Printed circuit board device enabling the measurement of at least one electrical quantity

Abstract

Printed circuit board device for measuring at least one electrical quantity The present invention relates to a printed circuit board device for measuring at least one electrical quantity, said device comprising a printed circuit board (1), referred to as motherboard (1), having a face, referred to as main face (1a), a measuring device for measuring at least one electrical quantity and for generating measurement signals and at least one current-conducting track (3) for measurement.It is characterized in that it further comprises an additional printed circuit board, called daughterboard (2), having two opposite faces and being connected directly to the main face (1a) of the motherboard (1) by being held substantially perpendicular to the motherboard (1), in that the conductive track or each conductive track (3) comprises a main part (30, 30') extending over the main face (1a) of the motherboard (1) and a transition part extending over the two faces (20, 20') of the daughterboard (2) by passing through it, the main part (30, 30') comprising two main segments (30, 30') on either side of the daughterboard (2), each connected, by a conductive link (8), to the transition part of said conductive track (3) and in that the measuring device is implanted on the daughterboard (2) by being connected to the or one of the conductive transition parts. Figure to be published with the abbreviation: Fig.1.

Description

Title of the invention: Printed circuit board device for measuring at least one electrical quantity

[0001] The present invention relates to the field of printed circuit boards, more particularly to printed circuit boards used in residential and commercial electrical equipment and in vehicle power supply. Its object is a printed circuit board device enabling the measurement of at least one electrical quantity.

[0002] In the present application, "printed circuit" means any type of physical circuit structure comprising an insulating substrate (or insulating support or base) and at least one electrically conductive layer permanently fixed on and / or in the insulating substrate.

[0003] In such a printed circuit board, also called an electronic board, the conductive layers form conductive tracks (or conductive paths) for the electric current, allowing the connection of electronic or electrical components held on the surface of the insulating substrate or between two conductive layers. The connection of the surface components is generally achieved by a permanent assembly process called soldering, which establishes, using a filler metal, a metallic bond between the component and the conductive track, resulting in a solder joint. The printed circuit board is then generally coated with a protective layer such as a varnish, protecting the conductive tracks, and is produced by mechanical and / or chemical treatment of a conductive sheet, paste, or film onto an insulating substrate.

[0004] Printed circuit boards, called motherboards, are also known to be connected to another printed circuit board, called a daughterboard. The connection between the two boards, the motherboard and the daughterboard, is generally made using connectors with electrical contacts that allow the motherboard to be electrically connected to the daughterboard.

[0005] It is known that in the field of electrical equipment in residential, commercial, or industrial buildings, or at sites such as those dedicated to electric vehicle charging, this equipment increasingly uses electronic boards for its operation. This is particularly true in the field of electric vehicle charging (for example, charging stations), which use electronic boards for power and / or charging control. This is also the case for new-generation electricity meters, which use electronic boards.

[0006] These electronic boards generally include measurement circuits for measuring electrical / physical quantities / parameters such as current, voltage, or power. However, these measurement circuits, particularly those based on toroidal cores, occupy a significant amount of space on the electronic board, especially when the boards are subjected to high currents (for example, between 16A and 32A), as is the case for electronic boards used in electric vehicle charging or electricity meters. Furthermore, these measurement circuits frequently cause overheating problems, particularly in the presence of such high currents, which can damage the surrounding components of the electronic board.

[0007] The present invention aims to overcome these drawbacks.

[0008] To this end, the present invention relates to a printed circuit board device for measuring at least one electrical quantity, said device comprising a printed circuit board, referred to as the motherboard, having one face, referred to as the main face, a measuring device for measuring at least one electrical quantity and for generating measurement signals and at least one current-conducting trace for the measurement, characterized in that it further comprises an additional printed circuit board, referred to as the daughterboard, having two opposite faces, namely a first face and a second face and being connected directly to the main face of the motherboard while being held substantially perpendicular to the motherboard, in that the conductive trace or traces comprise a main portion extending over the main face of the motherboard and a transition portion extending over both faces of the daughterboard, passing through it.the main part comprising two main segments on either side of the daughterboard, namely a first main segment and a second main segment, each connected, by a conductive link, to the transition part of said conductive track, and in that the measuring device is implanted on the daughterboard by being connected to the conductive transition part(s).

