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 device (100), comprising: a first and a second DC voltage source; a first network (LV1) including 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, in response to the detection of an undervoltage in the interconnection device (IT), to open the downstream switch (S12) connected to the first network (LV1) to place the interconnection device (IT) in a so-called safe configuration. Figure for the abstract: Fig. 2

Description

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

[0001] The present invention relates to an electrical installation with two DC 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 car, a motorcycle, a motorized bicycle, or a motorized wheelchair.

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

[0004] An electrical installation comprising first and second DC voltage sources, as well as two networks supplied independently by one of the DC voltage sources respectively, is known from the prior 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 cease to function.

[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 for a mobility device is therefore proposed, comprising: - a first source of direct current voltage; - a second source of direct current voltage; - a first network comprising a battery; - a second network; characterized in that it comprises: - an interconnection device comprising: • the 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 input 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; 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 both networks to supply them electrically: • in response to the 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 supplies power to 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 initially faulty DC voltage source 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 allows it to be isolated to preserve the power supply to the other network, or the network is not faulty and is therefore not the cause of the detected undervoltage, and opening the switch allows it to be isolated so that its battery can supply power to the equipment (loads) present on this network.

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

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

[0011] Optionally also, the junction switch includes two unidirectional switches, each having an intrinsic diode or one added in parallel, the two unidirectional switches being mounted in series, with either each of the diodes conducting towards the other, or each of the diodes blocking towards the other.

[0012] Optionally, also, with the interconnection device 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 a detection that one of the DC voltage sources is failing, command the opening of the upstream switch connected to the failing DC voltage source to place the interconnection device in the fallback configuration.

[0013] Optionally, the control device is also designed, while the interconnection device is in its fallback configuration, to: check if the midpoints are undervolted, that is, if their voltages are below a predefined threshold; then If at least one of the midpoints is undervoltage, command the opening of the junction switch to put the interconnection device into a so-called degraded configuration.

[0014] Optionally, the control device is also designed, while the interconnection device is in a degraded configuration, to: check if the second midpoint is undervolted; then If the second midpoint is undervolted, command the opening of all closed switches.

[0015] Optionally, the electrical installation also includes a second downstream switch connected between the second midpoint and the second network.

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

[0017] Optionally also, with the interconnection device in the fallback configuration with the second upstream switch open, the control device is designed, if at least one of the midpoints is under-voltage, to control the opening of all closed switches.

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

[0019] Optionally, the control device is also designed to, between the between the opening command of the junction switch and the opening command of the second downstream switch and / or between the opening command of the second downstream switch and the opening command of the first upstream switch, check if the midpoints are undervoltage and record the result.

[0020] Optionally also, the control device is designed to control the opening of all closed switches, to simultaneously control the opening of all closed switches.

[0021] Optionally, the second network is also battery-free.

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

[0023] A method for controlling an interconnection device located between first and second DC voltage sources and first and second networks is also proposed, the first network comprising a battery, the interconnection device comprising: - the 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 process 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 both networks to supply them electrically: - in response to the 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] Also proposed is a computer program downloadable from a communication network and / or recorded on a computer-readable medium, characterized in that it includes instructions for the execution of the steps of a process 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 made with reference to the accompanying drawings in which: - [Fig. 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, - [Fig.3] is a block diagram of a first method for controlling the interconnection device, - Figure 4 illustrates an interconnection device configuration at one of the stages of the first control process. - Figure [5] illustrates an interconnection device configuration at one of the stages of the first control process, - Figure [6] illustrates an interconnection device configuration at one of the stages of the first control process, - Figure [7] illustrates an interconnection device configuration at one of the stages of the first control process, - Figure [8] illustrates an interconnection device configuration at one of the stages of the first control process, - Figure [9] illustrates an interconnection device configuration at one of the stages of the first control process, - Figure 10 is a block diagram of a second method for controlling the interconnection device, - Figure 11 illustrates an interconnection device configuration at one of the stages of the second control process, - Figure 12 illustrates an interconnection device configuration at one of the stages of the second control process, - Figure 13 illustrates an interconnection device configuration at one of the stages of the second control process, - Figure 14 illustrates an interconnection device configuration at one of the stages of the second control process, - Figure 15 illustrates an interconnection device configuration at one of the stages of the second control process, 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. 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.

[0027] The mobility device 100 includes an electrical installation 102 comprising first and second DC voltage sources, hereafter referred to as sources SCI and SC2, designed to respectively provide DC voltages VB1, VB2.

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

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

[0030] For example, BATI, BAT2 batteries comprise cells or accumulators in series. For example, the cells of BATI, BAT2 batteries are lithium-ion cells, lithium iron phosphate cells (LFP cells), or lithium nickel manganese cobalt cells (NMC cells). For example, BATI, BAT2 batteries have the same number N of cells or accumulators in series. Alternatively, BATI, BAT2 batteries may have 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 of 800V.

[0032] In other embodiments, the two sources SCI, SC2 may share a single battery supplying a DC voltage. In this case, the two DCDC1, DCDC2 converters are connected to this shared battery to receive the DC voltage supplied by it.

