CN1564475A - Multi-speed hybrid power line broadband access system and relay thereof - Google Patents
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Abstract
The disclosed system includes following devices and connections: leading end device connected to Internet receives data signal and modulates the data signal to first carrier signal at first transmission speed in first frequency range; the leading end device is also connected to power line to transfer first carrier signal; repeaters includes terminal units connected to power line, and bridge, which connects with terminal units and power line; terminal unit receives first carrier signal from the leading end device, modulates the received first carrier signal to data signal, and sends the data signal though data line to bridge. Bridge modulates the data signal to second carrier signal at second transmission speed in second frequency range in order to transfer second carrier signal through power line. The invention is also discloses suitable repeater.
Description
Technical field
The present invention relates to a kind of communication system, particularly a kind of system and repeater thereof that carries out high-speed communication by power line.
Background technology
Power line communication technology (Power Line Communication Technology) is called for short PLC or PLT (being designated hereinafter simply as PLC), is meant a kind of communication mode that utilizes power line transmission data and voice signal.Power line communication is not any new technology, the developing history that arranged decades, going up by the lower frequency of electric wave carrier utilization (9-490kHz) to transmit remote action data or speech than low rate at mesohigh power transmission network (more than the 35kV), is exactly one of principal mode of using of power line communication technology.Deep day by day along with domestic town and country power distribution network retrofit work, many manufacturers begin the distribution carrier terminal equipment that development is used for the communication of pressure (10kV) power distribution network, and message transmission rate can reach 1200bps.In low pressure (220V) field, the PLC technology at first is used to load control, remote meter reading and household automation, and its transmission rate is generally 1200bps or lower, is called low speed PLC.The power line communication technology of low-voltage power line transmission rate more than 1Mbps of carrying out both at home and abroad in recent years that utilize is referred to as high speed PLC.
In recent years, along with the develop rapidly of Internet technology, the number of logon is doubled and redoubled.Yet, adopt which kind of communication mode to make user terminal be connected to nearest broadband network connection device, becoming one of difficult point of long-term puzzlement people, also is one of universal bottleneck of Internet, is called " last kilometer " problem that broadband network inserts by the insider.Utilization extend in all direction, spread all over town and country, through user 220V low-voltage power line transmitting high speed data the PLC technology with its need not wiring, wide coverage, distinguishing feature easy to connect, thought to provide one of the most competitive technology of " last 300 meters " solution by the insider.High speed PLC can transmit the data up to 45Mbps at present, and can transmit data, voice, video and electric power simultaneously, might bring the new trend of " four networks one platform ".
Compare with other communication modes, high speed PLC has following advantage.
1) making full use of existing low voltage power distribution network infrastructure, need not any wiring, is a kind of " No New Wires " technology, has saved resource.Need not ditching, need not through walls burrowing, avoided destruction, also saved manpower simultaneously building and public utility.
2) can be for the user provide high-speed the Internet access service, IP voice service, thus the user is surfed the Net and make a phone call to increase new selection, help other telco provider and improve service, reduce price.
3) home networking is provided support, the family's sound, the video network that people can be enjoyed bring by the PLC technology, many people resist amusements such as recreation.
4) be the fresh combatants of household automation, intelligent appliance networked, enjoy the comfortable and convenient of digitized home in advance by the wall plug that spreads all over each room.
5) utilize the permanent online connection of PLC, the guard monitor system of the fire prevention of structure, antitheft, anti-toxic gas leakage etc. allows the working clan sleep without any anxiety; The medical first aid system that makes up allows house have old man, child and patient's family to feel more convenient.
6) remote auto is read water, electricity, gas table data, makes utility company save a large amount of expenses, has also made things convenient for the user.
7) load is controlled, the new tool of dsm for Utilities Electric Co. provides, and improves Utilities Electric Co.'s managerial skills.
