EP1498927B1 - Dispositif de protection à courant de haute intensité - Google Patents

Dispositif de protection à courant de haute intensité Download PDF

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Publication number
EP1498927B1
EP1498927B1 EP03425466A EP03425466A EP1498927B1 EP 1498927 B1 EP1498927 B1 EP 1498927B1 EP 03425466 A EP03425466 A EP 03425466A EP 03425466 A EP03425466 A EP 03425466A EP 1498927 B1 EP1498927 B1 EP 1498927B1
Authority
EP
European Patent Office
Prior art keywords
fuse
conductive
plate
protection device
output
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP03425466A
Other languages
German (de)
English (en)
Other versions
EP1498927A1 (fr
Inventor
Antonio Falchetti
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
MTA SpA
Original Assignee
MTA SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by MTA SpA filed Critical MTA SpA
Priority to DE60302564T priority Critical patent/DE60302564T2/de
Priority to AT03425466T priority patent/ATE311663T1/de
Priority to EP03425466A priority patent/EP1498927B1/fr
Publication of EP1498927A1 publication Critical patent/EP1498927A1/fr
Application granted granted Critical
Publication of EP1498927B1 publication Critical patent/EP1498927B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02—Details
    • H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
    • H01H85/041—Fuses, i.e. expendable parts of the protective device, e.g. cartridges characterised by the type
    • H01H85/044—General constructions or structure of low voltage fuses, i.e. below 1000 V, or of fuses where the applicable voltage is not specified
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02—Details
    • H01H85/0241—Structural association of a fuse and another component or apparatus
    • H01H2085/025—Structural association with a binding post of a storage battery
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02—Details
    • H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
    • H01H85/05—Component parts thereof
    • H01H85/055—Fusible members
    • H01H2085/0555—Input terminal connected to a plurality of output terminals, e.g. multielectrode
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02—Details
    • H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
    • H01H85/05—Component parts thereof
    • H01H85/055—Fusible members
    • H01H85/06—Fusible members characterised by the fusible material

