CN103236874A - Power transmission device of OFDM (orthogonal frequency division multiplexing) power line carrier communication - Google Patents
Power transmission device of OFDM (orthogonal frequency division multiplexing) power line carrier communication Download PDFInfo
- Publication number
- CN103236874A CN103236874A CN2013101768875A CN201310176887A CN103236874A CN 103236874 A CN103236874 A CN 103236874A CN 2013101768875 A CN2013101768875 A CN 2013101768875A CN 201310176887 A CN201310176887 A CN 201310176887A CN 103236874 A CN103236874 A CN 103236874A
- Authority
- CN
- China
- Prior art keywords
- unit
- power
- signal
- supply voltage
- gain control
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
The invention discloses a power transmission device of OFDM (orthogonal frequency division multiplexing) power line carrier communication. The device comprises an adjustable gain amplification unit, a differential output power driving unit, a coupling unit, a power source voltage detection unit and a gain control unit, wherein the power source voltage detection unit is used for sampling a power source voltage value, and inputting a sampling result into the gain control unit; and calculating a reasonable gain control signal by the gain control unit according to the power source voltage valve, and feeding the reasonable gain control signal back to the adjustable gain amplification unit. With the adoption of the power transmission device of the OFDM power line carrier communication, the problem that output power is not insufficient due to the fact that OFDM signal peak-to-average ratio is larger is overcome, and meanwhile, communication interrupt caused by power source voltage reduction when a power line load is heavier is prevented. Compared with the traditional signal detection technology, through detecting the power source voltage, the problem that the power transmission device is not easily constricted as the peak-to-average ratio of the OFDM signal is larger is avoided.
Description
Technical field
The present invention relates to power line communication technology, particularly a kind of power transmitting apparatus of OFDM power line carrier communication.
Background technology
Power line communication is to utilize existing power line transmission data, especially utilize the low-voltage power line power distribution network to carry out carrier communication, with low cost, but compare with other communication modes, power line has a lot of characteristics as communication media: time variation is strong, the equiva lent impedance transformation range is big, and fading channel is big, and interference and noise are strong etc.In power line carrier communication, disturb in order to obtain higher speed and anti-arrowband, adopt orthogonal frequency division multiplexi (OFDM).OFDM is divided into several parallel data streams to information, data is modulated on the mutually orthogonal single sub-carrier transmits then.OFDM has reduced intersymbol interference, has improved the availability of frequency spectrum, effectively resists the arrowband and disturbs.But ofdm modulation signal has bigger peak-to-average force ratio, useful signal power is lower in the transmission signal, in order to promote the communication distance of OFDM technology, better bring into play the performance that its speed and anti-arrowband disturb, the required power transmitting element can send very big peak signal, but at home in the current standard of carrier communication, explicitly calls for for the power supply voltage of carrier communication module, this has just limited the scope of supply voltage, therefore can't improve transmitted power by improving supply voltage.Even solved the problem of transmitted power, because the equivalent load excursion of power line is very big, in some cases, even it is little of 1 ohm, so require power supply to have extremely strong power providing capability, but at home in the current standard of carrier communication, have for the transmitted power of the power supply of carrier communication module and to explicitly call for, this just makes that power exceeds standard easily under heavy duty, the passive reduction of supply voltage, need reduce transmitted power and reduce requirement to power supply this moment, therefore needs a kind of adaptive power transmitting apparatus, adapts to different situations and load.The conventional way that is used for automatic adjusting gain amplifier is to detect output signal, but because ofdm signal has bigger peak-to-average force ratio, and testing result is easy to generate fluctuation, thereby make that control loop is not easy to restrain.
Summary of the invention
The present invention seeks to solve the problem that exists in the present OFDM modulation technique power line carrier communication power transmission, a kind of power transmitting apparatus of OFDM power line carrier communication is provided.
