CN114944850A - Method and system for detecting receiving and transmitting capabilities of low-voltage power line carrier module - Google Patents
Method and system for detecting receiving and transmitting capabilities of low-voltage power line carrier module Download PDFInfo
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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
- H04B17/00—Monitoring; Testing
- H04B17/10—Monitoring; Testing of transmitters
- H04B17/15—Performance testing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/20—Monitoring; Testing of receivers
- H04B17/29—Performance 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
Abstract
The invention discloses a method and a system for detecting the receiving and transmitting capacity of a low-voltage power line carrier module, wherein the method comprises the following steps: a signal amplification circuit of the test equipment sends a beacon frame to a tested carrier module, and the tested carrier module sends a network access request frame to the test equipment based on the beacon frame; the test equipment carries out networking based on the received network access request frame, and sends a test excitation signal to the tested carrier module after adjusting the adjustable signal attenuation circuit to the maximum attenuation value; and a carrier receiving circuit of the test equipment receives a response signal of the tested carrier module responding to the test excitation signal, and judges the transmitting capacity of the tested carrier module based on the response signal.
Description
Technical Field
The invention relates to the technical field of power line carrier communication, in particular to a method and a system for detecting receiving and transmitting capacity of a low-voltage power line carrier module.
Background
With the gradual progress of the construction of the smart power grid, the low-voltage power line high-speed carrier communication is widely used for the power utilization information acquisition system, and the number of the electric energy meters installed at present is billion, and the number of the electric energy meters applying the high-speed carrier communication is more than half. With the increase of installation amount, a corresponding field operation and maintenance means is required to perform maintenance and detection on the carrier communication module. The sending and receiving performance of the carrier communication module is an important index for the operation of the module, if a problem occurs, the communication quality is seriously influenced, and the communication of the whole carrier network is influenced due to the networking characteristic of the high-speed carrier communication network. The conventional signal detection uses high sampling to analyze a large amount of data, and generally needs to be completed by means of instrument equipment.
The detection system proposed in the prior art (application number: 201310114497.5) low-voltage OFDM carrier physical layer communication performance detection system uses equipment such as a signal generator, a spectrum analyzer, a network analyzer, a channel simulator, a signal analyzer and the like to detect the communication performance of transmission and reception of a carrier communication module, and such detection needs to be carried out by using a special instrument or a test table body in a laboratory. Meanwhile, the existing field operation and maintenance equipment of the power line carrier communication module can only judge whether the carrier module can operate according to the received message information, and cannot detect the performance problems of carrier transmission and reception without further analyzing the power line carrier communication signals.
Therefore, a technique is needed to detect the receiving and transmitting capabilities of the low voltage power line carrier module.
Disclosure of Invention
The technical scheme of the invention provides a method and a system for detecting the receiving and transmitting capacity of a low-voltage power line carrier module, which aim to solve the problem of how to detect the receiving and transmitting capacity of the low-voltage power line carrier module.
In order to solve the above problem, the present invention provides a method for detecting the receiving and transmitting capabilities of a low voltage power line carrier module, wherein the method comprises:
a signal amplification circuit of the test equipment sends a beacon frame to a tested carrier module, and the tested carrier module sends a network access request frame to the test equipment based on the beacon frame;
the test equipment carries out networking based on the received network access request frame, and sends a test excitation signal to the tested carrier module after adjusting the adjustable signal attenuation circuit to the maximum attenuation value;
and the carrier receiving circuit of the test equipment receives a response signal of the tested carrier module responding to the test excitation signal, and the test equipment judges the transmitting capacity of the tested carrier module based on the response signal.
Preferably, the receiving a response signal of the tested carrier module to the test excitation signal is received by the carrier receiving circuit of the test device, and based on the response signal, the determining, by the test device, the transmitting capability of the tested carrier module includes:
the carrier receiving circuit of the test equipment comprises: the system comprises a carrier signal receiving filter, a receiving signal voltage division circuit, a receiving signal reduction circuit, a differential-to-single-ended and positive and negative peak value signal holding circuit;
the carrier signal receiving filter is connected with the received signal partial pressure;
the receiving signal voltage division and the receiving signal reduction are connected with the differential-to-single end;
the differential-to-single end is connected with the positive and negative peak signal holding circuit;
the carrier receiving circuit divides the response signals into three groups of signals, wherein the first signal is a normal receiving signal which is output by restoring the receiving signal, and the peak value of the response signal sent by the tested carrier module is judged through the normal receiving signal; the second signal is a positive peak signal output by the differential-to-single-ended and positive-negative peak signal holding circuit; the third signal is a negative peak signal output by the differential-to-single-ended and positive-negative peak signal holding circuit;
and judging the transmitting capacity of the tested carrier module based on the peak value of the response signal, the positive peak value signal and the negative peak value signal.
