CN112713914A - Test system of power line carrier communication equipment - Google Patents
Test system of power line carrier communication equipment Download PDFInfo
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- CN112713914A CN112713914A CN202011639714.9A CN202011639714A CN112713914A CN 112713914 A CN112713914 A CN 112713914A CN 202011639714 A CN202011639714 A CN 202011639714A CN 112713914 A CN112713914 A CN 112713914A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/46—Monitoring; Testing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
- H04B3/56—Circuits for coupling, blocking, or by-passing of signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2203/00—Indexing scheme relating to line transmission systems
- H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
- H04B2203/5462—Systems for power line communications
- H04B2203/5466—Systems for power line communications using three phases conductors
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2203/00—Indexing scheme relating to line transmission systems
- H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
- H04B2203/5462—Systems for power line communications
- H04B2203/5483—Systems for power line communications using coupling circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2203/00—Indexing scheme relating to line transmission systems
- H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
- H04B2203/5462—Systems for power line communications
- H04B2203/5491—Systems for power line communications using filtering and bypassing
Abstract
The embodiment of the invention relates to the technical field of communication test, and discloses a test system of power carrier communication equipment, which comprises a three-phase four-wire isolation filter, an isolation attenuation filter, a signal coupler and a two-way signal head end module which are sequentially connected, wherein the input end of the three-phase four-wire isolation filter is connected with a distribution box through a three-phase four-wire power line, and the two-way signal head end module can transmit communication radio-frequency signals to the power carrier communication equipment through the signal coupler so as to realize control and data communication of the power carrier communication equipment. And the cost is lower.
Description
Technical Field
The embodiment of the invention relates to the technical field of communication testing, in particular to a testing system of power line carrier communication equipment.
Background
With the development of Power line access and communication electronic technology, more and more devices communicate through Power line, Power Line Carrier (PLC) is a specific communication mode of a Power system, and Power line communication is a technology for transmitting analog or digital signals at a high speed through a Carrier mode by using an existing Power line. The method has the greatest characteristic that data transmission can be carried out only by wires without erecting a network again.
In implementing the embodiments of the present invention, the inventors found that at least the following problems exist in the above related art: because the power carrier communication equipment carries out signal transmission through the power line, the power supply and the communication among a plurality of pieces of equipment are easy to be interfered by signals because the power supply and the communication are all through the power line during research and development and production test. Particularly, performance testing is troublesome during production, a program-controlled variable-frequency and variable-voltage device is required to be arranged at each station in a good production environment, the existing production line needs to be updated, interference among the devices can be guaranteed unless the power supply system of the production line is completely isolated, and the factory needs to spend a large amount of time and expenditure to upgrade the production line and is high in cost.
Disclosure of Invention
In view of the foregoing defects in the prior art, an object of the embodiments of the present invention is to provide a test system for power line carrier communication devices with low cost, which can solve the problem of interference between power line carrier communication devices.
The purpose of the embodiment of the invention is realized by the following technical scheme:
in order to solve the above technical problem, an embodiment of the present invention provides a test system for testing a power line carrier communication device, where the test system is used for testing the power line carrier communication device, and includes:
one end of the three-phase four-wire power line is used for being connected to a distribution box;
the input end of the three-phase four-wire isolation filter is connected with the other end of the three-phase four-wire power line;
the input end of the isolation attenuation filter is connected with the output end of the three-phase four-wire isolation filter;
a signal coupler disposed between the isolation attenuation filter and the power carrier communication device;
and the double-path signal head end module is connected with the signal end of the signal coupler and used for transmitting a communication radio frequency signal to the power carrier communication equipment through the signal coupler so as to realize control and data communication of the power carrier communication equipment.
In some embodiments, the signal coupler and the two-way signal head-end module are connected by a coaxial cable.
In some embodiments, the test system further comprises:
an attenuator disposed between the signal coupler and the dual signal head end module.
In some embodiments, the test system further comprises:
and the power switch is arranged at the input end of the three-phase four-wire isolation filter.
In some embodiments, the power switch is an air switch.
In some embodiments, the power switch, the three-phase four-wire isolation filter, the isolation and attenuation filter, the signal coupler, the attenuator, and the two-way signal header module are all disposed within a hermetically sealed metal shield.
In some embodiments, the three-phase four-wire power line employs a three-phase four-wire power line having a length of 100 m.
In some embodiments, the cross-sectional area of the three-phase four-wire power line is 0.75mm or 1 mm.
