ELECTRICAL INSTALLATION WITH TWO DIRECT VOLTAGE SOURCES, TWO NETWORKS AND AN INTERCONNECTION DEVICE

Abstract

The present invention relates to an electrical installation (102) for a mobility device (100), comprising: a first and a second direct voltage source; a first network (LV1) comprising a battery (BAT); a second network (LV2); an interconnection device (IT) comprising: first upstream (S11) and downstream (S12) switches, a second upstream switch (S21) and a junction switch (BP) and a control device (108) designed to, in response to detection of an undervoltage in the interconnection device (IT), control the opening of the downstream switch (S12) connected to the first network (LV1) to place the interconnection device (IT) in a so-called refuge configuration. Figure for the abstract: Fig. 2

Description

Title of the invention: ELECTRICAL INSTALLATION WITH TWO DIRECT VOLTAGE SOURCES, TWO NETWORKS AND AN INTERCONNECTION DEVICE Technical field of the invention

[0001] The present invention relates to an electrical installation with two direct voltage sources, two networks and an interconnection device, a mobility device comprising such an electrical installation, a method for controlling the interconnection device and a corresponding computer program.

[0002] A mobility device is, for example, a motorized land vehicle, a train, an aircraft or a drone. A motorized land vehicle is, for example, a motor vehicle, a motorcycle, a motorized bicycle or a motorized wheelchair.

[0003] In the description and claims which follow, an electrical voltage will be qualified as high voltage when it is greater than 100V, preferably greater than 150V, and low voltage when it is less than 100V. Technological background

[0004] An electrical installation comprising first and second direct voltage sources, as well as two networks supplied independently by one of the direct voltage sources, is known from the state of the art.

[0005] Thus, when one of the DC voltage sources fails, the network connected to this DC voltage source is no longer electrically supplied and the devices in this network stop functioning.

[0006] It may thus be desirable to provide an installation which makes it possible to overcome at least some of the aforementioned problems and constraints. Summary of the invention

[0007] An electrical installation is therefore proposed for a mobility device, comprising: - a first source of continuous voltage; - a second source of direct voltage; - a first network comprising a battery; - a second network; characterized in that it comprises: - an interconnection device comprising: • first upstream and downstream switches connected to each other at a first midpoint, the first upstream switch being connected between the first direct voltage source and the first in downstream switch, the first downstream switch being connected between the first upstream switch and the first network, • a second upstream switch connected between the second direct voltage source and the second network, and • a junction switch connected between the first midpoint and a second midpoint located between the second upstream switch and the second network; and - a control device designed for, the interconnection device being in a so-called fallback configuration in which one of the upstream switches is open, the other switches being closed so that the direct voltage source connected to the closed upstream switch is connected to the two networks to supply them electrically: • in response to detection of an undervoltage in the interconnection device, command the opening of the downstream switch connected to the first network to place the interconnection device in a so-called refuge configuration.

[0008] Thus, thanks to the invention, it is possible not only to place the interconnection device in the fallback position so that the valid DC voltage source electrically supplies the two networks, but also to effectively manage a failure in the interconnection device detected by the presence of an undervoltage in the latter, whatever the DC voltage source initially failed and without knowing precisely the origin of the new failure. Indeed, by first opening the downstream switch connected to the network equipped with a battery, either this network is faulty and the opening of the switch makes it possible to isolate it to preserve the electrical supply of the other network, or the network is not faulty and is therefore not the cause of the detected undervoltage, and the opening of the switch makes it possible to isolate it so that its battery electrically supplies the equipment (loads) present on this network.

[0009] The invention may further comprise one or more of the following optional features, in any technically possible combination.

[0010] Optionally, the semiconductor switches used have an intrinsic diode or a parallel diode, passing towards the respective midpoint (cathode connected to the respective midpoint).

[0011] Also optionally, the junction switch comprises two unidirectional switches each having an intrinsic diode or one added in parallel, the two unidirectional switches being connected in series, with either each of the diodes passing towards the other, or each of the diodes blocking towards the other.

