System for determining whether current is flowing through at least two sections of two DC lines

Abstract

The present application discloses a system for judging whether current is flowing through at least two sections of two DC lines. The system comprises a device (4) for judging whether current is flowing through a section of the DC line, the device (4) comprising: a current generator (5) adapted to deliver an alternating current to the section to be judged; a first electrical terminal (A) and a second electrical terminal (B); and a calculation module, the system also comprises a circuit comprising a first subcircuit (10) and a second subcircuit (11) having impedances, the impedances of the subcircuits (10, 11) having different values ​​from the device (4), and the calculation or electronic module is adapted to evaluate the impedance of delivering the alternating current to the first section and the second section.

Description

Technical Field

[0001] The present invention relates to a system for determining whether current is flowing through at least two sections of two DC lines. More specifically, the system relates to determining whether current is flowing through a switching device. Background Art

[0002] The section of the DC line to be determined can be, for example, a switching device, a fuse or a contactor of a lamp.

[0003] Switching devices are used to switch power circuits. Switching devices can be designed to be directly connected to high current load devices, for example, to control a motor in an electric or hybrid vehicle.

[0004] The switchgear has multiple components with contactors as the current carrying part. The switchgear can be single pole, two pole, three pole or even multi pole, each pole having its associated contactor or current carrying element.

[0005] In some applications, it may be sufficient to switch a circuit acting on one of the poles on and off. But for other applications and for safety reasons, it is necessary to disconnect more than one pole or even all poles. This is the case with batteries for electric and hybrid vehicles.

[0006] In the prior art, if the states of a plurality of contactors are to be determined in a switch device, a plurality of devices for determining the state of a single contactor must be included.

[0007] Devices for determining the condition of a line section are known in the art. Such devices may, for example, comprise a circuit with a voltage-dividing resistor intended for potential measurement.

[0008] In the case of high voltage circuits, this must be achieved by the following items: multiple resistors are arranged in series to adjust the measurement range, isolation circuits are used to separate the high voltage potential of the control circuit (contactor measurement result) by using DC / DC converters and isolation buffers, and switches that open the measuring resistor chain to avoid continuous current extraction. Therefore, these devices are based on measuring the potential on both sides of the section of the DC line to be judged.

[0009] It is also known to use a device for determining the condition of a contactor or fuse, the device comprising:

[0010] a current generator adapted to deliver an alternating current through the contactor or fuse to be determined,

[0011] A calculation or electronic module that verifies that the delivered current is flowing through the contactor or fuse.

[0012] More specifically, a device is known that includes a transformer that injects a voltage or current into a contactor in parallel to judge. The current to the secondary and primary of the transformer is analyzed, and if the current can flow through the primary and secondary of the transformer, the contactor is judged to be closed. If the current cannot flow, the contactor is open.

[0013] For the above situation, a complete system including a transformer, a drive and a detection is used for each of the contactors to be judged in the switchgear. Summary of the invention

[0014] An object of the present invention is a system for determining whether current is flowing through at least two sections of two direct current (DC) lines.

[0015] The section of the DC line to be determined can be, for example, a switching device, a fuse or a contactor of a lamp.

[0016] Therefore, more specifically, the object of the present invention is also a system for determining whether at least two contactors in a switching device of two direct current (DC) lines are flowing current.

[0017] One or more switchgears to be determined by the system of the present invention are of the type of at least two sections including two DC lines. For example, the switchgear may have a first pole and a second pole, so two sections may be determined. As mentioned above, in an embodiment, the two sections may be two contactors.

[0018] The system of the present invention aims to be able to determine whether current is flowing through at least two sections of two direct current (DC) lines. The system includes a device for determining whether current is flowing through the section, and the device is of the type including the following items:

[0019] a current generator adapted to deliver an alternating current (AC) to the segment to be determined, and

[0020] A computing or electronic module for verifying whether the delivered current flows through the segment.