Definitions

  • the present invention relates to a high-current protection device according to the preamble to Claim 1.
  • the present invention relates to an improved high-current protection device for use in the automotive industry.
  • high current used herein relates to currents greater than or equal to 40 A.
  • motor cars are provided with fuses for protecting the supply lines of the electrical user devices.
  • fuses for protecting the supply lines of the electrical user devices.
  • the use of power fuses has been introduced to protect the primary users such as, for example, ABS device, air-conditioning, plugs for diesel engines, alternator, electronic injection, radiator fans, automatic gearbox, electronic control units, petrol pump, etc...
  • the power fuses that are used mostly are those having nominal currents of between 20 and 100 A, although it may sometimes be necessary to use power fuses having higher nominal currents, for example, of the order of 400 A.
  • Document EP 1 075 012 discloses a device according to the preamble of claim 1.
  • This protection device comprises an input conductive portion which is connected electrically to a plurality of output conductive portions by means of respective fuse elements so as to form a single conductive plate which is produced in a single piece from a conductive-metal plate.
  • the conductive plate is housed inside a protective housing or a fuse-holder box, both to prevent dangerous leakages of molten material and to ensure suitable thermal insulation.
  • the most important primary electrical user is generally the alternator which has to be protected by power fuses having nominal currents of up to 400 A.
  • the other primary electrical users are protected by medium-power fuse elements to which nominal current values of between 40 and 80 A are attributed, that is approximately one order of magnitude less than the nominal current value of the power fuse.
  • the object of the present invention is to provide a high-current protection device having structural and functional characteristics such as to satisfy the above-mentioned needs and at the same time to prevent the problems mentioned with reference to the prior art.
  • a high-current protection device according to the present invention is generally indicated 1.
  • the protection device 1 comprises a protective casing 2, preferably made of plastics material, and a metal conductive plate 5 made of conductive material.
  • the protective casing is formed by a support base 3 and by a cover 4, partially associated therewith.
  • a slot 9 is formed along one side of the support base 3 to constitute a seat for the insertion of a portion of the metal conductive plate 5.
  • the conductive plate 5 comprises an input conductive portion 6 and an output conductive portion 7.
  • the input conductive portion 6 has a first, substantially rectangular conductive portion 6a connected, by means of a connecting portion 6b, to a second, substantially square conductive portion 6c.
  • the output conductive portion 7 is connected electrically to the input conductive portion 6 by means of a fuse portion 8 having a cross-section of reduced width.
  • the fuse portion 8 is connected to the connecting portion 6b.
  • the fuse portion 8 constitutes the power fuse element of the device 1 of the present invention which is heated until it melts as a result of the circulation of currents of predetermined intensity.
  • the electrical continuity between the input conductive portion 6 and the output conductive portion 7 is consequently interrupted.
  • the width of the fuse portion 8 is calibrated in dependence on the nominal current attributed to the power fuse element.
  • the nominal current of the fuse portion 8 is between 300 and 400 A.
  • the width L of the fuse portion 8 is between 1,6 mm and 2,0 mm for currents having nominal values within the range between 300 and 400 A. In the embodiment described the width L is 1,8 mm.
  • the conductive plate 5 may advantageously be formed in a single piece by blanking from a plate of metal suitable for the production of power fuses with high nominal currents, for example, copper (Cu) or copper covered with a layer of tin (Sn).
  • a plate of metal suitable for the production of power fuses with high nominal currents for example, copper (Cu) or copper covered with a layer of tin (Sn).
  • the overall thickness of the conductive plate 5 is 1,2 mm.
  • the conductive plate 5 is shaped by means of bending and subsequent trimming operations to adopt the shape shown in Figure 5.
  • Figure 6 shows the flat blank of the conductive plate 5 before the bending and trimming operations are performed.
  • the plate 5 is -advantageously provided with a stiffening bridge 10 which connects the output portion 7 and the second portion 6c of the input portion 6.
  • the plate 5 is bent in the vicinity of the bend lines X-X and X'-X' so that the output conductive portion 7, together with the fuse portion 8 and the second conductive portion 6c, are substantially at right angles to the first conductive portion 6a.
  • the bridge 10 stiffens the structure, enabling the bending operation to be performed without the risk of causing bending or even breakage of the fuse portion 8.
  • the bridge 10 is then removed by a simple trimming operation and the conductive plate 5 is fitted in the base 3 by the insertion of the first portion 6a in the slot 9.
  • the conductive plate 5 is advantageously provided with a retaining tooth 30 for snap-engaging a portion of the side of the base 3 in which the slot 9 is formed. This prevents the conductive plate 5 from accidentally being displaced from its seat, when it is correctly housed in the base 3, for example, as a result of a thrust exerted on the first portion 6a.
  • connection means of the input portion 6 comprise a pair of openings, generally indicated 11, each of which is arranged to be associated with means (not shown in the drawings) for clamping to a terminal of a battery 12.
  • connection means of the output portion 7 comprise an opening 14 suitable for receiving a screw 25 and a respective nut (not shown in the drawings) for the fixing of an electrical terminal of a supply cable coming, for example, from the alternator and from the starter motor.
  • the protection device 1 comprises fuse means which are fixed to the conductive plate 5 and are in electrical communication therewith.
  • the fuse means are made of a second conductive material having an electrical conductivity lower than the electrical conductivity of the conductive material of the conductive plate 5.
  • the fuse means preferably comprise a fuse plate 15 formed in a single piece by blanking from a plate of metal suitable for the production of power fuses with nominal fusing currents of between 40 and 80 A, for example, zinc (Zn) or tinned zinc.
  • the overall thickness of the conductive plate 5 is 1,2 mm.
  • the fuse plate 15 has an input portion 16, an output portion, and a fuse portion suitable for connecting the input portion 16 and output portion to one another electrically.