[0009] The invention will be better understood from the following description, which relates to a preferred embodiment, given by way of non-limiting example, and explained with reference to the accompanying schematic drawings, in which:

[0010] [Fig. 1] is a perspective view of a printed circuit board device according to the present invention, showing one of the faces, referred to as the first face, of the daughterboard,

[0011] [Fig.2] is a front view of the daughter card as shown in Fig. 1,

[0012] [Fig.3] is viewed in perspective of the printed circuit board device shown on [Fig. 1] in the opposite orientation showing the other side, called the second side, of the daughter card,

[0013] [Fig.4] is a front view of the daughter card as shown in [Fig.3].

[0014] The accompanying figures show a printed circuit board device for measuring at least one electrical quantity, said device comprising a printed circuit board 1, referred to as motherboard 1, having one face, referred to as main face, a measuring device for measuring at least one electrical quantity and for generating measurement signals and at least one current-conducting track 3 for measurement (or suitable and intended to be, or being, traversed by a current (or electric flux) to be measured).

[0015] The term “current” can be defined as the flow or movement of electric charges, in particular electrons, in the conductive track 3 or other conductive element (electrical wire, electrical / electronic component, for example) of the printed circuit board device.

[0016] In accordance with the present invention, such a printed circuit board device further comprises an additional printed circuit board, referred to as daughterboard 2, having two opposite faces, namely a first face 20 and a second face 20'. The daughterboard 2 is connected directly to the main face of the main board 1 and is held substantially perpendicular (or substantially at 90°) to the main board 1.

[0017] The term "substantially perpendicular" (or substantially at 90°) means an angle between the two motherboards 1 and daughterboards 2 (their respective planes) of 90° or approaching 90°.

[0018] In accordance with the present invention, the conductive track or tracks 3 comprise a main portion 30, 30' extending over the main face la of the motherboard 1 and a transition portion (or in other words: an intermediate or bridging portion) extending over both faces 20, 20' of the daughterboard 2, passing through it. Thus, the conductive track or tracks 3 form a conductive surface with electrical continuity by extending over the main face la of the motherboard 1 on one side of the daughterboard 2, then passing through the daughterboard 2 by means of at least one opening / slit / cutout 23 made through its thickness, and then continuing by extending over the main face la of the motherboard 1 on the other side of the daughterboard 2 (see in particular Figures 1 and 3).

[0019] The conductive track or each 3 therefore comprises a part (main part 30, 30') in the plane of the motherboard 1 on either side of the daughterboard 2 and a part (transition part) in the plane of the daughterboard 2. Thus the main conductive track or each 3 extends in two planes perpendicular to each other.

[0020] The main part 30, 30' comprises two main segments 30, 30' (located) on either side of the daughter card 2, namely a first main segment 30 and a second main segment 30', each connected, by a conductive link 8, 8', to the transition part of said conductive track 3.

[0021] The current flow F, as can be seen in particular in Figures 1 and 3, can be in one direction, going from one side of the daughterboard 2 to the other, passing through it, and vice versa. Thus, depending on the product / installation equipped with such a printed circuit board measuring device according to the present invention, for single-phase or three-phase applications, the daughterboard 2, which includes the measuring device and the transition portion of the conductive track(s) 3, is capable of measuring an electrical / physical quantity (for example, voltage and / or current as described below) in both directions, i.e., from one side of the board to the other, more particularly in the direction going from the first main segment 30 to the second main segment 30' of the conductive track(s) 3 via its transition portion, or in the opposite direction.The current flow F (or energy) can thus flow from one side of the daughterboard 2 and exit on the other side (and vice versa).