[0021] The system objectives of the present invention also include:

[0022] A circuit, the circuit comprising at least a first subcircuit and a second subcircuit:

[0023] The first subcircuit comprises the device, the first subcircuit being adapted to connect a first section of a first direct current (DC) line to be determined in parallel with the device, and

[0024] The second subcircuit comprises the device, the second subcircuit being adapted to connect a second section of a second direct current (DC) line to be determined in parallel with the device, and

[0025] The two sub-circuits are electrically connected, and the system further comprises:

[0026] A unit for allowing the delivered alternating current (AC) to circulate through the various sub-circuits,

[0027] Means for preventing direct current (DC) from circulating between the two sub-circuits and towards the device.

[0028] The arrangement, the first subcircuit and the second subcircuit are therefore configured to separate the potential between the first section and the second section and to decouple the delivered current from the potentials of the first section and the second section.

[0029] The first and second subcircuits have impedances. The impedances of the subcircuits of each have different values ​​as seen from the device, and the calculation or electronic module is adapted to evaluate the impedance of delivering an alternating current (AC) to the first and second segments.

[0030] The delivered AC current can flow to the first section through the first subcircuit and its associated impedance, and can flow to the second section through the second subcircuit and its associated impedance. Since the impedance of the first subcircuit is different from the impedance of the second subcircuit, the impedance of the loop of the first subcircuit is different from the impedance of the loop of the second subcircuit.

[0031] Thus, the calculation or electronic module can identify the state of at least the first and second segments because the impedance of the delivered current is different depending on the state of the segment. In the case where the segments are contactors, the impedance is different depending on whether the contactor is open or closed.

[0032] As described above, the impedance of each of the subcircuits has a different value when viewed from the device. This means that the impedance value of each subcircuit is determined when no current flows to the other subcircuits. In the case of a contactor, when the impedance of a subcircuit is determined, the contactors of the other subcircuits are in an open state.

[0033] The system object of the present invention has the advantage that only one circuit detector is used to evaluate the status of more than one segment.

[0034] Another object of the present invention is a system for an electric vehicle, characterized in that the system comprises:

[0035] A battery, the battery comprising a positive electrode and a negative electrode,

[0036] a switch including two contactors connected to the positive electrode and the negative electrode of the battery, and

[0037] According to the system for determining whether current is flowing through the two contactors according to any one of the preceding aspects, the first subcircuit is connected to the first contactor, and the second subcircuit is connected to the second contactor. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to complete the description and for a better understanding of the present invention, the accompanying drawings are provided. The accompanying drawings constitute an integral part of the description and illustrate preferred embodiments of the present invention. The accompanying drawings include the following figures.

[0039] Figure 1 A circuit diagram of an embodiment of three single-pole switching devices and a system for determining the condition of contactors in the switching devices is shown.

[0040] Figure 2 A circuit diagram of a second embodiment of three single-pole switching devices and a system for determining the condition of contactors in the switching devices is shown.

[0041] Figure 3 A circuit diagram of a third embodiment of three single-pole switching devices and a system for determining a condition of a contactor in the switching devices is shown.

[0042] Figure 4 A circuit diagram of a fourth embodiment of three single-pole switching devices and a system for determining a condition of a contactor in the switching devices is shown.

[0043] Figure 5 A circuit diagram showing an embodiment of an apparatus for determining whether a segment is flowing current.

[0044] Figure 6 A circuit diagram showing a second embodiment of a device for determining whether a segment is flowing current.

[0045] Figure 7 A circuit diagram showing a third embodiment of a device for determining whether a segment is flowing current. DETAILED DESCRIPTION

[0046] Figure 1 Two embodiments of single-pole switches are shown, which have two current lines 20 , 21 and a first contactor 1 and a second contactor 2 , each of which is located in each DC line 20 , 21 .

[0047] Furthermore, the embodiment shown comprises an additional single-pole switch, the additional contactor 3 of which is intended for precharging the power supply system.

[0048] The illustrated embodiment of the system includes:

[0049] Device 4 or detector for determining the condition of the first contactor 1 and the second contactor 2 and optionally for determining the condition of the additional contactor 3. Instead of contactors 1, 2, 3, fuses or lamps or any other section of the DC line 20, 21 can be determined by the device 4 according to the invention.

