CN101902255B - Simulation test device and method of power line carrier communication - Google Patents
Simulation test device and method of power line carrier communication Download PDFInfo
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- CN101902255B CN101902255B CN2010101438994A CN201010143899A CN101902255B CN 101902255 B CN101902255 B CN 101902255B CN 2010101438994 A CN2010101438994 A CN 2010101438994A CN 201010143899 A CN201010143899 A CN 201010143899A CN 101902255 B CN101902255 B CN 101902255B
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Abstract
The invention discloses a simulation test device and a method of power line carrier communication. The device comprises an information source test platform, an information sink test platform, a grid simulation reconfiguration channel and a T-shaped symmetrical isolator, wherein the T-shaped symmetrical isolator is provided with an input end, a first output end and a second output end, an isolating circuit configuration between the input end and the first output end of the T-shaped symmetrical isolator is same with an isolating circuit configuration between the input end and the second output end, the input end of the T-shaped symmetrical isolator is connected with an external power network, the first output end is connected to the power input end of the information source test platform, the second output end is connected to the power input end of the information sink test platform, and the communication simulation imitation test is carried out between the information source test platform and the information sink test platform through the grid simulation reconfiguration channel. The invention can imitate channel parameters, such as on-site noise, time-variable impedance, dynamic attenuation, and the like in a simulation grid environment and can control and test in the channel reconfiguration process without being influenced by external factors.
Description
Technical field
The present invention relates to the power line carrier communication field, relate in particular to a kind of power line carrier communication simulation testing device and method, be used for check and test to the power communication product.
Background technology
In recent years, the power line carrier communication product comes into the market in the double drive of the market demand and national policy lower the sixth of the twelve Earthly Branches fast.But these class communication products have run into serious challenge during operation in the channel circumstance of the high very noisy of actual electric network, dynamic attenuation, time-variable impedance.A lot of products differ greatly apart from real requirement, its main cause is: the first, power line is a kind of typical random channel as communication channel, shift at present the correlation technique of coming from traditional constant-parameter channel communications field, can't adapt to the time flexible letter environment of this random channel of power line; The second, the existing method and apparatus that the power line carrier communication product is communicated quality testing can't satisfy the specification requirement in this field; Because the effective checking means of shortage and analysis are improved one's methods in exploitation, production, application process, therefore cause Related product can't adapt to the situation of actual electric network operation.How to simulate and emulation electrical network site environment, thereby analyze and performance, quality, reliability, the adaptability of checking product, become the difficult problem of current power line carrier digital communication technical field.
Practice shows, the power line carrier communication product will guarantee to move in the actual electric network environment, the analog simulation test platform of power line channel environment must be provided in research and development, production and testing process, therefore, market is in the urgent need to a kind of simulator that can satisfy research and development, production, testing requirement.And require this class device can finish to the motional impedance in the power line channel environment, random noise, the time become the main channel parameter such as decay and voltage fluctuation carry out artificial controllable and measurable, the simulation operations of qualitative, quantitative.
Existing power line carrier communication product testing equipment as shown in Figure 1, external power Netcom crosses isolator and is connected to information source end A point (signal sending end), carrier wave main frame (carrier telecommunication) is connected to information source end A point by coupler, carrier terminal is connected to stay of two nights end B point (signal receiving end) by coupler, artificial simulation electrical network (manual simulation's electrical network), at the setting parameter of artificial simulation electrical network by acoustic meter, attenuator, tunable load, the artificial actual power grid environment, the performance of test carrier wave main frame and carrier terminal.
The present invention finds that there is following major defect at least in this equipment:
1, reach impedance isolation truly because present technology can't be accomplished isolator among the figure, so the motional impedance of external power grid can be reflected on the inner artificial electrical network, the uncontrollability of formation Intranet causes the randomness of test result;
2, be a kind of dissymmetric network between information source end A point and the stay of two nights end B point among the figure, make up channel and down channel have asymmetry and uncontrollability, test result is difficult to quantize;
3, all equipment must be connected with interior electrical network by coupler, and its network amplitude-frequency and phase-frequency characteristic are difficult to accomplish smooth reasonable, and the modulation of each parameter is difficult to accomplish qualitative, quantitative, is difficult to the simulation requirements that reaches realistic;
4, still do not have directly to carry out channel impedance, attenuation, the frequency characteristic of electrical network itself at present the method and apparatus of analysis to measure, so this class device itself has immeasurability.
