CN213072653U - Adaptive dynamic adjustment device for communication loop - Google Patents
Adaptive dynamic adjustment device for communication loop Download PDFInfo
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- CN213072653U CN213072653U CN202022369476.6U CN202022369476U CN213072653U CN 213072653 U CN213072653 U CN 213072653U CN 202022369476 U CN202022369476 U CN 202022369476U CN 213072653 U CN213072653 U CN 213072653U
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- 238000004891 communication Methods 0.000 title claims abstract description 65
- 230000003044 adaptive effect Effects 0.000 title claims description 9
- 230000005669 field effect Effects 0.000 claims description 18
- 230000005540 biological transmission Effects 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
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- 238000001914 filtration Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
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- 238000012544 monitoring process Methods 0.000 description 1
- 238000004801 process automation Methods 0.000 description 1
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Abstract
The utility model relates to a self-adaptive dynamic adjusting device for a communication loop, which adopts the technical proposal that a high-speed oscilloscope is connected in parallel between equipment closest to a resistor array unit and the resistor array unit, the output end of the high-speed oscilloscope is connected with the positive input end of a comparator through a first high-pass filter, the output end of a communication network power supply is connected with the negative input end of the comparator through a second high-pass filter, the output end of the comparator is connected with the input end of a threshold comparator, the output end of the threshold comparator is connected with the input end of a counter, the output end of the counter is connected with the input end of a matching resistor array unit, the invention controls the resistance value of the resistance accessed into the communication loop through the comparison of a difference value and a preset threshold, therefore, a negative feedback closed loop is formed, dynamic self-adaptive adjustment of the communication loop is realized, and the communication quality and the transmission reliability of the Profibus-DP communication loop can be effectively improved.
Description
Technical Field
The invention relates to a Profibus-DP communication loop and provides an adaptive dynamic adjusting device for the Profibus-DP communication loop.
Background
The Profibus fieldbus is an open digital communication system with wide application, in particular in the field of factory automation and process automation. It is suitable for both fast, time-critical applications and complex communication tasks. Hardware package that traditional Profibus communication loop mainly involvedComprises the following steps: profibus interface, communication medium, Profibus plug, repeater, photoelectric converter and terminal matching resistance etc.. A schematic circuit diagram of a Profibus-DP communication loop is shown in fig. 1, and mainly includes a communication network power supply S (called a communication master station), a twisted-pair communication cable, and N devices (X) attached to a communication network segment1-XNCalled communication slave station) and a terminal matching resistor RTerminal deviceAnd they are combined (connected in parallel) to form a Profibus-DP communication loop, and during field debugging, the traditional Profibus communication loop is found to have the following defects: firstly, the parameters of the terminal matching resistor in the Profibus-DP loop are often fixed, and the actual loop is affected by field wiring and external interference, which causes the change of the equivalent impedance of the communication loop, reduces the matching performance of the terminal matching resistor, and affects the communication quality and the transmission reliability. Secondly, the communication quality and the communication voltage of the Profibus-DP loop lack effective on-line monitoring functions, especially for the fluctuation of the communication loop caused by external interference, lack of effective dynamic regulation means, resulting in the reliability of the whole loop being affected. Therefore, how to improve the communication quality and the transmission reliability of the Profibus-DP loop becomes a problem that needs to be solved by those skilled in the art.
Disclosure of Invention
In view of the above situation, an object of the present invention is to provide an adaptive dynamic adjustment apparatus for a Profibus-DP communication loop, which can effectively improve the communication quality and transmission reliability of the Profibus-DP communication loop.
The technical scheme of the invention is as follows:
a self-adaptive dynamic adjusting device for a Profibus-DP communication loop comprises a communication network power supply, a plurality of devices and a resistor array unit, wherein the communication network power supply, the plurality of devices and the resistor array unit are sequentially connected in parallel;
the resistor array unit comprises a fixed resistor R connected in parallel0And each resistance adjusting control unit is formed by connecting a field effect transistor and an adjusting resistor in series, the drain electrode of the field effect transistor is connected with one end of the corresponding adjusting resistor, the source electrode of the field effect transistor and the other end of the adjusting resistor are used as parallel ends, and the grid electrode of the field effect transistor is used as a signal input end of the resistor array unit.
The invention has novel and unique structure, simplicity and reasonableness, easy production, easy operation and low cost, and is convenient to use, good in effect and good in social and economic benefits.
Drawings
FIG. 1 is a schematic circuit diagram of a Profibus-DP communication loop.
Fig. 2 is a schematic circuit diagram of the present invention.