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

[0034] Furthermore, the electrical installation 102 also includes a first network LV1 designed to be electrically supplied by a direct current voltage VI, and a second network LV2 designed to be supplied by a direct current voltage V2. The voltages VI and V2 of the networks LV1 and LV2 are, for example, low voltages. Also, for example, the voltages VI and V2 are equal.

[0035] The first LV 1 network comprises a BAT battery and Zl loads, while the The second LV2 network is preferably battery-free, but includes Z2 loads.

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

[0037] When it is stated that the second LV2 network is battery-free, this means at a minimum that it is battery-free, meaning that it is not equipped with a battery designed to power the Z2 loads of the LV2 network and / or capable of storing a sufficient amount of electrical energy to deliver 1 kW for two minutes. Thus, the LV2 network may include electrical components that are therefore not batteries within the meaning of the present invention.

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

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

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

[0041] The IT interconnection device first includes a first link between the first source SCI and the first network LV1. This first link includes 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 IT interconnection device further includes a second link between the second source SC2 and the second network LV2. This second link includes a second upstream switch S21 connected between the second source SC2 and the second network LV2.

[0043] The IT interconnection device further includes a junction switch BP connected between the first and second links, and more specifically 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 include, 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 switch S21 and the second downstream switch 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, when open, to interrupt the current in only one direction, but not in the other. More precisely, each upstream switch SU, S12 is 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 SI 1, S12, S21, S22 is a semiconductor switch, such as a transistor, for example a metal-oxide-gate field-effect transistor (MOSFET), a silicon metal-oxide-gate field-effect transistor (SiMOSFET), a silicon carbide metal-oxide-gate field-effect transistor (SiCMOSFET), an insulated-gate bipolar transistor (IGBT), or a gallium nitride field-effect transistor (IGBT). Gallium Nitride Field Effect Transistor, also known as(the acronym GaN FET). The semiconductor switches used generally have an intrinsic diode or a parallel diode. In this case, the diode conducts towards the respective midpoint PI, P2 (cathode connected to the respective midpoint PI, P2).

[0047] The junction switch BP is preferably a bidirectional switch designed to interrupt current in both directions when open. The junction switch BP comprises, for example, two unidirectional switches BPI, BP2 arranged back-to-back in series, with, for example, an inductance L between them. Indeed, if a fault occurs on one of the two connections, the presence of the inductance L can slow the propagation of this fault to the other connection. This inductance L can be omitted, so that the unidirectional switches BPI, BP2 are directly connected to each other. Switch BPI is connected to the midpoint P1, while 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 one added in parallel.In this case, the diodes are reverse-biased, that is, either each conducting towards the other (cathodes connected to each other), or each blocking towards the other (anodes connected to each other, as in the illustrated example).

[0048] The electrical installation further includes a control device 108 for the IT interconnection device.

[0049] To control the IT interconnection device, 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 DCDC1, DCDC2 converter, and, on the other hand, an undervoltage appearing in the IT interconnection device.

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

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

[0052] 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 detected, for example, when the voltage in question rises above a predefined threshold, for example the same as for undervoltage detection.

[0053] Similarly, an overcurrent is detected, for example, when the current in question 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 that will be described later.

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

[0056] With reference to [Fig. 4], during step 302, the IT interconnection device 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 supplies power to the first network LV1 and the second source SC2 supplies power to the second network LV2, of separately.

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

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

[0059] During a step 308, the control device 108 detects an undervoltage in the IT interconnection device, 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 undervoltage, the control device 108 commands, 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 safe configuration. Generally, in this safe 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 equipped 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 ground GND2, the opening of the downstream switch S12 isolates the network LV1 to preserve the power supply to the network LV2.Furthermore, if the LV1 network is not faulty and therefore not the cause of the detected undervoltage, the BAT battery supplies power to the Zl loads, so the LV1 network remains functional. Therefore, first triggering the opening of the downstream switch S12, even without knowing the origin of the fault, is advantageous.

[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 undervolted, this means that the fault originated in the LV1 network and that opening the downstream switch S12 isolated this fault. The control device 108 then leaves the IT interconnection device in the fallback configuration, as illustrated in [Fig. 6], during a step 314. This fallback configuration is left, for example, for several minutes, by example until the next stop of the motor vehicle or until the electrical installation is repaired 102.

[0063] Conversely, with reference to [Fig. 7], if at least one of the midpoints PI, P2 is undervolted, 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 put the interconnection device IT into a so-called degraded configuration. This opening aims to try to save the power supply to the LV2 network from the source SC2, if the upstream switch SI1 is faulty, or, when the downstream switch S12 is unidirectional, to prevent 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 if the second midpoint P2 is undervoltage.

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

[0066] On the other hand, if the second midpoint P2 is undervolted, 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 that are still closed, i.e. the switches SI 1, S22, to put the interconnection device IT into a so-called shutdown configuration (all 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 performed. Instead, the source SC2 is preferably deactivated, for example by deactivating the second DCDC converter 2.

