CN201435729Y - Modem for low-voltage power line carrier communication - Google Patents

Modem for low-voltage power line carrier communication Download PDF

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Publication number
CN201435729Y
CN201435729Y CN 200920041007 CN200920041007U CN201435729Y CN 201435729 Y CN201435729 Y CN 201435729Y CN 200920041007 CN200920041007 CN 200920041007 CN 200920041007 U CN200920041007 U CN 200920041007U CN 201435729 Y CN201435729 Y CN 201435729Y
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frequency
carrier signal
signal
mentioned
controller
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CN 200920041007
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高恭娴
孙刚
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Nanjing Vocational College Of Information Technology
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Nanjing Vocational College Of Information Technology
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Abstract

The utility model provides a modem for low pressure power line carrier communication, including controller, frequency synthesizer, power amplifier, coupler, low pass filter, conditioning amplifier and frequency discriminator. The frequency synthesizer receives the output signal of the controller, outputs a first carrier signal with the frequency capable of being changed according to the set frequency interval, and is coupled to the low-voltage power line through power amplification. The frequency discriminator receives a first carrier signal and a second carrier signal which passes through the low-pass filter and the conditioning amplifier, when the frequency of the second carrier signal is equal to that of the first carrier signal, the frequency discriminator outputs a locking signal, and the controller processes data information of the locking signal. The controller automatically changes the frequency of the first carrier signal to continue searching if the lock signal is not received within a certain time interval. The utility model discloses change the frequency of the carrier signal who sends/receive according to setting for the interval, realize frequency hopping data transmission, reduced the same frequency interference on the low pressure power line and data communication's error rate.