Preferably, the method further comprises the following steps:
holding the positive peak signal and the negative peak signal output by the differential-to-single-ended and positive-negative peak signal holding circuit as a positive peak signal P and a negative peak signal N;
collecting a positive peak voltage reference value V of the positive peak signal P in the absence of a carrier signal BP And a negative peak voltage reference value V of the negative peak signal N BN ；
When the sampling voltage V of the positive peak signal P P And the positive peak voltage reference value V BP Or when the sampled voltage V of the negative peak signal N N And the negative peak voltage reference value V BN Is greater than the carrier signal judgment threshold V E Then recording the sampling voltage V P And a sampling voltage V N ；
Will record the sampled voltage V P And a sampling voltage V N Recording every W sampling points as a sampling window, and calculating the average value of the W sampling voltages once to obtain the average value V of the sampling window after every W sampling voltages are obtained iP 、V iN Continuously recording the average value to obtain V 1P 、V 1N ……V iP 、V iN ；
If any one sampling average value V of M sampling windows iP 、V iN The value is lower than the corresponding signal effective threshold value or any one sampling average value V iN If the value is lower than the effective threshold value of the signal, the answer signal is judged to be noise or ineffective carrier signal, and the recorded sampling average value V is eliminated iP 、V iN ；
Average value V of samples of M sampling windows iP 、V iN Respectively higher than the corresponding effective threshold value of the signal, judging the response signal as an effective carrier signal, and continuously recording the sampling average value V of each sampling window iP 、V iN When the sampling average value V of continuous 3 sampling serial ports iP 、V iN Judging that the signal is finished when the value is lower than the signal effective threshold value; average value V of sampling voltage of all sampling windows to be recorded iP 、V iN The average value is calculated again to obtain the positive peak value sampling average value V of a frame of effective carrier signal Pout And negative peak sample average V Nout ；
According to the positive peak value sampling average value V of a frame of effective carrier signal Pout Negative peak sample mean V Nout Positive peak voltage reference value V BP Negative peak voltage reference value V BN Calculating the peak value V of the differential signal of the carrier signal pp ：
V pp =(V Pout -V BP )+(V Nout -V BN )
Calculating the positive peak signal V Pout -V BP With negative peak signal V Nout -V BN When the difference is larger than a preset threshold value, the response message is judged to be asymmetric.
Preferably, the value of M is determined by the shortest frame length T of the carrier signal, the sampling rate S and the number W of sampling points in the sampling window:
M=T / 2×S / W
preferably, the method further comprises the following steps:
and when the tested carrier module cannot respond to the test excitation signal and cannot receive a response signal of the tested carrier module responding to the test excitation signal through the test equipment, reducing the attenuation value of the adjustable signal attenuation circuit and then sending the test excitation signal to the tested carrier module.
Preferably, the method further comprises the following steps:
and when the attenuation value of the adjustable signal attenuation circuit is adjusted to be minimum and the tested carrier module still cannot respond to the test excitation signal, judging that the tested carrier module has a receiving fault.
Based on another aspect of the present invention, the present invention provides a system for detecting the receiving and transmitting capabilities of a low voltage power line carrier module, the system comprising: the device comprises a test device and a tested carrier module;
the test equipment is used for sending a beacon frame to the tested carrier module; networking based on the received network access request frame, adjusting the adjustable signal attenuation circuit to the maximum attenuation value, and then sending a test excitation signal to the tested carrier module; the response signal is used for receiving the response signal of the tested carrier module to the test excitation signal; judging the transmitting capacity of the tested carrier module based on the response signal;
the tested carrier module is used for sending a network access request frame to the test equipment based on the beacon frame; for generating a reply signal in response to said test stimulus signal.
Preferably, the first and second electrodes are formed of a metal,
the carrier receiving circuit of the test equipment comprises: the system comprises a carrier signal receiving filter, a receiving signal voltage division circuit, a receiving signal reduction circuit, a differential-to-single-ended and positive and negative peak value signal holding circuit;
the carrier signal receiving filter is connected with the received signal partial pressure;
the receiving signal voltage division and the receiving signal reduction are connected with the differential-to-single end;
the differential-to-single end is connected with the positive and negative peak signal holding circuit;
the carrier receiving circuit is used for dividing the response signals into three groups of signals, wherein the first signal is a normal receiving signal which is output by restoring the receiving signal, and the peak value of the response signal sent by the tested carrier module is judged according to the normal receiving signal; the second signal is a positive peak signal output by the differential-to-single-ended and positive-negative peak signal holding circuit; the third signal is a negative peak signal output by the differential-to-single-ended and positive-negative peak signal holding circuit;
and judging the transmitting capacity of the tested carrier module based on the peak value of the response signal, the positive peak value signal and the negative peak value signal.
Preferably, the test device is further configured to:
holding the positive peak signal and the negative peak signal output by the differential-to-single-ended and positive-negative peak signal holding circuit as a positive peak signal P and a negative peak signal N;
collecting a positive peak voltage reference value V of the positive peak signal P in the absence of a carrier signal BP And a negative peak voltage reference value V of the negative peak signal N BN ；
When the sampling voltage V of the positive peak signal P P And the positive peak voltage reference value V BP Or when the sampled voltage V of the negative peak signal N N And the negative peak voltage reference value V BN Is greater than the carrier signal judgment threshold V E Then recording the sampling voltage V P And a sampling voltage V N ；
Will record the sampled voltage V P And a sampling voltage V N Marking every W sampling points as a sampling window, and after every W sampling voltages are obtained, carrying out average calculation on the W sampling voltages to obtain the average value V of the sampling window iP 、V iN Continuously recording the average value to obtain V 1P 、V 1N ……V iP 、V iN ；
If any one sampling average value V of M sampling windows iP 、V iN The value is lower than the corresponding signal effective threshold value or any one sampling average value V iN If the value is lower than the effective threshold value of the signal, the answer signal is judged to be noise or ineffective carrier signal, and the recorded sampling average value V is eliminated iP 、V iN ；
Average value V of samples of M sampling windows iP 、V iN Respectively higher than the corresponding effective threshold value of the signal, judging the response signal as an effective carrier signal, and continuously recording the sampling average value V of each sampling window iP 、V iN When the sampling average value V of continuous 3 sampling serial ports iP 、V iN Judging that the signal is finished when the value is lower than the signal effective threshold value; average value V of sampling voltage of all sampling windows to be recorded iP 、V iN The average value is calculated again to obtain the positive peak value sampling average value V of a frame of effective carrier signal Pout And negative peak sample average V Nout ；
According to the positive peak value sampling average value V of a frame of effective carrier signal Pout Negative peak sample average V Nout Positive peak voltage reference value V BP Negative peak voltage reference value V BN Calculating the peak value V of the differential signal of the carrier signal pp ：
V pp =(V Pout -V BP )+(V Nout -V BN )
Calculating the positive peak signal V Pout -V BP With negative peak signal V Nout -V BN When the difference is larger than a preset threshold value, the response message is judged to be asymmetric.
