EP3232123B1 - Éclairage en plastique à cem améliorée - Google Patents

Éclairage en plastique à cem améliorée Download PDF

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Publication number
EP3232123B1
EP3232123B1 EP17165907.1A EP17165907A EP3232123B1 EP 3232123 B1 EP3232123 B1 EP 3232123B1 EP 17165907 A EP17165907 A EP 17165907A EP 3232123 B1 EP3232123 B1 EP 3232123B1
Authority
EP
European Patent Office
Prior art keywords
metal layer
electrical components
luminaire according
luminaire
plastic
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.)
Active
Application number
EP17165907.1A
Other languages
German (de)
English (en)
Other versions
EP3232123A1 (fr
Inventor
Christoph Hofinger
Simon Koebinger
Susanne Maria Wimmer
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.)
Osram SBT GmbH
Original Assignee
Siteco Beleuchtungstechnik GmbH
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 Siteco Beleuchtungstechnik GmbH filed Critical Siteco Beleuchtungstechnik GmbH
Publication of EP3232123A1 publication Critical patent/EP3232123A1/fr
Application granted granted Critical
Publication of EP3232123B1 publication Critical patent/EP3232123B1/fr
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Classifications

    • 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
    • F21V15/00—Protecting lighting devices from damage
    • F21V15/01—Housings, e.g. material or assembling of housing parts
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]

