CN114421996B - Anti-attenuation test system of PLC signal - Google Patents
Anti-attenuation test system of PLC signal Download PDFInfo
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- CN114421996B CN114421996B CN202210310463.2A CN202210310463A CN114421996B CN 114421996 B CN114421996 B CN 114421996B CN 202210310463 A CN202210310463 A CN 202210310463A CN 114421996 B CN114421996 B CN 114421996B
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Abstract
The utility model discloses anti decay test system of PLC signal compares with prior art, includes: a three-phase purification circuit; the test subsystem is connected with the three-phase purification circuit; the test sub-system is arranged in parallel with the test sub-system and has the same structure; the test circuit is arranged between the test subsystem and the test accompanying subsystem; the test subsystem includes: one end of the first filtering module is connected with the three-phase purification circuit; the first isolation module is connected with the first filtering module; the first artificial power supply network module is arranged at the output end of the first isolation module; the PLC STA to be tested is connected with the first artificial power network module; and the second isolation module is arranged between the first artificial power supply network module and the STA to be tested of the PLC. Compared with the prior art, the technical scheme of the invention can effectively isolate signals, reduce the risk of network cross, has wide application range and can carry out anti-attenuation test without reducing the power of product equipment.
Description
Technical Field
The application relates to the field of PLC signal testing, in particular to a PLC signal attenuation resistance testing system.
Background
Power line communication, PLC for short, is a technology that utilizes the power line network carrier that has existed to carry out broadband communication, mainly through loading carrier signal transmission data on interchange or direct current circuit, and its advantage lies in need not additionally acting as go-between, just can transmit signal through the electric wire of family, does not have the poor problem of penetrability of wireless product yet. Since noise and noise on the power line of the transmission medium have uncertainty, it is necessary to test the transmission performance and the reception performance of the PLC power carrier product, which is also called an anti-fading test.
The attenuation resistance test aims at testing the maximum attenuation value which can be borne by PLC signal transmission, namely the maximum attenuation value which can be accessed by normal communication between a test product CCO and STA equipment, and is one of important indexes of a PLC product. Because the PLC does not have a standard comprehensive instrument like a WIFI product, the indexes of the product cannot be directly analyzed by the comprehensive instrument when the anti-attenuation performance of the product is evaluated. For the anti-attenuation test, as shown in fig. 6, the conventional scheme is: firstly, an isolator is used for creating a relatively interference-free testing environment, then a CCO for accompanying testing is added, the CCO is accessed into the testing environment through a connecting scheme of a coupler, an adjustable attenuator and the coupler, and STA equipment is directly accessed into the testing environment to test the maximum attenuation which can be added by the CCO and the STA. However, in such a scheme, when the power of the test product is too high, signals are coupled, so that the attenuator fails to work, a test result cannot be obtained, the power of the product needs to be reduced during testing, and then the compensation is performed after the testing is finished; however, for some PLC product test schemes that cannot reduce power or that cannot linearly correspond to dbm, the test cannot be performed, so that the maximum attenuation value cannot be obtained.
Therefore, it is an urgent technical problem for those skilled in the art to provide a PLC signal anti-attenuation testing system, which can effectively isolate signals, reduce the risk of occurrence of cross-talk and coupling, and has a wide application range, and can perform anti-attenuation testing without reducing the power of product equipment.
Disclosure of Invention
In order to solve the technical problem, the application provides a PLC signal anti-attenuation test system, which can effectively isolate signals, reduce the risk and coupling of the occurrence of series network, and has wide application range, and can perform anti-attenuation test without reducing the power of product equipment.
The first technical scheme provided by the application is as follows:
the application provides an anti decay test system of PLC signal includes: a three-phase purification circuit; the test subsystem is connected with the three-phase purification circuit;
the test subsystem includes: one end of the first filtering module is connected with the three-phase purification circuit; the first isolation module is connected with the first filtering module; the first artificial power supply network module is arranged at the output end of the first isolation module; the PLC STA to be tested is connected with the first artificial power network module; the second isolation module is arranged between the first manual power supply network module and the STA to be tested of the PLC;
the test subsystem is connected with the test subsystem in parallel;
the accompany measuring subsystem comprises: the second filtering module is connected with the three-phase purification circuit; the third isolation module is connected with the second filtering module; the second artificial power supply network module is arranged at the output end of the third isolation module; the PLC accompanied CCO is connected with the second artificial power network module; the fourth isolation module is arranged between the second artificial power supply network module and the PLC accompanying and measuring CCO;
and a test circuit connecting the second isolation module and the fourth isolation module; the test circuit is used for measuring the maximum attenuation value of PLC signal transmission.