In some embodiments, the isolation attenuation filter comprises:
four power lines connected between the three-phase four-wire isolation filter and the signal coupler, the four power lines including three live wires and one zero wire, wherein,
the four power lines are connected with two inductors in series, and each live wire is connected to the zero line through a capacitor.
In some embodiments, the number of the attenuators is two, the signal coupler includes two signal coupling circuits, each of the signal coupling circuits includes:
the signal coupling end is connected with the detection end of the double-path signal head end module through the attenuator;
and the input end of the transformer is connected with the signal coupling end through a series resistor, and the output end of the transformer is coupled to a high-voltage power line connected between the isolation attenuation filter and the power carrier communication equipment through a high-voltage capacitor.
Compared with the prior art, the invention has the beneficial effects that: different from the prior art, the embodiment of the invention provides a test system of power carrier communication equipment, which comprises a three-phase four-wire isolation filter, an isolation attenuation filter, a signal coupler and a two-way signal head end module which are sequentially connected, wherein the input end of the three-phase four-wire isolation filter is also connected to a distribution box through a three-phase four-wire power line, and the two-way signal head end module can transmit communication radio-frequency signals to the power carrier communication equipment through the signal coupler so as to realize control and data communication of the power carrier communication equipment. And the cost is lower.
Drawings
The embodiments are illustrated by the figures of the accompanying drawings which correspond and are not meant to limit the embodiments, in which elements/blocks having the same reference number designation may be represented by like elements/blocks, and in which the drawings are not to scale unless otherwise specified.
Fig. 1 is a schematic structural block diagram of a test system of a power line carrier communication device according to an embodiment of the present invention;
FIG. 2 is a schematic circuit diagram of an isolation attenuating filter in the test system of FIG. 1;
fig. 3 is a schematic circuit diagram of a signal coupler in the test system shown in fig. 1.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
It should be noted that, if not conflicted, the various features of the embodiments of the invention may be combined with each other within the scope of protection of the present application. In addition, although the functional blocks are divided in the device diagram, in some cases, the blocks may be divided differently from those in the device. It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present. In order to facilitate the definition of the connection structure, the position of the component is defined by taking the transmission direction of the power as a reference.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
When the performance of the power carrier communication equipment is required to be tested in production, the equipment is powered by a power line, and the power carrier communication is also powered by the power line. In order to solve the problem of interference between the existing power carrier communication devices, the embodiment of the invention provides a test system of the power carrier communication devices, which attenuates a power carrier signal through a three-phase four-wire isolation filter and an isolation attenuation filter, so that the problem of interference between the devices is solved, the production test of the power carrier communication devices is not influenced, the carrier signal of the test device is ensured not to be transmitted outwards through a power wire, and the cost is low.
Specifically, the embodiments of the present invention will be further explained below with reference to the drawings.
Example one
An embodiment of the present invention provides a test system for power line carrier communication equipment, please refer to fig. 1, which shows a block diagram of a test system for power line carrier communication equipment according to an embodiment of the present invention, where the test system 100 for power line carrier communication equipment includes: the test system 100 comprises a three-phase four-wire power line 110, a three-phase four-wire isolation filter 120, an isolation attenuation filter 130, a signal coupler 140 and a two-way signal head end module 150, and is used for testing the power carrier communication equipment 200. Wherein the content of the first and second substances,
the three-phase four-wire power line 110 has one end for connecting to the distribution box 300 and the other end connected to the three-phase four-wire isolation filter 120. Three-phase four-wire power line 110 adopts the long power line to insert, can utilize the power line to carry out power line carrier communication signal attenuation, and wherein, power line length can be adjusted through the test site interference condition, preferably, three-phase four-wire power line 110 adopts the three-phase four-wire power line that length is 100 m. In addition, the cross-sectional area of the three-phase four-wire power line 110 is also selected to be as small as possible in order to increase the attenuation of the carrier signal, and preferably, the cross-sectional area of the three-phase four-wire power line 110 is 0.75mm or 1 mm. By using the three-phase four-wire power line 110 having a long length and a small cross-sectional area as described above, the power line attenuation is increased, which is a low-cost method for further increasing the attenuation of the signal. Specifically, the length of the three-phase four-wire power line 110 and the cross-sectional area of the power line can be set according to actual needs, and need not be limited by the embodiments of the present invention.
