CN103095340B - Low voltage power line carrier interconnection and intercommunication device - Google Patents
Low voltage power line carrier interconnection and intercommunication device Download PDFInfo
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- CN103095340B CN103095340B CN201210535147.1A CN201210535147A CN103095340B CN 103095340 B CN103095340 B CN 103095340B CN 201210535147 A CN201210535147 A CN 201210535147A CN 103095340 B CN103095340 B CN 103095340B
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Abstract
The invention discloses a low voltage power line carrier interconnection and intercommunication device which comprises a carrier-receiving module, a modulation mode selecting module and a frequency demodulation module, wherein a carrier signal input end of the carrier-receiving module is used for connecting with a carrier signal output end of a low voltage power line, the carrier signal output end of the carrier-receiving module is connected with the carrier signal input end of the frequency demodulation module, a control signal output end of the modulation mode selecting module is connected with the control signal output end of the frequency demodulation module, the carrier-receiving module receives low voltage power line carrier signals and transmits the carrier signals to the modulation mode selecting module, the modulation mode selecting module controls the demodulation mode of the frequency demodulation module according to a carrier communication method, and the frequency demodulation module demodulates the carrier signals and transmits the obtained demodulation signals after demodulation from the carrier signal output end to a carrier communication device. The low voltage power line carrier interconnection and intercommunication device has the advantages that the interconnection and the intercommunication among communication devices are realized, the incompatibility problem of a low voltage intensive meter-reading system communications is solved, and core technologies of various communication programs are protected.
Description
Technical field
The invention belongs to low-voltage powerline carrier communication field, particularly relate to a kind of low voltage power line carrier and to interconnect device, be applicable to different voltage power-line carrier communication technology scheme, realize interconnecting of communication equipment.
Background technology
Voltage power-line carrier communication technology refers to and is applied to 380V electric pressure and following power-line carrier communication.It is mainly used in transmitting electric wire online, user checks meter and the information of home automation and data.
In recent years, the voltage power-line carrier communication technology fast development that China is domestic, carrier communication has entered the stage extensively built and be suitable for.Various types of voltage power-line carrier communication technology meets the needs of current construction low pressure carrier wave centralized meter-reading system all substantially.But, promote in the process be suitable in voltage power-line carrier communication technology and occurred following problem: due to the diversity of voltage power-line carrier communication technology scheme, the voltage power-line carrier communication technology scheme that domestic and international each carrier chip producer provides also can be different, therefore there is the phenomenon that communication plan is incompatible, this phenomenon directly results in communication equipment and can not interconnect and exchange, and so causes difficult management appears in grid company situation when large-scale application carrier communication.
So, the incompatibility problem solving low-voltage collecting meter reading system communication be the current industry promote be suitable for voltage power-line carrier communication technology time technical barrier urgently to be resolved hurrily.
Summary of the invention
The object of the present invention is to provide a kind of structure simple, solve low-voltage collecting meter reading system communication incompatibility problem, low voltage power line carrier that communication equipment interconnects can be realized to interconnect device; for grid company large-scale application carrier communication offers convenience, also protect the core technology of various low-voltage powerline carrier communication scheme simultaneously.
Above-mentioned purpose of the present invention realizes by the following technical solutions: a kind of low voltage power line carrier interconnects device, it is characterized in that comprising:
Carrier receiving module, for receiving low voltage power line carrier signal;
Modulation system selects module, for the demodulation modes according to carrier communication mode control frequency demodulation module;
Frequency demodulation module, for demodulation carrier signal and by the restituted signal that obtains after demodulation to carrier communication apparatus transmission;
The carrier signal input of described carrier receiving module is used for being connected with the carrier signal output of low-voltage power line, the carrier signal output of described carrier receiving module is connected with the carrier signal input of frequency demodulation module, and described modulation system selects the control signal output of module to be connected with the control signal input of frequency demodulation module; Described carrier receiving module receives low voltage power line carrier signal, and this carrier signal is sent to modulation system selection module, modulation system selects module according to the demodulation modes of carrier communication mode control frequency demodulation module, described frequency demodulation module demodulation carrier signal, and by the restituted signal that obtains after demodulation by restituted signal output to carrier communication apparatus transmission, and carry out carrier signal response after it is resolved.