Summary of the invention
In order to solve the problems referred to above of prior art, the purpose of this invention is to provide a kind of power line carrier communication simulation testing device and method, the channel parameters such as the on-the-spot noise in can the analog simulation power grid environment, time-variable impedance, dynamic attenuation, and in the channel reconstruction process, accomplish controllable and measurablely, be not subjected to the impact of extraneous factor.
To achieve these goals, the invention provides a kind of power line carrier communication simulation testing device, comprise the information source test platform, stay of two nights test platform and grid simulation reconstruct channel, it is characterized in that, comprise that also access external power net is respectively to the T-shaped symmetrical isolating device of described information source test platform and the power supply of stay of two nights test platform, described T-shaped symmetrical isolator has input, the first output and the second output, buffer circuit structure between the input of described T-shaped symmetrical isolator and the first output and the buffer circuit of input and the second output structure are identical, the input of described T-shaped symmetrical isolator connects described external power net, described the first output connects the power input of information source test platform, and described the second output connects the power input of stay of two nights test platform.Carry out emulation and the test of the channel parameters such as on-the-spot noise, time-variable impedance, dynamic attenuation by grid simulation reconstruct channel between described information source test platform and the stay of two nights test platform.
As preferably, the input of described T-shaped symmetrical isolator specifically comprises outer net filter, input transformer, the first trap, the second trap, the first isolating transformer that is connected in turn with circuit structure between the first output; The input of described T-shaped symmetrical isolator specifically comprises outer net filter, input transformer, the 3rd trap, the 4th trap, the second isolating transformer that is connected in turn with circuit structure between the second output.
As preferably, described information source test platform or stay of two nights test platform comprise: the carrier signal interface, the power analysis device, signal analyzer, the impedance analysis device, regulation and control communication component and computer controller, described carrier signal interface is used for accessing tested carrier telecommunication, described power analysis device is for the power that transmits and receives of the carrier signal of analyzing described tested carrier telecommunication, described signal analyzer is used for analyzing the frequency spectrum of carrier signal, amplitude, waveform, modulation and demodulation parameter, described impedance analysis device is used for analyzing the complex impedance of described grid simulation reconstruct channel, described regulation and control communication component is used for communicating with described grid simulation reconstruct interchannel, and described computer controller is used for controlling described power analysis device, signal analyzer, the impedance analysis device, regulation and control communication component and display analysis test result.
As preferably, described regulation and control communication component and described grid simulation reconstruct interchannel communicate by optical fiber.
As preferably, be loaded with any or its combination in programmable attenuator, DDS noise generator and the channel impedance modulation instrument on the described grid simulation reconstruct channel.
As preferably, described stay of two nights test platform also comprises the voltage flicker instrument, is used for the voltage of inputting described stay of two nights test platform is produced voltage flicker.
To achieve these goals, the present invention also provides a kind of power line carrier communication emulation test method, comprising:
Use T-shaped symmetrical isolating device access external power net respectively to information source test platform and the power supply of stay of two nights test platform;
Respectively at described information source test platform and stay of two nights test platform access circuit-under-test line carrier communication equipment;
Connect information source test platform and stay of two nights test platform by grid simulation reconstruct channel, and by the parameter of adjusting grid simulation reconstruct channel circuit-under-test line carrier communication equipment is carried out emulation testing;
Wherein, described T-shaped symmetrical isolator has input, the first output and the second output, circuit structure between the input of described T-shaped symmetrical isolator and the first output and the circuit structure of input and the second output are identical, the input of described T-shaped symmetrical isolator connects described external power net, described the first output connects the power input of information source test platform, and described the second output connects the power input of stay of two nights test platform.
As preferably, the parameter of described adjustment grid simulation reconstruct channel comprises attenuation, the superimposed noise amount of adjusting channel and adjusts the channel impedance value.
As preferably, the input of described T-shaped symmetrical isolator specifically comprises outer net filter, input transformer, the first trap, the second trap, the first isolating transformer that is connected in turn with circuit structure between the first output; The input of described T-shaped symmetrical isolator specifically comprises outer net filter, input transformer, the 3rd trap, the 4th trap, the second isolating transformer that is connected in turn with circuit structure between the second output.
As preferably, described respectively after described information source test platform and stay of two nights test platform access circuit-under-test line carrier communication equipment, also comprise: the voltage of inputting described stay of two nights test platform is applied voltage flicker.