  • the two fuse portions 17 and 18 are in parallel with one another and protect two distinct medium-power primary users.
  • the fuse portions 17, 18 are S-shaped but may also be formed with a different composite-line shape.
  • the fuse plate 15 advantageously has means for fixing to the conductive plate 5 and means for connection to an electrical terminal (not shown in the drawings).
  • the means for connection to the electrical terminal comprise an electrical connector 26 to be coupled with a complementary electrical connector (not shown in the drawings).
  • each of the output portions 19, 20 of the fuse plate 15 is shaped so as to form, at one of its ends, a male electrical connector 26 to be coupled with a complementary female electrical connector.
  • each electrical connector 26 the support base 3 of plastics material has a tubular protector 27 which extends from the cover 4 and has a front opening 28 for the insertion of the electrical connector 26 which extends inside the tubular protector 27.
  • the complementary electrical connector will be housed in a tubular protector (not shown in the drawings) suitable for achieving a form fit with the tubular protector 27.
  • the tubular protector 27 is provided with engagement means 29 suitable for snap-engaging corresponding engagement means of the tubular protector of the complementary electrical connector.
  • the means for fixing to the conductive plate 5 comprise a circular opening 22 which is formed in the input portion 16 of the fuse plate 15 and which is provided for the insertion of the shank of a screw 23 which is in engagement with a corresponding opening formed in the conductive plate 5.
  • a nut 24 in threaded engagement with the screw 23 secures the fuse plate 15 to the conductive plate 5.
  • the head of the screw 23 is advantageously housed in a seat in the plastics base 3, which prevents its rotation.
  • the nut 24 for the fixing of the fuse plate 15 and the nut for the clamping of the terminal of the cable coming from the alternator are preferably made of a material with a high thermal-expansion coefficient, for example, steel.
  • the clamping force of the nut on the respective screw thus increases as the temperature rises.
  • the nominal fusing current of the fuse portion 17 is advantageously different from the nominal fusing current of the fuse portion 18. It is thus possible to protect primary users with different nominal fusing currents.
  • the nominal fusing current of each of the fuse portions 17 and 18 of the fuse plate 15 is preferably within the range of between 40 and 80 A.
  • the width l 1 of the fuse portion 17 and the width l 2 of the fuse portion 18 are between 1,2 and 2,2 mm for currents having nominal values within this range.
  • the nominal fusing current of the fuse portion 17 is 70 A, which corresponds to a width l 1 of about 2,0 mm
  • the nominal current of the fuse portion 18 is 60 A, which corresponds to a width l 2 of about 1,55 mm.
  • the fuse plate 15 is fixed to the input portion 6 of the conductive plate 5, in particular to the second conductive portion 6c.
  • the second conductive portion 6c has an opening 21 for receiving the shank of the screw 23 extending through the opening 22 formed in the fuse plate 15 so as to enable it to be clamped by means of the nut 24.
  • melting of the fuse portion 8 brings about interruption of the supply from the alternator to the input conductive portion 6, that is, to the users that are connected thereto by means of the fuse plate 15, and interruption of the supply from the battery to the starter motor.
  • the users that are connected to the output portions 17 and 18 are, for example, the central electrical unit of the engine and the electric power-steering device.
  • the fuse plate 15 is fixed to the output portion 7 of the conductive plate 5.
  • the output portion 7 is provided with an opening 13 for receiving the shank of the screw 23 extending through the opening 22 formed in the fuse plate 15 so as to enable it to be clamped by means of the nut 24.
  • the fuse plate 15 is thus disposed downstream of the power fuse element 8, with respect to the terminal for connection to the battery 12.
  • the fuse plate 15 when the fuse plate 15 is fixed to the output conductive portion 7 of the conductive plate 5, its fuse portions 17 and 18 are in series with the power fuse element 8.
  • melting of the fuse portion 8 brings about interruption of the supply from the battery 12 to the output conductive portion 7.
  • the supply to the starter motor and to the electrical users that are connected to the output conductive portion 7 by means of the fuse plate 15 is consequently interrupted.
  • the users that are connected to the output portions 17 and 18 of the fuse plate are, for example, the medium-low power fuse-holder box and the central electrical unit of the engine.
  • the fuse means comprise first fuse means fixed to the output portion 7 and second fuse means fixed to the input portion 6, particularly to the second portion 6c.
  • the first and second fuse means take the form of two fuse plates 15 fixed to the output portion 7 and to the input portion 6, respectively.
  • the fuse plate 15 which is fixed to the output conductive portion 7, downstream of the power fuse element 8 with respect to the terminal for connection to the battery 12, is in parallel with the fuse plate 15 which is fixed to the input conductive portion 6.
  • the two fuse plates 15 may differ from one another both in terms of the number of output terminals and in terms of the nominal fusing currents of the fuse portions 17, 18. There may also be more than two fuse plates 15 and there may be different numbers of fuse plates 15 for the input portion 6 and for the output portion 7.
  • melting of the fuse portion 8 brings about interruption of the supply from the battery 12 to the output conductive portion 7 and from the alternator to the input conductive portion 6.
  • the above-mentioned electrical users have been given purely by way of indication and can be selected from the group comprising ABS device, air-conditioning, plugs for diesel engines, alternator, electronic injection, radiator fans, automatic gearbox, electronic control units, petrol pump, etc.
  • the power fuse can be used as a selective element in the event of its melting.
  • the high-current protection device satisfies the needs and overcomes the problems mentioned with reference to the prior art in the introductory portion of this description.
  • An advantage resulting from the use of the present invention is that it is possible to provide a protection device having fuse elements with associated nominal currents which differ from one another by one order of magnitude.
  • the protection device of the present invention also performs a selective function in the event of melting of the power fuse element, interrupting the supply to some electrical users whilst maintaining the supply from the battery to other electrical users which can be selected in dependence on the requirements of the user of the device.

