KR20090091607A - Image security system using power line communication in subway - Google Patents

Abstract

An image security plc system of a subway using a power line is provided to arrange a PLC device in a subway, thereby configuring a PLC network of a subway. A blocking filter blocks noise inserted into a 220V power line network of a subway. One PLC master controls each PLC device connected to a PLC network. One or more PLC repeaters are positioned between the PLC devices. The PLC repeater extends a signal reach distance. A PLC modem is extended from the PLC repeater to connect to each subway. One or more PLC slaves assist an operation of the PLC master.

Description

Image security power line communication system of electric vehicle using power line {IMAGE SECURITY SYSTEM USING POWER LINE COMMUNICATION IN SUBWAY}

The present invention relates to a video security system using a power line in a carriage.

In order to record a video with a device such as a digital video recorder (DVR) by installing a video security camera in a guest room, a communication line connecting each passenger car as well as the inside of a passenger car must be configured. Since there is no suitable communication line between the carriage and the carriage, there is a problem in that an optical cable, an unshielded twisted pair (UTP) cable, or another communication cable must be newly established.

In other words, in order to construct an existing Ethernet-based electric vehicle communication system, not only problems related to cable installation, such as dismantling the interior structure and interior materials of a passenger car, securing wiring space for cable laying, problems of communication cable connection between passenger cars, and measures to prevent leakage of connection parts Since the wiring work process takes excessive time and cost, it can be implemented only when economic and construction problems are solved.

Meanwhile, power line communication is used for data and voice communication for buildings and homes, power distribution automation for electric power companies using outdoor power lines and indoor power lines, and the field of application of power line communication is expanding worldwide.

There are cases where the power line communication technology is applied to rail transportation such as electric cars and trains, but this is a power line communication system construction technology using a high voltage DC power line of thousands of volts. The 220 volt AC power required to drive the equipment must be connected separately, and the composition of the power line communication equipment and the signal coupling device has a disadvantage in that it is complicated.

In order to solve the shortcomings of the power line communication technology using the high voltage DC power line, in order to construct a power line communication system using the existing 220 volt low voltage AC power line of an electric vehicle or a train as a power line communication network, it is necessary to cut off the noise flowing into the power line of the electric vehicle and The key is to secure the data transfer rate.

The cause of the noise flowing into the power line is very diverse, for example, the noise by the power of the electronic power devices installed on the power line of the electric vehicle, the noise due to the opening and closing of the device, the noise generated by the device itself, etc. In some cases, noise may be introduced from adjacent power lines.

In addition, since the noise is generated in an irregular intensity and shape at an unspecified time over the entire frequency band of the power line communication equipment, rather than a specific frequency band, the noise is a major cause of greatly attenuating the data transmission speed of the power line communication equipment, thereby causing a low voltage AC power line of an electric vehicle. It is known to be the biggest obstacle of power line communication system implementation. Therefore, at present, there is no case that the two-way video security power line communication technology using the low-voltage power line of the electric vehicle is used, and it is difficult to apply it in practice.

The present invention has been proposed to solve the problems of the above-described prior art, utilizing the idle power line network of the 220 volt low-voltage power line already installed in the electric vehicle as the power line communication network, PLC master (Master), PLC repeater ( It is an object of the present invention to provide a video security power line communication system that can be constructed at low cost by arranging power line communication equipment such as a repeater) and a PLC modem in a cabin.

In addition, through the power line communication equipment such as PLC master, PLC repeater, PLC modem, etc., IP cameras are installed in each guest room, and each camera image is transferred to a digital video recording device (DVR) installed in an engine room to store camera image data. It aims to make management and management possible.

In addition, an object of the present invention is to provide a management system that can automatically determine the operating state of the power communication equipment through the SNMP (Simple Network Management Protocol) agent (Agent) to facilitate the operation management of the power line communication network.

In particular, the present invention applies a noise block filter to the power line network to block the noise flowing into the low-voltage power line of the train, and provides a technology for applying the noise block filter according to the configuration of the power line communication equipment in the passenger car power line using the low-voltage power line of the train It is an object of the present invention to provide an electric vehicle video security power line communication system that can be implemented at low cost by solving the noise problem that is the biggest obstacle of communication implementation.

