CN104734745A - Power line broadband carrier communication module networking test system of built-in programmable attenuator - Google Patents
Power line broadband carrier communication module networking test system of built-in programmable attenuator Download PDFInfo
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Abstract
A power line broadband carrier communication module networking test system of a built-in programmable attenuator comprises a power module, a broadband power-line carrier route module, a processing unit and networking units; the processing unit is connected with the broadband power-line carrier route module, the broadband power-line carrier route module is connected with one networking unit through a shielding radio frequency line, the rest networking units are in cascade connection with other networking units for networking through other shielding radio frequency lines, and the power module is connected with the networking units; the networking units are provided with multiple carrier modules, each carrier module is connected with a single chip microcomputer, and programmable attenuators which can conduct controlling through the carrier communication method of the programmable attenuators are arranged in the networking units, so that the replacement of the carrier module can be convenient, the system setting is not affected, the sizes of attenuation values and carrier signal route directions of communication nodes can be controlled, computer adaptive networking is achieved, client programs such as an ammeter or street lamp control or smart home can be written in the single chip microcomputer, and network tests used for various applications are achieved.
Description
Technical field
The invention belongs to power wire broadband carrier communication technical field, particularly relate to a kind of Power Line Carrier Communication Module networking test macro.
Background technology
In recent years, the power wire broadband carrier chip of energy conservation and home automation is applied to along with high pass Atheros and Huawei Hai Si release one after another, power wire broadband carrier technology replaces narrow-band power line carrier technology gradually with advantage more stable, more at a high speed, enters Electricity Meters Auto Transcription System, Street lamps control and Smart Home field.But, networking test platform for power wire broadband carrier communication module does not have a ripe scheme and can simulate various complicated site environment and realize flexible and changeable routing mode, is used for checking routing algorithm and the networking capability limit of different carrier scheme.
Current immediate solution is that publication number a kind of power line carrier disclosed in the Chinese invention patent application of 103700244A is checked meter networking test macro, it is by a concentrator, the Monophase electric power carrier networking experiment porch of carrier attenuation device and multiple electric energy meter composition, concentrator lambda line unit comprises total lambda line insert row, master switch, isolating transformer, first carrier attenuator, concentrator and the first line bank for each connection in concentrator lambda line unit, carrier electric power table unit comprises carrier attenuation device, carrier electric energy meter and the line bank for connection each in carrier electric power table unit, test connecting line between concentrator lambda line unit with each carrier electric power table unit to be connected respectively by the first line bank, line bank, this test macro adopts based on the setting of a concentrator lambda line unit, many carrier electric power table units, realizes the experimental study of single-phase electricity line of force carrier networking, by line bank wiring in backplate junction box or by patch jack on front panel, realize test needed for network topology connect, thus meet power line carrier check meter networking test demand.But this test macro adopts electric energy meter networking, and need external carrier attenuation device, volume greatly, shielding is difficult, cost is high, cannot meet large-scale network-estabilishing requirement.
Summary of the invention
The object of this invention is to provide a kind of networking test macro of power wire broadband carrier module of built-in programmable attenuator, various site environment and routing mode can be simulated, check routing algorithm and the networking capability limit of different bandwidth carrier scheme, and utilize the carrier communication mode of self to control built-in programmable attenuator, thus can pad value size between computer control carrier signal route direction and each communication node.
To achieve these goals, the present invention takes following technical solution:
The power wire broadband carrier communication network module test macro of built-in programmable attenuator, comprising: power module, broadband power line carrier routing module, processing unit and at least one networking unit, described processing unit is connected with described broadband power line carrier routing module, described broadband power line carrier routing module is connected with a networking unit by shielded radio frequency line, this networking unit is by shielded radio frequency line and the unit cascaded networking of other networking, described power module is connected with described networking unit, for described networking unit is powered, wherein, described networking unit comprises circuit substrate, the carrier signal programmable attenuator be arranged on described circuit substrate, carrier signal coupler, several carrier module, carrier signal electronic switch, radio frequency connector, described circuit substrate is located in metal shell, each carrier module described is connected with a single-chip microcomputer be arranged on circuit substrate, is connected between adjacent carrier module by holding wire, described radio frequency connector comprises the power supply be connected with power module and inputs connector, the higher level's routing node connector be connected with higher level's networking unit and the subordinate's routing node connector be connected with subordinate networking unit, described power supply input connector is connected with each carrier module, be connected with each carrier module after described higher level's routing node connector publishes in instalments ripple signal coupler, described subordinate routing node connector is through carrier signal electronic switch, be connected with each carrier module after carrier signal programmable attenuator and carrier signal coupler, described carrier signal programmable attenuator and carrier signal electronic switch are connected with the single-chip microcomputer of on circuit substrate by control line.
