CN202906903U - Low-voltage power line carrier communication system - Google Patents
Low-voltage power line carrier communication system Download PDFInfo
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- CN202906903U CN202906903U CN 201220575273 CN201220575273U CN202906903U CN 202906903 U CN202906903 U CN 202906903U CN 201220575273 CN201220575273 CN 201220575273 CN 201220575273 U CN201220575273 U CN 201220575273U CN 202906903 U CN202906903 U CN 202906903U
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- circuit
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- power line
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Abstract
The utility model discloses a low-voltage power line carrier communication system. The signal transmission mode includes sequentially transmitting signals to a CPU, a power amplification circuit, a current shaping circuit, an isolation coupling circuit and a low-voltage power line; and the signal receiving mode includes sequentially receiving signals from the low-voltage power line, the isolation coupling circuit, a band-pass filter, a mixing frequency-selecting circuit, a demodulator and the CPU. According to the low-voltage power line carrier communication system, the anti-interference capacity of carrier communication is promoted and the carrier communication effect is obviously improved through filtration of the band-pass filter circuit of the hardware, mixing of triangular wave and redundant data filtration of the software; and after conducting the interference test according to pulse train testing standards of the electricity meter alternating current power supply, the carrier communication can be carried out normally.
Description
Technical field:
The utility model relates to a kind of low voltage power line carrier technology, relates in particular to a kind of low-voltage powerline carrier communication system.
Background technology:
Utilize low-voltage power line as carrier, realize between concentrator and the electric energy meter, or electric energy meter data communication each other, thereby reach the purpose of copy reading electric energy meter data or control electric energy meter.This kind communication mode, do not need to set up special-purpose order wire, both reduced the wiring complexity of electric energy meter, reduce construction volume, can reduce again the maintenance of electric energy meter erecting bed, improve safety and the degree of reliability of power supply system, realized simultaneously by carrier communication electric energy meter being carried out the requirement of intelligent management.Because low-voltage power line is not special-purpose order wire, its noise jamming is very serious, and current existing voltage power-line carrier communication technology and imperfection, poor anti jamming capability, the carrier communication effect is unsatisfactory.
The utility model content:
The purpose of this utility model is exactly the problem that has overcome existing carrier communication poor anti jamming capability, proposes a kind of low-voltage powerline carrier communication system.
The technical scheme that the utility model adopts: a kind of low-voltage powerline carrier communication system, comprise CPU, isolation coupling circuit, power amplification circuit, current shaping circuit, band pass filter, mixing frequency selection circuit, intermediate frequency amplifier circuit, demodulator, wherein: the cpu signal output links to each other with power amplification circuit, power amplification circuit links to each other with the current shaping circuit, and the current shaping circuit links to each other with the isolation coupling circuit; The isolation coupling circuit links to each other with band pass filter, band pass filter links to each other with the mixing frequency selection circuit, and the mixing frequency selection circuit links to each other with intermediate frequency amplifier circuit, and the mixing frequency selection circuit also links to each other with the cpu signal output, intermediate frequency amplifier circuit links to each other with demodulator, and demodulator links to each other with the cpu signal input.
During the reception carrier signal, carrier signal is at first passed through the band-pass filter of hardware, has filtered out most interference noise; In the mixing frequency selection circuit, mixed frequency signal adopts triangular signal, and in the situation of serious interference, triangular signal is more stable than sine wave signal; Information after the demodulation is further carried out redundant data contrast correction process in CPU inside again with software, thereby restores the True Data before the modulation.
Useful good effect of the present utility model: the redundant data filtering of band-pass filter, triangular wave mixing and software by hardware, promoted the antijamming capability of carrier communication, the carrier communication effect significantly improves.Impulse train experimental standard by the electric energy meter AC power carries out disturbed test, and carrier communication can normally be carried out.
Description of drawings:
Fig. 1 is the theory diagram of the utility model low-voltage powerline carrier communication system.
Embodiment:
Embodiment one: referring to Fig. 1, the low-voltage powerline carrier communication system is comprised of isolation coupling circuit, power amplification circuit, current shaping circuit, band pass filter, mixing frequency selection circuit, intermediate frequency amplifier circuit, demodulator, CPU.
