CN2555590Y - Digital pulse intervally modulated power line carrier communication transmitting/receiving appts. - Google Patents

Abstract

The utility model relates to an electric power line communication data sending-receiving device for a carrier digital pulse interval modulation C-DPIM. The device is formed by mutually linking an electric power line carrier wave signal coupling circuit, a power amplifying circuit, a carrier wave signal sending circuit, a carrier wave signal receiving and filtering circuit, a relevant carrier wave signal detecting circuit that is a carrier wave monitor and a singlechip controller circuit. The sending-receiving device has strong resisting function towards the complex variable background noise and strong interference of the electric power line network. Compared with the prior electric power line data communicating method, the utility model has obvious improvement at the aspect of the cost performance.

Description

Digit pulse is modulation electric powerline carrier communication R-T unit at interval

Technical field

The utility model relates to a kind of carrier number word pulse and modulates C-DPIM (carrier digital pulseinterval modulation) power line data communication R-T unit at interval.

Background technology

The low-voltage power network is developed to is the information Access Network, it is low to utilize electrical network to carry out the new technology cost of data communication reliably at a high speed, and it is convenient to implement, and is the focus of present people's research.At present, computer, the communication technology, microcontroller technology combine and infiltration with the close of consumption electronic product, make home electric production progressively step into home automation, and the organic integration of Internet appliance product has then formed home network.In home network, its transmission signals can be divided into two classes, and the one, low speed signal, the less demanding water, electricity, gas amr message of, real-time less, the control of traditional home appliance such as electric light, air-conditioning, information such as antitheft, fireproof alarming as control command and data volume.Another kind is a high speed signal, as video, audio signal etc.

Because the time variation of low-voltage power spider lines, decay are big (when especially electrical load is capacitive, the carrier communication signal is close to short circuit) and the existence of various complicated disturbance noises, make that power-line carrier communication is difficult to be applied for a long time at home.Utilize low-tension network to carry out carrier communication, the power carrier special chip that adopts has LM1893 at present, ST7536, ST7537 etc., though they have taked some interference protection measures at the characteristic of channel of power line, its modulation-demodulation technique that adopts is the FSK mode that falls behind, the communications distance is still shorter, in the distance range of hundreds of rice, be difficult to accomplish normal reception, can't transmit information during peak of power consumption and cause the paralysis, do not reach practical requirement.SSC P300 is the power line carrier MODEM chip that INTELLON company adopts up-to-date communication technology design, it has adopted spread spectrum (CHIRP mode) modulation-demodulation technique, the CEBUS agreement of Modern DSP technology and standard, but its power line carrier communication result of use in field and not obvious such as check meter at home.Trace it to its cause, SSC P300 designs at north America region frequency standard, electrical network characteristic and home automation (single household's formula separate house).Owing to have the strong narrow band interference and the background noise of 50HZ and multiple frequency signal thereof on the power line, China does not have American-European strict to the control of mains by harmonics in addition, the domestic electrical network characteristic of power line private communication chip technology and method incompatibility realizes normal data communication both at home and abroad when also not having a kind of real suitable China's low-voltage powerline carrier communication chip technology electrical network characteristic, reasonable price and method can accomplish to reach peak of power consumption in the distance range of hundreds of rice at present.

Summary of the invention

The purpose of this utility model provides a kind of power line data communication R-T unit that is applicable to China's power line electrical network characteristic, background noise and the periodicity strong jamming complicated and changeable to power line network have strong inhibitory action, compare with existing power line data communications method, aspect the ratio of performance to price, be significantly improved.

The utility model power line data communication R-T unit is by power line carrier signal coupling circuit, power amplification, carrier signal transtation mission circuit, the carrier signal circuit that accepts filter, carrier signal correlation detecting circuit (being the carrier monitoring device), the singlechip controller circuit interconnects and forms (as shown in Figure 1).Physical circuit is connected to: power line carrier signal coupling circuit is in series with the elementary of coupling transformer T1 after by a resistance capacitance R16, C22 parallel connection; Constitute power amplification, carrier signal transtation mission circuit by ternary computing amplification circuit IC3 and AC signal coupling circuit C10, RI1, output the 3rd, 6 pin of IC3 are connected with the secondary of transformer T1 through AC signal coupling circuit C10, RI1, the 6th and 11 pin of R100 cross-over connection IC3, the 9th pin of IC3 connects the collector electrode of Q10, and the 11st pin links to each other with the 14th pin of IC2 after R12 and C11 serial connection; NPN transistor amplifier (Q2, R9, R15, D1, Q4, input R10) connect π type low pass filter (L3, C17, C18), again through high pass filter (C15, L4), surge absorbing circuit (D4, D5), the clamped circuit (D2 of level, D3) be connected with the secondary of transformer T1, the collector electrode of Q2 connects the 11st pin of IC2, forms the carrier signal circuit that accepts filter; Integrated circuit (IC) 2, R103, R104 etc. constitute the carrier monitoring device, and R103 connects the 6th, 19 pin of IC2, and the 6th pin of integrated circuit (IC) 2 connects power supply through R104, and the 11st pin of IC2 connects the base stage of Q10 through R102, and the 17th pin links to each other with the collector electrode of Q2; The 6th pin of single-chip microcomputer integrated circuit (IC) 1 links to each other with the 7th pin of IC2, and the 7th pin links to each other with the 8th pin of IC2, and the 8th pin links to each other with the 12nd pin of IC2.