Preferably, the value of M is determined by the shortest frame length T of the carrier signal, the sampling rate S and the number W of sampling points in the sampling window:
M=T / 2×S / W
preferably, the test apparatus is further configured to:
and when the tested carrier module cannot respond to the test excitation signal and cannot receive a response signal of the tested carrier module responding to the test excitation signal through the test equipment, reducing the attenuation value of the adjustable signal attenuation circuit and then sending the test excitation signal to the tested carrier module.
Preferably, the test apparatus is further configured to:
and when the attenuation value of the adjustable signal attenuation circuit is adjusted to be minimum and the tested carrier module still cannot respond to the test excitation signal, judging that the tested carrier module has a receiving fault.
The technical scheme of the invention provides a method and a system for detecting the receiving and transmitting capacity of a low-voltage power line carrier module, wherein the method comprises the following steps: a signal amplification circuit of the test equipment sends a beacon frame to a tested carrier module, and the tested carrier module sends a network access request frame to the test equipment based on the beacon frame; the test equipment carries out networking based on the received network access request frame, and sends a test excitation signal to the tested carrier module after adjusting the adjustable signal attenuation circuit to the maximum attenuation value; and a carrier receiving circuit of the test equipment receives a response signal of the tested carrier module responding to the test excitation signal, and judges the transmitting capacity of the tested carrier module based on the response signal. The method and the system for detecting the receiving and transmitting capacity of the low-voltage power line carrier module, provided by the technical scheme of the invention, are suitable for rapidly detecting and judging the transmitting and receiving capacity of the module on site and serve for the on-site operation and maintenance of a power grid power line carrier communication system.
Drawings
A more complete understanding of exemplary embodiments of the present invention may be had by reference to the following drawings in which:
fig. 1 is a flowchart of a method for detecting the receiving and transmitting capabilities of a low voltage power line carrier module according to a preferred embodiment of the present invention;
FIG. 2 is a schematic circuit diagram of the overall circuit of the test equipment and the tested carrier module according to the preferred embodiment of the invention;
FIG. 3 is a schematic diagram illustrating a signal interaction process of a method for transmitting and receiving signals by a detection module according to a preferred embodiment of the present invention;
FIG. 4 is a schematic circuit diagram of a received signal voltage dividing, received signal amplifying and restoring portion according to a preferred embodiment of the present invention;
FIG. 5 is a circuit diagram of a differential to single ended and peak signal hold portion according to a preferred embodiment of the present invention; and
fig. 6 is a structural diagram of a system for detecting the receiving and transmitting capabilities of a low voltage power line carrier module according to a preferred embodiment of the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terms used in the exemplary embodiments shown in the drawings are not intended to limit the present invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including 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. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Fig. 1 is a flowchart of a method for detecting the receiving and transmitting capabilities of a low voltage power line carrier module according to a preferred embodiment of the present invention. The embodiment of the invention aims to solve the defects of more sampling data and large calculated amount of the existing communication module transceiving detection method, the device based on high-speed sampling and data calculation has high cost and cannot be used in a portable mode, and the existing measurement method cannot verify the asymmetric abnormality of a differential transmitting circuit.
The invention provides a detection circuit and a method for receiving and transmitting capacity of a low-voltage power line carrier module, wherein the communication system comprises the carrier module based on a low-voltage power line high-speed carrier communication system, and the detection circuit comprises: the test equipment is provided with a carrier sending circuit and a carrier receiving circuit, wherein the carrier sending circuit comprises a path of signal amplifying circuit and a path of adjustable signal attenuation circuit, and the carrier receiving circuit comprises a path of differential peak detection circuit and a path of receiving signal amplifying and restoring circuit.
As shown in fig. 1, the present invention provides a method for detecting the receiving and transmitting capabilities of a low voltage power line carrier module, the method comprising:
step 101: a signal amplification circuit of the test equipment sends a beacon frame to a tested carrier module, and the tested carrier module sends a network access request frame to the test equipment based on the beacon frame;
after the test equipment is connected with a tested carrier module, a beacon frame is sent by a sending channel control signal selection signal amplifying circuit; and after receiving the beacon frame, the tested carrier module sends a network access request to complete the networking process.
Step 102: the test equipment carries out networking based on the received network access request frame, and sends a test excitation signal to the tested carrier module after adjusting the adjustable signal attenuation circuit to the maximum attenuation value;
after receiving a network access request frame of a carrier module to be tested and confirming networking, the testing equipment selects the adjustable attenuation circuit to send a testing excitation signal by sending a channel control signal and sets the attenuation circuit as a maximum attenuation value; and after receiving the test excitation signal, the tested carrier module sends a response signal.
