KR20080040646A - Wideband blocking filtering system - Google Patents

Abstract

A wideband blocking filtering system is provided to supply a miniaturized blocking filter in high speed power line communication, thereby increasing stability and security by easily installing the blocking filter within a distributing board, a power outlet of a consumer terminal and a modem. Power lines(200,250) provide a path through which high power signals move. Plural sub networks(101~103) are physically connected to the power lines. A blocking filter(190) is installed in a sub network end, and blocks a flow of a communication signal transceived to each sub network through the power line. The sub network comprises a streetlight stabilizer for controlling currents flowing within a streetlight, and a distributing board(170) or a switch board or a power line modem having the blocking filter. The blocking filter filters the communication signal of a 2~30 MHz frequency band including at least one of a voice, text and image data.

Description

Broadband Blocking Filtering System

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a broadband blocking filtering system, and more particularly, to a broadband blocking filtering system that can control the flow of communication signals between sub-networks and can be installed in a switchboard of a home or an office.

High-speed power line communication (PLC) transmits and receives high-frequency signals of hundreds of KHz ~ tens of MHz using power lines already in most homes and offices. This high-speed power line communication is capable of high-speed Internet access and telephone connection to transmit voice, text and video data.

The biggest advantage of high-speed power line communication is that unlike other wired network methods, it is possible to establish high-speed internet connection and telephone connection even in places where no communication network is established by building a network with power lines already wired without additional wiring work.

The disadvantage of the high-speed power line communication is that a plurality of power line networks can be formed in the high-speed power line communication, so that one network and another network are physically connected. That is, A households, B households, and C households, which perform high-speed power line communication using power lines, form a network of the same protocol and are physically connected to one power line. When a communication signal including at least one of voice, text, and video data is introduced into the modem installed in the A furniture, the communication signal may be introduced into the B furniture or the C household through the power line. As a result, the communication signal introduced into the household A is inferior in security and stability, and distortion, transmission delay, and bandwidth attenuation of the communication signal occur.

In addition, since homes and offices that use high-speed power line communication using power lines are connected to street lamps and power lines installed nearby, electromagnetic waves emitted from street lamp lines and ballasts act as noise on communication signals flowing into homes or offices. Distortion and bandwidth attenuation occurs.

Blocking filter has been developed to solve these problems, but it takes up a considerable area to be installed in homes or offices, so even if it is installed in homes or offices, aesthetic or safety problems may occur, making it difficult for general consumers to purchase.

Therefore, there is a need for a blocking filter of a suitable size that can be applied to high-speed power line communication and installed in a switchboard of a home or office.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a miniaturized blocking filter in high-speed power line communication to easily install a blocking filter inside a switchboard, a power outlet at the end of a consumer, and a modem, The present invention provides a broadband blocking filtering system that can increase stability and security.

Another object of the present invention is to provide a broadband blocking filtering system having an inductor that can be used in a circuit having high thermal efficiency and high power flow in high-speed power line communication.

According to an aspect of the present invention, there is provided a broadband blocking filtering system including: a power line providing a path through which a high power signal travels; A plurality of sub-networks physically connected to the power line; And a blocking filter installed at an end of the sub network and blocking a flow of communication signals transmitted and received to and from each sub network through the power line.

Broadband blocking filtering system according to an embodiment of the present invention having the above configuration, by installing a blocking filter in the power outlet, switchboard in the high-speed power line communication, by controlling the flow of the communication signal in the physically connected network communication signal It can be provided with an inductor that can be used in a circuit having high thermal efficiency and high power flow in a place where high-speed power line communication is performed, and stability and security of the high-speed power line communication.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

1A is a diagram schematically illustrating a high speed power line communication system including a blocking filter according to an exemplary embodiment of the present invention.