Description

The modulator-demodulator that is used for low-voltage powerline carrier communication
Technical field
The utility model relates to a kind of modulator-demodulator, and particularly relevant for a kind of modulator-demodulator that is used for low-voltage powerline carrier communication.
Background technology
Automatic meter reading system is to be the master-slave mode multistage network system of core with the main website that is located in the electric company, it is by low-voltage power carrier technology and the data acquisition unit (acquisition module) or the acquisition terminal that are connected to electric supply meter, utilizes the existing power line to realize the automatic data logging work of extensive region as Channel server; Simultaneity factor has stronger compatibility and expandability.Automatic meter reading system has thoroughly changed traditional manual metering mode that wastes time and energy.Administrative department is home-confined, just can accurately know the operating position of users' at different levels water, electricity, gas etc. by Automatic meter reading system.Can realize automatic data logging, charging, statistical report form, and the remote on/off controlled function, by with the bank data networking functions such as charge that can realize transferring accounts automatically, embodied high-tech, intelligentized scientific management pattern.By increasing the centralized automatic meter-reading facility, improved counting cost by gas meter efficiency of managing and service levels such as water, electricity, gas, reduced administrative expenses, the user also can exempt bothering of checking meter, charge, and has greatly made things convenient for user and administrative department.
Automatic meter reading system mainly is to finish watt metering or information gathering, information remote transmitting, daemon software processing and analyze three part tasks.Front and back two parts technology is ripe, and the kilowatt meter reading-out system key problem in technology is to solve information remote transmitting-communication problem.Automatic meter reading system has the several data transmission manner at present, wherein utilizing low-voltage power line to carry out transfer of data is that most convenient also is the minimum a kind of method of cost, but power line is the power frequency electric energy for transmission 50Hz, rather than lay for communication, so the often difficult requirement of directly satisfying carrier communication of its characteristic.This is embodied directly in two aspects: the 1. impedance operator of electric power networks and decay thereof restricted the transmission range of signal.2. the noise jamming on the power line has restricted signal transfer quality.
The present most popular low voltage power line carrier modulator-demodulator of checking meter all is the principle of the spread spectrum communication of using, as carrier chip PL3105, PL3105 is a kind of serial shift communication chip of frame synchronization mode, adopt the carrier communication mode of direct sequence spread spectrum, its speed is that 500bps/250bps is optional, is defaulted as 500bps, and the centre frequency of carrier wave is 120KHz.If but, just could not correctly accept/send order and data in that very strong noise jamming co-channel interference just on identical frequency is arranged on the low-voltage power line, would still have part order and loss of data.
The utility model content
The utility model proposes a kind of modulator-demodulator that is used for low-voltage powerline carrier communication, can be according to the signal to noise ratio on the low-voltage power line, automatically change the frequency of the carrier signal of transmission/reception, realized the frequency hopping transfer of data, greatly reduce the error rate of the influence and the data communication of the co-channel interference on the low-voltage power line, improved the reliability of signal transmission.
The utility model proposes a kind of modulator-demodulator that is used for low-voltage powerline carrier communication, comprise controller, frequency synthesizer, power amplifier, coupler, low pass filter, conditioning amplifier and frequency discriminator.
Controller electrically connects list/three phase watt-hour meter or concentrator.Frequency synthesizer receives the output signal of controller, and output first carrier signal, and the frequency of first carrier signal can change by the frequency interval of setting.Power amplifier electrically connects frequency synthesizer and controller, sends the first carrier signal.Coupler electrically connects power amplifier, and the first carrier signal after power amplifier amplifies is coupled on the low-voltage power line by coupler.Low pass filter electrically connects coupler, second carrier signal of low-voltage power line input is coupled to low pass filter by coupler input.The conditioning amplifier electrically connects low pass filter, and the output of low pass filter is amplified.Frequency discriminator electrically connects controller, frequency synthesizer and conditioning amplifier, receive the first carrier signal, and receive through low pass filter filtering and and second carrier signal of conditioning amplifier after amplifying, when the frequency of second carrier signal equated with the frequency of first carrier signal, frequency discriminator locked second carrier signal and by controller the entrained information of second carrier signal is handled.If the frequency that the unequal then controller of the frequency of the frequency of second carrier signal and first carrier signal changes the first carrier signal automatically in certain time interval continues search.Modulator-demodulator is operated in the half-duplex state.
The utlity model has good antijamming capability, even there is the part frequency disturbed, still can on other not disturbed frequencies, communicate by letter normally, make the interference on the low-voltage power line drop to corresponding minimum point, improve the reliability of low-voltage powerline carrier communication signal transmission.
Description of drawings
Figure 1 shows that the schematic diagram of the utility model embodiment.
Figure 2 shows that the schematic diagram of Fig. 1 medium frequency synthesizer.
Figure 3 shows that the schematic diagram of frequency discriminator among Fig. 2.
Embodiment
For above-mentioned and other purpose, feature and advantage of the present utility model can be become apparent, preferred embodiment cited below particularly, and conjunction with figs. are described in detail below.
Figure 1 shows that the schematic diagram of the utility model embodiment.As shown in Figure 1, the utility model comprises controller 11, frequency synthesizer 12, power amplifier 13, coupler 3, low pass filter 24, conditioning amplifier 23 and frequency discriminator 22.
Controller 11 electrically connects list/three phase watt-hour meter or concentrator.In the present embodiment, if the utility model is connected on list/three phase watt-hour meter interface end, its controller 11 responsible communications with list/three phase watt-hour meter are carried out exchanges data; Send data message by modulator-demodulator again or accept the command information of concentrator.If the utility model is connected on the concentrator interface end, its controller 11 is accepted modulator-demodulator and is received the ammeter data that comes and send to the main website that checks meter, and also sends the basic parameter of check meter order and each ammeter simultaneously as requested.
Frequency synthesizer 12 receives the output signal of controller 11, and output has data and command information first carrier signal to low-voltage power line 4, these first carrier signals can be according to the signal to noise ratio of corresponding frequencies on the low-voltage power line 4, automatically by setting the frequency that changes carrier signal at interval.
Power amplifier 13 electrically connects frequency synthesizer 12 and controller 22, receives the first carrier signal.Coupler 3 electrically connects power amplifier 13, and the first carrier signal after power amplifier 13 amplifies is coupled on the low-voltage power line 4 by coupler 3.
Low pass filter 24 electrically connects coupler 3, second carrier signal of low-voltage power line 4 inputs is coupled to low pass filter 24 by coupler 3 input.
