US20140167499A1 - Device for determining a common-mode signal in a power line communication network - Google Patents
Device for determining a common-mode signal in a power line communication network Download PDFInfo
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- US20140167499A1 US20140167499A1 US14/178,003 US201414178003A US2014167499A1 US 20140167499 A1 US20140167499 A1 US 20140167499A1 US 201414178003 A US201414178003 A US 201414178003A US 2014167499 A1 US2014167499 A1 US 2014167499A1
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- pass filter
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
- H04B3/56—Circuits for coupling, blocking, or by-passing of signals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/30—Reducing interference caused by unbalance current in a normally balanced line
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2203/00—Indexing scheme relating to line transmission systems
- H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
- H04B2203/5462—Systems for power line communications
- H04B2203/5466—Systems for power line communications using three phases conductors
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2203/00—Indexing scheme relating to line transmission systems
- H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
- H04B2203/5462—Systems for power line communications
- H04B2203/5483—Systems for power line communications using coupling circuits
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Power Engineering (AREA)
- Dc Digital Transmission (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Small-Scale Networks (AREA)
- Communication Control (AREA)
Abstract
A device for determining a common-mode signal in a power line communication network. The device includes a first line, a second line, and a third line that are connected to a first terminal, to a second terminal, and to a third terminal, respectively. The first, the second, and the third terminal are configured to be connected to a phase line, a neutral line, and a protective ground line of the power line communication network, respectively. The device further includes a common-mode choke configured to couple out the common signal from the first, second, and third line, and the common-mode choke is connected to a termination impedance which is higher than an impedance of the power line communication network.
Description
- This application is a divisional application of U.S. Ser. No. 13/750,454, filed Jan. 25, 2013, which is a continuation of U.S. Ser. No. 13/058,281, filed May 5, 2011, which is a national stage of PCT Application No. PCT/EP2009/003302, filed May 8, 2009, and claims the benefit of priority under 35 U.S.C. §119 from European Patent Application 08014781.2, filed Aug. 20, 2008. The entire content of each of the foregoing applications is hereby incorporated by reference herein.
- An embodiment of the invention relates to a device for determining a common-mode signal in a power line communication network.
- Power line communication (PLC), also called mains communication, power line transmission or power line telecommunication (PLT), broadband power line (BPL), power band or power line networking (PLN) is a term describing several different systems for using power distribution wires for simultaneous distribution of data. A carrier can communicate voice and data by superimposing an analog signal of the standard 50 or 60 Hz alternating current (AC). For indoor applications, PLC equipment can use household electrical power wiring as a transmission medium. This is a technique used e.g. for home networking or in home automation for remote control of lighting and appliances without installation of additional wiring.
- In standard PLC systems the signals are transmitted and received in a differential-mode (DM). Differential-mode signaling is a method of transmitting information over pairs of wires. At DM signaling one wire carries signal and the other wire carries the inverse of the signal, so that the sum of the voltages to ground on the two wires is always assumed to be zero. PLC modems therefore inject a DM signal between a neutral line and a phase line of an outlet of the power line network of the household for communication purposes. Another PLC modem can receive such DM signals at another outlet and use the DM signal for controlling an appliance associated with the receiving PLC modem.
- At in-house power line grids, there are asymmetric elements between the phase line and the neutral line, like e.g. an open light switch, a current bar and a fuse cabinet, branches etc. At these asymmetric elements, the DM signals injected by PLC modems are converted to common-mode (CM) signals. Multiple input multiple output (MIMO) PLC modems can use different channels, in particular also common-mode signals, in order to enhance the coverage of PLC systems.
- Therefore, there is need for an improved device for a determining a common-mode signal in a power line communication network.
- It is an object of the invention to provide a device for determining a common-mode signal in a power line communication network with an improved ability to detect common-mode signals.
- This object is solved via device according to
claim 1. - Further details of the invention will become apparent from a consideration of the drawings and ensuing description.
- The accompanying drawings are included to provide a further understanding of embodiments and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments and together with the description serve to explain principles of embodiments. Other embodiments and many of the intended advantages of the embodiments will be readily appreciated, as they become better understood by reference to the following detailed description. The elements of the drawings are not necessarily to scale relative to each other. Like reference numerals designate corresponding similar parts.
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FIG. 1 shows a schematic circuit diagram of an embodiment of the invention, -
FIG. 2 shows a schematic circuit diagram of a further embodiment of the invention, -
FIG. 3 shows a schematic circuit diagram of a further embodiment of the invention, -
FIG. 4 shows a schematic circuit diagram of a further embodiment of the invention, -
FIG. 5 shows a schematic diagram for explaining the reception of multiple-input multiple-output signals with an embodiment of the invention. - In the following, embodiments of the invention are described. It is important to note that all described embodiments in the following may be combined in any way, i.e. there is no limitation that certain described embodiments may not be combined with others. Further, it should be noted that same reference signs throughout the figures denote same or similar elements.