Referring to FIG. 1A, the first subnetwork 101, the second subnetwork 102, and the third subnetwork 103 are physically connected to the first power line 200 because they are networks of the same protocol. The first to third sub-networks 101 to 103 include a blocking filter 190a at a side connected to the first power line 200 to control the flow of communication signals in the sub-networks 101 to 103. In addition, the first to third subnetworks 101 to 103 are connected to a dedicated line 300 provided by an Internet service provider (ISP).

In addition, the first to third sub-networks 101 to 103 may install a blocking filter 190a to solve a phenomenon in which the communication signal is distorted and bandwidth is attenuated by the ballast 105. In detail, the first to third sub networks 101 to 103 are connected to the street lamp 104 and the first power line 200 as illustrated in FIG. 1B. The electromagnetic waves generated from the ballast 105 installed in the street lamp 104 and the impedance of the street lamp line flow into the first to third sub-networks 101 to 103 through the first power line to cause distortion of the communication signal and bandwidth reduction. Therefore, the first to third sub-networks 101 to 103 may include a blocking filter 190a on one side to block the electromagnetic waves generated from the ballast 105 and the impedance caused by the street lamp line.

2 is a diagram schematically showing first to third sub-networks 101 to 103 in which a blocking filter according to an exemplary embodiment of the present invention is installed.

Referring to FIG. 2, the first to third sub networks 101 to 103 include a master device 130, a slave device 150, and a switchboard 170.

Here, the first to third sub-networks 101 to 103 according to the embodiment of the present invention are all the same configuration, so the second and third sub-networks 102 and 103 will not be described in detail.

The master device 130 is a device directly connected to a dedicated line 300 (not shown in FIG. 2) for receiving an XDSL signal provided by an ISP, and applies a communication signal to the slave device 150, and the first subnetwork 101. It is connected to the switchboard 170 provided in.

The slave device 150 is connected to the master device 130 through the second power line 250, and a communication signal transmitted to the master device 130 is applied, and the switchboard 170 disposed in the first subnetwork 101. Connected with The slave device 150 is preferably a communication device.

The switchboard 170 includes a fuse 180 and a blocking filter 190.

The fuse 180 is connected to the first power line 200 to one side and to the blocking filter 190a to the other side. The fuse 180 is an automotive circuit breaker for preventing an overcurrent from flowing through the second power line 250 installed in the first subnetwork 101.

The blocking filter 190 is connected to the fuse 180 on one side and to the master device 130 and the at least one slave device 150 on the other side. The blocking filter 190 has a communication signal including at least one of voice, text, and video data in the first subnetwork 101 through the first power line 200 and the second subnetwork 102 and the third subnetwork ( 103). In other words, when a communication signal introduced through the master device 130 is applied to at least one slave device 150 through the second power line 250, through the first power line 200 connected to the slave device 150. In addition to preventing the communication signal from flowing into the second sub-network 102 or the third sub-network 103, the communication signals in the second sub-network 102 and the third sub-network 103 are not limited to the first power line 200. ) To prevent the first subnetwork 101 from entering. The blocking filter 190a may include a printed circuit board on which first to fourth inductors L1 to L4, first and second capacitors C1 and C2, and first to third resistors R1 to R3 are disposed. It consists of the case which mounts a board | substrate. This blocking filter 190 will be described in detail with reference to FIG. 3.

3 is a circuit diagram of a blocking filter according to a first embodiment of the present invention.

Referring to FIG. 3, the blocking filter 190a may include a first AC line AC_1 and a second AC line AC_2. The first and second inductors L1 and L2 are arranged in series in the first AC line AC_1, and the first contact N1 is disposed between the output terminal of the first AC line AC_1 and the first inductor L1. The second contact point N2 is connected between the first inductor L1 and the second inductor L2. The third and fourth inductors L3 and L4 are disposed in series in the second AC line AC_2, and the third contact N3 is disposed between the output terminal of the second AC line AC_2 and the third inductor L3. The fourth contact point N4 is connected between the third inductor L3 and the fourth inductor L4. In addition, between the first contact point N1 and the third contact point N3, the first capacitor C1 and the first resistor R1 are connected in parallel, respectively, and the second contact point N2 and the fourth contact point N4 are connected. The second capacitor C2, the second resistor R2, and the third resistor R3 are respectively connected in parallel therebetween.