Beneficial effect of the present invention is, by T-shaped symmetrical isolating device is set, so that external power net and information source test platform, be in the high resistant isolation between the stay of two nights test platform, the impedance variation of external power grid is very little on the impact of grid simulation reconstruct channel (Intranet), thereby can be by channel parameters such as the on-the-spot noise in the grid simulation reconstruct channel simulation emulation power grid environment, time-variable impedance, dynamic attenuation, and in the channel reconstruction process, accomplish controllable and measurablely, be not subjected to the impact of extraneous factor.Simultaneously, the present invention can carry out the parameter analysis and implement regulation and control carrier signal and carrier channel by described carrier channel reconstructing method and instrument integration method.
Description of drawings
Fig. 1 is the structural representation of the Power Line Communication Simulation testing equipment of prior art.
Fig. 2 is the structural representation of the Power Line Communication Simulation testing apparatus of the embodiment of the invention.
Fig. 3 is a kind of structural representation of the T-shaped symmetrical isolating device among Fig. 2.
Fig. 4 is a kind of structural representation of the information source test platform among Fig. 2.
Fig. 5 is a kind of structural representation of the grid simulation reconstruct channel among Fig. 2.
Fig. 6 is a kind of internal circuit diagram of the isolator among Fig. 3.
Fig. 7 is the test philosophy figure of the impedance analysis device among Fig. 4.
Fig. 8 is a kind of internal circuit diagram of the voltage flicker instrument among Fig. 3.
Fig. 9 is the detailed construction schematic diagram of Fig. 3.
Figure 10 is the flow chart of the power line carrier communication emulation test method of the embodiment of the invention.
Embodiment
Describe embodiments of the invention in detail below in conjunction with accompanying drawing.
Extremely shown in Figure 9 such as Fig. 2, the power line carrier communication simulation testing device of present embodiment comprises information source test platform 21, stay of two nights test platform 23, grid simulation reconstruct channel 22, and access external power net 10 is given respectively the T-shaped symmetrical isolating device 20 of described information source test platform 21 and 23 power supplies of stay of two nights test platform, described T-shaped symmetrical isolator 20 has input, the first output and the second output, buffer circuit structure between the input of described T-shaped symmetrical isolator and the first output and the buffer circuit of input and the second output structure are identical (symmetrically namely), the input of described T-shaped symmetrical isolator 20 connects described external power net 10, described the first output connects the power input of information source test platform 21, and described the second output connects the power input of stay of two nights test platform 23.The circuit structure powering mode of this symmetrical isolation has reduced the impact of external power net 10 on grid simulation reconstruct channel 22, so that the emulation testing process is controlled, test result is reliable and stable.
The input of T-shaped symmetrical isolator 20 described in the present embodiment is constructed with the buffer circuit between the first output and is specifically comprised outer net filter 201, input transformer 202, the first trap 203, the second trap 204, the first isolating transformer 205 that is connected in turn; The input of described T-shaped symmetrical isolator is constructed with the buffer circuit between the second output and is specifically comprised outer net filter 201, input transformer 202, the 3rd trap 206, the 4th trap 207, the second isolating transformer 208 that is connected in turn.In order to prevent the carrier signal radiation effect to the impact of isolation effect, all parts and wire all adopt the spacious measure of screen.Can find out that what give information source test platform 21 and stay of two nights test platform 23 is full symmetric for electric isolating circuit.Symmetrical buffer circuit is so that external power net 10 and information source test platform 21 are in the high resistant isolation between the stay of two nights test platform 23, and the impedance variation of external power net 10 is very little on the impact of grid simulation reconstruct channel 22 (Intranets).The internal circuit of outer net filter 201, the first trap 203, the second trap 204, the 3rd trap 206, the 4th trap 207 as shown in Figure 6, carrier signal for 20KHZ～500KHZ, itself all have the attenuation greater than-35db, uneven degree is less than 10db in the band.By test, carrier signal for 20KHZ～500KHZ, between the input of T-shaped symmetrical isolator 20 and the first output or the attenuation between input and the second output greater than-70db, the attenuation of the first output and the second output is greater than-110db, and mutual isolation effect is good.During open circuit, the 100KHZ frequency real impedance between the input of T-shaped symmetrical isolator 20 and the first output or between input and the second output is greater than 10
4Ω manifests high-impedance state to carrier signal.The first isolating transformer 205, the second isolating transformer 208 have further lowered the impedance variation of external power net 10 to the impact of grid simulation reconstruct channel 22, thereby so that grid simulation reconstruct channel 22 is stablized controlledly, the simulation results reliability is higher.Certainly, the physical circuit form of T-shaped symmetrical isolator 20 can have a variety of, as long as symmetrical isolation, has just provided concrete a kind of in this enforcement.
