• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    This device (100) comprises current measuring elements (10, 20, 30, 40) housed in a housing (50). The housing (50) comprises a first portion (51) and a second portion (55, 57) of plastic, welded to each other, which together define a housing (52, 53) for receiving the measuring elements . The first portion (51) is opaque to absorb a laser beam welding portions, and the second portion (57) is transparent to let the laser beam. The manufacturing method of the device (100) comprises a mounting step in which the measuring elements (10, 20, 30, 40) are mounted in the housing (50), and an assembly step in which the parts (51) 55, 57) of the housing (50) are assembled together by a laser welding process.
    公开号:FR3030763A1
    申请号:FR1463219
    申请日:2014-12-23
    公开日:2016-06-24
    发明作者:Audrey Olivier；David Loglisci；Michel Rapeaux
    申请人:Schneider Electric Industries SAS；
    IPC主号:
    专利说明:

    [0001] The invention relates to a device comprising current measuring elements and to a method for manufacturing such a device. The invention particularly relates to mixed current sensors comprising in a housing a magnetic current sensor having a coil wound around a magnetic circuit and a current measuring device comprising a Rogowski-type winding.
    [0002] Rogoswki-type current measuring devices, such as the current sensor of EP-A-2667205, comprise a support made of non-magnetic material placed around a conductor or stream line in which the current to be measured flows. A conductive wire is wound on the support to form a secondary winding. The assembly forms a transformer where the conductor or current line constitutes a primary winding and the secondary winding provides a measurement signal. The voltage supplied across the secondary winding is directly proportional to the intensity of the electric current flowing in the conductor or power line. The absence of a magnetic core that can be saturated allows a wide measurement dynamic.
    [0003] The housing of the current sensor is in two parts, with a hollow base closed by a cover assembled to the base for example by welding. The insulation of the current sensor is simply provided by the sensor electronics. The dielectric insulation is between the power lines and the sensor housing. In the event of a fault in the welding of the housing parts, the user is in danger.
    [0004] To allow including the addition of a socket, for example standard USB type, it is necessary to improve the insulation made by the housing of the current sensor because the USB socket generates current leaks. For example, the current sensor is integrated in a circuit breaker having a front panel equipped with a programmable interface with a USB socket. The current sensor is connected to the front side of the electrical wires. It is necessary to isolate the user from the voltage present in the circuit breaker and through the sensor. The object of the invention is to provide a current sensor having an improved dielectric insulation at a high operating temperature, above 140 ° C. This effect, the invention relates to a device comprising current measuring elements housed in a housing. housing, the housing comprising a first portion and a second portion of plastic, welded to one another, which together define a receiving housing of the measuring elements. The first part is opaque to absorb a laser beam welding parts of the housing. The second part is transparent to let the laser beam pass.
    [0005] Thanks to the invention, the materials used for the housing of the device allow a laser welding of the first part of the housing on the second part, which improves the electrical insulation achieved by the housing. It is thus unnecessary to provide that the electronics inside the housing provides a double insulation function, which is expensive, complex, and increases the size.
    [0006] According to advantageous aspects of the invention, such a device may incorporate one or more of the following features, taken in any technically permissible combination: - The first part absorbs at least 60 (3/0, preferably at least 90 (3/0 , the power of a laser beam having a wavelength between 625 and 1100 nm, the material of the first part being in particular of black color - the second part passes at least 30 (3/0, of the power of a laser beam having a wavelength between 625 and 1100 nm - the first part delimits the housing and the second part is flat - preferably the thickness of the second part is between 0.5 and 3 mm, preferably between 0.8 and 1.6 mm - The parts of the case are manufactured from a polymeric composition with an organophosphorus flame retardant - The edges of at least one of the parts of the case are provided with tongues , preferably scored.