[0012] Also optionally, the interconnection device being initially in a so-called normal configuration in which the junction switch is open and the other switches closed, the control device is designed to: in response to a detection that one of the DC voltage sources has failed, controlling the opening of the upstream switch connected to the failed DC voltage source to place the interconnection device in the fallback configuration.

[0013] Also optionally, the control device is designed, while the interconnection device is in the fallback configuration, to: check whether the midpoints are undervoltage, i.e. whether they have voltages lower than a predefined threshold; then if at least one of the midpoints is undervoltage, command the opening of the junction switch to switch the interconnection device to a so-called degraded configuration.

[0014] Also optionally, the control device is designed, while the interconnection device is in degraded configuration, to: check if the second midpoint is undervoltage; then if the second midpoint is undervoltage, command the opening of all closed switches.

[0015] Also optionally, the electrical installation further comprises a second downstream switch connected between the second midpoint and the second network.

[0016] Also optionally, the control device is designed, in order to control the opening of all closed switches, to: control the opening of the second downstream switch; then check if the second midpoint is undervoltage and record the result; then control the opening of the second upstream switch.

[0017] Also optionally, the interconnection device being in the fallback configuration with the second upstream switch open, the control device is designed, if at least one of the midpoints is undervoltage, to control the opening of all the closed switches.

[0018] Also optionally, the control device is designed, in order to control the opening of all closed switches, to: control the opening of the junction switch; then control the opening of the second downstream switch; then control the opening of the first upstream switch.

[0019] Also optionally, the control device is designed to, between the command to open the junction switch and the command to open the second downstream switch and / or between the command to open the second downstream switch and the command to open the first upstream switch, check whether the midpoints are undervoltage and record the result.

[0020] Also optionally, the control device is designed, in order to control the opening of all the closed switches, to simultaneously control the opening of all the closed switches.

[0021] Also optionally, the second network is battery-free.

[0022] A mobility device comprising an electrical installation according to the invention is also proposed.

[0023] There is also provided a method for controlling an interconnection device located between first and second DC voltage sources and a first and second network, the first network comprising a battery, the interconnection device comprising: - first upstream and downstream switches connected to each other at a first midpoint, the first upstream switch being connected between the first direct voltage source and the first downstream switch, the first downstream switch being connected between the first upstream switch and the first network, - a second upstream switch connected between the second direct voltage source and the second network, and - a junction switch connected between the first midpoint and a second midpoint located between the second upstream switch and the second network; the method comprising, the interconnection device being in a so-called fallback configuration in which one of the upstream switches is open, the other switches being closed so that the direct voltage source connected to the closed upstream switch is connected to the two networks to supply them electrically: - in response to detection of an undervoltage in the interconnection device, command the opening of the downstream switch connected to the first network to place the interconnection device in a so-called refuge configuration.

[0024] There is also provided a computer program downloadable from a communication network and / or recorded on a computer-readable medium, characterized in that it comprises instructions for executing the steps of a method according to the invention, when said program is executed on a computer. Brief description of the figures

[0025] The invention will be better understood with the aid of the following description, given solely by way of example and with reference to the appended drawings in which: - [Fig.l] is a very simplified side view of a mobility device comprising an electrical installation according to the invention, - [Fig.2] is a simplified electrical circuit of the electrical installation, illustrating in particular an interconnection device, - [Fig.3] is a block diagram of a first method of controlling the interconnection device, - [Fig.4] illustrates an interconnection device configuration at one of the steps of the first control method, - [Fig.5] illustrates an interconnection device configuration at one of the steps of the first control method, - [Fig.6] illustrates an interconnection device configuration at one of the steps of the first control method, - [Fig.7] illustrates an interconnection device configuration at one of the steps of the first control method, - [Fig.8] illustrates an interconnection device configuration at one of the steps of the first control method, - [Fig.9] illustrates an interconnection device configuration at one of the steps of the first control method, - [Fig. 10] is a block diagram of a second method of controlling the interconnection device, - [Fig. 11] illustrates an interconnection device configuration at one of the steps of the second control method, - [Fig. 12] illustrates an interconnection device configuration at one of the steps of the second control method, - [Fig. 13] illustrates an interconnection device configuration at one of the steps of the second control method, - [Fig. 14] illustrates an interconnection device configuration at one of the steps of the second control method, - [Fig. 15] illustrates an interconnection device configuration at one of the steps of the second control method, and - [Fig. 16] is a simplified electrical circuit illustrating a variant of the interconnection device. Detailed description of the invention

[0026] With reference to [Fig.l], a mobility device 100 in which the invention can be implemented will now be described. The mobility device 100 is for example a motor vehicle as illustrated.