As shown in Figure 4, information source test platform 21 or the stay of two nights test platform 23 of present embodiment comprise: carrier signal interface 211, power analysis device 212, signal analyzer 213, impedance analysis device 214, regulation and control communication component 215 and computer controller 216, described carrier signal interface 211 is used for accessing tested carrier telecommunication, described power analysis device 212 be used for analyzing described tested carrier telecommunication carrier signal transmit and receive power (comprising forward power and backward power); Described signal analyzer 213 is used for analyzing frequency spectrum, amplitude, waveform, modulation and the demodulation parameter (virtual instrument that comprehensively integrates frequency spectrograph, oscilloscope, digital universal meter, signal analyzer of carrier signal, can carry out qualitative and quantitative analysis to carrier signal), and the energy detection display error rate (to the situation of known modulation standard); Described impedance analysis device 214 is used for analyzing the complex impedance of described grid simulation reconstruct channel, its measuring principle figure as shown in Figure 7, by measuring-signal waveforms amplitude v
iWith sample resistance R
rOn waveforms amplitude V
r, know R the sixth of the twelve Earthly Branches
rValue is used formula
Calculate complex impedance value Z, then measure v
iAnd v
rThe phase difference θ of two waveform pass zero points calculates real impedance R and imaginary impedance X value with formula R=|Z|cos θ and X=|Z|sin θ again, and whole process is finished and shown by computer software; Described regulation and control communication component 215 be used for and described each program control parts between communicate, described computer controller 216 is used for controlling described power analysis device 212, signal analyzer 213, impedance analysis device 214, regulation and control communication component 215 and display analysis test result.Utilize 485 buses to communicate between carrier signal interface 211, power analysis device 212, signal analyzer 213, impedance analysis device 214, regulation and control communication component 215 and the computer controller 216, computer controller 216 shows various analysis data by the particular virtual instrument software and by instruction parameter is regulated and control.Communicate by optical fiber 41 between described regulation and control communication component 215 and the described grid simulation reconstruct channel 22, corresponding optical fiber is set turns 485 change-over circuits and get final product.Carrier signal between information source test platform 21 and the grid simulation reconstruct channel 22 is coupled by signal coupler 40.
As shown in Figure 5, be loaded with programmable attenuator 221, DDS (numeral is synthetic) noise generator 222 and channel impedance modulation instrument 223 on the described grid simulation reconstruct channel 22, certainly, can select any or its combination wherein during test, can be two kinds, also can three kinds of simultaneously loadings.Signal between stay of two nights test platform 23 and the grid simulation reconstruct channel 22 is coupled by signal coupler 50.Programmable attenuator 221 is responsible for the modulation of fading channel amount, programmable attenuator 221 is attenuators of a remote control and regulation in the present embodiment, control software instruction and be transported to its inner MCU by regulation and control communication component 215, carry out a group relay through decoding and move to switch attenuation, the adjustable attenuator of ten groups of 1db step attenuators and nine groups of 10db step attenuator cascade formation 0～99db; DDS noise generator 222 is responsible for the stack of noisiness and the playback of on-the-spot noise record ripple, it can produce the 10KHZ～white noise of 1MHZ frequency, pink noise, impulsive noise, and can produce the field simulation noise by the mode of the on-the-spot interference noise wave record playback of electrical network, noise signal is by the programmable amplifier channel that is added to, noise amplitude from 0dbm to+28dbm is adjustable continuously; Channel impedance modulation instrument 223 is responsible for the adjustment of channel impedance, and its real impedance can be from the continuous modulation of 0.5 Ω to 1k Ω, the variation that imaginary impedance can modulation channel phase angle ± 30 ° (capacitive reactance be to induction reactance).
Described stay of two nights test platform 23 also comprises voltage flicker instrument 231, be used for the voltage of inputting described stay of two nights test platform is produced voltage flicker, its internal circuit as shown in Figure 8, by the mode programming device can carry out that voltage entirely falls, partly falls, sawtooth flickering, spark flicker test, can test the reactance voltage flickering performance of test product.