Technical scheme of the present invention is as follows:
The invention discloses a kind of power transmitting apparatus of OFDM power line carrier communication.This device comprises: adjustable gain amplifying unit, the power drive unit of difference output, coupling unit, supply voltage detecting unit and gain control unit.The supply voltage detecting unit is used for the sampling supply voltage value, with the control unit of input gain as a result that samples, gain control unit calculates rational gain control signal according to supply voltage value, thereby feed back to the adjustable gain amplifying unit, by the adjustable gain amplifying unit signal is rationally adjusted, the power drive unit by difference output sends on the power line by coupling unit at last again.
Described coupling unit comprises coupling coil, and described coupling coil is elementary to be connected across between a pair of power line cables, secondary link for the power drive unit that connects difference output;
Described supply voltage detecting unit for detection of the magnitude of voltage of power supply, and is digital signal with voltage transitions;
Described gain control unit calculates required signal gain according to supply voltage value;
Described adjustable gain amplifying unit, the size according to given yield value adjustment signal increases signal when yield value increases, reduce signal when yield value reduces;
The power drive unit of described difference output provides difference output, and the signal maximum peak peak value of every road output is near supply voltage;
Beneficial effect of the present invention
From technique scheme as can be seen, the present invention has following beneficial effect:
1. the power drive unit of difference provided by the invention output can provide the maximum output swing near 2 times of supply voltages, the signal amplitude of maximization OFDM, overcome since OFDM exist peak-to-average force ratio greatly cause can't effective output problem.
2. provided by the inventionly control output gain signal by detecting supply voltage value, and then reach the technical scheme of control output signal power purpose, prevent under the heavy duty situation, because output signal power is excessive, cause supply voltage to be pulled to very low position, thereby cause transmitted power to exceed standard, even influence the situation of the operate as normal of other circuit.
3. provided by the inventionly control the technical scheme of output gain signal by detecting supply voltage value, avoided ofdm signal to adopt detected signal value to come ride gain, the problem that the control that causes gaining is not easy to restrain.
Description of drawings
The present invention will be further described below in conjunction with accompanying drawing and embodiment.
Fig. 1 is system block diagram of the invention process
Fig. 2 is the embodiment of supply voltage detecting unit
Fig. 3 is the embodiment of the power drive unit of difference output
Specific implementation method
Circuit block diagram of the invention process as shown in Figure 1.The power line power transmitting apparatus of described a kind of suitable OFDM modulation technique comprises: adjustable gain amplifying unit 101, the power drive unit 102 of difference output, coupling unit 103, supply voltage detecting unit 104, and gain control unit 105.The output of adjustable gain amplifying unit 101 is connected with the input of the power drive unit 102 of difference output, the output of the power drive unit 102 of difference output is connected with the secondary of coupling unit 103, the input of supply voltage detecting unit 104 connects power power-supply, the output of supply voltage detecting unit 104 is connected with gain control unit 105, and the output of gain control unit 105 is connected with adjustable gain amplifying unit 101.
Described coupling unit 103 comprises coupling coil, elementary (this a pair of power line cables indicates with zero line and live wire respectively) between a pair of power line cables, the secondary difference output end for the power drive unit 102 that connects difference output of being connected across of described coupling coil;
Below the power line power transmitting apparatus of a kind of suitable OFDM modulation technique of the present invention is elaborated.
The power supply detecting unit can adopt structure as shown in Figure 2, and circuit adopts two comparators, and reference level is respectively 9 volts and 10 volts, supply voltage respectively with 9 volts and 10 volts of comparisons, greater than the time export 1, less than the time export 0.
Gain control unit arranges initial gain for maximum, and the power supply detecting unit detects supply voltage value, and when exporting 11, namely supply voltage keeps gain constant greater than 10 volts; When output 10 time, namely supply voltage greater than 9 volts less than 10 volts, gain remains unchanged; When exporting 00, be that supply voltage is less than 9 volts, linear the successively decreasing of gain control unit output gain this moment, the adjustable gain amplifying unit reduces signal, the power drive unit power output of difference output descends, and supply voltage rises, when supply voltage value greater than 9 volts during less than 10 volts, gain stops to reduce, and keeps current gain value.