[0027] The mobility device 100 comprises an electrical installation 102 comprising first and second direct voltage sources, hereinafter called sources SCI and SC2, designed to respectively supply direct voltages VB1, VB2.

[0028] For example, the first source SCI comprises a first battery BATI designed to provide a direct voltage VBati and a first direct-direct voltage converter DCDC1 designed to convert the direct voltage VBati into the direct voltage VB1. Similarly, the second source SC2 comprises a second battery BATI designed to provide a direct voltage VBAt2 and a second direct-direct voltage converter DCDC2 designed to convert the direct voltage VBAt2 into the direct voltage VB2.

[0029] The DC voltages VBAti, VBAt2 are for example equal to each other, for example equal to 400V.

[0030] For example, the BATI, BAT2 batteries comprise cells or accumulators in series. For example, the cells of the BATI, BAT2 batteries are lithium-ion cells or lithium-iron-phosphate cells known as LFP cells or lithium nickel-manganese-cobalt cells known as NMC cells. For example, the BATI, BAT2 batteries comprise the same number N of cells or accumulators in series. Alternatively, the BATI, BAT2 batteries may comprise a different number of cells or accumulators in series.

[0031] The first and second batteries BATI, BAT2 are for example connected in series with each other, so as to form a battery system 104 designed to provide a continuous voltage VBAt, from the voltages Vbath VBAt2, for example the sum of the voltages VBATb VBAt2- This voltage VBAt is for example a high voltage, for example 800V.

[0032] In other embodiments, the two sources SCI, SC2 can share the same battery providing a direct voltage. In this case, the two converters DCDC1, DCDC2 are connected to this shared battery to receive the direct voltage provided by the latter.

[0033] The mobility device 100 may comprise an electric propulsion motor 106. In this case, the battery system 104 is for example designed to electrically power the electric motor 106 from the voltage VBAt-

[0034] Furthermore, the electrical installation 102 further comprises a first network LV1 designed to be electrically powered by a direct voltage VI, as well as a second network LV2 designed to be powered by a direct voltage V2. The voltages VI, V2 of the networks LV1, LV2 are for example low voltages. Also for example, the voltages VI, V2 are equal.

[0035] The first network LV 1 comprises a battery BAT and loads Zl, while the second LV2 network is preferably without battery, but has Z2 loads.

[0036] The BAT battery is designed to be charged from the source SCI, SC2 supplying electricity to the LV1 network and to itself supply the ZI loads of this LV1 network. For this, the BAT battery is for example designed to store a quantity of electrical energy sufficient to deliver 1 kW for two minutes.

[0037] When it is said that the second LV2 network is without a battery, this means at a minimum that it is without a battery designed to power the loads Z2 of the LV2 network and / or capable of storing a quantity of electrical energy sufficient to deliver 1 kW for two minutes. Thus, the LV2 network may comprise electrical capacitors which are therefore not batteries within the meaning of the present invention.

[0038] For example, the voltage VBat is referenced relative to a first ground GND1, while the voltages VB1, VB2, VI, V2 are referenced relative to a second ground GND2, different from the first ground GND1 (see [Fig.4]).

[0039] The mobility device 100 further comprises an IT interconnection device designed to connect the sources SCI, SC2 to the networks LV1, LV2, according to different configurations which will be detailed later.

[0040] With reference to [Fig.2], an exemplary embodiment of the IT interconnection device will now be described.

[0041] The interconnection device IT firstly comprises a first connection between the first source SCI and the first network LV1. This first connection comprises first upstream switches SI 1 and downstream switches S12 connected to each other at a first midpoint PL. The first upstream switch SI 1 is connected between the first source SCI and the first downstream switch S12, while the latter is connected between the first upstream switch SI 1 and the first network LV1.