FIG. 3 is a schematic circuit diagram of a resistor array unit according to the present invention.
FIG. 4 is a diagram of a real-time voltage waveform of a Profibus-DP communication loop of a power plant original design, wherein the abscissa is time/. mu.s and the ordinate is voltage/V;
FIG. 5 is a graph of a real-time voltage waveform of a Profibus-DP communication loop of a power plant employing the adaptive dynamic tuning apparatus of the present invention, wherein the abscissa is time/. mu.s and the ordinate is voltage/V.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
As shown in fig. 1-3, the invention includes a communication network power supply, a plurality of devices and a resistor array unit, wherein the communication network power supply S, the plurality of devices and the resistor array unit are connected in parallel in sequence, a high-speed oscilloscope 1 is connected in parallel between the device closest to the resistor array unit and the resistor array unit, the output end of the high-speed oscilloscope 1 is connected with the positive input end of a comparator 4 through a first high-pass filter 2, the output end of the communication network power supply S is connected with the negative input end of the comparator 4 through a second high-pass filter 3, the output end of the comparator 4 is connected with the input end of a threshold comparator 5, the output end of the threshold comparator 5 is connected with the input end of a counter 6, and the output end of the counter 6 is connected with the input end of;
the high-speed oscilloscope 1 is used for acquiring the real-time voltage Vh of a communication loop;
the first high-pass filter 2 is used for high-pass filtering the acquired real-time voltage Vh and then sending the real-time voltage Vh to the anode of the comparator;
the second high-pass filter 3 is used for high-pass filtering a reference voltage Vref output by a reference acquired from a communication network power supply and then sending the reference voltage Vref to the negative electrode of the comparator; the high-pass filter is the prior art, and the high-pass filter allows normal high-frequency communication signals to pass through, and suppresses low-frequency or direct-current components;
the comparator 4 is used for comparing the high-pass filtered real-time voltage Vh with a reference voltage Vref and outputting a difference signal to the threshold comparator 5;
the threshold comparator 5 is configured to receive the difference signal output by the comparator 4, compare the difference signal with a preset threshold, and output a "0" or "1" signal according to a comparison result;
the counter 6 is used for receiving the signal output by the threshold comparator 5, inputting a clock rising edge or falling edge trigger pulse through the signal, driving the counter to count up or down, and generating a binary control signal to be output to the resistor array unit;
the resistor array unit is used for controlling the resistance value of a resistor accessed into the communication loop through a binary control signal sent by the counter, and the change of the resistance value of the resistor accessed into the communication loop enables the real-time voltage Vh to change, so that a negative feedback closed loop is formed, and the dynamic self-adaptive adjustment of the communication loop is realized;
when the communication loop works, a high-speed oscilloscope 1 is used for acquiring a real-time voltage Vh of the communication loop, the real-time voltage Vh is subjected to high-pass filtering by a first high-pass filter and then is sent to the anode of a comparator, a reference voltage Vref output from a reference acquired by a communication network power supply is subjected to high-pass filtering by a second high-pass filter and then is sent to the cathode of the comparator, a comparator 4 is used for comparing the high-pass filtered real-time voltage Vh with the reference voltage Vref and outputting a difference signal to a threshold comparator 5, the threshold comparator 5 is used for comparing the received difference signal with a preset threshold and outputting a signal of '0' or '1' to a counter according to a comparison result, the counter is used for inputting a clock rising edge or falling edge trigger pulse through the signal to drive the counter to count up or down and generate a binary control signal to be output to a resistor array unit, and the resistor array unit controls a resistor accessed into the communication loop through the binary And the resistance value of the resistor accessed into the communication loop changes to change the real-time voltage Vh, so that a negative feedback closed loop is formed, and the dynamic self-adaptive adjustment of the communication loop is realized.
In order to ensure the using effect, the resistor array unit comprises a fixed resistor R connected in parallel0And each resistance adjusting control unit is formed by connecting a field effect transistor and an adjusting resistor in series, the drain electrode of the field effect transistor is connected with one end of the corresponding adjusting resistor, the source electrode of the field effect transistor and the other end of the adjusting resistor are used as parallel ends, the grid electrode of the field effect transistor is used as a signal input end of the resistor array unit, and the fixed resistor R0The two ends of the resistor array are parallel ends of a communication loop, and the input end of the resistor array receives a binary control signal output by the counter, so that the field effect tube is driven to be switched on or switched off, the number of parallel resistors in the resistor array is controlled, the resistance value of the resistor array is increased or decreased, and the real-time voltage Vh is changed.