Preferably, described power module is DC power supply.
Preferably, described carrier signal coupler by the electric capacity of two 0.1uF, one of them capacity earth.
Preferably, 4 electronic switches that carrier signal programmable attenuator comprises 4 grades of carrier signal attenuator circuits and is connected with every grade of carrier signal attenuator circuit respectively, a described electronic switch controls the break-make of first carriers signal attenuation circuit.
Preferably, described every one-level carrier signal attenuator circuit is ∏ type resistance attenuation circuit.
Preferably, described electronic switch is by electric capacity C259, C260, resistance R219, R221, R222, switching diode D2 and triode Q2 forms, wherein, power supply is connect after the positive pole connecting resistance R219 of described switching diode D2, be connected with the collector electrode of triode Q2 after negative pole connecting resistance R221, be connected with single-chip microcomputer after base stage connecting resistance R222, the grounded emitter of described triode Q2, electric capacity C295 one end ground connection, one termination power, a link of described electronic switch is connected with the positive pole of switching diode D2 after electric capacity C259, another link is connected with the negative pole of switching diode D2 after electric capacity C260, described link is used for being connected with carrier signal attenuator circuit.
Preferably, described carrier signal electronic switch is arranged between described carrier signal attenuator circuit and subordinate's routing node connector, for control carrier signal break-make and and subordinate's networking unit between the break-make of transmission channel.
Preferably, also comprise the Arbitrary Waveform Generator be connected with described processing unit and networking unit, described Arbitrary Waveform Generator is connected with higher level's routing node connector of described networking unit.
Preferably, described carrier module is connected with single-chip microcomputer by row's faller gill mother of 2x6 pin.
Preferably, described carrier module is connected with carrier signal coupler by the double-row faller gill mother of 2x4 pin, 2 pin of described row's mother socket and 7 pin indirect resistance R321,2 pin are connected with 1 pin simultaneously, 7 pin are connected with 8 pin simultaneously, 3-6 pin is empty pin, publishes in instalments the L_PLC end of ripple signal coupler after 1 pin connecting resistance R322, publishes in instalments the N_PLC end of ripple signal coupler after 8 pin connecting resistance R323.
From above technical scheme, pluggable multiple removable carrier module on networking element circuit substrate of the present invention, each carrier module is connected with a single-chip microcomputer, the physical address of carrier module reads in from single-chip microcomputer, carrier module can be convenient for changing, and change any carrier module all can not influential system arrange, the CLIENT PROGRAM such as ammeter, Street lamps control or Smart Home can be write in single-chip microcomputer, do multiple application networking test.And each networking unit being equipped with higher level's routing node connector for being connected with adjacent higher level's routing node by shielded radio frequency line, inputting connector for subordinate's routing node connector of being connected with adjacent subordinate routing node by shielded radio frequency line and power supply, the built-in programmable attenuator that the carrier communication mode of self can be utilized to control of networking unit, pad value size and carrier signal route direction between each communication node can be controlled, realize the networking of computer self adaptation.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention, simple introduction is done below by the accompanying drawing used required in embodiment or description of the prior art, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structured flowchart of the embodiment of the present invention;
Fig. 2 is the structured flowchart of networking unit of the present invention;
Fig. 3 is the circuit diagram of embodiment of the present invention single-chip microcomputer;
Fig. 4 is the circuit diagram of the double socket of 2x4 pin;
Fig. 5 is the circuit diagram of the double socket of 2x6 pin;
Fig. 6 is the circuit connection diagram of subordinate's routing node connector;
Fig. 7 is the circuit diagram of electronic switch;
Fig. 8 is the circuit connection diagram of higher level's routing node connector;
Fig. 9 is the circuit connection diagram of power supply input connector.
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in more detail.