    [0007] Another aspect of the invention relates to a method of manufacturing a device comprising current measuring elements housed in a housing comprising a first portion and a second portion which together define a housing for receiving the measuring elements, the method comprising a mounting step in which the measuring elements are mounted in the housing. The method comprises an assembly step in which the housing parts are assembled together by a laser welding process. According to advantageous aspects of the invention, such a method may incorporate one or more of the following features, taken in any technically permissible combination: the method comprises an intermediate step between the mounting step and the assembling step, in the housing is depressed, for example a depression greater than 60 kPa, preferably greater than 90 kPa. - Preferably, the edges of at least one of the housing parts are provided with support tongues. During the intermediate stage, pressing the tabs reinforces the mechanical contact between the parts of the box. The invention will be better understood on reading the following description of a device according to the invention, and its manufacturing method, given solely by way of example and with reference to the appended drawings in which: Figure 1 is an exploded perspective view of a current sensor according to the invention; Figure 2 is a perspective view of the current sensor in assembled configuration; Figures 3 and 4 are perspective views of a base of a housing of the current sensor of Figures 1 and 2, according to the arrows F3 and F4 in Figure 1. The current sensor 100 shown in Figures 1 and 2 comprises a magnetic electric current sensor 30 and an electrical current measuring device 40 assembled in a housing 50. It is a mixed current sensor. The magnetic sensor 30 comprises a first winding 31 wound around a magnetic circuit 33. The measuring device 40 comprises a second winding 41 of the Rogowski type arranged in such a way that a first primary circuit of the magnetic sensor 30 corresponds to a second primary circuit of the current measuring device 40. The winding 41 Rogowski type is composed of an insulating casing 43 on which is wound a wire. As an exemplary embodiment, the carcass 43 is circular in shape, hollow, of non-magnetic material, rigid or semi-rigid and preferably of cylindrical or ovoidal section. The wire wound on the carcass 43 is preferably made of copper or a copper-based alloy. The housing 50 is provided with a central recess 90 allowing the passage of the conductor or current line on which the measurement of the current is carried out. This conductor or current line forms the primary circuit of the current measuring device 40. The current sensor 100 comprises electronic means 20 for acquiring and measuring the electric current. The electronic means 20 are powered by the winding 31 of the magnetic sensor 30.
    [0008] A connecting cassette 10 comprising fixing means connects the measuring device 40 to the electronic means 20. The box 50 comprises a first part or base 51, comprising a housing 52 for the electronic means 20 for acquisition and measurement. One of the walls 56 of the housing 52 has an opening 58 for the passage of the connecting cassette 10. The fixing means are arranged to position and hold the cassette 10 by snapping on the current measuring device 40. The cassette 10 is fixed on the measuring device 40 in a reproducible position, which facilitates the mounting of the current sensor 100.
    [0009] The casing 43 of the winding 41 comprises latching means capable of collaborating with the fastening means of the connecting cassette 10. Second fixing means of the cassette 10 are arranged to position and hold by snap-fastening the cassette 10 and the device The assembly formed by the connecting cassette 10 and the measuring device 40 is fixed to the housing 50 in a reproducible position, which facilitates the mounting of the current sensor 100. The cassette 10 comprises electrical pins 13 respectively connected to the winding 41 and to the electronic means 20. By way of example, the electrical pins 13 are welded to the electronic means 20. An automated laser braze welding process can be used. Optionally, the electronic means 20 comprise connection pads intended to be connected to a socket. The base 51 delimits a first hollow housing 53 inside which the magnetic sensor 30 and the measuring device 40 are positioned. The base 51 comprises a generally flat bottom wall 59 which defines a rear face AR of the current sensor 100 and communicates with the second housing 52 through the opening 58. The bottom wall 59 is adjacent to side walls 54 of the base extending perpendicularly to the bottom wall 59. External edges B53 of these walls 54 extend in a foreground P53. The housing 53 is a hollow volume open towards the outside of the housing 50, opposite the bottom wall 59.
    [0010] The bottom wall 59 generally has the shape of a rectangle whose short edge is in the shape of a semicircle. The housing 50 comprises a second portion or first cover 57 plane fixed on the outer edges B53 of the walls 54 of the housing 53 of the base 51, which closes the housing 53 and defines the front face AV of the housing 50. The cover 57 is parallel to the bottom wall 59 and its shape is similar to that of the bottom wall 59. B57 is noted the outer edges of the cover 57, which are welded to the edges B53 of the walls 54 The magnetic sensor 30 is connected to the electronic means 20 by tracks electric. The electronic means 20 comprise a printed circuit board arranged to be positioned inside the walls 56 of the second housing 52. The printed circuit board has holes 21 allowing the electrical pins 13 of the cassette 10 to be interlocked. optionally, the housing 50 comprises a second plane cover 55 intended to be fixed on the outer edges B52 of the walls 56 of the second housing 52 of the base 51. The edges B52 extend in a second plane P52 perpendicular to the first plane B53. The edges B52 define an opening of the housing 52 which opens out of the housing 50. The base 51 and the covers 55 and 57 together define the hollow volume of the housing 50, that is to say the housing 53.