[0042] The interconnection device IT further comprises a second link between the second source SC2 and the second network LV2. This second link comprises a second upstream switch S21 connected between the second source SC2 and the second network LV2.

[0043] The interconnection device IT further comprises a junction switch BP connected between the first and second links, and more precisely between the first midpoint PI and a second midpoint P2 located between the second upstream switch S21 and the second network LV2.

[0044] The second connection may further comprise, as in the example illustrated in [Fig. 2], a second downstream switch S22 connected between the second midpoint P2 and the second network LV2. The second upstream switches S21 and downstream switches S22 are then connected to each other at the second midpoint P2. As will be described with reference to [Fig. 16], this second downstream switch S22 may be omitted.

[0045] The controllable switches SI 1, S12, S21, S22 are for example unidirectional switches designed to, when open, interrupt the current in one direction only, but not in the other direction. More precisely, each upstream switch SU, S12 is then designed to interrupt the current flowing from the midpoint PI, P2 to the source SCI, SC2 that it connects. Furthermore, each downstream switch S21, S22 is designed to interrupt the current flowing from the midpoint PI, P2 to the network LV1, LV2 that it connects.

[0046] For example, each controllable switch S11, S12, S21, S22 is a semiconductor switch, such as a transistor, such as for example a metal-oxide gate field effect transistor (also designated by the acronym MOSFET) or a silicon metal-oxide gate field effect transistor (also designated by the acronym Si MOSFET) or a silicon carbide metal-oxide gate field effect transistor (also designated by the acronym SiC MOSFET) or an insulated gate bipolar transistor (also designated by the acronym IGBT) or a gallium nitride field effect transistor (also designated by the acronym IGBT). English: "Gallium Nitride Field Effect Transistor" also designated bythe acronym GaN FET). The semiconductor switches used usually have an intrinsic diode or a diode in parallel. In this case, the diode is conductive to the respective PI, P2 midpoint (cathode connected to the respective PI, P2 midpoint).

[0047] The junction switch BP is preferably a bidirectional switch designed to, when open, interrupt the current in both directions. The junction switch BP comprises, for example, two unidirectional switches BPI, BP2 arranged head to tail in series, with, for example, an inductance L between them. Indeed, in the case where a fault appears on one of the two connections, the presence of the inductance L can slow down a propagation of this fault towards the other connection. This inductance L can be omitted, so that the unidirectional switches BPI, BP2 are directly connected to each other. The switch BPI is connected to the midpoint PI, while the switch BP2 is connected to the midpoint P2. These unidirectional switches BPI, BP2 are, for example, semiconductor switches, as detailed above, generally having an intrinsic diode or else added in parallel.In this case, the diodes are in opposite directions, that is to say either each passing towards the other (cathodes connected to each other), or each blocking towards the other (anodes connected to each other, as in the example illustrated).

[0048] The electrical installation further comprises a device 108 for controlling the IT interconnection device.

[0049] To control the interconnection device IT, the control device 108 is in particular designed to detect, on the one hand, a failure of each of the sources SCI, SC2, in particular of their converter DCDC1, DCDC2, and, on the other hand, an undervoltage appearing in the interconnection device IT.

[0050] For this, the electrical installation 102 comprises, for example, voltage sensors Cupi, CUP2, CVBb Cvi, CVb2, Cv2 designed to respectively measure the voltages UP1, UP2 at the midpoints PI, P2, as well as the voltages VB1, VI, VB2, V2. The electrical installation 102 may further comprise current sensors C1Bi, C1B2 designed to respectively measure the currents IB1, IB2 supplied by the sources SCI, SC2 to the interconnection device IT, these currents IB1, IB2 passing in particular respectively through the upstream switches SU, S21.

[0051] To detect a failure of one of the sources SCI, SC2, the control device 108 is thus for example designed to use the voltage and / or current measurements to detect an overvoltage or an undervoltage on one of the voltages VB1, VB2, an overcurrent on one of the currents IB1, IB2. The control device 108 can also be designed to monitor a signal, for example a current or a voltage, internal to each converter DCDC1, DCDC2, in order to detect a failure when this signal has an abnormal value.

