US20160245474A1 - System for the electrically connecting at least one light source to an electrical power supply system - Google Patents

System for the electrically connecting at least one light source to an electrical power supply system Download PDF

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Publication number
US20160245474A1
US20160245474A1 US15/027,309 US201415027309A US2016245474A1 US 20160245474 A1 US20160245474 A1 US 20160245474A1 US 201415027309 A US201415027309 A US 201415027309A US 2016245474 A1 US2016245474 A1 US 2016245474A1
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US
United States
Prior art keywords
lead frame
light source
connecting terminal
electrical power
allowing
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.)
Abandoned
Application number
US15/027,309
Inventor
Marc Duarte
Eric MORNET
Sylvain YVON
Jonathan BLANDIN
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Valeo Vision SAS
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Valeo Vision SAS
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Publication date
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Publication of US20160245474A1 publication Critical patent/US20160245474A1/en
Assigned to VALEO VISION reassignment VALEO VISION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BLANDIN, JONATHAN, DUARTE, MARC, MORNET, ERIC, YVON, SYLVAIN
Abandoned legal-status Critical Current

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Classifications

    • F21S48/215—
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
    • F21S45/40—Cooling of lighting devices
    • F21S45/47—Passive cooling, e.g. using fins, thermal conductive elements or openings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/141—Light emitting diodes [LED]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/141—Light emitting diodes [LED]
    • F21S41/147—Light emitting diodes [LED] the main emission direction of the LED being angled to the optical axis of the illuminating device
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/141—Light emitting diodes [LED]
    • F21S41/151—Light emitting diodes [LED] arranged in one or more lines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/19—Attachment of light sources or lamp holders
    • F21S41/192—Details of lamp holders, terminals or connectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/10—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the light source
    • F21S43/13—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the light source characterised by the type of light source
    • F21S43/14—Light emitting diodes [LED]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/10—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the light source
    • F21S43/19—Attachment of light sources or lamp holders
    • F21S43/195—Details of lamp holders, terminals or connectors
    • F21S48/115—
    • F21S48/328—
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V19/00—Fastening of light sources or lamp holders
    • F21V19/001—Fastening of light sources or lamp holders the light sources being semiconductors devices, e.g. LEDs
    • F21V19/0015—Fastening arrangements intended to retain light sources
    • F21V19/0025—Fastening arrangements intended to retain light sources the fastening means engaging the conductors of the light source, i.e. providing simultaneous fastening of the light sources and their electric connections
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V23/00—Arrangement of electric circuit elements in or on lighting devices
    • F21V23/003—Arrangement of electric circuit elements in or on lighting devices the elements being electronics drivers or controllers for operating the light source, e.g. for a LED array
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L25/00—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof
    • H01L25/03—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes
    • H01L25/04—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers
    • H01L25/075—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L33/00
    • H01L25/0753—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L33/00 the devices being arranged next to each other
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
    • H01L33/62—Arrangements for conducting electric current to or from the semiconductor body, e.g. lead-frames, wire-bonds or solder balls
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
    • H01L33/64—Heat extraction or cooling elements
    • H01L33/647—Heat extraction or cooling elements the elements conducting electric current to or from the semiconductor body
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
    • H01L33/64—Heat extraction or cooling elements
    • H01L33/641—Heat extraction or cooling elements characterized by the materials
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/02—Details
    • H05K1/0201—Thermal arrangements, e.g. for cooling, heating or preventing overheating
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
    • H05K2201/10007—Types of components
    • H05K2201/10022—Non-printed resistor
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
    • H05K2201/10007—Types of components
    • H05K2201/10106—Light emitting diode [LED]