Further, in a preferred mode of the present invention, the test circuit includes: one end of the impedance adjusting unit is connected with the second isolation module through a line; the adjustable signal attenuator is connected with the other end of the impedance adjusting unit; and a noise simulation unit connected to the adjustable signal attenuator; the noise simulation unit is connected with the fourth isolation module through a line.
Further, in a preferred mode of the present invention, the PLC signal attenuation preventing system further includes: one end of the first isolation module is connected with the first isolation module, and the other end of the first isolation module is connected with the signal measurement circuit of the third isolation module.
Further, in a preferred mode of the present invention, the signal measuring circuit includes: the spectrum analysis unit is connected with the first isolation module through a line; the digital oscillography unit is connected with the spectrum analysis unit; and the signal data acquisition unit is connected with the spectrum analysis unit and the digital oscillography unit.
Further, in a preferred aspect of the present invention, the PLC signal anti-attenuation test system further includes: and the control subsystem is connected with the test circuit.
Further, in a preferred mode of the present invention, the control subsystem includes: a main control module; the signal test management module is connected with the main control module and is used for controlling the operation of the attenuator, the adjustment of impedance and the simulation of noise; the signal measurement management module is connected with the signal data acquisition unit and is used for acquiring signal frequency spectrum and digital waveform data;
and the power control management module is connected with the main control module, the first artificial power network module and the second artificial power network module.
Further, in a preferred mode of the present invention, the signal test management module includes:
the attenuation range presetting unit is used for configuring an attenuation threshold value, and comprises a primary range presetting unit, a secondary range presetting unit, a tertiary range presetting unit and a quaternary range presetting unit, wherein the corresponding threshold values of the attenuation range presetting unit are respectively 10dB, 20dB, 40dB and 60 dB;
the attenuation adjusting unit is connected with the attenuation range presetting unit and the adjustable signal attenuator; the impedance grade presetting unit is connected with the impedance adjusting unit; and the noise level presetting unit is connected with the noise simulation unit and used for realizing noise interference of different degrees.
Further, in a preferred mode of the present invention, the first manual power supply network module includes: an input port connected to the first isolation module; the AC-DC voltage conversion unit is connected with the input port; the power supply control unit is connected with the alternating current-direct current voltage conversion unit and is connected with the control subsystem; the power supply display unit is connected with the power supply control unit;
a circuit decoupling unit disposed in parallel with the ac-dc voltage converting unit; the equipment access port is connected with the circuit decoupling unit and used for connecting the STA to be tested of the PLC; a common differential mode separation network unit connected with the circuit decoupling unit, the circuit coupling unit and the circuit decoupling unit; and the radio frequency output port is connected with the common-differential mode separation network unit and is connected with the second isolation module.
Further, in a preferred mode of the present invention, the first isolation module and the third isolation module are designed in the same structure; the second isolation module and the fourth isolation module are designed in the same structure.
Further, in a preferred mode of the present invention, the first isolation module and the third isolation module are specifically isolation transformers;
the second isolation module comprises: the electromagnetic shielding unit is connected with the first manual power supply network module; the directional coupling unit is connected with the electromagnetic shielding unit, is connected with the test circuit and transmits a coupling signal for testing; the electromagnetic shielding unit is used for providing a shielding environment for signal transmission.