The parameter index of the power line carrier communication simulation testing device of this enforcement is as follows:
1, three large functions:
1.1, power line carrier communication conventional parameter item measuring ability, output key property test report;
1.2, power line carrier communication channel reconstruction copying, comprising: changing environment emulation when the emulation of characteristic of channel impedance, interchannel noise model emulation, fading channel model emulation, channel, output show in real time and the accommodation test report;
1.3, the electric network voltage flicker emulation testing, the output reliability test report.
2, test event introduction:
2.1, power line carrier communication conventional project calibrating: comprising: centre frequency, modulation bandwidth, modulation classification, signal strength signal intensity, harmonic constant etc.;
2.2, absolute sensitivity: power line carrier equipment is at 50 Ω, the anti-ageing decrement in the 0db noisy communication channel;
2.3, effective sensitivity: power line carrier equipment is at 50 Ω, the anti-ageing decrement the in+10db noisy communication channel;
2.4, the antinoise index: power line carrier equipment is at 50 Ω, the antinoise stack amount the in-35db attenuation channel;
2.5, the impedance adaptive criteria:
1. the power line carrier terminal equipment is at-35db attenuation, the impedance modulation adaptive capacity the in+10db noisy communication channel;
2. the power line carrier main process equipment is at-35db attenuation, the impedance modulation adaptive capacity the in+10db noisy communication channel;
2.6, electric network voltage flicker adaptability:
The power line carrier terminal equipment is in-35db attenuation, and in+10db the noisy communication channel, the grade of anti-electric network voltage flicker is with 1,2,3 grade of expression;
Circuit in the present embodiment can realize at existing integrated circuit or mcu basis, and related software can realize with virtual instrument EDA, and is simple, can obtain in the actual tests test with other equipment performance that is beyond one's reach.
The power line carrier communication simulation testing device of this enforcement is by arranging T-shaped symmetrical isolating device, so that external power net and information source test platform, be in the high resistant isolation between the stay of two nights test platform, the impedance variation of external power grid is very little on the impact of grid simulation reconstruct channel (Intranet), thereby can come channel parameters such as on-the-spot noise, time-variable impedance, dynamic attenuation in the analog simulation power grid environment by the parameter of adjusting grid simulation reconstruct channel, and in the channel reconstruction process, accomplish controllable and measurablely, be not subjected to the impact of extraneous factor.
As shown in figure 10, the power line carrier communication emulation test method of present embodiment comprises:
S11: use T-shaped symmetrical isolating device access external power net respectively to information source test platform and the power supply of stay of two nights test platform;
S12: respectively at described information source test platform and stay of two nights test platform access circuit-under-test line carrier communication equipment;
S13: circuit-under-test line carrier communication equipment is carried out emulation testing by the parameter of adjusting grid simulation reconstruct channel;
Wherein, described T-shaped symmetrical isolator has input, the first output and the second output, buffer circuit structure between the input of described T-shaped symmetrical isolator and the first output and the buffer circuit of input and the second output structure are identical, the input of described T-shaped symmetrical isolator connects described external power net, described the first output connects the power input of information source test platform, and described the second output connects the power input of stay of two nights test platform.
The parameter of described adjustment grid simulation reconstruct channel comprises attenuation, the superimposed noise amount of adjusting channel and adjusts the channel impedance value.
The input of described T-shaped symmetrical isolator is constructed with the buffer circuit between the first output and is specifically comprised outer net filter, input transformer, the first trap, the second trap, the first isolating transformer that is connected in turn; The input of described T-shaped symmetrical isolator is constructed with the buffer circuit between the second output and is specifically comprised outer net filter, input transformer, the 3rd trap, the 4th trap, the second isolating transformer that is connected in turn.
Described respectively after described information source test platform and stay of two nights test platform access circuit-under-test line carrier communication equipment, can also comprise: the voltage of inputting described stay of two nights test platform is applied voltage flicker.
The method implementation procedure of present embodiment is with reference to the concrete elaboration among the above-mentioned power line carrier communication simulation testing device embodiment.
Above embodiment is exemplary embodiment of the present invention only, is not used in restriction the present invention, and protection scope of the present invention is defined by the claims.Those skilled in the art can make various modifications or be equal to replacement the present invention in essence of the present invention and protection range, this modification or be equal to replacement and also should be considered as dropping in protection scope of the present invention.
