FR3056074A1 - ELECTRICAL DEVICE, IN PARTICULAR FOR INTEGRATING IN A VOLTAGE CONVERTER FOR A MOTOR VEHICLE - Google Patents

Abstract

The invention relates to an electrical device (30), in particular intended to be integrated in a voltage converter for a motor vehicle, comprising: - a support (10), the support being made of electrically conductive material and being electrically connected to an electric potential of reference, - an electronic unit (20) disposed on the support (10), the electronic unit (20) comprising at least one electrically conductive track, wherein the electronic unit (20) is fixed to the support (10) by snap-in an electrically conductive material such that the cutter electrically connects the electrically conductive track of the electronic unit (20) to the carrier (10).

Description

® FRENCH REPUBLIC

NATIONAL INSTITUTE OF INDUSTRIAL PROPERTY © Publication number: 3,056,074 (to be used only for reproduction orders)

©) National registration number: 16 58407

COURBEVOIE © IntCI ⁸ : H 05 K 7/04 (2017.01), H 05 K 3/36, H 02 M 1/44

A1 PATENT APPLICATION

©) Date of filing: 09.09.16. ® Applicant (s): VALEO CONTROL SYSTEMS ©) Priority: MOTELIR Simplified joint-stock company - FR. @ Inventor (s): MANUAL FALGUIER and SANCHES MICHAEL. (43) Date of public availability of the request: 16.03.18 Bulletin 18/11. ©) List of documents cited in the report preliminary research: Refer to end of present booklet (© References to other national documents ® Holder (s): VALEO CONTROL SYSTEMS related: ENGINE Simplified joint-stock company. ©) Extension request (s): ® Agent (s): VALEO CONTROL SYSTEMS ENGINE Simplified joint-stock company.

ELECTRIC DEVICE, PARTICULARLY FOR INTEGRATING INTO A VOLTAGE CONVERTER FOR A MOTOR VEHICLE.

FR 3,056,074 - A1 (tv) The invention relates to an electrical device (30), in particular intended to be integrated in a voltage converter for a motor vehicle, comprising:

a support (10), the support being made of electrically conductive material and being electrically connected to a reference electrical potential,

- an electronic unit (20) disposed on the support (10), the electronic unit (20) comprising at least one electrically conductive track, in which the electronic unit (20) is fixed to the support (10) by snap-fastening an electrically conductive material so that the bolt electrically connects the electrically conductive track of the electronic unit (20) to the support (10).

-1 Electrical device, in particular intended to be integrated in a voltage converter for a motor vehicle

The subject of the invention is an electrical device, in particular intended to be integrated in a voltage converter for a motor vehicle, as well as a method of assembling such an electrical device.

The invention also relates to a voltage converter comprising such an electrical device and electrical equipment comprising an electric machine and such a voltage converter.

In general, an electric motor, in particular for a motor vehicle, comprises an inverter comprising electronic power modules arranged on a chassis and controlled by an electronic control card.

The electronic power modules of the electric motor are supplied by a power interface requiring two terminals. However, in such an electric motor, the power mass of the power interface is connected by an electric cable to the inverter, which results in the generation of electromagnetic disturbances.

In order to reduce or even eliminate these electromagnetic disturbances, it is necessary to have a common mode filter at the level of the electronic control card. To achieve this common mode filter, the chassis is electrically connected to the electronic control card in order to make a common mode filter between the chassis ground and the two terminals of the power interface.

There is a known device having the integration of a ground braid between a chassis and an electronic control card. More specifically, a metal braid is screwed at one end to the chassis and at the other end to the electronic control card. However, this technical solution is expensive because it requires the use of specific parts, for example a metal braid, a screw and a specific component integrated on the electronic control card intended for

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-2 welcome the screw of the metal braid. In particular, this specific component of the electronic control card is expensive and difficult to manufacture.