Landscapes

  • Fuses (AREA)
  • Emergency Protection Circuit Devices (AREA)

Claims (10)

  1. Dispositif de protection à courant de haute intensité (1) comprenant une partie conductrice d'entrée (6), une partie conductrice de sortie (7) et une partie de fusible (8) connectant la partie conductrice d'entrée (6) et la partie conductrice de sortie (7) l'une à l'autre électriquement, dans lequel la partie conductrice d'entrée (6), la partie conductrice de sortie (7) et la partie de fusible (8) forment une unique plaque conductrice (5) constituée par un premier matériau conducteur et formées d'une seule pièce, caractérisé en ce que le dispositif comprend des moyens de fusible (15), constitués par un deuxième matériau conducteur, qui sont fixés à la plaque conductrice (5) et sont en communication électrique avec celle-ci, dans lequel le premier matériau conducteur a une conductivité électrique supérieure à la conductivité électrique du deuxième matériau conducteur.
  2. Dispositif de protection à courant de haute intensité (1) selon la revendication 1, dans lequel les moyens de fusible (15) sont fixés à la partie conductrice d'entrée (6) de la plaque conductrice (5).
  3. Dispositif de protection à courant de haute intensité (1) selon la revendication 1, dans lequel les moyens de fusible (15) sont fixés à la partie conductrice de sortie (7) de la plaque conductrice (5).
  4. Dispositif de protection à courant de haute intensité (1) selon la revendication 1, dans lequel les moyens de fusible (15) comprennent un premier moyen de fusible fixé à la partie conductrice de sortie (7) de la plaque conductrice (5) et un deuxième moyen de fusible fixé à la partie conductrice d'entrée (6) de la plaque conductrice (5).
  5. Dispositif de protection à courant de haute intensité (1) selon l'une quelconque des revendications 1 à 4, dans lequel les moyens de fusible (15) comprennent au moins une plaque de fusible (15) formée d'une seule pièce et ayant une partie d'entrée (16) et au moins une partie de sortie (19, 20) et une partie de fusible correspondante (17, 18) adaptée pour connecter la partie d'entrée (16) et la partie de sortie (19, 20) l'une à l'autre électriquement.
  6. Dispositif de protection à courant de haute intensité (1) selon la revendication 5, dans lequel la partie d'entrée (16) de la au moins une plaque de fusible (15) comprend des moyens (22) pour la fixation à la plaque conductrice (5).
  7. Dispositif de protection à courant de haute intensité (1) selon la revendication 5 ou 6, dans lequel la partie de sortie (19, 20) de la plaque de fusible (15) comprend des moyens (26) pour la connexion à une borne électrique.
  8. Dispositif de protection à courant de haute intensité (1) selon l'une quelconque des revendications 1 à 7, dans lequel la partie conductrice de sortie (7) comprend des moyens (14) pour la connexion à une borne électrique.
  9. Dispositif de protection à courant de haute intensité (1) selon l'une quelconque des revendications 1 à 8, dans lequel le premier matériau conducteur est le cuivre.
  10. Dispositif de protection à courant de haute intensité (1) selon l'une quelconque des revendications 1 à 9, dans lequel le deuxième matériau conducteur est le zinc.
EP03425466A 2003-07-14 2003-07-14 Dispositif de protection à courant de haute intensité Expired - Lifetime EP1498927B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE60302564T DE60302564T2 (de) 2003-07-14 2003-07-14 Hochstromschutzvorrichtung
AT03425466T ATE311663T1 (de) 2003-07-14 2003-07-14 Hochstromschutzvorrichtung
EP03425466A EP1498927B1 (fr) 2003-07-14 2003-07-14 Dispositif de protection à courant de haute intensité

