KR102590085B1 - Power line comunication(plc) disaster broadcasting device and method with improved phase loss - Google Patents

Abstract

The present invention relates to a PLC disaster broadcasting device and method that improves phase loss in order to prevent data loss occurring during data transmission and reception through a power grid. A transmitter transmitting data to the device, a database storing offset data for phase changes based on the reference synchronization signal, and generating phase-compensated disaster broadcasting data based on the offset data of each device stored in the database. and a signal processing unit, wherein the magnetic device includes a receiving unit that receives the reference synchronization signal, and a measurement unit that compares the reference phase value of the magnetic device with the reference synchronization signal and measures offset data for the changed phase.

Description

PLC disaster broadcasting device and method with improved phase loss {POWER LINE COMUNICATION (PLC) DISASTER BROADCASTING DEVICE AND METHOD WITH IMPROVED PHASE LOSS}

The present invention relates to a PLC disaster broadcasting device and method that improves phase loss to prevent data loss that occurs during data transmission and reception through a power grid.

Today's broadcasting and communication environment requires reliable transmission of high-speed, large-capacity multimedia data anytime, anywhere.

In particular, the underground spaces where people live include road tunnels, subway tunnels, mine tunnels, underpasses, underground shopping malls, building basements, and ships. As the time spent living in underground spaces increases, quality communication and broadcasting services are provided. The need to provide this is increasing.

Power Line Communication (PLC) is a technology that communicates voice data as a signal through a power line that supplies power.

Power line communication is the most extensive network configuration among existing infrastructures, and has the advantage of enabling stable supply through the characteristics of a power grid that allows for smooth maintenance and repair. The network can be easily configured through electrical outlets installed in all spaces, and a separate communication network is available. By utilizing existing electric lines without the need to build new installation costs, it is possible to save new installation costs and has the effect of providing data services to blind spots in the network.

Additionally, in the case of power line communication, data communication is easy where power is supplied, but if power is not supplied, data communication does not occur. However, monitoring is possible in situations where power is not supplied, which has the effect of facilitating activation response.

Power line communication has various advantages, but not only is the network configuration complex and multi-layered, it must overcome special environments such as load, interference, noise, variable impedance, and signal attenuation, and transmit data through limited transmission power. Difficulties follow. Noise generated through power lines includes asynchronously generated noise such as electric motors, high-frequency noise (harmonic noise) generated at a frequency of integer multiples of 60 Hz, and independent impulse noise generated when connecting or disconnecting switches of electronic devices. etc. exist.

As such, due to the noisy nature of the line, it is unsuitable for use as a high-speed communication network. Due to the rapid development of communication technologies such as noise removal technology, many existing problems are being solved one by one.

Nevertheless, as shown in Figure 1, above-ground sections, buried sections, and overlapping sections with other lines may be mixed, and these may be caused by the environment of the line, cable interference depending on the length of the cable, and the amount of power of the device used. Variables in data loss arise due to various installation environments, such as loss.

Figure 2 shows that the phase changes depending on the installation space of the power line and the adjacent interference environment. Figure 2a shows the phase change and loss occurring due to buried sections or adjacent lines, and Figure 2b shows that another line is connected in the middle of the power line. This shows that phase changes and losses occur, and Figure 2c shows that phase changes and losses occur when there is another line in the middle of the power line, but the cord is not connected.

Conventionally, compensation was made with an arbitrary value to compensate for phase loss by adding a phase converter in the middle, referring only to the phase change of the transmission line according to the cable length. However, as various factors other than the length of the cable have occurred that change the phase, all factors have changed. It was difficult to respond, so it was not possible to compensate for the loss of the optimized phase change.

Accordingly, there is a problem that power load or phase changes caused by various factors on the PLC power line lead to data loss.

Korean Patent Publication No. 2014-0130087

The present invention provides a PLC disaster broadcasting device with improved phase loss that minimizes data loss and ensures stable disaster broadcasting by delivering signals optimized for each device with different loss rates depending on the path status and environmental changes of the PLC. It provides a method.

In addition, the present invention provides a PLC disaster broadcasting device and method with improved phase loss that reduces the data loss rate that varies depending on the amount of power used by the device.

The technical problems to be achieved by the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the description below. You will be able to.