The power drive unit of difference output can adopt structure as shown in Figure 3, adopt power amplifier to connect into the resistive degeneration structure, realize that the spiking output peak-to-peak value is near supply voltage, adopt two same circuit to connect the input signal of anode and negative terminal respectively, thereby produce the output signal of positive and negative two-way difference.
Become when the impedance of power line is, and excursion is very big, generally is changed to 1 ohm to hundreds of ohm.
Lighter in the power line load, under 50 ohm situation, supply voltage can passively not drag down, remain on 12 volts, voltage detection unit was exported 11 o'clock, gain control unit provides maximum gain control signal, adjustable gain amplifying unit output spiking output, and the power drive unit of difference output is exported the peak-to-peak value signal near 24 volts;
The power line load is very heavy, as: under 1 ohm situation, supply voltage is pulled low to rapidly below 9 volts, when voltage detection unit exports 00, the linear reduction gain of gain control unit, the adjustable gain amplifying unit reduces amplitude output signal, and the power drive unit power output of difference output reduces, and supply voltage raises; When supply voltage is elevated to greater than 9 volts during less than 10 volts, detecting unit was exported 10 o'clock, and gain control unit keeps current gain, has guaranteed power output maximization, has avoided simultaneously because power supply is crossed the low problem that influences other circuit working.
The present invention is not limited to above-mentioned embodiment, and those skilled in the art can also find out many selections, combination, modifications and changes on the basis of above explanation.Therefore, the scope of the present invention should be listed as claims.
Claims (9)
1. the power transmitting apparatus of an OFDM power line carrier communication.
2. this device comprises: adjustable gain amplifying unit, the power drive unit of difference output, coupling unit, supply voltage detecting unit and gain control unit.
3. the supply voltage detecting unit is used for the sampling supply voltage value, with the control unit of input gain as a result that samples, gain control unit calculates rational gain control signal according to supply voltage value and feeds back to the adjustable gain amplifying unit, by the adjustable gain amplifying unit signal is adjusted, the power drive unit by difference output sends on the power line by coupling unit again.
4. coupling unit according to claim 1 is characterized in that described coupling unit comprises coupling coil, and coupling coil is elementary to be connected across between a pair of power line cables, secondary link for the power drive unit that connects difference output.
5. supply voltage detecting unit according to claim 1 is characterized in that, described supply voltage detecting unit is for detection of the magnitude of voltage of power supply source, and magnitude of voltage is converted to digital signal.
6. gain control unit as claimed in claim 1 is characterized in that, described gain control unit calculates required signal gain according to supply voltage value.
7. adjustable gain amplifying unit as claimed in claim 1 is characterized in that, described adjustable gain amplifying unit increases signal according to the size of given yield value adjustment signal when yield value increases, reduce signal when yield value reduces.
8. the power drive unit of difference output as claimed in claim 1 is characterized in that, the power drive unit of described difference output provides the signal of difference output.