[0050] The device 4 comprises:

[0051] Current generator 5, such as Figures 5 to 7 As depicted in the illustrated embodiment. The current generator 5 is adapted to deliver an alternating current (AC) through at least the first contactor 1, the second contactor 2 or the third contactor 3 to be determined;

[0052] A computing or electronic module for verifying whether the delivered current flows through the first contactor 1 , the second contactor 2 and / or the third contactor 3 .

[0053] The computing or electronic module serves the purpose of verifying whether the generated current flows through the contactors 1 , 2 , 3 and thus determining which of the contactors 1 , 2 , 3 is in the on state or in the off state.

[0054] The computing or electronic module may include one or more of an electronic module, a computing module, and a logic gate module.

[0055] Figure 1 The system shown comprises a circuit including a first subcircuit 10 and a second subcircuit 11. The second subcircuit 11 and the first subcircuit 10 are connected.

[0056] The first subcircuit 10 is adapted to connect the first contactor 1 in parallel with the device 4 to determine the condition of the contactor 1. The second subcircuit 11 is adapted to connect the second contactor 2 in parallel with the device 4 to determine the condition of the contactor 2.

[0057] Furthermore, in the embodiment shown, the first subcircuit 10 comprises a first impedance Z1 and the second subcircuit 11 comprises a second impedance Z2. The value of Z1 is different from that of Z2, ie the absolute values ​​of the two impedances Z1, Z2 are different.

[0058] The first impedance Z1 is adapted to be connected in series with the first contactor 1 or the first section and with the device 4 to determine the condition of the first contactor 1 and the additional contactor 3. Alternatively or additionally, the second impedance Z2 is adapted to be connected in series with the second contactor 2 or the second section and with the device 4 to determine the condition of the second contactor 2. The first impedance Z1 and the second impedance Z2 may be inherent impedances of the circuit as seen by the device 4.

[0059] According to the above, the current generator 5 is adapted to deliver an alternating current (AC) flowing through the first subcircuit 10 and through the second subcircuit 11. The delivered alternating current (AC) is adapted to flow through the first section, i.e., the first contactor 1 in the embodiment shown, and return to the device 4. The delivered alternating current (AC) is also adapted to flow through the second section, i.e., the second contactor 2, and return to the device 4.

[0060] Furthermore, the device 4 for determining whether a current is flowing through the segment comprises a first electrical terminal A and a second electrical terminal B. In addition, the first subcircuit 10 and the second subcircuit 11 are both connected to each other and are connected to the two electrical terminals A, B in common.

[0061] The claimed system further comprises:

[0062] means for allowing the delivered alternating current (AC) to circulate through the various sub-circuits 10, 11, and

[0063] A unit for preventing a direct current (DC) from circulating between the two sub-circuits 10, 11 and toward the device 4 for determining whether a current flows.

[0064] Specifically, the unit for allowing the delivered alternating current (AC) to circulate through the respective sub-circuits 10, 11 and the unit for preventing the direct current (DC) from circulating between the two sub-circuits 10, 11 and toward the device 4 for determining whether current flows can be capacitors C1b, C1a, C2b, C2a.

[0065] In order to achieve the above-mentioned effective isolation, at a minimum, the system includes at least capacitors C1b, C1a, C2b, C2a, which are located in each electrical connection of the two DC lines 20, 21, and in each electrical connection between the device 4 for determining whether current is flowing through the section and each section or contactor 1, 2, 3.

[0066] exist Figure 1 In the embodiment shown, the first subcircuit 10 and the second subcircuit 11 include capacitors C1b, C1a, C2b, C2a, respectively. The capacitors C1b, C1a, C2b, C2a separate the DC lines 20, 21 with a DC current and connect the DC lines 20, 21 with an AC current provided by the current generator 5.

