KR200294000Y1 - Power line communication modem - Google Patents

Abstract

The present invention detects the spread frequency on the line of the power line, finds the band without noise generation, enables high speed communication using narrow band, and converts it into SS (Spread Spectrum) as necessary to have complementary and stable By selecting the frequency band by randomly, and by irradiating the frequency through the SS to actively avoid the noise and increase the communication speed multi-frequency and multi-way system to enable communication without abnormal changes in impedance and noisy lines It is a feature to provide this possible digital power line communication modem.

In addition, the present invention is to provide a digital power line communication modem capable of multi-frequency and multi-mode to improve the efficiency of the overall power line communication modem by maximizing the reliability and satisfaction of use to users who install and use it.

Description

Digital Power Line Communication Modem with Multi Frequency and Multi Modes

The present invention relates to a digital power line communication modem capable of multiple frequencies and multiple methods,

More specifically, it detects the spread frequency on the line of the power line, finds the band where no noise is generated, enables high-speed communication using narrow band, and converts it to Spread Spectrum (SS) as needed. By making it complete and stable, the frequency band can be arbitrarily selected, and the frequency is irradiated through the SS to actively avoid noise and increase the communication speed so that communication can be performed without abnormality in the impedance change and noisy lines. Therefore, the present invention relates to a digital power line communication modem capable of multi-frequency and multi-methods, which improves the efficiency of the overall power line communication modem, thereby maximizing reliability and satisfaction of users for installing and using the same.

In general, power lines are facilities that are installed to supply power, and their network configuration is complicated and the line characteristics are poor, making them unsuitable for use as communication networks. As described above, a technology for transmitting a communication signal superimposed on a power line is power line communication (PLC).

However, the conventional power line communication is using a variety of communication media such as general telephone line, cable TV network, optical cable network, wireless to establish a power automation system such as remote meter reading, distribution automation, demand management, etc. The optimal communication network construction method has not been established. Implementing low-voltage distribution power line subscriber networks by connecting indoors and outdoors, impedance problems due to internal loads, signal interference, noise and multipath problems, signals due to branching, etc. Due to problems such as attenuation, signal attenuation due to breakers, and impulses, it is difficult to efficiently transmit signals indoors or outdoors to indoors or outdoors.

In other words, the power line communication has a problem in that the SS method which has advantages in wireless communication is different from the communication using the wireless environment. In the case of the conventional PLL communication, the power line communication is weak to noise and weak to impulse, and the frequency is low. There is a problem that the speed is lowered, especially when the synchronization is broken by an impulse or the like, a large amount of data is lost, and the size of the hardware is increased when the hardware configuration of the tuning circuit.

In addition, since the amount of data such as remote meter reading is small but security is required and security need is weak but high speed communication is required, there is a narrow method suitable for high speed communication and security even if the communication speed drops. Since there is no power line communication modem that can be selectively used by applying the SS method having excellent performance and stability at the same time, the conventional power line communication always causes the above problems depending on the impedance on the line and the noise generated.

Therefore, the power line communication generally implemented as described above is limited in efficiency to some extent, and there are problems in that reliability of use thereof is minimized.

The present invention was created to solve all the problems of the prior art as described above has the following object.

The present invention detects the spread frequency on the line of the power line, finds the band without noise generation, enables high speed communication using narrow band, and converts it into SS (Spread Spectrum) as necessary to have complementary and stable By selecting the frequency band by randomly, and by irradiating the frequency through the SS to actively avoid the noise and increase the communication speed multi-frequency and multi-way system to enable communication without abnormal changes in impedance and noisy lines Its purpose is to provide a possible digital power line communication modem.

Another object of the present invention is to provide a digital power line communication modem capable of a multi-frequency and multi-way method to improve the efficiency of the overall power line communication modem by maximizing the reliability and satisfaction of the user to install and use.

1 is a block diagram showing to explain the present invention,

2 is an exemplary frequency diagram for a narrow band transmission signal;

3 is an exemplary frequency diagram for a spread spectrum signal;

4 is an exemplary diagram showing a spread direction of an actual waveform and spectral distribution of an operation;

Figure 5 is a schematic embodiment showing for showing the frequency change direction of the decode according to the present invention.

<Description of the code | symbol about the principal part of drawing>

10: interface unit

11: power line

20: DSP unit

30: carrier generating unit

40: constant voltage amplifier

50: coupling circuit part

60 filter unit

70: differential detection unit

80: power supply

It will be described with respect to a preferred embodiment for more specifically embodying the present invention described above.