The PLC disaster broadcasting device with improved phase loss of the present invention to achieve the above problem is a PLC disaster broadcasting device that includes a plurality of magnetic devices containing reference synchronization signals connected to the main device and a power line, wherein the main device is each self-device. A transmitter that transmits a reference synchronization signal containing a reference phase value to the device, a database that stores offset data for phase changes based on the reference synchronization signal, and an offset of each device stored in the database. It includes a signal processing unit that generates phase-compensated disaster broadcasting data based on the data, and the self-device includes a receiver that receives the reference synchronization signal, and a reference phase value of the self-device and the changed phase by comparing the reference synchronization signal. It includes a measurement unit that measures offset data for the magnetic device, wherein the magnetic device transmits the detected offset data to the main device, and the transmitter carries phase-compensated disaster broadcast data generated by the signal processing unit and transmits it to the magnetic device. The device is characterized in that it outputs the received disaster broadcast data to an auxiliary unit and transmits the disaster broadcast.

In addition, the offset data may further include power offset data according to the power line load of the magnetic device.

In addition, the field of the database is characterized by including the ID, type, IP address, MAC address, power offset data measured by the device, and phase offset data.

Another PLC disaster broadcasting method with improved phase loss according to the present invention to achieve the above problem is that when a self-device channel analysis request event occurs in the main device, the transmitter of the main device sends a reference synchronization signal containing the reference phase value. transmitting to the receiving unit of each magnetic device; The self-device detects offset data for a phase change by comparing it with a received reference synchronization signal and transmits it to the host device; The main device stores the received offset data in a database (DB) to determine the status of each device; When a disaster broadcast request occurs, the host device compensates the phase based on offset data of each device previously stored in the database, generates disaster broadcast data with the compensated phase, and transmits it to the device; The self-device is characterized in that it includes a step of transmitting a disaster broadcast using the received disaster broadcast data.

Subsequently, the offset data further includes power offset data according to the power line load of the magnetic device.

In addition, the field of the database is characterized by including the ID, type, IP address, MAC address, power offset data measured by the device, and phase offset data.

In addition, the analysis request event is characterized as one of the following: POWER ON of the main device, a predetermined period, an analysis instruction received from a remote server, whether a communication error has occurred in the self-device, and an alarm according to a preset condition.

As explained above,

The present invention can improve data loss due to phase change and has the effect of coping with phase loss due to various environmental factors, which has the effect of implementing stable disaster broadcasting in emergency situations through stable disaster broadcasting data transmission. there is.

In addition, the present invention has the effect of transmitting disaster broadcasting from any location by delivering stable disaster broadcasting data to devices regardless of whether a new power line is added in addition to the initially installed power line or environmental factors depending on the installation location. .

Additionally, the present invention has the effect of reducing the data loss rate depending on the amount of power used in the device.

Figure 1 is a configuration diagram of a PLC connection with mixed overlapping sections.
Figure 2 is a diagram showing the phase change depending on the installation space of the power line and the adjacent interference environment.
Figure 3 is a block diagram showing a PLC emergency broadcasting device with improved phase loss according to an embodiment of the present invention.
Figure 4 is a flowchart showing the magnetic device analysis method among the PLC disaster broadcasting methods with improved phase loss according to an embodiment of the present invention.
Figure 5 is a flowchart showing a PLC disaster broadcasting method with improved phase loss according to an embodiment of the present invention.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the attached drawings.

In addition, the size or shape of the components shown in the drawings may be exaggerated for clarity and convenience of explanation, and terms specifically defined in consideration of the configuration and operation of the present invention may vary depending on the intention or custom of the user or operator. and definitions of these terms should be made based on the content throughout this specification.

Figure 3 is a block diagram showing a PLC emergency broadcasting device with improved phase loss according to an embodiment of the present invention. The PLC emergency broadcasting device consists of a main device 100 and a magnetic device 200. The main device collects external signals and transmits them to the device, allowing broadcasting to be transmitted depending on the situation.

In other words, in the event of a non-disaster, the broadcasting signal received on the ground is relayed and amplified with the same configuration as the relay amplification device, and the amplified signal is transmitted through RF broadcasting through leaky cables or antennas in the underground shaded area, and then through radio and DMB. When a disaster occurs, RF broadcasting stops and switches to disaster broadcasting.

