KR20100103032A - Apparatus for data communication using ac power line - Google Patents

Abstract

PURPOSE: A data communication device using an AC power line is provided to simplify a device, thereby saving manufacture costs of a device. CONSTITUTION: A zero cross reference generating circuit(210) receives an AC voltage between power lines, L(130) and N(120), to generate a reference signal. A microcontroller(220) stores a signal pattern based on the zero-cross reference signal created in the zero-cross reference generator circuit in the power line L. The microcontroller generates an oscillation control signal according to the stored signal pattern. An oscillation circuit unit(230) outputs an oscillation signal which is 0 or 1.

Description

Data communication device using AC power line {Apparatus for data communication using AC power line}

The present invention relates to a communication apparatus using a power line, and more particularly, to a data communication apparatus configured to communicate without additional control lines by adding a specific signal to an existing commercial AC power line.

Power line communication (PLC) refers to a communication method of transmitting and receiving data signals through a power line wired for power supply to a home or an office. That is, the power line communication can be implemented by modulating and transmitting a data signal to an AC line as a high frequency signal, and separately receiving the signal using a high frequency filter having a 50 Hz or 60 Hz cutoff frequency.

Such power line communication has an advantage of not having to bear the cost of additional wiring work because a network can be constructed using existing wiring. In addition, it is widely applied to various wired / wireless network solutions because even after the network is established, it can be added to the network simply by plugging in additional devices.

However, in such power line communication, since device configuration is determined depending on a method of adding a signal to a power line, a power line communication device adopting a signal adding method that enables the device to be configured as simply as possible is required.

Accordingly, the problem to be solved by the present invention is to provide a data communication apparatus using an AC power line, which adopts a signal addition method that allows a simple device configuration.

The data communication apparatus using the AC power line of the present invention for solving the above technical problem, AC power line for transmitting data at the transmitting end using the power lines L and N, and receiving data at the receiving end forming a closed circuit with the transmitting end As a data communication device using

The transmitting end:

A zero cross reference generation circuit configured to receive an AC voltage between the power lines L and N and generate a zero cross reference signal;

A micro controller configured to store a signal pattern to be mounted on the power line L based on the zero cross reference signal generated by the zero cross reference generation circuit, and generate an oscillation control signal according to the stored signal pattern;

An oscillation circuit unit which receives the oscillation control signal from the microcontroller and is controlled and outputs a length of an oscillation signal corresponding to "0" or "1";

And a driving circuit unit configured to receive the length of the oscillation signal from the oscillation circuit unit and determine a transmission data signal by loading the current ramp amount on the power line L.

Here, the receiving end:

A receiving unit detecting a signal loaded on the power line;

A reception control unit configured to control a load by restoring a signal sensed by the reception unit;

A load controlled by the reception controller;

It may be provided.

It is also preferable that the frequency of the transmission data signal is in the range of 10 Hz to 100 Hz.

According to the present invention, since the signal addition method that allows the device to be simply configured is adopted, the device configuration is simple and the manufacturing cost of the device can be reduced. In addition, the existing power line communication is suitable where a large amount of data transmission and reception is required, but the present invention is suitable for a system for transmitting and receiving low-speed low-capacity data. And, unlike the existing power line communication, the signal is transmitted only in the system in which the closed loop of the transmitter and the receiver is formed, the signal size is also slightly larger than the noise size of the power line has the advantage that there is no effect on other devices.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The following examples are only presented to understand the content of the present invention, and those skilled in the art will be capable of many modifications within the technical spirit of the present invention. Therefore, the scope of the present invention should not be construed as being limited to these examples.

1 is a conceptual diagram of transmission and reception of a data communication apparatus using an AC power line according to the present invention. Referring to FIG. 1, the existing AC commercial power line includes an AC commercial power supply 110, an N (Neutral) line 120, and an L (Live) line 130. When the transmitter 140 transmits a specific signal to the L line 130 of the power line, the closed loop 160-1 receives the signal on the power line and receives the signal from the receiver 156-1 and the receiver controller 152-1. And it is delivered to the receiving end (150-1) consisting of a load (154-1). Each of the transmitter 140 and the receivers 150-1,..., 150 -N forms closed loops 160-1,..., 160 -N, between the transmitter and the receivers included in the respective closed loops. The transmission and reception of a signal occurs at. The number of loads is determined by the size of the transmission signal of the transmitter 140. That is, the transmission signal is cut and inserted into the L line 130, and the receiver of the receiving end also detects the signal in a cut and inserted form the L line 130. In the conceptual diagram, a specific signal is carried on the L line 130 of the power supply line, but in some cases, the specific signal may be loaded on the N line 120 of the power supply line.