8) make Utilities Electric Co. just can enter telecommunications service markets such as ISP, ICP and speech, become new profit growth point with extremely low investment.Utilities Electric Co. can be that the user provides telecommunications service with cheap price, and is more competitive on telecommunication market.
9) realize " four networks one platform ", create huge economic and social benefit.
The Norweb communication company of subsidiary of Britain United Power Company began electric line carrier communication is studied in nineteen ninety.Nineteen ninety-five, the said firm unites with Canadian Nortel (Nortel Networks) company again, develops this new technology jointly.1995～1997 years two in the period of, Norweb and Nortel company successfully test 20 residents at Manchester, England, comprising voice service.In October, 1997, problems such as having solved power noise is claimed by this two company, obtained the important breakthrough of power line carrier technology, utilize digital power line ZAP DPL (Digital Power Line newly developed, the digital power line) realized on low-voltage network, carrying out the telecommunication of 1Mbps, thereby the power line that will extend in all direction is converted into information superhighway.On March 25th, 1998, set up the NOR.WEB of co-partnership company, carry out the marketing of this technology.
Hereafter, the research institution of many countries has carried out high speed power line Study on Technology and exploitation, Intellon, Inari (Intelogis) company as the U.S., the ITRAN of Israel, Main.Net company, the Xeline company of Korea S, the ASCOM company of Switzerland, the Polytrax company of Germany, Hispanic DS2 company etc., the transmission rate of product also develops into 2Mbps, 14Mbps, 24Mbps from 1Mbps, even 45Mbps.
45Mbps high speed power line communication system is the PLC system that transmission rate is the highest in the world at present, networking by the main frame (abbreviation headend) that is positioned at distribution transformer, the repeater (being called for short HG) that is used for signal amplification and regeneration and terminal (being called for short CPE) equipment, basically can satisfy the online high-speed data transmission of Information of low-voltage power in the same distribution transforming transformer scope, and high speed access services such as High Speed I nternet visit, IP phone, video request program, online game, online chat, shopping online are provided.
The networking principle of 45Mbps system is: the whole frequency of 2～38MHz is divided into Link1, Link2, Link3, Link4 totally 4 frequency ranges uses, and the frequency range of each frequency range is 6.3MHz, and the user can use 1 band transmissions data wherein.Frequency segmentation is used, be convenient to carry out signal relay, have certain superiority.But the middle discovery of installing and using at the scene, the interference that produces in vertical trunk power line channel is less relatively, and the interference in the power line channel concentrates in a certain frequency range that 45Mbps uses easily when laterally registering one's residence, and causes communication performance variation between user side and the main website.And the 14Mbps system of American I ntellon company exploitation, use 4～20MHz frequency range to carry out transfer of data, frequency range is up to 16MHz, general interference source can only influence the wherein transfer of data of a part of frequency range, remaining other frequency ranges still can be supported communicating by letter of user side and main website, so have certain advantage in 100 meters the user's access in the end of 14M power line high-speed communication system.But owing to use frequency range wide, this system can't realize remote relay transmission.Like this, these two system's mixed networking being used, learnt from other's strong points to offset one's weaknesses, is highly significant.
In addition, the 45Mbps chip price is higher, and is too high based on the cost of the 45Mbps power line high-speed communication system of DS2 chip.Consider the ability to take the burden of the present broadband access network equipment expenditure of China family, the Internet of most of sub-district outlet only can provide the 10Mbps bandwidth in addition, uses the 45Mbps system directly to register one's residence, both can not be also unnecessary.
Based on above-mentioned cost and 45Mbps and 14Mbps system separately pluses and minuses consider, we researched and developed collect 45Mbps and 14Mbps system advantage in high speed PLC mixed networking system.The mixed networking mode has reduced system cost effectively, and certain advantage is arranged on the ratio of performance to price, more meets the national conditions that China PLC technology popularization is used.