Compared with the prior art, the PLC signal anti-attenuation test system provided by the invention comprises the following components: a three-phase purification circuit; the test subsystem is connected with the three-phase purification circuit; the test subsystem includes: one end of the first filtering module is connected with the three-phase purification circuit; the first isolation module is connected with the first filtering module; the first artificial power supply network module is arranged at the output end of the first isolation module; the PLC STA to be tested is connected with the first artificial power network module; the second isolation module is arranged between the first artificial power network module and the STA to be tested of the PLC; the test subsystem is connected with the test subsystem in parallel; the accompany measuring subsystem comprises: the second filtering module is connected with the three-phase purification circuit; the third isolation module is connected with the second filtering module; the second artificial power supply network module is arranged at the output end of the third isolation module; the PLC accompanying CCO is connected with the second artificial power network module; the fourth isolation module is arranged between the second artificial power network module and the PLC accompanying CCO; and a test circuit connecting the second isolation module and the fourth isolation module; the test circuit is used for measuring the maximum attenuation value of PLC signal transmission. The PLC signal anti-attenuation system provided by the invention has a main structure which is divided into six structures: firstly, the three-phase purification circuit is used for providing voltage input with low noise and less spike interference for testing; secondly, the test subsystem and the test accompanying subsystem have the same structure and are arranged in parallel and are connected with the three-phase purification circuit; in the structure, two layers of signal isolation processing mechanisms are configured: the first isolation module or the third isolation module is used for isolating an external network environment; the second isolation module or the fourth isolation module is used for performing electromagnetic shielding isolation on the PLC signal taken out from the artificial power network module, and effective signal isolation is ensured by two layers of isolation mechanisms; then, the test circuit is used, the STA to be tested by the PLC and the CCO for the PLC accompanying test are respectively and directly connected with the test subsystem and the accompanying test subsystem, the test circuit is directly utilized in the test process, the maximum attenuation value can be obtained, and other processing on the equipment to be tested is not needed; then, the signal measuring circuit is used for monitoring the change of the signal in real time so as to adjust the PLC signal for testing at any time; and finally, the control subsystems are adopted, the control subsystems are in communication connection with the subsystems, and the test process is regulated and controlled through signal instructions and system preset parameters. Compared with the prior art, the technical scheme of the invention can effectively isolate signals, reduce the risk of network cross, has wide application range and can carry out anti-attenuation test without reducing the power of product equipment.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic block diagram of a PLC signal anti-attenuation test system according to an embodiment of the present invention;
FIG. 2 is a block diagram schematically illustrating the structure of the test circuit according to an embodiment of the present invention;
fig. 3 is a schematic block diagram of the structure of the signal measurement circuit according to the embodiment of the present invention;
FIG. 4 is a block diagram schematically illustrating the structure of the control subsystem according to an embodiment of the present invention;
fig. 5 is a schematic block diagram of a structure of the first artificial power network module according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a conventional anti-fading test system according to an embodiment of the present invention.
Description of reference numerals:
a three-phase purification circuit 1; a test subsystem 2; a first filtering module 3; a first isolation module 4; a first artificial power network module 5; an input port 501; an ac-dc voltage conversion unit 502; a power supply control unit 503; a power supply display unit 504; a circuit decoupling unit 505; a device access port 506; a circuit coupling unit 507; a common-differential-mode separation network unit 508; a radio frequency output unit 509; a second isolation module 6; PLC STA to be tested 7; a test circuit 8; an impedance adjusting unit 801; an adjustable signal attenuator 802; a noise simulation unit 803; a cosmesis subsystem 9; a second filtering module 10; a third isolation module 11; a second artificial power network module 12; the PLC accompany CCO 13; a fourth isolation module 14; a signal measuring circuit 15; a spectrum analysis unit 1501; a digital scope unit 1502; a signal data acquisition unit 1503; a control subsystem 16; a main control module 1601; a signal test management module 1602; signal measurement management module 1603; a power control management module 1604; an attenuation range presetting unit 17; an attenuation adjusting unit 18; an impedance level presetting unit 19; a noise level presetting unit 20.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or be indirectly disposed on the other element; when an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "first," "second," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings that is solely for the purpose of facilitating the description and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "plurality" or "a plurality" means two or more unless specifically limited otherwise.
It should be understood that the structures, ratios, sizes, and the like shown in the drawings are only used for matching the disclosure of the present disclosure to be understood and read by those skilled in the art, and are not used for limiting the practical limitations of the present disclosure, so they do not have the essential technical meaning, and any modifications of the structures, changes of the ratio relationships, or adjustments of the sizes, should still fall within the scope of the technical disclosure of the present disclosure without affecting the function and the achievable purpose of the present disclosure.
