IES20100521A2 - An LED lamp - Google Patents
An LED lampInfo
- Publication number
- IES20100521A2 IES20100521A2 IE20100521A IES20100521A IES20100521A2 IE S20100521 A2 IES20100521 A2 IE S20100521A2 IE 20100521 A IE20100521 A IE 20100521A IE S20100521 A IES20100521 A IE S20100521A IE S20100521 A2 IES20100521 A2 IE S20100521A2
- Authority
- IE
- Ireland
- Prior art keywords
- housing
- circuit board
- fan
- leds
- led lamp
- Prior art date
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
- F21V29/502—Cooling arrangements characterised by the adaptation for cooling of specific components
- F21V29/507—Cooling arrangements characterised by the adaptation for cooling of specific components of means for protecting lighting devices from damage, e.g. housings
-
- 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
- F21K9/20—Light sources comprising attachment means
- F21K9/27—Retrofit light sources for lighting devices with two fittings for each light source, e.g. for substitution of fluorescent tubes
-
- 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
- F21K9/60—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
- F21K9/69—Details of refractors forming part of the light source
-
- 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
-
- 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
- F21V29/83—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks the elements having apertures, ducts or channels, e.g. heat radiation holes
-
- 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
- F21V5/00—Refractors for light sources
- F21V5/007—Array of lenses or refractors for a cluster of light sources, e.g. for arrangement of multiple light sources in one plane
-
- 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
-
- 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]
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Optics & Photonics (AREA)
- Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
Abstract
An LED lamp comprises an electrically insulating housing having a front panel including a plurality of lenses. a circuit board is mounted inside the housing and has one major surface facing and spaced from the fromt panel and a plurality of high power LEDs mounted on the one major surface of the circuit board each in register with a respective lens. A fan is mounted in the housing on the opposite side of the circuit board to the LEDs and adjacent to a fan port in the rear of the housing. At least one aperture in and/or at the edge of the circuit board allows air to pass from behind the circuit board to in front of the circuit board, and at least one ventilation hole in the housing. The housing has external electrical contacts connected to the circuit board and to the fan for powering the LEDs and the fan from an external supply so that, in use, the fan circulates air through the housing between the fan port and the ventilation hole(s) via the aperture(a) in or at the edge of the circuit board.
Description
n LED (light emitting diode) lamp. The invention is particularly, but not exclusively, applicable to a mains-powered LED lamp which can serve as a retrofit replacement for a J-type linear tungsten halogen lamp in outdoor floodlights and which uses high power LEDs. In the present context a high power LED is an LED which is designed to operate at greater than 20 Volts, most usually .
at 50-250 Volts.
The J type linear tungsten halogen lamp works with indoor, and outdoor luminaires with R7 (s) or Rx7 (s) lampholders. .: This lamp has a luminous efficacy of only 10-20 lumens per 15 watt of energy consumed which, in today's terms, is fairly inefficient. The lamp life of the standard lamp is also low at only 2000-3000 hours, which brings its own maintenance issues .
One clean/green energy efficient lamp that will fit into a luminaire that uses a J-Type lamp is a compact fluorescent (CFL) version, for example as described in European patent publication no. EP 2,037,483. This has its own issues as it is bulky, with the bulb constructed form glass which can lead to easy breakage; mercury, a hazardous substance, may also be contained within the tube. The CFL version, does not lend itself to work efficiently inside an outdoor J-Type luminaire as it physically blocks the light being reflected from the integral reflector normally present. So, although the unit lumens/watt look impressive when not installed, the actual lumens delivered from the luminaire per watt is much less impressive.
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Also, the CFL bulbs take a long time to heat up and
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IE 10 reach their maximum illumination level.
Alterantively, both the Landlite model LED-F118-10W and
Ningbo Zhongrui Import & Export Co., Ltd. model J118/J189 5W/12W LED R7S bulb comprise LED based J-type lamps, however, these do not include a fan.
Hong Kong publication no. 1133533A provides a LED lamp with 10 an external fan suitable for a J-type light fitting.
However, the overall package has a difficult external profile and although the fan may be easily repaired, because it projects, from the assembly, it can be prone to damage and because, of. its location, the fan may not
-regulate temperature satisfactorily.
According to the present invention there is provided an LED lamp comprising an electrically insulating housing having a front panel including a plurality of lenses, a circuit board mounted inside the housing and having one major surface facing and spaced from the front panel, a plurality of high power LEDs mounted on the one major surface of the circuit board each in register with a respective lens, a fan mounted in the housing on the opposite side of the circuit board to the LEDs and adjacent to a fan port in the rear of the housing, at least one aperture in and/or at the edge of the circuit board to allow air to pass from behind the circuit board to in front of the circuit board, and at least one ventilation hole in the housing, the housing having external electrical contacts connected to the circuit board and to the fan for powering the LEDs and the fan from an external supply so that, in use, the fan circulates air through the housing between the fan port and
3100 5 21 is1OoS2 the ventilation hole(s) via the aperture(s) in or at the edge of the circuit board.
