Electrical installation with two DC voltage sources, two networks and an interconnection device

Abstract

The present invention relates to an electrical installation (102) for a mobility vehicle (100), comprising: a first DC voltage source and a second DC voltage source; a first network (LV1) having 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 command the opening of the downstream switch (S12) connected to the first network (LV1) in response to the detection of an undervoltage in the interconnection device (IT), in order to place the interconnection device (IT) in a so-called refuge configuration.

Description

Description TITLE: 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] Known from the state of the art is an electrical installation comprising first and second direct voltage sources, as well as two networks supplied independently by one of the direct voltage sources respectively.

[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 on this network stop working.

[0006] It may therefore 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 direct voltage source; a second direct voltage source; 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 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 DC 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 both networks, but also to effectively manage a failure in the interconnection device detected by the presence of an undervoltage in the latter, regardless of the DC voltage source initially faulty 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 opening 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 opening 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, conducting to 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 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.

[0001] Also optionally, the interconnection device being initially in a so-called normal configuration in which the junction switch is open and the other switches are closed, the control device is designed to: in response to detection that one of the DC voltage sources is faulty, control the opening of the upstream switch connected to the faulty 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 fallback configuration, to: check whether the midpoints are undervoltage, i.e. whether they have voltages below a predefined threshold; then if at least one of the midpoints is undervoltage, control the opening of the junction switch to switch the interconnection device into a so-called degraded configuration.

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

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

[0016] Also optionally, the control device is designed to control the opening of all closed switches, for: command the opening of the second downstream switch; then check whether the second midpoint is undervoltage and record the result; then command 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] Optionally also, 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] Optionally also, the control device is designed, in order to control the opening of all closed switches, to simultaneously control the opening of all 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 DC 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 DC 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 DC 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, controlling 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 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 the invention, when said program is executed on a computer.

[0025] For example, said computer program downloadable from a communication network and / or recorded on a computer-readable medium, is characterized in that it comprises instructions for executing the steps of a method according to the invention, when said program is executed by the electrical installation for a mobility device according to the invention.

[0026] Brief description of the figures

[0027] 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: Figure 1 is a very simplified side view of a mobility device comprising an electrical installation according to the invention, Figure 2 is a simplified electrical circuit of the electrical installation, illustrating in particular an interconnection device, Figure 3 is a block diagram of a first method of controlling the interconnection device, Figure 4 illustrates an interconnection device configuration at one of the steps of the first control method, Figure 5 illustrates an interconnection device configuration at one of the steps of the first control method, Figure 6 illustrates an interconnection device configuration at one of the steps of the first control method, Figure 7 illustrates an interconnection device configuration at one of the steps of the first control method, Figure 8 illustrates an interconnection device configuration at one of the steps of the first control method, Figure 9 illustrates an interconnection device configuration at one of the steps of the first control method, Figure 10 is a block diagram of a second method of controlling the interconnection device,Figure 11 illustrates an interconnection device configuration at one of the steps of the second control method, Figure 12 illustrates an interconnection device configuration at one of the steps of the second control method, Figure 13 illustrates an interconnection device configuration at one of the steps of the second control method, Figure 14 illustrates an interconnection device configuration at one of the steps of the second control method, Figure 15 illustrates an interconnection device configuration at one of the steps of the second control method, and Figure 16 is a simplified electrical circuit illustrating a variant of the interconnection device., Detailed description of the invention

[0028] With reference to FIG. 1, 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.

[0029] The mobility device 100 comprises an electrical installation 102 comprising first and second direct voltage sources, hereinafter called sources SC1 and SC2, designed to respectively supply direct voltages VB1, VB2.

[0030] For example, the first source SC1 comprises a first battery BAT 1 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 BAT 1 designed to provide a direct voltage V BT2 and a second DC-DC voltage converter DCDC2 designed to convert the DC voltage V BA T2 in the direct voltage VB2.

[0031] Direct voltages V BA TI, V BA T2 are for example equal to each other, for example equal to 400V.

[0032] For example, the BAT 1 , BAT2 batteries comprise cells or accumulators in series. For example, the cells of the BAT 1 , BAT2 batteries are lithium-ion cells or lithium-iron-phosphate cells called LFP cells or lithium nickel-manganese-cobalt cells called NMC cells. For example, the BAT 1 , BAT2 batteries comprise the same number N of cells or accumulators in series. Alternatively, the BAT1 , BAT2 batteries may comprise a different number of cells or accumulators in series.