Definitions

  • the present invention relates to a luminaire with a plastic luminaire housing, which provides a device carrier for electrical components.
  • Luminaires with plastic housing can be produced particularly cost-effective and also offer the ability to easily produce moisture-proof housing.
  • plastic housings have the disadvantage that they do not shield electrically. This may result, in particular in the case of light-emitting means in the form of LEDs (by which any type of semiconductor light sources, including organic LEDs, is understood) from emitting high-frequency radiation from the luminaire and being directed to other devices, e.g. on screens, negatively affects.
  • the limitation of electromagnetic radiation is also referred to as the electromagnetic compatibility (EMC) of the device.
  • plastic housing have the disadvantage that they can dissipate the heat produced by the operation of the lamps or other electrical components worse than a metal housing, because the thermal conductivity of plastic compared to metal is much lower.
  • the lighting unit has an LED on a carrier plate, which is arranged in a housing of the lighting unit.
  • the housing has an electrically conductive layer in the interior.
  • the motor vehicle headlamp comprises a light source and a reflector.
  • a metal coating is provided and serves to reflect the light emitted by the light source and on the other hand also for shielding EMC interference.
  • US 2007/242 461 A1 discloses a lighting device based on an LED.
  • LEDs are arranged on a heat sink, wherein the heat sink as well as faradaysche shield to suppress electromagnetic radiation acts.
  • the object of the present invention is to improve the electromagnetic compatibility and the thermal management in lamps of the type mentioned.
  • the metal layer fulfills two tasks. By arranging the electrical components, in particular also the lighting means, on the metal layer, the metal layer and the electrical components act together as a capacitor. As a result, high-frequency currents, which occur for example in driver circuits for LEDs or other bulbs, effectively prevented.
  • electrical components for suppression for example inductors or capacitors, provided in the lead of the lamp to improve the electromagnetic compatibility. As a rule, this is no longer necessary in the inventive concept by the metal layer. Furthermore, the metal layer still has the advantage that it dissipates the heat of the electrical equipment.
  • the metal layer is formed by a metal foil.
  • the metal foil can simply be inserted into the housing. It is merely a preferably flat layer provided. It has been found that it is not necessary to line the entire housing in the manner of a Faraday cage. It is sufficient if, according to the invention, only one metal layer is provided between the housing carrier made of plastic and the electrical components, because this cooperates in the manner of a capacitor with the electrical components.
  • all the electrical components of the luminaire are arranged on a single metal layer, whereby all components are capacitively coupled.
  • the metal foil is integrally formed. This ensures a good electrical connection between all sections of the metal layer. But it can also be a assembled metal foil are applied, wherein the portions of the metal foil overlap so that they are in electrical contact with each other.
  • the metal layer may also be formed by a metallic coating on a plastic surface of the device carrier.
  • the metallic coating can be applied, for example, by vapor deposition on the plastic surface.
  • the thickness of the metal layer e.g. B. as a film or coating, less than 0.2 mm. This strength is already sufficient to produce the desired capacitive coupling.
  • the electrical components comprise one or more ballasts for the light sources, in particular for LEDs. These ballasts tend to generate high-frequency noise, which can be prevented by the capacitive coupling with the metal layer according to the invention.
  • the electrical components further comprise one or more printed circuit boards with light sources arranged thereon, in particular LEDs.
  • the ballasts and the electrical circuit boards are arranged with the lighting means on the metal layer on the equipment carrier. This can reduce interference from all electrical components in the luminaire.
  • the planar connection has the advantage that good thermal contact is also formed between the electrical components and the metal layer, so that the metal layer can effectively dissipate the heat generated by the electrical components during operation.
  • the insulating layer is preferably formed by a thin film in order to minimize the thermal resistance between electrical components and the metal layer.
  • a thermal compound for increasing the thermal conductivity between the electrical components and the metal layer may be provided.
  • the metal layer has one or more cut-outs in areas in which metallic light-guiding elements are arranged adjacent to the equipment carrier. Contact between metallic light-directing elements and the metal layer can lead to unwanted corrosion by the various metals. Further, the metallic light directors would also degrade the insulation with respect to withstand voltage. The function of the metal layer for shielding could also deteriorate. Therefore, preferably the areas in the metal layer are recessed, at which the metallic Lichtlenkkomponenten could come into contact with the metal layer. In the remaining area of the device carrier, however, the metal layer is provided continuously, preferably without gaps, in order to ensure a good capacitive coupling of the electrical components.
  • the metal layer is not grounded. Earthing is not necessary since the function of the metal layer for capacitive coupling with electronic components is already sufficient to provide the necessary shielding to increase the electromagnetic compatibility. A grounding could even favor the emission of interfering signals again.
  • the metal layer is formed of copper. Copper is preferred because of its high electrical conductivity. Alternatively, aluminum may also be provided, for example.
  • FIG. 1 shows a plan view of a lamp housing in the open state.
  • the lamp has a plastic housing, such as PMMA or PU, of which in FIG. 1 only the bottom is shown. It should be understood that another cover is applied to the luminaire, which in FIG. 1 but not shown for clarity.
  • the plastic housing provides with the bottom side on the pointing into the interior of the lamp surface a device carrier 2 available on which all electrical components of the lamp are mounted.
  • printed circuit boards 4 are provided with LEDs arranged thereon.
  • three printed circuit boards 4 are arranged parallel to each other on the equipment carrier 2.
  • Reflectors 6 in the form of lamellar reflectors are provided over the circuit boards. In FIG. 1 For clarity, only two printed circuit boards 4 are shown with reflector 6, while the circuit board 4 is shown in the lower row without a reflector.
  • ballast 8 further electrical components in the form of a ballast 8 are arranged on the equipment carrier 2.
  • a ballast 8 is disposed between the two upper circuit boards 4. It should be understood, however, that even more electrical components, in particular a further ballast, can be arranged between the two lower circuit boards 4 on the equipment carrier 2.
  • All electrical components i. in particular the printed circuit boards 4 and the ballasts 8, are arranged on a continuous metal layer 10, which is located between the equipment carrier 2 and the electrical components.
  • the metal layer 10 is formed in the illustrated embodiment by a single contiguous copper metal foil.
  • the metal layer 10 is not grounded and also not galvanically coupled to the other electrical components in the housing.
  • 4 electrical insulating layers are provided in particular under the circuit boards or the circuit boards themselves are not conductive on the metal layer facing side to prevent galvanic contact between tracks on the circuit board 4 and the metal layer.
  • All electrical components in the illustrated embodiment are arranged flat on the metal layer 10, so that the electrical components on the Metal layer 10 are capacitively coupled. This has the effect that high-frequency interference signals, which could occur in particular in ballasts, are effectively short-circuited by the capacitive coupling and thereby prevented. Furthermore, a good thermal contact is formed by the flat support.
  • the metal layer 10 which is formed by a continuous film, further has cutouts 12, which extend along the edges of the reflectors 6. This prevents a reflector 6 from coming into contact with the metal layer 10. Such contact would lead to corrosion and may also have a negative effect on the electromagnetic shielding.
  • the metal layer 10 i. in the present case, the metal foil, formed by a coherent layer. This ensures a good electrical connection to the capacitive coupling of all electrical components in the luminaire housing.
  • the metal foil may also be formed by a metallic coating of the device carrier.
  • a larger or a smaller number of electrical components, in particular printed circuit boards for lighting means, can be provided in the housing, which are all capacitively coupled via a continuous metal layer.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)

