CN102571152A - Control device of transmitted power of power line carrier communication - Google Patents
Control device of transmitted power of power line carrier communication Download PDFInfo
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- CN102571152A CN102571152A CN2012100544035A CN201210054403A CN102571152A CN 102571152 A CN102571152 A CN 102571152A CN 2012100544035 A CN2012100544035 A CN 2012100544035A CN 201210054403 A CN201210054403 A CN 201210054403A CN 102571152 A CN102571152 A CN 102571152A
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Abstract
The invention provides a control device of transmitted power of power line carrier communication. The control device comprises an adjustable gain amplification unit, a power amplification unit, a signal coupling circuit, and a receiving unit throughout connected with the signal coupling circuit, wherein the receiving unit is used for detecting the signal-to-noise ratio of a channel and power levels of transmitted signals through the coupling circuit, and feeding back the signal-to-noise information of the channel to the adjustable gain amplification unit. Therefore, the gain is adjusted by the adjustable gain amplification unit to control the power levels of the transmitted signal. Compared with the prior art, the control device of the transmitted power of power line carrier communication dispenses with an extra detection circuit, and has the advantages of simple structure, low system complexity and cost conservation.
Description
Technical field
The present invention relates to a kind of power-line carrier communication, particularly a kind of control device of power line carrier, PLC transmitted power.
Background technology
Power-line carrier communication is that a kind of power line that utilizes comes the communication mode of transmitting data information as communication medium, and its mode with carrier wave realizes the transport communication of data, voice, video etc.This technology is widely used in industry fields such as communication, electric power, Industry Control now, and this communication technology is a kind of advanced person's in the current communications industry a technology.
Power-line carrier communication generally comprises: by the hv transmission line of 35kV and the above electric pressure high-tension electricity line carrier communication as communication medium; By the middle pressure transmission line of 10kV electric pressure medium voltage electricity line carrier communication as communication medium; And by the low pressure transmission line of 380V or 220V low-voltage powerline carrier communication as communication medium.
Traditional power line carrier communication mainly utilizes the transmission channel of hv transmission line as high-frequency signal, only is confined to transmit remote control signal etc., narrow in application range, and transmission rate is lower.At present, along with the continuous development and the needs of society of power line carrier technology, power line carrier, PLC is turning to and is adopting low-voltage network to carry out carrier communication, makes the technological development of low-voltage powerline carrier communication and application situation in the ascendant occur.
Compare with other communication technologys, the right channel condition of power line carrier communication demand side has following characteristic: time variation is strong, and presents the cyclostationarity that changes with power frequency component; Fading channel is big; The intensity of interference signal and noise signal is very big, and signal to noise ratio and signal interference ratio are relatively poor.Therefore, in power line carrier communication, the power control of sending signal just seems quite important.
In the prior art, the patent No. is that the United States Patent (USP) of US4843345 provides a kind of output stage that the power line carrier signal has the automatic electric-level circuit in sending that is applied to.In said patent document, provide a kind of power line carrier to send the automatic level control circuit (referring to Fig. 1) of signal.As shown in Figure 1, said automatic level control circuit comprises: variable gain unit F1, the power line that is connected with variable gain unit F1 drives power amplifier F2, drives the coupling circuit that power amplifier F2 is connected with power line.When not having carrier signal to send, the input of comparator K is biased in two common mode electrical level V1, V2 is last.When carrier signal is sent, export signal to v1, if the end of oppisite phase voltage V1+v1 of comparator K is greater than positive terminal voltage V2 by resistance R 3, capacitor C 3 coupling units; Then diode D conducting; The voltage of capacitor C 4 descends, variable gain unit F1 reductions that gain, the decline of control transmission signal amplitude; Otherwise the variable gain unit F1 rising that gains, control are sent signal amplitude and are risen.But above-mentioned patent has adopted special adjunct circuit that the output signal of power amplifier is detected, and has increased the complexity of application circuit.
Summary of the invention
The object of the present invention is to provide a kind of control device of power line carrier, PLC transmitted power, be used for solving prior art complicated circuit, cost than problems such as height.
Solve above-mentioned purpose and other purposes; The present invention provides a kind of control device of power line carrier, PLC transmitted power; Comprise: adjustable gain amplifying unit, power amplification unit, signal coupling circuit and remain the receiving element that is connected with said signal coupling circuit; Be used for detecting the signal to noise ratio and the power levels of transmitted signals of channel through said coupling circuit; And,, control power levels of transmitted signals by the adjustment that gains of said adjustable gain amplifying unit with the signal to noise ratio feedback information of said channel to said adjustable gain amplifying unit.