Accordingly, since the embodiment of the present invention corresponds to a technology for disaster broadcasting using PLC, a detailed description of the RF broadcasting-related configuration required in case of non-disaster will be omitted.

In an embodiment of the present invention, the main device 100 of the PLC disaster broadcasting device with improved phase loss is composed of a transmitter 110, a database 120, and a signal processor 130, and the magnetic device 200 includes a receiver 210. ), a measuring unit 220, and an auxiliary unit 230.

Here, it is preferable that the main device 100 and the magnetic device 200 each have a central processing unit (not shown) to control and process each component.

Additionally, it is desirable that the host device 100 and the magnetic device 200 be synchronized to smoothly transmit and receive data.

The transmitter 110 of the host device 100 transmits a reference synchronization signal including a reference phase value to each magnetic device 200 that contains the reference synchronization signal.

At this time, the transmitter 110 was called the transmitter 110 due to its main function of transmitting a reference synchronization signal to the magnetic device 200. However, since it can later receive data from the magnetic device 200, transmission and reception are more preferable. This is a possible configuration.

The database 120 stores offset data for phase changes based on the reference synchronization signal or updates and stores the changed offset data.

At this time, the offset data corresponds to information received from the magnetic device 200, and will be described again with reference to the magnetic device 200 below.

In addition, the field (fild) of the database 120 includes the ID, type, IP address, MAC address of the magnetic device 200, power offset data measured by the magnetic device 200, and phase offset data. The ID of (200) refers to the unique identification number of the spaced magnetic devices 200, and the type is an item to distinguish whether the corresponding magnetic device 200 is an end-type or a connected type.

The IP address and MAC address refer to the unique properties of the magnetic device 200, the power offset data measured in the magnetic device 200 is data about the power line load of the magnetic device 200, and the phase offset data is This refers to data on the phase change of the difference from the reference synchronization signal received as a standard for the magnetic device 200.

In addition, the database 120 may further include the date on which the analysis of the magnetic devices 200 was performed, the cycle at which the analysis will be performed, etc.

Additionally, the database 120 further stores coordinate information or detailed location information about the location of the magnetic device 200.

In the case of a single-story building, the location can be determined only through coordinate information, but in the case of a high-rise building, the location cannot be determined through coordinate information, so it is desirable to store detailed location information such as the number of floors for the location.

This means that when the host device 100 receives the disaster occurrence information detected by the self-device 200, the location information of the self-device 200 that detected the disaster is transmitted to the server 300 to determine whether a disaster has occurred or not. This is to inform the public and enable disaster broadcasts to be made promptly.

The signal processing unit 130 compensates the transmission signal based on the offset data of each magnetic device 200 stored in the database 120, and compensates for the signal by shifting the phase by the offset phase. Accordingly, the phase of the disaster broadcasting data arriving at each device 200 can be matched.

In other words, before transmitting a disaster broadcast, the host device 100 frequently analyzes the optimal state in which the self-devices 200 performing the disaster broadcast can receive the disaster broadcast in order to ensure smooth data transmission.

The magnetic device 200 consists of a receiving unit 210, a measuring unit 220, and an auxiliary unit 230.

The receiving unit 210 contains a reference synchronization signal and receives a reference synchronization signal including a reference phase value from the host device 100.

At this time, the receiving unit 210 is called the receiving unit 210 due to its main function of receiving a reference synchronization signal from the main device. However, since it can later transmit offset data to the main device 100, it is more preferably configured to transmit and receive.

The measurement unit 220 compares the reference phase value of the magnetic device with the phase included in the reference synchronization signal and measures offset data for the changed phase.

That is, the magnetic device 200 initially contains the reference synchronization signal and phase by default, and measures the difference from the reference synchronization signal received from the host device 100.

To measure offset data in the measuring unit 220, first, in order to convert an analog signal into a digital signal, a signal acquired at regular intervals converted to digital by an AD converter can be sampled and measured.

At this time, phase measurement techniques include modified zero crossing technique, level crossing technique, and least squares technique, but the measurement technique is not limited to any one technique.

Here, the offset data may further include power offset data according to the power line load of the magnetic device 200.

In other words, power offset data is data for determining the optimal amount of power provided to each magnetic device 200 as each magnetic device 200 produces different amounts of power depending on its state.