[0022] Such a conductive track 3 can be defined as a strip of, or path of, conductive material, for example copper as is generally the case for printed circuit board traces, allowing the flow of a current (or current flux F), for example a charging current for an electric vehicle or a current used to power electrical equipment or an electrical installation, and / or electrical signals. The width of such a conductive track 3 is determined according to the current it carries. In the present invention, such a conductive track 3 is specifically designed to carry a so-called high current (for example between 16A and 32A). The conductive tracks 3 can be arranged according to the printed circuit board layout (motherboard 1, daughterboard 2), taking into account the necessary connections between the components.The present invention can, as we shall see later, provide insulation between the conductive tracks 3, i.e., spaces (slots 23) suitable for ensuring (electrical) insulation between them. Furthermore, the design and routing (the process of creating the path of the conductive tracks 3 on the main board 1 and on the daughterboard 2 in their transition section) of the conductive tracks 3 is determined so as to minimize interference. The routing can also be determined or modified, for example, according to the location of the components or circuits, for example, the connector 4 or the current or voltage measurement circuit(s) 6, 7 described later, on the first or second side 20, 20' of the daughterboard 2.

[0023] The conductive track(s) 3 may preferentially extend on the surface of the motherboard 1 for their main part and on the daughterboard 2 for their transition part.

[0024] The motherboard 1 and the daughterboard 2 may be single-layer or multi-layer printed circuit boards. The printed circuit boards may be coated with a protective layer such as a varnish.

[0025] In accordance with the present invention, the measuring device is implanted on the daughter card 2 by being connected to the or one of the conductive transition parts.

[0026] The daughter card 2 may include at least one potential reference point 5 such as the neutral.

[0027] Thus, thanks to such a daughterboard 2 carrying the measuring device connected to the transition portion of the conductive track 3 and extending in a plane perpendicular to the plane of the motherboard 1, the present invention makes it possible to free up as much space as possible on the motherboard 1 for carrying out the measurements. Furthermore, the presence of the measuring device on the daughterboard 2 makes it possible to avoid or limit the heating on the motherboard 1 generated by the operation of the measuring device. Such a daughterboard 2 thus makes it possible to obtain a small footprint for the measuring section on the motherboard 1 and an improvement in heat dissipation during measurements compared to measurements carried out by a measuring device implanted directly on the motherboard 1, unlike current systems.

[0028] Preferably, the conductive link or links 8, 8' establishes, for the main conductive track or tracks 3, a metallic link joining the first main segment 30 and the first transitional conductive segment 21, and a metallic link joining the second main segment 30' and the second transitional conductive segment 21'. In a preferred embodiment of the conductive link or links 8, 8', such a conductive link 8, 8' may preferably consist of a braze. The brazing operation, in particular and preferably wave brazing, for obtaining such brazes, is a permanent assembly method that is preferred for application in the context of the present invention.Such conductive links 8, 8' thus make it possible to ensure electrical continuity of each main conductive track 3 between its part, formed by its first and second main segments 30, 30', extending over the motherboard 1 and its part, formed by its first and second transition segments 21,21', extending perpendicularly over the daughterboard 2. This brazing technique applied to the present invention to make such bonding joints, rather than using connectors, has in particular the following advantages: .

[0029] - strength and reliability of the connection: the conductive connections 8, 8' thus obtained by The brazing joints are strong and reliable, ensuring stable electrical contact and reducing the risk of loosening due to vibration or mechanical movement.

[0030] - Reduction of weak points and cost: brazing eliminates the Intermediate components, such as pins or terminals, can be points of weakness or failure. This also reduces the risk of accidental disconnection or poor contact.

[0031] - good electrical conductivity and reduced energy losses: the brazing confers high electrical conductivity, because it creates a metallic bond between the main part 30, 30' of the or each conductive track 3 on the motherboard 1 and its transition part on the daughterboard 2,

[0032] - resistance to external influences: the brazing provides protection against, by For example, humidity, dust, and other contaminants.