Definitions

  • the subject of the present invention is a system for electrically connecting at least one light source to a system for supplying electrical power.
  • Patent application FR 2 906 347 discloses a vehicle light device that comprises a lighting module, this module including:
  • the conductive board of the lighting module that is the subject of patent application FR 2 906 347 must necessarily comprise said cavities in order to be able to place the lighting devices therein. Additional forming operations must thus be carried out in order to give the conductive board a specific shape.
  • the objective of the present invention is especially to remedy these drawbacks by providing a system for electrically connecting at least one light source such as a light-emitting diode to a system for supplying electrical power, the simplified structure of which especially allows design and production costs to be decreased.
  • a lead frame is a structure of conductive tracks, which structure is of integral construction.
  • This lead frame may for example be a plate stamped to form the electrical tracks, then overmolded on an insulating substrate and the portions of which other than those forming the tracks are separated from the plate after the overmolding.
  • the light source is electrically connected to the lead frame while being remote and distant from the latter, thereby advantageously allowing the structure of the lead frame to be simplified. Specifically, it is no longer necessary to make provision for a specific location in the lead frame in order to place therein the light source or to fix to the lead frame a means for specifically dissipating the heat emitted by the light source.
  • An arrangement of the light source away from the lead frame is defined as being an arrangement of the light source at a distance from the lead frame that significantly decreases or even prevents the exposure of the lead frame to the heat emitted by the light source, thereby making it possible to dispense with fastening the lead frame to a means able to specifically dissipate the heat of the light source.
  • the lead frame includes a first means for dissipating heat allowing the heat generated by the lead frame to be dissipated.
  • the first means for dissipating heat is a resistive circuit.
  • the lead frame includes a converter allowing the, especially AC, voltage of the current delivered by the system for supplying electrical power to be converted into an, especially DC, voltage applied to the connecting terminal of the lead frame.
  • the voltage applied to the connecting terminal is preferably suitable for supplying the light source with power.
  • the lead frame may include a means for protecting from electromagnetic interference.
  • the first means for dissipating heat advantageously consists of the converter.
  • the converter is able to continue to operate normally even in the case of substantial heat dissipation.
  • the lead frame includes a control circuit that controls the voltage of the current applied to said connecting terminal.
  • the connecting terminal of the lead frame is a connecting pad able to allow the light source to be connected by application of the wire bonding technique.
  • This connection may be achieved by a conductive bridge for example.
  • the connecting means is an electrically conductive wire.
  • the lead frame comprises a printed circuit board to which electronic components may be connected.
  • This board comprises a plurality of electrical tracks allowing electrical current to be transported, electronic components being soldered to these tracks using connecting pins.
  • the end of the connecting pins of the electronic components passes through through-holes in the board, thereby allowing visual inspection of the quality of the solder joints formed on these ends to be carried out by means of optical devices.
  • the lead frame comprises an advantageously electrically insulating border extending perpendicularly from the board, this border including:
  • the border and the board advantageously define a seal-tight tray, this tray being filled with a liquefied plastic product.
  • One of the longitudinal walls of the border may comprise a recess in which the connecting terminal is placed.
  • one of the transverse walls of the border comprises on its external face a protruding housing the walls of which extend substantially perpendicular to said transverse wall, the lead frame including at least one electrical connector placed in this housing, this connector allowing the lead frame to be connected to the system for supplying electrical power.
  • the external face is here the face directed toward the exterior of the lead frame.
  • Another subject of the invention is a light-emitting assembly, characterized in that it comprises:
  • the first means for dissipating heat is advantageously able to dissipate more heat than the second means for dissipating heat.
  • the light source is a light-emitting diode (LED), this light-emitting diode possibly being single- or multi-die diodes.
  • LED light-emitting diode
  • the second means for dissipating heat is preferably a holder of the light source.
  • the second means for dissipating heat advantageously consists of a substrate on which the light source is mounted.
  • This holder may for example be made of metal or of ceramic.
  • the second means for dissipating heat comprises a radiator placed near or in contact with the light source, this second means for dissipating heat possibly being associated with a heat pipe joined at one of its ends to the lead frame and at its other end to the radiator.
  • a heat pipe is made possible by virtue of the arrangement of the light source away from the lead frame, which allows bulk at the lead-frame level to be decreased.
  • the second means for dissipating heat includes a radiator and a metal holder of the aforementioned type.
  • Another subject of the present invention is also a lighting and/or signaling device for an automotive vehicle, characterized in that it includes a light-emitting assembly according to the invention.
  • FIG. 1 is a schematic perspective representation of the lead frame of the system according to invention.
  • FIG. 2 is a schematic perspective representation of the lead frame of the system according to the invention to which a light source is connected.
  • the electrically connecting system 1 includes a lead frame 3 able to be electrically connected to a system for supplying electrical power (not shown) such as the electrical circuit of a vehicle.
  • the lead frame 3 takes substantially the form of a tray comprising:
  • the board 7 is for example a PCB (printed circuit board) that includes at least one conductive layer overmolded with an electrically insulating material, for example an epoxy resin or fiberglass.
  • PCB printed circuit board
  • This board 7 comprises electrical tracks 14 allowing electrical current to be transported, these electrical tracks 14 being produced by subjecting the conductive layer of the board 7 to a stamping process.
  • the lead frame 3 includes electronic components that are generally connected to said board 7 by laser soldering, these electronic components extending, according to the orientation of FIG. 1 , above the board 7 .
  • the end of the connecting pins of the electronic components pass through the board 7 , thereby allowing visual inspection of the quality of the solder joints formed on these ends to be carried out by means of optical devices.
  • the lead frame 3 includes at least one electrical connector 15 placed in the housing 11 , this connector 15 being connected to at least one of the electrical tracks 14 .
  • the connector 15 allows the lead frame 3 to be connected to the system 1 for supplying electrical power.
  • the electrical connector 15 may, for example, be a connecting pad able to allow the system for supplying electrical power to be connected by application of the wire bonding technique.
  • the lead frame 3 also comprises at least one connecting terminal 4 placed in the recess 9 , this connecting terminal 4 being able to interact with a connecting means 5 , to electrically connect a light source 2 to the lead frame 3 .
  • the connecting terminal 4 is a connecting pad able to allow the light source 2 to be connected by application of the wire bonding technique, the connecting means 5 being an electrically conductive wire.
  • the lead frame 3 includes a first means 6 for dissipating heat allowing the heat generated by the lead frame 3 to be dissipated, this first means 6 for dissipating heat consisting of a resistive circuit.
  • the lead frame 3 comprises:
  • the lead frame 3 allows the voltage of the current delivered by the system for supplying electrical power to be converted and adapted in order to apply to the connecting terminal 4 a suitable voltage.
  • the space bounded by the border of the lead frame 3 may be filled with a liquefied plastic product (using a potting process).
  • a lighting assembly 16 comprises:
  • each connecting means 5 connects one connecting terminal 4 to a conductive pad 18 that is connected to at least one light source 2 .
  • the light source 2 and said conductive pads 18 are placed on the second means 17 for dissipating heat, consisting in the present case of a metal holder.
  • the light source 2 is a light-emitting diode the emissive portion of which is composed of a semiconductor chip or of a plurality of semiconductor chips, in the first case the diode is what is called a mono-chip diode and in the second case the diode is what is called a multi-chip diode.