Summary of the invention
In the residential building that is inserted, the present invention uses the 45Mbps system as vertical trunk, realize the sub-district distribution transformer to the communication between each floor of building, bring into play the advantage of system management that this system has, frequency division multiplexing, multistage relaying, realize the remote relaying of signal; The 14Mbps system is used for the horizontal access of floor to subscriber household inside, makes full use of it and adapts to electrical network ability characteristics strong, with low cost.Many speed mixed access system has significantly reduced the use amount of expensive 45Mbps system terminal equipment, has improved the ratio of performance to price of adaptive capacity, noise resisting ability and system to power network fluctuation.
Overlapped at two employed frequencies of system, the diverse problem of technical system and network configuration, this many speed mixed access system has solved that two system frequencies are multiplexing, the high-frequency signal coupling and continue, key issue such as data link, finely realized two integrated applications of system in same power distribution network.
45Mbps power line high-speed communication system and 14Mbps power line high-speed communication system are two kinds of diverse PLC systems.All there is very big difference from networking structure in control (MAC) layer from the physical layer to media interviews to using.
Networking in physical layer and two high speed PLC systems of MAC layer realization because frequency range is overlapping and the difference of MAC layer, directly can not realize two high speed PLC system mixed networking.Therefore, directly can not realize mixed networking between these two PLC systems by the interconnection between the modulation equipment of two PLC systems.
On the physical carrier passage, because the sharing characteristic of the low-voltage distribution network channel of carry high frequency carrier signal, use different high speed PLC systems on the net simultaneously at same low-voltage distribution, inevitable mutual conflict interferes with each other and cisco unity malfunction owing to the overlapping of frequency range.The way that solves this problem is to use frequency division multiplexing (FDM) technology, and promptly two or more different high speed PLC systems use different carrier wave frequency ranges respectively, shares same low-voltage distribution network channel and does not produce conflict mutually.
To achieve these goals, according to a first aspect of the invention, at this power line connecting system that provides a kind of many speed to mix, comprising: headend, it is connected with the Internet and receives data-signal from the Internet, is this data signal modulation the first carrier signal that has first message transmission rate in first frequency range, and described headend is also connected to power line and by this first carrier signal of described power line transmission; Repeater, comprising terminal equipment that is connected with power line and the bridge that is connected and is connected with described terminal equipment by data wire with described power line, described terminal equipment receives the first carrier signal from described headend, it is demodulated into data-signal, by this data wire described data-signal is sent to described bridge, described bridge is this data signal modulation second carrier signal that has second transmission rate in second frequency range, and described second carrier signal is passed through power line transmission.
According to a second aspect of the invention, at this power line connecting system that provides a kind of many speed to mix, comprising: headend, it is connected with the Internet and receives data-signal from the Internet, is this data signal modulation the first carrier signal that has first message transmission rate in first frequency range, and by this first carrier signal of power line transmission; First repeater, it is connected to power line and receives by the first carrier signal of power line from headend, to this first carrier signal amplify and be modulated to nonoverlapping second frequency range of first frequency range in have second carrier signal of described first message transmission rate, then by described second carrier signal of described power line transmission; Second repeater, comprising terminal equipment that is connected with power line and the bridge that is connected and is connected with described terminal equipment by data wire with described power line, described terminal equipment receives described second carrier signal, it is demodulated into data-signal, by this data wire described data-signal is sent to described bridge, described bridge is this data signal modulation the 3rd carrier signal that has second transmission rate in the 3rd frequency range, then described the 3rd carrier signal by described power line transmission.
According to a third aspect of the present invention, provide a kind of repeater that is used to connect the power line connecting system of different rates at this, comprising: terminal equipment, it is connected with power line, reception is demodulated into data-signal to it and passes through this data wire output from the first carrier signal in first frequency range of the power line connecting system of first rate; Bridge, it is connected with described terminal equipment by data wire and is connected with described power line, and receive data-signal from terminal equipment, is described data signal modulation second carrier signal that has second transmission rate in second frequency range, then described second carrier signal by the power line connecting system of power line transmission to second speed.
