KR100266342B1 - Bidirectional analog power line communication repeater - Google Patents

Abstract

The present invention relates to a two-way analog power line communication repeater that can reduce the manufacturing time of the system by reducing the delay time according to the signal conversion to improve the transmission speed of the power line communication line and its configuration is simple.

The bidirectional analog power line communication repeater is connected to the power line to pass the power signal as it is, but the signal separation filter for blocking the communication information signal, and respectively connected to both ends of the signal separation filter to filter the analog communication information signal input from the power line Band pass filters, analog switches for switching communication information signals filtered by the band pass filters, power line communication amplifiers for outputting a communication information signal inputted through the analog switches to a power line, and And a control logic unit for controlling the switching operation of the analog switches by determining the magnitude of the communication information signal filtered by the band pass filters.

Description

Bidirectional Analog Power Line Communication Repeater

The present invention relates to a bidirectional analog power line communication repeater, and in particular, by detecting and amplifying the analog communication signal transmitted in both directions through the power line and then retransmitted through the power line, bidirectional analog that can improve the transmission speed through the power line communication line It is about power line communication repeaters.

In general, a power line communication system refers to a system that communicates by using a power line installed in a customer, for example, a local area network using power line communication is used for home automation or factory automation. . However, since many loads such as a television or a computer are connected to a power line to which such a power line communication system is connected, it is difficult to transmit a communication information signal normally because various noises are emitted to the power line. In addition, signal attenuation occurs when the communication information signal is transmitted through a power line. Therefore, in order to improve this point, a repeater is usually installed in the power line.

1 is a block diagram showing a schematic configuration of a conventional bidirectional digital repeater.

Referring to FIG. 1, a conventional bidirectional digital repeater includes a first power line modem 71 for modulating or demodulating a communication information signal transmitted via a power line 70 in both directions, and one end of the first power line modem 71. A central processing unit 72 connected to the central processing unit 72 to control the relay function, and a communication information signal connected between the central processing unit 72 and the power line 70 and transmitted via the power line 70 in both directions; Is connected between the second power line modem 73 and the power line 70 to which the first and second power line modems 71 and 73 are connected, and does not communicate with the first and second power line modems 71 and 73. It consists of a signal separation filter 74 to block the transmission.

The second power line modem 73 demodulates the communication information signal modulated by the first power line modem 71 by the second power line modem 73 via the central processing unit 72, and the second power line modem (2). The signal modulated by 73 has a bidirectional signal processing operation in which the first power line modem 71 demodulates via the central processing unit 72.

The signal separation filter 74 may use an LC filter, and any filter capable of separating communication information signals between the first and second power line modems 71 and 73 may be used.

Looking at the operation of the conventional power line repeater as described above, when the user wants to communicate data with the other party using the power line 70, the user uses the equipment installed in each customer in the usual manner to transmit the communication information signal to the power line ( 70). The transmitted communication information signal is transmitted on the power line 70 and input to the repeater.

That is, when this communication information signal is inputted to the first power line modem 71 of the repeater of FIG. 1, the first power line modem 71 is a band set from the power line 70, for example, communication in the band of 10-450 [KHZ]. After filtering only the longitudinal signal, the filtered communication information signal is demodulated into a digital signal. At this time, if an error correction code is included in the communication information signal, error correction is performed to correctly restore the original information.

The restored communication information signal is input to the central processing unit 72, and accordingly, the central processing unit 72 inputs the input communication information signal to the second power line modem 73. The second power line modem 73 remodulates the demodulated call information signal, amplifies the analog sine wave signal, and transmits the same through the power line 70. The amplified communication signal includes a large current so that long distance transmission is possible.

On the other hand, when transmitting a communication signal from the customer connected to the power line 70 of the second power line modem 73, the transmitted communication signal is processed in the same manner as the communication signal input to the first power line modem 71 Only the direction is transmitted in reverse.

Here, the signal separation filter 74 installed between the first power line modem 71 and the second power line modem 73 has a communication information signal input and output to the first power line modem 71 and the second power line modem 73. It is blocked from being transmitted via the power line 70. However, this signal separation filter 74, for example, passes the power signal of 60 [HZ] as it is.