[0033] The first and second batteries BAT 1 , BAT2 are for example connected in series with each other, so as to form a battery system 104 designed to provide a direct voltage V BA T, from the voltages V BA TI, V BA T2, for example the sum of the voltages V BA TI, V BA T2. This voltage V BA T is for example a high voltage, for example 800V.

[0034] In other embodiments, the two sources SC1, 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.

[0035] 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 VBAT voltage.

[0036] Furthermore, the electrical installation 102 further comprises a first network LV1 designed to be electrically powered by a direct voltage V1, as well as a second network LV2 designed to be powered by a direct voltage V2. The voltages V1, V2 of the networks LV1, LV2 are for example low voltages. Also for example, the voltages V1, V2 are equal.

[0037] The first network LV1 comprises a battery BAT and loads Z1, while the second network LV2 is preferably without a battery, but comprises loads Z2.

[0038] The BAT battery is designed to be charged from the SC1 source, SC2 supplying electricity to the LV1 network and to itself supply the Z1 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.

[0039] 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 supply the Z2 loads 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 include electrical capacities which are therefore not batteries within the meaning of the present invention.

[0040] For example, the voltage VBAT is referenced to a first ground GND1 , while the voltages VB1 , VB2, V1 , V2 are referenced to a second ground GND2, different from the first ground GND1 (see figure 4).

[0041] The mobility device 100 further comprises an IT interconnection device designed to connect the sources SC1, SC2 to the networks LV1, LV2, according to different configurations which will be detailed later.

[0042] With reference to Figure 2, an exemplary embodiment of the IT interconnection device will now be described.

[0043] The IT interconnection device firstly comprises a first link between the first source SC1 and the first network LV1. This first link comprises first upstream switches S11 and downstream switches S12 connected to each other. at a first midpoint P1. The first upstream switch S11 is connected between the first source SC1 and the first downstream switch S1, while the latter is connected between the first upstream switch S11 and the first network LV1.

[0044] The IT interconnection device 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.

[0045] The IT interconnection device further comprises a junction switch BP connected between the first and second links, and more precisely between the first midpoint P1 and a second midpoint P2 located between the second upstream switch S21 and the second network LV2.

[0046] The second connection may further comprise, as in the example illustrated in Figure 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 Figure 16, this second downstream switch S22 may be omitted.

[0047] The controllable switches S11, 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 S11, S12 is then designed to interrupt the current flowing from the midpoint P1, P2 to the source SC1, SC2 that it connects. Furthermore, each downstream switch S21, S22 is designed to interrupt the current flowing from the midpoint P1, P2 to the network LV1, LV2 that it connects.

[0048] For example, each controllable switch S11, S12, S21, S22 is a semiconductor switch, such as a transistor, such as a metal-oxide gate field effect transistor (also known by the acronym MOSFET) or a metal-oxide silicon gate field effect transistor (also known by the acronym MOSFET). Silicon Metal Oxide Semiconductor Field Effect Transistor (also referred to by the acronym Si MOSFET) or a silicon carbide metal-oxide gate field effect transistor (from the English "Silicon Carbide Metal Oxide Semiconductor Field Effect Transistor" also referred to by the acronym SiC MOSFET) or an insulated gate bipolar transistor (from the English "Insulated Gate Bipolar Transistor" also referred to by the acronym IGBT) or a gallium nitride field effect transistor (also referred to by the acronym GaN FET). The semiconductor switches used generally have an intrinsic diode or a diode in parallel. In this case, the diode is conductive to the respective midpoint P1, P2 (cathode connected to the respective midpoint P1, P2).

[0049] 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 BP1, BP2 arranged head to tail in series, with, for example, an inductance L between them. Indeed, in the event that 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 BP1, BP2 are directly connected to each other. The switch BP1 is connected to the midpoint P1, while the switch BP2 is connected to the midpoint P2. These unidirectional switches BP1, BP2 are, for example, semiconductor switches, as detailed above, generally having an intrinsic diode or 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).

[0050] The electrical installation further comprises a device 108 for controlling the IT interconnection device.

[0051] 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 SC1, SC2, in particular of their converter DCDC1, DCDC2, and, on the other hand, an undervoltage appearing in the interconnection device IT.