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

[0070] With reference to [Fig.9], during a step 322-6, the control device 108 commands 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 [Figs. 10] to 15, a method 1000 for operating the control device 108 will now be described, in the case where the second source SC2 is faulty. The steps common to 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 commands, during step 306, the opening of the upstream switch S21 connected to the faulty source SC2 to place the IT interconnection device in the fallback configuration.

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

[0075] With reference to [Fig. 12], in response to the detection of the undervoltage, the control device 108 commands, during step 310, the opening of the downstream switch S12 connected to the first network LV1 to place the IT interconnection device 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 commands, during a step 1002, the opening of all the switches which are always 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 for in method 300, i.e.: step 1002-2 of opening command of the junction switch BP ([Fig. 14]), then step 1002-4 of opening command of the second downstream switch S22, if present ([Fig. 13]), then step 1002-6 of opening command 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 undervolted and records the result in memory. This information is useful for maintenance, in order to identify the source of the failure.

[0081] Preferably also, during a step 1002-5 between steps 1002-4 and 1002-6, the control device 108 checks whether the first midpoint PI is undervolted and records the result in 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 SCI source is preferably deactivated, for example by deactivating the first DCDC1 converter.

[0083] Thus, as can be seen, the complete opening / closing sequence of the switches from the normal configuration to the shutdown configuration is similar regardless of the faulty SCI or SC2 source: opening of the upstream switch SU or S21 connected to the faulty SCI or SC2 source 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 SU or S21 connected to the still valid SCI or SC2 source. Having the same switch control algorithm regardless of the faulty source simplifies certification.

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

[0085] Furthermore, in order to be able to identify the origin of the failure later, the control device 108 can be designed to check if the midpoints PI, P2 are undervolted 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 previously stated, the second downstream switch S22 can be omitted, particularly when the LV2 network is battery-free. Indeed, the downstream switch SI1 is designed to prevent uncontrolled charging of the battery BAT if the source SCI, SC2 supplying the LV1 network were to begin supplying current uncontrollably. However, since the LV2 network is battery-free, this risk is nonexistent for the LV2 network, so the downstream switch S22 is not essential.

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

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

[0089] In the detailed presentation of the invention given above, the terms used shall not be interpreted as limiting the invention to the embodiments set forth in this description, but shall be interpreted as including all equivalents which are foreseeable by a person skilled in the art by applying their general knowledge to the implementation of the teaching that has just been given. to be disclosed to him.

Claims

Demands

1. Electrical installation (102) for a mobility device (100), comprising: - a first source of direct current voltage (DCS); - a second DC voltage source (SC2); - a first network (LV1) including a battery (BAT); - a second network (LV2); characterized in that it comprises: - an interconnection (IT) device comprising: • the 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 DC 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 DC 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 to, with the interconnection device (IT) 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 DC voltage source (SCI, SC2) connected to the closed upstream switch (SI1, S21) is connected to both networks (LV1, LV2) to supply them electrically: • in response to the 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 fallback configuration

2.

3.

4.

5. refuge. Electrical installation (102) according to claim 1, wherein 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 conducting diodes in the direction of the other, or each of the blocking diodes in the direction of the other. Electrical installation (102) according to claim 1 or 2, wherein, 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) are closed, the control device (108) is designed to: - in response to a 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, wherein the control device (108) is designed, while the interconnection device (IT) is in its fallback configuration, for: - check (312) if the midpoints (PI, P2) are undervolted, that is, if they have voltages below 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 put the interconnection device (IT) into a so-called degraded configuration. Electrical installation (102) according to claim 4, wherein the control device (108) is designed, while the interconnection device (IT) is in a degraded configuration, for: check (318) if the second midpoint (P2) is undervolted; then - if the second midpoint (P2) is undervoltage, command (322) the opening of all 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, wherein the control device (108) is designed to control (322) the opening of all 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 under-voltage 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, wherein, 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 under-voltage, 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 to control (1002) the opening of all 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 designed 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) the opening of the first upstream switch (SI 1), check if the midpoints (PI, P2) are under-voltage 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 closed switches (S22, BP, SU), to simultaneously control the opening of all closed switches (S22, BP, SU).

12. Electrical installation (102) according to any one of claims 1 to 11, wherein the second network (LV2) is battery-free.

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

14. Method (300; 1000) of controlling an interconnection device (IT) located between first and second DC voltage sources (SCI, SC2) and first and second networks (LV1, LV2), the first network (LV1) having a battery (BAT), the interconnection device (IT) having: - first upstream (SI1) and downstream (S12) switches connected to each other at a first midpoint (PI), the first upstream switch (SI1) being connected between the first DC voltage source (SCI) and the first downstream switch (S12), the first downstream switch (S12) being connected between the first upstream switch (SI1) and the first network (LV1), - a second upstream switch (S21) connected between the second DC 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-, The upstream circuit breaker (SU, S21) is open, the other switches (SU, S21, S12, BP, S22) are closed so that the DC voltage source (SCI, SC2) connected to the closed upstream switch (SU, S21) is connected to both networks (LV1, LV2) to supply them electrically: - in response to a 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. A computer program downloadable from a communication network and / or stored on a computer-readable medium, characterized in that it includes instructions for carrying out the steps of a process according to claim 14, when said program is executed on a computer.