- It is to be understood that other embodiments may be utilized and structural or logical changes may be made without departing from the scope of the invention. The following detailed description, therefore, is not to be taken in a limiting sense, and the scope of the present invention is defined by the appended claims.
- It is to be understood that the features of the various embodiments described herein may be combined with each other, unless specifically noted otherwise.
- In
FIG. 1 a schematic circuit diagram of adevice 100 for determining a common-mode signal in a power line communication network is depicted. Thedevice 100 might be, for instance, a probe in order to determine common-mode ingress in a DM power line system. Thedevice 100 might be as well a part of a power line modem that receives power line signals. - The
device 100 comprises afirst line 102, asecond line 104 and athird line 106 which are connected to afirst terminal 110, to asecond terminal 112 and to athird terminal 114, respectively. A phase line P might be connected to thefirst terminal 110, a neutral line N might be connected to asecond terminal 112 and a protective earth line PE might be connected to thethird terminal 114. - The
device 100 includes a common-mode choke 120 configured to couple out the common-mode signal from thefirst line 102, thesecond line 104 and thethird line 106. - The common-
mode choke 120 is connected to atermination impedance 122 which is higher than an impedance of the power line communication network. The power line communication network comprises all lines and appliances and devices connected to the phase line P, to the neutral line N and to the protective earth line PE. - When using a
termination impedance 122 with high impedance, e.g. higher than an impedance of the power line communication network, DM signals transmitted over the phase line P, the neutral line N and the protective earth line PE and, correspondingly, over thefirst line 102, thesecond line 104 and thethird line 106 are less influenced than by using a termination impedance which is considerably lower, e.g. adapted to an impedance of the power line communication network, e.g. 50 to 150 Ohm. - In
FIG. 2 a schematic circuit diagram of afurther device 200 for determining a common-mode signal is depicted. Thefirst line 102, thesecond line 104 and thethird line 106 are connected to thefirst terminal 110, thesecond terminal 112 and thethird terminal 114 by coupling capacitors C, respectively. The coupling capacitor C serves to isolate thedevice 200 against direct current signal on the phase line P, the neutral line N and the protective earth line PE. - The common-
mode choke 120 is wrapped around thefirst line 102, thesecond line 104 and athird line 106 and connected to atermination impedance 122 which is higher than the impedance of the power line communication network. - The
first line 102 is connected via afirst transformer 202 to ground, thesecond line 104 is connected via asecond transformer 204 to ground and thethird line 106 is connected via athird transformer 206 to ground. Afirst output 212 is connected to the first transformer 202 (impedance), asecond output 214 is connected to the second transformer 204 (impedance) and athird output 216 is connected to the third transformer 206 (impedance). - The
first output 212, thesecond output 214 and thethird output 216 are terminated withtermination impedances first output 212, thesecond output 214, and thethird output 216 are used to provide the differential-mode signals which are present on thefirst line 102, thesecond line 104 and thethird line 106. - A
fourth output 218 is connected to the common-mode choke 120. Thefourth output 218 is configured to provide the common-mode signal present on thefirst line 102, thesecond line 104 and thethird line 106. - The
termination impedance 122 might be realized as an input impedance of an analog-to-digital converter connected to the common-mode choke 120. The input impedance of an analog-to-digital converter might be governed by the gate of a CMOS transistor. The value for such input impedances shall be maximal and can normally be between 1 kΩ and 3 kΩ. - The configuration in
FIG. 2 is also known as a star topology. However, it is also possible to use a triangle topology. - In
FIG. 3 a further schematic circuit diagram of afurther device 300 for determining a common-mode signal is depicted. In thedevice 300 the determination of the differential-mode signals is performed by afirst amplifier 302, asecond amplifier 304 and athird amplifier 306. - One of the inputs of the
first amplifier 302 thesecond amplifier 304 and thethird amplifier 306 is connected to ground. The other input of thefirst amplifier 302 is connected to thefirst line 102 between the common-mode choke 120 and afirst impedance 312. The second input of thesecond amplifier 304 is connected to thesecond line 104 between the common-mode choke 120 and asecond impedance 314. The second input of thethird amplifier 306 is connected to thethird line 106 between the common-mode choke 120 and athird impedance 316. The outputs of thefirst amplifier 302, thesecond amplifier 304 and thethird amplifier 306 are connected to thefirst output 222 to thesecond output 224 and to thethird output 226, respectively. - With these amplifiers it is possible to determine the differential-mode signals on the
first line 102, thesecond line 104 and thethird line 106 at thefirst output 222, thesecond output 224 and thethird output 226. Thefirst amplifier 302, thesecond amplifier 304 and thethird amplifier 306 are arranged in a star topology. However, also in arrangement in a triangle topology is possible. - In