    [0011] The base 51 and the covers 55 and 57 are made from a plastic material, for example a polymer, adapted to allow the lids 55 and 57 to be assembled with the base 51 by a laser welding process. The wavelength of the laser beam used for this assembly, represented by the arrows F55 and F57 in FIG. 2, is in the range and the infrared, namely between 625 and 1100 nm.
    [0012] By way of example, the wavelength of the F55 or F57 laser beam is equal to 980 nm. For example, the power of the laser beam F55 or F57 is equal to 480 W. For the welding of the first cover 57, the laser beam F57 is oriented perpendicular to the plane of the cover 57 and the edges B53, parallel to the walls 54 of the base 51. The laser beam F57 is positioned outside the housing 50, in the extension of the walls 54 of the housing 53 and is oriented towards the cover 57. For the welding of the second cover 55, the laser beam F55 is oriented perpendicular to the plane cover 55, parallel to the walls 56 and the edges B52, and in their extension. The laser beam F55 is positioned outside the housing 50, in the extension of the walls 56 of the housing 52 and is oriented towards the cover 55. The laser beam F55 or F57 melts the material of the housing 50, which weld the cover 55 or 57 at the edges B52 or B53 of the base 51. Thus, there is obtained a continuity of material between the base 51 and the cover 55 or 57 and the free spaces between these elements are eliminated, which improves the electrical insulation of the housing 50. A dielectric seal is thus made between the base 51 and the cover 55 or 57.
    [0013] The material of the covers 55 and 57 is chosen so that, during welding, the laser beam F55 or F57 passes through the material of the cover 55 or 57 and is absorbed by the material of the housing 51. The covers 55 and 57 are transparencies to pass the beam F55 or F57, at least partially, while the base 51 is opaque to absorb the beam F55 or F57, at least partially. The covers 55 and 57 let the laser beam F55 or F57 pass more than the base 51. Similarly, the base 51 absorbs the laser beam F55 or F57 more than the covers 55 and 57. By "transparencies" is meant that the covers 55 and 57 pass at least 60 (3/0 of the total intensity of the beam F55 or F57, preferably at least 90 `Vo. The value of the transparency of the covers 55 and 57 depends on their Preferably, the thickness of the covers 55 and 57 is between 0.5 and 3 mm, preferably between 0.8 and 1.6 mm, For example, the covers 55 and 57 have a constant thickness of 1.2 mm.
    [0014] By "opaque" is meant that the base absorbs at least 30% (3% of the total intensity of the F55 or F57 beam.) For example, the covers 55 and 57 and the base 51 are made from a plastic material flame retardant made from a polymeric composition with a flame retardant For example, the polymeric composition is a partially aromatic polyamide resin reinforced with 20 to 40% glass fiber and flame retarded, preferably with a flame retardant. organophosphorus flame retardant system The color shade "natural" for the covers 55 and 57 will preferably be chosen Other light colors may be suitable, and the color shade "black" for the base 51, preferably other absorbing colors may be suitable.
    [0015] The black color is obtained for example by the addition of black pigments that promote the absorption of the F1 or F2 laser beam. It may be a carbon black type mineral pigment, or an organic negro type pigment. These materials comply with the IEC 60947-1 standard for electrical insulation.
    [0016] As indicated in Table XV of this standard, for a rated insulation voltage Ui of 1000 V, the minimum length of the leakage lines Lf, for a degree of pollution 3 and the group I of materials, is equal to 12.5 mm. For a rated insulation voltage Ui of 1250 V, the minimum length of the leakage lines Lf is equal to 16 mm. For reinforced insulation, these lengths are doubled. The groups of materials are defined by their path resistance index, which is greater than or equal to 600 V for group I. The degree of pollution is defined by IEC 60664-1: 1992 and characterizes the expected pollution of the micro- environment. The degree of pollution 3 indicates the presence of a conductive pollution or a dry, non-conductive pollution, which becomes conductive as a result of the condensation that may occur. In accordance with IEC 61140, paragraph 5.1, paints, varnishes, lacquers and similar products shall not be considered as sufficient insulation for protection against electric shock in normal operation.
