KR102351139B1 - Two line non-polar communication system - Google Patents

Abstract

A two-wire non-pole communication system is disclosed. In the two-wire nonpolar communication system according to the embodiment of the present invention, in order to use the communication line without distinction of polarity, the bridge circuit included in the remote device is designated with the cathode of the first diode, the anode of the second diode, and the first communication line. One end of the first capacitor is connected, the cathode of the third diode, the anode of the fourth diode, the second communication line, and one end of the designated second capacitor are connected, the anode of the first diode and the other end of the first capacitor and the third The anode of the diode and the other side of the second capacitor are connected to a ground terminal, and the cathode of the second diode and the cathode of the fourth diode are provided in the remote device and are supplied with power from the communication line and are connected to a power circuit generating power of the remote device and a discharge unit for discharging the first capacitor and the second capacitor when the main device is transmitted.

Description

Two line non-polar communication system

The present invention relates to a two-wire radio communication system.

In the house, boiler communication, room control communication, home auto communication, etc. communicate using wires such as UTP and TIV to communicate at a low price on a regular power supply. Although such wired communication is cheaper than wireless communication, since the communication line is connected from several meters to 100 meters, it is inevitably vulnerable to induced noise.

Therefore, research on noise removal in such two-wire non-polarity communication is being actively conducted.

Publication No. 2009-0099318 (published on September 22, 2009) Non-polar data signal receiver

An object of the present invention is to provide a two-wire non-polarized communication system that minimizes the effect of noise during communication between devices by supplementing the parts vulnerable to noise during communication.

Objects other than the present invention will be easily understood through the following description.

According to one aspect of the present invention, in a two-wire non-polar communication system, a bridge circuit included in a remote device to use the polarity of a communication line without distinction is a first communication with the cathode of the first diode and the anode of the second diode. A line and one end of a designated first capacitor are connected, the cathode of the third diode, the anode of the fourth diode, and a second communication line and one end of the designated second capacitor are connected, the anode of the first diode and the first capacitor The other end of the third diode and the other end of the second capacitor are connected to a ground terminal, and the cathode of the second diode and the cathode of the fourth diode are provided in the remote device to receive power from the communication line. A two-wire non-pole communication system may be provided which is connected to a power circuit for generating power of the remote device and includes a discharge unit for discharging the first capacitor and the second capacitor when the main device is transmitted.

In addition, the main device includes a power supply circuit for supplying power to the remote device, a main device-side transmitting circuit for varying the voltage of a communication line connected to the remote device, and a voltage of the communication line to detect communication. It may include a receiving circuit on the main device side.

In addition, the remote device may include a remote device-side transmitting circuit for varying the voltage of the communication line, and a remote device-side receiving circuit for sensing communication by sensing the voltage of the communication line.

In addition, the discharge unit includes a resistor having one end connected to the cathode of the second diode and the cathode of the fourth diode, a switch connecting the other end of the resistor to a ground terminal, and turning on or off the switch. (turn off) may include a determination module.

In addition, when the current value of the communication line is greater than or equal to a designated first reference value and less than a designated second reference value, the determination module may determine that the main device is transmitting and turn on the switch.

In addition, when the current value of the communication line is equal to or greater than the second reference value, the determination module may determine that the remote device is transmitting and turn off the switch.

In addition, when the voltage value of the communication line is less than the third reference value, the determination module may determine that the main device is transmitting and turn on the switch.

In addition, in the determination module, the remote device-side transmitting circuit When it is changed to be less than the third reference value, it is possible to maintain the turn-off of the switch.

According to an embodiment of the present invention, there is an advantage in that the influence of noise during communication between devices can be minimized.

1 is a diagram illustrating a conventional two-wire non-pole communication system.
FIG. 2 is a diagram illustrating a voltage in the communication line of FIG. 1 .
3 is a diagram illustrating noise generated in a conventional two-wire non-polarized communication system.
4 is a diagram illustrating voltage and current of a communication line.
5 is a diagram illustrating a current flowing in a bridge circuit and a diode characteristic graph when the main device is transmitted.
6 to 9 are diagrams illustrating first to fourth attempts for solving the problems of the prior art.
10 is a graph illustrating a distorted transmission waveform according to the second attempt.
11 is an embodiment of a two-wire non-pole communication system according to an embodiment of the present invention.
12 is a diagram illustrating a communication line voltage, a current, and a determination module voltage referenced to explain a two-wire non-pole communication system according to an embodiment of the present invention.

