Power and data transmission device.

Abstract

A power and data transmission device comprising a first circuit (100), a second circuit (200), and a cable (300) connecting the first and second circuits and having a first pair (301) and a second pair (302) of electrical conductors for transmitting a data signal and a power signal, the data signal being transmitted in differential mode in one direction on the first pair of electrical conductors and in a second direction on the second pair of electrical conductors; characterized in that the first circuit is arranged to transmit the power signal in differential mode on a sinusoidal carrier using the common modes of the two pairs of conductors, and the second circuit is arranged to receive said power signal while maintaining, with respect to the cable, a real impedance equal to an iterative impedance of the cable. (Figure from the abstract: Fig. 1)

Description

Title of the invention: Power and data transmission device.

[0001] The present invention relates to the field of data transmission between two remote electronic devices, and in particular two electronic devices on board a vehicle, such as an electronic control unit and a sensor.

[0002] BACKGROUND OF THE INVENTION

[0003] In the aeronautical field, the need to ensure the maintenance of aircraft safety and performance has led to an increase in the number of sensors present on aircraft and their distribution throughout the structure and equipment of said aircraft.

[0004] The physical quantities measured by these sensors are of all types and it is necessary to limit as much as possible the intrusive nature of their implantation in the aircraft or its equipment in order to facilitate said implantation and minimize as much as possible the increase in mass linked to the addition of the sensors.

[0005] Two particularly demanding aspects of this implementation concern, firstly, the transmission of data between the sensors and the electronic data processing unit, which is generally connected to the aircraft's electronic control system, and secondly, the power supply to the sensors. The means used for both data transmission and sensor power supply must be relatively lightweight, minimally intrusive, reliable, and require minimal maintenance. Naturally, data transmission via radio waves and battery power supply are considered, but they do not meet all the aforementioned requirements.

[0006] In fact, the ARINC 664 (or AFDX) standard was chosen for data transmissions on aircraft. The implementation of this standard relies on a wired link comprising a shielded differential double-pair cable capable of carrying two opposing data streams (commonly referred to as Tx and Rx) at a bit rate of 125 Mbit / s.

[0007] It is also known, in particular from document FR-A-3049790, that a data link system allows power supply by carrier current so that a power signal travels on the same cable as the data signal.

[0008] One of the difficulties encountered is to prevent the power supply signal from interfering with the data signal.

[0009] SUBJECT OF THE INVENTION

[0010] The invention is notably aimed at a linking system between two electrical devices Ironically, this allows for the combined transmission of a data signal and a power signal while limiting the risk of interference between the data signal and the power signal. Summary of the invention

[0011] To this end, a power and data transmission device is provided, comprising a first circuit, a second circuit, and a cable connecting the first and second circuits, and having a first pair and a second pair of electrical conductors for transmitting a data signal and a power signal. The data signal is transmitted in differential mode, in one direction on the first pair of electrical conductors and in a second direction on the second pair of electrical conductors. According to the invention, the first circuit is arranged to transmit the power signal in differential mode on a sinusoidal carrier using the common modes of the two pairs of conductors, and the second circuit is arranged to receive said power signal while maintaining, with respect to the cable, a real impedance equal to an iterative impedance of the cable.

[0012] The use of a sinusoidal carrier wave ensures optimal coexistence of data and power signals on the same cable. Such a cable, like a conventional coaxial link, is characterized by an iterative impedance, meaning that its actual impedance is repeated along its entire length. When a line with an iterative impedance is loaded by a resistance equal to its iterative impedance (often referred to as its characteristic impedance), its input impedance will have an actual impedance equal to the resistance loading it at its end, regardless of the line's length. When a line with an iterative impedance is loaded by its characteristic impedance, the signals propagate along the line without causing echoes (local overvoltages and / or overcurrents) that could lead to parasitic coupling.Thus, matching the line to its iterative or characteristic impedance prevents standing waves on the alternating wave of the power signal. Such standing waves would cause antinodes or nodes in currents or voltages and would likely increase parasitic coupling between common-mode power transmission and differential-mode data transmission. Therefore, there is effective segregation between the power and data signals. To this end, the second circuit is configured to load the cable with a constant pure resistance even when the load is variable. Transmitting power with sinusoidal voltage and current limits their bandwidth and thus reduces high-frequency coupling. Even more preferably, the power signal carrier is centered on a much lower frequency than the binary data streams.Segregation through filtering is then facilitated.