Embodiment
As shown in Figure 1, the networking test macro of the power wire broadband carrier communication module of the present embodiment comprises power module 1, broadband power line carrier routing module 2, processing unit 3 and at least one networking unit 4.Be connected by data line between broadband power line carrier routing module 2 with processing unit 3, the data line adopted can be the netting twines such as twisted-pair feeder, coaxial cable, optical fiber, and processing unit 3 of the present invention is computer.Broadband power line carrier routing module 2 is as networking host node, and it is connected with a networking unit 4 by shielded radio frequency line, and the networking unit 4 that should be connected with broadband power line carrier routing module 2 is again by shielded radio frequency line and the unit cascaded networking of other networking.Broadband power line carrier routing module 2 is low pressure broadband power line carrier communication unit, this low pressure broadband power line carrier communication unit is product sold on market, and it meets the requirement of terminal communication unit in GB Q-GDW 1379.4-2013 power user power consumption information acquisition system inspection technology specification the 4th part (communication unit inspection technology specification).Power module 1 is connected with networking unit 4, for networking unit 4 is powered, power module 1 of the present invention adopts DC power supply, and the interchange of 12V specifically can be selected to turn direct-current switch power supply, and in the present embodiment, power module 1 is that four networking unit are powered by shielded radio frequency line.
The present invention can arrange multiple networking unit 4, and the structure of each networking unit 4 is all identical, is connected between networking unit 4 by shielded type cable.With reference to Fig. 2, networking unit 4 comprises carrier signal programmable attenuator 4-1, carrier signal coupler 4-2, several carrier module 4-3, circuit substrate 4-4, carrier signal electronic switch 4-5, radio frequency connector 4-6 and metal shell (not shown), wherein, carrier signal programmable attenuator 4-1, carrier signal coupler 4-2, carrier module 4-3, carrier signal electronic switch 4-5, radio frequency connector 4-6 are all arranged on circuit substrate 4-4, circuit substrate 4-4 is arranged in metal shell, to block Space Coupling between node.Radio frequency connector 4-6 of the present invention comprises power supply input connector 4-6a, higher level's routing node connector 4-6b and subordinate routing node connector 4-6c, power supply input connector 4-6a is connected with power module 1, power supply input connector 4-6a is connected with each carrier module, for each carrier module provides DC power supply by shielded radio frequency line.Be connected by holding wire between adjacent carrier module 4-3, carrier module 4-3 is connected with circuit substrate 4-4 by row's faller gill mother (connector).Higher level's routing node connector 4-6b is used for being connected with adjacent higher level's routing node (networking unit) by shielded radio frequency line, is connected after higher level's routing node connector 4-6b publishes in instalments ripple signal coupler 4-2 with each carrier module 4-3.Subordinate routing node connector 4-6c is used for being connected with adjacent subordinate routing node (networking unit) by shielded radio frequency line, and subordinate routing node connector 4-6c is connected with each carrier module 4-3 after carrier signal electronic switch 4-5, carrier signal programmable attenuator 4-1 and carrier signal coupler 4-2.Carrier signal programmable attenuator 4-1 and carrier signal electronic switch 4-5 is connected with the single-chip microcomputer of on circuit substrate by control line, and this single-chip microcomputer can control the operating state of carrier signal programmable attenuator 4-1 and carrier signal electronic switch 4-5.Higher level's routing node connector 4-6b in the present embodiment and subordinate routing node connector 4-6c is two.Processing unit controls the carrier signal programmable attenuator that is arranged in networking unit and carrier signal electronic switch by carrier communication, thus can control pad value size and carrier signal route direction between each communication node, realizes computer program-control flexible networking.
The present embodiment circuit substrate 4-4 is provided with 15 carrier module 4-3 and the single-chip microcomputer corresponding with carrier module quantity (not shown), a single-chip microcomputer on each carrier module connecting circuit substrate, be in 15 single-chip microcomputers one for controlling the single-chip microcomputer of carrier signal programmable attenuator on subordinate's routing node connector and carrier signal electronic switch, the present embodiment Zhong Youliangge subordinate routing node connector, just has two for the single-chip microcomputer controlling carrier signal programmable attenuator and carrier signal electronic switch.The model of the present embodiment single-chip microcomputer is R5F21284 (Fig. 3), reads in single-chip microcomputer address as Self address after carrier module powers on.Carrier module by row faller gill mother be connected with circuit substrate, can carrier module be convenient for changing, and change any carrier module all can not influential system setting; If single-chip microcomputer write electric energy meter DL/T645 interface protocol, then application of can checking meter, single-chip microcomputer also can write the CLIENT PROGRAM such as Street lamps control or Smart Home, does the networking test of multiple application.