The resistor array unit comprises one resistor array unit connected in parallelFixed resistance R0And 3 resistance adjustment control units.
The 3 resistance regulation control units are respectively a first resistance regulation control unit, a second resistance regulation control unit and a third resistance regulation control unit;
wherein the first resistance regulation control unit comprises a field effect transistor Q connected in series1And adjusting the resistance R1(ii) a The second resistance regulation control unit comprises a field effect transistor Q connected in series2And adjusting the resistance R2(ii) a The third resistance regulation control unit comprises a field effect transistor Q connected in series3And adjusting the resistance R3(ii) a The input ends of the three resistance adjusting control units are respectively C1、C2And C3。
The grid of the field effect transistor is used as the signal input end of the resistor array unit, the binary control signal output by the counter is input into the resistor array unit through each input end, and the number of the resistors of the parallel circuit is controlled in a sequence mode until the resistance value of the resistor array is closest to the characteristic impedance of the transmission line. When the real-time voltage Vh > the reference voltage Vref and exceeds a threshold value set by the threshold comparator, an output signal of the threshold comparator is 1, the counter is driven to count up, the field effect tube is connected, the parallel resistor in the resistor array is increased, the resistance value of the resistor array is reduced, and the real-time voltage Vh is further reduced. The dynamic self-adaptive adjustment precision can be increased by increasing the number of the resistance adjustment control units.
Through practical application, the invention obtains expected technical effects, for example, after a certain power plant adopts the self-adaptive dynamic adjusting device in the capital construction period, compared with the originally designed communication loop, the invention can effectively reduce the signal reflection caused by the mismatching of the terminal resistance, and the waveform pair thereof has obvious improvement effect as shown in fig. 4 and 5. Therefore, the invention is characterized in that the high-speed oscilloscope is connected in parallel at a position close to the terminal resistor for acquiring the real-time voltage of the communication loop, the real-time voltage is compared with the reference voltage output by the reference to obtain a difference value, the resistance value of the resistor connected into the communication loop is controlled by comparing the difference value with the preset threshold value, so that a negative feedback closed loop is formed, the dynamic self-adaptive adjustment of the communication loop is realized, the communication quality and the transmission reliability of the Profibus-DP communication loop can be effectively improved, the structure is novel and unique, the invention is simple and reasonable, the production is easy, the operation is easy, the cost is low, the use is convenient, the effect is good.
Claims (3)
1. An adaptive dynamic tuning device for a communication loop, the adaptive dynamic tuning device comprising a communication network power supply, a plurality of devices, and a resistor array unit, the communication network power supply (S), the device comprises a plurality of devices and a resistor array unit which are sequentially connected in parallel, wherein a high-speed oscilloscope (1) is connected in parallel between the device closest to the resistor array unit and the resistor array unit, the output end of the high-speed oscilloscope (1) is connected with the positive input end of a comparator (4) through a first high-pass filter (2), the output end of a communication network power supply (S) is connected with the negative input end of the comparator (4) through a second high-pass filter (3), the output end of the comparator (4) is connected with the input end of a threshold comparator (5), the output end of the threshold comparator (5) is connected with the input end of a counter (6), and the output end of the counter (6) is connected with the input end of a matched resistor array unit.
2. The adaptive dynamic tuning device for communication loops of claim 1, wherein the resistor array unit comprises a fixed resistor R connected in parallel0And each resistance adjusting control unit is formed by connecting a field effect transistor and an adjusting resistor in series, the drain electrode of the field effect transistor is connected with one end of the corresponding adjusting resistor, the source electrode of the field effect transistor and the other end of the adjusting resistor are used as parallel ends, and the grid electrode of the field effect transistor is used as a signal of the resistor array unitAn input terminal.
3. The adaptive dynamic tuning device for communication loops of claim 2, wherein the resistor array unit comprises a fixed resistor R connected in parallel0And 3 resistance adjustment control units.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022369476.6U CN213072653U (en) | 2020-10-22 | 2020-10-22 | Adaptive dynamic adjustment device for communication loop |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022369476.6U CN213072653U (en) | 2020-10-22 | 2020-10-22 | Adaptive dynamic adjustment device for communication loop |
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| Publication Number | Publication Date |
|---|---|
| CN213072653U true CN213072653U (en) | 2021-04-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022369476.6U Expired - Fee Related CN213072653U (en) | 2020-10-22 | 2020-10-22 | Adaptive dynamic adjustment device for communication loop |
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2020
- 2020-10-22 CN CN202022369476.6U patent/CN213072653U/en not_active Expired - Fee Related
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Granted publication date: 20210427 |