2 is a schematic structural diagram of a transmitting end of a data communication apparatus using an AC power line according to the present invention. Referring to FIG. 2, the transmitter 140 includes a zero cross reference generator 210, a microcontroller 220, an oscillator circuit 230, and a driver circuit 240. The zero cross reference generation circuit 210 receives a voltage across the power supply line L 130 and the N 120 to generate a zero cross reference signal. The zero cross reference signal refers to a signal indicating a position where voltages of the power lines L 130 and N 120 cross each other, and are represented by pulse signals as shown in FIG. Can be. The microcontroller 220 stores a signal pattern to be mounted on the power line L 130 based on the zero cross reference signal generated by the zero cross reference generation circuit 210, and the oscillation control signal according to the stored signal pattern. Generates. The oscillation control signal from the microcontroller 220 controls the oscillation circuit 230 to output the length of the oscillation signal corresponding to "0" or "1". The driver circuit unit 240 receives the length of the oscillation signal from the oscillator circuit 230 and determines the transmission data signal by loading the current ramp amount on the power line L 130.

3 is a diagram of an actual circuit example of a transmitting end of a data communication apparatus using an AC power line according to the present invention. Referring to FIG. 3, when a zero cross signal is generated by the zero cross reference generation circuit 210 including a photo coupler from an AC commercial power supply and transmitted to the micro controller 220, the micro controller 220 may be configured based on the zero cross signal. Transistor Q13 is controlled through the D out terminal by generating a signal on the commercial power line. The oscillator of the U20 including the oscillator circuit 230 is controlled by the transistor Q13 to switch the power element M2 to drive the transformer T1, which is the power transmission element, and the signal to be loaded on the AC commercial power line is transmitted by the T1. Will be loaded. Transformer T1 can carry a signal equivalent to an active element (triac, SCR, MOSFET, BJT). The power device M2 and the transformer T1 form the driving circuit unit 240.

4 is a view for explaining examples of generating a transmission data signal transmitted in a data communication apparatus using an AC power line according to the present invention. Figure 4 shows an example of applying a 6-bit data signal of "110110" to the AC commercial power line, it can be seen that the data can be loaded and transmitted in the same manner as <c>, <d>, <e> have. That is, in FIG. 4, <a> is a voltage waveform of an AC commercial power supply, and <b> is a pulse waveform indicating a zero crossing reference point as a signal for detecting zero crossing.

In Fig. 4C, a method of setting a signal at a predetermined position with reference to a reference point is &quot; 1 &quot;, and a " 0 " In Figures <c> to <e> of FIG. 4, portions indicated by hatched lines indicate portions on which signals are carried, and horizontal lengths of portions indicated by hatched portions indicate lengths of signals to be loaded.

In FIG. 4D, a method of setting a signal when the signal is loaded at a predetermined position on the basis of the reference point is short, and "0" when the signal loading period is long.

In <e> of FIG. 4, two different positions are determined based on a reference point, and when a signal is placed in position 1, the signal is "1". It shows the method to make it.

The signal generated in this manner can reproduce a 6-bit data signal of " 110110 " when demodulating at a receiver to be described later.

Although some examples of generating signals have been described above, the present disclosure is not limited thereto, and the signals may be generated in various ways. For example, in the methods described in <c> to <e> in FIG. 4, "1" and "0" may be specified in the reverse manner of specifying "1" and "0".

4 is an enlarged view of the transmission data signal 320 loaded on the AC current 310 flowing through the AC power line. The frequency of the transmission data signal 320 carried on the AC current 310 is determined in a few tens of GHz band which is much higher than the commercial frequency of the AC current 310 of the power line 50 to 60 kHz. However, if you increase this frequency too much, it may cause electromagnetic interference to other devices.

Now let's look at the receiving end to recover the data signal transmitted from the transmitting end. As shown in FIG. 1, the receiver corresponds to each of the receivers 150-1,..., 150 -N that form a closed circuit together with the transmitter 140, referring to one receiver denoted by reference numeral 150-1. The receiving end includes a receiving unit 156-1 for detecting a signal loaded on the power line L, a receiving control unit 152-1 for restoring the detected received signal, and a load 154-1. do. Multiple receivers can be connected in parallel. The number of loads depends on the size of the transmitted signal.

