FR3143226A1 - Power module for supplying an electrical load of an aircraft, power system and associated method - Google Patents

Abstract

A power module (M) for supplying an electrical load (L) of an aircraft, the power module (M) comprising a plurality of power electronic components (2) mounted on a support substrate (1 ), at least one encapsulation layer (5) of the plurality of power electronic components (2) in order to protect them, at least one power electrical connection (4) connected to at least one power electronic component (2) , at least one fuse protection layer (6) in which extends at least a portion (40) of the electrical power connection (4), the fuse protection layer (6) being configured to change state during the circulation of a current, greater than an admissible threshold, in the portion (40) of the electrical power connection (4) so as to definitively stop the circulation of current in said portion (40). Abstract Figure: Figure 4

Description

Power module for supplying an electrical load of an aircraft, power system and associated method

The present invention relates to the field of protection against electric arcs in a power supply system for at least one electrical load of an aircraft.

As is well known, climate change is a major concern for many legislative and regulatory bodies around the world. Indeed, various restrictions on carbon emissions have been, are or will be adopted by various States. In particular, an ambitious standard applies both to new types of aircraft but also to those in circulation requiring the implementation of technological solutions in order to make them compliant with current regulations. Civil aviation has been mobilizing for several years now to make a contribution to the fight against climate change.

Technological research efforts have already made it possible to very significantly improve the environmental performance of aircraft. The Applicant takes into consideration the impacting factors in all phases of design and development to obtain aeronautical components and products that consume less energy, are more respectful of the environment and whose integration and use in civil aviation have moderate environmental consequences with the aim of improving the energy efficiency of aircraft.

This sustained research and development work relates in particular to new generations of hybrid thermal and electric aircraft engines. The Applicant's objective is in particular to develop aircraft integrating a high-power electrical generation system. This would make it possible to increase the proportion of electrical equipment on board in order to reduce fuel consumption.

In practice, with reference to the a simplified power supply system according to the prior art is shown for powering an electrical load L from a power source S via a power device DP. In practice, the power source S can be an electric battery, a fuel cell or an electric machine capable of operating as a motor and a generator to take mechanical energy from a shaft of the aircraft turbomachine to produce energy. 'electric energy. In practice, a power system includes a plurality of power sources S and a plurality of electrical loads L.

In a known manner, with reference to the , a power device DP comprises one or more power modules M1 to ensure the conversion of electrical energy, for example, inverters. A power module M1 comprises several electronic components controlled so as to ensure the conversion function. Their number depends on the quantity of energy that the M1 power module will have to convert. In practice, the power device DP is configured to receive a PCONS control instruction, for example switch switching orders, which is transmitted to each power module M1 in order to configure the conversion of electrical energy according to the needs.

In reference to the , a power module M1 conventionally comprises a substrate 11 on which electronic power components 12 are mounted, in particular electronic chips. In this example, the electronic power components 12, controlled or not, are connected by electrical connections 14 in order to allow an electrical connection. The electronic power components 12 are protected by an encapsulation layer 15, which provides electrical insulation, and a protective cover 17. The power module M1 comprises at least one power connector 13P configured to interface with a power source S or an electrical load L. The power module M1 also comprises at least one data connector 13D, in order to allow the control of the so-called controllable electronic power components 12. By controllable component we mean a component whose state can be modified under the effect of an electrical signal type command sent to the latter. Power transistors are part of the controllable components. The nature of the signals conveyed by the 13D data connector may vary depending on the nature of the commands and electrical information exchanged with the PCONS control instruction. The structure of such a power module M1 is known to those skilled in the art.

In practice, various faults can appear at any point in the power system: a short circuit occurring in equipment or in wiring, damage to a component subjected to an unforeseen stress, an inoperative component, an electric arc , etc. In order to protect the various pieces of equipment against currents of excessively high values, it is known to provide OPC controllable protection devices to isolate part of the equipment and thus protect them. OPC controllable protection devices generally take the form of electromechanical contactors or so-called static components, using semiconductor components. A controllable protection device OPC makes it possible to isolate the fault, for example, a power source S as illustrated in . In known manner, in the event of detection of a fault in a power source S, the controllable protection members OPC are controlled so as to reconfigure the power system to supply the electrical loads L with the power sources S which are available.

To redundant an OPC controllable protection device, it is often necessary to provide another protection component having a dissimilar breaking technology, for example, a fuse technology.