The present invention is sent to carrier communication apparatus after low voltage power line carrier signal is carried out demodulation; achieve communication equipment interconnect and exchange; solve low-voltage collecting meter reading system communication incompatibility problem; for grid company large-scale application carrier communication offers convenience, also protect the core technology of various low-voltage powerline carrier communication scheme simultaneously.
As one embodiment of the present invention, described carrier receiving module adopts two-stage pi type filter cascade system, and in communication band, the amplitude-frequency characteristic of each frequency carrier signal is consistent with phase-frequency characteristic, can adapt to different carrier communication modulation algorithm.Selected by different low-voltage powerline carrier communication scheme, carrier communication frequency is different, because the amplitude-frequency characteristic of carrier receiving module of the present invention is consistent with phase-frequency characteristic, so receptivity is consistent, and can not affect the modulation system to carrier signal phase information sensing.
As a kind of optimal way of the present invention, described pi type filter cascade is made up of two capacitors and an inductor, one end of described capacitor connects one end of another capacitor by inductor, the other end of two capacitors is connected with the carrier signal input of carrier receiving module, and the two ends of described inductor are connected with the carrier signal output of carrier receiving module.In selected passband, input impedance and output impedance are all Low ESR, and adapt to effective transmission that low-voltage power line Low ESR environment realizes carrier signal, the passband of filtering is simultaneously disturbed outward, ensures effective reception of carrier signal.
The present invention can by following execution mode:
Described frequency demodulation module adopts digital form demodulation carrier signal, and obtain the symbol signal corresponding to different modulating algorithm, described symbol signal is described restituted signal.
Described carrier communication mode adopts FSK modulation, and described frequency demodulation module obtains described symbol signal with the statistical signal cycle in conjunction with the side of digital filtering.FSK is the abbreviation of Frequency-shift keying, and implication is frequency shift keying, and it utilizes the frequency change of carrier wave to carry out transmitting digital information.
Described carrier communication mode adopts PSK modulation, and the mode that described frequency demodulation module changes in conjunction with digital filtering with statistical signal phase place obtains described symbol signal.PSK implication is phase shift keying, and it is a kind of modulation technique representing input signal information by carrier phase.
Described carrier communication mode adopts OFDM modulation, and described frequency demodulation module obtains described symbol signal with FFT in conjunction with the mode of digital filtering.OFDM is orthogonal frequency division multiplexi, the one of multi-carrier modulation; FFT(Fast Fourier Transformation), being fast Fourier transform, is the fast algorithm of discrete fourier transform.
Described digital filtering refers to the signal intensity when there is not meeting selected carrier communication mode, substitutes with the signal intensity meeting selected carrier communication mode.Can effectively other frequency noises of filtering to the interference of selected carrier communication mode.
Compared with prior art, the present invention has following significant effect:
(1) the present invention is sent to carrier communication apparatus after low voltage power line carrier signal is carried out demodulation, achieve communication equipment interconnect and exchange, solve low-voltage collecting meter reading system communication incompatibility problem, for grid company large-scale application carrier communication offers convenience; Also protect the core technology of various low-voltage powerline carrier communication scheme simultaneously.
(2) demodulation mode of the present invention and filtering mode all use pure digi-tal mode, and not needing increases different analogue devices for different modulating mode, have saved cost.
(3) carrier communication mode of the present invention is modulated in different ways, all in conjunction with digital filtering, can effectively other frequency noises of filtering to the interference of selected carrier communication mode.
(4) the present invention adopts the mode of two-stage pi type filter cascade, and in communication band, the amplitude-frequency characteristic of each frequency carrier signal is consistent with phase-frequency characteristic, can adapt to different carrier communication modulation algorithm.
(5) pi type filter level of the present invention is associated in input impedance and output impedance in selected passband is all Low ESR, and adapt to effective transmission that low-voltage power line Low ESR environment realizes carrier signal, the passband of filtering is simultaneously disturbed outward, ensures effective reception of carrier signal.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Fig. 1 is that the present invention forms schematic diagram;
Fig. 2 is use principle figure of the present invention;
Fig. 3 is the circuit diagram of two-stage pi type filter cascade;
Fig. 4 is the schematic diagram of the present invention when using.