Alternatively, said signal coupling circuit comprises the electric current coupling coil, and the elementary across of said electric current coupling coil is between a pair of power line cables, and secondary have earth terminal and be used to be connected in the link of said receiving element and said power amplification unit.
Alternatively, between said electric current coupling coil and said power amplification unit, also comprise coupling capacitance.
Alternatively, the adjustment that gains of said adjustable gain amplifying unit comprises and increases gain or reduce gain; When receiving element detects the signal to noise ratio decline of channel, increase gain by said adjustable gain amplifying unit; When receiving element detects the signal to noise ratio rising of channel, reduce gain by said adjustable gain amplifying unit.
Alternatively, the desired value of said gain adjustment has between stagnant regions.
The control device of power line carrier, PLC transmitted power of the present invention; Provide with signal coupling circuit and remained the receiving element that is connected; Thereby utilized the characteristics of half-duplex operation in the power line carrier communication, both can detect, also can detect the signal to noise ratio of channel through said coupling circuit to power levels of transmitted signals; Thereby gain adjustment in view of the above, the control power levels of transmitted signals.With respect to prior art, need not the additional testing circuit of extra increase, have simple in structure, system complexity is lower and the advantage of cost savings cost.
In addition, in gradual power line channel, characteristics of signals is carried out the disconnected control method of anticipation, can either give full play to the transmitted power potentiality of power amplifier, can carry out multilist at concentrator again and disturb between the minimizing table when checking meter, improve the success rate of checking meter.
Have, power amplifier sends signal and carries out dynamic control procedure again, but not static a certain fixed level value, whole table has better Electro Magnetic Compatibility ability.
Description of drawings
Fig. 1 is the automatic level control circuit that a kind of power line carrier that the american documentation literature of US4843345 provides is sent signal for the patent No..
Fig. 2 is the control device circuit structure diagram in one embodiment of power line carrier, PLC transmitted power of the present invention.
Fig. 3 shows the data structure diagram in the control device of power line carrier, PLC transmitted power of the present invention.
Embodiment
Exist complicated circuit, cost than problems such as height in view of having the Technology Need additional configuration additional detection circuit of controlling to the power line carrier power levels of transmitted signals now; Inventor of the present invention improves prior art; A kind of control device of power line carrier, PLC transmitted power has been proposed; Provide with signal coupling circuit and remained the receiving element that is connected; Can detect the signal to noise ratio and the power levels of transmitted signals of channel simultaneously, thereby gain adjustment in view of the above, the control power levels of transmitted signals.With respect to prior art, need not the additional testing circuit of extra increase, have simple in structure, system complexity is lower and the advantage of cost savings cost.
Below through specific instantiation execution mode of the present invention is described, those skilled in the art can understand other advantages of the present invention and effect easily by the content that this specification disclosed.The present invention can also implement or use through other different embodiment, and each item details in this specification also can be based on different viewpoints and application, carries out various modifications or change under the spirit of the present invention not deviating from.
Need to prove; The diagram that is provided in the present embodiment is only explained basic conception of the present invention in a schematic way; Satisfy only show in graphic with the present invention in relevant assembly but not component count, shape and plotted when implementing according to reality; Kenel, quantity and the ratio of each assembly can be a kind of random change during its actual enforcement, and its assembly layout kenel also maybe be more complicated.
See also Fig. 2, shown the control device circuit structure diagram in one embodiment of power line carrier, PLC transmitted power of the present invention.As shown in Figure 2; The control device of said power line carrier, PLC transmitted power comprises: adjustable gain amplifying unit 201 (Variable Gain Amplifier; VGA), power amplification unit 202 (Power Amplifier, PA), signal coupling circuit 203 and receiving element 204.The output of adjustable gain amplifying unit 201 is connected with the input of power amplification unit 202, and the signal coupling circuit 203 that is output in of power amplification unit 202 connects, and receiving element 204 is connected with signal coupling circuit 203.
Especially, in the present embodiment, no matter be in signal reception stage or signal transmission stage; Receiving element 204 all is constantly to be connected in signal coupling circuit 203 and not break off; Thereby both can detect, and also can detect the signal to noise ratio of channels, and with signal to noise ratio feedback information to the adjustable gain amplifying unit 201 of said channel through signal coupling circuit 203 to power levels of transmitted signals; By adjustable gain amplifying unit 201 adjustment that gains, the control power levels of transmitted signals.Particularly, adjustable gain amplifying unit 201 gains to adjust and comprises the increase gain or reduce gain: when receiving element 204 detects the signal to noise ratio decline (that is, the decay of channel rising) of channel, by the 201 increase gains of adjustable gain amplifying unit; When receiving element 204 detects the signal to noise ratio rising (that is, the decay of channel reduces) of channel, reduce gain by adjustable gain amplifying unit 201.In addition, the desired value of said gain adjustment should have between certain stagnant regions, and generally speaking, the scope in said sluggish space is 0dB to 10dB, and certainly not as limit, in some cases, said sluggish space also can be other scopes, for example greater than 10dB.