However, the conventional power line communication repeater has a disadvantage in that the transmission speed characteristics of power line communication are deteriorated because the propagation delay of the communication signal is generated because the power line modems 71 and 73 convert the communication signal into a digital signal. There is this. In addition, since at least two modems 71 and 73, which are very expensive equipments, must be used, the manufacturing cost of the communication relay system increases accordingly.

The present invention is to solve the above problems, by detecting and amplifying the analog communication signal transmitted in both directions through the power line and then retransmitted through the power line, reducing the delay time due to signal conversion, accordingly An object of the present invention is to provide a bidirectional analog power line communication repeater for improving a transmission speed through a communication line.

Still another object of the present invention is to provide a bidirectional analog power line communication repeater which can reduce the manufacturing cost of the system according to relaying the bidirectional communication signal by a simple circuit configuration.

In order to achieve the above object, the present invention is a bidirectional analog power line communication repeater having a signal separation filter which is connected to the power line to pass the power signal as it is, but blocks the communication information signal, each of the both ends of the signal separation filter Band pass filters connected to filter analog communication information signals input from a power line, analog switches for switching communication information signals filtered by the band pass filters, and communication information signals input through the analog switches. Provides a two-way analog power line communication repeater composed of power line communication amplifiers for outputting the power line to the power line, and a control logic unit for controlling the switching operation of the analog switches by determining the magnitude of the communication information signal filtered by the band pass filters. do.

1 is a block diagram illustrating a conventional power line communication system,

2 is a block diagram of a bidirectional analog power line communication repeater in accordance with the present invention.

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

1A, 1B: power line

2A, 2B: Bandpass Filter

3A, 3B: Analog Switch

4A, 4B: Power Line Communication Amplifier

5: control logic part

6: signal separation filter

7A, 7B: Square circuit

8A, 8B: Integrator

9A, 9B: Comparator

10: analog switch controller

2 is a block diagram of a bidirectional analog power line communication repeater according to the present invention.

The bidirectional analog power line communication repeater of the present invention is connected to the power line (1A, 1B) as shown in Figure 2 is a signal separation filter (6) for passing the power signal as it is but the transmission of the communication information signal, and the Band pass filters 2A and 2B for respectively filtering analog communication information signals from the power lines 1A and 1B connected to both ends of the signal separation filter 6 to a predetermined frequency band, for example, 10-450 [KHZ] bands. And the analog switches 3A and 3B for switching the communication information signal filtered by the band pass filters 2A and 2B, and the communication information signal input through the analog switches 3A and 3B. The power line communication amplifiers 4A and 4B output to the power lines 1A and 1B, and the magnitudes of the communication information signals filtered by the band pass filters 2A and 2B. By the control logic section 5 for controlling the switching operation of 3B). It is.

The control logic section 5 includes square circuit sections 7A and 7B for converting the communication information signal filtered by the band pass filters 2A and 2B into positive values, respectively, and the square circuit sections ( Integrators 8A and 8B that integrate the outputs of 7A and 7B to calculate an average value, respectively, and signals input from these integrators 8A and 8B are preset reference values. Comparators 9A and 9B for determining whether a communication signal is present through the band pass filters 2A and 2B compared to the reference voltage value Vref, and the determination signal output from the comparators 9A and 9B. In accordance with the configuration of the analog switch controller 10 for controlling the switching operation of the analog switches (3A, 3B).

In this case, the control logic unit 5 has an internal logic circuit designed such that the analog switches 3A and 3B do not operate at the same time, thereby causing malfunction of the analog switches 3A and 3B due to positive feedback. To prevent. In addition, the signal separation filter 6 may use an LC filter, or any filter capable of separating a communication signal between power lines 1A and 1B.

The operation of the bidirectional analog power line communication repeater of the present invention configured as described above will be described.

First, when the user wants data communication with the other customer using the power lines 1A and 1B, the user transmits the communication information signal to the power lines 1A and 1B using the equipment installed in each customer in the usual manner. The transmitted communication information signal is transmitted on the power lines 1A and 1B and then input to the band pass filters 2A and 2B.