Description of drawings
Below in conjunction with description of drawings the preferred embodiments of the present invention, wherein:
Fig. 1 is the schematic diagram that repeater used in the power line broadband access system of the present invention is shown;
Fig. 2 is the circuit diagram that low pass filter used in the power line broadband access system of the present invention is shown;
Fig. 3 is the test curve figure of the decay-frequency characteristic of the low pass filter shown in Fig. 2;
Fig. 4 is the circuit diagram that high pass filter used in the power line broadband access system of the present invention is shown;
Fig. 5 is the test curve figure of the decay-frequency characteristic of the high pass filter shown in Fig. 4;
Fig. 6 illustrates the power line broadband access system that many speed of the present invention is mixed.
Embodiment
In general, the employed frequency range of low-voltage power line high speed PLC system is 1～38MHz, and 45Mbps power line high-speed communication system and 14Mbps power line high-speed communication system have bigger lap on frequency.45Mbps power line high-speed communication system is divided into 3 frequency ranges with whole frequency, can be implemented in the frequency division relaying in the whole system; In like manner, in 14Mbps power line high-speed communication system, also can use same principle whole frequency is divided into two frequency ranges up and down, be respectively 4.6MHz～13MHz and 13MHz～20.7MHz, so, not only can in 14Mbps power line high-speed communication system, realize intrasystem frequency division relaying, also can and 45Mbps power line high-speed communication system realize frequency division relaying between two systems.
PLC system and equipment thereof are a kind of data transmission systems that realizes that the express network data insert.For data terminal equipment (as PC, the network equipment etc.), PLC equipment is the data transmission set of a signal from the digital to analogy modulation, it provides the data-interface (as meeting the IEEE802.3 ethernet standard) of the universal standard to the data terminal equipment, and the packet of the ethernet frame format that data terminal equipment is come carries out being modulated to carrier channel after MAC layer and the physical layer packing; Carry out opposite process at the PLC of opposite end equipment, with demodulation and the packet of the ethernet frame format after unpacking (transparent) be transferred to data terminal equipment.Like this, on data link layer, because high speed PLC equipment to the transparent transmission of data terminal equipment packet, can be realized the transfer of data of different PLC systems and equipment thereof on this interface.
By top analysis and research as seen, transform from data link layer and physical-layer carrier passage respectively and develop the mixed networking that just can realize between two PLC systems.Be corresponding techniques scheme and realization below:
1. repeater
On data link layer, link to each other with the EPLC-14ME Ethernet bridge equipment of 14Mbps power line high-speed communication system, can realize the transmission of network packet with the cpe device of direct-connected RJ45 Ethernet connecting line with 45Mbps power line high-speed communication system.
As shown in fig. 1, the schematic diagram of used repeater 1 in the power line broadband access system of the present invention shown in it.This repeater 1 is connected the PLC system of two different rates.Fig. 1 left side is the high speed power line communication system of 45Mps, and wherein cpe device 11 is used terminals in the conventional 45Mps high speed power line communication system, is used as the part of repeater 1 in the present invention, and it comprises an Ethernet interface 14.The right side of Fig. 1 is a kind of 14Mps high speed power line communication system, wherein 14M bridge 12 is a used Ethernet bridge equipment in the 14Mps of routine high speed power line communication system, can use EPLC-14ME to realize, it is used for the carrier signal that is converted to 14Mps from the data-signal of Ethernet interface 15, and this carrier signal is sent to each terminal use at power line 2.In the present invention, this 14M bridge 12 is used as the part of repeater 1, is connected with the Ethernet interface 14 of cpe device 11 through Ethernet connecting line 16 by Ethernet interface 15, is used to transmit the data-signal of IP form.Thereby two relayings of high speed PLC system on data link layer have been realized.This relaying looks like two back-to-back connections of modulation equipment, can be called repeater back-to-back.From logic networking angular area branch, these two high-speed modulate and demodulate equipment (cpe device and EPLC-14ME equipment) adhere to two high speed PLC systems separately.