[0052] For example, an undervoltage is detected when the voltage considered falls below a predefined threshold, for example 90% of a nominal value of the voltage considered. Similarly, an overvoltage is for example detected when the voltage considered falls above a predefined threshold, for example the same as for the detection of the undervoltage.

[0053] Similarly, an overcurrent is for example detected when the current considered passes above a predefined threshold.

[0054] The control device 108 is for example a computer device, such as a computer or a set of computers, comprising a processing unit, such as a microprocessor, and a main memory designed to store instructions of a computer program so that the processing unit executes them to implement the steps which will be described later.

[0055] With reference to [Fig. 3] to 9, an exemplary method 300 of operating the control device 108 will now be described.

[0056] With reference to [Fig. 4], during a step 302, the interconnection device IT is initially in a so-called normal configuration in which the junction switch BP is open, while the other switches SU, S12, S21, S22 are closed. Thus, the first source SCI electrically supplies the first network LV1 and the second source SC2 electrically supplies the second network LV2, separately.

[0057] During a step 304, the control device 108 detects a failure of one of the sources SCI, SC2, for example of one of the converters DCDC1, DCDC2. In FIGS. 3 to 9, the case of a failure of the first source SCI is illustrated.

[0058] With reference to [Fig. 5], in response to the detection of the failure of the first source SCI, the control device 108 controls, during a step 306, the opening of the first upstream switch SI 1 connected to the faulty source SCI and the closing of the junction switch BP to place the interconnection device IT in a so-called fallback configuration. Generally, in the fallback position, the upstream switch SI 1 or S21 connected to the faulty source SCI or SC2 is open, while the other switches are closed, in particular the junction switch BP. Thus, the still valid source SCI or SC2 is connected to the two networks LV1, LV2 to supply them electrically. In particular, the battery BAT can be charged by the still valid source SCI or SC2.

[0059] During a step 308, the control device 108 detects an undervoltage in the interconnection device IT, in particular an undervoltage of at least one of the voltages VB1, VP1, VI, VB2, VP2, V2.

[0060] With reference to [Fig. 6], in response to the detection of the undervoltage, the control device 108 controls, during a step 310, the opening of the downstream switch S12 connected to the first network LV1 to place the interconnection device IT in a so-called refuge configuration. Generally, in this refuge configuration, the upstream switch SU or S21 connected to the faulty source SCI or SC2 is open, as is the downstream switch S12 connected to the network LV1 provided with the battery BAT, while the other switches are closed. Thus, if the network LV1 is faulty, in particular if it has a short circuit to the second electrical ground GND2, the opening of the downstream switch S12 makes it possible to isolate the network LV1 to preserve the electrical supply of the network LV2.Furthermore, if the LV1 network is not faulty and therefore is not the cause of the detected undervoltage, the BAT battery electrically supplies the Zl loads, so that the LV1 network is still functional. Thus, first ordering the opening of the downstream switch S12, even without knowing the origin of the fault, is interesting.

[0061] During a step 312, the control device 108 checks whether the midpoints PI, P2 are undervoltage or not.

[0062] If the midpoints PI, P2 are not undervoltage, this means that the fault came from the LV1 network and that the opening of the downstream switch S12 made it possible to isolate this fault. The control device 108 then leaves, during a step 314, the interconnection device IT in the refuge configuration, as illustrated in [Fig. 6]. The latter is for example left for several minutes, for example example until the next stop of the motor vehicle or until the electrical installation 102 is repaired.

[0063] On the other hand, with reference to [Fig.7], if at least one of the midpoints PI, P2 is undervoltage, this means that the fault is external to the LV1 network. The control device 108 then commands, during a step 316, the opening of the junction switch BP to switch the interconnection device IT into a so-called degraded configuration. The purpose of this opening is to try to save the power supply to the LV2 network by the source SC2, if it is the upstream switch SI 1 which is faulty or, when the downstream switch S12 is unidirectional, to avoid a discharge of the battery BAT through the downstream switch S12 if the fault is located between the source SC2 and the LV2 network.

