CN202535353U

CN202535353U - Quadrature modulation power line carrier communication system

Info

Publication number: CN202535353U
Application number: CN2012200650400U
Authority: CN
Inventors: 隋晓红; 刘建霞; 王艳营
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-02-27
Filing date: 2012-02-27
Publication date: 2012-11-14
Anticipated expiration: 2022-02-27

Abstract

The utility model relates to a quadrature modulation power line carrier communication system. The system is characterized in that a LPC2132 is connected with a FSK modulator of a ST7538P, the FSK modulator is connected with an AD835 through a relay II, a RF2713 is connected with a FSK demodulator of the ST7538P, the RF2713 is connected with a power line interface through a relay I, and the power line interface is used to connect the modulation and demodulation module to a power-line network. According to the quadrature modulation power line carrier communication system, a communication method in which power lines are adopted as the communication media is involved. According to the present patent, through the combination with practical situations, analysis is performed on indoor power line channel characteristics from three aspects including transmission line characteristics, channel noise and channel attenuation of the power lines, based on the channel characteristics in which indoor power lines are taken as the communication media, a short-distance transmission signal low-voltage narrow band power line communication based on a quadrature modulation method is designed, the antijamming capability of the system is improved, the realizability is enhanced, and a good network basis and a solution will be provided for realizing automatic power grid placement and power information platform construction in our country.

Description

The quadrature modulation power-line carrier communication system

Technical field

The utility model relates to a kind of power line communication, is applied to remote meter reading, distribution automation, marketing automation, load side management, home intelligence, short-range communication access etc.

Background technology

PLC (Power-line Communications) is as a kind of communication mode of communication medium with power line.Because the popularity of electric force lines distribution, this communication mode is at home and abroad all extensively paid close attention to.Especially transmission data, control signal in closely, power line communication with the obvious advantage can be used as a kind of preferred communication mode under many circumstances.The development of PLC has spurred the covering of network to huge numbers of families.The easy construction of PLC technology, use are flexibly; Can utilize existing power network this widely infrastructure be linked into each family to broadband network; Save the repeated construction on access way; Both can solve electric power system distribution automation access issues, for numerous rural subscribers and west area the communications of reducing investment outlay mode was provided again; For advancing China's digitlization process will produce positive effect, will a good network basis and solution be provided for electrical network the placing automation, the construction power informatization platform of realizing China.

LPC2132 is based on a microcontroller of supporting 32 ARM7TDMI-S CPU of real-time simulation and embedded tracking, and has the high speed Flash memory that 64KB embeds.The memory interface of 128 bit widths can move code with unique accelerating structure under maximum clock speed.

Summary of the invention

The purpose of the utility model is to utilize the LPC2132 chip to realize having the electric line communication system of quadrature modulation demodulation performance, realizes closely interior power line communication.Comprise communicating by letter between the communicating by letter of electric line communication system with quadrature modulation demodulation performance, ST7538P and master controller, master controller and the computer.Through field assay and a large amount of reference of both at home and abroad power line channel being studied; Analyze from the tripartite indoor power line characteristic of channel of facing of transmission line characteristics, interchannel noise and the fading channel of power line; Be the basis with indoor power line as the characteristic of channel of communication media, design a kind of low pressure arrowband power line communication of short range transmission signal based on the quadrature modulation mode.

LPC2132 links to each other with the FSK modulator of ST7538P; The FSK modulator links to each other with AD835 through relay II; RF2713 links to each other with the fsk demodulator of ST7538P; RF2713 links to each other with power line interface through relay I, and described power line interface is that the modulation module is connected to power line network.

Description of drawings

Fig. 1 has the electric line communication system block diagram of quadrature modulation demodulation performance

The signal of communication connection layout of Fig. 2 LPC2132 and ST7538P

The communication link map interlinking of Fig. 3 LPC2132 and computer.

Embodiment

Execution mode below in conjunction with description of drawings the utility model.

Like Fig. 1 is the electric line communication system block diagram with quadrature modulation demodulation performance.When sending signal, control signal (control signal dots among the figure) is sent at LPC2132 position 11, and the digital signal that will send is simultaneously sent into the FSK modulator at ST7538P position 12; Deliver to orthogonal signalling through the sinusoidal signal after the FSK modulation and produce network; The control signal that send at position 11 also makes " B " end conducting at " relay I " position 13; At this moment the two-way quadrature i/q signal position 14 that produces gets into the frequency mixer at RF2713 position 14; By medium frequency output end output (6,7 pin at position 15), send at last through power line interface.

When receiving signal (operating state of system default is to receive signal), " A " conducting at position 13; 1,3 pin at position 15 links together simultaneously, and intermediate-freuqncy signal is sent into frequency mixer, and the signal that quadrature demodulation goes out is by 9 pin (I output) output at position 15; At this moment signal or fsk modulated signal are then sent into the fsk demodulator at position 12, and the digital signal after the demodulation is delivered to position 11 and handled.

" relay II " position 17 is the switchings that realize position 15 local oscillator input signals; The output that AD835 position 16 is used at position 15 when receiving signal is as local oscillation signal; The output of the clock at 15 use positions 12, position is as local oscillation signal when sending signal.

Fig. 2 is the signal of communication connection layout of LPC2132 and ST7538P, and position 21 is LPC2132, and position 22 is ST7538P.Communicating by letter between position 21 and the position 22, the register through revising position 22 can convert the communication mode of itself and controller into synchronous communication.In this mode, position 21 must be as slave unit, because synchronizing clock signals is provided by the position 22 as main equipment.During emission state, digital signal from the position 21 MISO 0 delivery outlet deliver to the TxD input port at position 22.During accepting state, restituted signal from the position 22 RxD delivery outlet demodulated output data deliver to MOSI 0 input port at position 21.Because unified synchronizing clock signals is arranged in data transmission procedure, therefore the error rate of this communication mode is very low.

Fig. 3 is the communication link map interlinking of LPC2132 and computer, and communicating by letter between master controller and the computer is described.Serial ports (UART0) position 33 of designing computed RS232 serial ports (9 pin) position 31 and LPC2132 communicates.Because position 31 level and controller I/O mouth level are variant, therefore need carry out level conversion with MAX232 serial port chip position 32.During emission state, data are the output of 31 the 3rd pin from the position, through delivering to the RxD0 input port at position 33 after the level conversion; The RxD0 mouth dateout at position 33 is through delivering to the 2nd pin at position 31 during accepting state after the level conversion.The ground at position 31, position 32, position 33 will be received together.

Above content is the further explain that combines concrete preferred implementation that the utility model is done, and can not assert that the practical implementation of the utility model is confined to these explanations.For the those of ordinary skill of technical field under this, under the prerequisite that does not break away from the utility model design, can also make some simple deduction or replace, all should be regarded as belonging to the definite scope of patent protection of claims that the utility model is submitted to.

Claims

1. a kind of quadrature modulation power-line carrier communication system is provided; It is characterized in that LPC2132 links to each other with the FSK modulator of ST7538P; The FSK modulator links to each other with AD835 through relay II; RF2713 links to each other with the fsk demodulator of ST7538P, and RF2713 links to each other with power line interface through relay I, and described power line interface is that the modulation module is connected to power line network.