Since the present invention can apply various transformations and can have various embodiments, specific embodiments are illustrated in the drawings and described in detail in the detailed description. However, this is not intended to limit the present invention to specific embodiments, and should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

In describing the present invention, if it is determined that a detailed description of a related known technology may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. In addition, numbers (eg, first, second, etc.) used in the description process of the present specification are only identification symbols for distinguishing one component from other components.

Also, throughout the specification, when an element is referred to as “connected” or “connected” with another element, the one element may be directly connected or directly connected to the other element, but in particular It should be understood that, unless there is a description to the contrary, it may be connected or connected through another element in the middle.

In addition, throughout the specification, when a part "includes" a certain component, it means that other components may be further included, rather than excluding other components, unless otherwise stated. In addition, terms such as "unit" and "module" described in the specification mean a unit that processes at least one function or operation, which means that it can be implemented as one or more hardware or software or a combination of hardware and software . Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 1 is an example of a conventional two-wire non-pole communication system, Figure 2 is an example of the voltage of the communication line.

Referring to FIG. 1 , the main device 100 communicates with the remote device 110 by changing the voltage using the remote device 110 and two wires while the main device 100 is always connected to power to enhance the power to the communication line 120 . can be performed.

The main device 100 includes a power supply circuit 102 for supplying power to the remote device 110 and a main device-side transmitting circuit 104 for varying the voltage of the communication line 120 connected to the remote device 110 . and a main device-side receiving circuit 106 for sensing communication by sensing the voltage of the communication line 120 .

The remote device 110 includes a bridge circuit 112 for using the polarity of the communication line 120 without distinction, a remote device-side transmitting circuit 114 for varying the voltage of the communication line 120 , and a communication line 120 . It may include a remote device-side receiving circuit 116 for sensing the communication by sensing the voltage of the.

Referring to FIG. 2 , when the main device 100 and the remote device 110 do not transmit/receive data, the voltage of the communication line is maintained at a constant voltage. In addition, the main device 100 and the remote device 110 vary the voltage of the communication line using each of the transmission circuits (ie, the main device-side transmission circuit 104 and the remote device-side transmission circuit 114). , it is possible to receive data by sensing the voltage of the communication line using each of the receiving circuits (ie, the main device-side receiving circuit 106 and the remote device-side receiving circuit 116).

3 is an example of noise generated in a conventional 2-wire non-polarized communication system, FIG. 4 is an example of voltage and current of a communication line, and FIG. 5 is an example of a current flowing in a bridge circuit when transmitting a main device and a diode characteristic graph to be.

Referring to FIG. 3 , a circled portion is an example of noise generated during transmission of the main device 100 . If noise is generated in the transmitted data when the main device 100 is transmitted, the remote device 110 may not receive the correct data, causing a malfunction or failure.

Referring to FIG. 4 , when there is no transmission data from the main device 100 , the remote device 110 receives power from the communication line 120 and consumes current through a power circuit that generates power for the remote device 110 . do. When the main device 100 transmits data, since the input voltage of the power circuit of the remote device 110 is higher than the voltage of the communication line 120 , the current cannot be drawn from the communication line 120 . Accordingly, as shown in FIG. 4 , a relatively small amount of current flows in the communication line 120 when the main device 100 transmits data.

On the other hand, since the remote device 110 fluctuates the communication line 120 voltage when transmitting data to the remote device 110 , a remote device transmission current greater than the remote device 110 power current may flow in the communication line 120 . have.

Referring to FIG. 5 , in the bridge circuit provided in the remote device 110 to remove the polarity of the communication line 120 , the flow of current when the main device 100 is transmitted is exemplified. As described above, the current flowing through the D2 diode 502 and the D3 diode 504 when the remote device 110 transmits is very small. In this case, referring to the current-voltage characteristic graph of the diode shown on the right, when the current flowing through the diode is very small, the diode has a high impedance, and thus the D2 diode 502 and the D3 diode ( 504) has a high impedance. At this time, when noise is generated from the outside, a small current fluctuates due to the noise, and the voltage across the D2 diode 502 and the D3 diode 504 greatly fluctuates even with a small change in the current.

Accordingly, when the main device 100 is transmitted in the conventional two-wire non-polar communication system, the remote device 110 is placed in a very sensitive state to noise.

In addition, if it is assumed that the remote device 110 uses its own power source, since almost no current flows through the bridge circuit even when not communicating, a problem occurs in that it is placed in a noise-sensitive state as described above.