Step 103: and the carrier receiving circuit of the test equipment receives a response signal of the tested carrier module responding to the test excitation signal, and the test equipment judges the transmitting capacity of the tested carrier module based on the response signal.
The test equipment receives the response signal sent by the tested carrier module through the received signal amplifying and restoring circuit and judges the data content of the received response signal; meanwhile, the positive and negative peak values of the response signal of the tested carrier module are detected through a differential peak value detection circuit, and the strength and symmetry of the signal sent by the tested carrier module are judged; because there is processing time for normally receiving the reply signal, the signal peak value detected in a time range before normally receiving the reply signal is a valid signal peak value.
Preferably, the method further comprises the following steps:
when the tested carrier module cannot respond to the test excitation signal and cannot receive a response signal of the tested carrier module responding to the test excitation signal through the test equipment, the attenuation value of the adjustable signal attenuation circuit is reduced and then the test excitation signal is sent to the tested carrier module.
Preferably, the method further comprises the following steps:
and when the attenuation value of the adjustable signal attenuation circuit is adjusted to be minimum and the tested carrier module still cannot respond to the test excitation signal, judging that the tested carrier module has a receiving fault.
In the invention, if the test equipment can not normally receive the response signal sent by the tested carrier module, the operation of the steps 102 to 103 is repeated until the response signal sent by the tested carrier module can be obtained by reducing the adjustable attenuation step by step, and if the response signal sent by the tested carrier module can not be received when the attenuation is minimum, the receiving fault of the tested carrier module is judged; if the test equipment can normally receive the response signal sent by the tested carrier module, the step 102 is repeated for increasing the adjustable attenuation step by step, the process from the step 102 to the step 104 is repeated to ensure the accuracy of the test data, the peak value result of the signal sent by the tested carrier module is obtained, and the receiving capability result of the tested carrier module is obtained according to the attenuation value of the current adjustable signal attenuation circuit.
The carrier sending circuit comprises a signal amplifying circuit and an adjustable signal attenuation circuit, and the signal intensity of the excitation signal sent by the amplifying circuit or sent by the adjustable attenuation circuit is selected by a sending channel control signal; because the carrier communication test needs to be completed under the networking condition, the amplification circuit is used for sending the beacon frame in the test preparation stage, namely the networking process, so that the tested carrier module can be quickly networked, the adjustable attenuation circuit is used for sending the excitation signal in the signal peak value detection process, the receiving capacity of the tested carrier module is tested, and meanwhile, the interference of the test excitation signal sent by the test equipment on peak value detection when the tested carrier module sends the signal is also avoided. As shown in fig. 2.
Preferably, the receiving a response signal of the tested carrier module to the test excitation signal by the carrier receiving circuit of the test device, and determining the transmitting capability of the tested carrier module based on the response signal includes:
the carrier receiving circuit of the test apparatus includes: the device comprises a carrier signal receiving filter, a received signal voltage division circuit, a received signal reduction circuit, a differential-to-single-ended and positive-negative peak signal holding circuit;
the carrier signal receiving filter is connected with the received signal partial pressure;
receiving signal voltage division, receiving signal reduction and differential-to-single end connection;
the differential-to-single-ended circuit is connected with the positive and negative peak signal holding circuit;
the carrier receiving circuit divides the response signals into three groups of signals, wherein the first signal is a normal receiving signal which is output by restoring the receiving signal, and the peak value of the response signal sent by the tested carrier module is judged through the normal receiving signal; the second signal is a positive peak signal output by the differential-to-single-ended and positive-negative peak signal holding circuit; the third signal is a negative peak signal output by the differential-to-single-ended and positive-negative peak signal holding circuit;
and judging the transmitting capacity of the tested carrier module based on the peak value of the response signal, the positive peak value signal and the negative peak value signal. As shown in fig. 3.
The carrier receiving circuit of the invention comprises a differential peak value detection circuit and a receiving signal restoring circuit, which comprises: carrier signal receiving filter, received signal partial pressure, received signal restore, difference change single-ended and positive negative peak value signal holding circuit, wherein: the carrier signal receiving filter is connected with a received signal partial pressure, the received signal partial pressure is connected with a received signal reduction and differential to single-ended conversion, and the differential to single-ended conversion is connected with a positive and negative peak value signal holding circuit; finally, three groups of signals are obtained, wherein the signal 1 is a normal receiving signal which is restored and output through the receiving signal, the peak value of a signal sent by a tested carrier module is ensured to be detected under the condition that the signal can be normally received, the signal 2 is a positive peak value signal which is output after the signal passes through a differential-to-single-ended circuit and a positive peak value signal is kept, and the signal 3 is a negative peak value signal which is output after the signal passes through the differential-to-single-ended circuit and a negative peak value signal is kept; the differential signal converted into the single-ended output signal is divided into two paths, two diodes are respectively used for connecting a positive end and a negative end of the single-ended signal output, namely positive half-wave signals and negative half-wave signals are respectively extracted, and then the positive peak value signal and the negative peak value signal are respectively kept through a peak value keeping circuit realized by low-pass filtering; sampling and measuring the positive and negative peak signals, and calculating the transmitting capacity of the carrier module to be measured according to the measurement result; meanwhile, whether the positive and negative circuits of the emission of the carrier module to be tested are symmetrical is judged by comparing the positive and negative peak values.