[0013] Preferably, the first circuit comprises a first transformer connected to the first pair of electrical conductors, a second transformer connected to the second pair of electrical conductors, and a third transformer in common mode on both pairs of electrical conductors; and / or the second circuit comprises a first transformer connected to the first pair of electrical conductors, a second transformer connected to the second pair of electrical conductors, and a third transformer in common mode on both pairs of electrical conductors.

[0014] This provides galvanic isolation which, in combination with AC power transmission, makes it possible to protect all or part of the circuit from lightning and bulk current injection (BCI). The device thus benefits from lightning and BCI resistance without requiring specific protection components that are expensive, bulky, and difficult to test; while minimizing interface wiring and ensuring a maximum bit error rate.

[0015] Advantageously, the first circuit is arranged so that the power signal has an alternating voltage having a high frequency, preferably on the order of megahertz.

[0016] According to additional features, used separately or in whole or in part in combination: - the second circuit includes an AC / DC converter which receives the power signal as input and provides as output a DC power signal having a rectified voltage and an electronic load arranged to be proportional to the rectified voltage. - the AC / DC converter is associated with a filter arranged to attenuate switching noise from the AC / DC converter; - the filter includes a common-mode mutual inductance; - the electronic load includes a current generator that follows the rectified voltage and is connected to the output of the AC / DC converter; - a low-pass filter Pi is placed at the output of the current generator and matched to the iterative impedance of the cable; - the second circuit includes a Zener diode voltage regulator; - the second circuit includes a low dropout linear voltage regulator.

[0017] The electronic charging circuit is an advantageous means of presenting a constant and real charge to the energy transport line in order not to create standing waves or current distortions (because this corresponds to a broadening of the frequency spectrum of the current and therefore creates crosstalk with data transmission).

[0018] The invention also relates to an aircraft equipped with such a remote link device for connecting an electronic data processing unit to a sensor.

[0019] Other features and advantages of the invention will become apparent from the following description of particular, non-limiting embodiments of the invention. Brief description of the drawings

[0020] Reference will be made to the attached drawings, among which:

[0021] [Fig-1] [Fig.1] is an overview of the transmission device circuit according to the invention;

[0022] [Fig.2] [Fig.2] is an overview of the first circuit of the device transmission;

[0023] [Fig.3] [Fig.3] is an overview of the circuit of the second circuit of the device of this transmission device, according to a first embodiment of the invention;

[0024] [Fig.4] [Fig.4] is a partial view of the second circuit according to a variant of the first embodiment of the invention;

[0025] [Fig. 5] [Fig. 5] is an overview of the second circuit of this device transmission, according to a second embodiment of the invention. DETAILED DESCRIPTION OF THE INVENTION

[0026] With reference to [Fig. 1], the transmission device according to the invention comprises a first circuit 100, a second circuit 200 and a cable 300 providing a link between the first circuit 100 and the second circuit 200. According to a typical application of the invention, the first circuit 100 is arranged to be connected to a first electronic device, for example a data processing computer, and the second circuit 200 is arranged to be connected to a second electronic device, for example a detector providing measurement data of any physical parameter.

[0027] The cable 300, here referred to as "QUADRAX", is standard and comprises a first pair 301 of electrical conductors and a second pair 302 of electrical conductors. In a manner known per se, the pairs are twisted and arranged in quadrature within a shield 303.

[0028] The first circuit includes an input 101 for the data to be transmitted, an output 102 for the data received, and a power supply 103 receiving a continuous power input signal provided for example by the first device or a power distribution network.

[0029] The input 101 is connected to the terminals of a primary winding 104.1 of a first transformer 104 having a secondary winding 104.2 to the terminals of which are connected the electrical conductors of the first pair 301 of the cable 300.

[0030] The output 102 is connected to the terminals of a secondary winding 105.2 of a second transformer 105 having a primary winding 105.1 across the terminals of which are connected the electrical conductors of the second pair 302 of the cable 300.

[0031] The power supply 103 is connected to the terminals of a primary winding 106.1 of a third transformer 106 having a secondary winding 106.2 with a first terminal connected to the midpoint of the secondary winding 104.2, a second terminal connected to the midpoint of the primary winding 105.1, and a midpoint connected to the mechanical ground of the first circuit 100 and / or the first device and to the shield 303 of the cable 300 (this mechanical ground constitutes the potential reference for the first device and the first circuit 100). The power supply 103 includes a DC / AC converter arranged to convert the input DC power signal into a sinusoidal AC power signal having a frequency on the order of megahertz and more particularly equal here to 1 MHz.