As shown in fig. 1 to 6, the PLC signal anti-attenuation test system provided in the embodiment of the present application includes: a three-phase purification circuit 1; the test subsystem 2 is connected with the three-phase purification circuit 1; the test subsystem 2 comprises: one end of the first filtering module 3 is connected with the three-phase purification circuit 1; the first isolation module 4 is connected with the first filtering module 3; the first artificial power network module 5 is arranged at the output end of the first isolation module 4; the PLC STA7 to be tested is connected with the first artificial power network module 5; the second isolation module 6 is arranged between the first artificial power supply network module 5 and the PLC to-be-tested STA 7; the test subsystem 9 is connected with the test subsystem 2 in parallel; the accompanying subsystem 9 includes: a second filter module 10 connected to the three-phase purification circuit 1; a third isolation module 11 connected to the second filtering module 10; the second artificial power supply network module 12 is arranged at the output end of the third isolation module 11; a PLC attendant CCO13 connected to the second artificial power network module 12; the fourth isolation module 14 is arranged between the second artificial power supply network module 12 and the PLC accompanying CCO 13; and a test circuit 8 connecting the second isolation module 6 with the fourth isolation module 14; the test circuit 8 is used for measuring the maximum attenuation value of PLC signal transmission.
The invention provides a PLC signal anti-attenuation test system, which specifically comprises: a three-phase purification circuit 1; the test subsystem 2 is connected with the three-phase purification circuit 1; the test subsystem 2 comprises: one end of the first filtering module 3 is connected with the three-phase purification circuit 1; a first isolation module 4 connected to the first filtering module 3; the first artificial power supply network module 5 is arranged at the output end of the first isolation module 4; the PLC STA to be tested 7 is connected with the first manual power supply network module 5; the second isolation module 6 is arranged between the first manual power supply network module 5 and the PLC STA7 to be tested; the test subsystem 9 is connected with the test subsystem 2 in parallel; the test accompanying subsystem 9 comprises: the second filtering module 10 is connected with the three-phase purification circuit 1; a third isolation module 11 connected to the second filtering module 10; the second artificial power network module 12 is arranged at the output end of the third isolation module 11; a PLC attendant CCO13 connected to the second artificial power network module 12; a fourth isolation module 14 arranged between the second artificial power supply network module 12 and the PLC accompanied CCO 13; and a test circuit 8 connecting the second isolation module 6 with the fourth isolation module 14; the test circuit 8 is used for measuring the maximum attenuation value of PLC signal transmission. The PLC signal anti-attenuation system provided by the invention has a main framework which is divided into six structures: firstly, the three-phase purification circuit 1 is used for providing voltage input with low noise and less spike interference for testing; secondly, the test subsystem 2 and the test accompanying subsystem 9 have the same structure and are arranged in parallel and are connected with the three-phase purification circuit 1; in the structure, two layers of signal isolation processing mechanisms are configured: the first isolation module 4 or the third isolation module 11 is used for isolating an external network environment; the second isolation module 6 or the fourth isolation module 14 is used for performing electromagnetic shielding isolation on the PLC signal taken out from the artificial power network module, and effective signal isolation is ensured by two layers of isolation mechanisms; then, for the test circuit 8, the STA7 to be tested of the PLC and the PLC accompanying test CCO13 are directly connected to the test subsystem 2 and the accompanying test subsystem 9, respectively, and the maximum attenuation value can be obtained by directly using the test circuit 8 in the test process without performing other processing on the device to be tested; then, the signal measuring circuit 15 is used for monitoring the change of the signal in real time so as to adjust the PLC signal for testing at any time; and finally, the control subsystem 16 is in communication connection with each subsystem, and regulates and controls the test process through signal instructions and system preset parameters. Compared with the prior art, the technical scheme of the invention can effectively isolate signals, reduce the risk of network crossing, has wide application range and can carry out anti-attenuation test without reducing the power of product equipment.
Specifically, in the embodiment of the present invention, the test circuit 8 includes: an impedance adjusting unit 801 having one end connected to the second isolation module 6 through a line; an adjustable signal attenuator 802 connected to the other end of the impedance adjusting unit 801; and a noise simulation unit 803 connected to the adjustable signal attenuator 802; the noise simulation unit 803 is connected to the fourth isolation module 14 by a wire.