[0033] Preferably, in order to route the measurement signals outside the daughterboard 2, the latter may include a connector 4 connected to the measuring device (see in particular Figures 1 to 3). The connector 4 may be surface-mounted on the first or second face 20, 20' of the daughterboard 2. Preferably, the connector 4 is mounted on the same face as that on which the measuring device is mounted or at least one of the measuring circuits 6, 7 thereof described below.

[0034] The acquisition and processing of measurement signals (generated by the measurement device) can preferably be carried out by a processing circuit, microcontroller or processor, present on the motherboard 1, preferably on its main face on which the daughterboard 2 is assembled / connected.

[0035] Such a printed circuit board device according to the present invention can be configured for application to a single-phase or multi-phase network. In the case of application to a single-phase network, the printed circuit board device may comprise a single main conductive trace 3 and a single conductive transition.

[0036] In the case of an application to a multiphase network, for example three-phase (as illustrated in Figures 1 to 4), for example for the transmission of high currents (for example, on the order of 16 A to 32 A), as can be seen in the attached Figures 1 to 4, such a printed circuit board device according to the present invention can be configured to include several conductive traces 3, and thus several transition sections on the daughterboard 2, preferably located next to each other, each dedicated to one of the phases. Thus, according to a feature of the present invention, each main conductive trace 3 (and therefore each transition section on the daughterboard 2) can be dedicated to one of the phases of the current, being suitable and intended to carry, or being carried, a single-phase current. Each phase therefore has its own main conductive trace 3, and its own conductive transition on the daughterboard 2.Each phase carries a current in phase relation to the others.

[0037] In a preferred form of the daughterboard 2, as can be seen in Figures 1 to 4, the daughterboard 2 may include an edge 22, referred to as the electrical connection edge 22, parallel and adjacent to the main face of the motherboard 1 (or the motherboard 1). The electrical connection edge 22 may include along its length at least two transverse slots 23 and one or more electrical connection pads 24 separated from each other by the slots 23. Transverse sections delimiting one or more of the electrical connection pads 24. Each electrical connection pad 24 is dedicated to each conductive track 3 and has two opposite sides, namely a first side in the plane of the first face 20 of the daughterboard 2 and a second side in the plane of the second face 20' of the daughterboard 2, connected to each other by small sides 25 (or edges 25), each forming one side of one of the slots 23. The transition portion of each conductive track 3 can then extend over both sides of the dedicated electrical connection pad 24 and, preferably, over at least one of the small sides 25.

[0038] One of the slots 23 can also separate one of the electrical connection and linking pads 24 from the potential reference point 5. The potential reference point 5 can also be formed by a pad 24', called the potential connection and reference pad 24', dedicated to such a potential reference and used in particular for voltage measurement (described later).

[0039] It is understood that the electrical connection and linking pads 24, where applicable the potential reference pad 24', spaced apart by the slots 23, are arranged side by side (or aligned) along the connection edge 22 of the daughter card 2.

[0040] Preferably, the potential reference point 5 (or the potential reference pad 24), as can be seen in Figures 1 to 4, can be placed near one of the edges perpendicular to the connecting edge 22.

[0041] Preferably, the connector 4 can be located near one of the edges perpendicular to the connection edge 22, preferably opposite the connection and potential reference point or stud 24'.

[0042] This embodiment of the daughter card 2 with the pins 24 and electrical connection dedicated each to a phase and (electrically) separated from each other by the slots 23 allows the phases to be isolated from each other or the phase and the neutral.