Claims (9)

  1. Luminaire avec un boîtier de luminaire, qui est formé au moins partiellement d'une matière plastique, et un tronçon du boîtier fournit un support d'appareil (2) en matière plastique pour des composants électriques du luminaire,
    une couche métallique (10) étant disposée entre le support d'appareil (2) et plusieurs des composants électriques, les composants électriques comprenant un ou plusieurs ballasts (8) pour des moyens d'éclairage.
  2. Luminaire selon la revendication 1, la couche métallique (10) étant formée d'une feuille métallique.
  3. Luminaire selon la revendication 2, la feuille métallique étant formée d'une seule pièce.
  4. Luminaire selon la revendication 1, la couche métallique (10) étant formée d'un revêtement métallique d'une surface en matière plastique du support d'appareil.
  5. Luminaire selon l'une des revendications précédentes, les composants électriques comprenant un ou plusieurs circuits imprimés (4) sur lequel/lesquels sont disposés des moyens d'éclairage, en particulier des LED.
  6. Luminaire selon l'une des revendications précédentes, les composants électriques étant adjacents sur toute leur surface à la couche métallique (10), mais de préférence isolés électriquement.
  7. Luminaire selon l'une des revendications précédentes, la couche métallique (10) comportant une ou plusieurs découpes (12) dans des zones dans lesquelles des éléments de guidage de lumière (6) métalliques sont disposés de façon contiguë au support d'appareil (2).
  8. Luminaire selon l'une des revendications précédentes, la couche métallique (10) n'étant pas mise à la terre.
  9. Luminaire selon l'une des revendications précédentes, la couche métallique (10) étant formée de cuivre.
EP17165907.1A 2016-04-13 2017-04-11 Éclairage en plastique à cem améliorée Active EP3232123B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102016106876.4A DE102016106876A1 (de) 2016-04-13 2016-04-13 Kunststoffleuchte mit verbesserter EMV

Publications (2)

Publication Number Publication Date
EP3232123A1 EP3232123A1 (fr) 2017-10-18
EP3232123B1 true EP3232123B1 (fr) 2019-01-02

Family

ID=58544794

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17165907.1A Active EP3232123B1 (fr) 2016-04-13 2017-04-11 Éclairage en plastique à cem améliorée

Country Status (2)

Country Link
EP (1) EP3232123B1 (fr)
DE (1) DE102016106876A1 (fr)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7784969B2 (en) * 2006-04-12 2010-08-31 Bhc Interim Funding Iii, L.P. LED based light engine
DE102009016876B4 (de) * 2009-04-08 2019-09-05 Osram Gmbh Beleuchtungseinheit für Fahrzeugscheinwerfer und Fahrzeugscheinwerfer
DE102009031410A1 (de) * 2009-07-02 2011-01-05 Automotive Lighting Reutlingen Gmbh Beleuchtungseinrichtung für ein Kraftfahrzeug

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP3232123A1 (fr) 2017-10-18
DE102016106876A1 (de) 2017-10-19

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