Embodiment
As shown in Figures 1 to 3, be that a kind of low voltage power line carrier interconnects device, comprise:
Carrier receiving module, for receiving low voltage power line carrier signal;
Modulation system selects module, for the demodulation modes according to carrier communication mode control frequency demodulation module;
Frequency demodulation module, for demodulation carrier signal and by the restituted signal that obtains after demodulation to carrier communication apparatus transmission;
The carrier signal input of carrier receiving module is used for being connected with the carrier signal output of low-voltage power line, the carrier signal output of carrier receiving module is connected with the carrier signal input of frequency demodulation module, and modulation system selects the control signal output of module to be connected with the control signal input of frequency demodulation module; Carrier receiving module receives low voltage power line carrier signal, and this carrier signal is sent to modulation system selection module, modulation system selects module according to the demodulation modes of carrier communication mode control frequency demodulation module, frequency demodulation module demodulation carrier signal, and by the restituted signal that obtains after demodulation by restituted signal output to carrier communication apparatus transmission, and carry out carrier signal response after it is resolved.
The present invention in use, the low voltage power line carrier of the present invention carrier signal input interface of device that interconnects is connected with the carrier signal input of carrier receiving module, and low voltage power line carrier interconnects, the restituted signal output interface of device is connected with the restituted signal output of frequency demodulation module, the carrier signal input of device of being interconnected by low voltage power line carrier to be connected on low-voltage power line to receive the carrier signal of low-voltage power line, is namely connected respectively on the zero line 1 and live wire 2 of low-voltage power line; And the interconnect restituted signal output interface of device of low voltage power line carrier is connected with carrier communication apparatus, on the zero line 1 that the output interface of carrier communication apparatus correspondence is connected to low-voltage power line and live wire 2, see Fig. 2.
In the present embodiment, carrier receiving module adopts two-stage pi type filter cascade system, and in communication band, the amplitude-frequency characteristic of each frequency carrier signal is consistent with phase-frequency characteristic, can adapt to different carrier communication modulation algorithm.Pi type filter cascade is made up of two capacitors and an inductor, one end of capacitor connects one end of another capacitor by inductor, the other end of two capacitors is connected with the carrier signal input of carrier receiving module, and the two ends of inductor are connected with the carrier signal output of carrier receiving module.As shown in Figure 3, the cascade of two-stage pi type filter comprises resistance R, electric capacity C1, C2, C3, C4, inductor L1, L2 and fuse V1, in the cascade of first order pi type filter, one end of electric capacity C1 connects one end of capacitor C2 by inductor L1, the other end of electric capacity C1, C2 connects carrier signal input respectively by fuse V1, resistance R; In the pi type filter cascade of the second level, one end of electric capacity C3 connects one end of capacitor C4 by inductor L2, the other end of electric capacity C3, C4 connects the two ends of inductor L1 respectively, and the two ends of inductor L2 connect carrier signal output; In selected passband, input impedance and output impedance are all Low ESR, and adapt to effective transmission that low-voltage power line Low ESR environment realizes carrier signal, the passband of filtering is simultaneously disturbed outward, ensures effective reception of carrier signal.
Frequency demodulation module adopts digital form demodulation carrier signal, and obtain the symbol signal corresponding to different modulating algorithm, symbol signal is restituted signal.Demodulation mode makes digitally, and not needing increases different analogue devices for different modulating mode, has saved cost.
When carrier communication mode adopts FSK modulation, frequency demodulation module obtains symbol signal with the statistical signal cycle in conjunction with the side of digital filtering; When carrier communication mode adopts PSK modulation, the mode that frequency demodulation module changes in conjunction with digital filtering with statistical signal phase place obtains symbol signal; When carrier communication mode adopts OFDM modulation, frequency demodulation module obtains symbol signal with FFT in conjunction with the mode of digital filtering; Digital filtering refers to the signal intensity when there is not meeting selected carrier communication mode, substitutes with the signal intensity meeting selected carrier communication mode.Can effectively other frequency noises of filtering to the interference of selected carrier communication mode.
