KR20050037838A - Power line communication repeater using frequency conversion - Google Patents

Abstract

The present invention relates to a power line communication repeater using frequency conversion,

The present invention is connected to a power line and amplified a signal of the first frequency band through the power line and then converted to a signal of the second frequency band to provide a power line again, and after amplifying the signal of the second frequency band through the power line Converted into a signal of the first frequency band and provided to the power line again,

According to the present invention, by simply implementing a hardware repeat function to a plurality of communication nodes to communicate, stable communication is possible by repeat operation to adjacent nodes even in a poor communication channel, and also simple and inexpensive. There is an effect that can be implemented.

Description

Power line communication repeater using frequency conversion {POWER LINE COMMUNICATION REPEATER USING FREQUENCY CONVERSION}

The present invention relates to a power line communication repeater using frequency conversion. In particular, by simply implementing a hardware repeat function on a plurality of communication nodes to communicate, stable communication can be achieved by repeat operation to adjacent nodes even in a poor communication channel. The present invention relates to a power line communication repeater using frequency conversion that can be implemented easily and inexpensively.

In general, a variety of communication systems are emerging due to the development of digital communication technology, and communication systems are classified into wired communication and wireless communication, but power line communication can be regarded as a mixed form of wired and wireless. . Because wired communication is required but new wiring is unnecessary. That is the same effect as wireless communication. In the past, there have been analog-type low-speed power line communication for control and voice communication, but recently, with the advent of high-speed communication networks using ADSL and cable modems due to the spread of the Internet, and many related products, such as home appliances, have been digitized, In a situation where the necessity becomes more important, the communication system technology of the digital communication method capable of high-speed communication is also rapidly developing.

The communication system using the repeater function applied to the conventional power line communication means, as disclosed in Korean Patent Laid-Open Publication No. 2003-0037887, a control center, a data collection device 6 installed in Jeonju, and a low voltage distribution line drawn out from Jeonju. In the case of being composed of a plurality of control devices connected directly to (8) and installed outside the indoors, the data collection device is made as shown in FIG.

1 is a block diagram of a conventional data acquisition apparatus having a repeater function.

Referring to FIG. 1, a data collecting device 6 having a repeater function in the related art includes an external communication device 20, an external device interface unit 22, a memory 24, a CPU 26, a signal processing unit 28, Digital-to-analog converter 30, output filter 32, drive circuit 34, coupling unit 36, analog switch 38, amplifier 40, input filter 42, analog-to-digital converter ( 44).

The implementation of the repeater function in such a conventional communication system includes a plurality of configurations including a central processing unit and a signal processing unit, and thus a complicated configuration, that is, a control software or a complex hardware structure, has a problem in that the price is not competitive.

The present invention has been proposed to solve the above problems, and its object is to simply implement a hardware repeat function in a plurality of communication nodes to communicate with each other, thereby ensuring stable operation by repeat operation to adjacent nodes even in a poor communication channel. SUMMARY OF THE INVENTION An object of the present invention is to provide a power line communication repeater using frequency conversion that can communicate and can be implemented simply and inexpensively.

In order to achieve the above object of the present invention, the power line communication repeater of the present invention

A coupler connected to one end of the power line to perform signal detection on the power line and signal coupling to the power line;

A first band pass filter connecting one end to the other end of the coupler and bidirectionally passing a signal to a first frequency band which is preset;

A first low noise amplifier configured to be turned on / off according to the signal level of the other end of the first band pass filter, and to amplify the signal at the other end of the first band pass filter with low noise during operation;

An oscillator for generating a preset frequency;

An upmixer for upconverting the signal from the first low noise amplifier to the oscillation frequency of the oscillator;

A second bandpass filter for passing the signal from the upmixer to a second preset frequency band;

A first amplifier for amplifying the signal from the second bandpass filter to a first predetermined gain;

A third band pass filter which connects one end to an output end of the first amplifier and the other end to the other end of the coupler and bidirectionally passes a signal through a second frequency band which is preset;