[0067] More specifically, Figure 1 The disclosed system in the embodiment includes:

[0068] a first capacitor C1b connected in series with the first contactor 1 and with the first electrical terminal A of the device 4,

[0069] a second capacitor C2b connected in series with the first contactor 1 and with the second electrical terminal B of the device 4, so that, seen from the device 4, the second capacitor C2b is also connected in series with the first capacitor C1b,

[0070] a third capacitor C1a connected in series with the second contactor 2 and with the first electrical terminal A of the device 4, so that, seen from the device 4, the third capacitor C1a is also connected in parallel with the first capacitor C1b,

[0071] A fourth capacitor C2a is connected in series with the second contactor 2 and with the second electrical terminal B of the device 4 and is therefore also connected in series with the third capacitor C1a as seen from the device 4 and is also connected in parallel with the second capacitor C2b as seen from the device 4 .

[0072] Therefore, for the first sub-circuit 10, Figure 1 The circuit of the embodiment of has an equivalent impedance of the impedance of the first capacitor C1b and the second capacitor C2b plus the impedance of the impedance Z1, all of which are arranged in series from the perspective of the device 4. Similarly, for the second subcircuit 11, the circuit has an equivalent impedance of the impedance of the third capacitor C1a and the fourth capacitor C2a plus the impedance of the impedance Z2, all of which are arranged in series from the perspective of the device 4. And, therefore, the device 4 will see the final equivalent impedance from the equivalent impedance of the first subcircuit 10 and the equivalent impedance of the second subcircuit 11, and from the perspective of the device 4 for determining whether current is flowing through both contactors 1, 2, the equivalent impedance of the first subcircuit 10 and the equivalent impedance of the second subcircuit 11 are arranged in parallel.

[0073] The capacitors C1b, C1a, C2b, C2a thus allow decoupling between the two DC lines 20, 21 and between the contactors 1, 2 and the device 4 for determining the condition of the contactors 1, 2, in order to determine the condition of the contactors 1, 2. The capacitors C1b, C1a, C2b, C2a are able to isolate the device 4 from the busbar current lines 20, 21, since they only allow an alternating current to flow from the device 4 to the contactors 1, 2.

[0074] Figures 5 to 7 Different embodiments of a device 4 for determining the condition of contactors 1, 2, 3 are shown. The device 4 shown comprises:

[0075] a current generator 5 adapted to deliver an alternating current through the segment or contactor 1, 2, 3 to be determined, a first electrical terminal A and a second electrical terminal B, and

[0076] A computing or electronic module that verifies whether the delivered current flows through the contactors 1 , 2 , 3 .

[0077] More specifically, the device 4 shown also includes:

[0078] The first submodule comprises the primary side of a transformer T1 and an alternating current generator 5 arranged in series,

[0079] a second submodule, which is connected in parallel with the first submodule and comprises a secondary side of the transformer T1 and a first electrical terminal A and a second electrical terminal B, the first electrical terminal A and the second electrical terminal B being arranged in series with the secondary side of the transformer T1, and

[0080] The third submodule comprises a microcontroller (not shown) adapted to receive the output signal Vout from the transformer T1 .

[0081] Transformer T1 can be configured as:

[0082] The potential separation between contactors 1 and 2 to be determined, and

[0083] The potential between the contactors 1, 2 to be determined and the computing or electronic module is isolated.

[0084] In the embodiment shown, the alternating current generator 5 comprises a direct voltage source and two transistors Q1 , Q2 which convert the direct current into an alternating current.

[0085] Therefore, a set of transistors Q1 , Q2 is provided in the first submodule to convert the direct current generated by the current generator 5 into an alternating current.

[0086] According to an embodiment, the current generator 5 is arranged such that the current supply reflected at the primary side of the transformer T1 is appropriately isolated from the current supply lines 20 , 21 .

[0087] In addition, the second submodule of the device 4 may also include a unit adapted to decouple the potentials associated with the first contactor 1 and the second contactor 1 to be determined from the device 4 .

[0088] These units may also include a plurality of capacitors C1, C2. Figure 6 In the embodiment, capacitors C1 , C2 are arranged in the secondary winding of transformer T1 , specifically between transformer T1 and electrical terminals A, B. Capacitors C1 , C2 allow a decoupling between the generated current and possible potentials in contactors 1 , 2 , 3 to be determined. Figure 7 Only one capacitor C2 is disclosed.