[0064] During a step 318, the control device 108 checks whether the second midpoint P2 is undervoltage.

[0065] If the second midpoint P2 is not undervoltage, opening the junction switch BP has made it possible to isolate the fault. The control device 108 then leaves, during a step 320, the interconnection device IT in the degraded configuration. The latter is for example left for several minutes, for example until the next stop of the motor vehicle or until the electrical installation 102 is repaired.

[0066] On the other hand, if the second midpoint P2 is undervoltage, the fault is located between the source SC2 and the network LV2. It is therefore not possible to save the latter. The control device 108 then commands, during a step 322, the opening of all the switches which are still closed, that is to say the switches SI 1, S22, to switch the interconnection device IT to a so-called stop configuration (all the switches SU, S12, S21, S22, BP open).

[0067] Preferably, step 322 comprises the following steps.

[0068] With reference to [Fig.8], during a step 322-2, the control device 108 commands the opening of the second downstream switch S22. If the downstream switch S22 is not present, this step is of course not carried out. Instead, the source SC2 is preferably deactivated, for example by deactivating the second converter DCDC2.

[0069] During a step 322-4 the control device 108 checks whether the second midpoint P2 is undervoltage and records the result in a memory. This information is useful for maintenance, in order to be able to identify the origin of the failure.

[0070] With reference to [Fig.9], during a step 322-6, the control device 108 controls the opening of the first upstream switch SI 1.

[0071] Then, in the case where the downstream switch S22 is present, the second source SC2 is preferably disabled, for example by disabling the second DCDC2 converter.

[0072] With reference to [Fig. 10] to 15, a method 1000 of operating the control device 108 will now be described, in the case where it is the second source SC2 which is faulty. The steps common to the method 300 will not be described again in detail.

[0073] With reference to [Fig. 11], following steps 302 and 304 and in response to the detection of the failure of the first source SCI, the control device 108 controls, during step 306, the opening of the upstream switch S21 connected to the faulty source SC2 to place the interconnection device IT in the fallback configuration.

[0074] During step 308, the control device 108 detects an undervoltage in the interconnection device IT.

[0075] With reference to [Fig. 12], in response to the detection of the undervoltage, the control device 108 controls, during step 310, the opening of the downstream switch S12 connected to the first network LV1 to place the interconnection device IT in the refuge configuration.

[0076] During step 312, the control device 108 checks whether the midpoints PI, P2 are not undervoltage.

[0077] If the midpoints PI, P2 are not undervoltage, the control device 108 leaves, during step 314, the interconnection device IT in the refuge configuration.

[0078] On the other hand, with reference to [Fig. 13], if at least one of the midpoints PI, P2 is undervoltage, the control device 108 controls, during a step 1002, the opening of all the switches which are still closed, namely BP, S22, SU, to put the interconnection device IT into the stop configuration.

[0079] Preferably, the switches BP, S22, SI 1 are opened according to the same sequence as that provided in the method 300, that is to say: step 1002-2 of controlling the opening of the junction switch BP ([Fig. 14]), then step 1002-4 of controlling the opening of the second downstream switch S22, if present ([Fig. 13]), then step 1002-6 of controlling the opening of the first upstream switch SU ([Fig.14]).

[0080] Preferably, during a step 1002-3 between steps 1002-2 and 1002-4, the control device 108 checks whether the second midpoint P2 is undervoltage and records the result in a memory. This information is useful for maintenance, in order to be able to identify the origin of the failure.

[0081] Also preferably, during a step 1002-5 between steps 1002-4 and 1002-6, the control device 108 checks whether the first midpoint PI is undervoltage and records the result in a memory. This information is useful for maintenance, in order to be able to identify the origin of the failure.

[0082] After step 1002, the first source SCI is preferably deactivated, for example by deactivating the first converter DCDC1.