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Power Engineering (AREA)
  • Optics & Photonics (AREA)
  • Computer Hardware Design (AREA)
  • Manufacturing & Machinery (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
  • Led Device Packages (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

A system for electrically connecting at least one light source to a system for supplying electrical power, wherein the connecting system comprises:
    • a lead frame able to be electrically connected to a system for supplying electrical power, the lead frame including at least one connecting terminal and
    • at least one connecting means allowing the connecting terminal of the lead frame to be electrically connected to the light source,
      the connecting terminal and the connecting means being able to electrically connect the light source to the lead frame, thereby allowing the light source to be placed away from the lead frame.

Description

  • The subject of the present invention is a system for electrically connecting at least one light source to a system for supplying electrical power.
  • It typically, but not exclusively, is applicable to a system allowing at least one light emitting diode to be electrically connected to the system for supplying electrical power of a motorized vehicle.
  • Patent application FR 2 906 347 discloses a vehicle light device that comprises a lighting module, this module including:
      • lighting devices each comprising a light-emitting unit;
      • a conductive board that includes cavities for receiving the lighting devices, this board allowing the lighting devices to be connected, especially by means of electrical tracks, to a source of electrical power;
      • a heat-dissipating holder on which the lighting devices are placed;
      • an adhesive part placed between the dissipating holder and the conductive board, which especially allows the lighting devices to be precisely positioned in the cavities of the conductive board.
  • It turns out that the conductive board of the lighting module that is the subject of patent application FR 2 906 347 must necessarily comprise said cavities in order to be able to place the lighting devices therein. Additional forming operations must thus be carried out in order to give the conductive board a specific shape.
  • In addition, in order to preserve the luminous efficacy of the lighting devices, it is recommendable to make use of a system for dissipating heat, such as said heat-dissipating holder, thereby complexyfing the structure of the lighting module.
  • The objective of the present invention is especially to remedy these drawbacks by providing a system for electrically connecting at least one light source such as a light-emitting diode to a system for supplying electrical power, the simplified structure of which especially allows design and production costs to be decreased.
  • For this purpose, it provides a system for electrically connecting at least one light source to a system for supplying electrical power,
  • characterized in that said connecting system comprises:
      • a lead frame able to be electrically connected to a system for supplying electrical power, the lead frame including at least one connecting terminal; and
      • at least one connecting means allowing the connecting terminal of the lead frame to be electrically connected to the light source,
        the connecting terminal and the connecting means being able to electrically connect the light source to the lead frame, thereby allowing the light source to be placed away from the lead frame.
  • Above and in what follows, a lead frame is a structure of conductive tracks, which structure is of integral construction. This lead frame may for example be a plate stamped to form the electrical tracks, then overmolded on an insulating substrate and the portions of which other than those forming the tracks are separated from the plate after the overmolding.
  • In this way, the light source is electrically connected to the lead frame while being remote and distant from the latter, thereby advantageously allowing the structure of the lead frame to be simplified. Specifically, it is no longer necessary to make provision for a specific location in the lead frame in order to place therein the light source or to fix to the lead frame a means for specifically dissipating the heat emitted by the light source. An arrangement of the light source away from the lead frame is defined as being an arrangement of the light source at a distance from the lead frame that significantly decreases or even prevents the exposure of the lead frame to the heat emitted by the light source, thereby making it possible to dispense with fastening the lead frame to a means able to specifically dissipate the heat of the light source.
  • Preferably, the lead frame includes a first means for dissipating heat allowing the heat generated by the lead frame to be dissipated.
  • Preferably, the first means for dissipating heat is a resistive circuit.