The three-phase four-wire isolation filter 120 has an input connected to the other end 110 of the three-phase four-wire power line and an output connected to the input of the isolation attenuation filter. The three-phase four-wire isolation filter 120 functions to filter out external 0-30MHz interference signals from the power grid, and simultaneously attenuate power carrier signals transmitted by the two-way signal head end module 150 (test equipment) and the power carrier communication equipment 200 (tested equipment) in the test system. The three-phase four-wire isolation filter 120 may be a three-phase four-wire power filter commonly used in the market at present, such as an EMC/EMI filter, and is configured to effectively filter a frequency point of a specific frequency in a power line or frequencies other than the frequency point, to obtain a power signal of the specific frequency, or to eliminate the power signal of the specific frequency.
The isolation and attenuation filter 130 has an input connected to the output of the three-phase four-wire isolation filter 120 and an output connected to the signal coupler 140. Specifically, referring to fig. 2, a circuit structure of the isolation and attenuation filter 130 in the test system shown in fig. 1 is shown, where the isolation and attenuation filter 130 includes: connect three-phase four-wire isolation filter 120 with four way power LINE between signal coupler 140, four way power LINE includes three routes live wire LINE and a way zero LINE LN, wherein, four way power LINE all has concatenated two inductances, every way the live wire all is connected to through a electric capacity the zero LINE. Preferably, the inductor is an inductor with a model number of 220UH/0.5A, the capacitor is a capacitor with a model number of 0.33UF/440V, the inductor and the capacitor form a filter, and the power carrier signals transmitted by the two-way signal head end module 150 (test equipment) and the power carrier communication equipment 200 (tested equipment) in the test system are attenuated, and the attenuation amplitude can reach more than 40 dB. It should be noted that the design of the serially connected inductors needs to be disposed close to the signal coupler 140 (the capacitors are disposed close to the three-phase four-wire isolation filter 120), and the functions of the inductors and the capacitors can form a filter on one hand, and can isolate the power carrier signal on the other hand, so that the communication carrier amplitude between the power carrier communication device 200 (tested device) and the two-way signal head end module 150 (testing device) is not affected by the three-phase four-wire isolation filter 120. In an actual application environment, the number, the type and the like of the inductors and the capacitors can be set according to actual needs, and the limitation of the embodiment of the invention is not required.
The signal coupler 140 disposed between the isolation and attenuation filter 130 and the power carrier communication device 200; the signal coupler 140 and the dual-path signal head-end module 150 are connected by a coaxial cable. The signal coupler 140 is used for coupling the communication rf signal to the high voltage power line. Specifically, referring to fig. 3, a circuit structure of a signal coupler 140 in the test system shown in fig. 1 is shown, where the signal coupler 140 includes two signal coupling circuits 141 and 142, and each of the two signal coupling circuits 141 and 142 includes: signal coupling ends JT1 and JT2, connected to the detection end of the dual-path signal head end module 150 through the attenuator 160; the input ends of the transformers TN1 and TN3 are connected to the signal coupling ends JT1 and JT2 through series resistors, and the output ends are coupled to a high-voltage power line connected between the isolation and attenuation filter 130 and the power carrier communication device 200 through a high-voltage capacitor.
The dual-channel signal head module 150 is connected to the signal end of the signal coupler 140, and configured to transmit a communication radio frequency signal to the power carrier communication device 200 through the signal coupler 140, so as to implement control and data communication of the power carrier communication device 200.
Preferably, the series resistor has a resistance value of 1.2 ohms, the high-voltage capacitor has a model of 2.2nF/250V, and the communication radio-frequency signal transmitted by the two-way signal head end module 150 is coupled to the high-voltage power line through the transformer and the 2.2nF/250V high-voltage capacitor after passing through the 1.2 ohm series resistor. The embodiment of the invention adopts a two-way coupling design, and can meet a high-speed two-channel communication mode. In an actual application environment, the number, the type and the like of the series resistor and the high voltage can be set according to actual needs, and the limitation of the embodiment of the invention is not required.
Further, with continued reference to fig. 1, the test system 100 further includes: an attenuator 160 disposed between the signal coupler 140 and the dual signal head end module 150. The number of the attenuators 160 is two (160a and 160b), preferably, the attenuator 160 defaults to 20dB, and in an actual application environment, the attenuation amount can be increased or decreased according to an actual environment condition, and is not limited by the embodiment of the present invention.
Further, with continued reference to fig. 1, the test system 100 further includes: and a power switch 170 disposed at an input end of the three-phase four-wire isolation filter 120, wherein the power switch 170 is an air switch to ensure safe operation of the system and the equipment.