FIG. 4 a measurement setup is depicted to determine the influence of the value of thetermination impedance 122 to the isolation or divergence of the differential-mode signals on thefirst line 102, thesecond line 104 and thethird line 106. Agenerator 400 with a current or voltage source EC and an internal impedance of 50 Ohms further comprises afourth impedance 402 of 75 Ohm common to the phase line P, the neutral line N and the protective earth line PE and afifth impedance 404, asixth impedance 406 and aseventh impedance 407 of 50 Ohm each, wherein thefifth impedance 404 situated is in the phase line P, thesixth impedance 406 is situated in the neutral line N and theseventh impedance 407 is situated in the protective earth line PE. Thus, thegenerator 400 has an assumed differential-mode impedance of 100 Ohm and a common-mode impedance of 150 Ohm (if the terminal of the protective earth line PE is left open). - A verification with the network analyzer showed that in case the
termination impedance 122 is 50 Ohm only, only a small isolation between the signals on thefirst line 102 and thethird line 106 is present. However, the isolation between the differential-mode signals on thedifferent lines - In
FIG. 5 a schematic diagram showing the feeding possibilities and receiving possibilities in a multiple input multiple output (MIMO) scheme are depicted. A first powerline communication modem 500 transmits signals to a second powerline communication modem 502 over a powerline communication network 504. There are three possibilities for feeding signals into the powerline communication network 504. - A differential-mode signal might be fed between the phase line P and the neutral line N, a differential-mode signal might be fed between the phase line P and the protective earth line PE and a differential-mode signal might be fed between the neutral line N and the protective earth line PE. Due to Kirchhoff s laws only two independent paths are possible. It is advisable to use the two best possibilities with respect to e.g. noise properties in order to feed the signals into the power
line communication network 504. - On the receiving side there are four possibilities to receive the signals. It is possible to determine the differential-mode signal between phase line and neutral line, to determine the differential-mode signal between phase line P and protective earth PE and to determine the differential-mode signal between the neutral line N and the protective earth line PE. In addition it is possible to detect the common-mode signal CM by using e.g. the common-
mode choke 120. - With a proposed device for determining a common-mode signal and a power line communication network there is no longer a lost isolation between the three differential-modes (balanced or symmetrically) between the lines.
- Multiple-input multiple-output (MIMO) communication signals are fed or received symmetrically or balanced between the phase line P and the neutral line N, the phase line P and the protective earth line PE and/or the neutral line N and the protective earth line PE. Multiple-input multiple-output technologies show maximum gain compared to signal input signal output schemes if individual signals provide maximum divergence.
- With the proposed device a coupling between individual differential-mode signals is reduced, thus increasing the performance of MIMO technology.
- Although specific embodiments have been illustrated and described herein, it will be appreciated by those of ordinary skill in the art that a variety of alternate and equivalent implementations may be substituted for the specific embodiments shown described without departing from the scope of the described embodiments. This application is intended to cover any adaptations of variations of the specific embodiments discussed herein. Therefore, it is intended that this invention be limited only by the claims and the equivalence thereof.
Claims (15)
1. A Power Line Communication (PLC) device, comprising:
a phase line coupled to a phase line terminal;
a neutral line coupled to a neutral line terminal;
a protective earth line coupled to a protective earth terminal; and
a first high pass filter connected in line with the protective earth line.
2. The device according to claim 1 ,
wherein the first high pass filter includes a capacitor and is coupled to a first inductive element.
3. The device according to claim 2 ,
wherein the protective earth line is coupled to the first inductive element and a second inductive element.
4. The device according to claim 1 , further comprising:
a second high-pass filter connected in line with the phase line, a first end of the second high-pass filter being coupled to the phase line terminal, and a second end of the second high-pass filter being coupled to a first impedance element; and
a third capacitor connected in line with the neutral line, a first end of the third capacitor being coupled to the neutral terminal, and a second end of the third capacitor being coupled to a second impedance element,
wherein the first and second high pass filters include first and second capacitors, respectively.
5. The device according to claim 1 ,
further comprising a first capacitor connected in line with the phase line, a first end of the first capacitor being coupled to a first impedance element.
6. The device according to claim 5 ,
further comprising a second capacitor connected in line with the neutral line, a first end of the second capacitor being coupled to a second impedance element.
7. The device according to claim 6 ,
wherein a second end of the first capacitor is coupled to the phase line terminal,
wherein a second end of the second capacitor is coupled to the neutral line terminal, and
wherein a first end of the first high pass filter is coupled to a first inductive element.
8. The device according to claim 7 ,
wherein the first inductive element is a transformer.
