WO2023073298A1 - Dispositif d'alimentation électrique à protection thermique - Google Patents
Dispositif d'alimentation électrique à protection thermique Download PDFInfo
- Publication number
- WO2023073298A1 WO2023073298A1 PCT/FR2022/051937 FR2022051937W WO2023073298A1 WO 2023073298 A1 WO2023073298 A1 WO 2023073298A1 FR 2022051937 W FR2022051937 W FR 2022051937W WO 2023073298 A1 WO2023073298 A1 WO 2023073298A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- power
- power supply
- supply device
- sensitive element
- thermally sensitive
- Prior art date
Links
- 239000000155 melt Substances 0.000 claims abstract description 7
- 230000014759 maintenance of location Effects 0.000 claims description 4
- 239000000919 ceramic Substances 0.000 claims description 3
- 229910001092 metal group alloy Inorganic materials 0.000 claims description 3
- 239000012188 paraffin wax Substances 0.000 claims description 3
- 239000001993 wax Substances 0.000 claims description 3
- 238000002844 melting Methods 0.000 description 10
- 230000008018 melting Effects 0.000 description 10
- 239000000463 material Substances 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000008542 thermal sensitivity Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H37/00—Thermally-actuated switches
- H01H37/74—Switches in which only the opening movement or only the closing movement of a contact is effected by heating or cooling
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H37/00—Thermally-actuated switches
- H01H37/74—Switches in which only the opening movement or only the closing movement of a contact is effected by heating or cooling
- H01H37/76—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material
- H01H37/764—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material in which contacts are held closed by a thermal pellet
Definitions
- TITLE Thermally protected power supply device
- the technical field of the invention is electrical protection devices, and more particularly, such thermal tripping devices.
- the transport of high electrical powers is generally carried out by means of a power bar.
- a thermal fuse is usually installed in the busbar so as to introduce a point of weakness. Indeed, it is made of materials more sensitive to a rise in temperature than the power bar so as to melt and interrupt electrical conduction in the event of circulation of too high a power.
- thermo fuse An alternative to such a thermal fuse is a bimetallic switch, one of the blades of which deforms under an increase in heat, effectively separating the two blades and interrupting the flow of electrical power.
- thermal device whatever thermal device is chosen, it constitutes an independent component which must be interposed on the power bar. This implies additional interfaces and parts in the electrical chain, associated with a large integration volume, and additional electrical resistance.
- the subject of the invention is an electrical power supply device comprising:
- thermally sensitive element configured to melt at a predefined temperature
- the elastic element being configured to move the two power bars away from each other and break the electrical contact, when the thermally sensitive element melts.
- the elastic element can be arranged in a cavity.
- the cavity can be formed by a perforated plate attached to a power bar or by recessing part of a power bar.
- the elastic element can be at least a spring washer, a coil spring or a wave spring.
- the power bar can be a braid or have a multi-band structure or a high aspect ratio length/section.
- the elastic element can be included in a power bar, in particular in the form of a prestress.
- the thermally sensitive element can be wax, paraffin or metal alloy.
- the holding system can be a threaded rod fitted with at least two bolts.
- the holding system may comprise an insulated barrel in each power bar, the barrels being arranged so that the threaded rod can be introduced simultaneously into the two barrels.
- the holding system can be made of high temperature resistant plastic or ceramic.
- the holding system may include the thermally sensitive element such that it breaks when the temperature exceeds the predefined temperature.
- the power supply device may include a retention basin configured to retain the thermally sensitive element after it has melted.
- the thermally sensitive element can be arranged under the power bars so as not to form a thermal or electrical bridge during its melting.
- Another object of the invention is an aircraft comprising an electrical power supply device as described above.
- Such a power supply device has the advantage of limiting the propagation of heat in the event of thermal runaway of the system to be powered.
- FIG. 1 illustrates the main elements of a power supply device according to the invention
- FIG. 2 illustrates the main elements of a power supply device in its normal layout
- FIG. 3 illustrates the main elements of a power supply device in its layout after a thermal incident
- FIG. 4 illustrates the main elements of an alternative embodiment of a power supply device according to the invention.
- the power bars are usually made of aluminum or copper and constitute an electrical connection of power. In particular, they connect the input/output connectors to the internal elements of equipment.
- the power supply device makes it possible to electrically connect two power bars.
- the power supply device comprises a holding system, an elastic element and a thermally sensitive element which is used to put the power bars in electrical contact.