In reference to the , an OPF fuse type protection device makes it possible to permanently cut an electrical connection. In known manner, such a protection member of the OPF fuse type, for example made of silica, makes it possible to change state in order to absorb an electric arc and cut off the flow of current on the electrical line on which it is mounted. Under the effect of a strong current, the silica will vitrify to cut off the flow of current. Advantageously, an OPF fuse type protection device makes it possible to absorb a large quantity of electrical energy to guarantee the extinction of the electric arc without causing material projection or other damage.

In practice, due to its positioning in series with the equipment to be protected, for example a power source S as illustrated in , the OPF fuse type protection device must be sized to withstand the main current and the transients on the power line connecting the power source S to the power device DP. In the event of a short circuit and a fault in the controllable protection device OPC, the fuse-type protection device OPF will cut off for a high cut-off current. In practice, when the current increases to the cut-off current, the currents circulating in the power module M1 also increase and are likely to damage the electronic power components 12 of the power modules M1. In other words, when the OPF fuse type protection devices cut off the flow of current, the electronic power components 12 of the power modules M1 are likely to already be damaged, which presents a significant disadvantage. Recommissioning is therefore expensive. In addition, OPF fuse type protection devices are bulky, dissipative and cooled by natural air convection. To reduce the risk of overheating, an OPF fuse type protection device is generally oversized. This significantly penalizes the power supply system which must remain compact.

An immediate solution to eliminate this drawback would be to provide OPF fuse protection devices having a lower cut-off current but this would lead to an untimely cut-off in the event of a fluctuation in the current on the power line between the power source S and the DP power device.

The invention thus aims to eliminate at least some of these drawbacks by proposing a fuse protection member making it possible to protect the electronic power components of a power module which are faulty, without increasing the complexity and size.

PRESENTATION OF THE INVENTION

The invention relates to a power module for supplying at least one electrical load of an aircraft, the power module comprising a plurality of power electronic components mounted on a support substrate, at least one encapsulation layer of the plurality of power electronic components in order to protect them, at least one power electrical connection connected to at least one power electronic component.

The invention is remarkable in that the power module comprises at least one fuse protection layer in which at least a portion of the electrical power connection extends, the fuse protection layer being configured to change state when the circulation of a current, greater than an admissible threshold, in the portion of the electrical power connection so as to definitively stop the circulation of current in said portion.

Thanks to the invention, fuse protection is integrated directly into the power module. It makes it possible to permanently stop the flow of current in a portion of an electrical power connection. Furthermore, this fuse protection makes it possible to maintain the power electronic components in an encapsulation layer in order to protect them. The fuse protection layer absorbs the energy released by an electric arc and stops its circulation. Thus, an electric arc is contained locally, which protects the power electronic components. Having fuse protection integrated into the power module is an important advantage because it makes the use of a dedicated fuse type protection device superfluous, which is bulky and complex to install.

According to one aspect, the power electrical connection is connected between two power electronic components.

According to one aspect, the power electrical connection is connected between at least one power electronic component and at least one power electrical connector comprising at least one portion extending outside the encapsulation layer.

According to one aspect, the power electrical connection is partly in the encapsulation layer and partly in the fuse protection layer.

According to one aspect, the power module comprises at least one offset connector connecting the electronic power component to the electrical power connection, the electrical power connection extending only in the fuse protection layer. The fuse protection layer absorbs all the heat linked to the fault. The power electronic components remain protected in the encapsulation layer.

Preferably, the offset connector is positioned on the support substrate.

Preferably, the power module comprises at least one printed circuit board mounted at the interface between the encapsulation layer and the fuse protection layer, the offset connector being connected to the electrical power connection via the circuit board printed. The printed circuit board has the power electrical connections and can be conveniently replaced.

According to one aspect, the power module comprises at least one electrical data connection connected to a data connector, the electrical data connection comprising at least one portion extending into the fuse protection layer. Advantageously, the power electronic components are fully protected.

The invention also relates to a system for powering at least one electrical load of an aircraft comprising at least one power device comprising at least one power module as presented previously.

• Relier au moins une connexion électrique de puissance à un composant électronique de puissance,
• Déposer une couche d’encapsulation sur le composant électronique de puissance de manière à le protéger, et
• Déposer une couche de protection fusible sur au moins une portion de la connexion électrique de puissance, la couche de protection fusible étant configurée pour changer d’état lors de la circulation d’un courant, supérieur à un seuil admissible, dans la portion de la connexion électrique de puissance de manière à stopper de manière définitive la circulation du courant dans ladite portion.