The test circuit 8 is arranged between the second isolation module 6 and the fourth isolation module 14; the artificial power supply network module supplies power to the equipment to be tested and takes out a PLC signal; the PLC signal enters the test circuit 8 for anti-attenuation test after being subjected to electromagnetic shielding and isolation treatment by the second isolation module 6. In the test circuit 8, the impedance adjusting unit 801 may be combined with the noise simulation unit 803 to adjust the test progress by adjusting the impedance and the noise interference, thereby obtaining the maximum attenuation value.
Specifically, in an embodiment of the present invention, the PLC signal anti-attenuation system further includes: one end of the first isolation module 4 is connected, and the other end of the first isolation module is connected with the signal measuring circuit 15 of the third isolation module 11.
Specifically, in the embodiment of the present invention, the signal measurement circuit 15 includes: a spectrum analysis unit 1501 connected to the first isolation module 4 through a line; a digital oscillography unit 1502 connected to the spectrum analysis unit 1501; and a signal data acquisition unit 1503 connected to the spectrum analysis unit 1501 and the digital oscillograph unit 1502.
In the embodiment of the invention, in order to obtain the change state of the PLC signal in real time and stabilize the PLC signal participating in the test, the signal measuring circuit 15 is arranged between the test subsystem 2 and the test-accompanying subsystem 9; the signal-measuring circuit 15 is arranged to measure,
specifically, in an embodiment of the present invention, the PLC signal anti-attenuation test system further includes: a control subsystem 16 connected to the test circuit 8.
Specifically, in an embodiment of the present invention, the control subsystem 16 includes: a main control module 1601; a signal test management module 1602 connected to the main control module 1601, wherein the signal test management module 1602 is configured to manage and control operation of the attenuator, adjustment of impedance, and simulation of noise; the signal measurement management module 1603 connected with the main control module 1601 is connected with the signal data acquisition unit 1503 to acquire signal frequency spectrum and digital waveform data; and a power control management module 1604 connecting the main control module 1601 with the first artificial power network module 5 and the second artificial power network module 12.
In the embodiment of the present invention, the control subsystem 16 is configured to control the operation of the whole test, including test channel simulation control, artificial power network control, signal change monitoring, data reading, and the like; in the control subsystem 16, the signal test management module 1602 is connected to the test circuit 8, and regulates and controls the operations of the impedance adjusting unit 801, the adjustable signal attenuator 802 and the noise simulation unit 803; the signal measurement management module 1603 is connected with a signal test circuit 8 and acquires frequency spectrum data and digital waveform data of a signal by interacting with the signal data acquisition unit 1503; in the embodiment, the three-phase purification circuit 1 is specifically composed of a three-phase purification power supply and a power transmission wire, and the power control management module 1604 is used for being connected to the three-phase purification power supply and an artificial power supply network, controlling the on/off of the three-phase purification power supply and the artificial power supply network, and controlling the operation of each unit module.
Specifically, in the embodiment of the present invention, the signal test management module 1602 includes:
the attenuation range presetting unit 17 is used for configuring an attenuation threshold, the attenuation range presetting unit 17 comprises a primary range presetting unit, a secondary range presetting unit, a tertiary range presetting unit and a quaternary range presetting unit, and the corresponding thresholds of the attenuation range presetting unit 17 are respectively 10dB, 20dB, 40dB and 60 dB;
an attenuation adjusting unit 18 connected to the attenuation range presetting unit 17 and the adjustable signal attenuator 802; an impedance level presetting unit 19 connected to the impedance adjusting unit 801; and a noise level presetting unit 20 connected to the noise simulation unit 803 for implementing different levels of noise interference.
In the embodiment of the present invention, for the test of the maximum attenuation value, in the control subsystem 16, a user can configure an attenuation value threshold value by the attenuation range presetting unit 17, divide the range by the threshold value, adjust the test attenuation value of each time by the attenuation adjusting unit 18, perform different attenuation value tests by combining the impedance registration presetting unit and the noise level presetting unit 20, and so on to obtain the maximum attenuation value.