[0089] Since the system itself can include a set of capacitors C1b, C1a, C2b, C2a in the first subcircuit 10 and the second subcircuit 11, the above-mentioned capacitors C1, C2 of the device 4 can be omitted, because the functions of the capacitors C1, C2 are already performed by the capacitors C1b, C1a, C2b, C2a in the system. Alternatively, some of the capacitors C1b, C1a, C2b, C2a located in the subcircuits 10, 11 can be omitted.

[0090] Figure 3 The following embodiment is disclosed, in which the first subcircuit 10 comprises a first capacitor C1b adapted to be connected in series with the first contactor 1 and with the first electrical terminal A of the device 4, and a second capacitor C2b adapted to be connected in series with the first contactor 1 and with the second electrical terminal B of the device 4. Furthermore, the device 4 for determining whether a current is flowing through the section comprises a first capacitor C1 located between the transformer T1 and the first electrical terminal A, and a second capacitor C2 located between the transformer T1 and the second electrical terminal B.

[0091] Figure 2 Another embodiment is disclosed, in which the first subcircuit 10 comprises a first capacitor C1b adapted to be connected in series with the first contactor 1 and with the first electrical terminal A of the device 4, and the second subcircuit 11 comprises a second capacitor C2b adapted to be connected in series with the second contactor 2 and with the second electrical terminal B of the device 4. Furthermore, the device 4 for determining whether a current is flowing through the section comprises a first capacitor C1 between the transformer T1 and the first electrical terminal A and a second capacitor C2 between the transformer T1 and the second electrical terminal B.

[0092] Figure 4 A fourth embodiment or combination is disclosed. The first subcircuit 10 comprises a first capacitor C1b adapted to be connected in series with the first contactor 1 and with the first electrical terminal A of the device 4, a second capacitor C2b adapted to be connected in series with the first contactor 1 and with the second electrical terminal B of the device 4, and the second subcircuit 11 comprises a third capacitor C1a adapted to be connected in series with the second contactor 2 and with the first electrical terminal A of the device 4. In addition, the device 4 is as Figure 7 The device 4 comprises a fourth capacitor C2 located between the transformer T1 and the second electrical terminal B.

[0093] exist Figure 3 and Figure 4 In the embodiment shown, the capacitors C1b and C2b in the first sub-circuit 10 are different from the capacitors in the second sub-circuit 11. Figure 3 The second subcircuit 11 of the embodiment has no capacitor. Figure 4In these embodiments, for the two subcircuits 10, 11, due to the different constructions of the capacitors, they already have different impedances in the capacitors themselves, so no additional impedance is needed in the subcircuits 10, 11 to distinguish from the device 4.

[0094] Figures 5 to 7 A device 4 for determining whether current flows is disclosed, which may also include a filter, other resistors Rout, R, and a capacitor C3, which are intended to adjust the output signal Vout sent by a forward calculation or electronic module (not shown) for verifying whether the delivered current flows through the contactors 1, 2, 3.

[0095] Figures 1 to 4 The system disclosed in the invention comprises an additional section, specifically a single-pole switch or contactor 3, which is connected in parallel with the first contactor 1 through a circuit 12. The circuit 12 comprises or includes an impedance Z3 seen from the device 4 for determining whether a current flows, which has a value different from the value of the impedance Z1 of the first subcircuit 10 and the value of the impedance Z2 of the second subcircuit 11. Specifically, the circuit 12 comprises an impedance Z3 connected in series with the additional contactor 3, and the impedance Z3 may be the inherent impedance of the circuit 12.

[0096] The additional contactor 3 may be associated with the pre-charging system. Initially, the additional contactor 3 is closed, while the first contactor 1 is open, and pre-charging of the power supply system is performed. Afterwards, the additional contactor 3 is open, while the first contactor 1 is closed.

[0097] Furthermore, the impedance Z1 of the first subcircuit 10 is connected in series with the impedance Z3 of the circuit 12 including the additional contactor 3 .

[0098] In an embodiment, the first impedance Z1 and the second impedance Z2 are between 10 kilo-ohms and 100 kilo-ohms, and the impedance Z3 of the circuit 12 of the additional contactor 3 is between 25 ohms and 200 ohms.