The invention also relates to a method of manufacturing a power module for powering at least one electrical load of an aircraft, the power module comprising a plurality of power electronic components mounted on a support substrate, the method comprising steps consisting of:

• Connect at least one electrical power connection to an electronic power component,
• Place an encapsulation layer on the power electronic component in order to protect it, and
• Deposit a fuse protection layer on at least one portion of the electrical power connection, the fuse protection layer being configured to change state during the circulation of a current, greater than an admissible threshold, in the portion of the electrical power connection so as to definitively stop the circulation of current in said portion.

Preferably, the fuse protection layer is deposited on the encapsulation layer.

According to one aspect, the fuse protection layer is deposited directly on the encapsulation layer, which facilitates assembly.

According to one aspect, the fuse protection layer is deposited indirectly on the encapsulation layer, for example by using an intermediate support. The intermediate support serves as an interface to contain the fuse protection layer. This makes it possible to choose materials constituting the fuse protection layer which would be incompatible with the encapsulation layer. According to one aspect, the intermediate support is a printed circuit board and electrical connections are specifically made on the printed circuit board to ensure the fuse function.

PRESENTATION OF FIGURES

The invention will be better understood on reading the description which follows, given by way of example, and referring to the following figures, given by way of non-limiting examples, in which identical references are given to similar objects .

There is a schematic representation of a power system according to the prior art.

There is a schematic representation of a power module according to the prior art.

There is a schematic representation of a power system according to the invention.

There is a simplified schematic representation of a power system according to the invention.

There is a schematic representation of a power module according to an embodiment according to the invention.

There is a close schematic representation of an electrical connection of the comprising a portion mounted in the fuse protection layer.

There is a close schematic representation of the electrical connection of the after absorption of an electric arc by the fuse protection layer.

There is a schematic representation of a power module according to another embodiment according to the invention.

It should be noted that the figures explain the invention in detail to implement the invention, said figures can of course be used to better define the invention if necessary.

DETAILED DESCRIPTION OF THE INVENTION

In reference to the , a power supply system is shown for powering a plurality of electrical loads L from a plurality of power sources S. A power source S can be in particular in the form of an electric battery, a fuel cell or an electrical machine configured to operate as a motor or as a generator to draw mechanical energy from a shaft of an aircraft turbomachine. The electrical load L can be presented in particular in the form of an actuator or a motor, in particular, comprising two stator stars so as to improve redundancy.

Still with reference to the , the power system comprises a plurality of power devices DP for converting and processing the electrical energy from the power sources S to power the electrical loads L. For example, a power device DP may comprise several modules of power to power the different stator stars of an electric machine.

Still with reference to the , the power supply system comprises a plurality of OPC controllable protection elements, for example contactors, so as to isolate a fault in equipment and allow reconfiguration of the power system for degraded operation.

In a simplified manner, with reference to the , it is represented for the sake of clarity and conciseness a system for supplying a single electrical load L from a single power source S. At the , the power system comprises a power device DP for converting and processing the electrical energy from the power source S to power the electrical load L. A controllable protection device OPC is provided on the power line connecting the power source S to the power device DP.

As illustrated in , the power device DP comprises a plurality of power modules M. Preferably, each power module M is configured to perform at least one conversion function, for example, to process a three-phase current for an inverter of an electrical machine or to supply a distribution current to an electrical load L.

In reference to the , there is shown a power module M according to a first embodiment of the invention. The power module M comprises a plurality of power electronic components 2 mounted on a support substrate 1. In this example, the power electronic components 2 are in the form of electronic chips or semiconductors.

The power module M includes at least one 3P power connector configured to receive power. It is for example configured to be connected to an electrical load L or to a power source S. The 3P power connector is accessible from outside the power module M.

The power module M comprises at least one 3D data connector configured to receive a PCONS control instruction ( ), for example, switching orders for switches or transistors. It is for example configured to be connected to a control computer (not shown). The 3D data connector is accessible from outside the M power module.

In this example, the power electronic components 2 and the 3P, 3D connectors are connected by electrical connections 4, in particular, electrical wires (“wire bonding”) but it goes without saying that other types of connection could be suitable . In reference to the , among the electrical connections 4, we distinguish, on the one hand, 4P power electrical connections which make it possible to circulate high currents, for example greater than 10A, and, on the other hand, 4D electrical data connections which allow low currents to circulate, for example less than 10A.