There is also known a device having the integration of a connection blade between a chassis and an electronic control card. More specifically, one end of the connection blade is screwed onto a part having a ground potential of the chassis, and the other end of the connection blade cooperates with a metallized orifice of the electronic control card. This second end is intended to be welded, in particular by wave welding, to the electronic control card. However, this technical solution is expensive and bulky because it requires the use of specific parts, for example a connection blade and a screw having an exclusion zone around its axis for the passage of specific tools, and the use of wave soldering on the electronic control card.

The present invention aims to remedy these drawbacks by proposing an electrical device which does not require the addition of additional parts in order to electrically connect the ground potential of the chassis to the common mode filter.

To this end, the subject of the invention is an electrical device, in particular intended to be integrated in a voltage converter for a motor vehicle, comprising:

a support, the support being made of electrically conductive material and being electrically connected to an electrical reference potential, an electronic unit disposed on the support, the electronic unit comprising at least one electrically conductive track, in which the electronic unit is fixed to the support by bolting an electrically conductive material so that the bolt electrically connects the electrically conductive track of the electronic unit to the support.

Advantageously, the electrical device according to the invention allows a reduction in the cost of the electrical connection between the reference electrical potential and the electronic unit, in particular while facilitating the mounting of the electronic unit within the voltage converter.

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-3 In addition, such an electrical device allows a reduction in the number of parts in the device making it possible to electrically connect the reference electrical potential and the electronic unit.

The electrical device according to the invention may also include one or more of the following characteristics, considered individually or in all possible combinations:

the support comprising at least one positioning member, the electronic unit comprising a positioning orifice complementary to the support positioning member, and in which the electronic unit is fixed to the support at least by snap-fastening of the positioning member of the support in the complementary positioning orifice of the electronic unit; and / or the electronic unit is an electronic control unit configured to control an electronic power unit, the electronic control unit being fixed to the support by bolting an electrically conductive material so that the bolt electrically connects the conductive track electrically from the electronic control unit to the support; and / or each positioning orifice of the electronic control unit comprises a connection pad made of electrically conductive material, the connection pad being in contact with the complementary positioning member which is attached to the support, the connection pad being electrically connected to the electrically conductive track of the electronic control unit; and / or the electrical device also comprises an electronic power unit, the support supporting the electronic power unit, the electronic control unit being electrically connected to the electronic power unit, and in which the support, the unit power electronics and the electronic control unit each extend in substantially parallel planes and are superimposed on each other in this order; and / or the electronic unit is an electronic power unit, the electronic power unit being fixed to the support by stapling of an electrically conductive material so that the stapling electrically connects the track

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-4 electrically conductive from the electronic power unit to the support; and / or the electrical device also comprises an electronic control unit configured to control the electronic power unit, the electrically conductive track of the electronic power unit electrically connecting the electronic power unit to the electronic control unit, and in which the support, the electronic power unit and the electronic control unit each extend in substantially parallel planes and are superimposed on each other in this order; and / or the electrically conductive track of the electronic unit is electrically connected to an electronic circuit of the electronic control unit, in particular an electronic filter; and / or the electronic circuit of the electronic control unit is a common mode filter; and / or the electrically conductive track of the electronic unit is electrically connected to a temperature sensor; and / or the support of the electronic power unit is a heat sink, and / or the electronic power unit comprises at least one electronic power module, and / or the electronic control unit is an electronic control card .

The invention also relates to a voltage converter intended to control an electrical energy exchanged between an electrical machine and an electrical power source comprising an electrical device according to the invention.

The invention also relates to electrical equipment comprising an electrical machine and a voltage converter according to the invention, in which the voltage converter is mounted on the electrical machine.

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-5 The invention also relates to a method of assembling an electrical device according to the invention, comprising at least the following steps:

a step of supplying a support and an electronic unit, the support being made of electrically conductive material and being electrically connected to a reference potential, the electronic unit being arranged on the support and comprising at least one electrically conductive track , a stopping step during which the electronic unit is fixed to the support by stirring an electrically conductive material so that the stapling electrically connects the electrically conductive track of the electronic unit to the support.