[0099] In an embodiment, the device 4 for determining the condition of the contactors 1 , 2 , 3 will evaluate the status of the contactors 1 , 2 , 3 as shown in the following table.

[0100]

[0101] The system is designed to first close the additional contactor 3 for precharging, and when the precharging of the power system is performed, close the first contactor 1. In the application of electric vehicles, not knowing whether the additional contactor 3 related to the precharging system is disconnected will not affect the function of the switchgear, because most of the current will flow through the first contactor 1 and not through the additional contactor 3. Later, when the first contactor 1 and the additional contactor 3 are closed, it can be known whether the additional contactor 3 has failed.

[0102] The computing or electronic module, in particular the microcontroller of the computing or electronic module, for verifying whether the delivered current flows through the section or contactor 1, 2, is adapted to store the value of at least the impedance or related tensor of the first subcircuit 10, the second subcircuit 11 and the first subcircuit 10 and the second subcircuit 11 connected in parallel. The computing or electronic module, in particular the microcontroller, is also adapted to receive an output tensor Vout related to the equivalent impedance between the electrical terminals A, B seen from the device 4, and is configured to compare the received tensor Vout with the stored value, which may be a table of impedance values ​​or a table of voltage values.

Claims

1. A system for determining the status of at least two sections of two DC lines (20, 21), the system comprising a device (4) for determining whether a current is flowing through the section of the DC line, the device (4) comprising: a current generator (5) adapted to deliver an alternating current to the segment to be determined, a first electrical terminal (A) and a second electrical terminal (B), and a computing or electronic module for verifying whether the delivered current flows through the segment, Characterized in that the system further comprises a circuit, wherein the circuit comprises at least a first subcircuit (10) and a second subcircuit (11): The first subcircuit (10) comprises the device (4), the first subcircuit (10) being adapted to connect a first section of a first DC line (20) to be determined in parallel with the first electrical terminal (A) and the second electrical terminal (B) of the device (4), and The second subcircuit (11) comprises the device (4), the second subcircuit (11) being adapted to connect the second section of the second DC line (21) to be determined in parallel with the first electrical terminal (A) and the second electrical terminal (B) of the device (4), The first sub-circuit (10) and the second sub-circuit (11) are both electrically connected, and the system further comprises: means for allowing the delivered alternating current to circulate through each of the first subcircuit (10) and the second subcircuit (11), and means for preventing a direct current from circulating between the first subcircuit (10) and the second subcircuit (11) and towards the device (4), The first subcircuit (10) and the second subcircuit (11) have impedances, the impedances of the first subcircuit (10) and the second subcircuit (11) having different values ​​as seen from the device (4), and the calculation or electronic module is adapted to evaluate the impedance of the alternating current delivered to the first segment and the second segment.

2. The system for determining the status of at least two sections of two DC lines (20, 21) according to claim 1, wherein: The current generator (5) is adapted to deliver an alternating current through the first subcircuit (10) and through the second subcircuit (11), the delivered alternating current being adapted to flow through a first section and return to the device (4), and through a second section and return to the device (4).

3. The system for determining the status of at least two sections of two DC lines (20, 21) according to claim 1 or 2, wherein: The first sub-circuit (10) and the second sub-circuit (11) are connected to each other and are commonly connected to both the first electrical terminal (A) and the second electrical terminal (B).

4. The system for determining the status of at least two sections of two DC lines (20, 21) according to claim 1, wherein: The first subcircuit (10) comprises a first impedance (Z1) adapted to be connected in series with the first section and with the device (4), and / or the second subcircuit (11) comprises a second impedance (Z2) having a different value than the first impedance (Z1) and adapted to be connected in series with the second section and with the device (4).

5. The system for determining the status of at least two sections of two DC lines (20, 21) according to claim 1, wherein: The means for allowing the delivered alternating current to circulate through each of the first subcircuit (10) and the second subcircuit (11) and the means for preventing direct current from circulating between the first subcircuit (10) and the second subcircuit (11) and towards the device (4) are capacitors (C1b, C1a, C2b, C2a).