[0032] The second circuit includes an output 201 of the data received from the first device, an input 202 of the data to be transmitted to the first device, and a power supply 203 providing a continuous output power signal to the second device.

[0033] The output 201 is connected to the terminals of a secondary winding 204.2 of a first transformer 204 having a primary winding 204.1 to the terminals of which are connected the electrical conductors of the first pair 301 of the cable 300. A Tx line is thus formed between the input 101 and the output 201.

[0034] The input 202 is connected to the terminals of a primary winding 205.1 of a second transformer 205 having a secondary winding 205.2 to the terminals of which are connected the electrical conductors of the second pair 302 of the cable 300. A line Rx is thus formed between the input 202 and the output 102.

[0035] The power supply 203 is connected to the terminals of a secondary winding 206.2 of a third transformer 206 having a primary winding 206.1 having a first terminal connected to the midpoint of the primary winding 204.1, a second terminal connected to the midpoint of the secondary winding 205.2, and a midpoint connected to the mechanical ground of the second circuit 200 and / or the second device and to the shield 303 of the cable 300 (this mechanical ground constitutes the potential reference for the second device and the second circuit 200) via a capacitor 213.1 and a resistor 213.2. The power supply 203 includes an AC / DC converter arranged to convert the received alternating power signal into a direct current output power signal suitable for powering the second device.

[0036] It is understood that this provides a complete galvanic isolation solution, for both direct current and high-frequency alternating current, which protects the second device from overvoltage and / or massive current injection (lightning and BCI). Therefore, it is not necessary to use protective components, such as surge suppressors, which are difficult to monitor both during manufacturing and operation.

[0037] The data transmission part is carried out in a conventional manner and will not be described further here. Therefore, the following description focuses solely on the power part.

[0038] The power supply 103 preferably comprises a sinusoidal voltage generator having a frequency of about 1 MHz and an angular phase shift (cosine PHI) equal to 1. This sinusoidal voltage generator is arranged to transmit each of its phases in common mode on the pair of electrical conductors 301 of the Tx line and on the pair of electrical conductors 302 of the Rx line respectively.

[0039] An example of a sinusoidal voltage generator 1030 is shown in [Fig. 2]. With reference to [Fig. 2], the sinusoidal voltage generator 1030 comprises a crystal oscillator 1031 having a first terminal connected to a first input of a first exclusive OR gate 1032.1 and a second terminal connected to an output of the first exclusive OR gate 1032.1. The output of the first exclusive OR gate 1032.1 is connected to a first input of a second exclusive OR gate 1032.2, which has an output connected to a first input of an output of the third exclusive OR gate 1032.3 and to the first input of a fourth exclusive OR gate 1032.4. The XOR gates 1032.1, 103.2, and 103.3 have second inputs connected to ground, and the fourth XOR gate 1032.4 has a second input receiving the DC power input signal. The fourth XOR gate 1032.4 has an output connected to four amplifiers 1033, each with an output connected via a resistor 1034 to the positive terminal of the primary winding 103.1, and the third exclusive OR gate 1032.3 has an output connected to four amplifiers 1035, each with an output connected via a resistor 1036 to the negative terminal of the primary winding 106.1. The exclusive OR gates 1032 are thus integrated into a circuit known as a quartz oscillator and phase shifter. Amplifiers 1033 and 1035 belong, for example, to a digital buffer whose currents are distributed by resistors 1034 and 1036, which provide short-circuit protection for the connection between the first circuit 100 and the second circuit 200.

[0040] The connection of the primary winding 105.1 and the secondary winding 104.2 to the secondary winding 106.2 will be detailed. The center tap of the primary transformer 105.1 is connected to a first terminal of a first capacitor 107.1, which has a second terminal connected to the center tap of the secondary transformer 104.2. The secondary winding 106.2 has a first terminal connected to the first terminal of the capacitor 107.1 by a first line 108.1 and a second terminal connected to the second terminal of the capacitor by a second line 108.2. The first line 108.1 comprises two coils 109.1 in series that are biased in the same way, and the second line 108.2 comprises two coils 109.2 in series that are biased in the opposite direction. In the opposite direction to coils 109.1, each coil 109.1, 109.2 therefore has its own inductance, and each pair of coils 109.1, 109.2 opposite each other exhibits a mutual inductance. A second capacitor 107.2 extends between the connection point of coils 109.1 to each other and the connection point of coils 109.2 to each other. The midpoint of the secondary winding 106.2 is connected to mechanical ground M-Gnd via a third capacitor 107.3 and a resistor 107.4 to achieve common-mode line matching. This forms a low-loss LC low-pass filter, of the fourth order and due to the absence of a resistive component, ensuring the elimination of the high-frequency components of the sinusoidal signal which is transmitted with each potential on the common mode of one of the pairs 301, 302 and with the DC component in common mode.