As shown in Figure 4 and Figure 5, row's mother socket of the present embodiment adopts the XS5 socket of 2x4 pin and the XS6 socket of 2x6 pin, each pin of row's faller gill mother defines about the requirement of communication carrier module pin definitions by Q-GDW 1355-2013 single-phase intelligent electric energy meter pattern specification annex F, carrier module is connected with single-chip microcomputer by XS6 socket, is connected with carrier signal coupler by XS5 socket.As a preferred technical scheme, 2 pin of the XS5 socket of 2x4 pin and 7 pin indirect resistance R321, 2 pin are connected with 1 pin simultaneously, 7 pin are connected with 8 pin simultaneously, 3-6 pin is empty pin, the L_PLC end of ripple signal coupler is published in instalments after 1 pin connecting resistance R322, the N_PLC end of ripple signal coupler is published in instalments after 8 pin connecting resistance R323, the resistance R321 be connected with XS5 socket pins, R322, the attenuator circuit that R323 and the R198 (Fig. 9) be connected with the carrier signal coupler of higher level's routing node connector forms, can be in same networking unit and provide suitable decay between each carrier module, the Trueattenuation situation of simulation in same ammeter box between each carrier module.
Fig. 6 is the circuit connection diagram of subordinate's routing node connector.In Fig. 6, SMA antenna pedestal J63 is radio frequency connector; D11 is ESD protective device, and electric capacity C252 and C253 of two 0.1uF forms carrier signal coupler, one of them capacity earth; carrier signal is converted into common-mode signal by difference mode signal, so that carrier signal is transmitted by shielded radio frequency line.Carrier signal coupler can accomplish that in 1-30MHz frequency range Insertion Loss is less than 1dB.The carrier signal programmable attenuator of the present embodiment is made up of 4 grades of carrier signal attenuator circuits and 4 electronic switches, every grade of carrier signal attenuator circuit is ∏ type resistance attenuation circuit, as R192, R199, R283 and R200 form a ∏ type resistance attenuation circuit, R200, R201, R284 and R202 form a ∏ type resistance attenuation circuit, R202, R203, R285 and R206 form a ∏ type resistance attenuation circuit, and R198 (Fig. 9), R191, R282 and R192 form a ∏ type resistance attenuation circuit.Composition graphs 7, Fig. 7 is the circuit diagram of electronic switch.Electronic switch is made up of electric capacity C259, C260, resistance R219, R221, R222, switching diode D2 and triode Q2.Wherein, power supply is connect after the positive pole connecting resistance R219 of switching diode D2, be connected with the collector electrode of triode Q2 after the negative pole connecting resistance R221 of switching diode D2, be connected with the I/O port of single-chip microcomputer after the base stage connecting resistance R222 of triode Q2, the grounded emitter of triode Q2, electric capacity C295 one end ground connection, a termination power, the link at1 of electronic switch is connected with the positive pole of switching diode D2 after electric capacity C259, and the link at2 of electronic switch is connected with the negative pole of switching diode D2 after electric capacity C260.Electric capacity C259 and C260 is capacitance, and resistance R219 and R221 provides suitable bias current for switching diode D2.Every grade of carrier signal attenuator circuit all connects with an electronic switch, bypass or the access of carrier signal attenuator circuit is realized by the break-make controlling this electronic switch, the structure of every grade of electronic switch is all identical, as Fig. 6, have at1, at2, at3, at4 and at5 place that 4 electronic switches are connected to 4 grades of carrier signal attenuator circuits successively.Carrier signal electronic switch 4-5 is serially connected in (at5 and at6 place) between carrier signal attenuator circuit and radio frequency connector J63, control carrier signal break-make and and subordinate's routing node between the break-make of transmission channel, carrier signal electronic switch 4-5 is identical with the circuit of the electronic switch of aforementioned control carrier signal attenuator circuit.Single-chip I/O mouth (crt1, crt2, crt3, crt4) carrys out the break-make of control switch diode D2 by the resistance R222 in electronic switching circuit and triode Q2, thus control access or the bypass of carrier signal attenuator circuit, reach the object controlling pad value.Single-chip I/O mouth (crt5) carrys out the break-make of control switch diode D2 by the resistance R222 in carrier signal electronic switching circuit and triode Q2, thus control the break-make of the transmission channel between upper and lower level routing node, reach the object controlling carrier signal route direction.The pad value of adjacent the superior and the subordinate networking unit carrier signal is controlled by the programmable attenuator that higher level's networking unit is built-in.
