KR100471614B1 - Power line communication device for signal blocking and signal transfer function - Google Patents

Abstract

The present invention relates to a power line communication apparatus, comprising: first to third power lines and a neutral line to which three-phase power is transmitted; First to third blocking filters installed on the first to third power lines one by one to block a signal of a specific frequency band from passing through; First to third bypass filters installed one by one between the first to third power lines and the neutral line to bypass the signal of the specific frequency; And a signal combiner installed between the first to third power lines and the neutral line to transmit a signal input to the first power line to the second power line and the third power line. The line signal transmission characteristics are reduced.

Description

Power line communication device with signal blocking and signal transfer function

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to telecommunications technology, and more particularly, to a power line communication device having a signal blocking and signal transmission function that enables communication between home appliances and control of home appliances from the outside using a power line.

Power line communication (PLC) refers to a technology that transmits data on a high frequency signal of several hundreds [Hz] to several tens of [MHz] transmitted through a power line. Power line communication technology can be used to easily implement home networking, information appliances, and grid management. Since power line communication can be used to implement automation of home appliances, it is attracting attention as a next-generation communication technology from domestic and overseas communication companies and power companies.

1 is a block diagram of a conventional power line communication device. Referring to FIG. 1, the conventional power line communication device 101 includes first to third filter units 111 to 131. The first filter unit 111 blocks external noise from being transmitted to the inside, and the second filter unit 121 bypasses the noise input from the outside to prevent the external noise from being input into the inside. The three filter unit 131 blocks internal noise from being transmitted to the outside.

Such a conventional power line communication apparatus 101 has the following problems.

First, the cores of the inductors provided in the first and third filter units 111 to 131 are arranged in parallel as a straight line, whereby the magnetic flux generated in the inductors causes interference between the inductors, thereby lowering the frequency characteristic.

Second, since the number of inductors included in the first to third filter units 111 to 131 is large, the price of the power line communication device 101 is expensive.

Third, when the signal combiner is used, the rated voltage of the capacitors provided in the signal combiner is increased, and accordingly, the size of the capacitors is greatly increased, so that it is difficult to use them currently on the market and need to be manufactured separately. The price is very expensive.

It is an object of the present invention to provide a power line communication device which cuts a signal of a specific frequency band and has a signal transmission characteristic between lines.

Another technical problem to be achieved by the present invention is to provide a power line communication apparatus which is reduced in manufacturing cost and improved in stability and reliability.

Another object of the present invention is to provide a power line communication apparatus in which noise is reduced, signal transmission characteristics between lines are improved, and voltage resistances of capacitors are lowered.

The present invention to achieve the above technical problem,

First to third power lines and neutral lines to which three-phase power is transmitted; First to third blocking filters installed on the first to third power lines one by one to block a signal of a specific frequency band from passing through; First to third bypass filters installed one by one between the first to third power lines and the neutral line to bypass the signal of the specific frequency; And a signal coupler installed between the first to third power lines and the neutral line, the signal coupler configured to transfer a signal input to the first power line to the second power line and the third power line. To provide.

The present invention to achieve the above other technical problem

First to third power lines and neutral lines to which three-phase power is transmitted; First to third blocking filters installed on the first to third power lines one by one to block a signal of a specific frequency band from passing through; And first to third bypass filters installed one by one between the first to third power lines and the neutral line to bypass the signal of the specific frequency, and the first to third blocking filters respectively. First to third inductors; And first to third capacitors, wherein the first to third inductors each include first and second iron cores that are up and down while the first power line is wound; A third iron core interconnecting the first and second iron cores from above; And a fourth iron core disposed below the first iron core and the second iron core, the fourth iron core having a predetermined gap with the first and second iron cores.

Preferably, the first to third inductors are arranged laterally, a portion of the magnetic flux generated in the first to third inductors is emitted to the outside through the predetermined gap, so that the magnetic flux is saturated Is prevented.

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In order to achieve the above another technical problem, the present invention also,

First to third power lines and neutral lines to which three-phase power is transmitted; First to third capacitors connected to the first to third power lines one by one; And first to third inductors formed on one iron core, wherein the first to third inductors are connected between the first to third capacitors and the neutral line, respectively, of the first and third inductors. The winding direction is the same as each other, the winding direction of the first and third inductors and the winding direction of the second inductor has a transformer formed opposite, the signal input to the first power line by the transformer is the second And a power line communication device delivered to third power lines.