[0041] The second circuit 200, according to a first embodiment, will be described in relation to [Fig.3].

[0042] The first stage comprises a filter 207 and a rectifier bridge 208. The filter 207 is a Pi LC filter comprising a pair of inductors 2071, 2072, with opposite polarities and facing each other, each having its own inductance and together a mutual inductance, each having a first terminal connected to one of the terminals of the secondary winding 206.2 and a second terminal connected to one of the input terminals of the rectifier bridge 208. A first capacitor 2073 connects the first terminals of the inductors 2071, 2072 together, and a second capacitor 2074 connects the second terminals of the inductors 2071, 2072 together. The rectifier bridge 208 is here a full-wave rectifier bridge of the conventional type, in this case of the Graetz type. Filter 207 is an analog circuit that provides pre-filtering to attenuate switching noise from rectifier bridge 208.It is understood that the first stage ensures the conversion of the alternating power signal into a direct power signal having a full-wave rectified voltage equal to the average of the sinusoidal voltage.

[0043] The second stage is arranged to form a current follower 209 of the rectified voltage and comprises a first line 209.1 and a second line 209.2, each extending from one of the output terminals of the rectifier bridge 208 to one of the input terminals of the third stage. The second line comprises, in series, a resistor 2091 and an NPN transistor 2092, having an emitter connected to the resistor 2091 and a collector connected, as previously described, to one of the input terminals of the third stage. The second stage also includes an operational amplifier 2090 having a positive input connected to a voltage divider 2093 linking lines 209.1 and 209.2, a negative input connected to the second line 209.2 between resistor 2091 and transistor 2092, a positive supply pin connected to the cathode of a diode 2094 having an anode connected to the first line 209.1, a A negative power supply pin is connected to the second line 209.2, and an output is connected via a resistor 2095 to a base of transistor 2092. A capacitor 2096 also connects the cathode of diode 2094 to the second line 209.2. The second stage constitutes an electronic load that simulates resistive load behavior by forming a current-controlled consumer that follows the waveform of the full-wave rectified voltage. The second stage thus allows cable 300 to "see" a constant load.

[0044] The third stage comprises a Pi LC filter 210 analogous to filter 207. Filter 210 comprises a pair of inductors 2101, 2102, with opposite polarities and facing each other, each having its own inductance and together a mutual inductance. The first inductor 2101 has a first terminal connected to the first line 209.1 of the second stage and a second terminal connected to a first line 211.1 of the fourth stage. The second inductor 2102 has a first terminal connected to the second line 209.2 of the second stage and a second terminal connected to a second line 211.2 of the fourth stage. A first capacitor 2103 connects the first terminals of coils 2101, 2102 together and a second capacitor 2104 connects the second terminals of coils 2101, 2102 together. It is understood that the filter 210 allows the resulting average voltage to be extracted.

[0045] The fourth stage forms a load proportional to the rectified voltage received at the input and therefore a current consumer controlled by the received DC voltage to provide a constant voltage to the second device (i.e., the load user). The fourth stage includes a current generator 211 analogous to the current consumer 209. The first line 211.1 and the second line 211.2 are connected, opposite the third stage, to a voltage regulator 212 which includes in parallel a Zener diode 2121 and a capacitor 2122 and which is connected to the second device. The second line 211.2 includes in series a resistor 2111 and an NPN transistor 2112, having an emitter connected to the resistor 2111 and a collector connected as previously described to the voltage regulator 212. The fourth stage also includes an operational amplifier 2110 having a positive input connected to a voltage divider 2113 connecting lines 211.1 and 211.2, a negative input connected to the second line 211.2 between resistor 2111 and transistor 2112, a positive supply pin connected to the cathode of a diode 2114 having an anode connected to the first line 211.1, a negative supply pin connected to the second line 211.2, and an output connected via a resistor 2115 to a base of transistor 2112. A capacitor 2116 further connects the cathode of diode 2114 to the second line 211.2. The voltage regulator 212 makes the device less sensitive to load variations. The current drawn therefore varies only slightly, depending on the variation in the received input voltage. This current flows through... the equivalent of a Zener diode, across whose terminals a constant voltage is found regardless of the current flowing through it.