A second low noise amplifier configured to be turned on / off according to a signal level at the other end of the first amplifier, and to amplify the signal at the other end of the first amplifier with low noise during operation on;

A downmixer for downconverting the signal from the second low noise amplifier to the oscillation frequency of the oscillator;

A third bandpass filter for passing the signal from the downmixer to a preset first frequency band;

A second amplifier for amplifying the signal from the third bandpass filter with a second preset gain and outputting the signal from the first bandpass filter to the signal line between the first low noise amplifier;

Power line communication repeater using a frequency conversion characterized in that it comprises a.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings referred to in the present invention, components having substantially the same configuration and function will use the same reference numerals.

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

Referring to FIG. 2, a power line communication repeater according to the present invention has a coupler 21 connected to one end of a power line PL to perform signal detection on the power line PL and signal coupling to the power line PL. And a first band pass filter 22 which connects one end to the other end of the coupler 21 to pass the signal bidirectionally in a first frequency band BW1, and the first band pass filter 22. A first low noise amplifier 23 which is operated on / off according to the signal level of the other end of the first stage, and amplifies the signal of the other end of the first bandpass filter 22 at low noise, and a preset frequency An upmixer 25 that upconverts the signal from the first low noise amplifier 23 to the oscillation frequency of the oscillator 24, and a signal from the upmixer 25 in advance. A second band pass filter 26 which passes through the second frequency band BW2 set in FIG. A first amplifier 27 which amplifies the signal from the two band pass filter 26 to a first gain G1 set in advance, and one end thereof are connected to an output terminal of the first amplifier 27, and the coupler 21 is connected. And a third band pass filter 28 which connects the other end to the other end and transmits the signal bidirectionally to the preset second frequency band BW2.

In addition, the power line communication repeater of the present invention is operated on / off in accordance with the signal level of the other end of the first amplifier 27, a second to amplify the signal of the other end of the first amplifier 27 at low noise during operation A low noise amplifier 33, a down mixer 34 which downconverts the signal from the second low noise amplifier 33 to the oscillation frequency of the oscillator 25, and a signal from the down mixer 34 A fourth band pass filter 35 passing through the first frequency band BW1 preset and a signal from the fourth band pass filter 35 being amplified by a second gain G2 set in advance; And a second amplifier 36 outputting the signal line between the first band pass filter 22 and the first low noise amplifier 23.

Meanwhile, the first bandpass filter 22 and the fourth bandpass filter 35 pass through a first frequency band, where the first frequency band BW1 may be set to approximately 2-20 MHz. In addition, the second band pass filter 26 and the third band pass filter 28 pass through a second frequency band, where the second frequency band BW2 may be set to approximately 25-43 MHz.

In addition, referring to FIG. 2, the first low noise amplifier 23 compares the signal level of the other end of the first bandpass filter 22 with a preset first level VREF1 to determine the signal level of the other end. When the first level VREF1 is higher than the first level VREF1, the operating voltage is supplied through the first operation selector 23A and the first operation selector 23A, which blocks the supply of the operating voltage. A low noise AGC 24 which AGCs the signal at the other end of the circuit 22 in low noise.

The second low noise amplifier 33 compares the signal level of the other end of the first amplifier 27 with a preset second level VREF2 so that the signal level of the other end is greater than the second level VREF2. If high, the second operation selector 33A which cuts off the supply of the operating voltage and the operation voltage are supplied through the second operation selector 33A, and the AGC signal of the other end of the first amplifier 27 is low noise. Low noise AGC 33B.

The first gain G1 of the first amplifier 27 is set such that the level of the output signal of the first amplifier 27 is higher than the second reference level VREF2 of the second operation selector 33A. . In addition, the second gain G2 of the second amplifier 36 is such that the level of the output signal of the second amplifier 36 is higher than the first reference level VREF1 of the first operation selector 23A. Is set.

Hereinafter, the operation and effects of the present invention will be described in detail with reference to the accompanying drawings.