Other characteristics and advantages of the present invention will appear on reading the detailed description of embodiments given by way of nonlimiting examples and illustrated, accompanied by the following figures:

Figures 1 and 2 show schematic sectional views of an electrical device according to embodiments of the invention, Figure 3 is an enlarged sectional view of an electronic unit and a support of an electrical device according to the invention before rolling, FIG. 4 is an enlarged sectional view of an electrical device according to an embodiment of the invention, FIG. 5 represents an exploded view of the elements of a voltage converter comprising an electrical device according to one embodiment of the invention, before rolling, and FIGS. 6a and 6b represent flow diagrams of the methods of assembling an electrical device according to embodiments of the invention.

It should be noted that these drawings have no other purpose than to illustrate the text of the description and do not in any way constitute a limitation of the scope of the invention.

In the various figures, similar elements are designated by identical references.

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The invention relates to an electrical device which can be intended to be integrated into a voltage converter for a motor vehicle.

The electrical device according to the invention comprises a support and an electronic unit.

The electronic unit can be, for example, an electronic power unit such as an electronic power module or an electronic control unit such as an electronic control card.

The electronic unit includes at least one electrically conductive track.

The electronic unit can be placed on the support. The support can be a heat sink configured to dissipate the heat generated by the electronic unit when the electronic unit is placed on the support. For example, the support 10 may include a cavity at the bottom of which the electronic unit is supported. The electronic unit can be supported on the support, for example on a wall of the support extending from the bottom of the cavity and around said cavity of the support.

The support is made of electrically conductive material, for example aluminum.

The support is electrically connected to a reference electrical potential, in particular called the chassis ground potential.

The electronic unit is fixed to the support by stapling of an electrically conductive material, for example aluminum, so that the stapler electrically connects the electrically conductive track of the electronic unit to the support. Advantageously, the fixing of the electronic unit to the support by bolting makes it possible to electrically connect the electronic unit to the reference electrical potential of the support.

The support may include one or a plurality of positioning members. A support positioning member can extend from the bottom of the support cavity in a direction transverse to said bottom. A positioning member is made of the same electrically conductive material as the support, so that a positioning member is an electrical conductor.

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The electronic unit may include one or a plurality of positioning holes complementary to the positioning members of the support.

The electronic unit can be fixed to the support at least by fastening the 5 positioning members of the support in the complementary positioning orifices of the electronic unit.

Advantageously, such attachment of the electronic unit to the support allows mechanical strength of the electronic unit on the support, while allowing the electronic unit to be connected to the reference electrical potential of the support.

Preferably, the support positioning members are made of aluminum, so that the mounting of the electronic unit on the support is an aluminum mounting.

FIG. 1 represents a support 10 and an electronic unit 20 before the electronic unit is bolted to the support. In particular, the support 10 comprises a positioning member 12 and the electronic unit 20 comprises a positioning orifice 22 complementary to the positioning member 12 of the support 10. The positioning member 12 of the support 10 and the orifice of positioning 22 of the electronic unit 20 cooperate with one another so as to position the electronic unit 20 on the support 10.

FIG. 2 represents a part of an electrical device 30 according to the invention comprising a support 10 and an electronic unit 20 after the electronic unit has been bolted to the support. In particular, a positioning member 12 of the support is stuck in a positioning orifice 22 of the electronic unit 20.

FIG. 3 illustrates a first embodiment of an electrical device 30 according to the invention. In particular, the electronic unit is an electronic control unit 40, for example an electronic control card.

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- 8 In this first embodiment, the electronic control unit 40 is fixed to the support 10 by stirring with an electrically conductive material. In particular, the rolling of the electronic control unit 40 on the support 10 electrically connects the electrically conductive track of the electronic control unit 40 to the support 10.

The electronic control unit 40 can comprise a connection pad 44 made of electrically conductive material, for example copper, disposed at each positioning orifice 42 of the electronic control unit 40. In particular, a positioning orifice 42 may have a substantially circular section, and include a connection pad 44 of shape substantially complementary to the shape of the positioning orifice 42.

