.
Preferably, the period of the metering carrier signal is significantly different from the period of the non-metering carrier signal.
The invention has the beneficial effects that:
1. in the power carrier communication equipment, the voltages of the metering carrier signals and the non-metering carrier signals are respectively positioned at two sides of the reference voltage, the metering carrier signals in 1 information element period and any one or more non-metering carrier signals with the same time length cannot be completely neutralized, the non-metering carrier signals in 1 information element period and any one or more metering carrier signals with the same time length cannot be completely neutralized, so that the metering carrier signals and the non-metering carrier signals can be reflected on the current change on a power line, and the metering carrier signals and the non-metering carrier signals can be obviously distinguished by means of the reference voltage. The period of the metering carrier signal and the period of the non-metering carrier signal are obviously different from the power frequency loaded on the power line, so that the metering carrier signal and the non-metering carrier signal can be smoothly taken out from the power line. The power carrier communication equipment can clearly identify the metering signals and the non-metering signals when the metering carrier signals and the non-metering carrier signals are simultaneously loaded on the same power line.
Drawings
Fig. 1 is a schematic diagram of a power line carrier communication device to which the present invention is applied.
Fig. 2 is a configuration diagram of a power line carrier communication device transmitting a metering carrier communication signal and transmitting a non-metering carrier communication signal according to the present invention.
The reference numbers indicate that A11-a first carrier signal encoder, A12-a first rectifier, A21-a second carrier signal encoder, A22-a second rectifier, A23-a voltage inverter, L10-inductor, L20-inductor, C11-capacitor, C12-capacitor, C21-capacitor, C22-capacitor, R21-resistor, R22-resistor, D21-a first voltage limiter, and D22-a second voltage limiter.
In FIG. 1, voltage UinFor voltage at input end of power line, voltage UoutFor the output terminal voltage of the power line, the frequency f is the power frequency of the power line, the frequency f1Is the frequency of the first carrier signal encoder A11, frequency f2Is the frequency, voltage U, of the second carrier signal encoder A210Is a reference voltage, voltage
Voltage is the conduction voltage difference of diode D21
Is the conduction voltage difference of the diode D22.
Detailed Description
The present invention is described below in terms of embodiments in conjunction with the accompanying drawings to assist those skilled in the art in understanding and implementing the present invention. Unless otherwise indicated, the following embodiments and technical terms therein should not be understood to depart from the background of the technical knowledge in the technical field.
In the field of power carrier, different physical quantities can be distinguished from each other, which means two or more physical quantities that can be distinguished by an electrical device or component.
The invention discloses power carrier communication equipment which comprises a metering carrier signal modulation unit, a metering carrier signal receiving unit, a non-metering carrier signal modulation unit and a non-metering carrier signal receiving unit.
The metering carrier signal modulation unit is used for encoding a first metering signal and outputting a metering carrier signal;
the non-metering carrier signal modulation unit is used for encoding a first non-metering signal and outputting a non-metering carrier signal;
the metering carrier signal receiving unit is used for only filtering the metering carrier signal and outputting a second metering signal;
the non-metering carrier signal receiving unit is used for only filtering non-metering carrier signals and outputting second non-metering signals;
the voltages of the metering carrier signal and the non-metering carrier signal are respectively positioned on two sides of the reference voltage. The reference voltage may be a voltage value or a voltage interval, and generally, the reference voltage is preferably 0V, that is, a ground voltage.
The period of the metering carrier signal and the period of the non-metering carrier signal are both obviously different from the power frequency loaded on the power line, the metering carrier signal in 1 information element period and any one or more non-metering carrier signals with the same time length cannot be completely neutralized, and the non-metering carrier signal in 1 information element period and any one or more metering carrier signals with the same time length cannot be completely neutralized.