As shown in Figure 8, Fig. 8 is the circuit connection diagram of higher level's routing node connector.Electric capacity C255 and C256 of two 0.1uF forms carrier signal coupler, one of them capacity earth.D10 is ESD protective device, and SMA antenna pedestal J61 and J62 is radio frequency connector.
With reference to the circuit connection diagram that Fig. 9, Fig. 9 are power supply input connector.SMA antenna pedestal J66 (radio frequency connector) is 12V power input interface, is connected with 12V DC power supply by rf signal line.C219, C220 and C221 are filter capacitor, except playing power filter effect, carrier signal also can be stoped to be gone out by this SMA antenna pedestal conduct radiation.In Fig. 8, D9 is ESD protective device.
Processing unit of the present invention sends out control command to the single-chip microcomputer be connected with carrier signal electronic switch with programmable attenuator by carrier communication, single-chip microcomputer controls to be arranged at the programmable attenuator in networking unit and carrier signal electronic switch by I/O port respectively, thus pad value size and carrier signal route direction between each communication node can be controlled, realize the networking of computer self adaptation.In addition, the Arbitrary Waveform Generator (Fig. 1) be connected with processing unit and networking unit can be set, Arbitrary Waveform Generator one end is connected with processing unit, the other end is connected with higher level's routing node connector of networking unit, by injecting the interference signal of any amplitude, simulate various special on-the-spot applied environment.Processing unit is connected with broadband power line carrier routing module, read the routing iinformation of each carrier module, operate each carrier module reset or on roll off the production line, read electricity and other information, test throughput etc., and record all real time datas, the data analysis collected is arranged, thus set up out different models, for controlling test macro.Computer can adopt LABVIEW or other gui tools to run friendly, patterned human interface software.
Above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, although with reference to above-described embodiment to invention has been detailed description, those of ordinary skill in the field are to be understood that, still can modify to the specific embodiment of the present invention or equivalent replacement, and not departing from any amendment of spirit and scope of the invention or equivalent replacement, it all should be encompassed among right of the present invention.
Claims (10)
1. the power wire broadband carrier communication network module test macro of built-in programmable attenuator, is characterized in that, comprising: power module, broadband power line carrier routing module, processing unit and at least one networking unit; Described processing unit is connected with described broadband power line carrier routing module, described broadband power line carrier routing module is connected with a networking unit by shielded radio frequency line, this networking unit is by shielded radio frequency line and the unit cascaded networking of other networking, described power module is connected with described networking unit, for described networking unit is powered;
Wherein, described networking unit comprises circuit substrate, the carrier signal programmable attenuator be arranged on described circuit substrate, carrier signal coupler, several carrier module, carrier signal electronic switch, radio frequency connector, described circuit substrate is located in metal shell, each carrier module described is connected with a single-chip microcomputer be arranged on circuit substrate, is connected between adjacent carrier module by holding wire, described radio frequency connector comprises the power supply be connected with power module and inputs connector, the higher level's routing node connector be connected with higher level's networking unit and the subordinate's routing node connector be connected with subordinate networking unit, described power supply input connector is connected with each carrier module by shielded radio frequency line, be connected with each carrier module after described higher level's routing node connector publishes in instalments ripple signal coupler, described subordinate routing node connector is through carrier signal electronic switch, be connected with each carrier module after carrier signal programmable attenuator and carrier signal coupler, described carrier signal programmable attenuator and carrier signal electronic switch are connected with the single-chip microcomputer of on circuit substrate by control line.
2. the power wire broadband carrier communication network module test macro of built-in programmable attenuator as claimed in claim 1, is characterized in that: described power module is DC power supply.
3. the power wire broadband carrier communication network module test macro of built-in programmable attenuator as claimed in claim 1, is characterized in that: described carrier signal coupler by the electric capacity of two 0.1uF, one of them capacity earth.