- the thermally sensitive element melts or softens, which allows the power bars to be moved apart, under the action of the elastic element. The electrical and thermal contact between the two power bars is then broken.
- FIG. 1 illustrates an electrical power supply device referenced 1 comprising a first power bar 2 connected to an electrical system to be powered, not shown in the figure, and a second power bar 3 connected to a power source also not shown in the figure. figure.
- the second power bar 3 comprises a cavity 4 in which an elastic element (not shown) is placed.
- the cavity 4 results from the fixing of a perforated plate 5 on one or the other of the power bars 2,3.
- the elastic element is arranged in the cavity 4 so as to separate the two power bars 2.3.
- the elastic element can be a belleville washer or a stack of such washers.
- a thermally sensitive element referenced 6 is arranged on the second power bar 3. This element is chosen to melt at a predefined temperature, lower than a predefined temperature, in particular the temperature of damage to the power bars 2.3 or to the electrical system to feed.
- the two power bars 2.3, the elastic element and the thermally sensitive element 6 are held in contact by a holding system 7,8,9 such as a threaded rod 7 fitted with bolts 8.9.
- a holding system 7,8,9 such as a threaded rod 7 fitted with bolts 8.9.
- Other holding systems could be envisaged since they make it possible to oppose the force of the elastic element by means of the thermally sensitive element 6, without opposing the spacing of the power bars 2.3 once the thermally sensitive element 6 melted.
- the holding system 7,8,9 is insulating so as not to constitute a point of electrical conduction after melting of the thermally sensitive element 6.
- the isolation can be obtained by using insulating guns inserted in each of the power bars 2.3 and arranged so that a threaded rod can be inserted simultaneously into the two barrels. Insulation can also be obtained by using insulating washers between each bolt 8.9 and the power bars 2.3.
- the elastic element is also electrically insulating, or associated with an electrical insulation making it possible to isolate it from at least one of the power bars 2.3.
- the second power bar 3 is separated from the first power bar 2 without the position of the nuts 8.9 being modified.
- this first embodiment is limited by the flexibility of the second power bar 3 in relation to the force that can be exerted by an electrically insulating elastic element.
- the two 2.3 power bars must be separated by a distance greater than the distance from which an electric arc can form for the electrical power applied. For example, to interrupt the flow of a current under 200V, a gap of at least 3mm is necessary.
- all or part of the second power bar 3 is replaced by a conductive braid with greater flexibility or by a set of superimposed thin strips, giving flexibility to the whole.
- the 7,8,9 holding system is made of high temperature resistant plastic or ceramic.
- the elastic element 13 is metallic and associated with an insulating element, not shown, in particular made of plastic or ceramic material.
- the elastic element 13 is at least a spring washer, a coil spring, or a wave spring.
- the elastic element 13 is made of high temperature resistant plastic material.
- the power supply device is arranged between the firewall fabric 10 and the casing 11 of a system to be powered (not shown) connected to the first power bar 2.
- the second power bar 3 is connected to the power source arranged outside the casing 11 via a fitting 12.
- the arrow illustrates that this second power bar 3 is designed so as to be able to be moved away from the first power bar 2 when the temperature-sensitive element 6 melts or softens.
- Figure 2 illustrates the power supply device in its normal arrangement, that is to say when the temperature of the power bars 2.3 is lower than the melting or creep temperature of the thermally sensitive element 6.
- the power supply device is then electrically conducting.
- FIG. 3 illustrates the power supply device in its disposition after a thermal incident, that is to say when the temperature of the power bars 2.3 is higher than the melting or creep temperature of the thermally sensitive element 6.
- Figure 3 is illustrated a spacing of the power bars 2.3 due to the extension of the elastic element 13 made possible by the melting of the thermally sensitive element 6.
- the power supply device is then more electrically conducting.
- the thermally sensitive element 6 is arranged above the power bars 2.3. Nevertheless, to avoid a thermal or electrical bridge due to the melting of the material of the thermally sensitive element 6, a retention tank 14 is provided between said thermally sensitive element 6 and the power bars 2.3. This retention tank 14 is adapted to contain the material of the thermally sensitive element 6 while being chemically and thermally resistant.
- the thermally sensitive element melts at a temperature comprised in a predefined interval between 70°C and 100°C (this range of temperatures corresponds to a temperature above which the thermal runaway of the cells is unavoidable and higher than the ambient temperatures encountered in normal use and storage).