2. line filter
On physical layer, realize that the nothing conflict relaying of two different high speed PLC systems connects, just must on the physical-layer carrier frequency, adopt frequency division multiplexing (FDM) technology.Promptly two different high speed PLC systems use the frequency range of no frequency overlap respectively, and the relaying that is implemented on the same power distribution network power line connects and mixed networking.
45Mbps power line high-speed communication system itself has been used the networking mechanism that frequency division multiplexing (FDM) technology realizes relaying, thereby, when itself and 14Mbps power line high-speed communication system are realized the relaying mixed networking, only need the equipment of 14Mbps power line high-speed communication system is carried out the segmentation improvement of frequency, so that these two high speed PLC systems realize not having conflict relaying mixed networking.
Like this, the key of realization is the design and the realization of line filter, so that 14Mbps power line high-speed communication system and the employed frequency of equipment are carried out segmentation.The present invention increases a filter 17 in the junction of 14M bridge 12 and power line 2 and carries out filtering for this reason.
1) 14Mbps power line high-speed communication system FDM scheme in the mixed networking
The frequency that 14Mbps power line high-speed communication system uses is 4.6MHz～20.7MHz, and it is divided into last two frequency ranges, i.e. 4.6MHz～13MHz (L down
Down) and 13MHz～20.7MHz (L
On), following frequency range only with the L1 frequency range of 45Mbps power line high-speed communication system have overlapping, and with L2, L3 frequency range zero lap, descend frequency range to make the mixed networking relaying like this with L2, L3 frequency range; Equally, super band can be made the mixed networking relaying with L1, L3 frequency range.
2) design of low pass filter
A kind of fc=11MHz of design, the low-pass filter circuit of fs=13MHz are as shown in Figure 2.
This L-C low pass filter 3dB cut-off frequency is 11MHz, the decay at the 13MHz place 〉=-40dB.With the decay-frequency characteristic of sweep generator test shown in Fig. 3 curve.The Test input signal level is 0dB, from test curve as seen, and with designing requirement index basically identical.
3) design of high pass filter
A kind of fc=13MHz of design, the circuit of high pass filter of fs=11MHz are as shown in Figure 4.
As seen from Figure 4, this L-C high pass filter 3dB cut-off frequency is 13MHz, the decay at the 11MHz place 〉=-40dB.With the decay-frequency characteristic of sweep generator test shown in Fig. 5 curve.The Test input signal level is 0dB, from test curve as seen, and with designing requirement index basically identical.
3) realization of mixed networking system
Repeater that application is introduced above and frequency division multiplexing principle can realize 45Mbps power line high-speed communication system and the 14Mbps power line high-speed communication system mixed networking at same low-voltage network.
In the mixed networking system, the operable frequency range of 45Mbps power line high-speed communication system has L1, L2,3 frequency ranges of L3; And 14Mbps power line high-speed communication system only has been under the L, the division of L last two frequency ranges.
In order to strengthen the validity of mixed networking system, the systematic function of better utilization 45Mbps power line high-speed communication system and 14Mbps power line high-speed communication system, the mixed networking scheme as key access network, is used its broadband high-speed performance and perfect Network Management Function thereof with 45Mbps high speed PLC system; Adopt 14Mbps power line high-speed communication system and insert part the user, 14Mbps high speed PLC system communication ability is strong, and the equipment volume low power consumption is low, is applicable to user terminal, and a kind of mixed networking system of practical application as shown in Figure 6.