[0052] For this, the electrical installation 102 comprises, for example, voltage sensors CUPI, CUP2, C BI, CI, C B2, C 2 designed to respectively measure the voltages LJP1, LJP2 at the midpoints P1, P2, as well as the voltages VB1, V1, VB2, V2. The electrical installation 102 may further comprise current sensors CIBI, CIB2 designed to respectively measure the currents IB1, IB2 supplied by the sources SC1, SC2 to the interconnection device IT, these currents IB1, IB2 passing in particular respectively through the upstream switches S11, S21.

[0053] To detect a failure of one of the sources SC1, 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.

[0054] For example, an undervoltage is detected when the voltage in question falls below a predefined threshold, for example 90% of a nominal value of the voltage in question. Similarly, an overvoltage is for example detected when the voltage in question rises above a predefined threshold, for example the same as for undervoltage detection.

[0055] Similarly, an overcurrent is, for example, detected when the current in question exceeds a predefined threshold.

[0056] The control device 108 is for example a computer device, such as a calculator or a set of calculators, 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.

[0057] With reference to FIGS. 3 to 9, an exemplary method 300 of operating the control device 108 will now be described.

[0058] 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 S11, S12, S21, S22 are closed. Thus, the first source SC1 electrically supplies the first network LV1 and the second source SC2 electrically supplies the second network LV2, separately.

[0059] During a step 304, the control device 108 detects a failure of one of the sources SC1, SC2, for example of one of the converters DCDC1, DCDC2. In Figures 3 to 9, the case of a failure of the first source SC1 is illustrated.

[0060] With reference to FIG. 5, in response to the detection of the failure of the first source SC1, the control device 108 controls, during a step 306, opening the first upstream switch S11 connected to the faulty source SC1 and closing the junction switch BP to place the interconnection device IT in a so-called fallback configuration. Generally, in the fallback position, the upstream switch S11 or S21 connected to the faulty source SC1 or SC2 is open, while the other switches are closed, in particular the junction switch BP. Thus, the still valid source SC1 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 SC1 or SC2.

[0061] 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, V1, VB2, VP2, V2.

[0062] With reference to Figure 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 S11 or S21 connected to the faulty source SC1 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 power 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 Z1 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.

[0063] During a step 312, the control device 108 checks whether the midpoints P1, P2 are undervoltage or not.

[0064] If the midpoints P1, 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 Figure 6. The latter is for example left several minutes, for example until the next stop of the motor vehicle or until the electrical installation 102 is repaired.

[0065] On the other hand, with reference to Figure 7, if at least one of the midpoints P1, 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 S11 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.

[0066] During a step 318, the control device 108 checks whether the second midpoint P2 is undervoltage.

[0067] If the second midpoint P2 is not undervoltage, opening the junction switch BP has isolated 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.

[0068] 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 S11, S22, to switch the interconnection device IT to a so-called stop configuration (all the switches S11, S12, S21, S22, BP open).

[0069] Preferably, step 322 comprises the following steps.

[0070] Referring to Figure 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 performed. Instead, the source SC2 is preferably deactivated, for example by deactivating the second converter DCDC2.

[0071] 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.

[0072] With reference to figure 9, during a step 322-6, the control device 108 controls the opening of the first upstream switch S11.

[0073] Then, in the case where the downstream switch S22 is present, the second source SC2 is preferably deactivated, for example by deactivating the second converter DCDC2.

[0074] With reference to figures 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.

[0075] With reference to figure 11, following steps 302 and 304 and in response to the detection of the failure of the first source SC1, 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.

[0076] During step 308, the control device 108 detects an undervoltage in the IT interconnection device.

[0077] With reference to figure 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.

[0078] During step 312, the control device 108 checks whether the midpoints P1, P2 are not undervoltage.

[0079] If the midpoints P1, P2 are not undervoltage, the control device 108 leaves, during step 314, the interconnection device IT in the refuge configuration.

[0080] On the other hand, with reference to figure 13, if at least one of the midpoints P1, 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, S11, to switch the interconnection device IT into the stop configuration.

[0081] Preferably, the switches BP, S22, S11 are opened according to the same sequence as that provided in the method 300, that is to say: step 1002-2 of commanding opening of the junction switch BP (figure 14), then step 1002-4 of commanding opening of the second downstream switch S22, if present (figure 13), then step 1002-6 of commanding opening of the first upstream switch S11 (figure 14).

[0082] 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 fault.

[0083] Also preferably, during a step 1002-5 between steps 1002-4 and 1002-6, the control device 108 checks whether the first midpoint P1 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 fault.

[0084] After step 1002, the first source SC1 is preferably deactivated, for example by deactivating the first converter DCDC1.