Further, since the strength of the signals transmitted by the dual-path signal head module 150 (test equipment) and the power carrier communication equipment 200 (device under test) can reach more than 15dBm, the power switch 170, the three-phase four-wire isolation filter 120, the isolation attenuation filter 130, the signal coupler 140, the attenuator 150, and the dual-path signal head module 160 all need to be disposed in a sealed metal shield, where the dashed box shown in fig. 1 represents the sealed metal shield.
The key point of the embodiment of the invention is power carrier signal attenuation and three-phase four-wire signal coupling, thereby solving the technical problems that the production line is not changed, the production test of the power carrier communication equipment is not influenced, the carrier signal of the test equipment is not transmitted outwards through the power line, and the mutual interference of a plurality of power communication equipment during the simultaneous test is avoided.
The embodiment of the invention provides a test system of power carrier communication equipment, which comprises a three-phase four-wire isolation filter, an isolation attenuation filter, a signal coupler and a two-way signal head end module which are sequentially connected, wherein the input end of the three-phase four-wire isolation filter is also connected into a distribution box through a three-phase four-wire power line, the two-way signal head end module can transmit communication radio-frequency signals to the power carrier communication equipment through the signal coupler, the test system provided by the embodiment of the invention attenuates the power carrier signal through the three-phase four-wire isolation filter and the isolation attenuation filter, solves the interference problem among the devices, therefore, the production test of the power carrier communication equipment is not influenced, the carrier signals of the test equipment are not transmitted outwards through the power line, and the cost is lower.
It should be noted that the above-described device embodiments are merely illustrative, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; within the idea of the invention, also technical features in the above embodiments or in different embodiments may be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A test system for testing a power line carrier, the test system comprising:
one end of the three-phase four-wire power line is used for being connected to a distribution box;
the input end of the three-phase four-wire isolation filter is connected with the other end of the three-phase four-wire power line;
the input end of the isolation attenuation filter is connected with the output end of the three-phase four-wire isolation filter;
a signal coupler disposed between the isolation attenuation filter and the power carrier communication device;
and the double-path signal head end module is connected with the signal end of the signal coupler and used for transmitting a communication radio frequency signal to the power carrier communication equipment through the signal coupler so as to realize control and data communication of the power carrier communication equipment.
2. The test system of claim 1,
the signal coupler is connected with the two-way signal head end module through a coaxial cable.
3. The test system of claim 2, further comprising:
an attenuator disposed between the signal coupler and the dual signal head end module.
4. The test system of claim 3, further comprising:
and the power switch is arranged at the input end of the three-phase four-wire isolation filter.
5. The test system of claim 4,
the power switch is an air switch.
6. The test system of claim 4,
the power switch, the three-phase four-wire isolation filter, the isolation attenuation filter, the signal coupler, the attenuator and the dual-path signal head end module are all arranged in the closed metal shielding cover.
7. The test system of claim 6,
the three-phase four-wire power line adopts a three-phase four-wire power line with the length of 100 m.
8. The test system of claim 7,
the sectional area of the three-phase four-wire power line is 0.75mm or 1 mm.
9. The test system of any one of claims 1-8, wherein the isolation attenuation filter comprises:
four power lines connected between the three-phase four-wire isolation filter and the signal coupler, the four power lines including three live wires and one zero wire, wherein,
the four power lines are connected with two inductors in series, and each live wire is connected to the zero line through a capacitor.
10. The test system according to any one of claims 3 to 8,
the number of the attenuators is two, the signal coupler comprises two paths of signal coupling circuits, and each path of the signal coupling circuits comprises:
the signal coupling end is connected with the detection end of the double-path signal head end module through the attenuator;
and the input end of the transformer is connected with the signal coupling end through a series resistor, and the output end of the transformer is coupled to a high-voltage power line connected between the isolation attenuation filter and the power carrier communication equipment through a high-voltage capacitor.
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| US20080315971A1 (en) * | 2007-06-21 | 2008-12-25 | Radtke William O | Power Line Data Signal Attenuation Device and Method |
| US20110053525A1 (en) * | 2009-09-01 | 2011-03-03 | Yi Jinsung | Coupling apparatus for dividing receiving and transmitting signals and control method thereof |
| WO2011139715A2 (en) * | 2010-04-26 | 2011-11-10 | Belkin International, Inc. | Electrical event detection device and method of detecting and classifying electrical power usage |
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