CPU links to each other with power amplification circuit, and power amplification circuit links to each other with the current shaping circuit, and the current shaping circuit links to each other with the isolation coupling circuit; The isolation coupling circuit links to each other with band pass filter, and band pass filter links to each other with the mixing frequency selection circuit, and the mixing frequency selection circuit links to each other with intermediate frequency amplifier circuit, and the mixing frequency selection circuit also links to each other with CPU, and intermediate frequency amplifier circuit links to each other with demodulator, and demodulator links to each other with CPU.
In Fig. 1, CPU has PWM (pulse width modulation) function.By software control, information to be modulated with PWM, modulation system is BFSK (digital frequency modulation), form the carrier information of spread spectrum, here, the dominant frequency of CPU is 15.66MHz, the centre frequency of modulating wave is 237.49KHz, bandwidth 14.39KHz, rate of information throughput 312.5BPS.
Carrier information after the modulation sends to power amplification circuit by CPU and carries out power amplification, and the current shaping circuit that is comprised of inductance capacitance afterwards carries out current shaping, to reduce high order harmonic component.Signal behind the current shaping is delivered to the isolation coupling circuit, by the isolation coupling circuit carrier information is transferred on the low-voltage power line.So just finish the modulation of information and sent transmission.
During the reception carrier signal, carrier signal is at first passed through the band-pass filter of hardware, has filtered out most interference noise; In the mixing frequency selection circuit, mixed frequency signal adopts triangular signal, and in the situation of serious interference, triangular signal is more stable than sine wave signal; Information after the demodulation is further carried out redundant data contrast correction process in CPU inside again with software, thereby restores the True Data before the modulation.
Carrier information on the low-voltage power line is transferred to band pass filter and carries out filtering through the isolation coupling circuit, and the centre frequency of band pass filter is 237.5KHz.Deliver to the mixing frequency selection circuit through the filtered carrier information of band pass filter, with come the triangular wave frequency signal stack to the 217.5KHz of CPU and carry out the mixing frequency-selecting, obtain the frequency signal of 455KHz, this signal is sent into intermediate frequency amplifier to carry out sending into demodulator after signal amplifies, the signal that demodulator demodulates is sent into CPU, software by CPU carries out redundant data contrast correction process, restores the front True Data of modulation.So just finished the reception of information.
The carrier module that uses this ZAP to make is applied on state's net electric energy meter, and carrier communication is good, copies control electric energy meter success rate height, produces a desired effect.
Claims (1)
1. low-voltage powerline carrier communication system, comprise CPU, isolation coupling circuit, power amplification circuit, current shaping circuit, band pass filter, mixing frequency selection circuit, intermediate frequency amplifier circuit, demodulator, it is characterized in that: the cpu signal output links to each other with power amplification circuit, power amplification circuit links to each other with the current shaping circuit, and the current shaping circuit links to each other with the isolation coupling circuit; The isolation coupling circuit links to each other with band pass filter, band pass filter links to each other with the mixing frequency selection circuit, and the mixing frequency selection circuit links to each other with intermediate frequency amplifier circuit, and the mixing frequency selection circuit also links to each other with the cpu signal output, intermediate frequency amplifier circuit links to each other with demodulator, and demodulator links to each other with the cpu signal input.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220575273 CN202906903U (en) | 2012-10-16 | 2012-10-16 | Low-voltage power line carrier communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220575273 CN202906903U (en) | 2012-10-16 | 2012-10-16 | Low-voltage power line carrier communication system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202906903U true CN202906903U (en) | 2013-04-24 |
Family
ID=48127519
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220575273 Expired - Fee Related CN202906903U (en) | 2012-10-16 | 2012-10-16 | Low-voltage power line carrier communication system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202906903U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103475390A (en) * | 2013-09-11 | 2013-12-25 | 吴德葆 | Low-voltage power line carrier communication system |
-
2012
- 2012-10-16 CN CN 201220575273 patent/CN202906903U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103475390A (en) * | 2013-09-11 | 2013-12-25 | 吴德葆 | Low-voltage power line carrier communication system |
| CN103475390B (en) * | 2013-09-11 | 2016-03-02 | 吴德葆 | low-voltage power line carrier communication system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130424 Termination date: 20151016 |
|
| EXPY | Termination of patent right or utility model |