Specifically, in the embodiment of the present invention, the first artificial power supply network module 5 includes: an input port 501 connected to the first isolation module 4; an ac-dc voltage conversion unit 502 connected to the input port 501; a power control unit 503 connected to the ac-dc voltage conversion unit 502, wherein the power control unit 503 is connected to the control subsystem 16; a power supply display unit 504 connected to the power supply control unit 503;
a circuit decoupling unit 505 provided in parallel with the ac-dc voltage conversion unit 502; a device access port 506 connected to the circuit decoupling unit 505, wherein the device access port 506 is used for connecting the STA7 to be tested of the PLC; a circuit coupling unit 507 is connected to the circuit decoupling unit 505; a common-differential mode separation network unit 508 connected to the circuit coupling unit 507; and a radio frequency output port connected to the common differential mode separation network unit 508, and the radio frequency output port is connected to the second isolation module 6.
In the embodiment of the present invention, the first artificial power network module 5 is configured to supply power to a device and couple out a PLC test signal; wherein, the input port 501 is connected to the three-phase purification network, provides input voltage, and then is divided into two branch structures:
an input port 501, an ac-dc voltage conversion unit 502, a power control unit 503, and a power display unit 504;
input port 501-circuit decoupling unit 505-device access port 506/(common mode separation network unit 508-radio frequency output unit 509-second isolation module 6);
the first branch structure is a control branch of a power supply, and the power supply control unit 503 is connected to the control subsystem 16 to regulate and control the operation thereof; the second branch structure is used for accessing the equipment to be tested and coupling out a PLC test signal; and the common-mode and differential-mode separation network unit 508 can be applied to diagnose the common-mode component and the differential-mode component, so that the artificial power network cannot provide tests of the common-mode and differential-mode components.
Specifically, in the embodiment of the present invention, the first isolation module 4 and the third isolation module 11 are designed in the same structure; the second isolation module 6 and the fourth isolation module 14 have the same structural design.
Specifically, in the embodiment of the present invention, the first isolation module 4 and the third isolation module 11 are specifically isolation transformers; the second isolation module 6 comprises: the electromagnetic shielding unit is connected with the first artificial power supply network module 5; the directional coupling unit is connected with the electromagnetic shielding unit, is connected with the test circuit 8 and transmits a coupling signal for testing; the electromagnetic shielding unit is used for providing a shielding environment for signal transmission.
Therefore, an embodiment of the present invention provides a PLC signal anti-attenuation test system, in which a main framework of the PLC signal anti-attenuation test system provided by the present invention is divided into six structures: firstly, the three-phase purification circuit 1 is used for providing voltage input with low noise and less spike interference for testing, and the three-phase purification circuit 1 is used for providing voltage input with low noise and less spike interference for testing; secondly, the test subsystem 2 and the test accompanying subsystem 9 have the same structure and are arranged in parallel and are connected with the three-phase purification circuit 1; in the structure, two layers of signal isolation processing mechanisms are configured: the first isolation module 4 or the third isolation module 11 is used for isolating an external network environment; the second isolation module 6 or the fourth isolation module 14 is used for performing electromagnetic shielding isolation on the PLC signal taken out from the artificial power network module, and effective signal isolation is ensured by two layers of isolation mechanisms; next, for the test circuit 8, the STA7 to be tested of the PLC and the PLC accompanying test CCO13 are directly connected to the test subsystem 2 and the accompanying test subsystem 9, respectively, and the maximum attenuation value can be obtained by directly using the test circuit 8 in the test process without performing other processing on the device to be tested; then, the signal measuring circuit 15 is used for monitoring the change of the signal in real time so as to adjust the PLC signal for testing at any time; and finally, the control subsystem 16 is in communication connection with each subsystem, and regulates and controls the test process through signal instructions and system preset parameters. Compared with the prior art, the technical scheme of the invention can effectively isolate signals, reduce the risk of network cross, has wide application range and can carry out anti-attenuation test without reducing the power of product equipment.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. A PLC signal anti-attenuation test system, comprising:
a three-phase purification circuit; the test subsystem is connected with the three-phase purification circuit;
the test subsystem includes: one end of the first filtering module is connected with the three-phase purification circuit; the first isolation module is connected with the first filtering module; the first artificial power supply network module is arranged at the output end of the first isolation module; the PLC STA to be tested is connected with the first manual power supply network module; the second isolation module is arranged between the first artificial power network module and the STA to be tested of the PLC;