  • Preferably, the lead frame includes a converter allowing the, especially AC, voltage of the current delivered by the system for supplying electrical power to be converted into an, especially DC, voltage applied to the connecting terminal of the lead frame.
  • The voltage applied to the connecting terminal is preferably suitable for supplying the light source with power.
  • The lead frame may include a means for protecting from electromagnetic interference.
  • The first means for dissipating heat advantageously consists of the converter. In this case, the converter is able to continue to operate normally even in the case of substantial heat dissipation.
  • Advantageously, the lead frame includes a control circuit that controls the voltage of the current applied to said connecting terminal.
  • Preferably, the connecting terminal of the lead frame is a connecting pad able to allow the light source to be connected by application of the wire bonding technique. This connection may be achieved by a conductive bridge for example.
  • Preferably, the connecting means is an electrically conductive wire.
  • Preferably, the lead frame comprises a printed circuit board to which electronic components may be connected.
  • This board comprises a plurality of electrical tracks allowing electrical current to be transported, electronic components being soldered to these tracks using connecting pins.
  • If needs be, the end of the connecting pins of the electronic components passes through through-holes in the board, thereby allowing visual inspection of the quality of the solder joints formed on these ends to be carried out by means of optical devices.
  • Preferably, the lead frame comprises an advantageously electrically insulating border extending perpendicularly from the board, this border including:
      • two substantially parallel longitudinal walls; and
      • two substantially parallel transverse walls, which each connect the two longitudinal walls.
  • The border and the board advantageously define a seal-tight tray, this tray being filled with a liquefied plastic product.
  • One of the longitudinal walls of the border may comprise a recess in which the connecting terminal is placed.
  • Preferably, one of the transverse walls of the border comprises on its external face a protruding housing the walls of which extend substantially perpendicular to said transverse wall, the lead frame including at least one electrical connector placed in this housing, this connector allowing the lead frame to be connected to the system for supplying electrical power.
  • The external face is here the face directed toward the exterior of the lead frame.
  • Another subject of the invention is a light-emitting assembly, characterized in that it comprises:
      • a system for electrically connecting at least one light source to a system for supplying electrical power according to the invention;
      • at least one light source; and
      • a second means for dissipating heat allowing the heat generated by the light source to be dissipated, this second means for dissipating heat being disconnected from the lead frame.
  • The first means for dissipating heat is advantageously able to dissipate more heat than the second means for dissipating heat.
  • Preferably, the light source is a light-emitting diode (LED), this light-emitting diode possibly being single- or multi-die diodes.
  • The second means for dissipating heat is preferably a holder of the light source.
  • The second means for dissipating heat advantageously consists of a substrate on which the light source is mounted. This holder may for example be made of metal or of ceramic.
  • According to one variant embodiment of the invention, the second means for dissipating heat comprises a radiator placed near or in contact with the light source, this second means for dissipating heat possibly being associated with a heat pipe joined at one of its ends to the lead frame and at its other end to the radiator. The use of a heat pipe is made possible by virtue of the arrangement of the light source away from the lead frame, which allows bulk at the lead-frame level to be decreased.
  • According to one variant embodiment of the invention, the second means for dissipating heat includes a radiator and a metal holder of the aforementioned type.
  • Another subject of the present invention is also a lighting and/or signaling device for an automotive vehicle, characterized in that it includes a light-emitting assembly according to the invention.
  • Other features and advantages of the present invention will become apparent in light of the following examples and appended figures, said examples and figures being given by way of completely nonlimiting illustration.
  • FIG. 1 is a schematic perspective representation of the lead frame of the system according to invention.
  • FIG. 2 is a schematic perspective representation of the lead frame of the system according to the invention to which a light source is connected.
    •
  • For the sake of clarity, only elements essential to the comprehension of the invention have been shown schematically and not to scale.