    [0017] Alternatively, the base 51 and the first cover 57 of the housing 50 are replaced by two half-boxes each having a hollow shape and each having external edges extending in a plane and intended to be fixed with each other. other. These two parts of the housing then define a reception volume of the magnetic sensor and the measuring device 40, when they are in assembled configuration, that is to say when their outer edges are fixed with each other. The invention has been described with reference to a mixed current sensor including Rogowski type winding, but it also applies to other types of current sensors. In the example described, the elements 10, 20, 30 and 40 form means for measuring the current, but these elements can be replaced by other types of current measuring means. In a variant, the invention applies to any system that comprises current measuring elements, for example a sensor, an inductor, Hall effect sensors or magnetoresistance sensors, or even electromechanical elements, for example an actuator such as a control member, in particular a circuit breaker.
    [0018] The invention also relates to a method of manufacturing a system comprising electronic or electromagnetic current measuring elements. It may be a current sensor such as the current sensor 100 described above. The method consists, in a first step, of mounting the cassette 10, the electronic means 20, the magnetic sensor 30 and the measuring device 40 in the housing 53 of the base 51 of the housing 50. The cassette 10 is fixed on the carcass 43 of the measuring device 40. The Rogowski type winding wires 41 are electrically connected to the electrical pins 13 of the cassette 10. The assembly formed by the cassette 10 and the carcass 43 is then positioned and fixed in the housing 53 of the base 51 to limp 50.
    [0019] The magnetic sensor 30 is then fixed in the base 51 of the housing 50. Fastening means are used to secure the magnetic sensor 30 and the measuring device 40 to the base 51 of the housing 50. An electrical connection is made between the electrical tracks and the winding 31 of the magnetic sensor 30. The connection can be provided for example by electric welding. The printed circuit board of the electronic means 20 is then positioned inside the walls of the first housing 52. The electrical pins 13 of the cassette 10 connecting through the holes 21 present on the circuit. The electrical pins 13 are then preferably welded by an automated laser solder solder process. In a subsequent step, the covers 55 and 57 are assembled to the base 51. The order of assembly of the covers 55 and 57 on the base is indifferent. The first cover 57 is positioned on the outer edges B53 of the walls 54 of the first housing 53 of the base 51. The first cover 57 and the edges B53 extend in the plane P53, providing mechanical contact between the edges B53 and the cover 57. The first cover 57 is then welded to the edges B53 by means of the laser beam F57. To improve the mechanical contact during the laser welding between the base 51 and the first cover 57, a suction system is used to evacuate inside the housing 50, before the welding of the cover 55. For example, the vacuum is created by the opening 58 of the base 51. A vacuum switch checks the pressure inside the housing 50. During the passage of the F57 laser beam, there is a decrease of 0.3 mm in the thickness of the cover 57. The depression allows to ensure mechanical contact between the cover 57 and the base 51 despite this deformation. For example, the depression is greater than 60 kPa, preferably greater than 80 kPa. In order to improve the mechanical contact between the cover 57 and the housing 51, the cover 57 is provided with tabs 70 distributed along the edges B57 of the cover 57. When the cover 57 is welded, when the housing 50 is depressurized, fingers of a not shown robot press on these tabs 70 to promote contact with the base 51. Preferably, the tabs 70 are scored to facilitate their subsequent tearing. The second cover 55 is positioned on the outer edges B52 of the walls 56 of the second housing 52. The outer edges B52 and the second cover 55 extend in the plane P52, which ensures a mechanical contact between the edges B52 and the cover 55. The second cover 55 is then welded to the edges B52 by means of the laser beam F55. As can be seen in FIG. 3, the bottom wall 59 of the base 51 is provided with reinforcing ribs 60, on its outer face, which contribute to the geometric conformity of the base 51 during the molding of this part. In the example described, the base 51 defines the housing 53 and the cover 57 is plane. Alternatively, the two parts 51 and 57 of the housing 50 may each define a housing, that is to say have a concave shape. The hollow volume of the housing 50 is then formed by the meeting of these two housing.
    [0020] The presence of several covers 55 and 57 is optional, the housing 50 may comprise a single cover. According to the invention, the different variants described can be combined together, at least partially.