[0043] If we now refer more particularly to Figures 1 to 2, we can see that the measuring device is configured to measure a current. To this end, we can see that it may include at least one current measuring circuit 6. The current circuit or circuits 6 are dedicated to the transition portion 20, 21' of the conductive track(s) 3 and are surface-mounted on the first or second face 20, 20' of the daughterboard 2. Furthermore, the transition portion of the conductive track(s) 3 may include a first transition segment 21 connected to the first main segment 30 of the main portion 30, 30' of the conductive track(s) 3 and a second transition segment 21' connected to the second main segment 30' of the main portion 30, 30' of the conductive track(s) 3.Furthermore, the first transition segment 21 can be connected to the second transition segment 21' via the measuring circuit 6 so as to allow the latter to be able to measure the current. traversing the transition (dedicated) part and thus enabling the measuring device to measure the current flowing through the conductive track or each 3 since the current flowing in the main part 30, 30' of the conductive track or each 3 is the same as that flowing in the corresponding transition part towards the measuring device.

[0044] Preferably, the current measurement circuit 6 may include at least one Hall effect current sensor. It should be noted that the Hall effect generates a voltage proportional to the magnetic flux density. The use of such a Hall effect sensor offers, in particular, the following advantages:

[0045] - Non-contact measurement: the Hall effect sensor 6 allows currents to be measured without establishing a direct electrical connection with the conductor. This minimizes disturbances in the circuit and reduces the risk of short circuits or electric shocks.

[0046] - electrical insulation: as the measurement is carried out through a field The magnetic Hall effect sensor provides electrical isolation between the Hall effect measuring circuit and the circuit carrying the measured current (conductive trace 3). This is particularly important for safety reasons and to protect sensitive circuits.

[0047] - Extended measuring range: the Hall effect sensor allows for the measurement of a wide range of currents, from low to very high, which makes the measuring device, according to the present invention, versatile for different applications,

[0048] - Fast response: The Hall effect sensor has fast response times, allowing for to accurately capture transient current variations or current peaks,

[0049] - Durability and reliability: the hall effect sensor has no moving parts, which makes it Robust and durable. It can operate in harsh environments without suffering mechanical damage.

[0050] - Compatibility with hostile environments: the Hall effect sensor is resistant well-suited to harsh environmental conditions, such as extreme temperatures, humidity or dust,

[0051] The choice of a Hall effect sensor 6 (or Hall effect technology) thus offers significant advantages in the present invention in terms of safety, isolation, flexibility and durability.

[0052] Preferably, the current measurement circuit 6, for example comprising at least one such Hall effect sensor, is an integrated circuit. This feature, particularly with the Hall effect sensor integrated into the integrated circuit, offers several advantages, notably in terms of size (miniaturization), cost, performance, and integration with other electronic components. Indeed, the integrated circuit, for example incorporating a Hall effect sensor, makes it possible to create a smaller device and Its compact size is advantageous in fields such as automotive electronics, charging stations, and electricity meters. Furthermore, integrating a Hall effect sensor into such an integrated circuit improves measurement accuracy and reduces electromagnetic interference (EMI). In addition, a Hall effect sensor provides electrical isolation from the measured current, which can be beneficial in an integrated circuit where isolation is crucial to prevent short circuits or electrical discharges. Finally, an integrated circuit can include additional functionalities (beyond those of the Hall effect sensor itself) such as signal conditioning circuits, analog-to-digital converters (ADCs), calibration functions, and digital interfaces.Finally, the integration of a Hall effect sensor into such an integrated circuit allows said sensor to interact easily with other electronic components, thus facilitating interfacing and communication with microcontrollers, processors or communication systems.

[0053] Preferably, for example, the present invention may provide that such an integrated circuit is an integrated circuit known under the reference ACS37002 from ALLEGRO microsystems. Such an ACS37002 circuit is a fully integrated, high-precision Hall effect current sensor.