  • Such as shown in FIG. 1, the electrically connecting system 1 according to the invention includes a lead frame 3 able to be electrically connected to a system for supplying electrical power (not shown) such as the electrical circuit of a vehicle.
  • The lead frame 3 takes substantially the form of a tray comprising:
      • a printed circuit board 7 to which electronic components may be connected; and
      • a border including:
        • two substantially parallel longitudinal walls 8, 8′, one of these longitudinal walls 8 comprising a recess 9; and
        • a two substantially parallel transverse walls 10, 10′ that each connect the two longitudinal walls 8, 8′, one of these transverse walls 10 comprising on its external face a protruding housing 11 the walls of which extend substantially perpendicular to said transverse wall 10, this housing 11 including:
      • two substantially parallel longitudinal walls 12, 12′; and
      • two substantially parallel transverse walls 13, 13′ each connecting the longitudinal walls 12, 12′.
  • The board 7 is for example a PCB (printed circuit board) that includes at least one conductive layer overmolded with an electrically insulating material, for example an epoxy resin or fiberglass.
  • This board 7 comprises electrical tracks 14 allowing electrical current to be transported, these electrical tracks 14 being produced by subjecting the conductive layer of the board 7 to a stamping process.
  • The lead frame 3 includes electronic components that are generally connected to said board 7 by laser soldering, these electronic components extending, according to the orientation of FIG. 1, above the board 7.
  • The end of the connecting pins of the electronic components pass through the board 7, thereby allowing visual inspection of the quality of the solder joints formed on these ends to be carried out by means of optical devices.
  • The lead frame 3 includes at least one electrical connector 15 placed in the housing 11, this connector 15 being connected to at least one of the electrical tracks 14. The connector 15 allows the lead frame 3 to be connected to the system 1 for supplying electrical power. The electrical connector 15 may, for example, be a connecting pad able to allow the system for supplying electrical power to be connected by application of the wire bonding technique.
  • The lead frame 3 also comprises at least one connecting terminal 4 placed in the recess 9, this connecting terminal 4 being able to interact with a connecting means 5, to electrically connect a light source 2 to the lead frame 3.
  • The connecting terminal 4 is a connecting pad able to allow the light source 2 to be connected by application of the wire bonding technique, the connecting means 5 being an electrically conductive wire.
  • In addition, the lead frame 3 includes a first means 6 for dissipating heat allowing the heat generated by the lead frame 3 to be dissipated, this first means 6 for dissipating heat consisting of a resistive circuit.
  • Furthermore, the lead frame 3 comprises:
      • a means allowing the AC voltage of the current delivered by the system for supplying electrical power to be converted into a DC voltage applied to the connecting terminal 4 of the lead frame 3; and
      • a switching circuit that controls that voltage of the current which is applied to said connecting terminal 4, the switching circuit possibly for example ensuring that this voltage is comprised in a defined interval.
  • In this way, the lead frame 3 allows the voltage of the current delivered by the system for supplying electrical power to be converted and adapted in order to apply to the connecting terminal 4 a suitable voltage.
  • According to one variant embodiment of the invention, the space bounded by the border of the lead frame 3 may be filled with a liquefied plastic product (using a potting process).
  • Such as is shown in FIG. 2, a lighting assembly 16 according to the invention comprises:
      • a system 1 for electrically connecting at least one light source 2 to a system for supplying electrical power as described above;
      • at least one light source 2; and
      • a second means 17 for dissipating heat allowing the heat generated by the light source 2 to be dissipated, this second means 17 for dissipating heat being disconnected from the lead frame 3.
  • Thus, each connecting means 5 connects one connecting terminal 4 to a conductive pad 18 that is connected to at least one light source 2.
  • The light source 2 and said conductive pads 18 are placed on the second means 17 for dissipating heat, consisting in the present case of a metal holder.
  • The light source 2 is a light-emitting diode the emissive portion of which is composed of a semiconductor chip or of a plurality of semiconductor chips, in the first case the diode is what is called a mono-chip diode and in the second case the diode is what is called a multi-chip diode.
  • Placing the light source 2 away from the lead frame 3 makes it possible to simplify the structure of the lead frame 3, which no longer requires means for specifically dissipating the heat emitted by the light source 2.