The power module 4 includes an encapsulation layer 5, covering the plurality of power electronic components 2 in order to protect them. Preferably, the encapsulation layer 5 is made from a silicone-based dielectric gel, a two-component thermosetting dielectric silicone gel or even a layer of Parylene insulation. Such an encapsulation layer 5 is known to those skilled in the art. This encapsulation layer 5 advantageously provides electrical insulation. The 3P, 3D connectors include at least one portion extending outside the encapsulation layer 5.

The invention is remarkable in that the power module M comprises at least one fuse protection layer 6 in which extends at least one portion 40 of an electrical connection 4. In this example, several electrical connections 4 comprise a portion 40 in the fuse protection layer 6, in particular, a 4P power electrical connection connecting a power electronic component 2 to a 3P power connector, a 4P power electrical connection connecting the two power electronic components 2 and an electrical connection 4D data connector connected to the 3D data connector.

The fuse protection layer 6 is configured to change state during the circulation of a current greater than an admissible threshold so as to definitively stop the circulation of currents in the electrical connection portions 40 located in the fuse layer. fuse protection 6.

As illustrated in schematically representing a power electrical connection 4, a portion 40 is located in the fuse protection layer 6. When a fault appears inside or outside the power module DP, a current already present in the portion 40 of the electrical connection 4 will increase, until it exceeds an admissible threshold, preferably at least equal to twice the nominal current passing through the portion 40 of the electrical connection 4 according to a nominal operating mode. In a few microseconds, the portion 40 of the electrical connection 4 will melt, will form a liquid bridge and will end up separating, giving rise to an electric arc.

When the admissible threshold is exceeded, the current circulating in the portion 40 of the electrical connection 4 causes a change of state of the fuse protection layer 6 which becomes a cut-off layer 6', as illustrated in Fig. , which definitively stops the circulation in said portion 40. Currents of excessive values can no longer circulate, which protects the integrity of the power electronic components 2.

This change of state will make it possible to absorb the energy released by the electrical connection 4. When the fuse protection layer 6 returns to the original state (solid state), it is transformed into a layer of cutoff 6' which ensures the definitive interruption of the circulation of current in portion 40 of electrical connection 4.

The power device DP in which the faulty power module M is used then finds itself in a safe state, due to the stopping of the fault and the capacity of the fuse protection layer 6 (cutting layer 6' ) to contain the voltage at the electrical connection 4.

The fuse protection layer 6 is preferably configured to change phase when it changes state, under the effect of the presence of a high heat density. Preferably, the fuse protection layer 6 is thermally and chemically stable and compatible with the encapsulation layer 5. Preferably, the fuse protection layer 6 is configured to provide electrical insulation so as to avoid the propagation of electric currents from the electronic power components 2, even when the fuse protection layer 6 becomes a cutting layer 6'. Preferably, the fusible protective layer 6 is hydrophobic and also allows fire resistance without the release of toxic fumes. Preferably, the fusible protective layer 6 comprises sand, preferably pure silica sand.

In this example, the fuse protection layer 6 is directly in contact with the encapsulation layer 5.

In reference to the , to ensure mechanical protection, the power module is mounted in a housing 7 which preferably comprises a sole 72 connected to the substrate 1 and a cover 71. Preferably, the connectors 3P, 3D extend projecting from the cover 71. In this example, the power module M includes a heatsink 73 to improve heat drainage which is connected to the sole 72, in particular, via a thermal interface layer. According to one aspect of the invention, the encapsulation layer 15 and the box 71 are made in a single element.

An example of implementation of a manufacturing process for a power module M will now be presented. The power electronic components 2 are positioned on the substrate 1, preferably of the SnAg type. Preferably, the substrate 1 has been screen-printed beforehand so as to form a redistribution layer of the electrical connectors and the power electronic components 2 are fixed on the substrate 1 by reflow.

• Relier au moins une connexion électrique 4 à un composant électronique de puissance 2,
• Déposer une couche d’encapsulation 5 sur le composant électronique de puissance 2 de manière à le protéger,
• Stabiliser la couche d’encapsulation 5, par exemple, par une opération d’étuvage, de polymérisation ou autre, et
• Déposer une couche de protection fusible 6 sur au moins une portion 40 de la connexion électrique de puissance 4.