In Fig. 6, the Internet 3 is connected with router four by netting twine, router four is connected with the headend 5 of 45Mbps system by netting twine, headend 5 is converted to the IP data-signal from router four carrier signal that is adapted at transmission on the power line 2 in frequency range L1 and outputs to power line 2, HG 6 in the 45Mbps system also is connected to power line 2, and receiving the frequency range of being sent by headend 5 is the carrier signal of L1, the carrier signal of then this carrier signal relaying being amplified and being modulated to the L3 frequency range continues to be transferred to repeater 1 on power line 2, the cpe device 11 in the repeater 1 receives from the carrier signal of HG 6 and it is demodulated into the IP data-signal and is sent to 14M bridge 12 in the repeater 1 by Ethernet connecting line 16.Note that the Internet 3 shown in Fig. 6, router four, headend 5, HG 6 and cpe device 11 constitute the 45Mbps systems, is 45Mbps in the speed of frequency range L1, L3 and Ethernet connecting line 16 transmitting datas.L1 and L3 are two used in the 45Mbps system nonoverlapping frequency ranges, and the carrier signal of transmitting on these frequency ranges can the phase mutual interference.
Although above invention has been described, foregoing description is that those of ordinary skills can not break away from the various changes of spirit of the present invention to it for illustrative purposes.For example the HE among Fig. 65 can be omitted, thereby L1 and L3 frequency range are combined into a frequency range, in 14M bridge 12, can use high pass filter or low pass filter to come data signal modulation in different frequency ranges in addition, if 14M bridge 12 the use low pass filter data signal modulation at L
DownIn the frequency range, then 45Mbps power line high-speed communication system should select for use with this L under nonoverlapping L2 of frequency range and L3 frequency range.Therefore, protection scope of the present invention should be limited by the accompanying Claim book and be not limited to above-mentioned specific descriptions in conjunction with the accompanying drawings.
Claims (20)
1. the power line connecting system that mixes of speed more than one kind, comprising:
Headend (5), it is connected with the Internet (3) and receives data-signal from the Internet (3), is this data signal modulation the first carrier signal that has first message transmission rate in first frequency range, and described headend (5) is also connected to power line (2) and transmits this first carrier signal by described power line (2);
Repeater (1), comprising terminal equipment (11) that is connected with power line (2) and the bridge (12) that is connected and is connected with described terminal equipment (11) by data wire (16) with described power line (2), described terminal equipment (11) receives the first carrier signal from described headend (5), it is demodulated into data-signal, by this data wire (16) described data-signal is sent to described bridge (12), described bridge (12) is this data signal modulation second carrier signal that has second transmission rate in second frequency range, and described second carrier signal is transmitted by power line (2).
2. system according to claim 1 is characterized in that, described first message transmission rate is greater than described second message transmission rate.
3. system according to claim 1 is characterized in that, described first frequency range and described second frequency range are not overlapping.
4. according to claim 1 or 3 described systems, it is characterized in that described bridge (12) is connected with power line (2) by filter.
5. system according to claim 4 is characterized in that, described filter is a low pass filter.
6. system according to claim 4 is characterized in that, described filter is a high pass filter.
7. system according to claim 1 is characterized in that, wherein said headend (5) is connected with the Internet (3) by router (4).
8. system according to claim 1 is characterized in that the signal processing of each device in the described system and directions of signal flow are reversible.
9. system according to claim 1, wherein said second frequency range is 4.6MHz～13MHz or 13MHz～20.7MHz.
10. the power line connecting system that mixes of speed more than one kind, comprising:
Headend (5), it is connected with the Internet (3) and receives data-signal from the Internet (3), is this data signal modulation the first carrier signal that has first message transmission rate in first frequency range, and transmits this first carrier signal by power line (2);
First repeater (6), it is connected to power line (2) and receives by the first carrier signal of power line (2) from headend (5), to this first carrier signal amplify and be modulated to nonoverlapping second frequency range of first frequency range in have second carrier signal of described first message transmission rate, then by described second carrier signal of described power line (2) transmission;
Second repeater (1), comprising terminal equipment (11) that is connected with power line (2) and the bridge (12) that is connected and is connected with described terminal equipment (11) by data wire (16) with described power line (2), described terminal equipment (11) receives described second carrier signal, it is demodulated into data-signal, by this data wire (16) described data-signal is sent to described bridge (12), described bridge (12) is this data signal modulation the 3rd carrier signal that has second transmission rate in the 3rd frequency range, then described the 3rd carrier signal is transmitted by described power line (2).