Claims (20)

1. A system for electrically connecting at least one light source to a system for supplying electrical power,
wherein said connecting system comprises:
a lead frame able to be electrically connected to said system for supplying electrical power, said lead frame including at least one connecting terminal; and
at least one connecting means allowing said at least one connecting terminal of said lead frame to be electrically connected to said at least one light source;
said at least one connecting terminal and said at least one connecting means being able to electrically connect said at least one light source to said lead frame, thereby allowing said at least one light source to be placed away from said lead frame.
2. The system as claimed in claim 1, wherein said lead frame includes a first means for dissipating heat allowing the heat generated by said lead frame to be dissipated.
3. The system as claimed in claim 2, wherein said first means for dissipating heat is a resistive circuit.
4. The system as claimed in claim 1, wherein said lead frame includes a converter allowing the, especially AC, voltage of the current delivered by said system for supplying electrical power to be converted into an, especially DC, voltage applied to said at least one connecting terminal of said lead frame.
5. The system as claimed in claim 1, wherein said lead frame includes a control circuit that controls said voltage of said current applied to said at least one connecting terminal.
6. The system as claimed in claim 1, wherein said at least one connecting terminal of said lead frame is a connecting pad able to allow said at least one light source to be connected by application of the wire bonding technique.
7. The system as claimed in claim 1, wherein said at least one connecting means is an electrically conductive wire.
7. The system as claimed in claim 1, where said lead frame comprises a printed circuit board to which electronic components may be connected.
9. The system as claimed in claim 8, wherein said lead frame comprises a border extending perpendicularly from said printed circuit board, said border including:
two substantially parallel longitudinal walls; and
two substantially parallel transverse walls, which each connect said two longitudinal walls.
10. The system as claimed in claim 9, wherein said border and said printed circuit board define a seal-tight tray, said tray being filled with a liquefied plastic product.
11. The system as claimed in claim 8, wherein one of said longitudinal walls of said border comprises a recess in which said at least one connecting terminal is placed.
12. The system as claimed in claim 8, wherein one of said transverse walls of said border comprises on its external face a protruding housing the walls of which extend substantially perpendicular to said transverse wall, said lead frame including at least one electrical connector placed in said housing, said at least one electrical connector allowing said lead frame to be connected to said system for supplying electrical power.
13. A light-emitting assembly, wherein said assembly comprises:
a system for electrically connecting said at least one light source to said system for supplying electrical power according to claim 1;
said at least one light source; and
a second means for dissipating heat allowing the heat generated by said at least one light source to be dissipated, said second means for dissipating heat being disconnected from said lead frame.
14. The assembly as claimed in claim 13, wherein said at least one light source is a light-emitting diode.
15. The assembly as claimed in claim 13, wherein said second means for dissipating heat is a holder of said at least one light source.
16. A lighting and/or signaling device for an automotive vehicle, wherein said device includes said light-emitting assembly according to claim 13.
17. The system as claimed in claim 2, wherein said lead frame includes a converter allowing the, especially AC, voltage of the current delivered by said system for supplying electrical power to be converted into an, especially DC, voltage applied to said at least one connecting terminal of said lead frame.
18. The system as claimed in claim 3, wherein said lead frame includes a converter allowing the, especially AC, voltage of the current delivered by said system for supplying electrical power to be converted into an, especially DC, voltage applied to said at least one connecting terminal of said lead frame.
19. The system as claimed in claim 2, wherein said lead frame includes a control circuit that controls said voltage of said current applied to said at least one connecting terminal.
20. The system as claimed in claim 3, wherein said lead frame includes a control circuit that controls said voltage of said current applied to said at least one connecting terminal.
US15/027,309 2013-10-18 2014-10-17 System for the electrically connecting at least one light source to an electrical power supply system Abandoned US20160245474A1 (en)

Applications Claiming Priority (3)

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FR1360174 2013-10-18
FR1360174A FR3012204B1 (en) 2013-10-18 2013-10-18 SYSTEM FOR ELECTRICALLY CONNECTING AT LEAST ONE LIGHT SOURCE TO AN ELECTRICAL POWER SUPPLY SYSTEM
PCT/EP2014/072343 WO2015055827A1 (en) 2013-10-18 2014-10-17 System for the electrically connecting at least one light source to an electrical power supply system

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US16/594,465 Active US10865957B2 (en) 2013-10-18 2019-10-07 System for the electrically connecting at least one light source to an electrical power supply system
US16/951,534 Active US11353190B2 (en) 2013-10-18 2020-11-18 System for the electrically connecting at least one light source to an electrical power supply system

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US16/951,534 Active US11353190B2 (en) 2013-10-18 2020-11-18 System for the electrically connecting at least one light source to an electrical power supply system

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EP (1) EP3058273B1 (en)
JP (1) JP6509837B2 (en)
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EP3058273B1 (en) 2019-11-13
FR3012204B1 (en) 2015-10-30
CN111365677A (en) 2020-07-03
JP6509837B2 (en) 2019-05-08
US20200041105A1 (en) 2020-02-06
US11353190B2 (en) 2022-06-07
CN105659028A (en) 2016-06-08
EP3058273A1 (en) 2016-08-24
JP2016533621A (en) 2016-10-27
KR20160072118A (en) 2016-06-22
US20210071840A1 (en) 2021-03-11
US10865957B2 (en) 2020-12-15
FR3012204A1 (en) 2015-04-24
WO2015055827A1 (en) 2015-04-23

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