Preferably, the method further comprises the following steps:
the positive peak value signal and the negative peak value signal output by the differential-to-single-ended and positive-negative peak value signal holding circuit are held as a positive peak value signal P and a negative peak value signal N;
acquiring a positive peak voltage reference value V of a positive peak signal P in the absence of a carrier signal BP And a negative peak voltage reference value V of the negative peak signal N BN ；
When the sampling voltage V of the positive peak signal P P And a positive peak voltage reference value V BP Or as a sampled voltage V of the negative peak signal N N And a negative peak voltage reference value V BN Is greater than the carrier signal judgment threshold V E Then recording the sampling voltage V P And a sampling voltage V N ；
At the recording of the sampling voltage V P And a sampling voltage V N Recording every W sampling points as a sampling window, and calculating the average value of the W sampling voltages once to obtain the average value V of the sampling window after every W sampling voltages are obtained iP 、V iN Continuously recording the average value to obtain V 1P 、V 1N ……V iP 、V iN ；
If any one sampling average value V of M sampling windows iP 、V iN The value is lower than the corresponding signal effective threshold value or any one sampling average value V iN If the value is lower than the effective threshold value of the signal, the answer signal is judged to be noise or ineffective carrier signal, and the recorded sampling average value V is eliminated iP 、V iN ；
Average value V of samples of M sampling windows iP 、V iN Respectively higher than the corresponding effective threshold value of the signal, judging the response signal as an effective carrier signal, and continuously recording the sampling average value V of each sampling window iP 、V iN When the sampling average value V of continuous 3 sampling serial ports iP 、V iN Judging that the signal is finished when the value is lower than the signal effective threshold value; average value V of sampling voltage of all sampling windows to be recorded iP 、V iN The average value is calculated again to obtain the positive peak value sampling average value V of a frame of effective carrier signal Pout And negative peak sample average V Nout ；
According to the positive peak value sampling average value V of a frame of effective carrier signal Pout Negative peak sample average V Nout Positive peak voltage reference value V BP Negative peak voltage reference value V BN Calculating the peak value V of the differential signal of the carrier signal pp ：
V pp =(V Pout -V BP )+(V Nout -V BN )
Calculating the positive peak signal V Pout -V BP And negative peak signal V Nout -V BN When the difference is larger than the preset threshold, the response information is judged to be asymmetric.
Preferably, the value of M is determined by the shortest frame length T of the carrier signal, the sampling rate S and the number W of sampling points in the sampling window:
M=T / 2×S / W
the test equipment of the invention detects the positive and negative peak values of the response signal of the tested carrier module through the differential peak value detection circuit, and the specific method is as follows:
(1) converting the single-ended signal and the signal after positive and negative peak value holding of the differential signal into a signal P and a signal N;
(2) the sampling circuit samples the positive peak value signal P and the negative peak value signal N at a sampling rate S, and collects voltage basic values VBP and VBN when no carrier signal exists as the reference of a judgment signal;
(3) when the difference (VP-VBP) between the sampling voltage VP of the current positive peak signal P and the voltage base value VBP or the difference (VP-VBN) between the sampling voltage VN of the negative peak signal N and the voltage base value VBN is larger than the set carrier signal judgment threshold VE, recording sampling point voltages V0P and V0N;
(4) recording every W sampling points after V0P and V0N as a sampling window, carrying out average calculation on the W sampling voltages once after every W sampling voltages are obtained to obtain sampling window average values ViP and ViN, and continuously recording the average values to obtain V1P, V1N … … ViP and ViN.
(5) If any one of the sampling average values ViP and ViN in the M sampling windows is lower than a signal effective threshold value (VBP + VE), or any one of the sampling average values ViN is lower than the signal effective threshold value (VBN + VE), the sampling average values ViP and ViN are judged to be noise or non-effective carrier signals, the previously recorded sampling average values ViP and ViN are eliminated, and the value of M is determined by the shortest frame length T of the carrier signals, the sampling rate S and the number W of sampling window sampling points:
M=T / 2×S / W
(6) if the average values ViP and ViN of the M sampling windows are respectively higher than the effective threshold values VEP and VEN of the signals, judging the signals to be effective carrier signals, continuously recording the sampling average values ViP and ViN of each sampling window, judging the signals to be finished when the values of the sampling average values ViP and ViN of continuous 3 sampling serial ports are lower than the effective threshold values VEP and VEN of the signals, and performing average value calculation on the recorded sampling voltage average values ViP and ViN of all the sampling windows again to obtain the positive peak value sampling average value VPout and the negative peak value sampling average value VNout of the effective carrier signals of one frame;
(7) calculating the peak-to-peak value Vpp of the carrier signal differential signal according to the positive and negative peak sampling average values VPout and VNout and the voltage base values VBP and VBN of the effective carrier signal of one frame:
Vpp=(VPout-VBP)+(VNout-VBN)
(8) comparing the positive and negative peak signals VPout-VBP and VNout-VBN, and judging that the positive and negative peak signals are asymmetrical in positive and negative if the difference between the positive and negative peak signals is more than 20%.
