EP2534414A1 - Led lighting apparatus with improved thermal dissipation - Google Patents

Led lighting apparatus with improved thermal dissipation

Info

Publication number
EP2534414A1
EP2534414A1 EP11701400A EP11701400A EP2534414A1 EP 2534414 A1 EP2534414 A1 EP 2534414A1 EP 11701400 A EP11701400 A EP 11701400A EP 11701400 A EP11701400 A EP 11701400A EP 2534414 A1 EP2534414 A1 EP 2534414A1
Authority
EP
European Patent Office
Prior art keywords
lighting apparatus
leds
supporting plate
led lighting
thermal dissipation
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.)
Granted
Application number
EP11701400A
Other languages
German (de)
French (fr)
Other versions
EP2534414B1 (en
Inventor
Carlotta De Bevilacqua
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.)
DE BEVILACQUA, CARLOTTA
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP2534414A1 publication Critical patent/EP2534414A1/en
Application granted granted Critical
Publication of EP2534414B1 publication Critical patent/EP2534414B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • 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
    • 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
    • F21V29/85—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems characterised by the material
    • F21V29/89—Metals
    • 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
    • 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
    • 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
    • F21Y2105/14—Planar light sources comprising a two-dimensional array of point-like light-generating elements characterised by the overall shape of the two-dimensional array
    • F21Y2105/16—Planar light sources comprising a two-dimensional array of point-like light-generating elements characterised by the overall shape of the two-dimensional array square or rectangular, e.g. for light panels
    • 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 an LED lighting apparatus with improved thermal dissipation.
  • LED lighting apparatuses which have the advantage of enabling a considerable energy saving, together with a considerable lifetime of the LEDs, are becoming increasingly common.
  • LEDs are particularly sensitive to heat levels, since at temperatures higher than 100°C the LEDs can be damaged, to the point where they fail permanently when a threshold of around 140°C is exceeded.
  • an object of the invention is to provide a lighting apparatus in which it is possible to use, for the LEDs, optical collimation systems that provide light beams with an aperture angle comparable with that of halogen light sources constituted by low-voltage lamps associated with aluminum reflectors for collimating the light beam.
  • Another object of the present invention is to provide a lighting apparatus that, thanks to its distinctive implementation characteristics, is capable of offering the widest guarantees of reliability and safety in use.
  • a further object of the present invention is to provide an LED lighting apparatus with improved thermal dissipation that can be easily made from elements and materials that are easily sourced on the market.
  • an LED lighting apparatus with improved thermal dissipation comprising a plate for supporting a plurality of LEDs which can be connected to an electric power source, characterized in that it comprises a heat sink constituted by a flat sheet made of thermally conducting material which is intimately associated with said supporting plate and protrudes beyond said supporting plate.
  • Figure 1 is a schematic perspective view of the lighting apparatus, according to the invention.
  • Figure 2 is a plan view of the lighting apparatus, seen from the side with the light sources;
  • Figure 3 is a side elevation view of the lighting apparatus.
  • the lighting apparatus generally indicated with the reference numeral 1, comprises a plate 2 for supporting a plurality of LEDs 3, which are provided with a conventional collimator, which are distributed on a relatively wide surface, according to a scheme which is basically determined by the dimensions of the lenses of the collimators which, typically, have a diameter of 20 mm or more.
  • the plate 2 is made of thermally conducting material which, advantageously, is constituted by an aluminum dissipation sheet that has a thermal conductibility that is measurable as 237 W/mK and, at the same time, is lower in cost than materials with higher thermal conductibility, such as, for example, copper or silver.
  • a heat sink which is constituted by a flat sheet 10, also made of thermally conducting material, such as aluminum, which is intimately connected to the supporting plate 2 by means of interposing a thermally conducting paste for minimizing thermal resistance between the two elements.
  • the experimental test was carried out with the apparatus arranged horizontally and in a clear area.

Landscapes

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

Abstract

LED lighting apparatus (1) with improved thermal dissipation comprising a plate (2) for supporting a plurality of LEDs (3) which can be connected to an electric power source, and a heat sink constituted by a flat sheet (10) made of thermally conducting material which is intimately associated with the supporting plate (2) and protrudes beyond the supporting plate (2).