- the first power bar 2 connected to the system to be powered is capable of transporting a thermal flux due to an electrical malfunction of the system to be powered.
- the first power bar is shorter than the second power bar, so that the power supply device is more quickly exposed to the heat flow.
- the thermally sensitive element 6 is preferably a metal alloy with a known, chosen and controlled melting temperature. Alternatively, it can be paraffin, a wax or a temperature sensitive plastic so as to soften within a predetermined temperature range.
- the power bar can be changed to improve deflection. To do this, it can be flexible, in particular by being made with a fine multi-band structure. Alternatively, the power bar is made as a metal braid. Finally, it may have a significant length so as to increase the deflection.
- the power bar can be designed so as to be prestressed in its rest position.
- the power bar may undergo plastic deformation prior to its installation in the power supply device. The contacting of the power bars by the holding system 7,8,9 through the thermally substantially element 6 makes it possible to oppose this deformation in the rest position of the power bar.
- the melting of the thermally substantially substantially element 6 makes it possible both to create a space towards which the prestressed power bar can move, and to reduce the force applied by the holding system opposing the deformation. This then causes the power bar to move towards its rest position.
- the holding system 7,8,9 comprises the thermally sensitive element 6 so that at least part of the holding system 7,8,9 is capable of melting when it is subjected to a temperature higher than the preset temperature. In such a system, it is not necessary to have a separate thermally sensitive element 6.
- the power supply device has visual access to the cavity 4, making it possible to ensure the correct assembly of the elastic element 13.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Fuses (AREA)
- Thermally Actuated Switches (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP22801515.2A EP4423785A1 (fr) | 2021-10-29 | 2022-10-14 | Dispositif d'alimentation électrique à protection thermique |
CN202280071732.2A CN118160061A (zh) | 2021-10-29 | 2022-10-14 | 带热保护的供电装置 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR2111536A FR3128817B1 (fr) | 2021-10-29 | 2021-10-29 | Dispositif d’alimentation électrique à protection thermique |
FRFR2111536 | 2021-10-29 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2023073298A1 true WO2023073298A1 (fr) | 2023-05-04 |
Family
ID=79601481
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2022/051937 WO2023073298A1 (fr) | 2021-10-29 | 2022-10-14 | Dispositif d'alimentation électrique à protection thermique |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP4423785A1 (fr) |
CN (1) | CN118160061A (fr) |
FR (1) | FR3128817B1 (fr) |
WO (1) | WO2023073298A1 (fr) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0285044A2 (fr) * | 1987-04-02 | 1988-10-05 | Fritz Pscherer Nachf. Gmbh | Fusible thermique pour appareils électriques |
US6855008B1 (en) * | 2003-10-06 | 2005-02-15 | Royal Die & Stamping Co., Inc. | Fuse holder with adjustable terminals |
DE102015111885A1 (de) * | 2015-07-22 | 2017-01-26 | Kromberg & Schubert Gmbh | Sicherung für Stromverteiler |
US9666399B1 (en) * | 2016-05-25 | 2017-05-30 | Green Idea Tech Inc. | Metal and plastic safety clip to protect against overheating in a plug or socket |
-
2021
- 2021-10-29 FR FR2111536A patent/FR3128817B1/fr active Active
-
2022
- 2022-10-14 WO PCT/FR2022/051937 patent/WO2023073298A1/fr active Application Filing
- 2022-10-14 CN CN202280071732.2A patent/CN118160061A/zh active Pending
- 2022-10-14 EP EP22801515.2A patent/EP4423785A1/fr active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0285044A2 (fr) * | 1987-04-02 | 1988-10-05 | Fritz Pscherer Nachf. Gmbh | Fusible thermique pour appareils électriques |
US6855008B1 (en) * | 2003-10-06 | 2005-02-15 | Royal Die & Stamping Co., Inc. | Fuse holder with adjustable terminals |
DE102015111885A1 (de) * | 2015-07-22 | 2017-01-26 | Kromberg & Schubert Gmbh | Sicherung für Stromverteiler |
US9666399B1 (en) * | 2016-05-25 | 2017-05-30 | Green Idea Tech Inc. | Metal and plastic safety clip to protect against overheating in a plug or socket |
Also Published As
Publication number | Publication date |
---|---|
CN118160061A (zh) | 2024-06-07 |
FR3128817B1 (fr) | 2024-03-29 |
EP4423785A1 (fr) | 2024-09-04 |
FR3128817A1 (fr) | 2023-05-05 |
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