The electronic control unit 40 can be of substantially planar shape and include two faces. A connection pad 44 preferably extends on each face of the electronic control unit 40 and in the positioning hole 42. More specifically, a connection pad 44 is present at each end of a positioning hole 42 In other words, a patch of connections 44 is present on each face of the electronic control unit 40, as well as on the walls of the electronic control unit 40 delimiting the positioning orifice 42.

Advantageously, a connection pad present on both sides and in the positioning hole of the electronic control unit makes it possible to reinforce the electronic control unit when the electronic control unit is stuck on the support.

In particular, as shown in FIG. 3, each connection pad 44 can be in contact with a complementary positioning member 12 daisy-pressed from the support 10.

Each connection pad 44 can be electrically connected to the electrically conductive track of the electronic control unit 40.

The electrical device 30 can also include an electronic power unit 50, for example one or more electronic power modules. In particular, the electronic control unit 40 is configured to control the electronic power unit.

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-9In particular, the electronic power unit 50 can be supported by the bottom of the cavity 14 of the support 10. Preferably, the electronic power unit 50 is fixed to the support 10, in particular by gluing and / or screwing.

Preferably, the electronic control unit 40 and the electronic power unit 50 are electrically connected, in particular via electrical connection elements 60 as shown in FIG. 3.

FIG. 4 illustrates a second embodiment of an electrical device 30 according to the invention, in which the electronic unit is an electronic power unit 50, for example one or more electronic power modules.

In this second embodiment, the support 10, and more precisely the bottom of the cavity 14 of the support 10, is configured to support the electronic power unit 50. For example, the cavity 14 of the support 10 may include a protrusion 16 extending from the bottom of the cavity 14, in a direction substantially perpendicular to said bottom. The electronic power unit 50 can be supported by the projection 16 of the support 10.

The electronic power unit 50 can be fixed to the support 10 by stirring with an electrically conductive material. More specifically, the staking of the positioning members 12 of the support 10 in the positioning orifices 52 complementary to the electronic power unit 50 electrically connects the electrically conductive track 54 of the electronic power unit 50 to the support 10.

The electrical device 30 can also include an electronic control unit 40, for example an electronic control card, configured to control the electronic power unit 50.

In particular, the electrically conductive track 54 of the electronic power unit 50 can electrically connect the electronic power unit 50 to the electronic control unit 40.

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- ίο In addition, as illustrated in Figures 3 and 4, the support 10, the electronic power unit 50 and the electronic control unit 40 each extend in substantially parallel planes and are superimposed on each other in this order.

In addition, the electronic control unit 40 may include an electronic circuit, for example an electronic filter. The electronic circuit of the electronic control unit 40 can be a common mode filter. The electronic filter may for example comprise one or a plurality of inductors and / or one or a plurality of capacitors.

In particular, the electrically conductive track of the electronic unit can be electrically connected to the electronic circuit of the electronic control unit 40.

More specifically, in the first embodiment, the electrically conductive track of the electronic control unit 40 is electrically connected to the electronic circuit of the electronic control unit 40.

In the second embodiment, the electrically conductive track 54 of the electronic power unit 50 is electrically connected to the electronic circuit of the electronic control unit 40.

The electrical device according to the invention may also include one or a plurality of capacitors configured to stabilize an electrical voltage received by the electrical device and to reduce the electromagnetic disturbances generated by the electronic units.

The capacitors of the electrical device, for example chemical capacitors, are electrically connected to the electronic control unit and to the electronic power unit, and can be supported by the support, for example in specific reception areas of the support.

In general, the temperature of the capacitors of the electrical device in operation can reach a hundred degrees, for example 150 ° C.

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- it In order to know the temperature of the capacitors of the electrical device, the electrically conductive track of the electronic unit can be electrically connected to a temperature sensor.

More specifically, in the first embodiment, the electrically conductive track 5 of the electronic control unit 40 is electrically connected to a temperature sensor.

Advantageously, a temperature sensor disposed near a connection pad of the electronic control unit makes it possible to measure the temperature of the support and therefore to calculate a temperature of the capacitors of the electrical device.