Preferably, the first to third capacitors each have a withstand voltage of 300 volts or less.

According to the present invention, the signal transmission between lines is improved.

In order to fully understand the present invention, the operational advantages of the present invention, and the objects achieved by the practice of the present invention, reference should be made to the accompanying drawings which illustrate preferred embodiments of the present invention and the contents described in the accompanying drawings.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Like reference numerals in the drawings denote like elements.

2 is a circuit diagram of a power line communication device according to the present invention. Referring to FIG. 2, the power line communication device 201 may include first to third blocking filters 211 to 213, first to third bypass filters 221 to 223, And a signal coupler 231.

The power line communication device 201 is installed in a building such as a home or an office. The power line communication device 101 enables signal transmission between electrical appliances in a home or office, blocks transmission of signals communicated with each other, and blocks external noise from being transmitted to the electrical appliances. .

The power lines 241 to 244 connected to the power line communication device 201 are configured in a three-phase four-wire system, that is, the first to third power lines 241 to 243 and the neutral line 244. The three-phase power having a commercial voltage, for example, a voltage of 110 volts or 220 volts is transmitted. Terminals to which the external power lines 241 to 243 are connected to the power line communication device 201 are called R, S, and T, respectively, and the power lines 241 to 243 connected to the electrical appliances inside the building Terminals connected to the power line communication device 201 are referred to as U, V, and W, and a neutral terminal to which the neutral line 244 is connected is referred to as N.

The first blocking filter 211 is connected between the terminals R and U and includes a capacitor C1 and an inductor L1. The second blocking filter 212 is connected between the terminals S and V and includes a capacitor C2 and an inductor L2. The third blocking filter 213 is connected between the terminals T and W and includes a capacitor C3 and an inductor L3. The first to third blocking filters 211 to 213 block a signal having a specific frequency band, for example, a frequency of 110 to 140 [KHz]. Therefore, signals of a specific frequency band inputted to the terminals R, S, and T through the power lines 241 to 244 are transmitted to the electrical appliances connected to the power line communication device 201. In contrast, the power line communication device Signals of a specific frequency band communicated between electrical appliances connected to 201 are blocked from passing through the powerline communication device 201 to the outside of the building.

The first bypass filter 221 is connected between the terminals R and N and includes a capacitor C4, an inductor L4, and a resistor R1. The second bypass filter 222 is connected between the terminals S and N and includes a capacitor C5, an inductor L5, and a resistor R2. The third bypass filter 223 is connected between the terminals T and N and includes a capacitor C6, an inductor L6, and a resistor R3. The first to third bypass filters 221 to 223 bypass a signal having a specific frequency band, for example, a frequency of 110 to 140 [KHz]. Accordingly, signals of a specific frequency band inputted to the terminals R, S, T, and N through the power lines 241 to 244 are transmitted to electrical appliances connected to the power line communication device 201. Signals of a specific frequency band communicated between electrical appliances connected to the communication device 201 are prevented from passing through the power line communication device 201 to the outside of the building.

The signal combiner 231 is installed between the terminals U, V, and W and the neutral terminal N, that is, between the first to third power lines 241 to 243 and the neutral line 244. The signal combiner 231 includes capacitors C7 to C9 and a transformer 233. The transformer 233 has inductors L7 to L9 connected between the capacitors C7 to C9 and the neutral terminal N. As such, the inductors L7 to L9 are connected between the terminals U, V, and W and the neutral terminal N, so that the signal combiner 231 receives the signals inputted to the terminals UN. , WN, transmit the signals input to the terminals VN to the terminals (UN, WN), and transmit the signals input to the terminals (WN) to the terminals (VN, UN) without noise. . In addition, since the inductors L7 to L9 are connected between the terminals U, V, and W and the terminal N, a commercial voltage is applied to the capacitors C7 to C9, respectively, and thus the capacitors C7 to L9. C9) is set to 300 volts or less (when 220 volts is used as a commercial voltage), respectively, and capacitors having a breakdown voltage of 275 volts that are currently manufactured can be used.

