EP2392077A2 - Modem zur übertragung von daten über ein stromversorgungsnetzwerk - Google Patents
Modem zur übertragung von daten über ein stromversorgungsnetzwerkInfo
- Publication number
- EP2392077A2 EP2392077A2 EP10711822A EP10711822A EP2392077A2 EP 2392077 A2 EP2392077 A2 EP 2392077A2 EP 10711822 A EP10711822 A EP 10711822A EP 10711822 A EP10711822 A EP 10711822A EP 2392077 A2 EP2392077 A2 EP 2392077A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- power supply
- modem
- phases
- phase
- processing unit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
- H04B3/542—Systems for transmission via power distribution lines the information being in digital form
-
- 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
- H04B2203/5404—Methods of transmitting or receiving signals via power distribution lines
-
- 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
Definitions
- the invention relates to a modem for transmitting data via a power supply network, wherein the power supply network has at least two phases and a neutral conductor and wherein the modem has a power supply for powering the modem and a signal processing unit.
- modems When transmitting data over power networks usually modems are used, which are plugged by an end user into a standard power outlet.
- the signals modulated by the modem to the phase of the socket are transmitted via the power supply network and can be received by a modem at almost any socket within the building. If the sockets of the transmitter and the receiver are at a different phase, coupling capacitors are used, which couple the phases to one another for PLC signals.
- the coupling can be made in the electricity meter or it can be used in the crosstalk within the lines of the power supply network.
- the modems used In Europe's most widespread three-phase network with 230 V line voltages, the modems used must be designed for a voltage of 400 V. This requires a corresponding dimensioning of the components, which on the one hand increases the size of the modem, on the other hand, the cost of the modem increases sharply.
- the present invention is therefore the object of a modem of the type mentioned in such a way and further, that safe operation of the modem can be ensured on a multi-phase power supply network with a cost-effective design of the modem in compliance with legal requirements.
- the above object is solved by the features of claim 1.
- the modem in question is characterized in that the power supply is single-phase and that the signal processing unit is coupled to send and receive data to at least two of the phases.
- the problem of voltage resistance and the dimensioning of the modem can be decoupled.
- the signal processing unit with which the data to be transmitted is modulated onto the power supply network or the signals received from the power supply network are demodulated, is coupled to at least two of the phases of the power supply network.
- the necessary power supply for the modem power supply is operated only single-phase.
- the modem known in the prior art only the components necessary for the coupling of the signal processing unit to the power supply network have a dielectric strength for connection to the outer conductor voltage, while the power supply and the other components of the modem can be designed for the phase voltages and below.
- a single-phase modem can be converted by simple replacement of fewer components for multi-phase operation, without the need for costly redesign and, in particular, greater dimensioning of the modem.
- the thus formed modem can be operated safely on a multi-phase power supply network and complies with the legal provisions.
- the modem according to the invention has a connection which provides a connection to at least two phases and a neutral conductor of the power supply network. This requirement is easy to meet for all multi-phase power supply networks.
- the connection could additionally provide a connection to another phase of the power supply network.
- an optional protective conductor could be available at the terminal connected to a ground.
- the single-phase power supply of the modem could be connected to one of the phases of the power supply network and the neutral that are available through the modem's connector.
- the power supply does not have to be designed for the significantly higher outer conductor voltage.
- Which of the available at the connection phases for operating the power supply is used, is irrelevant to the function of the modem according to the invention. Essential is only the operation at one phase with respect to the neutral conductor.
- a protective device could be provided immediately after connection. In particular, this could ensure overvoltage protection, so that an overvoltage occurring in the power supply network would be exceeded. voltage does not destroy the modem. Circuits that provide surge protection are well known in the art.
- the coupling of the signal processing unit of the modem via a coupling capacitor via a coupling capacitor.
- a coupling capacitor is arranged between the phases of the power supply network to which the signal processing unit is coupled.