6 to 9 are examples of the first to fourth attempts to solve the problems of the prior art, and FIG. 10 is a graph illustrating a distorted transmission waveform according to the second attempt.

Referring to FIG. 6 , as a first attempt to solve the problems of the prior art, a D3 diode 602 connecting the reference potential of the main device 100 and the reference potential of the remote device 110 when the main device 100 is transmitted. In order to prevent the impedance from becoming small and to minimize the influence of external noise, a C3 capacitor 604 of a specified value may be connected in parallel to the D3 diode 602 . In this case, since the impedance between the reference potential of the main device 100 and the remote device 110 becomes a small value, the voltage fluctuation across the D3 diode 602 becomes small, and as a result, the noise during transmission of the main device 100 becomes small. has a deterrent effect.

However, according to the above-described first attempt, the C3 capacitor 604 is connected in parallel only to the D3 diode 602 , so that the main device 100 and the remote device must be connected with different polarities.

In order to solve the problem of the first attempt, as in the second attempt illustrated in FIG. 7 , a method of additionally connecting the C1 capacitor 704 corresponding to the D1 diode 702 may be considered. However, according to the second attempt described above, the C3 capacitor 604 is charged by the power of the communication line 120 , and when the main device 100 is transmitted, as shown in the graph illustrated in FIG. 10 , the C3 capacitor 604 is There is a problem in that the waveform of the transmission data is distorted by the discharge.

In order to solve the problem of this second attempt, as in the third and fourth trials illustrated in FIGS. 8 and 9, resistors (R1, R3 in FIG. 8, R4 in FIG. 9) to minimize waveform distortion of transmitted data You may consider adding this. However, there is a problem in that the resistors (R1, R3 in FIG. 8, and R4 in FIG. 9) added in the third and fourth attempts described above always consume power from the communication line 120 . This immediately affects the communication line voltage level, and causes problems such as a shorter communication distance, and lower standby power efficiency.

The above-described first to fourth attempts are attempts to minimize noise in a two-wire non-pole communication system according to the prior art, and are not a prior art, but invent a two-wire non-pole communication system according to an embodiment of the present invention. Make it clear that it is an intermediate process or a part of it.

11 is an example of a two-wire non-polarity communication system according to an embodiment of the present invention, and FIG. 12 is a communication line voltage, current and determination module referenced to explain a two-wire non-polarity communication system according to an embodiment of the present invention. It is a diagram illustrating voltage.

In the two-wire non-pole communication system according to the embodiment of the present invention, redundant description of the same configuration as that of the conventional 2-wire non-pole communication system described with reference to FIG. 1 will be omitted.

Referring to FIG. 11 , the bridge circuit 112 included in the remote device 110 is a first diode 1101 in order to use the communication line without distinction of polarity in the two-wire nonpolar communication system according to the embodiment of the present invention. The cathode of the second diode 1102, the first communication line 1131 and one side of the designated first capacitor 1111 are connected, and the cathode of the third diode 1103 and the anode of the fourth diode 1104 are connected. and the second communication line 1132 and one side of the designated second capacitor 1113 are connected, the anode of the first diode 1101, the other side of the first capacitor 1111, and the anode and the second side of the third diode 1103 The other end of the second capacitor 1113 is connected to the ground terminal, and the cathode of the second diode 1102 and the cathode of the fourth diode 1104 are provided in the remote device 110 and receive power from the communication line to receive the power from the remote device 110 . ) is connected to the power supply circuit 1122 for generating power, and may include a discharge unit 1120 for discharging the first capacitor 1111 and the second capacitor 1113 when the main device 100 is transmitted.

The operations and functions of the first capacitor 1111 and the second capacitor 1113 according to the present embodiment have been described in the second attempt with reference to FIG. 7 above, and thus a redundant description will be omitted.

The two-wire non-pole communication system according to an embodiment of the present invention includes a discharge unit 1120 for discharging a first capacitor 1111 and a second capacitor 1113 when the main device 100 is transmitted.

The discharge unit 1120 includes a resistor 1124 having one end connected to the cathode of the second diode 1102 and the cathode of the fourth diode 1104 , and a switch 1126 connecting the other end of the resistor 1124 to a ground terminal. ) and a decision module 1128 for turning on or off the switch 1126 .

Here, the switch 1126 may be various switches known at the time of filing of the present invention, such as a transistor, etc., and it is clarified that the switch 1126 is not limited to the BJT illustrated in FIG. 11 .