6. The system for determining the status of at least two sections of two DC lines (20, 21) according to claim 5, wherein: The system comprises at least capacitors (C1b, C1a, C2b, C2a), which are located in each electrical connection between the two DC lines (20, 21) and in each electrical connection between the device (4) and each segment.

7. The system for determining the conditions of at least two sections of two DC lines (20, 21) according to claim 6, wherein: The system comprises a first capacitor (C1b) adapted to be connected in series with the first section and with the first electrical terminal (A) of the device (4), a second capacitor (C2b) adapted to be connected in series with the first section and with the second electrical terminal (B) of the device (4), a third capacitor (C1a) adapted to be connected in series with the second section and with the first electrical terminal (A) of the device (4), and a fourth capacitor (C2a) adapted to be connected in series with the second section and with the second electrical terminal (B) of the device (4).

8. The system for determining the status of at least two sections of two DC lines (20, 21) according to claim 1, wherein: The device (4) comprises: A first submodule, the first submodule comprising a primary side of a transformer (T1) and an alternating current generator (5) arranged in series, a second submodule, the second submodule being connected in parallel with the first submodule and comprising a secondary side of the transformer (T1) and the first electrical terminal (A) and the second electrical terminal (B), the first electrical terminal (A) and the second electrical terminal (B) being arranged in series with the secondary side of the transformer (T1), and A third submodule, the third submodule comprising a microcontroller adapted to receive an output signal (Vout) from the transformer (T1).

9. The system for determining the conditions of at least two sections of two DC lines (20, 21) according to claim 8, wherein: The device (4) comprises a fifth capacitor (C1) located between the transformer (T1) and the first electrical terminal (A) and a sixth capacitor (C2) located between the transformer (T1) and the second electrical terminal (B).

10. The system for determining the status of at least two sections of two DC lines (20, 21) according to claim 9, wherein: The first subcircuit (10) comprises a first capacitor (C1b) adapted to be connected in series with the first section and with the first electrical terminal (A) of the device (4), and a second capacitor (C2b) adapted to be connected in series with the first section and with the second electrical terminal (B) of the device (4).

11. The system for determining the status of at least two sections of two DC lines (20, 21) according to claim 9, wherein: The first subcircuit (10) comprises a first capacitor (C1b) adapted to be connected in series with the first section and with the first electrical terminal (A) of the device (4), and the second subcircuit (11) comprises a fourth capacitor (C2a) adapted to be connected in series with the second section and with the second electrical terminal (B) of the device (4).

12. The system for determining the status of at least two sections of two DC lines (20, 21) according to claim 1, wherein: The two DC lines (20, 21) comprise an additional section connected in parallel with the first subcircuit (10) via a circuit (12) comprising an impedance (Z3) seen from the device (4), wherein the impedance of the first subcircuit (10) and the second subcircuit (11) have a different value than the impedance (Z3) of the circuit (12) of the additional section.

13. The system for determining the status of at least two sections of two DC lines (20, 21) according to claim 1, wherein: The computing or electronic module for verifying whether the delivered current flows through the segment is adapted to: storing the value of at least the impedance or a tensor related thereto of the first subcircuit (10), the second subcircuit (11), and the first subcircuit (10) and the second subcircuit (11) connected in parallel, receiving an output tensor (Vout) associated with an equivalent impedance between the first electrical terminal (A) and the second electrical terminal (B) as seen by the device (4), and Compare the received tensor (Vout) with the stored value.

14. The system for determining the status of at least two sections of two DC lines (20, 21) according to claim 1, wherein: The two sections of the two DC lines (20, 21) are a first contactor (1) and a second contactor (2).

15. A system for an electric vehicle, the system comprising: A battery, the battery comprising a positive electrode and a negative electrode, A switch comprising two contactors (1, 2) connected to the positive electrode and the negative electrode of the battery, and According to the system for determining the conditions of at least two sections of two DC lines (20, 21) according to any one of claims 1 to 14, the first subcircuit (10) is connected to a first contactor (1), and the second subcircuit (11) is connected to a second contactor (2).

Images