9. the power drive unit of difference output as claimed in claim 5 is characterized in that, the signal maximum peak peak value of the power drive unit of described difference output every road output is near supply voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101768875A CN103236874A (en) | 2013-05-14 | 2013-05-14 | Power transmission device of OFDM (orthogonal frequency division multiplexing) power line carrier communication |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101768875A CN103236874A (en) | 2013-05-14 | 2013-05-14 | Power transmission device of OFDM (orthogonal frequency division multiplexing) power line carrier communication |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103236874A true CN103236874A (en) | 2013-08-07 |
Family
ID=48884895
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013101768875A Pending CN103236874A (en) | 2013-05-14 | 2013-05-14 | Power transmission device of OFDM (orthogonal frequency division multiplexing) power line carrier communication |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103236874A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015176381A1 (en) * | 2014-05-21 | 2015-11-26 | 瑞斯康微电子（深圳）有限公司 | Power line carrier power amplification circuit |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001041383A2 (en) * | 1999-11-30 | 2001-06-07 | Itran Communications Ltd. | Code shift keying transmitter for use in a spread spectrum communications system |
| WO2007064024A1 (en) * | 2005-11-29 | 2007-06-07 | Matsushita Electric Industrial Co., Ltd. | Signal output circuit, communication apparatus and signal output control method |
| CN101217294A (en) * | 2008-01-04 | 2008-07-09 | 珠海天瑞电力科技有限公司 | An electric network bridge |
| 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 |
| CN102723922A (en) * | 2012-06-15 | 2012-10-10 | 钜泉光电科技(上海)股份有限公司 | Automatic amplitude control loop and control method thereof |
-
2013
- 2013-05-14 CN CN2013101768875A patent/CN103236874A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001041383A2 (en) * | 1999-11-30 | 2001-06-07 | Itran Communications Ltd. | Code shift keying transmitter for use in a spread spectrum communications system |
| WO2007064024A1 (en) * | 2005-11-29 | 2007-06-07 | Matsushita Electric Industrial Co., Ltd. | Signal output circuit, communication apparatus and signal output control method |
| CN101217294A (en) * | 2008-01-04 | 2008-07-09 | 珠海天瑞电力科技有限公司 | An electric network bridge |
| 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 |
| CN102723922A (en) * | 2012-06-15 | 2012-10-10 | 钜泉光电科技(上海)股份有限公司 | Automatic amplitude control loop and control method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015176381A1 (en) * | 2014-05-21 | 2015-11-26 | 瑞斯康微电子（深圳）有限公司 | Power line carrier power amplification circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104426558B (en) | Radio frequency transmitter and electronic device | |
| CN100592237C (en) | Intelligent switch power source power detection and control device | |
| CN103607218A (en) | Cross-frequency-band power-line carrier communication system and communication method thereof | |
| CN106033953B (en) | Envelope-tracking amplifier and amplifying circuit with the envelope-tracking amplifier | |
| CN110190817A (en) | A kind of magnetic resonance of PIN-based diode radio frequency amplifier linearity adjustment method | |
| CN103219753A (en) | Method and intelligent terminal of power supply and communication to external equipment through audio interface | |
| CN201550320U (en) | Multipath constant current control circuit suitable for LED drivers | |
| CN104753185A (en) | Voltage stability control system and method for wireless power transmission | |
| CN103236874A (en) | Power transmission device of OFDM (orthogonal frequency division multiplexing) power line carrier communication | |
| US20030071721A1 (en) | Adaptive radiated emission control | |
| CN202364228U (en) | AGC (Automatic Gain Control) optical receiving module circuit | |
| CN102571152A (en) | Control device of transmitted power of power line carrier communication | |
| CN104144001A (en) | Method for improving reliability of power line carrier signal transmission | |
| CN107682047B (en) | Channel-aware medium-voltage power line communication data transmission method | |
| Chen et al. | Application of SWPDT in the Feedback Control of Wireless EV Charging | |
| CN110247674A (en) | Integrated Service Digital Network radio-frequency front-end control method and system based on supply voltage coded modulation | |
| CN206117659U (en) | Broadband OFDM power line carrier communication's frequency spectrum compensating circuit device | |
| US11309738B2 (en) | Recovery of modulation amplitude in wireless charger tx demodulation | |
| CN106787711A (en) | The mu balanced circuit and Switching Power Supply of a kind of Switching Power Supply | |
| CN206422774U (en) | A kind of carrier communication electric current loop signal coupling apparatus | |
| CN109586423B (en) | Series resonance wireless energy transmission system and method based on-off keying modulation | |
| CN111983306A (en) | Wireless energy transmission frequency tracking detection circuit and implementation method | |
| CN206439045U (en) | A kind of submerged electric oil pump well data transmission system | |
| CN106341185A (en) | Led visible light communication system and control method thereof | |
| CN112383951B (en) | Base station transmitting equipment and power supply management method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20130807 |