Here, since the blocking filter 190a circuit is a single phase circuit, either the first AC line AC_1 or the second AC line AC_2 becomes a power line and the other becomes a neutral line. In other words, when the first AC line AC_1 becomes a power line, the second AC line AC_2 becomes a neutral line, and the second AC line AC_2 acts as a virtual ground line GND_line, and the second AC line AC_2 When this power line is used, the first AC line AC_1 becomes a neutral line, and the first AC line AC_1 acts as a virtual ground line GND_line.

4A is a circuit diagram in which the second AC line AC_2 is a virtual ground line GND_line.

Referring to FIG. 4A, a circuit diagram in which a second AC line AC_2 is a virtual ground line GND_line includes first and second capacitors C1 and C2, first and second inductors L1 and L2, and first to second electrodes. It consists of three resistors R1-R3. The first capacitor C1 and the first inductor L1 are driven by the first low pass filter (LPF), and the second capacitor C2 and the second inductor L2 are driven by the second LPF. .

In detail, the first capacitor C1 constituting the first LPF passes a high frequency component and the first inductor L1 passes a low frequency component. By using the properties of the first capacitor C1 and the first inductor L1, communication is performed in the 2 to 30 MHz frequency band transmitted and received to the slave device 150 through the second power line 250 in the first subnetwork 101. You can cut off the signal. In general, when transmitting and receiving a communication signal including at least one of voice, text, and video data by using a power line, it is carried in the 2 to 30MHz frequency band.

That is, the communication signal of the 2 to 30MHz frequency band flowing from the output terminal OUT_1 of the first AC line AC_1 toward the input terminal IN is filtered through the first LPF and the second LPF. As such, the communication signal passing through the first LPF and the second LPF is not blocked because the frequency band component of 2 MHz or more on which the communication signal is loaded is not passed, and only the frequency band component of 2 MHz or less flows into the input terminal IN. A frequency band component of 2 MHz or less flowing into the input terminal IN does not affect the complementarity and stability of the communication signal even when flowing into the second and third sub-networks 102 and 103.

However, since the communication signal remaining to the first capacitor C1 and the second capacitor C2 prevents the communication signal passing through the first LPF and the second LPF from being filtered, the first resistor in parallel with the first capacitor C1. Arrange (R1) so that the communication signal remaining in the first capacitor (C1) flows through the first resistor (R1) to remove the communication signal remaining in the first capacitor (C1), and in parallel with the second capacitor (C2) The second resistor R2 and the third resistor R3 are disposed to allow a communication signal remaining in the second capacitor C2 to flow to the second resistor R2 and the third resistor R3 to form a second capacitor ( Remove the communication signal remaining in C2). Since the value of the first resistor R1 is preferably the same as the combined value of the second resistor R2 and the third resistor R3, if the values of the first resistor R1 and the second resistor R2 are equal to each other, The resistor R3 can be excluded from the blocking filter circuit.

4B is a circuit diagram when the first AC line AC_1 becomes the virtual ground line GND_line.

Here, the circuit diagram in which the first AC line AC_1 is the pseudo ground line GND_line may operate in the same manner as the circuit diagram in which the second AC line AC_2 is the virtual ground line GND_line. Accordingly, the first capacitor C1 and the third inductor L3 are driven with the first LPF, and the second capacitor C2 and the fourth inductor L4 are driven with the second LPF. Other components and operations are the same as the circuit diagram in which the second AC line AC_2 is the virtual ground line GND_line, and thus a detailed description thereof will be omitted.

5 is a perspective view illustrating an inductor provided in the broadband blocking filter according to the embodiment of the present invention.