[0054] If we refer in particular to figures 1 and 2, we can see that, preferably, the connection between the first and second transition segments 21, 21' and the dedicated current measurement circuit or each 6 is located on the face 20, 20' (first or second face) of the daughterboard 2 on which the current measurement circuit 6 is surface mounted. Thus, the current flowing through the conductive track or each 3 enters the current measurement circuit 6 and exits it on the same face 20, 20' of the daughterboard 2.It can be seen in particular in figures 1 and 3 that the current flow (F) through the or each conductive track 3 goes in the direction of the first face 20 of the daughterboard 2 towards its second face 20' and enters each measurement circuit 6 by being routed on the first face 20 of the daughterboard by the first transition segment 21 then exits the measurement circuit 6 on the same first face by being routed by the second transition segment 21', passing through the daughterboard 2, towards the other side of the daughterboard 2. .

[0055] More particularly, in Figures 1 and 2, it can be seen that each current measurement circuit 6, dedicated to each phase, is surface-mounted on the first face 20 of the daughterboard 2 and that, for each measurement circuit 6 dedicated to the transition portion of one of the conductive tracks 3, the connection points 60 (or the pins 60 of the integrated circuit) of the current measurement circuit 6 are all located on the first face 20 of the daughterboard and that, consequently, the first and second transition segments 21, 21' are each connected to said connection points 60 on the first side 20 of the daughterboard 2. We can also see, for each conductive trace 3 and each dedicated current measurement circuit 6:

[0056] - that the first transition segment 20 extends from its conductive bond 8 (soldering) with the first main segment 30 on the side of the first face 20 of the daughterboard 2 up to the connection points 60 of the measuring circuit 6 located on the same side. In the embodiment with the connection pads 24, the first transition segment 20 thus extends over the first side 25 of the pad 24,

[0057] - and that the second transition segment 21' extends from its conductive bond 8' (soldering) with the second main segment 30' on the side of the second face 20' of the daughterboard 2 to the connection points 60 of the measuring circuit 6 located on the other side on the first face 20 of the daughterboard 2. It can also be seen that the second transition segment 21' passes through the daughterboard 2 via one of the slots 23, extending over one of the short sides 26 of the pad 24. In the embodiment with the connection pads 24, the second transition segment 21' thus extends over the first and second sides 25, 25' of the pad 24. On the first side 25 of the pad 24, or more generally, on the first face 20 of the daughterboard 2, the first transition segment 21 is electrically separated from the second transition segment 21', that is to say, the first transition segment 21 is only electrically connected to the second segment of transition 21' via the current measurement circuit(s) 6.

[0058] Referring now to Figures 3 and 4, we can see that the measuring circuit(s) of the measuring device can be a voltage measuring circuit 7. The voltage measuring circuit(s) 7 can be surface-mounted on the first or second face 20, 20' of the daughterboard 2, connected, on the one hand, to the transition portion of one or more of the conductive tracks 3 and, on the other hand, to the potential reference point 5 on the daughterboard 2 or to the transition portion of another conductive track 3, so as to be able to measure:

[0059] - the phase voltage, that is to say, between the (phase) voltage between the part of transition of the conductive track(s) 3 and the potential reference point 5 and thus the phase voltage between the conductive track(s) 3 and the potential reference point 5,

[0060] - or the voltage between phases, that is to say the voltage (between phases) between the transition parts of two conductive tracks 3 and thus between two conductive tracks 3.

[0061] Preferably, the voltage measurement circuit or circuits 7 are implemented using a voltage divider system, preferably a voltage divider system using operational amplifiers. Preferably, the voltage dividers can be dimensioned to comply with the required insulation distances and creepage distances. Furthermore, these resistors and operational amplifiers can be chosen to meet the specifications regarding mains voltage.

[0062] The present invention may provide, as can be seen in Figures 1 to 4, that the measuring device comprises at least one such current measuring circuit 6 and at least one such voltage measuring circuit 7. Preferably, the current measuring circuit or circuits 6 may be surface mounted on one of the faces 20, 20' of the daughterboard 2 and the voltage measuring circuit or circuits may be surface mounted on the other face 20, 20' of the daughterboard 2. Thus, in a preferred arrangement / implantation on the daughterboard 2, the current measuring part (the current measuring circuit or circuits 6) may be surface mounted on the first face 20 (or one of the faces) of the daughterboard 2 (Figures 1 to 2) and the voltage measuring part (the voltage measuring circuit or circuits) may be located on the second face (or the other face) of the daughterboard 2 (Figures 3 to 4).