In this example, the method comprises steps consisting of:

• Connect at least one electrical connection 4 to a power electronic component 2,
• Place an encapsulation layer 5 on the power electronic component 2 so as to protect it,
• Stabilize the encapsulation layer 5, for example, by a steaming, polymerization or other operation, and
• Place a fuse protection layer 6 on at least one portion 40 of the electrical power connection 4.

According to one aspect, the method comprises a step consisting of mounting a part of the box 7 before the step consisting of depositing the encapsulation layer 5. This makes it possible to use the volume of the first part of the box to facilitate the deposit of the encapsulation layer 5. Preferably, the method comprises a step consisting of mounting a second part of the housing 7 after the step consisting of depositing the fuse protection layer 6.

Preferably, the encapsulation layer 5 is deposited before the fuse protection layer 6 in order to produce the power module M by deposition of superimposed layers, which is practical.

An example of implementation will be presented with reference to Figures 5 to 7. As illustrated in , the M power module is powered by the 3P power connector which supplies power to two 2 power electronic components via 4P power electrical connections. In this example, a power 2 electronic component is also connected to a 3D data connector via a 4D data electrical connection.

When a short circuit occurs on the power system, the current increases rapidly, especially, in 4P power electrical connections as shown in .

Advantageously, the portion 40 of the electrical power connection 4 makes it possible to change the state of the fuse protection layer 6 which is transformed into a cutoff layer 6'. In this state, the current circulating in the portion 40 of the power electrical connection 4 is stopped definitively as illustrated in the . This advantageously makes it possible to protect the electronic components of power 2 against high currents. Advantageously, the fuse protection layer 6 makes it possible to absorb the energy of the electrical art to protect the power electronic components 2.

Preferably, when the fuse protection layer 6 changes state, the current is stopped in all of the portions 40, that is to say, even in those which have not circulated a current greater than the admissible threshold. This is particularly the case for the 4D control electrical connection in which no high current flows.

The power 2 electronic components are thus protected. It is sufficient for an operator to replace the fuse protection layer 6 and the electrical connections 4P, 4D to put the power module M back into service, which is advantageous.

Another embodiment is shown in . For the sake of clarity and conciseness, only the differences with the first embodiment of the . Common or similar elements bear the same references on the and will not be described again.

In reference to the , the power module M comprises a printed circuit board 8, called "PCB", arranged between the encapsulation layer 5 and the fuse protection layer 6. Advantageously, this allows the electrical connections to promote return to service by creating a boundary between the encapsulation layer 5 and the fuse protection layer 6. In addition, this allows you to benefit from great freedom in choosing the materials for the encapsulation layer 5 and the fuse protection layer 6 being since they are not in direct contact. This also makes it easier to return to service.

In this example, the power module M comprises several offset members 9, housed in the encapsulation layer 5, which are connected on the one hand to an electronic power component 2 and on the other hand, to the circuit card printed 8. The power electrical connection 4 is connected only to the printed circuit board 8 and extends into the fuse protection layer 6, in particular, only in the latter.

Thus, following the appearance of an electric arc, the power electrical connections 4 can be removed in a practical manner with the fuse protection layer 6. When returning to service, it is sufficient to recreate the power electrical connections 4 and to deposit a new fuse protection layer 6. The encapsulation layer 5, the electronic power components 2 and the offset members 9 are advantageously not affected. Preferably, the power electrical connections 4 are pre-wired on the printed circuit board 8, which facilitates assembly and recommissioning.

Preferably, each offset member 9 is in the form of a vertical pillar mounted on the substrate 1. Preferably, each offset member 9 is connected to an electronic power component 2 via an internal electrical connection 4a which extends, preferably, only in the encapsulation layer 5 as illustrated in .

• une partie interne 31P, logée dans la couche d’encapsulation 5, qui est montée d’une part sur le substrat 1 et reliée d’autre part, à la carte de circuit imprimé 8,
• une partie externe 32P, logée en partie dans la couche de protection fusible 6 et
• une liaison externe 33P reliant électriquement la partie externe 32P à la partie interne 31P via la carte de circuit imprimé 8.

In this example, with reference to the , the 3P power connector includes:

• an internal part 31P, housed in the encapsulation layer 5, which is mounted on the one hand on the substrate 1 and connected on the other hand, to the printed circuit board 8,
• an external part 32P, housed partly in the fuse protection layer 6 and
• an external connection 33P electrically connecting the external part 32P to the internal part 31P via the printed circuit board 8.

