CN102045086A - Power line carrier wave communication method based on ARM7 and ST7538 - Google Patents
Power line carrier wave communication method based on ARM7 and ST7538 Download PDFInfo
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- CN102045086A CN102045086A CN2009100242283A CN200910024228A CN102045086A CN 102045086 A CN102045086 A CN 102045086A CN 2009100242283 A CN2009100242283 A CN 2009100242283A CN 200910024228 A CN200910024228 A CN 200910024228A CN 102045086 A CN102045086 A CN 102045086A
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Abstract
The invention relates to power line carrier wave communication technology, comprising a microcontroller, a modulation-demodulation chip, a power line interface and a software control program. The invention provides a new power communication method with small investment and rapid effectiveness by utilizing an AC power line as a communication line and applying the electric power carrier wave communication technology.
Description
Technical field
The present invention relates to a kind of electric line carrier communication technology.
Technical background
Automatic meter reading system mainly contains wire communication technology and power carrier communication technology at present.The wire communication technology is preponderated with its stability as conventional method, but wire communication shop lineman's journey is great, and is artificially damaged easily; Especially under the situation that residential building has built up, in the wall surface backguy, put to no little inconvenience again to resident family.
The Principle of Communication of traditional low voltage power line carrier system is as shown in Figure 1:
Data are sent by Master Communication Equipment, through communication interface modules, deposit in one section buffering area in the microcontroller processing, communicate modulation after the encoded again processing, are coupled on the power line at last.At the other end of power line, data receive to separate from power line after decoupling zero again and are transferred to the microcontroller, after communication interface to from communication equipment.In whole system, microcontroller is the core of system, and it is responsible for the coordination and the scheduling of each task in the whole system.And power line interface mainly plays the function of coupling, isolation, filtering and protection.
Summary of the invention
The objective of the invention is to, utilize AC power cord as communication line, power application carrier communication technology provides a kind of new electric power communication method.
The present invention is achieved in that by hardware system and software systems and constitutes.
Hardware system contains micro controller, modem chip, power line interface.
1. the selection of micro controller
Because have unfavorable factors such as signal attenuation is big, time variation is big, noise effect is big on the low-voltage power line, these problems cause the rising of the error rate, communication quality seriously descends.Except the communication device that chooses improves communication quality from the aspect of " firmly ", reduce outside the error rate, another kind of solution is to adopt the strong coding and decoding scheme of some error correcting capabilities, this may make that algorithm is complicated, arithmetic speed reduces and then causes traffic rate to descend, this method is comparatively harsh to the requirement of processor calculating speed, also requires little processing that stronger controlled function is arranged simultaneously.After taking into account operational capability and control performance, the present invention has selected the LP2132 single-chip microcomputer of the ARM kernel of Philip (Philips) company for use, LPC2132 is based on a microcontroller of supporting 32/16 ARM7TDMI-SCPU of real-time simulation and embedded tracking, and has the high speed Flash memory of the embedding of 64kB.The memory interface of 128 bit widths and unique accelerating structure can move 32 codes under maximum clock speed.Less encapsulation and extremely low power consumption make LPC2132 can be used for mini-system ideally, as access control and POS machine.
2. the selection of modem chip
The present invention has selected the ST7538 of SGSTHOMSON company.ST7538 can realize reliable communication under the very wide channel circumstance of noise band.The all functions that transmit and receive data that ST7538 is inner integrated by serial communication, can be connected with microprocessor easily.Inside has the automatic control of voltage and electric current is controlled automatically, as long as can be connected in the power network by small number of external devices such as coupling transformers.ST7538 is a powerful, power carrier chip that integrated level is very high, and it is the application of family and industrial environment, has taked multiple Anti-Jamming Technique.
3. power line interface is used for connecting the device to power line, is a coupling circuit--be used for the transmission and the reception of fsk signal; Also be a filtering system simultaneously--can filter out electric power signal, and noise signal and the surging signal of 220V/50Hz reliably.
Software systems of the present invention have been controlled finishing of target.