Claims (8)
1. power line carrier communication simulation testing device, comprise the information source test platform, stay of two nights test platform and grid simulation reconstruct channel, it is characterized in that, comprise that also access external power net is respectively to the T-shaped symmetrical isolating device of described information source test platform and the power supply of stay of two nights test platform, described T-shaped symmetrical isolator has input, the first output and the second output, the input of described T-shaped symmetrical isolator is constructed with the buffer circuit between the first output and is specifically comprised the outer net filter that is connected in turn, input transformer, the first trap, the second trap, the first isolating transformer, the input of described T-shaped symmetrical isolator is constructed with the buffer circuit between the second output and is specifically comprised the outer net filter that is connected in turn, input transformer, the 3rd trap, the 4th trap, the second isolating transformer, the input of described T-shaped symmetrical isolator connects described external power net, described the first output connects the power input of information source test platform, and described the second output connects the power input of stay of two nights test platform.
2. power line carrier communication simulation testing device according to claim 1, it is characterized in that, described information source test platform or stay of two nights test platform comprise: the carrier signal interface, the power analysis device, signal analyzer, the impedance analysis device, regulation and control communication component and computer controller, described carrier signal interface is used for accessing tested carrier telecommunication, described power analysis device is for the power that transmits and receives of the carrier signal of analyzing described tested carrier telecommunication, described signal analyzer is used for analyzing the frequency spectrum of carrier signal, amplitude, waveform, modulation and demodulation parameter, described impedance analysis device is used for analyzing the complex impedance of described grid simulation reconstruct channel, described regulation and control communication component is used for communicating with described grid simulation reconstruct interchannel, and described computer controller is used for controlling described power analysis device, signal analyzer, the impedance analysis device, regulation and control communication component and display analysis test result.
3. power line carrier letter simulation testing device according to claim 2 is characterized in that described regulation and control communication component and described grid simulation reconstruct interchannel communicate by optical fiber.
4. power line carrier communication simulation testing device according to claim 1 is characterized in that, is loaded with any or its combination in programmable attenuator, DDS noise generator and the channel impedance modulation instrument on the described grid simulation reconstruct channel.
5. power line carrier communication simulation testing device according to claim 1 is characterized in that, described stay of two nights test platform also comprises the voltage flicker instrument, is used for the voltage of inputting described stay of two nights test platform is produced voltage flicker.
6. a power line carrier communication emulation test method is characterized in that, comprising:
Use T-shaped symmetrical isolating device access external power net respectively to information source test platform and the power supply of stay of two nights test platform;
Respectively at the tested carrier telecommunication of described information source test platform and stay of two nights test platform access, and the integral instrument by platform detects in real time carrier signal parameter and channel parameter and regulates and control;
Connected by grid simulation reconstruct channel between information source test platform and the stay of two nights test platform, by the parameter of adjusting grid simulation reconstruct channel circuit-under-test line carrier communication equipment is carried out emulation testing;
Wherein, described T-shaped symmetrical isolator has input, the first output and the second output, and the input of described T-shaped symmetrical isolator specifically comprises outer net filter, input transformer, the first trap, the second trap, the first isolating transformer that is connected in turn with circuit structure between the first output; The input of described T-shaped symmetrical isolator specifically comprises outer net filter, input transformer, the 3rd trap, the 4th trap, the second isolating transformer that is connected in turn with circuit structure between the second output, the input of described T-shaped symmetrical isolator connects described external power net, described the first output connects the power input of information source test platform, and described the second output connects the power input of stay of two nights test platform.
7. power line carrier communication emulation test method according to claim 7 is characterized in that, the parameter of described adjustment grid simulation reconstruct channel comprises attenuation, superimposed noise amount and the channel impedance value of adjusting channel.
8. power line carrier communication emulation test method according to claim 7, it is characterized in that, described respectively after described information source test platform and stay of two nights test platform access circuit-under-test line carrier communication equipment, also comprise: the voltage of inputting described stay of two nights test platform is applied voltage flicker.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW429314B (en) * | 1999-05-14 | 2001-04-11 | Ind Tech Res Inst | Power line resistance measuring method and apparatus |
| TWI302064B (en) * | 2002-01-24 | 2008-10-11 | Matsushita Electric Ind Co Ltd | Power-line carrier communication apparatus |
| CN101404523A (en) * | 2008-11-19 | 2009-04-08 | 南京新联电子股份有限公司 | Low-voltage powerline carrier communication experiment method and its experiment system |
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