In order to solve the above technical problem, the present invention provides a blocking filter for blocking the noise flowing into the 220 volt power line network of the electric vehicle; One PLC master to control each powerline communication equipment connected to the powerline communication network; At least one PLC repeater placed between power line communication equipment to extend signal reach; A PLC modem extending from the PLC repeater and connected to each vehicle; Provided is a power line communication system in an electric vehicle cabin using a power line including at least one PLC slave to assist the operation of the PLC master.

Preferably, an IP camera may be connected to the Ethernet ports of the PLC master, the PLC repeater, the PLC modem, and the PLC slave to capture an image of each vehicle.

More preferably, the camera may further include a DVR configured to receive and store an image captured by the IP camera through a power line communication network.

In addition, a blocking filter may be installed in each of the PLC master, the PLC repeater, the PLC modem, and the PLC slave to block noise flowing into the power line from the IP camera.

In addition, each of the PLC repeaters may be formed at a predetermined distance apart according to the system installation environment.

In addition, the PLC master may be located in the engine room or may be formed in the carriage to minimize the distance between the PLC repeaters.

According to the present invention, a power line communication network of an electric vehicle can be installed using an existing power line network without separately installing a communication cable.

In addition, if the system proposed in the present invention is constructed, the noise flowing on the power line can be cut off to secure a transmission speed necessary for transmitting a plurality of cabin image data.

In addition, since the existing power line is utilized, it is possible to reduce the investment cost and shorten the construction period of the communication network, and to easily operate and manage the communication network.

In addition, through a system that can monitor IP cameras and power line communication networks at the same time, it is possible to quickly identify and cope with problems in the event of a failure of a communication network or individual devices connected to the communication network.

1 is a diagram briefly showing a configuration of a power line communication network for a total of eight electric vehicles.

Referring to FIG. 1, for example, in case of eight trains, a PLC master is installed in a cabin No. 2, a PLC repeater and a PLC modem are installed at appropriate locations in each cabin, a PLC slave is installed in an engine room, and the PLC slave is installed. Install DVR. In addition, IP cameras are connected to each PLC master, PLC repeater, PLC modem, and PLC slave to configure a room video security system using a power line.

In addition, since the power line communication network connected by such a structure is very vulnerable to the influence of external noise, it is difficult to secure a sufficient video data transmission rate, so that a blocking filter as shown in FIG. 2 is installed according to the characteristics of each power line communication component. There is a need for a method to secure a transmission speed.

1 is a schematic diagram of a power line communication network of an electric vehicle.

2 is a blocking filter circuit diagram

3 is a structural diagram of each cabin vehicle.

4 is a block diagram of a blocking filter of a PLC master / PLC repeater / PLC slave

5 is a block diagram of a blocking filter of a PLC module

Claims (6)

Blocking filter for blocking the noise flowing into the 220 volt power line network of the electric vehicle; One PLC master to control each powerline communication equipment connected to the powerline communication network; At least one PLC repeater placed between power line communication equipment to extend signal reach; A PLC modem extending from the PLC repeater and connected to each vehicle; The power line communication system in the passenger compartment of the electric vehicle using a power line including at least one PLC slave to assist the operation of the PLC master. The method of claim 1, An electric power line communication system in a passenger compartment of an electric vehicle using an electric power line to which an IP camera is connected to the Ethernet ports of the PLC master, the PLC repeater, the PLC modem, and the PLC slave to take an image of each passenger car. The method of claim 2, The power line communication system in the passenger compartment of the electric vehicle using the power line further comprises a DVR for receiving and storing the image received by the IP camera through the power line communication network. The method of claim 1, Each PLC repeater is a two-way communication system in the electric vehicle cabin using power line communication is formed spaced apart a predetermined distance in accordance with the system installation environment. The method of claim 1, In order to block the noise flowing into the power line, the blocking filter is formed in the PLC master, the PLC repeater, the PLC modem and the PLC slave according to each configuration to secure the necessary transmission speed for transmitting a plurality of video data. Power line communication system. The method of claim 1, PLC Master, PLC Repeater PLC Modem, PLC Slave with SNMP Agent function that can automatically detect the operation status of power communication equipment through SNMP (Simple Network Management Protocol) for easy operation of power line communication network. Power line communication system.

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