That is, if the communication signal is transmitted through the power line 1A and is input to the band pass filter 2A, the band filter filter 2A is a band set among the signals input through the power line 1A. After filtering to pass only the communication information signal in the band 450 [KHZ], the filtered communication information signal is inputted into the square circuit unit 7A of the analog switch 3A and the control logic unit 5. At this time, the analog switch 3A does not operate because a control signal is not input from the analog switch controller 10.

The square circuit section 7A of the control logic section 5 converts the communication information signal input from the band pass filter 2A into a positive value. For example, since the communication information signals detected by the band pass filter 2A are detected as positive and negative sinusoidal signals, the values are squared and converted into positive values and then output to the integrator 8A. The integrator 8A integrates the signal input from the square circuit unit 7A, calculates an average value, and outputs the average value to the comparator 9A.

The comparator 9A compares the average value input from the integrator 8A with the reference value Vref and inputs the comparison result signal to the analog switch controller 10. At this time, if the communication information signal through the band pass filter 2A is detected, the comparator 9A applies the output signal to the analog switch controller 10, but if the communication information signal through the band pass filter 2A If not detected, the comparator 9A does not apply an output signal to the analog switch controller 10.

When the output signal of the comparator 9A is input to the analog switch controller 10, the analog switch controller 10 operates the analog switch 3A according to the output signal of the comparator 9A. Therefore, the communication information signal filtered by the band pass filter 2A is input to the power line communication amplifier 4A via the analog switch 3A, amplified, and then connected to the other end of the signal separation filter 6. It is sent to 1B. At this time, since the communication information signal transmitted through the power line 1B is amplified with a large current by the power line communication amplifier 4A, long distance transmission is possible.

Meanwhile, the communication information signal transmitted through the power line 1B is also processed in the same manner as the above process and is sent to the power line 1A connected to one end of the signal separation filter 6. At this time, the communication information signal filtered by the band pass filter 2B is signal-processed by the square circuit section 7B, the integrator 8B, the comparator 9B and the analog switch controller 10 in the control logic section 5. The analog switch 3B is controlled. As a result, the information communication signal through the analog switch 3B is amplified by the power line communication amplifier 4B and then sent to the power line 1A connected to one end of the signal separation filter 6.

In the above description, the repeater of the present invention is connected to the power line as an example, but it can be installed and used on any other communication line such as a telephone line or a TV cable.

As described above, the present invention detects and amplifies an analog communication signal transmitted in both directions through a power line, and then retransmits the signal through a power line, thereby reducing the delay time due to signal conversion, thereby reducing the transmission speed of the power line communication line. As well as improving, bi-directional communication relay is possible by simple circuit configuration, which reduces the manufacturing cost of the system.

Claims (2)

In the bidirectional analog power line communication repeater having a signal separation filter (6) connected on the power lines (1A, 1B) to pass the power signal as it is but block the communication information signal, Band pass filters 2A and 2B, which are connected to both ends of the signal separation filter 6 and respectively filter analog communication information signals input from power lines 1A and 1B, and the band pass filters 2A and 2B. Analog switches 3A and 3B for switching the communication information signal filtered by the power line, and power line communication amplifiers 4A and 4B for outputting the communication information signal inputted through the analog switches 3A and 3B to the power line. And a control logic unit 5 for controlling the switching operation of the analog switches 3A and 3B by determining the magnitude of the communication information signal filtered by the band pass filters 2A and 2B. A bidirectional analog power line communication repeater. 2. The control logic unit (5) according to claim 1, wherein the control logic unit (5) and the square circuit unit (7A, 7B) for converting the communication information signal filtered by the band pass filter (2A, 2B) to a positive value, respectively; The integrators 8A and 8B for integrating the outputs of the square circuit units 7A and 7B and calculating an average value, respectively, and the signals input from the integrators 8A and 8B are compared with a preset reference value for bandpass. The comparators 9A and 9B for determining whether a communication signal is present through the filters 2A and 2B and the determination signals outputted from the comparators 9A and 9B, respectively, are used for the analog switches 3A and 3B. Bidirectional analog power line communication repeater, characterized in that consisting of an analog switch controller 10 for controlling the switching operation.