Full-band power line carrier communication system

Abstract

The invention discloses a full-band power line carrier communication system, which comprises a BPLC processor, a BPLC transmit-receive circuit and a BPLC coupling circuit. BPLC refers to broadband power line carrier communication. The system also comprises a narrow-band carrier sending circuit, a narrow-band carrier receiving circuit, a narrow-band signal coupling circuit and a zero cross circuit. The narrow-band carrier sending circuit and the narrow-band carrier receiving circuit are arranged between the narrow-band signal coupling circuit and the BPLC processor; the narrow-band signal coupling circuit is connected with a power line; the narrow-band carrier sending circuit and the narrow-band carrier receiving circuit are connected with pins of the BPLC processor; the input end of the zero cross circuit is connected with the power line; and the output end of the zero cross circuit is connected with an IO port of the BPLC processor. The full-band power line carrier communication system can improve success rate of meter reading obviously, and the meter reading efficiency is high.

Description

technical field [0001] In particular, the invention relates to a full-band power line carrier communication system, which is used for data transcription of meters. Background technique [0002] Since 1996 in China, some manufacturers have begun to study power line carrier communication for power line meter reading. By 2006, the number of companies concerned with power line carrier communication has increased rapidly, but most of them use general-purpose single-chip microcomputers and develop software inside the single-chip microcomputer to realize power line carrier. Modulation and demodulation, the carrier communication method developed in this way is called narrowband carrier, because its communication bandwidth ranges from 3K-50KHz, the bandwidth is narrow, and the communication rate ranges from 50bps-5.4kbps, but because of its The interference from the power grid is relatively large, and the success rate of point-to-point is not high. Especially during the peak period o...

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Problems solved by technology

[0002] Since 1996 in China, some manufacturers have begun to study power line carrier communication for power line meter reading. By 2006, the number of companies concerned with power line carrier communication has increased rapidly, but most of them use general-purpose single-chip microcomputers and develop software inside the single-chip microcomputer to realize power line carrier. Modulation and demodulation, the carrier communication method developed in this way is called narrowband carrier, because its communication bandwidth ranges from 3K-50KHz, the bandwidth is narrow, and the communication rate ranges from 50bps-5.4kbps, but because of its The interference of the power grid is relatively large, and the success rate of point-to-point is not high. Especially during the peak period of power consumption of the power grid, it is basically impossible to read the data. Therefore, the meter reading of residential users chooses to start at 0 o'clock in the morning every day.

[0003] With the call of the country to build a strong smart grid, this communication method cannot carry larger data transmission and reception due to its low communication rate. The market needs a communication technology with a faster speed and a higher success rate. International Qualcomm, mstar, and domestic Huawei HiSilicon successively recommended broadband power line carrier communication chips based on the international standard Homeplug. The communication frequency range is 2MHz-30MHz, and the maximum communication rate can reach 1Gbps. The frequency is high, and the signal attenuates quickly on the power line. At the same time, when the power line is buried, the communication distance is very short, which is only suitable for internal use in the home.

In order to apply this technology to power line carrier meter reading, the communication rate of broadband carrier can be reduced to 10Mbps. In extreme environments, the communication rate can be reduced to 3Mbps, and the point-to-point communication distance has been improved. In the distribution station area with a relatively poor environment, especially in the case of buried lines all over the ground, the communication success rate is very low, and the meter reading needs of all situations cannot be met.

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