Preferably the at least one aperture and the at least one ventilation hole are arranged such that in use air flows laterally across the LEDs.
In an embodiment there are a plurality of apertures in the circuit board and a plurality of ventilation holes in the housing laterally of LEDs.
The housing may have the electrical contacts at opposite ends and a length and shape enabling the lamp, .to be located within a J-type light fitting.
An embodiment of the invention will now be described, by way of example, with reference to the accompanying drawings, in which:
Figure 1 is a front perspective view of an LED lamp according to the embodiment of the invention.
Figure 2 is a rear view of the lamp.
Figure 3 is a schematic cross-section through the line III-III of Figure 2.
A mains-powered LED lamp comprises an electrically insulating housing 10, generally of rectilinear form, made from two half-shells 12a, 12b which are secured together by screws 14. The half-shells 12a, 12b are moulded from a heat resistant electrically insulating plastics material, and when they are secured together a panel 16 which forms the is retained in position by the edges of the panel. The front a transparent electrically as a glass or a heat resistant plastics material, formed integrally may be separately flanges 12c which embrace panel 16 is a moulding of insulating material, such incorporating a 2x4 array of lenses 36 in the moulding. Alternatively the lenses formed and individually mounted in the front panel.
A PCB (printed circuit board) 18 is mounted inside the housing 10 substantially parallel to the front panel 16 so that one major surface 20 of the PCB faces towards and is spaced from the front panel 16. The PCB 18 occupies . substantially the full cross-sectional area of the. housing 10, so dividing the interior of the housing into two chambers, one chamber 22 in front of the PCB and one chamber 24 behind the PCB.
A 2x4 array of high power LEDs 26 is mounted on the surface 20 of the PCB 18, each LED 26 being in register with a respective lens 36 so that each LED can emit light directly forwardly through its associated lens. A cylindrical rotary electric fan 28 with fan blades 30 is mounted in the housing chamber 24 on the opposite side of the PCB to the LEDs 26 immediately in front of and in register with a fan port 32 in the rear wall 34 of the housing 10.
The PCB 18 includes a plurality of perforations 38 extending between the two internal housing chambers 22, 24. Also, a series of ventilation holes 40 are formed in and around the sidewalls of the housing 10 forwardly of the major surface 20 of the PCB 18. The edges of the front panel 16 may also, or alternatively, include ventilation
S10 0 5 21 holes 42. Indeed the panel 16 itself may include I ventilation holes.
It will be appreciated that the number of arrangement of LEDs 26 and ventilation holes 40 can be varied as required, for example, using a 4x3 array and more ventilation holes.
At opposite ends the housing 10 has a pair of externally accessible electrical contacts 44 connected internally of the housing to the PCB 18 and the fan 28 for simultaneously powering the LEDs 26 and the fan from an external mains supply. The PCB 18 preferably, but not necessarily, includes LED/fan control circuitry of the type described in Irish Patent Application No. S2010/0103 (Msemicon Taighde · Teoranta). The housing 10 with the electrical contacts .44· at opposite .ends preferably has a length and shape enabling the lamp to be located within a J-type light fitting, so enabling the lamp to serve as a retrofit replacement for a J-type linear tungsten halogen lamp in outdoor, floodlights.
In use the fan 28 cools the LEDs 26 by circulating air through the housing 10 between the fan port 32 and the ventilation holes 40 and/or 42 via the perforations 38 in the PCB 18, the direction of the air flow being dependent on the direction of rotation of the fan. The air flows laterally across the surfaces of the LEDs 26 to cool them, as indicated by the arrows in Figure 3 (the direction of the arrows assumes that the fan 28 draws air in through the port 32 - if the fan is reversed the air flow will be laterally inwardly across the LEDs).
In Figure 3 the fan 28 is shown mounted directly on or immediately adjacent to the PCB 18, so that air is forced
IE 10 ο 5 2 1 S100521 ’ S40105Μ directly through the perforations 38 into the front chamber 22 by the fan (or drawn out of the front chamber, according to the direction of fan rotation). However, more generally, the requirement is to cause air to flow through the front chamber 22, preferably laterally across the LEDs. This can be achieved in various ways. For example, if the fan 28 is not mounted so as to force air directly through the perforations 38, e.g. if it is spaced from the PCB 18, this requirement can nevertheless be achieved by making the PCB 18 occupy substantially the full cross-sectional area of the housing 10 so that the air is forced to pass entirely or at least preferentially through the .perforations 38. Alternatively, and again where the fan.28 is spaced from the PCB, instead of the perforations 38 in the PCB .18 there could be apertures (not shown) at the edges of the PCB, i.e. between it and the inside walls of the housing 10, and instead of the air vents 40 and/or 42 there could be one or more air vents (also not shown) in the central reg.ion of the front plate 16, so that cooling air passes round the edges of the PCB and, assuming the direction of air flow is towards the front, exits through the central vent in the front panel. Again, the cooling air passes laterally across the surfaces of the LEDs 26.