[0083] Thus, as can be seen, the complete sequence of opening / closing the switches from the normal configuration to the shutdown configuration is similar regardless of the faulty source SCI, SC2: opening of the upstream switch SU or S21 connected to the faulty source SCI or SC2 and closing of the junction switch BP; then opening of the downstream switch S12 connected to the network LV1 equipped with the battery BAT; then opening of the junction switch BP; then opening of the downstream switch S22; then opening of the upstream switch SU or S21 connected to the source SCI or SC2 still valid. Having the same switch control algorithm regardless of the faulty source makes it possible to simplify its certification.

[0084] Alternatively, the switches BP, S22, S11 are simultaneously commanded to open in step 1002.

[0085] Furthermore, in order to be able to identify the origin of the failure subsequently, the control device 108 can be designed to check whether the midpoints PI, P2 are undervoltage and record the result in a memory, between steps 1002-2 and 1002-4 and / or between steps 1002-4 and 1002-6.

[0086] With reference to [Fig. 16], as indicated previously, the second downstream switch S22 can be omitted, in particular when the LV2 network is without a battery. Indeed, the downstream switch SI 1 is provided to prevent untimely charging of the battery BAT if the source SCI, SC2 supplying the LV1 network were to start supplying current in an uncontrolled manner. However, since the LV2 network is without a battery, this risk is non-existent for the LV2 network, so that the downstream switch S22 is not essential.

[0087] The methods 300, 1000 can still be applied in the case of the structure of [Fig.16], except that the steps of opening / closing the second downstream switch S22 are of course omitted.

[0088] In conclusion, it will be noted that the invention is not limited to the embodiments described above. It will indeed appear to those skilled in the art that various modifications can be made to the embodiments described above, in light of the teaching which has just been disclosed to them.

[0089] In the detailed presentation of the invention which is given above, the terms used must not be interpreted as limiting the invention to the embodiments set out in the present description, but must be interpreted to include all equivalents whose prediction is within the reach of those skilled in the art by applying their general knowledge to the implementation of the teaching which has just be disclosed to him.

Claims

Claims

1. Electrical installation (102) for a mobility device (100), comprising: - a first direct voltage source (SCI); - a second direct voltage source (SC2); - a first network (LV1) comprising a battery (BAT); - a second network (LV2); characterized in that it comprises: - an interconnection device (IT) comprising: • first upstream (SI 1) and downstream (S 12) switches connected to each other at a first midpoint (PI), the first upstream switch (SI 1) being connected between the first direct voltage source (SCI) and the first downstream switch (S 12), the first downstream switch (S 12) being connected between the first upstream switch (S 11) and the first network (LV1), • a second upstream switch (S21) connected between the second direct voltage source (SC2) and the second network (LV2), and • a junction switch (BP) connected between the first midpoint (PI) and a second midpoint (P2) located between the second upstream switch (S21) and the second network (LV2); and - a control device (108) designed for, the interconnection device (IT) being in a so-called fallback configuration in which one of the upstream switches (SU, S21) is open, the other switches being closed so that the direct voltage source (SCI, SC2) connected to the closed upstream switch (SI 1, S21) is connected to the two networks (LV1, LV2) to supply them electrically: • in response to detection of an undervoltage in the interconnection device (IT), controlling the opening of the downstream switch (S 12) connected to the first network (LV1) to place the interconnection device (IT) in a so-called fallback configuration

2.

3.

4.

5. refuge. Electrical installation (102) according to claim 1, in which the junction switch (BP) comprises two unidirectional switches (BPI, BP2) each having an intrinsic diode or added in parallel, the two unidirectional switches (BPI, BP2) being mounted in series, with either each of the diodes passing towards the other, or each of the diodes blocking towards the other. Electrical installation (102) according to claim 1 or 2, in which, the interconnection device (IT) being initially in a so-called normal configuration in which the junction switch (BP) is open and the other switches (SU, S12, S21, S22) closed, the control device (108) is designed to: - in response to detection that one of the DC voltage sources (SCI, SC2) is faulty, command the opening of the upstream switch (SU, S21) connected to the faulty DC voltage source (SCI, SC2) to place the interconnection device (IT) in the fallback configuration. Electrical installation (102) according to any one of claims 1 to 3, in which the control device (108) is designed, while the interconnection device (IT) is in fallback configuration, to: - check (312) whether the midpoints (PI, P2) are undervoltage, i.e. whether they have voltages lower than a predefined threshold; then - if at least one of the midpoints (PI, P2) is undervoltage, command (316) the opening of the junction switch (BP) to switch the interconnection device (IT) to a so-called degraded configuration. Electrical installation (102) according to claim 4, in which the control device (108) is designed, while the interconnection device (IT) is in degraded configuration, to: check (318) if the second midpoint (P2) is undervoltage; then - if the second midpoint (P2) is undervoltage, command (322) the opening of all the closed switches (S22, S21).

