Method and device for transmitting data on at least one electrical power supply line

Translation of description of equivalent WO 0251089 A2

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occur specifically in DC power supplies ia due to the DC voltage generation using rectifiers particularly periodic noise on_r .dj-^e hereinafter abbreviated as "interferer or commonly referred to as glitches. ^';

The periodic glitches caused by the commutation of the current in the rectifier. The power converter components or valves, usually diodes or thyristors in a rectifier lead the DC alternately. When changing the direct current from one valve to another valve caused by inductances between the valves, a voltage spike that / s is connected to power surges in the order of about 400 kV. Since the commutation times are determined by the frequency of Wechselstromnet- indices, enter the glitches in a given time frame, so periodically on.

The object of the invention is therefore to provide a suitable data transmission method in DC voltage power supplies is particularly applicable, and to provide an associated device.

The object is achieved by the measures according to claim. 1 Further developments are indicated in the dependent method claims. An apparatus for carrying out the method according to the invention is the subject matter of claim 9. Further developments of the device are specified in the dependent claims kind.

In the invention, the above-mentioned problem is solved in a simple manner by the OFDM method is designed so that the to be transmitted OFDM blocks have a length of about 85% of the distance between two periodic disturbing pulses. In order to guarantee the orthogonality of the carrier, the frequency difference of two carriers must be in an integer ratio to the reciprocal length of the OFDM block. cυ ur KJ h-¹ P¹ cπ o cπ o o cπ Cπ

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demonstrates faults. This generally applies to DC systems and often also for ac systems.

Further details and benefits- the invention will become apparent from the following description with reference to the drawing in conjunction with the claims. Show it

Figure 1 is a graph showing the time course of a DC voltage for a subway system, Figure 2 shows the transmitter part and

Figure 3 shows the receiver portion of a suitable device for data transmission at DC voltage curves according to FIG. 1

On Stiomversorgungsleitungen of subways data to be transmitted in addition to the power supply. The as Power Line Communication (PLC) technique referred this modulates the information to be transmitted to suitable carriers and superimposes the modulation products in the supply voltage of the subway system.

Subways, for example, operated at a nominal DC voltage of 750 V. Standard practice is to provide the DC voltage by 12-pulse rectifier, which are in turn fed by a converter transformer is. Here there are the 12-pulse rectifier consists of two 6-pulse rectifiers, which are in turn fed by two mutually 30 ° phase windings of the converter transformer. The converter transformer primary is connected to the general power supply with a frequency of 50 Hz. The method described can be used without limitation at other frequencies such as 60 Hz.

Generally includes a metro system. multiple rectifiers, which are installed at intervals of about 2 km along the route network. All rectifiers power the metro System together and are electrically connected together via the conductor rail of the subway system.

To further illustrate the problem, Figure 1 shows an example of a measured temporal profile of the rail DC voltage over a period of 20 ms. The voltage signal is indicated by the first It is apparent that the DC voltage is subject to not constant, but rather, variations of up to about 80 volts.

Specifically arise during the commutation of the currents in the rectifiers at intervals of 20 ms / 12 = 1.67 ms (at 50 Hz - supply) steep-edged voltage jumps with amplitudes of typically 50 V. The resulting, broad- band interference extend to frequencies of 100 kHz, which is within the frequency range of Powerline Communi- cation systems.

From Figure 1 shows that the caused by the steep-edged voltage jumps of tension upsets by filters can be suppressed only partially, since becoming a part of the spectral interference energy may bandpass happen. Thus, the voltage jumps themselves by elaborate filter circuits reduced to the web tension only to 10% and thus typically be 5 V. After a filter are thus still network-synchronous, periodic pulse interferers considerable amplitude available.

The arriving at the receiver useful signal of a PLC-syste s is dependent on the transmission characteristics of the line and the distance of the transmitter and is due to limited allowable transmission power only some 10 mV to more than about 1 V. Thus, the pulse-shaped noise signal is always higher than the useful signal, whereby gives a very bad signal to noise ratio (SNR = signal-to-Noise ratio). co ω w N&gt; P&gt; P¹

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Following is a Ankoppeleinhei.t^" 24 'for coupling to a rail system 25 a subway.^' Also another power supply network for traffic devices can be used.

In the transmitter 20, the data signal is partitioned so that a single data block with a certain safety distance fits between two interfering pulses. Thus, the data signal is always sent in a trouble-free period, the precise temporal correlation is produced pulse grid to Störim- with the above-described combination of SchwelJJwertschalter 33a and subsequent phase-locked loop 33b.

3 shows a receiver 30 of a coupling unit 31 is formed for the rail system of Figure 2, a filter 32, an impedance 34 and a short-circuiting device 35 follows.

The short-circuiting device 35 there is a unit for automatic gain control (AGC = Automatic Gain Control) in accordance with the prior art. Via an A / D-converter 37 the data are fed to a processing unit 38 for OFDM signals.

Again, the noise pulses are detected by means of a threshold on the line side and the strength rechteckför guide signal a phase locked loop (PLL) for the purpose of jitter suppression supplied.

The stable synchronization signal from the phase locked loop in the time frame of the glitches will be the one the^'Short closers 35 and, secondly, the processing unit supplied 38 for OFDM signals. The short-circuiting device thus suppresses the received signal exactly as long as a glitch takes and frees the receiver input as soon as the trouble-free time interval between the noise pulses starts. Due to the stable synchronization signal, the processing unit 38 is for OFDM signals the exact^' known timing of the data to be processed packets, so that a proper data recovery can take place.

Instead of the short-circuiting device 35 in the output line of the filter 32 with upstream impedance 34, a switch is not used in the parallel branch. The impedance 34 is not needed in this case.

After the decoupling through the impedance 34 of the interference pulse is for example characterized kept away from the OFDM processing unit, that the signal line through an analog switch, for example, in

Form of a transistor is short-circuited. As mentioned, it is also possible to attach an electronic switch in series and to separate the downstream signal processing by the filter output during the pulse noise.

The signal is the amplifier 36 with automatic gain control (AGC) supplied that it amplified to a optimally set for the A / D conversion level. In the subsequent processing units then the partitioned signals are combined and decoded prior art accordingly.

It is essential in the method and the associated apparatus as described above, that the per se known OFDM method by a division, ie, a so-called. Partitioning of the data, is modified in such a way that a transfer is performed only in virtually interference-free time portions .. For this is the synchronization of the transmission process with the periodic pulse interferers and there is respectively sent precisely between the glitches. According to the receiver, the detection and hide the glitches. According to the OFDM-signal processing, a composition of the partitioned data is possible.

The invention has been described^' specifically described for the data transmission at a Gleichspannüngsversorgung for subways. Even with other DC-operated networks, for example, in DC systems for self-supply of switchgear, the invention is applicable.