[0085] Thus, as can be seen, the complete sequence of opening / closing of the switches from the normal configuration to the shutdown configuration is similar regardless of the faulty source SC1, SC2: opening of the upstream switch S11 or S21 connected to the faulty source SC1 or SC2 and closing of the junction switch BP; then opening of the downstream switch S12 connected to the LV1 network equipped with the BAT battery; then opening of the junction switch BP; then opening of the downstream switch S22; then opening of the upstream switch S11 or S21 connected to the source SC1 or SC2 still valid. Having the same switch control algorithm regardless of the faulty source makes it possible to simplify its certification.

[0086] Alternatively, switches BP, S22, S11 are simultaneously commanded to open at step 1002.

[0087] Furthermore, in order to be able to identify the origin of the fault later, the control device 108 can be designed to check whether the midpoints P1, 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.

[0088] With reference to Figure 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 S11 is provided to prevent untimely charging of the battery BAT if the source SC1, 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.

[0089] The methods 300, 1000 can still be applied in the case of the structure of figure 16, except that the steps of opening / closing the second downstream switch S22 are of course omitted.

[0090] 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.

[0091] In the detailed presentation of the invention given above, the terms used should not be interpreted as limiting the invention to the embodiments set forth in this description, but should be interpreted to include all equivalents the prediction of which is within the reach of those skilled in the art by applying their general knowledge to the implementation of the teaching just disclosed to them.

Claims

Claims [1] Electrical installation (102) for a mobility device (100), comprising: a first direct voltage source (SC1); 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 (S11) and downstream (S12) switches connected to each other at a first midpoint (P1), the first upstream switch (511) being connected between the first direct voltage source (SC1) and the first downstream switch (S12), the first downstream switch (512) being connected between the first upstream switch (S11) 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 (P1) 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 (S11, S21) is open, the other switches being closed so that the DC voltage source (SC1, SC2) connected to the closed upstream switch (S11, 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 (S12) connected to the first network (LV1) to place the interconnection device (IT) in a so-called refuge configuration. [2] Electrical installation (102) according to claim 1, in which the junction switch (BP) comprises two unidirectional switches (BP1, BP2) each having an intrinsic diode or added in parallel, the two unidirectional switches (BP1, BP2) being mounted in series, with either each of the diodes passing towards each other, or each of the blocking diodes towards the other. [3] 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 (S11, S12, S21, S22) closed, the control device (108) is designed to: in response to a detection that one of the DC voltage sources (SC1, SC2) is faulty, control the opening of the upstream switch (S11, S21) connected to the faulty DC voltage source (SC1, SC2) to place the interconnection device (IT) in the fallback configuration. [4] 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 (P1, P2) are undervoltage, i.e. whether they have voltages lower than a predefined threshold; then if at least one of the midpoints (P1, P2) is undervoltage, control (316) the opening of the junction switch (BP) to switch the interconnection device (IT) into a so-called degraded configuration. [5] 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) whether the second midpoint (P2) is undervoltage; then if the second midpoint (P2) is undervoltage, control (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) whether the second midpoint (P2) is undervoltage and record the result; then command (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 (P1, P2) is undervoltage, to control (1002) the opening of all the closed switches (S22, BP, S11). [9] Electrical installation (102) according to claims 6 and 8, in which the control device (108) is designed, in order to control (1002) the opening of all the closed switches (S22, BP, S11), 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 (S11). [10] Electrical installation (102) according to claim 9, in which the control device (108) is designed to, between the command (1002-2) for opening the junction switch (BP) and the command (1002-4) for opening the second downstream switch (S22) and / or between the command (1002-4) for opening the second downstream switch (S22) and the command (1002-6) for opening the first upstream switch (S11), check whether the midpoints (P1, 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, S11), to simultaneously control the opening of all the closed switches (S22, BP, S11). [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 (SC1, SC2) and a first and second network (LV1, LV2), the first network (LV1) comprising a battery (BAT), the interconnection device (IT) comprising: first upstream (S11) and downstream (S12) switches connected to each other at a first midpoint (P1), the first upstream switch (S11) being connected between the first direct voltage source (SC1) and the first downstream switch (S12), the first downstream switch (S12) being connected between the first upstream switch (S11) 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 (P1) 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 upstream switches (S11, S21) is open, the other switches (S11, S21, S12, BP, S22) being closed so that the direct voltage source (SC1, SC2) connected to the closed upstream switch (S11, 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 (S12) 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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