12 , the determination module 1128 according to this embodiment determines that the main device 100 is transmitted when the current value of the communication line 120 is greater than or equal to a predetermined first reference value and less than a predetermined second reference value. Thus, the switch 1126 may be turned on. Here, the determination module 1128 may be implemented in various configurations at the time of filing of the present invention, such as an OPAMP or a comparator using a Zener Diode, and thus a detailed description thereof will be omitted.

Also, when the current value of the communication line 120 is equal to or greater than the second reference value, the determination module 1128 may determine that the remote device 110 is transmitting and turn off the switch 1126 .

Also, when the voltage value of the communication line 120 is less than the third reference value, the determination module 1128 may determine that the main device 100 is transmitting and turn on the switch 1126 .

Meanwhile, the voltage value of the communication line 120 may be formed to be less than the third reference value even when the remote device 110 is transmitted. However, since the determination module 1128 is included in the remote device 110, it can be recognized that the reason the voltage value of the communication line 120 is formed to be less than the third reference value is due to the operation of the transmitting circuit 114 of the remote device 110. have. Therefore, when the reason that the voltage value of the communication line 120 is lower than the third reference value is due to the operation of the transmission circuit 114 of the remote device 110 , the determination module 1128 may not turn off the switch 1126 . A method for the determination module 1128 to recognize that the voltage value of the communication line 120 is formed to be less than the third reference value due to the operation of the transmission circuit 114 of the remote device 110 is known to those skilled in the art through various previously disclosed techniques. Since it can be implemented by , a detailed description thereof will be omitted.

So far, a two-wire non-pole communication system according to an embodiment of the present invention has been described with reference to FIGS. 11 and 12 . According to the embodiment of the present invention, by selectively discharging the first capacitor 1111 and the second capacitor 1113 only when the main device 100 is transmitted, the waveform of the transmission data is not distorted and power consumption is small. There are advantages. This has the advantage that it has little effect on the voltage level of the communication line and has little effect on the communication distance and standby power efficiency.

Although the above has been described with reference to the embodiments of the present invention, those of ordinary skill in the art can variously modify the present invention within the scope not departing from the spirit and scope of the present invention described in the claims below. And it will be readily understood that it can be changed.

100: main device 110: remote device
120: communication line

Claims (8)

In the two-wire non-pole communication system,
In order to use the polarity of the communication line without distinction, the bridge circuit included in the remote device is connected to the cathode of the first diode, the anode of the second diode, the first communication line and one side of the designated first capacitor, and the cathode of the third diode. and the anode of the fourth diode, the second communication line, and one end of a designated second capacitor are connected, the anode of the first diode, the other end of the first capacitor, the anode of the third diode, and the other end of the second capacitor It is connected to a ground terminal, and the cathode of the second diode and the cathode of the fourth diode are provided in the remote device and are connected to a power circuit that receives power from the communication line and generates power of the remote device,
Comprising a discharge unit for discharging the first capacitor and the second capacitor when the main device is transmitted,
The discharge unit includes a resistor having one end connected to the cathode of the second diode and the cathode of the fourth diode, a switch connecting the other end of the resistor to a ground terminal, and turning the switch on or off off), including a determination module, a two-wire non-polar communication system.
According to claim 1,
The main device includes a power supply circuit for supplying power to the remote device, a main device-side transmitting circuit for varying the voltage of a communication line connected to the remote device, and a main device for sensing communication by sensing the voltage of the communication line. A two-wire non-polar communication system comprising a device-side receiving circuit.
3. The method of claim 2,
The remote device includes a remote device-side transmitting circuit for varying the voltage of the communication line, and a remote device-side receiving circuit for sensing communication by sensing the voltage of the communication line.
delete According to claim 1,
When the current value of the communication line is greater than or equal to a specified first reference value and less than a specified second reference value, the determination module determines that the main device is transmitting and turns on the switch, a two-wire non-polar communication system.
6. The method of claim 5,
When the current value of the communication line is equal to or greater than the second reference value, the determination module determines that the remote device is transmitting and turns off the switch.
According to claim 1,
When the voltage value of the communication line is less than a specified third reference value, the determination module determines that the main device is transmitted and turns on the switch, a two-wire non-polar communication system.
8. The method of claim 7,
The determination module is configured such that the remote device-side transmitting circuit is configured to control the transmission of the communication line. When the change is made to be less than the third reference value, the switch is maintained to be turned off, a two-wire radio communication system.

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