Conditioning amplifier 23 electrically connects low pass filter 24, and the output of low pass filter 24 is amplified.
Frequency discriminator 22 electrically connects controller 11, frequency synthesizer 12 and conditioning amplifier 23, receive the first carrier signal, and receive through second carrier signal after low pass filter 24 filtering and 23 amplifications of conditioning amplifier, when the frequency of second carrier signal equated with the frequency of first carrier signal, frequency discriminator locked second carrier signal and by controller the entrained information of second carrier signal is handled.If the frequency that the unequal then controller of the frequency of the frequency of second carrier signal and first carrier signal changes the first carrier signal automatically in certain time interval continues search.
Figure 2 shows that the schematic diagram of Fig. 1 medium frequency synthesizer.As shown in Figure 2, the frequency synthesizer in the present embodiment 12 comprises voltage controlled oscillator 121, variable frequency divider 122, frequency generator 123, first phase discriminator 124, first loop filter 125.Voltage controlled oscillator 121 electrically connects power amplifier 13, and variable frequency divider 122 electrically connects controller 122, and the divider ratio that receives controller 11 controls makes the output frequency division of this voltage controlled oscillator 121, obtains a feedback signal; Frequency generator 123 has crystal oscillator, produces the frequency interval signal; First phase discriminator 124 electrically connects frequency generator 123 and variable frequency divider 122, detect first phase signal (being a pulsating direct current signal) of frequency interval signal and feedback signal, first loop filter 125 electrically connects first phase discriminator and voltage controlled oscillator 121, receiving phase difference signal (pulsating direct current signal), filtering is radio-frequency component wherein, and the output of control voltage controlled oscillator 121.
Figure 3 shows that the schematic diagram of frequency discriminator among Fig. 2.Frequency discriminator 22 compares the frequency of the first carrier signal and second carrier signal, if equate frequency discriminator output locking signal SD.
In the present embodiment, controller 11 is single-chip microcomputers, and its internal circuit figure has in this area and belongs to common practise the people of common knowledge, does not repeat them here.And the voltage controlled oscillator in the frequency synthesizer 121, variable frequency divider 122, frequency generator 123, first phase discriminator 124, first loop filter 125 and frequency discriminator 22, also having the internal circuit diagram of power amplifier 13, amplifier 23 and low pass filter 24 also is that the personnel that have common knowledge in this area can realize easily, does not repeat them here.
The concrete operation principle of the utility model is as follows:
1. the utility model is connected on concentrator side:
The utility model is connected on the initial modulation operating state that is operated in of concentrator side.
Frequency generator 123 produces the frequency interval of the setting of low-voltage power lines 4 carrier frequencies, and as the input signal Ui (t) of first phase discriminator 124, in the present embodiment, the low voltage power line carrier frequency is between 50KHz and 150KHz, and frequency interval can be 1KHz.
First phase discriminator 124 is phase comparison devices, is used for detecting the phase difference between feedback signal Uf (t) and the input signal Ui (t), and it is converted to error voltage Ud (t).Error voltage Ud (t) is the function of the phase difference θ e (t) of input signal Ui (t) and feedback signal Uf (t).
First loop filter 125 has low-pass characteristic, and it can play the effect of low pass filter.
Voltage controlled oscillator 121 is a kind of voltage-frequency converting means, and conduct is by controlled oscillator in loop, and its frequency of oscillation should change linearly with input control voltage Uc (t).
Variable frequency divider 122 is that the frequency of output signal U o (t) is carried out frequency division, and divider ratio is variable by controller 11 controls.Controller 11 control output frequency Uo (t) are the multiples of the divider ratio of the frequency Ui (t) that sends of frequency generator 123.For example, when the frequency of Ui (t) is 1KHZ, the divider ratio of variable frequency divider 122 is 100, and when Uo (t) was 100KHZ, Uf (t) and Ui (t) equated that voltage controlled oscillator 121 is promptly exported 100KHZ; Then the divider ratio of controller control variable frequency divider 122 is 101, and Uo this moment (t) is 101KHZ, and Uf (t) and Ui (t) just can equate, can realize the interval saltus step of the carrier frequency of output signal with 1KHZ like this.
Then, output signal U o (t) sends into power amplifier, and it is the low-voltage power line 4 of 1～100 Ω that this power amplifier 13 comes driving impedance by coupler 3.In addition, power amplifier 13 also carries out frequency range filtering, suppresses to send the second harmonic of signal.
If in certain time interval, can't accept correct data-signal, explanation might be on this frequency low-voltage power line interference signal stronger, controller 11 changes the divider ratio of variable frequency divider 122, the outgoing carrier frequency of voltage controlled oscillator also changes thereupon, wait for again and accept data, and the like in seeking all over from 50K to 150K all frequencies are carrier frequencies of the integral multiple of 1K.
2. the utility model is connected on list (three) and shows end mutually:
The utility model is connected on list (three) and shows the initial demodulation state that is operated in of end mutually, coupler 3 is obtained signal from low-voltage power line 4, by low pass filter 24 filtering high-frequency harmonics, in amplifier 23, amplify the input that is met second phase discriminator 22 and will try to achieve input signal and be input to second phase discriminator, 22 inputs.
When the frequency of second carrier signal equated with the frequency of first carrier signal, frequency discriminator was exported locking signal SD and by controller the entrained information of second carrier signal is handled.If the frequency that the unequal then controller of the frequency of the frequency of second carrier signal and first carrier signal changes the first carrier signal automatically in certain time interval continues search.
The operation principle of frequency synthesizer 12 is introduced in foregoing, no longer repeats to introduce at this.
For instance, when the frequency of Ui (t) is 1KHZ, the divider ratio of variable frequency divider 122 is 100 o'clock, and the frequency of Uo (t) is 100KHZ, is that the Ui ' of 100KHZ (t) locks to frequency then, and utilizes controller that it is carried out data and accept and analyze.If the Ui ' that does not search frequency and be 100KHZ (t), the divider ratio that controller 11 is adjusted variable frequency divider 122 is 101, the frequency of Uo this moment (t) is 101KHZ, be that the Ui ' of 101KHZ (t) locks then to frequency, if still do not have qualified Ui ' (t), then controller 11 continues to adjust the divider ratio of variable frequency divider 122, has then realized input signal Ui ' frequency hopping (t).
In sum, the utility model has adopted the frequency hopping communications technology, can be according to the signal to noise ratio of certain characteristic frequency on the low-voltage power line, the frequency of the carrier signal of change transmission/reception is to seek suitable communication frequency, even there is the part frequency disturbed, still can on other not disturbed frequencies, communicate by letter normally, greatly reduce the error rate of transfer of data, improve the reliability of low-voltage powerline carrier communication signal transmission.
Concrete case study on implementation only is a preferable case study on implementation of the present utility model described in the utility model, is not to be used for limiting practical range of the present utility model.Be that all equivalences of doing according to the content of the utility model claim change and modification, all should be as technology category of the present utility model.