Because the carrier wave may have one or more metering carrier wave signals and one or more non-metering carrier wave signals on the same power line, each metering carrier wave signal also generates higher harmonics on the power line, and each non-metering carrier wave signal also generates higher harmonics on the power line. Taking 1 information element as an example of binary representation, each type of metering carrier signal is divided into a signal representing "0" information and a signal representing "1" information. Therefore, the fact that the metering carrier signals in 1 information element period and various non-metering carrier signals with the same time length cannot be completely neutralized means that various non-metering carrier signals loaded on a power line and secondary signals derived from the non-metering carrier signals with the same time length as the metering carrier signals in 1 information element period cannot be completely neutralized at the same time; the fact that the non-metering carrier signals in 1 information element period and various metering carrier signals with the same time length cannot be completely neutralized means that various metering carrier signals loaded on a power line and secondary signals derived from the metering carrier signals with the same time length as the non-metering carrier signals in 1 information element period cannot be completely neutralized at the same time.
In the power carrier field, the main purpose of the power line is to transmit power, the secondary purpose is to transmit signals, and the voltage value transmitted by the power line needs to be stabilized in a certain range, such as the allowable variation range 198V-235V of 220V ac and the allowable variation range 342V-418V of 380V ac, so that the voltage of the power carrier signal is limited within a proper range to the output voltage influence response of the power line. Therefore, generally, the period of the metering carrier signal and the period of the non-metering carrier signal are both far lower than the power frequency loaded on the power line, and the absolute value of the extreme voltage of the metering carrier signal and the absolute value of the extreme voltage of the non-metering carrier signal are both far lower than the absolute value of the extreme power transmission voltage loaded on the power line.
Currently, in the power carrier field, the power carrier voltage is up to 48V.
Of course, the power carrier technology may be applied to the dc transmission power line.
Preferably, referring to fig. 1, the metering carrier signal modulating unit includes a first carrier signal encoder a11 and a first rectifier a12 connected in series, and the non-metering carrier signal modulating unit includes a second carrier signal encoder a21, a second rectifier a22 and a voltage inverter a23 connected in series.
Preferably, the period of the metering carrier signal is significantly different from the period of the non-metering carrier signal.
Preferably, the measurement carrier signal receiving unit includes a first filter and a first voltage limiter connected in sequence, and the first voltage limiter is configured to pass the measurement carrier signal on the reference voltage side. Further preferably, the first voltage limiter comprises a first unidirectional conducting component for allowing the metering carrier signal on the reference voltage side to pass through. The first one-way conducting device shown in fig. 1 is a diode D21, and the first filter is a filter composed of an inductor L20 and a capacitor C21.
Preferably, the non-metering carrier signal receiving unit includes a second filter and a second voltage limiter connected in sequence, and the second voltage limiter is used for passing the non-metering carrier signal on the other side of the reference voltage. Further preferably, the second voltage limiter comprises a second one-way conduction component for allowing the non-metering carrier signal on the other side of the reference voltage to pass through. The second unidirectional conducting device shown in fig. 1 is a diode D22, and the second filter is a filter composed of an inductor L20 and a capacitor C22.
Preferably, the period of the metering carrier signal is significantly different from the period of the non-metering carrier signal.
FIG. 1 is a schematic diagram of a power carrier encoding module and a power carrier decoding module to which the present invention is applied, in which a voltage U is appliedinFor voltage at input end of power line, voltage UoutFor the output terminal voltage of the power line, the frequency f is the power frequency of the power line, the frequency f1Is the frequency of the first carrier signal encoder A11, frequency f2Is the frequency, voltage U, of the second carrier signal encoder A210Is a reference voltage, voltage
Voltage is the conduction voltage difference of diode D21
Is the conduction voltage difference of the diode D22.
Fig. 2 shows a power line carrier communication device of the present invention transmitting a metering carrier communication signal and transmitting a non-metering carrier communication signal. In the figure, the signal representing the first information element of the measurement carrier signal is a positive double-half sine wave, the signal representing the second information element of the measurement carrier signal is null, and the frequency of the signal representing the first information element is the same as the frequency of the signal representing the second information element. The signal representing the third information element of the unmeasured carrier signal is a negative double-half sine wave, the signal representing the fourth information element of the unmeasured carrier signal is null, and the frequency of the signal representing the third information element is the same as the frequency of the signal representing the fourth information element. Overall, the signal representing the first information element differs significantly in both frequency and amplitude from the signal representing the third information element.