In the second embodiment, the electrically conductive track 54 of the electronic power unit 50 is electrically connected to a temperature sensor.

An exploded view of the elements of an electrical device before rolling is shown in FIG. 5.

The electrical device comprises a support 10, an electronic power unit 50, an electronic control unit 40 and an electrical connection bar 70.

The electronic power unit 50 comprises three electronic power modules in FIG. 5.

The electronic power unit 50 comprises positioning holes 52, six in number in FIG. 5, and the support comprises positioning members 12, six positioning members 12 are shown in FIG. 5. The electronic unit power 50 is intended to be bolted to the support 10 by bolting an electrically conductive material.

The electrical connection bar 70 can be arranged between the electronic power unit 50 and the electronic control unit 40. The electrical connection bar

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- 12 70 is configured to electrically connect the electronic power unit 50 and the electronic control unit 40.

The electrical connection bar 70 may comprise positioning members 72, shown in FIG. 5. The positioning members 72 are preferably made of electrically insulating material, for example plastic material. More specifically, the electrical connection bar 70 can be of substantially planar shape and comprise positioning members 72 extending from the plane of the electrical connection bar 70 in a direction transverse to said plane, in particular in the direction of an electronic unit. .

The electronic control unit 40 may include positioning holes 42, seven in number in FIG. 5. The positioning holes 42 of the electronic control unit 40 are intended to be bolted to the positioning members 72 of the bar of electrical connection 70 by bolting an electrically insulating material.

The invention also relates to a voltage converter comprising an electrical device as described above. An example of a voltage converter is illustrated in Figure 5.

The voltage converter is intended to control an electrical energy exchanged between an electrical machine and an electrical power source. In particular, the voltage converter can be mounted on the electric machine.

Electrical equipment can include the electrical machine and the voltage converter according to the invention.

The invention also relates to a method of assembling an electrical device according to the invention.

The assembly process includes a supply step, in which a support and an electronic unit as described above are provided.

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- 13 More specifically, the assembly process may include a step of supplying, in particular denoted S10 in FIGS. 6a and 6b, a support, an electronic control unit and an electronic power unit.

The assembly process may include, following the supply step, an assembly step 5, denoted S20 in FIGS. 6a and 6b, in which the electronic power unit is arranged on the support.

The assembly process also includes a bolting step, during which the electronic unit is fixed to the support by bolting.

FIG. 6a represents a method of assembling an electrical device according to the first embodiment.

The assembly process may include, following the supply step S10 and the assembly step S20, an assembly step S30 in which the electronic control unit is arranged on the support.

Following the assembly step S30, the assembly method can also include a connection step S40, in which the electronic power unit and the electronic control unit are electrically connected.

In addition, the assembly process may include, following the connection step S40, a step of bolting S50 of the electronic control unit on the support.

FIG. 6b represents a method of assembling an electrical device according to the second embodiment.

The assembly process may include, following the supply step S10 and the assembly step S20, a step of bolting S60 of the electronic power unit on the support.

The assembly process can also include, following the step of bolting S60 and before the step of connection S40, an assembly step S30 in which the electronic control unit is arranged on the support.

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- 14 The assembly process may include the connection step S40, in which the electronic power unit and the electronic control unit are electrically connected.

In addition, following the connection step S40, the assembly method can comprise a bolting step S70, in which the electronic control unit is bolted to the electrical connection bar by a plastic bolting.

The electrical device according to the invention has been described in the context of a voltage converter which manages an energy exchange between an electrical machine on board a motor vehicle and an electrical network of said motor vehicle. Of course, the invention is in no way limited to the embodiments described and illustrated, which have been given only by way of examples. On the contrary, other applications of the electrical device according to the invention are also possible without departing from the scope of the invention.