6. Electrical installation (102) according to any one of claims 1 to 5, further comprising a second downstream switch (S22) connected between the second midpoint (P2) and the second network (LV2).

7. Electrical installation (102) according to claims 5 and 6, in which the control device (108) is designed, in order to control (322) the opening of all the closed switches (S22, S21), to: - control (322-2) the opening of the second downstream switch (S22); then - check (322-4) if the second midpoint (P2) is undervoltage and record the result; then - control (322-6) the opening of the second upstream switch (S21).

8. Electrical installation (102) according to any one of claims 1 to 7, in which, the interconnection device (IT) being in the fallback configuration with the second upstream switch (S21) open, the control device (108) is designed, if at least one of the midpoints (PI, P2) is undervoltage, to control (1002) the opening of all the closed switches (S22, BP, SU).

9. Electrical installation (102) according to claims 6 and 8, wherein the control device (108) is designed, in order to control (1002) the opening of all the closed switches (S22, BP, SU), to - control (1002-2) the opening of the junction switch (BP); then - control (1002-4) the opening of the second downstream switch (S22); then - control (1002-6) the opening of the first upstream switch (SU).

10. Electrical installation (102) according to claim 9, wherein the control device (108) is adapted to, between the control (1002-2) of the opening of the junction switch (BP) and the command (1002-4) of the opening of the second downstream switch (S22) and / or between the command (1002-4) of the opening of the second downstream switch (S22) and the command (1002-6) of the opening of the first upstream switch (SI 1), check whether the midpoints (PI, P2) are undervoltage and record the result.

11. Electrical installation (102) according to claims 6 and 8, wherein the control device (108) is designed, in order to control (1002) the opening of all the closed switches (S22, BP, SU), to simultaneously control the opening of all the closed switches (S22, BP, SU).

12. Electrical installation (102) according to any one of claims 1 to 11, in which the second network (LV2) is without a battery.

13. Mobility device (100) comprising an electrical installation (102) according to any one of claims 1 to 12.

14. Method (300; 1000) for controlling an interconnection device (IT) located between first and second direct voltage sources (SCI, SC2) and a first and second network (LV1, LV2), the first network (LV1) comprising a battery (BAT), the interconnection device (IT) comprising: - first upstream (SI 1) and downstream (S 12) switches connected to each other at a first midpoint (PI), the first upstream switch (SI 1) being connected between the first direct voltage source (SCI) and the first downstream switch (S 12), the first downstream switch (S 12) being connected between the first upstream switch (SI 1) and the first network (LV1), - a second upstream switch (S21) connected between the second direct voltage source (SC2) and the second network (LV2),and - a junction switch (BP) connected between the first midpoint (PI) and a second midpoint (P2) located between the second upstream switch (S21) and the second network (LV2); the method (300; 1000) comprising, the interconnection device (IT) being in a so-called fallback configuration in which one of the inter-, upstream breakers (SU, S21) is open, the other switches (SU, S21, S12, BP, S22) being closed so that the direct voltage source (SCI, SC2) connected to the closed upstream switch (SU, S21) is connected to the two networks (LV1, LV2) to supply them electrically: - in response to detection of an undervoltage in the interconnection device (IT), command the opening of the downstream switch (S 12) connected to the first network (LV1) to place the interconnection device (IT) in a so-called refuge configuration.

15. Computer program downloadable from a communications network and / or recorded on a computer-readable medium, characterized in that it comprises instructions for executing the steps of a method according to claim 14, when said program is executed on a computer.

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