EP3246625B1 - Dispositif d'éclairage et procédé correspondant - Google Patents
Dispositif d'éclairage et procédé correspondant Download PDFInfo
- Publication number
- EP3246625B1 EP3246625B1 EP17167711.5A EP17167711A EP3246625B1 EP 3246625 B1 EP3246625 B1 EP 3246625B1 EP 17167711 A EP17167711 A EP 17167711A EP 3246625 B1 EP3246625 B1 EP 3246625B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- lighting device
- light radiation
- casing
- source
- radiation source
- 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
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Classifications
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- 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
- F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
- F21V29/50—Cooling arrangements
- F21V29/60—Cooling arrangements characterised by the use of a forced flow of gas, e.g. air
- F21V29/67—Cooling arrangements characterised by the use of a forced flow of gas, e.g. air characterised by the arrangement of fans
- F21V29/677—Cooling arrangements characterised by the use of a forced flow of gas, e.g. air characterised by the arrangement of fans the fans being used for discharging
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
- F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
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- 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
- F21V23/004—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 arranged on a substrate, e.g. a printed circuit board
- F21V23/006—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 arranged on a substrate, e.g. a printed circuit board the substrate being distinct from the light source holder
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- 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
- F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
- F21V29/50—Cooling arrangements
- F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
- F21V29/74—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades
- F21V29/77—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical diverging planar fins or blades, e.g. with fan-like or star-like cross-section
- F21V29/773—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical diverging planar fins or blades, e.g. with fan-like or star-like cross-section the planes containing the fins or blades having the direction of the light emitting axis
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- 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
- F21V7/00—Reflectors for light sources
- F21V7/04—Optical design
- F21V7/07—Optical design with hyperbolic curvature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
- F21W2131/00—Use or application of lighting devices or systems not provided for in codes F21W2102/00-F21W2121/00
- F21W2131/10—Outdoor lighting
- F21W2131/103—Outdoor lighting of streets or roads
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- 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
- F21Y2101/00—Point-like light sources
-
- 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
- F21Y2105/00—Planar light sources
- F21Y2105/10—Planar light sources comprising a two-dimensional array of point-like light-generating elements
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- 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 description relates to lighting devices.
- One or more embodiments may refer to lighting devices employing electrically-powered solid-state lighting sources, e.g. LED sources.
- One or more embodiments may find employment in LED-based high-power lighting systems, e.g. for street lighting applications.
- lighting devices employing solid-state light radiation sources, e.g. comprising a support board "populated" with an array of LED sources, produce a certain amount of heat which may be considerable in high-power light radiation sources.
- the support board carrying the LEDs may be coupled to a thermally conductive support adapted to dissipate heat (e.g. being configured as a finned heat sink) or, generally speaking, to remove heat, by transferring it towards a further component adapted to exchange energy with media having a lower temperature (e.g. radiators or the like).
- a thermally conductive support adapted to dissipate heat (e.g. being configured as a finned heat sink) or, generally speaking, to remove heat, by transferring it towards a further component adapted to exchange energy with media having a lower temperature (e.g. radiators or the like).
- the invention relates to a lighting device having the features set forth in the preamble of claim 1, which is known, e.g. from EP 1 741 975 A2 . Also documents US 2009/279301 A1 and EP 2 833 058 A1 are of interest for the invention.
- One or more embodiments aim at providing a solution enabling the dissipation of the heat produced by light radiation sources such as LED sources, while overcoming the previously outlined drawbacks.
- said object may be achieved thanks to a lighting device having the features specifically set forth in claim 1 that follows.
- One or more embodiments may envisage dissipating the heat produced by a light radiation source such as a LED source by resorting to an active component (such as a fan or a blower) adapted to act as a ventilation aeriform (e.g. air) pumping source, and sized so as to be arranged in the vicinity of the light radiation source(s), e.g. on the support board (e.g. a Printed Circuit Board, PCB) accommodating the light radiation source(s).
- a light radiation source such as a LED source
- an active component such as a fan or a blower
- a ventilation aeriform e.g. air
- said active component may be small-sized and adapted to be mounted onto the support board in a similar way as the light radiation sources are mounted thereon (e.g. via SMD mounting technologies).
- reference 10 denotes a lighting device comprising a casing 12, e.g. of a metal or moulded plastic material, optionally having good heat-dissipating features.
- casing 12 may have a general bowl-like shape, so as to be adapted to accommodate, e.g. centrally, a support board 14 e.g. substantially similar to a Printed Circuit Board (PCB).