Description

LED LIGHTING APPARATUS WITH IMPROVED THERMAL
DISSIPATION
Technical Field
The present invention relates to an LED lighting apparatus with improved thermal dissipation.
Background art
As is known, LED lighting apparatuses, which have the advantage of enabling a considerable energy saving, together with a considerable lifetime of the LEDs, are becoming increasingly common.
But a problem which is felt with these lighting sources consists in that
LEDs are particularly sensitive to heat levels, since at temperatures higher than 100°C the LEDs can be damaged, to the point where they fail permanently when a threshold of around 140°C is exceeded.
Current solutions which use LEDs couple them with thermal dispersion systems that are typically used for electronic components, such as computer microprocessors and the like, which are constituted by blocks of aluminum or copper that are formed with fins or needles in order to increase the dissipation of the heat from the rear of the component, thereby increasing the exposed surface.
This embodiment, while being valid in many ways, can be criticised with regard to the aesthetic appearance of the lighting apparatus, since the use of this dissipation technology perceptibly limits the freedom to obtain the final appearance of the lighting apparatus to be achieved.
Disclosure of the invention
The aim of the present invention is to solve the above mentioned problem, by providing an LED lighting apparatus with improved thermal dissipation, which makes it possible to maintain the functional structural integrity of the LEDs, by using particular heat sinks which make it possible to not impose particular limits on the designer in outlining the aesthetic appearance of the apparatus. Within this aim, an object of the invention is to provide a lighting apparatus in which it is possible to use, for the LEDs, optical collimation systems that provide light beams with an aperture angle comparable with that of halogen light sources constituted by low-voltage lamps associated with aluminum reflectors for collimating the light beam.
Another object of the present invention is to provide a lighting apparatus that, thanks to its distinctive implementation characteristics, is capable of offering the widest guarantees of reliability and safety in use.
A further object of the present invention is to provide an LED lighting apparatus with improved thermal dissipation that can be easily made from elements and materials that are easily sourced on the market.
This aim and these and other objects, which will become better apparent hereinafter, are achieved by an LED lighting apparatus with improved thermal dissipation, comprising a plate for supporting a plurality of LEDs which can be connected to an electric power source, characterized in that it comprises a heat sink constituted by a flat sheet made of thermally conducting material which is intimately associated with said supporting plate and protrudes beyond said supporting plate.
Brief description of the drawings
Further characteristics and advantages of the invention will become better apparent from the description of a preferred, but not exclusive, embodiment of an LED lighting apparatus with improved thermal dissipation, illustrated by way of non-limiting example in the accompanying drawings wherein:
Figure 1 is a schematic perspective view of the lighting apparatus, according to the invention;
Figure 2 is a plan view of the lighting apparatus, seen from the side with the light sources;
Figure 3 is a side elevation view of the lighting apparatus.
Ways of carrying out the invention With reference to the figures, the lighting apparatus, generally indicated with the reference numeral 1, comprises a plate 2 for supporting a plurality of LEDs 3, which are provided with a conventional collimator, which are distributed on a relatively wide surface, according to a scheme which is basically determined by the dimensions of the lenses of the collimators which, typically, have a diameter of 20 mm or more.
The plate 2 is made of thermally conducting material which, advantageously, is constituted by an aluminum dissipation sheet that has a thermal conductibility that is measurable as 237 W/mK and, at the same time, is lower in cost than materials with higher thermal conductibility, such as, for example, copper or silver.
In order to obtain the desired value of thermal dissipation, a heat sink is provided which is constituted by a flat sheet 10, also made of thermally conducting material, such as aluminum, which is intimately connected to the supporting plate 2 by means of interposing a thermally conducting paste for minimizing thermal resistance between the two elements.
With this arrangement it is possible to use a distribution of LED sources that is particularly advantageous with regard to the law of transmission of heat on a flat and parallel sheet, according to which the power transmitted by conduction is directly proportional to the area of the surface and to the difference in temperature between the faces of the sheet and is inversely proportional to the thickness of the sheet.
With this embodiment, it is possible to provide a heat sink that extends along a plane and therefore does not create particular restrictions in the aesthetic interpretation of the light, but which in any case makes it possible to obtain the desired degree of thermal dissipation.
From experimental tests it has been found that, using an aluminum sheet measuring 150x150 mm2 with a thickness of 3 mm for the heat sink, a junction temperature of 92°C of the LED is obtained with an ambient temperature of 25°C, having 12 LEDs in series with a power of 19.5 W, while the temperature is 81°C for 9 LEDs in series with a power of 14.5 W.
The experimental test was carried out with the apparatus arranged horizontally and in a clear area.
From the foregoing it can thus be seen that the adopted solution of having the plate supporting the LEDs made of thermally conducting material and intimately connected to a heat sink which is flat in shape makes it possible, by using a inexpensive material like aluminum, to achieve optimal results in terms of the temperatures that can be obtained during operation.
The invention, thus conceived, is susceptible of numerous modifications and variations, all of which are within the scope of the appended claims.
In addition, all the details may be replaced by other, technically equivalent elements.
In practice the materials employed, provided they are compatible with the specific use, as well as the dimensions and the contingent shapes, may be any according to the requirements.
The disclosures in Italian Patent Application No. MI2010A000185 from which this application claims priority are incorporated herein by reference.
Where technical features mentioned in any claim are followed by reference signs, those reference signs have been included for the sole purpose of increasing the intelligibility of the claims and accordingly such reference signs do not have any limiting effect on the interpretation of each element identified by way of example by such reference signs.