6 is a diagram of an actual circuit example of a receiving end of a data communication apparatus using an AC power line according to the present invention. In Fig. 6, only a few tens of data signal components corresponding to data except for 50-60 Hz components, which are power frequency components, of the AC power line signal are alternating current components through the transformer of L1A2 included in the receiver 156-1. Only the signal (square wave component of Fig. 5) is detected. The detected signal is integrated by the resistor R and the capacitor C and produces a width corresponding to "1" and "0" sent from the transmitter. The signal is restored to a clean square wave by a comparator, and the bit signal transmitted by the transmitter is sent to the microcontroller included in the reception controller 152-1. The microcontroller analyzes the meaning of the signal sent from the transmitter by analyzing the received bit signal. An example of the analyzed data signal of the transmitting end is shown in FIG. 7. According to the signal thus analyzed, the microcontroller controls the state of the load 154-1, thereby completing the final reception control process. Through this transmission and reception process, it is possible to control only the power line without additional control line or signal line.

Referring to Fig. 7, &quot; c &quot; becomes " 1 " if there is a signal based on the reference point, and " 0 " <d> is " 1 " for a short time that a signal is present with respect to a reference point, and " 0 " for a long time. <e> becomes " 1 " when the signal is present in position 1 with respect to the reference point, and becomes " 0 " At this time, as in the transmitting end, "1" and "0" may be reversed.

In addition, in the case of <c> and <d>, even if there is no reference point of <b>, there is no problem in restoring a signal. That is, in the case of <c>, if a signal is received after a certain time after receiving the first bit signal "1", a bit signal "1" exists. If a signal is not received after a certain time, the bit signal "0" is received. will be. In the case of <d>, since a signal is received at a predetermined time interval, only the pulse length of the received signal may be checked to restore the transmission signals of "0" and "1".

1 is a conceptual diagram of transmission and reception of a data communication apparatus using an AC power line according to the present invention;

2 is a schematic structural diagram of a transmitting end of a data communication apparatus using an AC power line according to the present invention;

3 is a diagram of an actual circuit example of a transmitting end of a data communication apparatus using an AC power line according to the present invention;

4 is a view for explaining examples of generating a transmission data signal transmitted in a data communication apparatus using an AC power line according to the present invention;

5 is an enlarged view of a transmission data signal loaded on an AC current flowing through an AC power line;

6 is a diagram of an actual circuit example of a receiving end of a data communication apparatus using an AC power line according to the present invention; And

7 is a diagram illustrating an example of a data signal of a transmitter analyzed at a receiver.

Explanation of reference numerals for main parts of the drawings

110: AC commercial power 120: N (Neutral) line

130: L (Live) line 140: transmitting end

150-1,... , 150-N: receivers 152-1,... , 152-N: reception controllers

154-1,... 154-N: loads 156-1,... , 156-N: receivers

210: zero cross reference generation circuit

220: microcontroller 230: oscillation circuit portion

240: driving circuit

Claims (6)

In the data communication apparatus using the AC power line for transmitting data at the transmitting end using the power lines L and N and receiving data at the receiving end forming the closed circuit with the transmitting end, The transmitting end: A zero cross reference generation circuit configured to receive an AC voltage between the power lines L and N and generate a zero cross reference signal; A micro controller configured to store a signal pattern to be mounted on the power line L based on the zero cross reference signal generated by the zero cross reference generation circuit, and generate an oscillation control signal according to the stored signal pattern; An oscillation circuit unit which is controlled by receiving an oscillation control signal from the microcontroller and outputs a length of an oscillation signal corresponding to "0" or "1"; A driving circuit unit which receives the length of the oscillation signal from the oscillation circuit unit and determines the transmission data signal by loading the current ramp amount on the power line L; Characterized in that the data communication apparatus using the AC power line. The method of claim 1, wherein the receiving end: A receiving unit detecting a signal loaded on the power line; A reception control unit configured to control a load by restoring a signal sensed by the reception unit; A load controlled by the reception controller; Characterized in that the data communication apparatus using the AC power line. The data communication apparatus according to claim 1, wherein the frequency of said transmission data signal is in the range of 10 Hz to 100 Hz. The method of claim 1, wherein the signal pattern to be mounted on the power line L is: And a signal pattern designed to determine "1" when a signal is loaded at a predetermined position based on the reference signal, and "0" when no signal is loaded. The method of claim 1, wherein the signal pattern to be mounted on the power line L is: AC power line, characterized in that the signal pattern is made to be determined to be "1" if the period of loading the signal is short when the signal is loaded at a certain position on the basis of the reference signal; Data communication device using. The method of claim 1, wherein the signal pattern to be mounted on the power line L is: A signal pattern designed to determine two different positions in order to load a signal at a predetermined position based on the reference signal and to determine "1" when a signal is loaded in position 1 and "0" when a signal is loaded in position 2 A data communication device using an AC power line, characterized in that the.

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