In the following description of the present invention, if it is determined that the detailed description of the related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

The terms to be described below are terms set in consideration of functions in the present invention, which may vary depending on the intentions or customs of the producers and users who produce the power line communication modem, and the definitions should be made based on the contents throughout the present specification. .

Prior to the following description, the characteristics of the spread spectrum (SS) is because the density of the power is less influenced by other devices, as compared with the spreading code as a whole, the error of the data for the signal is small.

First, as shown in the accompanying drawings, Figure 1, Figure 1 shows a block diagram showing to explain the present invention.

That is, the present invention is in power line communication (PLC) for transmitting a communication signal superimposed on the line 11 of the power line for supplying power, RS-232 / 422/485 or SPI, to facilitate the power line communication, Interface unit 10 for easily connecting a communication line such as I2C to easily transmit the data of the signal, and confirming the signal data output from the interface unit 10, and then generating, confirming, and restoring the BCH code; A DSP unit 20 for spreading and despreading, generating a waveform of a sine wave, and generating and transmitting an arbitrary waveform according to the method of ASK, FSK (MSK) and PSK (BPSK) or SS; A carrier generator 30 for generating D / A conversion and frequency in accordance with the digital output signal of 20, and amplifying the output waveforms for the carrier generator 30 against voltage and current, carrier A constant voltage amplifier 40 for maintaining a constant, a coupling circuit unit 50 for connecting or disconnecting and insulating and connecting the power line depending on whether to transmit a signal output from the constant voltage amplifier 40, and Filter unit 60 for filtering the noise component of the frequency output when received by the coupling circuit unit 50, and filter the wideband or broadband data by band, and the frequency passed through the filter unit 60 The derivative detector 70 extracts the derivative value of the signal and transmits it to the integration and decode provided in the DSP unit 20 so that the frequency analysis and the data detection can be easily performed by software. It consists of a power supply unit 80 for applying AC and DC power.

On the other hand, the components of the present invention described above can be used in various places and can take various forms.

It is to be understood, however, that the present invention is not limited to the specific forms referred to in the above description, but rather includes all modifications, equivalents, and substitutions within the spirit and scope of the invention as defined by the appended claims. It should be understood to do.

The present invention having the above-described configuration detects an impedance through the line 11 of the power line in a power line communication (PLC) that transmits power and a communication signal by overlapping, and is easily combined with a narrow band or an SS frequency. It is made possible.

That is, in order to facilitate the power line communication, the interface unit 10 efficiently connects a communication line such as RS-232 to easily transmit data of a signal.

At this time, the DSP unit 20 receiving the signal data output from the interface unit 10 checks the signal data, generates it as a BCH code, performs a spreading code for restoring an error as necessary, and then uses a sine wave generator. Frequency is quantified and transmitted via (SWG).

As shown in FIG. 2, a carrier generator 30 generating a sine wave carrier by amplifying or arbitrarily setting a frequency according to an output signal of the DSP unit 20 may have a narrow band transmitting multiple frequencies. Generate a sine wave carrier corresponding to ASK, FSK (MSK) and PSK (BPSK) in a manner most suitable for high-speed communication, or SS (spread spectrum) as shown in FIG. Spread carriers are generated in a manner that does not affect other devices and at the same time has little data error and has security and stability for the data.

As such, the present invention can be used as a narrow band or SS, and also irradiates the frequency through the SS, but actively avoids the noise and increases the speed. Although the communication speed becomes slow, security and safety of the transmitted data can be secured.

In addition, the carrier generator 30 searches the frequency output from the DSP unit 20 to arbitrarily select a frequency band, finds a band free of noise, and narrow band and security for high speed communication. When safety is the priority, communication is possible by SS method. In case of high speed communication by the narrow band, it is easy to find frequency band without noise after transmitting and receiving SS spread signal once for frequency selection. Secure high-speed communication, and when an error is detected, the noise distribution is frequently examined to change the frequency from time to time to enable communication.

In addition, the decode of the DSP unit 20 receives the integrated signal output from the differential detector 70 and detects the change direction and the spreading order of the frequency so that the influence of noise is not affected and the data is preserved even when an impulse is generated. will be.

The decode of the DSP unit 20 automatically generates a BCH code, adds it to the data, transmits it in packet units, checks the BCH code of the received data, checks whether there is an abnormality of the data, and converts an error generated bit into the BCH. It recovers by code analysis. At first, it communicates with long packet with high efficiency compared to BCH code, and if error is frequently detected, it converts BCH code system into small packet to increase reliability and maximize data transmission efficiency. will be.