The present invention is connected to a power line and amplified a signal of the first frequency band through the power line and then converted to a signal of the second frequency band to provide a power line again, and after amplifying the signal of the second frequency band through the power line The signal is converted into a signal of the first frequency band and provided again to the power line, which will be described in detail with reference to FIGS. 2 to 4.

The power line communication repeater of the present invention shown in FIG. 2 is an apparatus for relaying a signal by amplifying an input signal, which is a first signal path as shown in FIG. 3 and a frequency band of the signal. A second signal path is formed, which will be described in detail below.

3 is a circuit diagram illustrating a first signal path of the power line communication repeater of FIG. 2. Referring to FIGS. 2 and 3, the signal flow according to the first signal path of the power line communication repeater of the present invention will be described below.

First, the coupler 21 of the power line communication repeater of the present invention detects and outputs a signal from the power line PL, wherein the frequency band of the signal detected by the coupler 21 is a first frequency band, for example, approximately 2- In the case of 20 MHz, the signal of the first frequency band output from the coupler 21 passes through the first band pass filter 22 but is blocked by the third band pass filter 28.

Thereafter, the first low noise amplifier 23 of the present invention is turned on / off according to the signal level of the other end of the first band pass filter 22, and the other end of the first band pass filter 22 is turned on when the first low noise amplifier 23 is operated. Amplifies the signal with low noise, which will be described in detail below.

The first operation selector 23A of the first low noise amplifier 23 compares the signal level of the other end of the first bandpass filter 22 with a preset first level VREF1 to signal the other end. When the level is higher than the first level VREF1, the supply of the operating voltage is cut off. Here, the signal level at the other end is set lower than the first level VREF1 since there is no separate amplification process, and thus the operating voltage is low. By supplying to the AGC 23B, the low noise AGC 23B AGC the signal at the other end of the first bandpass filter 22 with low noise.

Then, the upmixer 25 upconverts the signal from the first low noise amplifier 23 to the oscillation frequency of the oscillator 24. In this upconversion process, the input signal of about 1-20 MHz is approximately It is converted into a signal of 25-43MHz. The second bandpass filter 26 then passes the signal from the upmixer 25 into a preset second frequency band BW2, i.e., a frequency band in the range of approximately 25-43 MHz. The first amplifier 27 amplifies the signal from the second bandpass filter 26 to a first gain G1 set in advance.

Meanwhile, the first gain G1 of the first amplifier 27 is such that the level of the output signal of the first amplifier 27 is higher than the second reference level VREF2 of the second operation selector 33A. In addition, the second operation selector 33A of the second low noise amplifier 33 may compare the signal level at the other end of the first amplifier 27 with the preset second level VREF2. When the signal level at the other end is higher than the second level VREF2, the supply of the operating voltage is cut off, so that the low noise AGC 33B of the second operation selector 33A does not operate.

Accordingly, the signal output from the first amplifier 27 is output through the third band pass filter 28 to the other end of the coupler 21, and at this time, the signal provided to the other end of the coupler 21 A second frequency band in the range of approximately 25-43 MHz, which is cut off in the first bandpass filter 22 and coupled to the power line PL through the coupler 21.

In summary, the signal input through the coupler 21 enters the first low noise amplifier 23 through the first band pass filter 22 that passes only the original signal band (2 to 20 MHz). The low noise amplifier 23 adjusts the gain of the incoming weak signal to a constant level, and up-converts the signal via the upmixer 25. The first amplifier is then passed through a second bandpass filter 26 having a passband of an upwardly adjusted frequency (25-43Mhz) to remove the harmonic and parasitic components of the mixer, and to output an output that matches the reference level. After passing through (27), it is output through the coupler 21 via the third band pass filter 28. In this case, the first operating voltage selector 33A of the low noise amplifier 33 may compare the signal input from the first amplifier 27 or the signal input from the third bandpass filter 28 with a reference voltage to obtain a low noise AGC. By turning off 33B, the feedback is prevented to remove the rash.