- the coupling capacitors are dimensioned such that the AC voltage of the power supply network with mostly 50 Hz or 60 Hz is separated by the coupling capacitors of the signal processing unit.
- the coupling capacitors make a connection that they pass almost unaffected. Since the coupling capacitors are directly connected to the phases of the power supply network, they must have a dielectric strength, which is prescribed for a connection to external line voltages. For example, in Germany, depending on the place of use and the associated test criteria, a dielectric strength of up to 10 kV must be achieved.
- a transformer To achieve a galvanic isolation of the signal processing unit of the power supply network could be arranged between the coupling capacitors and the signal processing unit, a transformer.
- the transformer would have a connection to each of the phases used for communication. If two phases of the power supply network were used for communication, the transformer would be connected to the coupling capacitors, which are used for coupling to these two phases. The voltage thus tapped at two coupling capacitors would be transmitted through the transformer in the direction of signal processing unit.
- a branch of the transformer could be provided between each of the phases.
- the transformer could be connected as a delta connection to the phases, the voltage between two outer conductors resting on each leg of the triangle and each leg forming part of the transformer.
- Each of these parts would have a se- provided kundärs ⁇ ite to which the voltage applied on the primary side is transformed.
- Corresponding embodiments apply to the sending of the data, in which signals are generated by the signal processing unit and are transmitted in the direction of the power supply network.
- a translation of the transformer in the ratio 1: 1 makes sense.
- other gear ratios can be used, for example, if the signal processing unit can not output sufficiently high voltages.
- the signal processing unit comprises a signal conditioning circuit and a coding / decoding circuit.
- the signal conditioning circuit prepares the received and to be sent signals appropriately and is generally constructed as an analog circuit.
- hybrid circuits could also be used which provide, for example, a programmable gain or an adaptation of filter boundaries.
- the coding / decoding circuit performs a digital processing of the data and encodes the data to be transmitted or decodes the received data.
- the encoding / decoding circuit performs or at least prepares for modulation and demodulation.
- Such a circuit could be in the form of an integrated circuit and formed by a powerline chip.
- the signal conditioning circuit could perform filtering of signals received from the power network. This filtering generally involves bandpass filtering of the signals received from the power network. Low-frequency signals that are not used for transmission over the power network could be hidden. Thus, if necessary, the coupling capacitors passing AC voltage of the power supply network could be hidden. Furthermore, high-frequency interference, which originate for example from a broadcast channel, can be hidden. Signals to be transmitted via the power supply network could be suitably amplified by the signal conditioning circuit. In this way, the voltage levels necessary for transmission on the power network would be achievable.
- Coding of the data to be sent via the power supply network could be carried out on the part of the coding / decoding circuit.
- the data received from a terminal are suitably prepared and a modulation of the data prepared or carried out.
- Various coding and modulation methods known from practice can be used for this purpose.
- the coding circuit would generate an analog signal which is coupled into the signal conditioning circuit and sent to the power supply network.
- a digital analog converter could be available to the coding circuit.
- a decoding of the data received from the power network could be performed by the encoding / decoding circuit.
- the properly conditioned analog signals could first be sampled at the input of the encoder / decoder circuit and converted to digital signals. These could then be subjected to decoding and converted into data formats suitable for the terminal.
- a terminal could be connected to the coding / decoding circuit.
- This terminal could on the one hand be arranged in the same housing as the modem itself.
- the modem and the terminal would be implemented as one device.
- the terminal could also be connected to the modem via a suitable interface.
- a suitable network such as Ethernet or WLAN (Wireless Local Area Network), as conceivable as other connections such as USB (Universal Serial Bus) or wireless connections are suitable.
- the coding / decoding circuit would be followed by a suitable interface circuit which converts the data into a form that can be understood by the terminal.
- this is designed to modulate data on two phases.
- a modulation of the data phase against phase, ie the modulated signal would be switched between two phases.