Operation principle of the present invention is: data are sent by Master Communication Equipment, through communication interface modules, deposit in one section buffering area in the microcontroller processing, communicate modulation after the encoded again processing, are coupled on the power line at last.At the other end of power line, data receive to separate from power line after decoupling zero again and are transferred to the microcontroller, after communication interface to from communication equipment.In whole system, microcontroller is the core of system, and it is responsible for the coordination and the scheduling of each task in the whole system.And power line interface mainly plays the function of coupling, isolation, filtering and protection.
The present invention utilizes AC power cord as communication line, and power application carrier communication technology provides the new method of the power communication of a kind of small investment, instant effect.
Description of drawings
Fig. 1. the system principle diagram of traditional power line carrier communication;
Fig. 2. the power line interface circuit schematic diagram of the present invention's prize;
Fig. 3. the systems soft ware schematic flow sheet.
Embodiment
Below in conjunction with accompanying drawing, narrate embodiments of the invention.
Present embodiment contains hardware: micro controller, modem chip, power line interface.The LP2132 single-chip microcomputer of the ARM kernel of selecting Philip (Philips) company for use of micro controller; The ST7538 of the selection SGSTHOMSON company of modem chip.
The circuit of power line interface is as shown in Figure 2: it at first is a coupling circuit, is used for the transmission and the reception of fsk signal; Also be a filtering system simultaneously, can filter out electric power signal, and noise signal and the surging signal of 220V/50Hz reliably.Transtation mission circuit is made of C4, C5, R3, L3, D1, D2, D3, T1, C1, L1, R1, and wherein C4, C5, R3, L3 and C1, L1, R1 constitute two band pass filters respectively, and D1, D2, D3 constitute protective circuit.The desirable resonance frequency of two band pass filters can be calculated by following formula:
Receiving circuit is made of C2, C3, R2, L2, D1, D2, D3, T1, C1, L1, R1; wherein D1, D2, D3 constitute protective circuit equally; and the reception bandwidth-limited circuit of C2, C3, a second order of R2, L2 formation, its centre frequency f0 and quality factor Q can be calculated by following formula:
Fig. 3 display system software flow.When system power-up started, system program entered the state that receives data from power line, began to detect the correctness that has that it's too late of ripple signal, whether was transformed into the Rule of judgment that receives data mode from SCI as system with this.If the carrier signal of detecting and correct, then system begins to receive the data that transmit from power line, and this moment, SCI mouth interrupt status was to power up initial value afterwards, and promptly the SCI mouth is in to receive and interrupts closing.If there is not carrier signal at the beginning, then system begins to detect the SCI mouth, judges whether the SCI mouth has data to send, and determines whether will enter data receiving state with this.If power line and SCI mouth all free of data transmit generation, then system reenters detected state, restarts to detect power line, enters new round circulation.
Being in reception and transmit status simultaneously for fear of the SCI mouth, causing data collision, is to finish with the inquiry and being provided with of interruption of status word in the program.No matter be to receive data or after the SCI mouth is received data, all will judge the situation of system channel, thereby decision is that data are passed to power line or pass to communication equipment from PL2132 from the interrupt status of SCI mouth from power line.In case data forwarding is finished, then whole system is got back to detected state, waits for the startup of new round data transmit-receive.
Low-voltage powerline carrier communication is a problem with broad prospect of application.But the low-voltage power power distribution network is an open network, when transmission signals, have decay big, disturb characteristics such as strong, impedance variation complexity, on power line, carry out at a high speed, reliable, safe data communication also has many technical problems to need research.As center processor, the communication module that realizes as modem chip with ST7538 can realize reliable communication to this scheme, has certain practical value with this a high-performance microcontroller of PL2132.
Claims (3)
1. the device for power line carrier communications based on ARM7 and ST7538 is characterized in that: contain micro controller, modem chip, power line interface;
Said micro controller is selected the LP2132 single-chip microcomputer of the ARM kernel of Philip (Philips) company for use;
Said modem chip, the ST7538 of selection SGSTHOMSON company.
Said power line interface is a coupling circuit.