Claims

1. An LED lighting apparatus (1) with improved thermal dissipation, comprising a plate (2) for supporting a plurality of LEDs (3) which can be connected to an electric power source, characterized in that it comprises a heat sink constituted by a flat sheet (10) made of thermally conducting material which is intimately associated with said supporting plate (2) and protrudes beyond said supporting plate (2).
2. The lighting apparatus according to claim 1, characterized in that said supporting plate (2) is made of thermally conducting material.
3. The lighting apparatus according to one or more of the preceding claims, characterized in that it comprises, between said supporting plate (2) and said flat sheet (10), a thermally conducting paste for minimizing thermal resistance.
4. The lighting apparatus according to claim 1 , characterized in that said supporting plate (2) and said flat sheet (10) are made of aluminum.
5. The lighting apparatus according to one or more of the preceding claims, characterized in that said LEDs (3) are mutually spaced by a distance that is at least equal to the dimensions of the collimators connected to each one of said LEDs (3).
EP11701400.1A 2010-02-08 2011-01-28 Led lighting apparatus with improved thermal dissipation Active EP2534414B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI2010A000185A IT1398066B1 (en) 2010-02-08 2010-02-08 LED LIGHTING UNIT WITH IMPROVED THERMAL DISSIPATION.
PCT/EP2011/051207 WO2011095438A1 (en) 2010-02-08 2011-01-28 Led lighting apparatus with improved thermal dissipation

Publications (2)

Publication Number Publication Date
EP2534414A1 true EP2534414A1 (en) 2012-12-19
EP2534414B1 EP2534414B1 (en) 2025-04-09

Family

ID=42313955

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11701400.1A Active EP2534414B1 (en) 2010-02-08 2011-01-28 Led lighting apparatus with improved thermal dissipation

Country Status (3)

Country Link
EP (1) EP2534414B1 (en)
IT (1) IT1398066B1 (en)
WO (1) WO2011095438A1 (en)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040190305A1 (en) * 2003-03-31 2004-09-30 General Electric Company LED light with active cooling
US20070086196A1 (en) * 2005-10-18 2007-04-19 National Tsing Hua University Heat dissipation devices for and LED lamp set
US20070133203A1 (en) * 2005-12-14 2007-06-14 Chuen-Shing Chen Water-resistant illumination apparatus
US20070165405A1 (en) * 2006-01-19 2007-07-19 Chuen-Shing Chen Water-resistant illumination apparatus
CN201050705Y (en) * 2007-02-02 2008-04-23 深圳市光伏能源科技有限公司 High light LED illuminator
EP2085683A1 (en) * 2006-11-13 2009-08-05 Hong-Yuan Technology Co., Ltd. Light emitting system
US20090268476A1 (en) * 2008-04-23 2009-10-29 Fu Zhun Precision Industry (Shen Zhen) Co., Ltd. Led lamp having a vapor chamber for dissipating heat generated by leds of the led lamp

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201284961Y (en) * 2008-10-24 2009-08-05 河北沐天太阳能科技发展有限公司 LED road lamp with large irradiation area
CN101566329B (en) * 2008-11-17 2011-06-15 常州雷德半导体科技有限公司 Method for applying ultravacuum heat sink to modular high-power LED street lamp
CN201382290Y (en) * 2009-04-10 2010-01-13 南京汉德森科技股份有限公司 LED down lamp with glare-proof structure

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040190305A1 (en) * 2003-03-31 2004-09-30 General Electric Company LED light with active cooling
US20070086196A1 (en) * 2005-10-18 2007-04-19 National Tsing Hua University Heat dissipation devices for and LED lamp set
US20070133203A1 (en) * 2005-12-14 2007-06-14 Chuen-Shing Chen Water-resistant illumination apparatus
US20070165405A1 (en) * 2006-01-19 2007-07-19 Chuen-Shing Chen Water-resistant illumination apparatus
EP2085683A1 (en) * 2006-11-13 2009-08-05 Hong-Yuan Technology Co., Ltd. Light emitting system
CN201050705Y (en) * 2007-02-02 2008-04-23 深圳市光伏能源科技有限公司 High light LED illuminator
US20090268476A1 (en) * 2008-04-23 2009-10-29 Fu Zhun Precision Industry (Shen Zhen) Co., Ltd. Led lamp having a vapor chamber for dissipating heat generated by leds of the led lamp

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2011095438A1 *

Also Published As

Publication number Publication date
IT1398066B1 (en) 2013-02-07
ITMI20100185A1 (en) 2011-08-09
WO2011095438A1 (en) 2011-08-11
EP2534414B1 (en) 2025-04-09

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