- PCB Printed Circuit Board
- board 14 may have a circular shape, adapted to be mirrored by a substantially corresponding shape of casing 12.
- a circular shape adapted to be mirrored by a substantially corresponding shape of casing 12.
- the choice of such shape does not limit the embodiments in any way.
- support board 14 may host at least one light radiation source, e.g. an array of electrically-powered light radiation sources 16.
- the light radiation source(s) 16 may comprise solid-state light radiation sources, e.g. LED sources.
- the light radiation source (s) may be high-power sources, so that they may be employed e.g. in street lighting applications: the reference to this applicability must not however be construed as limiting the embodiments.
- Figure 1 also shows, mounted onto a further board 18 e.g. in the shape of a crescent, electronic components 20 adapted to perform supply and/or control functions on source(s) 16.
- a further board 18 e.g. in the shape of a crescent, electronic components 20 adapted to perform supply and/or control functions on source(s) 16.
- casing 12 may be externally provided with fins 120, adapted to favour heat dissipation from casing 12 towards the external environment.
- casing 12 may be associated with a (e.g. finned) heat sink 140, which in one or more embodiments is adapted to be placed in (wide) surface contact with board 14, so as to favour heat dissipation from board 14 itself.
- a heat sink 140 e.g. finned heat sink 140
- device 10 may comprise one or more aeriform (e.g. air) pumping sources 22, adapted to act onto board 14 in the vicinity of light radiation source(s) 16, in order to create a ventilation flow as schematically represented by arrows F in Figure 2 .
- aeriform e.g. air
- pumping source(s) 22 may be mounted onto support board 14 together with radiation source(s) 16.
- pumping source(s) 22 may be interspersed, e.g. at regular positions, in the array of light radiation sources 16.
- Figure 1 shows a possible embodiment having an array comprising several tens of light radiation sources 16, arranged according to a general octagonal configuration.
- Four pumping sources 22 may be provided and distributed around the central area of the array of light radiation sources 16, so that each pumping source 22 "covers" about one quarter of the arrayed light radiation sources 16.
- source(s) 22 are small-sized (both in the case of a fan and in the case of an e.g. centrifugal blower).
- Said sources may be mounted onto board 14 for example via technologies (e.g. SMD technologies) substantially similar to those used to mount sources 16 onto board 14.
- technologies e.g. SMD technologies
- casing 12 may host a reflector, and/or may be closed at the distal end thereof by a closing screen 24, through which the light radiation of sources 16 is projected towards the outside: the inner volume of casing 12 may thus be a closed space, within which the ventilation flow F takes place.
- the reflector may be received within casing 12 with a portion of casing 12 being external to the reflector.
- One or more embodiments may envisage, at the "proximal" light input end and/or at the “distal” light output end with reference to the reflector, the presence of ventilation openings or passageways, through which air may flow between the inner space and the outer space of the reflector, the latter being the portion of casing 12 outside the reflector.
- One or more embodiments may therefore envisage a solution wherein the light radiation source(s) 16 and the aeriform pumping source(s) 22 are arranged on support board 14, such pumping sources 22 being adapted to act directly on light radiation source(s) 16 and not on a heat sink.
- One or more embodiments may therefore operate according to a principle different from transferring heat from sources 16 towards board 14 and from the latter towards a heat sink such as 140.
- one or more embodiments involve moving the air in the vicinity of source(s) 16, therefore transferring heat from the close neighbourhood of board 14 to the other regions of casing 12, e.g. towards screen 24.
- the latter may optionally be a diffusive screen, or simply a screen adapted to protect device 10 against the penetration of external agents (e.g. having an IP protection degree).
- thermal energy may be transferred to the outside:
- the mechanism described herein - with an active role played by ventilation sources 22 - may therefore be used either alone or in hybrid solutions, wherein said mechanism may be added to traditional dissipating mechanisms (e.g. a finned heat sink associated with board 14, a finned casing, etc.) and may cooperate therewith.
- traditional dissipating mechanisms e.g. a finned heat sink associated with board 14, a finned casing, etc.
- ventilation sources 22 are adapted to be mounted onto board 14 in the same way as the other electrical components of device 10, in conditions which are practically invisible from the outside.
- This solution for transferring heat towards the outside is particularly beneficial e.g. in ceiling installations, e.g. with devices 10 adapted to act as downlights, in conditions wherein the convective action of a heatsink such as heatsink 140 may be poor.
- One or more embodiments may therefore be employed in environments which do not in themselves favour heat dissipation towards the outside, e.g. in the case of a device 10 mounted into a false ceiling.