11. system according to claim 10 is characterized in that, described first message transmission rate is greater than described second message transmission rate.
12. system according to claim 10 is characterized in that the signal processing of each device in the described system and directions of signal flow are reversible.
13. system according to claim 10, wherein said second frequency range is 4.6MHz～13MHz or 13MHz～20.7MHz.
14. a repeater that is used to connect the power line connecting system of different rates, comprising:
Terminal equipment (11), it is connected with power line (2), receives the first carrier signal in first frequency range from the power line connecting system of first rate, and it is demodulated into data-signal and passes through this data wire (16) output;
Bridge (12), it is connected with described terminal equipment (11) by data wire (16) and is connected with described power line (2), and receive data-signal from terminal equipment (11), is described data signal modulation second carrier signal that has second transmission rate in second frequency range, then described second carrier signal is transferred to the power line connecting system of second speed by power line (2).
15. repeater according to claim 14 is characterized in that described first rate is higher than described second speed.
16. repeater according to claim 14 is characterized in that, described first frequency range and described second frequency range are not overlapping.
17., it is characterized in that described bridge (12) is connected with power line (2) by filter according to claim 14 or 15 described repeaters.
18. repeater according to claim 17 is characterized in that, described filter is a low pass filter.
19. repeater according to claim 17 is characterized in that, described filter is a high pass filter.
20. repeater according to claim 14 is characterized in that the signal processing of each device in the described system and directions of signal flow are reversible.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102025148A (en) * | 2009-09-14 | 2011-04-20 | 康舒科技股份有限公司 | Power-line network system with data relay function |
| CN102742115A (en) * | 2010-01-13 | 2012-10-17 | 松下电器产业株式会社 | Electric power supply device and vehicle charge system |
| CN105306101A (en) * | 2015-08-07 | 2016-02-03 | 厦门华方软件科技有限公司 | Middle-long distance power line carrier communication system |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1081412C (en) * | 1996-07-22 | 2002-03-20 | 张会庭 | Digital multiplexing telophone channels over power transmission line and integrated information transmission system |
| CN1245803C (en) * | 2001-08-07 | 2006-03-15 | 许继集团有限公司 | Single-double-path modulation and demodulation method, and singl-double-path modem thereof |
-
2004
- 2004-03-23 CN CNB2004100062803A patent/CN100508417C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102025148A (en) * | 2009-09-14 | 2011-04-20 | 康舒科技股份有限公司 | Power-line network system with data relay function |
| CN102742115A (en) * | 2010-01-13 | 2012-10-17 | 松下电器产业株式会社 | Electric power supply device and vehicle charge system |
| JP5654495B2 (en) * | 2010-01-13 | 2015-01-14 | パナソニックＩｐマネジメント株式会社 | Power supply device and vehicle charging system |
| CN102742115B (en) * | 2010-01-13 | 2015-01-21 | 松下电器产业株式会社 | Electric power supply device and vehicle charge system |
| US9300362B2 (en) | 2010-01-13 | 2016-03-29 | Panasonic Intellectual Property Management Co., Ltd. | Power supply apparatus and vehicle charging apparatus |
| CN105306101A (en) * | 2015-08-07 | 2016-02-03 | 厦门华方软件科技有限公司 | Middle-long distance power line carrier communication system |
| CN105306101B (en) * | 2015-08-07 | 2018-03-30 | 厦门华方软件科技有限公司 | A kind of power carrier communication system of medium and long distance |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100508417C (en) | 2009-07-01 |
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