The invention is described in detail above with reference to the figures and examples. It should be understood that in practice it is not intended to be exhaustive of all possible embodiments, and the inventive concepts herein are presented by way of illustration. Without departing from the inventive concept of the present invention and without any creative effort, a person skilled in the art should, in all of the embodiments, make optional combinations of technical features and experimental changes of specific parameters, or make a routine replacement of the disclosed technical means by using the prior art in the technical field to form a specific implementation manner, which belongs to the content implicitly disclosed by the present invention.
Claims (2)
1. A power line carrier communication device comprises a metering carrier signal modulation unit, a metering carrier signal receiving unit, a non-metering carrier signal modulation unit and a non-metering carrier signal receiving unit, wherein the metering carrier signal modulation unit is used for encoding a first metering signal and outputting a metering carrier signal; the metering carrier signal receiving unit is used for only filtering the metering carrier signal and outputting a second metering signal; the non-metering carrier signal modulation unit is used for encoding a first non-metering signal and outputting a non-metering carrier signal; the non-metering carrier signal receiving unit is used for only filtering non-metering carrier signals and outputting second non-metering signals; the method is characterized in that: the voltage of the metering carrier signal and the voltage of the non-metering carrier signal are respectively positioned at two sides of a reference voltage, the metering carrier signal in 1 information element period and any one or more non-metering carrier signals with the same time length cannot be completely neutralized, the non-metering carrier signal in 1 information element period and any one or more metering carrier signals with the same time length cannot be completely neutralized, the period of the metering carrier signal and the period of the non-metering carrier signal are different from the power frequency of the metering carrier signal loaded on a power line, the metering carrier signal modulation unit comprises a first carrier signal encoder and a first rectifier which are sequentially connected, and the non-metering carrier signal modulation unit comprises a second carrier signal encoder, a second rectifier and a voltage reverser which are sequentially connected;
the metering carrier signal receiving unit comprises a first filter and a first voltage limiter which are sequentially connected, and the first voltage limiter is used for passing the metering carrier signal on one side of the reference voltage; the non-metering carrier signal receiving unit comprises a second filter and a second voltage limiter which are sequentially connected, and the second voltage limiter is used for passing through a non-metering carrier signal on the other side of the reference voltage;
the first voltage limiter comprises a first one-way conduction component used for allowing a metering carrier signal on one side of a reference voltage to pass through; the second voltage limiter comprises a second one-way conduction component used for allowing the non-metering carrier signal on the other side of the reference voltage to pass;
the metering carrier signals in 1 information element period and any one or more non-metering carrier signals with the same time length cannot be completely neutralized, the metering carrier signals can be reflected on the current change on the power line, the non-metering carrier signals in 1 information element period and any one or more metering carrier signals with the same time length cannot be completely neutralized, and the non-metering carrier signals can be reflected on the current change on the power line.
2. The power carrier communication device of claim 1, wherein: the period of the metering carrier signal is different from the period of the non-metering carrier signal.
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| CN202010687514.4A CN111654312B (en) | 2020-07-16 | 2020-07-16 | Power line carrier communication equipment |
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| CN202010687514.4A CN111654312B (en) | 2020-07-16 | 2020-07-16 | Power line carrier communication equipment |
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| CN111654312B true CN111654312B (en) | 2021-07-23 |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101834633A (en) * | 2009-03-09 | 2010-09-15 | 江苏林洋电子股份有限公司 | Power line carrier wave meter based on tri-state impulse displacement phase modulation and communication method |
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| US3978403A (en) * | 1974-05-06 | 1976-08-31 | Minnesota Mining And Manufacturing Company | Automatic tracking signal analyzer |
| US8681757B2 (en) * | 2009-11-09 | 2014-03-25 | Lg Electronics Inc. | Method and apparatus for transmitting PLCP frame in wireless local area network system |
| CN108173799B (en) * | 2017-11-29 | 2020-08-07 | 深圳市力合微电子股份有限公司 | Power line carrier communication method based on frequency domain processing |
| CN109379108A (en) * | 2018-11-01 | 2019-02-22 | 中山市广研泰电气有限公司 | A kind of electric appliance based on power line carrier, PLC, electric control system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101834633A (en) * | 2009-03-09 | 2010-09-15 | 江苏林洋电子股份有限公司 | Power line carrier wave meter based on tri-state impulse displacement phase modulation and communication method |
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