Analogously, the external connection 33P extends only in the fuse protection layer 6. The fuse protection layer 6 is configured to change state during the circulation of a current, greater than an admissible threshold, in the external connection 33P so as to definitively stop the flow of current in the external connection 33P. Thus, advantageously, the fuse protection layer 6 can change state upon the appearance of an electric arc in the 3P power connector.

An example of implementation of a manufacturing process for a power module M will now be presented. The power electronic components 2 are positioned on the substrate 1. Preferably, the substrate 1 has been previously screen printed so as to form a redistribution layer of the electrical connectors and the power electronic components 2 are fixed on the substrate 1 by reflow with the offset members 9 and the internal electrical connections 4a. Preferably, the internal part 31P of the 3P power connector is also positioned on the substrate 1.

The method includes a step consisting of depositing an encapsulation layer on the elements positioned on the substrate 1 in order to protect them and form a first assembly.

Then, the method includes a step consisting of assembling the printed circuit board 8 on the first assembly. The electrical connections 4, the external link 33P and the external part 32P of the 3P power connector are preferably pre-wired. The assembly can be carried out by brazing but also, preferably, by a “press-fit” assembly operation. Compatible offset members 9 are chosen in the event of press assembly. After assembly, the process includes a step consisting of depositing the fuse protection layer 6. Such a manufacturing process makes it possible to offer great flexibility in the choice of the material of the encapsulation layer 5 and the fuse protection layer 6. since they are not in direct contact.

Thanks to the invention, a current cut-off is carried out locally in a power module M for lower cut-off currents than in the prior art. This protects the power 2 electronic components and facilitates recommissioning. The power of an electric arc is absorbed locally by the fuse protection layer 6. This limits material projections and the spread of damage.

Claims (9)

Power module (M) for powering at least one electrical load (L) of an aircraft, the power module (M) comprising a plurality of power electronic components (2) mounted on a support substrate ( 1), at least one encapsulation layer (5) of the plurality of power electronic components (2) in order to protect them, at least one power electrical connection (4) connected to at least one power electronic component (2 ), power module (M) characterized in that it comprises at least one fuse protection layer (6) in which extends at least one portion (40) of the electrical power connection (4), the layer fuse protection (6) being configured to change state during the circulation of a current, greater than an admissible threshold, in the portion (40) of the electrical power connection (4) so as to stop definitively the circulation of current in said portion (40). Power module (M) according to claim 1, in which the electrical power connection (4) is connected between two power electronic components (2). Power module (M) according to one of claims 1 to 2, in which the power electrical connection (4) is connected between at least one power electronic component (2) and at least one power electrical connector (3P ) comprising at least one portion extending outside the encapsulation layer (5). Power module (M) according to one of claims 1 to 3, comprising at least one offset connector (9) connecting the electronic power component (2) to the electrical power connection (4), the electrical power connection (4) extending only into the fuse protection layer (6). Power module (M) according to claim 4, comprising at least one printed circuit board (8) mounted at the interface between the encapsulation layer and the fuse protection layer (6), the offset connector (9) being connected to the power electrical connection (4) via the printed circuit board (8). Power module (M) according to one of claims 1 to 5, comprising at least one electrical data connection (4D) connected to a data connector (3D), the electrical data connection (4D) comprising at least one portion (40) extending into the fuse protection layer (6). Power module (M) according to one of claims 1 to 6, the electrical power connection (4) of which is in the form of a longitudinal wire which comprises several parts (41, 42) having different sections. Power supply system for an aircraft electrical network (REA) comprising at least one power device (DP) comprising at least one power module (M) according to one of claims 1 to 7. Method for manufacturing a power module (M) for supplying at least one electrical load (L) of an aircraft, the power module (M) comprising a plurality of mounted power electronic components (2) on a support substrate (1), the method comprising steps consisting of:

• Connect at least one electrical power connection (4) to an electronic power component (2),
• Deposit an encapsulation layer (5) on the power electronic component (2) so as to protect it, and
• Deposit a fuse protection layer (6) on at least one portion (40) of the electrical power connection (4), the fuse protection layer (6) being configured to change state during the circulation of a current , greater than an admissible threshold, in the portion (40) of the electrical power connection (4) so as to definitively stop the circulation of current in said portion (40).