The constant voltage amplifier 40 feeds back an output signal of the coupling circuit unit 50 to maintain a constant output waveform to the carrier generator 30, and the coupling circuit unit 50. When the DSP unit 20 determines whether to connect according to the output signal, it is determined whether to transmit the signal output from the constant voltage amplifier 40.

Filtering the noise component of the frequency received by the coupling circuit unit 50 in the filter unit 60 and then transmitting it to the differential detector 70 to easily detect the soft data for easy integration and frequency discrimination. The decode of the DSP unit 20 receives the integrated signal output from the differential detector 70 and detects a change direction with respect to frequency. In order to prevent the influence of noise and to preserve data even at the time of an impulse.

That is, when detecting a phase change by a conventional Chirp method, there is a problem that is vulnerable to noise, and when an impulse is generated, there is a problem that large amounts of data are lost due to a loss of synchronization. As shown in the '7', '8' and FIG. 5, the noise change direction (A, B, C) can be detected or combined (A + B + C), respectively, to detect the noise mentioned above. At the same time, data can be preserved without losing data even when an impulse occurs.

The power supply unit 80 is to apply alternating current and direct current power so that the above-described components can be easily operated.

On the other hand, '1' shown in Figure 4 shows the distribution of the waveform of the frequency spread by the method and the spectrum spread by SS, '2' is after the power is applied, '3' is far It shows the attenuated waveform and spectrum received from the device in this case. In this case, it can be seen that data communication is possible normally, but it usually occurs in the noise or irregular area such as '4', and '5', Impulses such as '6' are also frequently generated and it can be seen that there is a frequency band incapable of communication.If such an interference area and a carrier for communication are overlapped, communication becomes impossible, and if an area without such an interference element is selected and communicated, It can be seen that even in the narrow band, high speed communication can be performed without interference.

Therefore, as shown in '4' of FIG. 4, a spreading code is generated initially, and then a communication is performed by selecting a region where noise is not disturbed at a destination, so that high-speed communication is performed. In case of the worst case or need for security, it will communicate using SS method.

In addition, this method enables communication without excessively generating a communication carrier more than necessary, thereby not affecting battery products such as home appliances and medical devices, and outputting in software according to the environment according to the above configuration. You can optimize by random adjustment.

As described above, the present invention detects the spread frequency on the line of the power line, finds a band free of noise, and enables high-speed communication using a narrow band, and if necessary, spreads to SS (Spread Spectrum). By converting to have complementary and stable effects, the frequency band is arbitrarily selectable, and the frequency is irradiated through the SS to actively avoid noise and increase the communication speed so that communication can be performed smoothly even in a line with a high impedance change and a noise. It is obvious that this is a very useful design that can improve the efficiency of the overall power line communication modem due to the possible effect and simultaneously achieve various effects such as maximizing reliability and satisfaction for the user who installs and uses the power line communication modem.

Claims (1)

In power line communication (PLC) for transmitting a communication signal superimposed on the line 11 of the power line for supplying power, An interface unit (10) for easily connecting a communication line such as RS-232 to easily transmit the data of a signal in order to facilitate the power line communication; After confirming the signal data output from the interface unit 10 generates or confirms and restores the BCH code, spreads and despreads, and generates a waveform of a sine wave, but ASK, FSK (MSK) and PSK (BPSK) or SS DSP unit 20 for generating and transmitting any type of waveform in accordance with the scheme; A carrier generator (30) for generating D / A conversion and a frequency according to the digital output signal of the DSP unit (20); A constant voltage amplifier 40 for amplifying the output waveform of the carrier generator 30 with respect to voltage and current and keeping the carrier constant against a change in impedance; A coupling circuit unit 50 for connecting or disconnecting and insulating and connecting the power line depending on whether to transmit the signal output from the constant voltage amplifier 40; A filter unit 60 for filtering a noise component of a frequency output when the coupling circuit unit 50 receives the signal, and selecting and filtering broadband or wideband data for each band; Differential detector 70 extracts the derivative value of the frequency passed through the filter unit 60 and transmits it to the integration and decode provided in the DSP unit 20 to enable easy frequency analysis and data detection by software. ; A power supply unit 80 for applying alternating current and direct current power so that the above components can be easily operated; Digital power line communication modem capable of multi-frequency and multi-mode characterized in that consisting of.