[0046] The second circuit therefore draws a voltage similar to the reference voltage to maintain a constant load "seen" by the cable. For example, the cable is loaded by the second circuit to a true resistance of 100 ohms (i=u / r). It is understood that the rectified voltage, equal to the average of the sinusoidal voltage received at the input, serves as the reference voltage for the current generators.

[0047] Preferably, the transformers and coupled inductors are manufactured using PCB technology, i.e., by embedding the cores in the PCB boards and constructing the coils using conductive traces, because this technology guarantees reproducible electrical performance and symmetries such that common-mode rejection is greatly improved. This technology is, for example, described in documents FR-A-2201553 and FR-A-3110780.

[0048] In the variant of [Fig.4], the voltage regulator 212 is replaced by a low dropout linear voltage regulator or LDO also connected to ground.

[0049] The LDO voltage regulator is an analog "series" voltage regulator capable of operating with a very low voltage drop between its input and output. Furthermore, it provides a more precise output voltage, and it is often easier to adjust the output voltage simply by changing the values ​​of resistors not shown in the figure.

[0050] It is then possible to use in the first stage a third-order (and no longer fourth-order) LC low-pass filter 207 because its role is just to limit the reinjection of the switching noise of the diodes of the rectifier bridge 208 into the cable 300.

[0051] The second circuit 200, according to a second embodiment, will be described in relation to [Fig. 5]. The second circuit 200 also comprises four stages. The first and second stages are identical to those of the variant above.

[0052] The second circuit 200 according to the second embodiment differs from the variant of the first embodiment firstly in that the windings 204.2, 206.2 and 205.1 have midpoints connected via capacitors 2041, 2061 and 2051 to the mechanical ground Sensor housing-Gnd of the second circuit 200 and of the second device.

[0053] The second circuit 200 according to the second embodiment differs from the variant of the first embodiment secondly in that the current generator 211 is omitted and replaced by a voltage recovery circuit 220. The voltage recovery circuit 220 includes a diode 2201 having an anode connected to the first line 209.1 and to the collector of the NPN transistor 2092 and a cathode connected to the voltage regulator LDO. The voltage recovery circuit 220 also includes a capacitor 2202 having a first terminal connected to the cathode of diode 2021 and to a first branch of the LDO voltage regulator and a second terminal connected to a second branch of the LDO voltage regulator and to mechanical ground.

[0054] The diode 2021, capacitor 2022, and LDO voltage regulator assembly forms a variable load stage to provide a constant voltage to the second device. The current consumption is variable such that the sum of the current at the emitter of transistor 2092 and the second branch of the LDO is the same as at the positive input of amplifier 2090. Transistor 2092 acts as an adjustment variable for the current consumption of the second circuit 200, provided that no voltage is present at the negative input of amplifier 2090. It should be noted that the current consumption through diode 2093 is very low, which has very little influence on the overall current consumption of the second circuit 200.

[0055] Electromagnetic compatibility with respect to massive current injections resulting from high-frequency radar-type pulses that produce common-mode disturbances is achieved by the symmetry of the lines, the connection to the mechanical ground, and the differential connection of the dual inductor. The capacitor 2061 further dissipates common-mode disturbances.

[0056] The four-pole common-mode inductance of coils 2071 and 2072 is applied to the entire four-wire line to present a high impedance to high-frequency common-mode parasitic signals. Transformers 204, 205, and 206 provide DC and low-frequency isolation. At series resonance of this assembly (around 100 MHz), the system being highly symmetrical due to PCB technology, the currents are balanced, opposite, and flow almost entirely to the shield 303 of cable 300 via resistor 213.2. The value of the resistance 213.2 is equal to the characteristic impedance value of the cable 300 in common mode, between 50 and 100 ohms, in order to avoid creating standing waves which could increase common mode currents or voltages in certain parts of the cable, and thus create disturbances on useful signals by poor common mode rejection.