4. the power wire broadband carrier communication network module test macro of built-in programmable attenuator as claimed in claim 1, it is characterized in that: 4 electronic switches that described carrier signal programmable attenuator comprises 4 grades of carrier signal attenuator circuits and is connected with every grade of carrier signal attenuator circuit respectively, a described electronic switch controls access or the bypass of first carriers signal attenuation circuit.
5. the power wire broadband carrier communication network module test macro of built-in programmable attenuator as claimed in claim 4, is characterized in that: described every one-level carrier signal attenuator circuit is ∏ type resistance attenuation circuit.
6. the power wire broadband carrier communication network module test macro of built-in programmable attenuator as claimed in claim 4, it is characterized in that: described electronic switch is by electric capacity C259, C260, resistance R219, R221, R222, switching diode D2 and triode Q2 forms, wherein, power supply is connect after the positive pole connecting resistance R219 of described switching diode D2, be connected with the collector electrode of triode Q2 after negative pole connecting resistance R221, be connected with single-chip microcomputer after base stage connecting resistance R222, the grounded emitter of described triode Q2, electric capacity C295 one end ground connection, one termination power, a link of described electronic switch is connected with the positive pole of switching diode D2 after electric capacity C259, another link is connected with the negative pole of switching diode D2 after electric capacity C260, described link is used for being connected with carrier signal attenuator circuit.
7. the power wire broadband carrier communication network module test macro of built-in programmable attenuator as claimed in claim 1, it is characterized in that: described carrier signal electronic switch is arranged between described carrier signal attenuator circuit and subordinate's routing node connector, for control carrier signal break-make and and subordinate's networking unit between the break-make of transmission channel.
8. the power wire broadband carrier communication network module test macro of built-in programmable attenuator as claimed in claim 1, it is characterized in that: also comprise the Arbitrary Waveform Generator be connected with described processing unit and networking unit, described Arbitrary Waveform Generator is connected with higher level's routing node connector of described networking unit.
9. the power wire broadband carrier communication network module test macro of built-in programmable attenuator as claimed in claim 1, is characterized in that: described carrier module is connected with single-chip microcomputer by row's faller gill mother of 2x6 pin.
10. the power wire broadband carrier communication network module test macro of the built-in programmable attenuator as described in claim 1 or 9, it is characterized in that: described carrier module is connected with carrier signal coupler by the double-row faller gill mother of 2x4 pin, 2 pin of described row's mother socket and 7 pin indirect resistance R321,2 pin are connected with 1 pin simultaneously, 7 pin are connected with 8 pin simultaneously, 3-6 pin is empty pin, publish in instalments the L_PLC end of ripple signal coupler after 1 pin connecting resistance R322, after 8 pin connecting resistance R323, publish in instalments the N_PLC end of ripple signal coupler.
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| CN105939164B (en) * | 2016-06-06 | 2018-07-20 | 珠海慧信微电子有限公司 | Bandwidth carrier single-phase module test device |
| CN107342790A (en) * | 2017-08-11 | 2017-11-10 | 珠海慧信微电子有限公司 | A kind of drawer type power wire broadband carrier communication network module test system |
| CN107342790B (en) * | 2017-08-11 | 2023-04-18 | 珠海慧信微电子有限公司 | Networking test system for drawer type power line broadband carrier communication module |
| CN107346994A (en) * | 2017-09-08 | 2017-11-14 | 武汉盛帆电子股份有限公司 | Bandwidth carrier automatization test system and relaying series method of testing |
| CN107346994B (en) * | 2017-09-08 | 2023-09-08 | 武汉盛帆电子股份有限公司 | Broadband carrier automatic test system and relay level number test method |
| CN108964704A (en) * | 2018-07-24 | 2018-12-07 | 南方电网科学研究院有限责任公司 | Broadband power line carrier communication channel research method, device and storage medium |
| CN108964704B (en) * | 2018-07-24 | 2022-04-29 | 南方电网科学研究院有限责任公司 | Broadband power line carrier communication channel research method, device and storage medium |
| CN109302213A (en) * | 2018-10-23 | 2019-02-01 | 国网天津市电力公司电力科学研究院 | A kind of broadband programmable attenuator for power carrier communication |
| CN110932761A (en) * | 2019-12-12 | 2020-03-27 | 国网湖北省电力有限公司计量中心 | Power line broadband carrier attenuator |
| CN110932761B (en) * | 2019-12-12 | 2021-05-25 | 国网湖北省电力有限公司计量中心 | Power line broadband carrier attenuator |
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