- source(s) 22 may comprise (micro)fans or micro(blowers) available e.g. from SEPA Europe GmbH of Breisgau in Eschbach (Germany) or from Sunonweath Electric Machine Industry Co., Ltd. of Kaohsiung City, Taiwan.
Claims (12)
- Un dispositif d'éclairage (10), comprenant :- une carte support (14),- au moins une source de rayonnement lumineux alimentée électriquement (16) agencée sur ladite carte support (14),- au moins une source de pompage gazeux (22) active sur ladite carte (14) au voisinage de ladite au moins une source de rayonnement (16),- un boitier (12) entourant ladite au moins une source de rayonnement lumineux (16), ladite au moins une source de pompage (22) étant activable pour entrainer un flux d'air à l'intérieur dudit boitier (12), ledit boitier (12) comprenant un réflecteur entourant ladite au moins une source de rayonnement lumineux (16),caractérisé en ce que ladite au moins une source de rayonnement lumineux (16) et ladite au moins une source de pompage (22) sont agencées dans ledit réflecteur.
- Le dispositif d'éclairage (10) de la revendication 1, dans lequel ladite au moins une source de pompage (22) est agencée sur ladite carte support (14).
- Le dispositif d'éclairage (10) de la revendication 1 ou de la revendication 2, comprenant un réseau de sources de rayonnement lumineux alimentées électriquement (16) avec ladite au moins une source de pompage (22) intercalée dans ledit réseau.
- Le dispositif d'éclairage (10) de la revendication 3, comprenant une pluralité desdites sources de pompage (22) intercalées dans ledit réseau.
- Le dispositif d'éclairage (10) de l'une des revendications précédentes, dans lequel ladite au moins une source de pompage (22) comprend un ventilateur ou une soufflerie.
- Le dispositif d'éclairage (10) de l'une des revendications précédentes, dans lequel ladite au moins une source de pompage (22) est montée sur ladite carte (14) par montage CMS.
- Le dispositif d'éclairage (10) de l'une des revendications précédentes, comprenant un drain thermique (140) couplé à ladite carte support (14) à l'opposé de ladite au moins une source de rayonnement (16).
- Le dispositif d'éclairage (10) de l'une des revendications précédentes, comprenant un boitier (12) d'un type à ailettes (120).
- Le dispositif d'éclairage (10) de la revendication 1, dans lequel ledit boitier (12) comprend un écran frontal (24) fermant ledit boitier (12), ledit boitier (12) et ledit écran frontal (24) formant un espace clos autour de ladite au moins une source de rayonnement lumineux (16).
- Le dispositif d'éclairage (10) de la revendication 9, incluant la fermeture dudit réflecteur par ledit écran frontal (24).
- Le dispositif d'éclairage (10) de l'une d'entre la revendication 1 ou la revendication 10, comprenant un drain thermique (140) couplé audit réflecteur à l'opposé de ladite au moins une source de rayonnement lumineux (16).
- Le dispositif d'éclairage (10) de l'une des revendications 1, 10 et 11, comprenant, à l'extrémité d'entrée et/ou de sortie du réflecteur, des passages de ventilation entre le volume intérieur et le volume extérieur du réflecteur.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITUA20163479 | 2016-05-16 |
Publications (2)
Publication Number | Publication Date |
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EP3246625A1 EP3246625A1 (fr) | 2017-11-22 |
EP3246625B1 true EP3246625B1 (fr) | 2018-12-19 |
Family
ID=56940188
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17167711.5A Active EP3246625B1 (fr) | 2016-05-16 | 2017-04-24 | Dispositif d'éclairage et procédé correspondant |
Country Status (1)
Country | Link |
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EP (1) | EP3246625B1 (fr) |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1741975B1 (fr) * | 2005-07-05 | 2011-09-07 | Frowein EZH GmbH | Lampe chirurgicale |
TW200948257A (en) * | 2008-05-06 | 2009-11-16 | Asustek Comp Inc | Electronic device and heat dissipation unit thereof |
EP2833058B1 (fr) * | 2013-07-31 | 2016-09-07 | OSRAM GmbH | Ensemble de montage pour les dispositifs d'éclairage, dispositif d'éclairage et carte imprimée correspondantes |
-
2017
- 2017-04-24 EP EP17167711.5A patent/EP3246625B1/fr active Active
Non-Patent Citations (1)
Title |
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None * |
Also Published As
Publication number | Publication date |
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EP3246625A1 (fr) | 2017-11-22 |
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