the test subsystem is connected with the test subsystem in parallel;
the accompany measuring subsystem comprises: the second filtering module is connected with the three-phase purification circuit; the third isolation module is connected with the second filtering module; the second artificial power supply network module is arranged at the output end of the third isolation module; the PLC accompanied CCO is connected with the second artificial power network module; the fourth isolation module is arranged between the second artificial power network module and the PLC accompanying CCO;
and a test circuit connecting the second isolation module and the fourth isolation module; the test circuit is used for measuring the maximum attenuation value of PLC signal transmission;
the test circuit includes: one end of the impedance adjusting unit is connected with the second isolation module through a line; the adjustable signal attenuator is connected with the other end of the impedance adjusting unit; and a noise simulation unit connected to the adjustable signal attenuator; the noise simulation unit is connected with the fourth isolation module through a line;
the first isolation module and the third isolation module are designed in the same structure; the second isolation module and the fourth isolation module are designed in the same structure;
the first isolation module and the third isolation module are specifically isolation transformers;
the second isolation module includes: the electromagnetic shielding unit is connected with the first artificial power supply network module; the directional coupling unit is connected with the electromagnetic shielding unit, is connected with the test circuit and transmits a coupling signal for testing; the electromagnetic shielding unit is used for providing a shielding environment for signal transmission.
2. The PLC signal anti-attenuation test system of claim 1, further comprising: one end of the signal measuring circuit is connected with the first isolation module, and the other end of the signal measuring circuit is connected with the third isolation module.
3. The PLC signal anti-attenuation test system of claim 2, wherein the signal measurement circuit comprises: the spectrum analysis unit is connected with the first isolation module through a line; the digital oscillography unit is connected with the spectrum analysis unit; and the signal data acquisition unit is connected with the spectrum analysis unit and the digital oscillography unit.
4. The PLC signal anti-attenuation test system of claim 3, further comprising: and the control subsystem is connected with the test circuit.
5. The PLC signal anti-fade test system of claim 4, wherein the control subsystem comprises: a main control module; the signal test management module is connected with the main control module and is used for controlling the operation of the attenuator, the adjustment of impedance and the simulation of noise; the signal measurement management module is connected with the signal data acquisition unit and is used for acquiring signal frequency spectrum and digital waveform data;
and the power supply control management module is connected with the main control module, the first artificial power supply network module and the second artificial power supply network module.
6. The PLC signal anti-attenuation test system of claim 5, wherein the signal test management module comprises:
the attenuation range presetting unit is used for configuring an attenuation threshold value, and comprises a primary range presetting unit, a secondary range presetting unit, a tertiary range presetting unit and a quaternary range presetting unit, wherein the corresponding threshold values of the attenuation range presetting unit are respectively 10dB, 20dB, 40dB and 60 dB;
the attenuation adjusting unit is connected with the attenuation range presetting unit and the adjustable signal attenuator; the impedance grade presetting unit is connected with the impedance adjusting unit; and the noise level presetting unit is connected with the noise simulation unit and used for realizing noise interference of different degrees.
7. The PLC signal anti-attenuation test system of claim 5, wherein the first artificial power network module comprises: the input port is connected with the first filtering module; the AC-DC voltage conversion unit is connected with the input port; the power supply control unit is connected with the alternating current-direct current voltage conversion unit and is connected with the control subsystem; the power supply display unit is connected with the power supply control unit;
a circuit decoupling unit disposed in parallel with the ac-dc voltage converting unit; the equipment access port is connected with the circuit decoupling unit and used for connecting the STA to be tested of the PLC; a common differential mode separation network unit connected with the circuit decoupling unit, the circuit coupling unit and the circuit decoupling unit; and the radio frequency output port is connected with the common-differential mode separation network unit and is connected with the second isolation module.
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Denomination of invention: A PLC signal anti-attenuation test system Effective date of registration: 20220916 Granted publication date: 20220715 Pledgee: Bank of Changsha Limited by Share Ltd. Liuyang branch Pledgor: Ouzhitong Technology Co.,Ltd. Registration number: Y2022980015422 |