At this time, the optimal amount of power can be obtained by adjusting the amount of power applied to the device step by step.

The measurement unit 220 compares the phase value of the magnetic device based on the reference synchronization signal received from the main device 100 and measures offset data for the changed phase.

The auxiliary unit 230 transmits a disaster broadcast using the received disaster broadcast data. Disaster broadcasting can be any one of disaster broadcasting in the form of a special warning, disaster risk information voice message, or disaster warning voice signal data.

The magnetic device 200 may further include a disaster detection unit (not shown).

Disasters may occur for various reasons, but in the event of a physical disaster such as a fire, the occurrence of a disaster is detected through the magnetic device 200 installed in various locations away from the main unit 200, and conversely, the disaster occurs in the main unit 100. By transmitting occurrence information, it is possible to easily determine the location of a disaster and whether a disaster has occurred, thereby enabling disaster broadcasting to be implemented by quickly transmitting a disaster broadcasting signal to self-devices 200 located in other locations.

Figure 4 is a flowchart showing the magnetic device analysis method among the PLC disaster broadcasting methods with improved phase loss according to an embodiment of the present invention.

When an analysis request event for the channel of the magnetic device 200 occurs in the host device 100, the host device 100 transmits a reference synchronization signal including a reference phase value through the transmitter 110 to each magnetic device 200. It is transmitted to (S110).

At this time, the host device 100 can transmit the reference synchronization signal to all previously registered self-devices or only to the self-device where an error has occurred.

Here, the analysis request event is any of the following: POWER ON of the main device 100, a predetermined period, analysis instructions received from the remote server 300, whether a communication error has occurred in the self-device 200, and an alarm according to preset conditions. It could be one.

Analysis request events can be made when a disaster occurs, but it is desirable to make them frequently before a disaster occurs in order to quickly broadcast disasters.

Next, each self-device 200 contains a reference synchronization signal, and offset data for the phase change is detected through comparison with the received reference synchronization signal of the host device 100 (S120).

Here, the offset data is obtained by measuring the power line load on the magnetic device 200 (S121) and comparing the power offset data for the power line load with the reference phase and reference synchronization signal of the magnetic device 200 (S122). Contains phase data.

Next, each magnetic device 200 transmits the detected offset data to the main device 100 (S130). At this time, the host device 100 can receive offset data from all previously registered magnetic devices 200 or only from the magnetic device 200 where an error occurred, but the host device 100 can only receive offset data from the magnetic device 200 that transmitted the reference synchronization signal. In (200), it is desirable to receive all offset data.

Finally, the main device 100 stores the received offset data as parameters corresponding to each field of the database (DB) (S140) and ends the channel analysis event of the self-device 200 (S150).

The channel analysis event of the magnetic device 200 can be performed frequently even in non-disaster times, so that disaster broadcasting data with improved phase loss can be transmitted in an optimal state when a disaster occurs.

Here, disaster broadcasting includes disaster details and response plans received from the server 300 in real time.

Figure 5 is a flowchart showing a PLC disaster broadcasting method with improved phase loss according to an embodiment of the present invention.

After analyzing the magnetic devices as shown in Figure 4, if no disaster occurs, the system switches to standby mode.

In the case of disaster broadcast standby mode, it refers to a state in which radio, DMB, etc. are being transmitted in the RF broadcast state, and when a disaster occurs, the server 300 is switched to start disaster broadcasting through the PLC.

That is, when a disaster broadcasting request is received from the server 300 to the host device 100 while in standby mode, the host device 100 loads the offset data of each device 200 stored in the database 120 (S210). ).

At this time, it is obvious that the main device 100 can communicate with the server 300 through a central processing unit (not shown).

Next, the power and phase corresponding to each magnetic device 200 are compensated based on the offset data loaded from the database 120 (S220). At this time, the power and phase can be compensated by shifting by the offset data.

More specifically, in the process of transmitting the waveform along the cable, a delay occurs in which the frequency is slowed down, and the phase received by the magnetic device 200 is distorted, resulting in a change in the phase received by the magnetic device 200 from the main device 100. Shift the phase by the correct phase angle.