Therefore, when the capacitors C7 to C9 are installed inside the power line communication device 201, the interval between the capacitors C7 to C9 may be very short, and there is no risk that the capacitors C7 to C9 are damaged. . If the inductors L7 to L9 are not connected to the neutral terminal N and are connected only between the terminals U, V and W, when the voltage applied to the capacitors C7 to C9 is a commercial voltage (220 volts), Is applied, for example 380 volts, and the breakdown voltage of the capacitors C7 to C9 at this time should be higher than 380 volts. However, among the capacitors being manufactured, there are no internal pressures of 380 volts or more, so it is not only inconvenient to design and manufacture the capacitors, but even if a capacitor having an internal pressure of 380 volts or more is large in size, it takes up a lot of space. There is also a risk of explosion because the internal pressure is too high. The present invention solves all these problems.

3 illustrates a structure and an arrangement state of the first to third inductors provided in the first to third blocking filters illustrated in FIG. 2. Referring to FIG. 3, the first to third inductors L1 to L3 are laterally arranged side by side.

The first inductor L1 includes first to fourth iron cores 311 to 314. The first and second iron cores 311 and 312 are wound with a conductive wire such as enameled wire and are in a vertical state. The third iron core 313 is formed on the first and second iron cores 311 and 312, and interconnects the first and second iron cores 311 and 312. The fourth iron core 314 is provided below the first and second iron cores 311 and 312. Between the first and second iron cores 311 and 312 and the fourth iron core 314, there is a gap 321, for example, a gap of about 0.5 [mm]. Since the first to third iron cores 311 to 313 and the fourth iron core 314 are separated from each other, an insulator such as a plastic plate 323 is inserted into a predetermined gap 321 to fix them, and a third iron core ( The center portion 313 and the center portion of the fourth iron core 314 are bundled using a string. Preferably, the first to fourth iron cores 311 to 314 are made of a ferrite core.

As such, the first and second iron cores 311 and 312 may have a predetermined gap 321 formed between the fourth iron core 314 so that the magnetic flux 331 flowing inside the first to third iron cores 311 to 313. A portion of is emitted to the outside through the predetermined gap 321 (325), thereby preventing the magnetic flux 331 generated in the first inductor (L1) is saturated. Thus, the first inductor L1 has improved stability and reliability.

The second and third inductors L2 and L3 also have the same structure and effect as the first inductor L1.

Since the first to third inductors L1 to L3 are horizontally arranged side by side, even though each magnetic flux 331 is emitted to the outside through the predetermined gap 321, the first to third inductors L1 to L3 are mutually different. The magnetic flux in the orthogonal direction is generated and does not cause mutual interference.

FIG. 4 is a configuration diagram of the transformer shown in FIG. 2. Referring to FIG. 4, the transformer 233 wraps a conductive wire 441 such as an enamel wire in a quadrangular cylinder 411 formed of an insulator, and installs an iron core 431 such as a ferrite core inside and around the quadrangular cylinder 411. To configure. The quadrangular tube 411 can be configured in various shapes other than the quadrilateral. The conductive line 441 constitutes inductors (L7 to L9 in FIG. 2). That is, the conductive wire is wound around the surface of the square tube 411 to form an inductor L7. The inductor L7 is wound with a tape-like insulator on the inductor L7 and the other conductive wire is wound in the inverse direction with the inductor L7. The inductor L8 is formed, and another insulator is wound on the inductor L8, and another conductive wire is wound on the inductor L8 in the opposite direction to the inductor L8 and in the same direction as the inductor L7 to form the inductor L9. Inductors L7 to L9 are connected to terminals 421, respectively.

In this way, the inductors L7 to L9 are wound around one square tube 411, and the winding direction of the inductors L7 and L9 and the winding direction of the inductor L8 are reversed, and the ferrite core is shown in FIG. 4. As shown in the figure, the magnetic flux generated by the inductors L7 to L9 flows through the inside of the ferrite core. Therefore, the interference due to the electronic load is canceled between the inductors L7 and L9 and the inductor L8 to improve the signal transmission characteristic of the transformer 233.

In addition, the first power is connected by connecting the inductors L7 to L9 between the capacitors C7 to C9 of FIG. 2 and the neutral terminal N of FIG. 2 connected to the terminals U, V, and W of FIG. 2. Signals input to the power line communication device 201 through the line 241 of FIG. 2 are second and third power lines 242 and 243 of FIG. 2, and the power line communication device 201 through the second power line 242. ) Is a signal input to the first and third power lines (241, 243), the signal input to the power line communication device 201 through the third power line (243) is the first and second power lines (241, 242) It is transmitted without noise. Therefore, the line-to-line signal coupling characteristic is improved.