The circuit and the method for detecting the receiving and transmitting capacities of the low-voltage power line carrier module can realize the receiving and transmitting capacities detection of the carrier signal on the handheld operation and maintenance equipment, provide possibility for detecting the receiving and transmitting performances of the carrier module on site, improve the detection convenience and reduce the detection cost. The invention uses the excitation signal with adjustable attenuation when the test carrier signal is sent, can test the receiving capability of the tested carrier module, also avoids the interference of the test excitation signal to the test, and respectively detects the positive peak value and the negative peak value of two paths of the differential signal, thereby improving the accuracy of the test. The invention detects the receiving and sending capabilities of the carrier module while testing the basic communication process, and tests the sending capabilities while testing the receiving capabilities, thereby effectively utilizing the detection time and greatly improving the field operation efficiency.
Fig. 6 is a structural diagram of a system for detecting the receiving and transmitting capabilities of a low voltage power line carrier module according to a preferred embodiment of the present invention. As shown in fig. 6, the present invention provides a system for detecting the receiving and transmitting capabilities of a low voltage power line carrier module, the system comprising: the test device 601 and the tested carrier module 602;
the test equipment 601 is used for sending a beacon frame to the tested carrier module; networking based on the received network access request frame, adjusting the adjustable signal attenuation circuit to the maximum attenuation value, and then sending a test excitation signal to the tested carrier module; the response signal is used for receiving the response signal of the tested carrier module to the test excitation signal; judging the transmitting capacity of the tested carrier module based on the response signal;
the tested carrier module 602 is configured to send a network access request frame to the test device based on the beacon frame; for generating a response signal in response to said test stimulus signal.
Preferably, the first and second electrodes are formed of a metal,
the carrier receiving circuit of the test device includes: the device comprises a carrier signal receiving filter, a received signal voltage division circuit, a received signal reduction circuit, a differential-to-single-ended and positive-negative peak signal holding circuit;
the carrier signal receiving filter is connected with the received signal partial pressure;
receiving signal voltage division, receiving signal reduction and differential-to-single end connection;
the differential-to-single-ended circuit is connected with the positive and negative peak signal holding circuit;
the carrier receiving circuit is used for dividing the response signals into three groups of signals, wherein the first signal is a normal receiving signal which is output by restoring the receiving signal, and the peak value of the response signal sent by the tested carrier module is judged through the normal receiving signal; the second signal is a positive peak signal output by the differential-to-single-ended and positive-negative peak signal holding circuit; the third signal is a negative peak signal output by the differential-to-single-ended and positive-negative peak signal holding circuit;
and judging the transmitting capacity of the tested carrier module based on the peak value of the response signal, the positive peak value signal and the negative peak value signal.
Preferably, the testing device 601 is further configured to:
the positive peak value signal and the negative peak value signal output by the differential-to-single-ended and positive-negative peak value signal holding circuit are held as a positive peak value signal P and a negative peak value signal N;
acquiring a positive peak voltage reference value V of a positive peak signal P in the absence of a carrier signal BP And a negative peak voltage reference value V of the negative peak signal N BN ；
When the sampling voltage V of the positive peak signal P P And a positive peak voltage reference value V BP Or as a sampled voltage V of the negative peak signal N N And a negative peak voltage reference value V BN Is greater than the carrier signal judgment threshold V E Then record the samplingVoltage V P And a sampling voltage V N ；
At the time of recording the sampling voltage V P And a sampling voltage V N Recording every W sampling points as a sampling window, and calculating the average value of the W sampling voltages once to obtain the average value V of the sampling window after every W sampling voltages are obtained iP 、V iN Continuously recording the average value to obtain V 1P 、V 1N ……V iP 、V iN ；
If any one sampling average value V of M sampling windows iP 、V iN The value is lower than the corresponding signal effective threshold value or any one sampling average value V iN If the value is lower than the effective threshold value of the signal, the answer signal is judged to be noise or ineffective carrier signal, and the recorded sampling average value V is eliminated iP 、V iN ；
Average value V of samples of M sampling windows iP 、V iN Respectively higher than the corresponding effective threshold value of the signal, judging the response signal as an effective carrier signal, and continuously recording the sampling average value V of each sampling window iP 、V iN When the sampling average value V of continuous 3 sampling serial ports iP 、V iN Judging that the signal is finished when the value is lower than the signal effective threshold value; average value V of sampling voltage of all sampling windows to be recorded iP 、V iN The average value is calculated again to obtain the positive peak value sampling average value V of a frame of effective carrier signal Pout And negative peak sample average V Nout ；
According to the positive peak value sampling average value V of a frame of effective carrier signal Pout Negative peak sample average V Nout Positive peak voltage reference value V BP Negative peak voltage reference value V BN Calculating the peak value V of the differential signal of the carrier signal pp ：
V pp =(V Pout -V BP )+(V Nout -V BN )
Calculating the positive peak signal V Pout -V BP With negative peak signal V Nout -V BN When the difference is larger than the preset threshold, the response information is judged to be asymmetric.
Preferably, the value of M is determined by the shortest frame length T of the carrier signal, the sampling rate S and the number W of sampling points in the sampling window:
M=T / 2×S / W
preferably, the testing device 601 is further configured to:
when the tested carrier module cannot respond to the test excitation signal and cannot receive a response signal of the tested carrier module responding to the test excitation signal through the test equipment, the attenuation value of the adjustable signal attenuation circuit is reduced and then the test excitation signal is sent to the tested carrier module.
Preferably, the testing device 601 is further configured to:
when the attenuation value of the adjustable signal attenuation circuit is adjusted to be minimum, and the tested carrier module still cannot respond to the test excitation signal, judging that the tested carrier module has a receiving fault.