As described above, the first signal path according to the present invention, the coupler 21, the first band pass filter 22, the first low noise amplifier 23, the upmixer 25, the second band pass filter 26 ), A first amplifier 27, a third band pass filter 28, and a coupler 21.

4 is a circuit diagram illustrating a second signal path of the power line communication repeater of FIG. 2. Referring to FIGS. 2 and 4, the signal flow according to the second signal path of the power line communication repeater of the present invention will be described below.

First, the coupler 21 of the power line communication repeater of the present invention detects and outputs a signal from the power line PL, wherein the frequency band of the signal detected by the coupler 21 is a second frequency band, for example, approximately 25-. In the case of 43MHz, the signal of the second frequency band output from the coupler 21 is blocked by the first bandpass filter 22, unlike the first signal path described above, and the third bandpass filter 28 Is passed in.

At this time, the signal of the second frequency band passing through the third band pass filter 28 is cut off from the first amplifier 27 and input to the second low noise amplifier 33, and the second low noise amplifier 33 ) Is turned on or off according to the signal level of the third band pass filter 28, and amplifies the signal from the first band pass filter 22 at low noise during operation. Same as

The second operation selector 33A of the second low noise amplifier 33 compares the signal level of the third bandpass filter 28 with a preset second level VREF2 to determine the third bandpass filter. If the signal level of 28 is higher than the second level VREF2, the supply of the operating voltage is cut off. Here, since the signal level of the third bandpass filter 28 does not have a separate amplification process, the second level VREF2 It is set lower, thereby supplying the operating voltage to the low noise AGC 33B, so that the low noise AGC 33B AGC the signal of the third bandpass filter 28 at low noise.

Thereafter, the downmixer 34 downconverts the signal from the second low noise amplifier 33 to the oscillation frequency of the oscillator 24. In this downconversion process, an input signal of approximately 20-43 MHz is approximately It is converted into a signal of 2-20MHz. Then, the fourth bandpass filter 35 passes the signal from the downmixer 34 into the preset first frequency band BW2, that is, the frequency band in the range of approximately 2-20 MHz. The second amplifier 36 amplifies the signal from the fourth bandpass filter 35 with a preset second gain G2 to between the first bandpass filter 22 and the first low noise amplifier 23. Output to the signal line of.

On the other hand, the second gain G2 of the second amplifier 36 is such that the level of the output signal of the second amplifier 36 is higher than the first reference level VREF1 of the first operation selector 23A. In addition, the first operation selector 23A of the first low noise amplifier 23 compares the signal level of the second amplifier 36 with a preset first level VREF1 to perform the second operation. When the signal level of the amplifier 36 is higher than the first level VREF1, the supply of the operating voltage is cut off, so that the low noise AGC 33B of the second operation selector 33A does not operate.

Accordingly, the signal output from the second amplifier 36 is coupled to the power line PL by the coupler 21 after passing through the first band pass filter 22.

To summarize the operation as described above, first received by the coupler (1) and then the frequency band (25 ~ 43Mhz) signal adjusted up through the third band pass filter 28 to the second low noise amplifier 33 In this case, the second low noise amplifier 33 adjusts the gain of the weak signal input to a predetermined level, and the signal is down-converted through the down mixer 34. It then passes through a fourth bandpass filter 35 having a passband of down-adjusted frequency (2-20 MHz) to remove the harmonic and parasitic components of the downmixer, and outputs a second output to meet the reference level. After passing through the amplifier 36, it is output through the coupler 21 via the first band pass filter 22.

As described above, the second signal path according to the present invention is a coupler 21, a third band pass filter 28, a second low noise amplifier 33, a down mixer 34, and a fourth band pass filter 35. ), A second amplifier 36, a first band pass filter 22, and a coupler 21.