    权利要求:
    Claims (10)
    [0001]
    CLAIMS1.- Device (100) comprising measuring elements (10, 20, 30, 40) of current housed in a housing (50), the housing (50) comprising a first portion (51) and a second portion (55, 57) of plastic, welded to each other, which together define a housing (52, 53) for receiving the measuring elements, characterized in that the first part (51) is opaque for absorbing a laser beam ( F55, F57) for welding the portions (51, 55, 57) and that the second portion (57) is transparent to pass the laser beam (F55, F57).
    [0002]
    2. Device (100) according to claim 1, characterized in that the first part (51) absorbs at least 60 (3/0, preferably at least 90 (3/0) of the power of a laser beam ( F55, F57) having a wavelength between 625 and 1100 nm, the material of the first part (51) being in particular black.
    [0003]
    3.- Device (100) according to one of claims 1 or 2, characterized in that the second part (55, 57) passes at least 30 (3/0, the power of a laser beam (F55, F57) having a wavelength of between 625 and 1100 nm.
    [0004]
    4.- Device (100) according to one of claims 1 to 3, characterized in that the first portion (51) defines the housing (52, 53) and in that the second portion (55, 57) is flat.
    [0005]
    5.- Device (100) according to claim 4, characterized in that the thickness of the second portion (55, 57) is between 0.5 and 3 mm, preferably between 0.8 and 1.6 mm.
    [0006]
    6.- Device (100) according to one of the preceding claims, characterized in that the parts (51, 55, 57) of the housing (50) are manufactured from a polymeric composition with an organophosphorus flame retardant.
    [0007]
    7.- Device (100) according to one of the preceding claims, characterized in that the edges (B52, B53, B57) of at least one of the parts (51, 55, 57) of the housing (50) are provided with tabs (70), preferably scored.
    [0008]
    8. A method of manufacturing a device (100) comprising current measuring elements (10, 20, 30, 40) housed in a housing (50) comprising a first portion (51) and a second portion (55, 57) which together define a housing (53) for receiving the measuring elements, the method comprising a mounting step in which the measuring elements (10, 20, 30, 40) are mounted in the housing (50), characterized in that it comprises an assembly step in which the parts (51, 55, 57) of the housing (50) are assembled together by a laser welding process.
    [0009]
    9. A method according to claim 8, characterized in that it comprises an intermediate step between the mounting step and the assembly step, wherein the housing (52, 53) is depressed, for example a depression greater than 60 kPa, preferably greater than 80 kPa.
    [0010]
    10. A method according to claim 9, characterized in that the edges (B52, B53, B57) of at least one of the parts (51, 55, 57) of the housing (50) are provided with support tongues. (70) and in that, in the intermediate step, a support on the tabs (70) reinforces the mechanical contact between the parts (51, 55, 57) of the housing (50).
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    同族专利:
    公开号 | 公开日
    CN105842515B|2020-11-27|
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    EP3037829B1|2018-04-04|
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    US20160178661A1|2016-06-23|
    FR3030763B1|2017-02-10|
    引用文献:
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    法律状态:
    2015-06-25| PLFP| Fee payment|Year of fee payment: 2 |
    2016-06-24| PLSC| Search report ready|Effective date: 20160624 |
    2016-12-12| PLFP| Fee payment|Year of fee payment: 3 |
    2017-12-18| PLFP| Fee payment|Year of fee payment: 4 |
    2019-09-27| ST| Notification of lapse|Effective date: 20190906 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1463219A|FR3030763B1|2014-12-23|2014-12-23|DEVICE COMPRISING CURRENT MEASURING ELEMENTS AND METHOD FOR MANUFACTURING SUCH A DEVICE|FR1463219A| FR3030763B1|2014-12-23|2014-12-23|DEVICE COMPRISING CURRENT MEASURING ELEMENTS AND METHOD FOR MANUFACTURING SUCH A DEVICE|
    US14/972,282| US10330699B2|2014-12-23|2015-12-17|Device comprising elements for measuring current and process for manufacturing such a device|
    ES15201915.4T| ES2671739T3|2014-12-23|2015-12-22|Current sensor and manufacturing procedure of such sensor|
    EP15201915.4A| EP3037829B1|2014-12-23|2015-12-22|Current sensor and method for manufacturing such a sensor|
    PL15201915T| PL3037829T3|2014-12-23|2015-12-22|Current sensor and method for manufacturing such a sensor|
    CN201511036282.1A| CN105842515B|2014-12-23|2015-12-23|Device comprising an element for measuring a current and method for producing the same|
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