A system 600 for detecting the receiving and transmitting capabilities of a low-voltage power line carrier module according to the preferred embodiment of the present invention corresponds to the method 100 for detecting the receiving and transmitting capabilities of a low-voltage power line carrier module according to the preferred embodiment of the present invention, and will not be described herein again.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein. The scheme in the embodiment of the invention can be realized by adopting various computer languages, such as object-oriented programming language Java and transliterated scripting language JavaScript.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
The invention has been described with reference to a few embodiments. However, other embodiments of the invention than the one disclosed above are equally possible within the scope of the invention, as would be apparent to a person skilled in the art from the appended patent claims.
Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a// the [ device, component, etc ]" are to be interpreted openly as referring to at least one instance of a device, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.
Claims (12)
1. A method for detecting the reception and transmission capability of a low voltage power line carrier module, the method comprising:
a signal amplification circuit of the test equipment sends a beacon frame to a tested carrier module, and the tested carrier module sends a network access request frame to the test equipment based on the beacon frame;
the test equipment carries out networking based on the received network access request frame, and sends a test excitation signal to the tested carrier module after adjusting the adjustable signal attenuation circuit to the maximum attenuation value;
and the carrier receiving circuit of the test equipment receives a response signal of the tested carrier module responding to the test excitation signal, and the test equipment judges the transmitting capacity of the tested carrier module based on the response signal.
2. The method of claim 1, wherein the carrier receiving circuit of the test device receives a response signal of the tested carrier module in response to the test excitation signal, and the test device determines the transmitting capability of the tested carrier module based on the response signal, comprising:
the carrier receiving circuit of the test equipment comprises: the device comprises a carrier signal receiving filter, a received signal voltage division circuit, a received signal reduction circuit, a differential-to-single-ended and positive-negative peak signal holding circuit;
the carrier signal receiving filter is connected with the received signal partial pressure;
the receiving signal voltage division and the receiving signal reduction are connected with the differential-to-single end;
the differential-to-single end is connected with the positive and negative peak signal holding circuit;
the carrier receiving circuit divides the response signals into three groups of signals, wherein the first signal is a normal receiving signal which is output by restoring the receiving signal, and the peak value of the response signal sent by the tested carrier module is judged through the normal receiving signal; the second signal is a positive peak signal output by the differential-to-single-ended and positive-negative peak signal holding circuit; the third signal is a negative peak signal output by the differential-to-single-ended and positive-negative peak signal holding circuit;
and judging the transmitting capacity of the tested carrier module based on the peak value of the response signal, the positive peak value signal and the negative peak value signal.
3. The method of claim 2, further comprising:
holding the positive peak signal and the negative peak signal output by the differential-to-single-ended and positive-negative peak signal holding circuit as a positive peak signal P and a negative peak signal N;
collecting a positive peak voltage reference value V of the positive peak signal P in the absence of a carrier signal BP And a negative peak voltage reference value V of the negative peak signal N BN ；
When the sampling voltage V of the positive peak signal P P And the positive peak voltage reference value V BP Or when the sampled voltage V of the negative peak signal N N And the negative peak voltage reference value V BN Is greater than the carrier signal judgment threshold V E Then recording the sampling voltage V P And a sampling voltage V N ；
Will record the sampling voltage V P And a sampling voltage V N Marking every W sampling points as a sampling window, and after every W sampling voltages are obtained, counting W sampling pointsThe average value of the sampling voltage is calculated once to obtain the average value V of the sampling window iP 、V iN Continuously recording the average value to obtain V 1P 、V 1N ……V iP 、V iN ；
If any one sampling average value V of M sampling windows iP 、V iN The value is lower than the corresponding signal effective threshold value or any one sampling average value V iN If the value is lower than the effective threshold value of the signal, the answer signal is judged to be noise or ineffective carrier signal, and the recorded sampling average value V is eliminated iP 、V iN ；
If the average value V of the samples of the M sampling windows iP 、V iN Respectively higher than the corresponding effective threshold value of the signal, judging the response signal as an effective carrier signal, and continuously recording the sampling average value V of each sampling window iP 、V iN When the sampling average value V of continuous 3 sampling serial ports iP 、V iN Judging that the signal is finished when the value is lower than the signal effective threshold value; average value V of sampling voltage of all recorded sampling windows iP 、V iN The average value is calculated again to obtain the positive peak value sampling average value V of a frame of effective carrier signal Pout And negative peak sample average V Nout ；
According to the positive peak value sampling average value V of a frame of effective carrier signal Pout Negative peak sample average V Nout Positive peak voltage reference value V BP Negative peak voltage reference value V BN Calculating the peak value V of the differential signal of the carrier signal pp ：
V pp =(V Pout -V BP )+(V Nout -V BN )
Calculating the positive peak signal V Pout -V BP With negative peak signal V Nout -V BN When the difference is greater than a preset threshold, the response message is judged to be asymmetric.
4. The method of claim 3, wherein the value of M is determined by the shortest frame length T of the carrier signal, the sampling rate S and the number W of sampling points of the sampling window:
M=T / 2×S / W。
5. the method of claim 1, further comprising:
and when the tested carrier module cannot respond to the test excitation signal and cannot receive a response signal of the tested carrier module responding to the test excitation signal through the test equipment, reducing the attenuation value of the adjustable signal attenuation circuit and then sending the test excitation signal to the tested carrier module.
6. The method of claim 5, further comprising:
and when the attenuation value of the adjustable signal attenuation circuit is adjusted to be minimum and the tested carrier module still cannot respond to the test excitation signal, judging that the tested carrier module has a receiving fault.