During transmission, the data transaction that single-chip microcomputer will send becomes the DPIM sign indicating number, and link to each other with the 8th pin of IC2 from the 7th pin output DPIM pulsing control signal, IC2 receives behind this signal that from the 14th pin outgoing carrier signal through C11, RI2 links to each other and is coupled on the power line with power amplification, carrier signal transtation mission circuit and power line carrier signal coupling circuit and transmits.

During reception, carrier wave Chirp waveform signal links to each other with the 17th pin of carrier monitoring device IC circuit 2 through power line carrier signal coupling circuit, the carrier signal circuit that accepts filter, the carrier monitoring device receives that the laggard line correlation of this signal detects judgement outgoing carrier monitor signal and links to each other with single-chip microcomputer the 6th pin through the 7th pin, single-chip microcomputer is received behind this signal and further to be finished the decoding of DPIM signal by software with this pulse signal as DPIM.

A large amount of experiment and analysis results show that it is stronger to the interference rejection capability of low-voltage power spider lines that the utility model carrier number word pulse is modulated C-DPIM power line data communication R-T unit at interval, and communication efficiency is better.Make that it becomes when being, high signal attenuation characteristic and have the train-installed low-voltage power spider lines of complicated disturbance and work-at-home low-voltage power spider lines on realized desirable communication, with compare based on CEBUS protocol of I NTELLON SSC P300 chip technology, the communication error rate has obvious reduction, can realize the low speed signal transmission such as functions such as remote data collections under a lot of powerline network environment that adopt INTELLON SSC P300 chip can not realize correct communication, transmission speed can reach 5KBPS at present.The C-DPIM power-line carrier communication has a wide range of applications in industrial automation field bus control system, family's building automation system, long-distance meter-reading system.

Adopt carrier number word pulse interval modulation electric line of force transceiver communication device to do the mass communication experiment at experiment building, residential quarters, train 380V low-voltage power spider lines, effect is obvious.The continuous experimental period of each experiment is 17 hours, and total bit number of transmission is 10000000.Carry out the microcomputer chamber of 380V power line network communication experiment in disturbing bigger 20m scope, experiment building, and C-DPIM R-T unit and SSC P300 transceiver (CEBUS agreement) transmission error rates are respectively 0.09% and 18.5%.Two communication point of experiment building 380V power line network communication experiment in building, Building to five 1, building 350m line scope are carried out, and C-DPIM R-T unit and SSC P300 transceiver (CEBUS agreement) transmission error rates are respectively 1.75% and 99.9%.Train 380V low-voltage power line network service experiment is carried out in adjacent two joint compartments, and C-DPIM R-T unit and SSC P300 transceiver (CEBUS agreement) transmission error rates are respectively 0.77% and 99.9%.Train 380V low-voltage power line network service experiment is carried out between two compartments of 4 joint cars that are separated by, and C-DPIM R-T unit and SSC P300 transceiver (CEBUS agreement) transmission error rates are respectively 2.79% and 100%.The result shows that in peak times of power consumption, the power line load increases, and signal attenuation is big, and disturbing increases, and transmission error rates rises.In addition, when communication distance increased, power line produced more high attenuation and distortion to signal, and transmission error rates is increased, thereby had caused the paralysis of SSC P300 communication system.And adopt the utility model carrier number word pulse interval modulation electric line of force transceiver communication device under rugged environment, still to have communication efficiency preferably.

Description of drawings

Fig. 1 is a carrier number word pulse modulation electric line of force transceiver communication schematic diagram of device at interval.

Embodiment

Among Fig. 1, the model that single-chip microcomputer integrated circuit (IC) 1 adopts is P87PLC759, and the model that integrated circuit (IC) 2 adopts is SSC P485 or LM1893, and the model that ternary computing amplification circuit IC3 adopts is TLE2310.

Claims (2)

1, a kind of digit pulse modulation electric powerline carrier communication R-T unit at interval, it is characterized in that this device is by power line carrier signal coupling circuit, power amplification, carrier signal transtation mission circuit, the carrier signal circuit that accepts filter, carrier signal correlation detecting circuit and singlechip controller circuit interconnect and form.

2, a kind of digit pulse as claimed in claim 1 modulation electric powerline carrier communication R-T unit at interval is characterized in that the physical circuit of this device is connected to: the power line signal coupling circuit is in series with the elementary of coupling transformer T1 after by a resistance capacitance R12, C22 parallel connection; By ternary computing amplification circuit IC3 and AC signal coupling circuit (C10, RI1) constitute power amplification, carrier signal transtation mission circuit, output the 3rd, 6 pin of IC3 are connected with the secondary of transformer T1 through AC signal coupling circuit C10, RI1, the 6th and 11 pin of R100 cross-over connection IC3, the 9th pin of IC3 connects the collector electrode of Q10, and the 11st pin links to each other with the 14th pin of IC2 after R12 and C11 serial connection; By NPN transistor amplifier (Q2, R9, R15, D1, Q4, input R10) connect π type low pass filter (L3, C17, C18), again through high pass filter (C15, L4), surge absorbing circuit (D4, D5), the clamped circuit (D2 of level, D3) be connected with the secondary of transformer T1, output connects the 11st pin of IC2, forms the carrier signal circuit that accepts filter; Integrated circuit 1C2 and R103, R104 constitute the carrier monitoring device, and R103 connects the 6th, 19 pin of IC2, and the 6th pin of integrated circuit (IC) 2 connects power supply through R104, and the 11st pin of IC2 connects the base stage of Q10 through R102, and the 17th pin links to each other with the collector electrode of Q2; The 6th pin of single-chip microcomputer integrated circuit (IC) l links to each other with the 7th pin of IC2, and the 7th pin links to each other with the 8th pin of IC2, and the 8th pin links to each other with the 12nd pin of IC2.