Important advantages of the embodiment are:
- The electronic circuit within the lamp (e.g. of the type described in Irish Patent Application No. S2010/0103) allows for a very compact and low cost device, and a forced cooled solution that does not require a separate and distinct power supply to run an integral fan. This electronic circuit allows the fan to operate internally
IE 1 0 0 5 2 1
S100521 &2ΐΓΠ)521 inside the lamp housing so that the lamp is able to fit inside an outdoor floodlight.
- The lamp can use high voltage LEDs that are relatively new to the market.
- The front lens panel is designed to obtain the optimum light output from the device without the use of the existing reflector housed in the outdoor luminaire. The lens projects light forward and out of the assembly and minimises stray light leakage.
- The lamp will, in principle, give 10 times the lamp life . of a standard J-Type halogen lamp with a 90+% energy savings .
- It is physically . far more robust than a CFL bulb.
- It will illuminate immediately, and will not have the characteristic slow turn on of a CFL bulb.
The invention is not limited to the embodiments described herein which may be modified or varied without departing from the scope of the invention.
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The following claims were filed on 18th August 2011
Claims (4)
1. An LED lamp comprising an electrically insulating housing having a front panel including a plurality of lenses, a circuit board mounted inside the housing and having one major surface facing and spaced from the front panel, a plurality of high power LEDs mounted on the one major surface of the circuit board each in register with a respective lens, a fan mounted in the housing on the opposite side of the circuit board to the LEDs and adjacent to a fan port in the rear of the housing, at least one aperture in and/or at the edge of the circuit board to allow air to pass from behind the circuit board to in front of the circuit board, and at least one ventilation hole in the housing, the housing having external electrical contacts connected to the circuit board and to the fan for powering the LEDs and the fan from an external supply so that, in use, the fan circulates air through the housing between the fan port and the ventilation hole(s) via the aperture(s) in or at the edge of the circuit board.
2. An LED lamp according to claim 1 wherein the at least one aperture and the at least one ventilation hole are arranged such that in use air flows laterally across the LEDs.
3. An LED lamp according to claim 1 or 2 comprising a plurality of apertures in the circuit board and a plurality of ventilation holes in the housing laterally of LEDs.
4. An led lamp according to any previous claim in which the housing has the electrical contacts at opposite ends of IE 1 0 0 52 1 9 the housing and a length and shape enabling the lamp to be located within a J-type light fitting.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IE20100521A IES20100521A2 (en) | 2010-08-24 | 2010-08-24 | An LED lamp |
| GB1114210.6A GB2483146B (en) | 2010-08-24 | 2011-08-18 | An led lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IE20100521A IES20100521A2 (en) | 2010-08-24 | 2010-08-24 | An LED lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| IES20100521A2 true IES20100521A2 (en) | 2012-02-29 |
Family
ID=44800489
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| IE20100521A IES20100521A2 (en) | 2010-08-24 | 2010-08-24 | An LED lamp |
Country Status (2)
| Country | Link |
|---|---|
| GB (1) | GB2483146B (en) |
| IE (1) | IES20100521A2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102013103024B4 (en) * | 2013-03-25 | 2019-05-23 | Vossloh-Schwabe Optoelectronic Gmbh & Co. Kg | LED module with ventilation and degassing device |
| CN204459812U (en) * | 2014-11-25 | 2015-07-08 | 深圳市亮维光电有限公司 | A kind of full visual angle LED light source of replaceable J-type cast Halogen lamp LED |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007265892A (en) * | 2006-03-29 | 2007-10-11 | Yuki Enterprise:Kk | Bulb type led lamp |
| WO2008037940A1 (en) * | 2006-09-26 | 2008-04-03 | Ghollam Tahmosybayat | Lamp assembly |
| CN201221748Y (en) * | 2008-05-13 | 2009-04-15 | 陈志雄 | High-power LED lamp |
| CN201265839Y (en) * | 2008-06-23 | 2009-07-01 | 周建辉 | LED lighting bulb |
| TWM346745U (en) * | 2008-07-25 | 2008-12-11 | Forcecon Technology Co Ltd | LED Lamp with heat-dissipation toward the terminal direction |
| CN101482255B (en) * | 2009-01-22 | 2011-03-16 | 广州南科集成电子有限公司 | High-power LED lamp circuit with fan |
| TW201024611A (en) * | 2008-12-26 | 2010-07-01 | Everlight Electronics Co Ltd | Heat dissipation device and light emitting device comprising the same |
| CN101608745A (en) * | 2009-07-29 | 2009-12-23 | 蒋仲林 | LED high brightness bulb |
-
2010
- 2010-08-24 IE IE20100521A patent/IES20100521A2/en not_active IP Right Cessation
-
2011
- 2011-08-18 GB GB1114210.6A patent/GB2483146B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| GB2483146A (en) | 2012-02-29 |
| GB201114210D0 (en) | 2011-10-05 |
| GB2483146B (en) | 2012-11-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MM4A | Patent lapsed |