- the signal processing unit is designed to modulate data on three phases. Two of the three phases could be used in the sense of a two-phase modulation, i. on two phases, a phase-to-phase modulation would occur.
- the third phase could be formed by a modulation to a phase with respect to the neutral conductor. This would create two independent communication channels.
- a single-phase modulation could be performed on all three phases, whereby three channels are available.
- the modulation on three phases could be designed such that the three phases are used in the sense of a three-phase network.
- the modulated voltages between two outer conductors would in this case be designed such that a three-phase current vector can be defined from the modulated voltages, which represents the modulated data.
- a modulation to three phases could also take place in that not several communication channels are spanned, but the same signal is modulated on all three phases. This could be done on the one hand, a phase-to-phase modulation in two of the phases along with a phase-to-neutral modulation phase in the third phase, and a phase-to-neutral phase modulation phase in all three phases.
- the above statements regarding a modulation of data to two or three phases apply accordingly to a demodulation of signals from the power supply network.
- the signals coupled in from the power supply network into the signal processing unit are suitably sampled, filtered and decoded.
- the demodulation takes place - according to the modulation - of two or three phases.
- the power supply network could be formed by a three-phase three-phase network. Such three-phase three-phase networks are widely used worldwide.
- the power supply could be used to power a terminal connected to the modem. This would be particularly suitable if the terminal is integrated in the same housing as the modem itself.
- the communication interface itself could also be used for the power supply, as is common, for example, with USB-connected terminals or with "Power over Ethernet".
- terminals various devices known from practice could be used.
- a commercially available computer would be conceivable as the terminal, which receives access to the Internet via the modem according to the invention.
- Telephones, audio components or video systems could also act as terminals that can communicate with other devices inside or outside a building.
- the end device could also be an electricity meter which detects the energy converted within a building or parts of a building and makes this data available to an energy supplier via the power supply network.
- the terminal namely the electricity meter, and the modem would be integrated in the same housing. The power supply of the modem would then be used to power the electronics of the electricity meter.
- FIG. 1 shows a modem according to the invention with a single-phase power supply and a multi-phase coupled signal processing unit.
- the sole FIGURE shows an embodiment of a modem according to the invention.
- the modem 1 has a power supply unit 2, with which a signal processing unit 3 and optionally, a connected to the modem, not shown terminal, is powered.
- the signal processing unit 3 serves to demodulate the signals received from the power supply network and provide them to a terminal and in the reverse direction to prepare the data to be sent via the power supply network for transmission over the power supply network.
- the modem 1 is connected via a connecting line 4 to a power supply network.
- the power supply network has at least two phases L1 and L2 and optionally a third phase L3 (shown in dashed lines). Between the phases L1 and L2, an outer conductor voltage U 12 is applied .
- a neutral conductor N is present, which can simultaneously - in a PEN network - take over the function of a protective conductor. In a combined function as a neutral conductor and protective conductor, the name PEN is common. However, it should be understood that the term N shown in the figure may also mean a PEN conductor. If the protective conductor and the neutral conductor are designed separately, then - as shown in the figure - a further conductor in the connection line 4 may be provided.
- the protective conductor PE is connected to the housing of the modem, if this is made of metal. In a plastic housing, the protective conductor PE remains generally unused.
- an overvoltage protection 5 is provided, which protects the components of the modem against overvoltages from the power supply network.
- the overvoltage protection 5, the power supply 2 and the signal processing unit 3 is arranged downstream.
- the power supply 2 is connected to the phase L1 and the neutral conductor N of the power supply network.
- the line voltage U 1 of usually 230 V is applied to the power supply unit.
- the power supply transforms the voltage U 1 into at least one lower voltage, which usually comprises a DC voltage.
- several voltages can be generated by the power supply 2.
- the power supply unit 2 via a supply line 6 (shown in phantom) can be used with a terminal not shown.
- the two phases L1 and L2 of the power supply network are connected via coupling capacitors C 1 and C 2 to a transformer 7.