According to the present invention as described above, the present invention in the power line communication repeater using the frequency conversion, in particular by implementing a hardware repeat function to a plurality of communication nodes to be communicated easily, even if the communication channel is poor to the adjacent node The repeat operation enables stable communication, and there is an effect that can be implemented simply and inexpensively.

Since the above description is only a description of specific embodiments of the present invention, the present invention is not limited to these specific embodiments, and various changes and modifications of the configuration are possible from the above-described specific embodiments of the present invention. It will be apparent to those skilled in the art to which the present invention pertains.

1 is a block diagram of a conventional data acquisition apparatus having a repeater function.

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

3 is a circuit diagram illustrating a first signal path of the power line communication repeater of FIG. 2.

4 is a circuit diagram illustrating a second signal path of the power line communication repeater of FIG. 2.

Explanation of symbols on the main parts of the drawings

21: coupler 22: first band pass filter

23: first low noise amplifier 24: oscillator

25: upmixer 26: second bandpass filter

27: first amplifier 28: third band pass filter

33: second low noise amplifier 34: downmixer

35: third band pass filter 36: second amplifier

Claims (5)

A coupler 21 connected to one end of the power line PL to perform signal detection on the power line PL and signal coupling to the power line PL; A first band pass filter 22 which connects one end to the other end of the coupler 21 and bidirectionally passes a signal through a first frequency band BW1 preset; A first low noise amplifier 23 which is operated on / off according to the signal level of the other end of the first band pass filter 22 and amplifies the signal of the other end of the first band pass filter 22 with low noise during operation on ); An oscillator 24 for generating a preset frequency; An upmixer 25 for upconverting the signal from the first low noise amplifier 23 to the oscillation frequency of the oscillator 24; A second bandpass filter 26 for passing the signal from the upmixer 25 to a second predetermined frequency band BW2; A first amplifier 27 for amplifying the signal from the second band pass filter 26 with a first gain G1 preset; A third band pass filter for connecting one end to an output end of the first amplifier 27 and the other end to the other end of the coupler 21 to bi-directionally pass a signal through a second frequency band BW2 that is set in advance; 28); A second low noise amplifier 33 which is operated on / off according to the signal level of the other end of the first amplifier 27 and amplifies the signal of the other end of the first amplifier 27 with low noise during operation on; A downmixer 34 for downconverting the signal from the second low noise amplifier 33 to the oscillation frequency of the oscillator 25; A fourth bandpass filter 35 for passing the signal from the downmixer 34 to a first frequency band BW1 preset; A fourth signal that amplifies the signal from the fourth band pass filter 35 to a second gain G2 which is set in advance and outputs the signal line between the first band pass filter 22 and the first low noise amplifier 23; 2 amplifiers (36) Power line communication repeater using a frequency conversion characterized in that it comprises a. The method of claim 1, wherein the first low noise amplifier 23 Comparing the signal level of the other end of the first band pass filter 22 with a preset first level VREF1 to block the supply of the operating voltage when the signal level of the other end is higher than the first level VREF1. An operation selector 23A; And A low noise AGC 24 that receives an operating voltage through the first operation selector 23A and AGCs a signal at the other end of the first bandpass filter 22 with low noise. Power line communication repeater using a frequency conversion comprising a. The method of claim 1, wherein the second low noise amplifier 33 Selecting a second operation that cuts off the supply of the operating voltage when the signal level at the other end is higher than the second level VREF2 by comparing the signal level at the other end of the first amplifier 27 with the preset second level VREF2. Part 33A; And A low noise AGC 33B which receives an operating voltage through the second operation selector 33A and AGCs the signal at the other end of the first amplifier 27 with low noise. Power line communication repeater using a frequency conversion comprising a. The method of claim 3, wherein the first gain G1 of the first amplifier 27 is And a level of the output signal of the first amplifier (27) is set to be higher than a second reference level (VREF2) of the second operation selector (33A). The method of claim 2, wherein the second gain G2 of the second amplifier 36 is And a level of the output signal of the second amplifier (36) is set higher than a first reference level (VREF1) of the first operation selector (23A).