7. A system for detecting receive and transmit capabilities of a low voltage power line carrier module, the system comprising: the device comprises a test device and a tested carrier module;
the test equipment is used for sending a beacon frame to the tested carrier module; networking based on the received network access request frame, adjusting the adjustable signal attenuation circuit to the maximum attenuation value, and then sending a test excitation signal to the tested carrier module; the response signal is used for receiving the response of the tested carrier module to the test excitation signal; judging the transmitting capacity of the tested carrier module based on the response signal;
the tested carrier module is used for sending a network access request frame to the test equipment based on the beacon frame; for generating a response signal in response to said test stimulus signal.
8. The system of claim 7, wherein the first and second sensors are arranged in a single package,
the carrier receiving circuit of the test equipment comprises: the device comprises a carrier signal receiving filter, a received signal voltage division circuit, a received signal reduction circuit, a differential-to-single-ended and positive-negative peak signal holding circuit;
the carrier signal receiving filter is connected with the received signal partial pressure;
the receiving signal voltage division and the receiving signal reduction are connected with the differential-to-single end;
the differential-to-single end is connected with the positive and negative peak signal holding circuit;
the carrier receiving circuit is used for dividing the response signals into three groups of signals, wherein the first signal is a normal receiving signal which is output by restoring the receiving signal, and the peak value of the response signal sent by the tested carrier module is judged according to the normal receiving signal; the second signal is a positive peak signal output by the differential-to-single-ended and positive-negative peak signal holding circuit; the third signal is a negative peak signal output by the differential-to-single-ended and positive-negative peak signal holding circuit;
and judging the transmitting capacity of the tested carrier module based on the peak value of the response signal, the positive peak value signal and the negative peak value signal.
9. The system of claim 8, the test device further to:
holding the positive peak signal and the negative peak signal output by the differential-to-single-ended and positive-negative peak signal holding circuit as a positive peak signal P and a negative peak signal N;
collecting a positive peak voltage reference value V of the positive peak signal P in the absence of a carrier signal BP And a negative peak voltage reference value V of the negative peak signal N BN ；
When the sampling voltage V of the positive peak signal P P And the positive peak voltage reference value V BP Or when the sampled voltage V of the negative peak signal N N And the negative peak voltage reference value V BN Is greater than the carrier signal judgment threshold V E Then recording the sampling voltage V P And a sampling voltage V N ；
Will record the sampling voltage V P And a sampling voltage V N Recording every W sampling points as a sampling window, and obtaining every W sampling pointsAfter W sampling voltages are reached, carrying out primary average calculation on the W sampling voltages to obtain an average value V of a sampling window iP 、V iN Continuously recording the average value to obtain V 1P 、V 1N ……V iP 、V iN ；
If any one sampling average value V of M sampling windows iP 、V iN The value is lower than the corresponding signal effective threshold value or any one sampling average value V iN If the value is lower than the effective threshold value of the signal, the answer signal is judged to be noise or ineffective carrier signal, and the recorded sampling average value V is eliminated iP 、V iN ；
Average value V of samples of M sampling windows iP 、V iN Respectively higher than the corresponding effective threshold value of the signal, judging the response signal as an effective carrier signal, and continuously recording the sampling average value V of each sampling window iP 、V iN When the sampling average value V of continuous 3 sampling serial ports iP 、V iN Judging that the signal is finished when the value is lower than the signal effective threshold value; average value V of sampling voltage of all sampling windows to be recorded iP 、V iN The average value is calculated again to obtain the positive peak value sampling average value V of a frame of effective carrier signal Pout And negative peak sample average V Nout ；
According to the positive peak value sampling average value V of a frame of effective carrier signal Pout Negative peak sample average V Nout Positive peak voltage reference value V BP Negative peak voltage reference value V BN Calculating the peak value V of the differential signal of the carrier signal pp ：
V pp =(V Pout -V BP )+(V Nout -V BN )
Calculating the positive peak signal V Pout -V BP With negative peak signal V Nout -V BN When the difference is larger than a preset threshold value, the response message is judged to be asymmetric.
10. The system of claim 9, wherein the value of M is determined by the carrier signal shortest frame length T, the sampling rate S, and the number of sampling window samples W:
M=T / 2×S / W。
11. the system of claim 7, the test device, further to:
and when the tested carrier module cannot respond to the test excitation signal and cannot receive a response signal of the tested carrier module responding to the test excitation signal through the test equipment, reducing the attenuation value of the adjustable signal attenuation circuit and then sending the test excitation signal to the tested carrier module.
12. The system of claim 11, the test device, further to:
and when the attenuation value of the adjustable signal attenuation circuit is adjusted to be minimum and the tested carrier module still cannot respond to the test excitation signal, judging that the tested carrier module has a receiving fault.
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| JP2010187293A (en) * | 2009-02-13 | 2010-08-26 | Hitachi Ltd | Demodulating device for power-line carrier communication |
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| CN110716183A (en) * | 2019-10-18 | 2020-01-21 | 上海微波技术研究所（中国电子科技集团公司第五十研究所） | Handheld detector of X-waveband guide responder and testing method thereof |
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| JP2010187293A (en) * | 2009-02-13 | 2010-08-26 | Hitachi Ltd | Demodulating device for power-line carrier communication |
| CN107425881A (en) * | 2017-06-06 | 2017-12-01 | 中国电力科学研究院 | A kind of method and system tested for low-voltage power line bandwidth carrier communication performance |
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