CFR0973 - PEL 15 027

Claims (13)

1. An electrical device (30), in particular intended to be integrated in a voltage converter for a motor vehicle, comprising: 5 - a support (10), the support being made of electrically conductive material and being electrically connected to an electrical reference potential, an electronic unit (20) disposed on the support (10), the electronic unit (20) comprising at least an electrically conductive track, in which the electronic unit (20) is fixed to the support (10) by fixing 10 of an electrically conductive material so that the bolt electrically connects the electrically conductive track of the electronic unit (20) to the support (10). 2. Electrical device according to claim 1, the support (10) comprising at least one Positioning member (12), the electronic unit (20) comprising a positioning orifice (22) complementary to the positioning member (12) of the support (10), and in which the electronic unit (20) is fixed to the support (10) at least by snap-fastening the positioning member (12) of the support (10) into the positioning orifice (22) complementary to the electronic unit (20). 3. Electrical device according to one of claims 1 or 2, wherein the electronic unit is an electronic control unit (40) configured to control an electronic power unit (50), the electronic control unit (40) being fixed to the support (10) by bolting an electrically conductive material so that the 25 clamping electrically connects the electrically conductive track of the electronic control unit (40) to the support (10). 4. An electrical device according to claims 2 and 3, wherein each positioning orifice (42) of the electronic control unit (40) comprises a pad of CFR0973 -PEL15027 - 16 connection (44) made of electrically conductive material, the connection pad (44) being in contact with the positioning member (12) complementary to the support (10), the connection pad (44) being electrically connected to the electrically conductive track of the electronic control unit (40). 5. Electrical device according to one of claims 3 or 4, also comprising an electronic power unit (50), the support (10) supporting the electronic power unit (50), the electronic control unit (40) being electrically connected to the electronic power unit (50), and in which the support (10), the unit 10 power electronics (50) and the electronic control unit (40) each extend in substantially parallel planes and are superimposed on each other in this order. 6. Electrical device according to one of claims 1 or 2, wherein the unit 15 electronics is an electronic power unit (50), the electronic power unit (50) being fixed to the support (10) by bolting of an electrically conductive material so that the bolt electrically connects the electrically conductive track (54) from the electronic power unit (50) to the support (10). 20 7. An electrical device according to claim 6, also comprising an electronic control unit (40) configured to control the electronic power unit (50), the electrically conductive track (54) of the electronic power unit (50) connecting electrically the electronic power unit (50) to the electronic control unit (40), and in which the support (10), the electronic unit 25 of power (50) and the electronic control unit (40) each extend in substantially parallel planes and are superimposed on each other in this order. 8. Electrical device according to one of claims 3 to 5 or 7, wherein the electrically conductive track of the electronic unit is electrically connected to a CFR0973 -PEL15027 - 17 electronic circuit of the electronic control unit (40), in particular an electronic filter. 9. An electrical device according to claim 8, wherein the electronic circuit of the electronic control unit (40) is a common mode filter. 10. Electrical device according to one of the preceding claims, in which the electrically conductive track of the electronic unit is electrically connected to a temperature sensor. 11. Electrical device according to one of claims 3 to 5 or 7 to 10, wherein the support (10) of the electronic power unit (50) is a heat sink, and / or the electronic power unit ( 50) comprises at least one electronic power module, and / or the electronic control unit (40) is an electronic control card. 12. Electrical equipment comprising an electrical machine, and a voltage converter intended to control an electrical energy exchanged between the electrical machine and an electrical power source, said voltage converter comprising an electrical device (30) according to one of claims and in which the voltage converter is mounted on the electric machine. 13. Method for assembling an electrical device (30) according to one of claims 1 to 11, comprising at least the following steps: a step of supplying (S 10) a support (10) and an electronic unit (20), the support (10) being made of electrically conductive material and being electrically connected to a reference potential, the unit electronic (20) being arranged on the support (10) and comprising at least one electrically conductive track, CFR0973-PEL 15027 - 18 a step of bolting (S50, S60) during which the electronic unit (20) is fixed on the support (10) by bolting of an electrically conductive material so that the bolting electrically connects the electrically conductive track of the electronic unit (20) to the support (10). CFR0973 -PEL15027 1/4