Referring to FIG. 5, the first to fourth inductors L1 to L4 included in the blocking filter 190a are inductors wound by vortexing a coil on an outer circumferential surface of a cylindrical ferrite, and the inductor according to the number of coils wound on an outer circumferential surface of a ferrite. The value of L) is different. The inductor L may be used in a circuit in which high power flows. In particular, the inductor L may be applied to a circuit in which 50 amps flow, and thermal efficiency is improved compared to an inductor in which a coil is wound around a conventionally used annular magnet.

Blocking filter according to an embodiment of the present invention having such a configuration is larger than the normal cigarette pack, as shown in Figure 6 but has a significantly smaller size and weight than the conventional blocking filter is easy to carry. In detail, the blocking filter 190a is determined according to the size of the printed circuit board mounted in the case, and the size of the printed filter board is preferably 19 cm wide, 10 cm long, and 15 cm high. Therefore, the case of the blocking filter 190a is formed to be larger than the size of the printed circuit board so that the inductor, capacitor, and resistor disposed on the printed circuit board do not protrude to the outside when the printed circuit board is accommodated. It is preferably formed to have a height of 10cm, 15cm in height so as not to shake when the printed circuit board is accommodated. The blocking filter according to the embodiment of the present invention can be installed in a home or office because the blocking filter is compact and portable so that it can be installed even in a distribution board, distribution board or power line modem.

7 is a block diagram illustrating a blocking filter circuit according to a second embodiment of the present invention. FIG. 8 is a view showing a state in which the blocking filter circuit of FIG. 7 is actually applied. FIGS. 9A and 9B illustrate a second embodiment of the present invention. The figure which shows the external appearance of the blocking filter by FIG.

7 to 9B, the blocking filter 190b according to the second embodiment of the present invention is a connector which can be directly plugged into a household plug and used as an input terminal ACIN and an output terminal ACOUT of a blocking filter for serial connection. ) Is provided with a plug 300 for connecting with a home outlet (not shown) and an outlet 400 for connecting with a power line modem at an end. The blocking filter circuit for this purpose is a circuit for using a single phase power source to protect an internal circuit from an overcurrent that may be supplied through the AC power line to an AC power line branched from the plug 300. The fuse FUSE and the first inductor L1 are connected in series. In addition, the second inductor L2 is connected to the remaining one neutral line. In addition, an impedance matching circuit connected between the first and second inductors L1 and L2 and the outlet 400 in series with the capacitor C1 for the low pass filter LPF, the first resistor R1 and the third resistor ( 500 is connected in parallel to the AC line and the neutral line. The impedance matching circuit 500 is connected between the first node N1 and the second node N2 positioned between the first inductor L1 and the second inductor L2 and the outlet 400 to connect the outlet ( Match the impedance value that varies depending on the external device (power line modem, electronics, etc.) connected to 400. Meanwhile, an actual embodiment of the blocking filter 190b according to the second embodiment of the present invention is shown in FIGS. 8 to 9b. This blocking circuit 190b is provided with one power line as mentioned in the first embodiment. It blocks the frequency signal of 2 ~ 30MHZ band which flows out to the connected external sub network and blocks the noise generated from general electric and electronic products connected by power line and blocks the variable impedance change to provide stable power line environment.

FIG. 10 is a circuit diagram illustrating a blocking filter according to a third embodiment of the present invention, and FIG. 11 is a diagram illustrating an actual implementation of a blocking filter to which the circuit of FIG. 10 is applied.