[0063] Preferably, the motherboard 1 can be an electronic power and / or load control board.

[0064] In such a printed circuit board device according to the present invention, the electrical quantities measured by the measuring device on the daughterboard 2 are therefore more particularly the current and / or the voltage, and therefore also the power.

[0065] The advantages of such a printed circuit board device may include, but are not limited to:

[0066] - a reduced footprint due to the presence of at least one of the elements / arrangements following on daughterboard 2: measuring device, connector, electrical connection and bonding pads 24 and potential reference pad 24' arranged side by side along the connection edge 22 of daughterboard 2,

[0067] - cost (use of integrated circuits, in particular with Hall effect sensors),

[0068] - the phases can be reassigned according to the product / routing,

[0069] - making the electrical connection or link between the motherboard 1 and the daughterboard 2 by brazing (wave brazing),

[0070] - improved heat dissipation.

[0071] The present invention also relates to an electric vehicle charging station or an electric vehicle, comprising a printed circuit board device enabling the measurement of at least one electrical quantity.

[0072] According to the present invention, in such an electric vehicle charging station or such an electric vehicle, the printed circuit board device consists of a printed circuit board device according to the present invention.

[0073] The present invention further relates to an electrical / electronic meter for measuring electrical consumption, comprising a printed circuit board device enabling the measurement of at least one electrical quantity.

[0074] According to the present invention, in such an electric / electronic meter, the printed circuit board device consists of a printed circuit board device according to the present invention.

[0075] Preferably, in such a vehicle charging station or in such an electric / electronic meter, the motherboard 1 can be an electronic power and / or load control board.

[0076] The present invention relates more particularly to the field of residential and commercial electrical equipment and, more particularly, to the electric charging of vehicles and electric meters.

[0077] Of course, the invention is not limited to the embodiment described and shown in the accompanying drawings. Modifications remain possible, particularly with regard to the composition of the various elements or by substitution of technical equivalents, without departing from the scope of protection of the invention.

Claims

Demands

1. Printed circuit board device for measuring at least one electrical quantity, said device comprising a printed circuit board (1), referred to as the main board (1), having one face, referred to as the main face (la), a measuring device for measuring at least one electrical quantity and generating measurement signals, and at least one current-conducting trace (3) for measurement, characterized in that it further comprises an additional printed circuit board, referred to as the daughter board (2), having two opposite faces, namely a first face (20) and a second face (20'), and being connected directly to the main face (la) of the main board (1) while being held substantially perpendicular to the main board (1), in that the conductive trace or traces (3) comprise a main portion (30, 30') extending over the main face (la) of the main board (1) and a transition portion extending over both faces (20,20') of the daughterboard (2) by passing through it, the main part (30, 30') comprising two main segments (30, 30') on either side of the daughterboard (2), namely a first main segment (30) and a second main segment (30'), each connected, by a conductive link (8, 8'), to the transition part of said conductive track (3) and in that the measuring device is implanted on the daughterboard (2) by being connected to the or one of the conductive transition parts.,

2. Printed circuit board device according to claim 1, characterized in that the conductive link (8, 8') consists of a solder joint.

3. Printed circuit board device according to any one of claims 1 to 2, characterized in that each conductive track (3) is dedicated to one of the phases of the current by being suitable and intended to be carried, or being carried, by a single-phase current.