Claims (3)

1. be used for the modulator-demodulator of low-voltage powerline carrier communication, it is characterized in that, comprising:
Controller electrically connects list/three phase watt-hour meter or concentrator;
Frequency synthesizer receives the output signal of controller, and exports the first carrier signal, and these first carrier signals change frequency by the frequency interval of setting;
Power amplifier electrically connects said frequencies synthesizer and controller, receives above-mentioned these first carrier signals;
Coupler electrically connects above-mentioned power amplifier and power line, and the first carrier signal after power amplifier amplifies is coupled to low-voltage power line by coupler;
Low pass filter electrically connects coupler, and second carrier signal of low-voltage power line input is connected to the input of low pass filter through coupler;
The conditioning amplifier electrically connects low pass filter, and the output of low pass filter is amplified; And
Frequency discriminator, electrically connect above-mentioned controller, frequency synthesizer and conditioning amplifier, receive above-mentioned first carrier signal, and receive through second carrier signal after low pass filter filtering and the amplification of conditioning amplifier, when the frequency of above-mentioned second carrier signal equates with the frequency of above-mentioned first carrier signal, above-mentioned frequency discriminator output locking signal, and by above-mentioned controller the entrained data message of above-mentioned second carrier signal is handled, if the frequency of the frequency of second carrier signal and first carrier signal is unequal then controller changes the frequency of first carrier signal automatically continues search in certain time interval.
2. modulator-demodulator according to claim 1 is characterized in that wherein frequency synthesizer comprises:
Voltage controlled oscillator electrically connects above-mentioned power amplifier;
Variable frequency divider electrically connects above-mentioned controller, and the divider ratio that receives controller control makes the output frequency of this voltage controlled oscillator controlled, obtains a feedback signal;
Frequency generator has crystal oscillator, produces the frequency interval signal of above-mentioned setting;
First phase discriminator electrically connects said frequencies generator and above-mentioned frequency divider, detects first phase signal through the frequency interval signal of the output frequency signal of the voltage controlled oscillator of variable frequency divider frequency division and setting; And
First loop filter electrically connects above-mentioned phase discriminator and above-mentioned voltage controlled oscillator, receives above-mentioned phase signal, makes this phase signal level and smooth, and controls the output of described voltage controlled oscillator.
3. modulator-demodulator according to claim 1 and 2 is characterized in that wherein frequency discriminator comprises:
Second phase discriminator, above-mentioned second phase discriminator electrically connects the said frequencies synthesizer, more above-mentioned first carrier signal and above-mentioned second carrier signal, if above-mentioned first carrier signal and above-mentioned second frequency of carrier signal equate promptly to export locking signal to controller, if second carrier signal is unequal then controller changes the frequency of first carrier signal automatically continues to search for the frequency of first carrier signal in certain time interval.
CN 200920041007 2009-04-08 2009-04-08 Modem for low-voltage power line carrier communication Expired - Fee Related CN201435729Y (en)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102468870A (en) * 2010-11-18 2012-05-23 深圳长城开发科技股份有限公司 Carrier wave modulating method and circuit
CN102739339A (en) * 2011-04-01 2012-10-17 杭州讯能科技有限公司 Power line carrier communication method and system thereof
CN103166675A (en) * 2013-03-03 2013-06-19 北京福星晓程电子科技股份有限公司 Power line signal detecting and obtaining method and system based on spread spectrum
CN103607224A (en) * 2013-12-02 2014-02-26 国家电网公司 Method for building two-way link of power-line carrier communication system
CN108923400A (en) * 2018-07-03 2018-11-30 国网山东省电力公司惠民县供电公司 A kind of overload protection method and system of power line carrier
CN109244958A (en) * 2018-10-22 2019-01-18 南京信息职业技术学院 Cable laying device and using method thereof
CN112688718A (en) * 2020-12-28 2021-04-20 深圳市泰和安科技有限公司 Low-voltage direct-current carrier slave communication system based on frequency modulation
CN112688719A (en) * 2020-12-28 2021-04-20 深圳市泰和安科技有限公司 Low-voltage direct-current carrier host communication system based on frequency modulation
CN112787687A (en) * 2020-12-28 2021-05-11 深圳市泰和安科技有限公司 Low-voltage direct-current carrier master-slave machine communication system based on frequency modulation