2. according to the transmission method of the described device for power line carrier communications of claim 1, it is characterized in that:
When system power-up started, system program entered the state that receives data from power line, began to detect the correctness that has that it's too late of ripple signal:
If the carrier signal of detecting and correct, then system begins to receive the data that transmit from power line, and promptly the SCI mouth is in to receive and interrupts closing;
If there is not carrier signal at the beginning, then system begins to detect the SCI mouth, judges whether the SCI mouth has data to send;
If power line and SCI mouth all free of data transmit generation, then system reenters detected state, restarts to detect power line, enters new round circulation.
3. according to the transmission method of the described device for power line carrier communications of claim 2, it is characterized in that: the situation of judging system channel from the interrupt status of SCI mouth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2009100242283A CN102045086A (en) | 2009-10-10 | 2009-10-10 | Power line carrier wave communication method based on ARM7 and ST7538 |
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| CN2009100242283A CN102045086A (en) | 2009-10-10 | 2009-10-10 | Power line carrier wave communication method based on ARM7 and ST7538 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013097819A1 (en) * | 2011-12-31 | 2013-07-04 | 深圳市比亚迪汽车研发有限公司 | Electric automobile charging/discharging carrier apparatus and communication method and system |
| CN103312376A (en) * | 2012-03-15 | 2013-09-18 | 深圳光启创新技术有限公司 | Communication system based on power line and visible light |
| CN105743544A (en) * | 2014-05-26 | 2016-07-06 | 国网河南省电力公司南阳供电公司 | Interface network used for nonlinear load power grid management optimization |
-
2009
- 2009-10-10 CN CN2009100242283A patent/CN102045086A/en active Pending
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| US9718374B2 (en) | 2011-12-31 | 2017-08-01 | Shenzhen Byd Auto R&D Company Limited | Electric vehicle and charging system for electric vehicle |
| US9604545B2 (en) | 2011-12-31 | 2017-03-28 | Shenzhen Byd Auto R&D Company Limited | Carrier communication method and system based on charging-discharging of electric vehicle and carrier device |
| US9260022B2 (en) | 2011-12-31 | 2016-02-16 | Shenzhen Byd Auto R&D Company Limited | Electric vehicle and power system and motor controller for electric vehicle |
| US9272629B2 (en) | 2011-12-31 | 2016-03-01 | Shenzhen Byd Auto R&D Company Limited | Power system switching between charge-discharge function and driving function and electric vehicle comprising the same |
| US9290105B2 (en) | 2011-12-31 | 2016-03-22 | Shenzhen Byd Auto R&D Company Limited | Electric vehicle and active discharging system for electric vehicle |
| EP2800284A4 (en) * | 2011-12-31 | 2016-05-18 | Shenzhen Byd Auto R&D Co Ltd | Electric automobile charging/discharging carrier apparatus and communication method and system |
| US10173545B2 (en) | 2011-12-31 | 2019-01-08 | Byd Company Limited | Electric vehicle and discharging apparatus thereof |
| US9969290B2 (en) | 2011-12-31 | 2018-05-15 | Shenzhen Byd Auto R&D Company Limited | Charging system for electric vehicle and electric vehicle comprising the same |
| US9718373B2 (en) | 2011-12-31 | 2017-08-01 | Shenzhen Byd R&D Company Limited | Electric vehicle and discharging apparatus thereof |
| WO2013097819A1 (en) * | 2011-12-31 | 2013-07-04 | 深圳市比亚迪汽车研发有限公司 | Electric automobile charging/discharging carrier apparatus and communication method and system |
| US9493088B2 (en) | 2011-12-31 | 2016-11-15 | Shenzhen Byd Auto R&D Company Limited | Electric automobile and integrated control system thereof |
| US9796287B2 (en) | 2011-12-31 | 2017-10-24 | Shenzhen Byd Auto R&D Company Limited | Electric vehicle and discharging apparatus thereof |
| CN103312376A (en) * | 2012-03-15 | 2013-09-18 | 深圳光启创新技术有限公司 | Communication system based on power line and visible light |
| CN105743544A (en) * | 2014-05-26 | 2016-07-06 | 国网河南省电力公司南阳供电公司 | Interface network used for nonlinear load power grid management optimization |
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Application publication date: 20110504 |