10 and 11, the blocking filter 190c according to the third embodiment of the present invention is to solve the installation problem of the series blocking filter 190b according to the second embodiment. This can solve problems such as installation location or size problem that may occur, and installation in a condition where power is not cut off. In particular, for the installation of power line communication equipment such as power line modem and blocking filter, in order to prevent malfunction of equipment and inflow of distortion signal during network setting, it is usually necessary to cut off the power line before installing the equipment. The blocking filter 190c according to the third exemplary embodiment of the present invention can be installed without interrupting power, and can be miniaturized, and the installation of the blocking filter 190 can be further simplified by treating the contact unit 600 with a high-performance magnet. The blocking filter circuit described above uses single-phase power similarly to the series type. The blocking filter circuit has a first node (N1) and a second node (N2) formed on one line that forgets an AC line and a neutral line, and the first node N1 and the second node N2. It is composed of a low pass filter (LPF) connected in parallel to the AC power line (AC Line) and the neutral line (Netural Line) between the smoothing capacitor (C1), the first node and the second node connected between. The low pass filter LPF is an RC filter circuit and filters frequency signals in the 2 to 30 MHz band as described in the first and second embodiments. In addition, the smoothing capacitor C1 removes noise introduced from the outside. Meanwhile, an impedance matching circuit 500 for matching an external impedance may be added similarly to the series blocking filter 190b described in the second embodiment.

12A and 12B illustrate various forms of communication signals input to a sub network according to an embodiment of the present invention.

12A and 12B, the first through third sub-networks 101 through 103 may be interrogated by voice, text, and video data due to interference by the street light 104 and the ballast 105, as shown in FIG. 12A. It can be seen that noise is generated in the communication signal of the 2 to 30 MHz frequency band including at least one and the bandwidth of the communication signal is attenuated. In order to eliminate the interference caused by the street lamp line and the ballast, the blocking filters 190a are installed in the first to third sub networks 101 to 103, so that the first to third sub networks 101 to 3 are shown in FIG. 7B. 103 may confirm that distortion and bandwidth attenuation of a communication signal input to the first to third sub-networks 101 to 103 are prevented.

Blocking filter according to an embodiment of the present invention having such a configuration can not only improve the reliability of the security and stability of the communication signal in the home or office, but also eliminate the noise generation and bandwidth attenuation caused by the street lamp line and ballast. .

Although the technical spirit of the present invention has been described in detail according to the above-described preferred embodiment, it should be noted that the above-described embodiment is for the purpose of description and not of limitation. In addition, those skilled in the art will understand that various embodiments are possible within the scope of the technical idea of the present invention.

1A and 1B schematically illustrate a high speed power line communication system having a blocking filter according to a first embodiment of the present invention.

FIG. 2 is an exemplary diagram schematically showing a subnetwork shown in FIG. 1. FIG.

FIG. 3 is a blocking filter circuit diagram shown in FIG. 2. FIG.

4A and 4C are circuit diagrams showing that the blocking filter circuit shown in FIG. 3 is variously driven.

FIG. 5 is a schematic view of an inductor disposed in the blocking filter circuit diagram shown in FIG. 3. FIG.

6 is an exemplary view schematically showing an actual size of a blocking filter according to a first embodiment of the present invention.

7 is a blocking filter circuit diagram according to a second embodiment of the present invention.

8 is a view showing a state in which a blocking filter circuit according to a second embodiment of the present invention is actually applied.

9A and 9B are views showing the appearance of a blocking filter according to a second embodiment of the present invention.

10 is a circuit diagram of a blocking filter according to a third embodiment of the present invention.

FIG. 11 is a diagram illustrating an actual implementation of a blocking filter to which the circuit of FIG. 10 is applied.

12a and 12b is a view showing the effect of the breaking filter in accordance with an embodiment of the present invention.

Claims (3)

A power line providing a path through which a high power signal travels; A plurality of sub-networks physically connected to the power line; And And a blocking filter installed at the end of the sub network and blocking a flow of communication signals transmitted and received to and from each sub network through the power line. The method of claim 1, wherein the sub-network, A street light ballast for controlling a current flowing in the street light; And And a distribution board, a distribution board, or a power line modem including the blocking filter. The method of claim 1, wherein the blocking filter, Broadband blocking filtering system characterized in that for filtering communication signals in the 2 to 30 MHz frequency band containing at least one of audio, text and video data.

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