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102468870A (en) * 2010-11-18 2012-05-23 深圳长城开发科技股份有限公司 Carrier wave modulating method and circuit
CN102739339A (en) * 2011-04-01 2012-10-17 杭州讯能科技有限公司 Power line carrier communication method and system thereof
CN102739339B (en) * 2011-04-01 2015-04-22 杭州讯能科技有限公司 Power line carrier communication method and system thereof
CN103166675B (en) * 2013-03-03 2016-02-17 北京福星晓程电子科技股份有限公司 Power line signal based on spread spectrum detects and acquisition methods and system
CN103166675A (en) * 2013-03-03 2013-06-19 北京福星晓程电子科技股份有限公司 Power line signal detecting and obtaining method and system based on spread spectrum
CN103607224A (en) * 2013-12-02 2014-02-26 国家电网公司 Method for building two-way link of power-line carrier communication system
CN103607224B (en) * 2013-12-02 2015-09-23 国家电网公司 Set up the method for power-line carrier communication system two-way link
CN108923400A (en) * 2018-07-03 2018-11-30 国网山东省电力公司惠民县供电公司 A kind of overload protection method and system of power line carrier
CN109244958A (en) * 2018-10-22 2019-01-18 南京信息职业技术学院 Cable laying device and using method thereof
CN109244958B (en) * 2018-10-22 2023-08-08 南京信息职业技术学院 Cable laying device and application method thereof
CN112688718A (en) * 2020-12-28 2021-04-20 深圳市泰和安科技有限公司 Low-voltage direct-current carrier slave communication system based on frequency modulation
CN112688719A (en) * 2020-12-28 2021-04-20 深圳市泰和安科技有限公司 Low-voltage direct-current carrier host communication system based on frequency modulation
CN112787687A (en) * 2020-12-28 2021-05-11 深圳市泰和安科技有限公司 Low-voltage direct-current carrier master-slave machine communication system based on frequency modulation
CN112688718B (en) * 2020-12-28 2022-11-15 深圳市泰和安科技有限公司 Low-voltage direct-current carrier slave communication system based on frequency modulation
CN112787687B (en) * 2020-12-28 2022-12-13 深圳市泰和安科技有限公司 Low-voltage direct-current carrier master-slave machine communication system based on frequency modulation

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