Below the application of the control device of power line carrier, PLC transmitted power of the present invention is elaborated.
Generally speaking, consider low bandwidth and high reliable communication requirement, what actual power-line carrier communication system adopted basically is half-duplex operation.That is: on the one hand, when power amplifier sent signal, receive path was in idle state, can accomplish through the analog to digital converter ADC and the correlated digital functional circuit of receive path the power detection of power amplifier, simultaneously the transmitting terminal channel quality was detected; On the other hand, when AFE(analog front end) received signal, sending power amplifier was to be in off state, but can control power amplifier equally.
Become when the impedance of power line is, that is to say that the signal on the communication channel always is in upset condition, but it is a gradual process.In addition; In power-line carrier communication system, before the data of needs transmission, for each packet provides leading (preamble) signal (as shown in Figure 3); The preamble signal tends to comprise that some are used for the correct information that receives; Such as channel coding method, scrambler initial condition, data packet length etc.The meeting that has is that a training sequence is used for synchronously channel estimating, frequency offset correction etc.Utilize the preamble signal, can be used to make receiving element to break away from wait state.Utilizing the signal on the above-mentioned communication channel is gradual characteristics, in the preamble stage that receives signal, judges the receiving terminal channel quality; In the ensuing transmission stage, change the drive level that sends power amplifier adaptably.
Describe with next instantiation: utilize the preamble signal to judge the signal quality that receives; When signal quality is relatively poor, (for example require signal to noise ratio greater than 6dB; This fashion does not reach); Receiver can not proper solution access useful signal so; Can think two kinds of reasons are arranged: a kind of transmitting terminal signal of the other side's of being receiving element strong inadequately (fading channel big and cause this locality not receive information), another kind of reason are the transmitting terminal signals strong (fading channel causes the other side not receive information greatly) inadequately of local reception unit; Afterwards, transmitting terminal will increase gain and then improve and send signal level, in sending signal, also comprise the information that needs the other side to improve transmitted power.The presetting method that improve to send signal level is to be that the signal to noise ratio that calculated according to the preamble signal in the bag with last number and the difference of desired value are as the criterion; Suppose that the channel maximum attenuation is 40dB; Adopt BPSK (Binary Phase Shift Keying, binary phase shift keying) modulation system, the error rate to be lower than 10
-5The signal to noise ratio snr thresholding of demodulation (no chnnel coding) be 6dB, so, the signal to noise ratio of transmitting terminal gets final product greater than 46dB (40dB+6dB).Excessive signal not only consumes more system power dissipation, when concentrator is communicated by letter with multilist simultaneously, also can cause signal to disturb, and reduces the communication success rate.Be noted that; In the gain adjustment process; The setting of desired value should have between certain stagnant regions; For example calculating gained transmitting terminal signal to noise ratio need be greater than 46dB, and so actual transmission gain adjustment at 46dB to 52dB, is disturbed the frequent adjustment that causes to the output snr settings to avoid interchannel noise.
The control device of power line carrier, PLC transmitted power of the present invention; Provide with signal coupling circuit and remained the receiving element that is connected; Thereby utilized the characteristics of half-duplex operation in the power line carrier communication, both can detect, also can detect the signal to noise ratio of channel through said coupling circuit to power levels of transmitted signals; Thereby gain adjustment in view of the above, the control power levels of transmitted signals.With respect to prior art, need not the additional testing circuit of extra increase, have simple in structure, system complexity is lower and the advantage of cost savings cost.
In addition, in gradual power line channel, characteristics of signals is carried out the disconnected control method of anticipation, can either give full play to the transmitted power potentiality of power amplifier, can carry out multilist at concentrator again and disturb between the minimizing table when checking meter, improve the success rate of checking meter.
Have, power amplifier sends signal and carries out dynamic control procedure again, but not static a certain fixed level value, whole table has better Electro Magnetic Compatibility ability.
The foregoing description is just listed expressivity principle of the present invention and effect is described, but not is used to limit the present invention.Any personnel that are familiar with this technology all can make amendment to the foregoing description under spirit of the present invention and scope.Therefore, rights protection scope of the present invention should be listed like claims.