As shown in Figure 4, when different low-voltage powerline carrier communication scheme communicates, producer 1 uses FSK modulation mode, and producer 2 uses OFDM modulation mode.The present invention's device 1 that interconnects selects carrier communication mode to be OFDM modulation; the OFDM carrier signal that it receives removes protection interval; after transformation from serial to parallel; FFT is used to obtain in conjunction with the mode of digital filtering; finally symbol signal is transferred to carrier communication apparatus 1; after being resolved by carrier communication apparatus 1, carry out the carrier signal response of FSK modulation.Equally, the device 2 that interconnects selects carrier communication mode to be FSK modulation, the FSK carrier signal Using statistics signal period that it receives obtains symbol signal in conjunction with the mode of digital filtering, finally symbol signal is transferred to carrier communication apparatus 2, after being resolved by carrier communication apparatus 2, carry out the carrier signal response of OFDM modulation.Demodulation mode and filtering mode all use pure digi-tal mode, and not needing increases different analogue devices for different modulating mode, ensure that the feasibility of the device that interconnects while cost-saving.
Finally it should be noted that, above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that; It still can be modified to the technical scheme described in previous embodiment, or carries out equivalent replacement to wherein portion of techniques feature; Such as: the cascade of two-stage pi type filter, carrier communication mode etc. also have other equivalent substitute mode; Therefore, these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of embodiment of the present invention technical scheme.
Claims (5)
1. low voltage power line carrier interconnects a device, it is characterized in that comprising:
Carrier receiving module, for receiving low voltage power line carrier signal; Described carrier receiving module adopts two-stage pi type filter cascade system, and in communication band, the amplitude-frequency characteristic of each frequency carrier signal is consistent with phase-frequency characteristic, can adapt to different carrier communication modulation algorithm; Described pi type filter cascade is made up of two capacitors and an inductor, one end of described capacitor connects one end of another capacitor by inductor, the other end of two capacitors is connected with the carrier signal input of carrier receiving module, and the two ends of described inductor are connected with the carrier signal output of carrier receiving module;
Modulation system selects module, for the demodulation modes according to carrier communication mode control frequency demodulation module;
Frequency demodulation module, for demodulation carrier signal and by the restituted signal that obtains after demodulation to carrier communication apparatus transmission;
The carrier signal input of described carrier receiving module is used for being connected with the carrier signal output of low-voltage power line, the carrier signal output of described carrier receiving module is connected with the carrier signal input of frequency demodulation module, and described modulation system selects the control signal output of module to be connected with the control signal input of frequency demodulation module; Described carrier receiving module receives low voltage power line carrier signal, and this carrier signal is sent to modulation system selection module, modulation system selects module according to the demodulation modes of carrier communication mode control frequency demodulation module, described frequency demodulation module demodulation carrier signal, and by the restituted signal that obtains after demodulation by restituted signal output to carrier communication apparatus transmission, and carry out carrier signal response after it is resolved.
2. low voltage power line carrier according to claim 1 interconnects device, it is characterized in that: described frequency demodulation module adopts digital form demodulation carrier signal, obtain the symbol signal corresponding to different modulating algorithm, described symbol signal is described restituted signal.
3. low voltage power line carrier according to claim 2 interconnects device, it is characterized in that: described carrier communication mode adopts FSK modulation, and described frequency demodulation module obtains described symbol signal with the statistical signal cycle in conjunction with the side of digital filtering.
4. low voltage power line carrier according to claim 2 interconnects device, it is characterized in that: described carrier communication mode adopts PSK modulation, and described frequency demodulation module obtains described symbol signal with the change of statistical signal phase place in conjunction with the mode of digital filtering.
5. low voltage power line carrier according to claim 2 interconnects device, it is characterized in that: described carrier communication mode adopts OFDM modulation, and described frequency demodulation module obtains described symbol signal with FFT in conjunction with the mode of digital filtering.
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| CN2836126Y (en) * | 2005-08-12 | 2006-11-08 | 天然I.C.有限公司 | Net-bridge power meter |
| CN101453800B (en) * | 2007-11-30 | 2012-08-08 | 株式会社Ntt都科摩 | Bidirectional data transmission processing method for multi-hop relay system and communication intermediate apparatus |
| CN102195679B (en) * | 2010-03-10 | 2013-10-16 | 青岛东软载波科技股份有限公司 | Power line carrier modulation method, demodulation method, circuit and chip |
| CN201994936U (en) * | 2011-04-01 | 2011-09-28 | 广东浩迪创新科技有限公司 | Multi-carrier communication conversion module for power line |
| CN102571654B (en) * | 2011-12-31 | 2014-08-13 | 上海贝岭股份有限公司 | Multi-carrier frequency self-adaptive power line communication system and method |
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