9. The device according to claim 6 ,
wherein the first capacitor and second capacitors are isolation capacitors to isolate the device against direct current signals in the phase and neutral lines, respectively.
10. The device according to claim 6 ,
wherein the first high pass filter is coupled to a third impedance element.
11. The device according to claim 1 ,
wherein the first high pass filter is coupled to an impedance element having a value of 50 Ohms.
12. The device according to claim 11 ,
wherein the impedance element is different from a first inductive element coupled to the first high pass filter.
13. The device according to claim 1 ,
wherein a first end of the first high pass filter is coupled to the protective earth terminal, and
wherein a second end of the first high pass filter is coupled to a first inductive element.
14. The device according to claim 1 ,
wherein said device is a multiple-input and multiple-output (MIMO) Power Line Communication (PLC) modem to receive symmetrical or balanced input communication signals and has a plurality of inputs and a plurality of outputs, and
wherein said modem is one of a plurality of said modems included in a local power line network.
15. The device according to claim 14 ,
wherein a number of inputs to said modem differs from a number of outputs from said modem.
Priority Applications (1)
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US14/178,003 US20140167499A1 (en) | 2008-08-20 | 2014-02-11 | Device for determining a common-mode signal in a power line communication network |
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP08014781.2 | 2008-08-20 | ||
EP08014781A EP2157704B1 (en) | 2008-08-20 | 2008-08-20 | Device for determining a common-mode signal in a power line communication network |
PCT/EP2009/003302 WO2010020298A1 (en) | 2008-08-20 | 2009-05-08 | Device for determining a common-mode signal in a power line communication network |
US201113058281A | 2011-05-05 | 2011-05-05 | |
US13/750,454 US9866275B2 (en) | 2008-08-20 | 2013-01-25 | Multiple-input and multiple-output modem for connection in a power line communication network |
US14/178,003 US20140167499A1 (en) | 2008-08-20 | 2014-02-11 | Device for determining a common-mode signal in a power line communication network |
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US13/750,454 Division US9866275B2 (en) | 2008-08-20 | 2013-01-25 | Multiple-input and multiple-output modem for connection in a power line communication network |
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US20140167499A1 true US20140167499A1 (en) | 2014-06-19 |
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US13/058,281 Active 2031-03-24 US9112590B2 (en) | 2008-08-20 | 2009-05-08 | Device for coupling out a common-mode signal in a power line communication network |
US13/750,454 Active 2031-08-16 US9866275B2 (en) | 2008-08-20 | 2013-01-25 | Multiple-input and multiple-output modem for connection in a power line communication network |
US14/178,003 Abandoned US20140167499A1 (en) | 2008-08-20 | 2014-02-11 | Device for determining a common-mode signal in a power line communication network |
Family Applications Before (2)
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US13/058,281 Active 2031-03-24 US9112590B2 (en) | 2008-08-20 | 2009-05-08 | Device for coupling out a common-mode signal in a power line communication network |
US13/750,454 Active 2031-08-16 US9866275B2 (en) | 2008-08-20 | 2013-01-25 | Multiple-input and multiple-output modem for connection in a power line communication network |
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US (3) | US9112590B2 (en) |
EP (1) | EP2157704B1 (en) |
KR (1) | KR101532466B1 (en) |
CN (1) | CN102132500B (en) |
AT (1) | ATE543266T1 (en) |
AU (1) | AU2009284446B2 (en) |
BR (1) | BRPI0916897B8 (en) |
ES (1) | ES2378585T3 (en) |
RU (1) | RU2488961C2 (en) |
WO (1) | WO2010020298A1 (en) |
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Publication number | Publication date |
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EP2157704B1 (en) | 2012-01-25 |
AU2009284446A1 (en) | 2010-02-25 |
US9112590B2 (en) | 2015-08-18 |
KR20110050642A (en) | 2011-05-16 |
ATE543266T1 (en) | 2012-02-15 |
ES2378585T3 (en) | 2012-04-16 |
CN102132500B (en) | 2015-06-24 |
WO2010020298A1 (en) | 2010-02-25 |
CN102132500A (en) | 2011-07-20 |
US9866275B2 (en) | 2018-01-09 |
RU2011110433A (en) | 2012-09-27 |
EP2157704A1 (en) | 2010-02-24 |
RU2488961C2 (en) | 2013-07-27 |
US20130142233A1 (en) | 2013-06-06 |
BRPI0916897B8 (en) | 2020-11-03 |
AU2009284446B2 (en) | 2015-05-14 |
US20110206140A1 (en) | 2011-08-25 |
BRPI0916897B1 (en) | 2020-09-29 |
BRPI0916897A2 (en) | 2016-02-10 |
KR101532466B1 (en) | 2015-06-29 |
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