4. Printed circuit board device according to any one of claims 1 to 3, characterized in that the daughterboard (2) has an electrical connection and bonding edge (22) parallel and adjacent to the main face (1) of the motherboard (1), said electrical connection and bonding edge (22) comprising along its length at least two transverse slots (23) and one or more pad(s) (24) electrical connection and linking electrically separated from each other by the transverse slots (23) delimiting between them the one or one of the electrical connection and linking pads (24), the one or each electrical connection and linking pad (24) being dedicated to the one or each conductive track (3) and having two opposite sides, namely a first side in the plane of the first face (20) of the daughter card (2) and a second side in the plane of the second face (20') of the daughter card (2), connected to each other by short sides (25) each forming one side of one of the slots (23) and in that the transition part of the one or each conductive track (3) extends over both sides of the dedicated electrical connection and linking pad (24) and, preferably, over at least one of the short sides (25).

5. Printed circuit board device according to any one of claims 1 to 4, characterized in that the daughterboard (2) includes a connector (4) for routing measurement signals out of the daughterboard (2), said connector (4) being connected to the measurement device and surface mounted on the first or second face (20, 20') of the daughterboard (2).

6. Printed circuit board device according to any one of claims 1 to 5, characterized in that the measuring device comprises at least one current measuring circuit (6) dedicated to the transition portion (20, 21') of the conductive track(s) (3) and surface-mounted on the first or second face (20, 20') of the daughterboard (2), and in that the transition portion of the conductive track(s) (3) comprises a first transition segment (21) connected to the first main segment (30) of the main portion (30, 30') of the conductive track(s) (3) and a second transition segment (21') connected to the second main segment (30') of the main portion (30,30') of the one or more of the conductive tracks (3) and in that the first transition segment (21) is connected to the second transition segment (21') via the measuring circuit (6) so as to allow the latter to measure the current flowing through the transition part and thus to allow the measuring device to measure the current flowing through the one or each conductive track (3).

7. Printed circuit board device according to claim 6, characterized in that the current measurement circuit (6) comprises at least one Hall effect current sensor.

8. Printed circuit board device according to any one of claims 6 to 7, characterized in that the current measurement circuit (6) is an integrated circuit.

9. Printed circuit board device according to any one of claims 6 to 8, characterized in that the connection between the first and second transition segments (21, 21') and the dedicated current measurement circuit or circuits (6) is located on the face (20, 20') of the daughterboard (2) on which the current measurement circuit (6) is surface mounted.

10. Printed circuit board device according to any one of claims 1 to 9, characterized in that the or at least one of the measuring circuits is a voltage measuring circuit (7) and is surface mounted on the first or second face (20, 20') of the daughterboard (2) by being connected, on the one hand, to the transition part of the or one of the conductive tracks (3) and, on the other hand, to a potential reference point (5) on the daughterboard (2) or to the transition part of another conductive track (3) so as to be able to measure the phase voltage between the transition part of the or each conductive track (3) and the potential reference point (5) and thus the phase voltage between the or each conductive track (3) and the potential reference point (5) or to be able to measure the phase voltage between the transition parts of two conductive tracks (3) and thus between two conductive tracks (3).

11. Printed circuit board device according to claim 10, characterized in that the voltage measurement circuit or each circuit (7) is made from a system of voltage dividers, preferably a system of voltage dividers using operational amplifiers.

12. Printed circuit board device according to any one of claims 6 to 9, each with any one of claims 10 to 11, characterized in that the current measurement circuit or circuits (6) is surface mounted on one face (20, 20') of the daughterboard (2) and the voltage measurement circuit or circuits (7) is surface mounted on the other face (20, 20') of the daughterboard (2).

13. Printed circuit board device according to any one of claims 1 to 12, characterized in that the motherboard (1) is an electronic power and / or load control board.

14. Charging station for an electric vehicle or electric vehicle, comprising a printed circuit board device for measuring at least one electrical quantity, characterized in that said printed circuit board device consists of a printed circuit board device according to any one of claims 1 to

15. 13. Electric / electronic meter for measuring electrical consumption, comprising a printed circuit board device enabling the measurement of at least one electrical quantity, characterized in that said printed circuit board device consists of a printed circuit board device according to any one of claims 1 to 13.

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