Here, the reason why the same phase is not shifted all at once is because the angle of the phase shift received by each magnetic device 200 is different, and when the phase is shifted all at once, the wrong phase is further shifted, so each magnetic device 200 It is desirable to compensate the phase individually according to the phase according to (200).

Next, disaster broadcasting data is generated in the compensated phase (S230), and the disaster broadcasting data is transmitted in the compensated phase for each device 200 (S240).

At this time, the disaster broadcast data is in the form of real-time voice data and may be any one of disaster broadcasts in the form of special alerts, disaster risk information voice messages, and disaster warning voice signal data.

Finally, each device 200 determines whether there is an error in the received disaster broadcast data (S250) and, if no error occurs, transmits the disaster broadcast (S251).

Here, the self-devices 200 can check whether there is an error using the check code included in the disaster broadcasting data transmitted from the main device 100.

If an error in the disaster broadcasting data is confirmed, there is a possibility of data loss, so channel analysis is requested to the host device 100 (S252)

Therefore, the present invention can reduce data loss due to phase change and is effective in coping with phase loss due to various environmental factors, enabling stable disaster broadcasting in emergency situations through stable disaster broadcasting data transmission. It works.

In addition, the present invention has the effect of enabling disaster broadcasting to be performed at any location by delivering stable disaster broadcasting data to devices regardless of whether new power lines are added in addition to the initially installed power line or environmental factors depending on the installation location. .

Additionally, the present invention has the effect of reducing the data loss rate depending on the amount of power used in the device.

Although embodiments according to the present invention have been described above, they are merely illustrative, and those skilled in the art will understand that various modifications and equivalent scope of embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention should be determined by the following patent claims.

100...main device
110...Transmitting unit
120...database
130...Signal processing unit
200...magnetic device
210...receiving unit
220...measuring part
230...Auxiliary Department

Claims (6)

In the PLC disaster broadcasting device including a plurality of magnetic devices containing a reference synchronization signal connected to the main device and a power line,
The host device includes a transmitter that transmits a reference synchronization signal containing a reference phase value to each magnetic device, a database that stores offset data for phase changes based on the reference synchronization signal, and a device stored in the database. It includes a signal processing unit that generates phase-compensated disaster broadcasting data based on the offset data of each device,
The self-device includes a receiving unit that receives the reference synchronization signal, and a measurement unit that measures offset data for the changed phase by comparing the reference phase value of the self-device with the reference synchronization signal,
The self-device transmits the detected offset data to the main device, the transmitter loads the phase-compensated disaster broadcasting data generated by the signal processing unit and transmits it to the self-device, and the self-device outputs the received disaster broadcast data to the auxiliary unit. A PLC disaster broadcasting device with improved phase loss that transmits disaster broadcasts.
In claim 1,
A PLC disaster broadcasting device with improved phase loss, wherein the offset data further includes power offset data according to the power line load of the magnetic device.
In claim 1,
The fields of the database include the ID, type, IP address, MAC address of the device, power offset data measured in the device, and phase offset data. A PLC disaster broadcasting device with improved phase loss. .
In the PLC disaster broadcasting method using a plurality of magnetic devices containing a reference synchronization signal connected to the main device and a power line,
When a magnetic device channel analysis request event occurs in the host device, transmitting a reference synchronization signal including a reference phase value from a transmitter of the host device to a receiver of each magnetic device;
The self-device detects offset data for a phase change by comparing it with a received reference synchronization signal and transmits it to the host device;
The main device stores the received offset data in a database (DB) to determine the status of each device;
When a disaster broadcast request occurs, the host device compensates the phase based on offset data of each device previously stored in the database, generates disaster broadcast data with the compensated phase, and transmits it to the device;
A PLC disaster broadcasting method with improved phase loss, comprising: transmitting, by the self-device, a disaster broadcast using the received disaster broadcast data.
In claim 4,
The offset data further includes power offset data according to the power line load of the magnetic device. A PLC disaster broadcasting method with improved phase loss.
In claim 4,
The fields of the database include the ID, type, IP address, MAC address, power offset data measured by the device, and phase offset data,
The analysis request event is one of the following: POWER ON of the main device, a predetermined period, analysis instructions received from a remote server, whether a communication error occurs in the device, and an alarm according to preset conditions. Improved PLC disaster broadcasting method.