[0057] The residual common-mode voltages are all transmitted to the equipotential of the mechanical ground, which is itself connected to the structure close to the carrier. Thus, lightning and BCI currents cannot create differential voltages that are dangerous for the electronics of this sensor. For this reason, the capacitors 2041, 2051 and 2061 have a low impedance with respect to the high-frequency common-mode voltages exacerbated during the resonance of the series LC pairs formed by: - ​​the common-mode inductance of the coils 2071 and 2072 and the transformer 204; - the common mode inductance of coils 2071 and 2072 and transformer 205; - the common mode inductance of coils 2071 and 2072 and transformer 206.

[0058] Thus, the high-frequency currents are mainly fed back to the proximity potential reference of the second device. This results in a high-frequency common-mode voltage, applied to the electronics of the second device, which is completely minimized and therefore has no effect on the operation of the second device.

[0059] The invention is particularly usable in an aircraft A comprising a data processing device A1 connected to the first circuit 100 of the device according to the invention and at least one sensor A2 connected to the second circuit 200 of this device.

[0060] Of course, the invention is not limited to the embodiments described but encompasses any variant falling within the scope of the invention as defined by the claims.

[0061] In particular, any sinusoidal signal generator can be used as a current generator. The sinusoidal signal generator can further be arranged to provide a signal having a frequency other than 1 MHz.

[0062] The described structure is particularly simple. Indeed, the received sinusoidal signal must be loaded by a "real" resistance equal to the characteristic impedance of the line (around one hundred ohms in the case of the Quadrax cable), and the power to be transmitted is low, on the order of a watt: to keep the system as simple as possible, a purely analog solution is preferred here, despite its low efficiency. However, a solution based on digital components could be considered.

[0063] This solution is also advantageous because many of the components that can be used to implement it are readily available commercially.

[0064] The invention is applicable to any type of installation, fixed or mobile, and to any vehicle.

Claims

Claims

1. Power and data transmission device, comprising a first circuit (100), a second circuit (200) and a cable (300) connecting the first circuit and the second circuit and comprising a first pair (301) and a second pair (302) of electrical conductors for transmitting a data signal and a power signal, the data signal being transmitted in differential mode in a first direction on the first pair of electrical conductors and in a second direction on the second pair of electrical conductors; characterized in that the first circuit is arranged to transmit in differential mode the power signal on a sinusoidal carrier using the common modes of the two pairs of conductors and the second circuit is arranged to receive said power signal while maintaining with respect to the cable a real impedance equal to an iterative impedance of the cable.

2. Device according to claim 1, in which the first circuit (100) comprises a first transformer (104) connected to the first pair (301) of electrical conductors, a second transformer (105) connected to the second pair (302) of electrical conductors, and a third transformer (106) in common mode on the two pairs of electrical conductors.

3. Device according to claim 1 or 2, in which the second circuit (200) comprises a first transformer (204) connected to the first pair (301) of electrical conductors, a second transformer (205) connected to the second pair (302) of electrical conductors, and a third transformer (206) in common mode on the two pairs of electrical conductors.

4. A device according to any preceding claim, wherein the first circuit (100) is arranged so that the power signal has an alternating voltage having a high frequency, preferably of the order of megahertz.

5. Device according to any one of the preceding claims, in which the second circuit (200) comprises: - an AC / DC converter (208) receiving as input the power signal and providing as output a DC power signal having a rectified voltage; - an electronic load arranged to be proportional to the rectified voltage.

6. Device according to claim 5, in which the AC / DC converter (208) is associated with a filter (207) arranged to attenuate switching noises of the AC / DC converter.

7. Device according to claim 6, in which the filter (207) comprises a common mode mutual inductance (2071, 2072).

8. Device according to any one of claims 5 to 7, in which the electronic load comprises a current consumer (209) following the rectified voltage and connected to the output of the AC / DC converter (208).

9. Device according to claim 8, comprising a low-pass filter (210) Pi arranged at the output of the current consumer (209) and adapted to the iterative impedance of the cable (300).

10. A device according to any one of claims 5 to 9, wherein the second circuit (200) comprises a Zener diode voltage regulator (212).

11. A device according to any one of claims 5 to 9, wherein the second circuit (200) comprises a low dropout linear voltage regulator (LDO).

12. Aircraft comprising a data processing apparatus connected to the first circuit (100) of a device according to any one of the preceding claims and at least one sensor connected to the second circuit (200) of this device.

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