- the coupling capacitors are used to keep low-frequency voltages - in particular the AC voltage of the power supply network - from the transmitter while high-frequency signals reach the transmitter.
- At the transformer is the high-pass filtered by the coupling capacitors C 1 and C 2 , tapped at two phases voltage Ui 2 'at.
- the transformer 7 ensures galvanic isolation between the power supply network and the signal processing unit 3.
- the transmitter 7 carries out a transmission in the ratio 1: 1.
- the signal processing unit 3 comprises a signal conditioning circuit 8 and an encoding / decoding circuit 9.
- the signals received by the transmitter 7 are conditioned for later decoding. This processing consists essentially of a bandpass filtering of the received signal.
- the data received from the coding / encoding circuit 9 are converted by the signal conditioning circuit 8 into signals which are suitable for transmission via the power supply network. This consists essentially in an amplification of the signals.
- the encoding / decoding circuit 9 At the input or output of the encoding / decoding circuit 9 to the signal conditioning circuit 8 is a unit 10, which performs an analog / digital or digital analog conversion.
- the analog signals received by the signal conditioning circuit 8 are converted into digital signals for the coding / decoding circuit 9 or the digital data to be transmitted coded by the coding coding circuit 9 is converted into analog signals for the signal conditioning circuit 8.
- the encoding / decoding circuit 9 provides an interface between the powerline network and the terminal connected via a data line 11.
- the digital data received by the terminal are processed into suitably modulated signals for transmission via the power supply network or the signals received by the power supply network are processed into digital data for the terminal.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Small-Scale Networks (AREA)
- Dc Digital Transmission (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200910007003 DE102009007003A1 (de) | 2009-01-30 | 2009-01-30 | Modem zur Übertragung von Daten über ein Stromversorgungsnetzwerk |
PCT/DE2010/000077 WO2010085938A2 (de) | 2009-01-30 | 2010-01-27 | Modem zur übertragung von daten über ein stromversorgungsnetzwerk |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2392077A2 true EP2392077A2 (de) | 2011-12-07 |
Family
ID=42243815
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10711822A Ceased EP2392077A2 (de) | 2009-01-30 | 2010-01-27 | Modem zur übertragung von daten über ein stromversorgungsnetzwerk |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2392077A2 (de) |
DE (1) | DE102009007003A1 (de) |
WO (1) | WO2010085938A2 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE202016002968U1 (de) | 2016-05-06 | 2017-08-08 | Telefónica Germany GmbH & Co. OHG | Modem |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5870016A (en) * | 1997-02-03 | 1999-02-09 | Eva Cogenics Inc Euaday Division | Power line carrier data transmission systems having signal conditioning for the carrier data signal |
DE10027155A1 (de) * | 2000-05-31 | 2001-12-06 | Efen Elektrotech Fab | Elektrische Ankoppeleinheit für hochfrequente Datenströme |
FR2870653A1 (fr) * | 2004-05-21 | 2005-11-25 | Oxance Sarl | Procede d'injection d'un signal cpl dans un reseau cable triphase de transport d'energie electrique, et dispositif de couplage pour sa mise en oeuvre |
TWI289386B (en) * | 2005-12-30 | 2007-11-01 | Ind Tech Res Inst | AC/DC power line communication modem |
US7795994B2 (en) * | 2007-06-26 | 2010-09-14 | Current Technologies, Llc | Power line coupling device and method |
-
2009
- 2009-01-30 DE DE200910007003 patent/DE102009007003A1/de not_active Withdrawn
-
2010
- 2010-01-27 EP EP10711822A patent/EP2392077A2/de not_active Ceased
- 2010-01-27 WO PCT/DE2010/000077 patent/WO2010085938A2/de active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2010085938A2 * |
Also Published As
Publication number | Publication date |
---|---|
WO2010085938A2 (de) | 2010-08-05 |
DE102009007003A1 (de) | 2010-08-05 |
WO2010085938A3 (de) | 2010-11-04 |
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