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP03425466A EP1498927B1 (fr) 2003-07-14 2003-07-14 Dispositif de protection à courant de haute intensité

Publications (2)

Publication Number Publication Date
EP1498927A1 EP1498927A1 (fr) 2005-01-19
EP1498927B1 true EP1498927B1 (fr) 2005-11-30

Family

ID=33462296

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03425466A Expired - Lifetime EP1498927B1 (fr) 2003-07-14 2003-07-14 Dispositif de protection à courant de haute intensité

Country Status (3)

Country Link
EP (1) EP1498927B1 (fr)
AT (1) ATE311663T1 (fr)
DE (1) DE60302564T2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102948027A (zh) * 2010-03-31 2013-02-27 利萨·德雷克塞迈尔有限责任公司 用于在车辆中的配电器的汇流排以及带有这种汇流排的配电器

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5681521B2 (ja) * 2010-04-06 2015-03-11 矢崎総業株式会社 ヒューズユニット
US9159984B2 (en) * 2011-11-25 2015-10-13 Samsung Sdi Co., Ltd. Rechargeable battery
DE102015115464B4 (de) 2014-09-15 2021-10-28 Kromberg & Schubert Gmbh Stromverteileranordnung
EP3567624A1 (fr) 2018-05-07 2019-11-13 Aptiv Technologies Limited Barre omnibus

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0924734B1 (fr) * 1997-12-17 2003-11-12 Meccanotecnica Codognese S.p.A. Dispositif de protection à courant fort
JP2001054223A (ja) * 1999-08-06 2001-02-23 Toyota Motor Corp ヒューズ装置
JP3826657B2 (ja) * 2000-03-10 2006-09-27 住友電装株式会社 ヒューズボックスユニット

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102948027A (zh) * 2010-03-31 2013-02-27 利萨·德雷克塞迈尔有限责任公司 用于在车辆中的配电器的汇流排以及带有这种汇流排的配电器
US9238441B2 (en) 2010-03-31 2016-01-19 Lisa Draexlmaier Gmbh Busbar for a power distributor in vehicles and power distributor having such a busbar
CN102948027B (zh) * 2010-03-31 2016-05-18 利萨·德雷克塞迈尔有限责任公司 用于在车辆中的配电器的汇流排以及带有这种汇流排的配电器

Also Published As

Publication number Publication date
DE60302564D1 (de) 2006-01-05
ATE311663T1 (de) 2005-12-15
EP1498927A1 (fr) 2005-01-19
DE60302564T2 (de) 2006-08-03

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