Claims (5)
1. the control device of a power line carrier, PLC transmitted power; Comprise: adjustable gain amplifying unit, power amplification unit and signal coupling circuit; It is characterized in that; Also comprise: remain the receiving element that is connected with said signal coupling circuit, be used for detecting the signal to noise ratio and the power levels of transmitted signals of channel through said coupling circuit, and with signal to noise ratio feedback information to the said adjustable gain amplifying unit of said channel; By the adjustment that gains of said adjustable gain amplifying unit, the control power levels of transmitted signals.
2. the control device of power line carrier, PLC transmitted power according to claim 1; It is characterized in that; Said signal coupling circuit comprises the electric current coupling coil; The elementary across of said electric current coupling coil is between a pair of power line cables, and secondary have earth terminal and be used to be connected in the link of said receiving element and said power amplification unit.
3. the control device of power line carrier, PLC transmitted power according to claim 2 is characterized in that, between said electric current coupling coil and said power amplification unit, also comprises coupling capacitance.
4. the control device of power line carrier, PLC transmitted power according to claim 1 is characterized in that, said adjustable gain amplifying unit gains to adjust and comprises the increase gain or reduce gain; When receiving element detects the signal to noise ratio decline of channel, increase gain by said adjustable gain amplifying unit; When receiving element detects the signal to noise ratio rising of channel, reduce gain by said adjustable gain amplifying unit.
5. the control device of power line carrier, PLC transmitted power according to claim 4 is characterized in that, the desired value of said gain adjustment has between stagnant regions.
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| CN2012100544035A CN102571152A (en) | 2012-03-02 | 2012-03-02 | Control device of transmitted power of power line carrier communication |
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| CN2012100544035A CN102571152A (en) | 2012-03-02 | 2012-03-02 | Control device of transmitted power of power line carrier communication |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103001665A (en) * | 2012-10-16 | 2013-03-27 | 清华大学 | Method and device for adjusting network load matching balance in power line communication system |
| CN104702313A (en) * | 2015-03-04 | 2015-06-10 | 宁波三星电气股份有限公司 | Power control device for PLC transmitting signals |
| WO2019165819A1 (en) * | 2018-03-02 | 2019-09-06 | 珠海格力电器股份有限公司 | Power regulation method and device, power regulation method based on power line carrier |
| CN111600563A (en) * | 2019-08-28 | 2020-08-28 | 青岛鼎信通讯股份有限公司 | Gain control device for two-stage programmable amplifier for power line communication |
| CN113938160A (en) * | 2021-09-30 | 2022-01-14 | 海南电网有限责任公司 | Remote communication and online verification scheme research of small water and electricity terminal without signal |
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| US4451801A (en) * | 1981-08-24 | 1984-05-29 | National Semiconductor Corporation | Wideband linear carrier current amplifier |
| CN1703844A (en) * | 2002-01-24 | 2005-11-30 | 松下电器产业株式会社 | Device for power line carrier communications |
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| CN101969296A (en) * | 2010-10-26 | 2011-02-09 | 钜泉光电科技(上海)股份有限公司 | Power line carrier communication-based impedance adaptive power amplifier circuit and realization method thereof |
| CN201887764U (en) * | 2010-12-28 | 2011-06-29 | 长沙威胜信息技术有限公司 | Narrow-band low-voltage power line carrier communication module based on 270 kHz FSK |
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| US4451801A (en) * | 1981-08-24 | 1984-05-29 | National Semiconductor Corporation | Wideband linear carrier current amplifier |
| CN1703844A (en) * | 2002-01-24 | 2005-11-30 | 松下电器产业株式会社 | Device for power line carrier communications |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103001665A (en) * | 2012-10-16 | 2013-03-27 | 清华大学 | Method and device for adjusting network load matching balance in power line communication system |
| CN103001665B (en) * | 2012-10-16 | 2014-12-31 | 清华大学 | Method and device for adjusting network load matching balance in power line communication system |
| CN104702313A (en) * | 2015-03-04 | 2015-06-10 | 宁波三星电气股份有限公司 | Power control device for PLC transmitting signals |
| WO2019165819A1 (en) * | 2018-03-02 | 2019-09-06 | 珠海格力电器股份有限公司 | Power regulation method and device, power regulation method based on power line carrier |
| US11425665B2 (en) | 2018-03-02 | 2022-08-23 | Gree Electric Appliances, Inc. Of Zhuhai | Power adjustment method and device, power adjustment method based on power line communication |
| CN111600563A (en) * | 2019-08-28 | 2020-08-28 | 青岛鼎信通讯股份有限公司 | Gain control device for two-stage programmable amplifier for power line communication |
| CN113938160A (en) * | 2021-09-30 | 2022-01-14 | 海南电网有限责任公司 | Remote communication and online verification scheme research of small water and electricity terminal without signal |
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Application publication date: 20120711 |