FIG. 5A is a graph showing line signal transmission characteristics and signal blocking characteristics of the power line communication device 201 shown in FIG. 2, and FIG. 5B is an enlarged frequency characteristic curve of 110 to 140 [KHz] shown in FIG. 5A. It is a graph.

5A and 5B, it can be seen that the line signal transmission characteristic curve 511 is constant at 110 to 140 [KHz], and the signal blocking characteristic curve 521 is almost zero.

That is, the magnitude of the signal transmitted between the power lines (241 to 244 in FIG. 2) at 110 to 140 [KHz] is constant, and the signals of 110 to 140 [KHz] are almost all generated by the power line communication device 201. Is blocked.

The best embodiments have been disclosed in the drawings and the specification. Although specific terms have been used herein, they are used only for the purpose of describing the present invention and are not intended to limit the scope of the invention as defined in the claims or the claims. Therefore, those skilled in the art will understand that various modifications and equivalent other embodiments are possible from this. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

As described above, the power line communication device 201 according to the present invention has the following advantages.

First, since the first to third blocking filters 211 to 213 and the first to third bypass filters 221 to 223 block the signals of the specific frequency band, the manufacturing cost is reduced.

Second, the magnetic flux 331 does not saturate due to the presence of predetermined gaps 321 in the iron cores provided in the first to third inductors L1 to L3, and thus the first to third inductors L1 to L3. ) Stability and reliability are improved.

Third, the signal combiner 231 facilitates signal transmission between the first to third power lines 241 to 244 connected to the terminals U, V, W, and N.

Fourth, the inductors L7 to L9 are connected between the terminals U, V, and W and the neutral terminal N, thereby improving signal transmission between lines and noise. In addition, the breakdown voltage of the capacitors C7 to C9 provided in the signal combiner 231 is lowered, and the risk of breakage of the capacitors C7 to C9 is reduced.

BRIEF DESCRIPTION OF THE DRAWINGS In order to better understand the drawings cited in the detailed description of the invention, a brief description of each drawing is provided.

1 is a block diagram of a conventional power line communication device.

2 is a circuit diagram of a power line communication device according to the present invention.

FIG. 3 illustrates a configuration and arrangement of inductors provided in the first to third blocking filters illustrated in FIG. 2.

FIG. 4 is a configuration diagram of the transformer shown in FIG. 2.

5A is a graph illustrating line signal transmission characteristics and signal blocking characteristics of the power line communication apparatus of FIG. 2.

FIG. 5B is an enlarged graph of the frequency characteristic curve of 110 to 140 [KHz] shown in FIG. 5A.

Claims (7)

First to third power lines and neutral lines to which three-phase power is transmitted; First to third blocking filters installed on the first to third power lines one by one to block a signal of a specific frequency band from passing through; First to third bypass filters installed one by one between the first to third power lines and the neutral line to bypass the signal of the specific frequency; And And a signal combiner disposed between the first to third power lines and the neutral line to transfer a signal input to the first power line to the second power line and the third power line. Powerline communication device. First to third power lines and neutral lines to which three-phase power is transmitted; First to third blocking filters installed on the first to third power lines one by one to block a signal of a specific frequency band from passing through; And First to third bypass filters disposed between the first to third power lines and the neutral line one by one to bypass the signal of the specific frequency; Each of the first to third blocking filters First to third inductors; And Having first to third capacitors, The first to third inductors, respectively First and second iron cores vertically and vertically positioned while the first power line is wound; A third iron core interconnecting the first and second iron cores from above; And And a fourth iron core provided below the first iron core and the second iron core and having a predetermined gap with the first and second iron cores. 3. The power line communication device of claim 2, wherein the first to third inductors are arranged laterally. The power line communication device of claim 2, wherein a part of the magnetic flux generated in the first to third inductors is emitted to the outside through the predetermined gap, thereby preventing the magnetic flux from being saturated. delete First to third power lines and neutral lines to which three-phase power is transmitted; And First to third capacitors connected to the first to third power lines one by one; And First to third inductors formed in one iron core, the first to third inductors are connected between the first to third capacitors and the neutral line, respectively, the winding of the first and third inductors The direction is the same as each other, the winding direction of the first and third inductors and the winding direction of the second inductor has a transformer formed opposite, And the signal input to the first power line by the transformer is transmitted to the second and third power lines. 7. The power line communication device of claim 6, wherein each of the first to third capacitors has a breakdown voltage of 300 volts or less.