CN107795863B - LED lamp with low heat generation and method for reducing heat generation of LED lamp - Google Patents
LED lamp with low heat generation and method for reducing heat generation of LED lamp Download PDFInfo
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- CN107795863B CN107795863B CN201711239572.5A CN201711239572A CN107795863B CN 107795863 B CN107795863 B CN 107795863B CN 201711239572 A CN201711239572 A CN 201711239572A CN 107795863 B CN107795863 B CN 107795863B
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 230000020169 heat generation Effects 0.000 title claims description 9
- 239000011324 bead Substances 0.000 claims abstract description 75
- 230000017525 heat dissipation Effects 0.000 abstract description 19
- 238000013461 design Methods 0.000 abstract description 17
- 238000010438 heat treatment Methods 0.000 abstract description 7
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000006243 chemical reaction Methods 0.000 description 22
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000001795 light effect Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000012536 packaging technology Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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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
- F21K9/20—Light sources comprising attachment means
-
- 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
-
- 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
-
- 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
- F21V29/10—Arrangement of heat-generating components to reduce thermal damage, e.g. by distancing heat-generating components from other components to be protected
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
-
- 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]
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention discloses a low-heating LED lamp, which comprises: the LED lamp comprises a power supply with unchanged output power and a lamp panel coupled with the power supply, wherein a plurality of strings of first lamp beads are connected in parallel on the lamp panel, and a plurality of shunt devices are also connected in parallel on the lamp panel. The beneficial effects are that: the invention adopts the method of increasing the quantity of LED lamp beads and reducing the driving current of the LED lamp beads on the basis of the traditional lamp design, so that the final output illuminance of the product is kept unchanged or even higher, but the thermal power of the product is greatly reduced, thereby reducing the heating value of the whole lamp to be less than half of the original value, greatly simplifying or omitting the heat dissipation design of the lamp, reducing the design difficulty of the high-power white light lamp and prolonging the service life of the product.
Description
Technical Field
The invention relates to the field of LED lamps, in particular to a low-heating LED lamp and a method for reducing heating of the LED lamp.
Background
Along with the development of LED technology, especially the reduction of the cost and the increase of the light efficiency of white light LEDs, the application of LED lamps in various industries is also enabled to be responsive; although the LED lamp has the advantages of high light efficiency and low heat productivity compared with the traditional incandescent lamp and tungsten filament lamp, as the application power of the white light lamp by people is larger and the requirement is higher, the heat productivity of the high-power white light lamp is a key consideration problem in the industry, but all the applications of the white light LEDs at present tend to adopt various active heat dissipation modes to reduce the temperature of the LED lamp, such as adding heat dissipation fins, installing heat dissipation fans and the like, so that the power of the lamp can be higher and the service life is longer; however, the heat dissipation design is a relatively popular and professional field, and many companies are not equipped with professional heat dissipation design talents, so that even if professional heat dissipation design talents exist, the designed heat dissipation scheme is proved to be feasible by experiments mostly, and for some occasions or lamp products, the traditional heat dissipation method by adding heat dissipation fins or heat dissipation fans is limited due to the limitation of volume or weight, and particularly under the small-volume and mute environment, the traditional heat dissipation method becomes difficult to spread; for the above reasons, many uncontrollable factors and risks are added to the design of the white light LED lamp, which afflicts many lamp designs and manufacturers.
On the other hand, since LEDs operate in a relatively high temperature environment for a long period of time, although the theoretical lifetime of LEDs can reach 5 to 10 tens of thousands of hours, the actual operating lifetime is far below this time.
Disclosure of Invention
The invention aims at overcoming the defects in the prior art and provides a low-heating LED lamp and a method for reducing the heating of the LED lamp.
The invention adopts the technical scheme that the LED lamp with low heat emission is designed, and comprises: the LED lamp comprises a power supply with unchanged output power and a lamp panel coupled with the power supply, wherein a plurality of strings of first lamp beads are connected in parallel on the lamp panel, and the LED lamp is characterized in that a plurality of shunt devices are also connected in parallel on the lamp panel. The current on the circuit is reduced by the shunt device, so that the current passing through the lamp beads is reduced, and the conversion efficiency of the lamp beads is greatly improved.
Preferably, the number of the shunt devices is set according to the value of the output power, so that the current value passing through each string of first lamp beads is 15% -30% of the normal working current.
Preferably, the number of the shunt devices is set according to the value of the output power, so that the current value passing through each string of first lamp beads is 20% -25% of the normal working current.
Preferably, the shunt device is a second lamp bead. In order to obtain a higher light output.
Preferably, the first lamp bead and the second lamp bead are LED lamp beads with the same power. The current LED lamp beads are most widely practical and convenient to install.
A method of reducing heat generation of an LED luminaire, comprising: and under the condition that the output power is unchanged, the lamp panel is also connected with a plurality of shunt devices in parallel. The current on the circuit is reduced by the shunt device, so that the current passing through the lamp beads is reduced, and the conversion efficiency of the lamp beads is greatly improved.
Preferably, a plurality of shunt devices are connected in parallel according to a fixed value of output power so that the current value passing through each string of first beads is 15% -30% of the normal operating current.
Preferably, the number of the shunt devices is set according to the value of the output power, so that the current value passing through each string of first lamp beads is 20% -25% of the normal working current.
Preferably, the shunt device is a second lamp bead. In order to obtain a higher light output.
Preferably, the first lamp bead and the second lamp bead are LED lamp beads with the same power. The current LED lamp beads are most widely practical and convenient to install.
Compared with the prior art, the invention has at least the following beneficial effects: the invention adopts the method of increasing the number of LED lamp beads and reducing the driving current of each LED lamp bead on the basis of the traditional lamp design, so that the final output illuminance of the product is kept unchanged or even higher, but the thermal power of the product is greatly reduced, thereby reducing the heating value of the whole lamp to be less than half of the original value, greatly simplifying or omitting the heat dissipation design of the lamp, reducing the design difficulty of a high-power white light lamp and prolonging the service life of the product.
Drawings
FIG. 1 is a diagram of a multi-bead low power output connection in accordance with an embodiment of the present invention;
FIG. 2 is a graph showing the comparison of current and light effect according to an embodiment of the present invention.
Detailed Description
The invention is further described below with reference to the drawings and examples.
As shown in fig. 1 to 2, the present invention provides a low-heat LED lamp, including: the LED lamp comprises a power supply with unchanged output power and a lamp panel coupled with the power supply, wherein a plurality of strings of first lamp beads are connected in parallel on the lamp panel, and the LED lamp is characterized in that a plurality of shunt devices are also connected in parallel on the lamp panel. The current on the circuit is reduced by the shunt device, so that the current passing through the lamp beads is reduced, and the conversion efficiency of the lamp beads is greatly improved. Under the condition of the same output power, the working current of each LED is lower, so that the light conversion efficiency of the LED lamp beads is improved, the heat conversion rate is reduced, and the purposes of improving the brightness of the lamp and reducing the temperature of the lamp are achieved.
In this embodiment, the number of the shunt devices is set according to the value of the output power, so that the current value passing through each string of first lamp beads is 15% -30% of the normal working current. The normal working current in this embodiment is based on a set value of each LED bead when leaving the factory, and is a rated working current of the LED bead, and this rated working current is generally set based on the package of the LED.
Further preferably, the number of the shunt devices is set according to the value of the output power so that the current value passing through each string of first lamp beads is 20% -25% of the normal working current. In this range, a good low heat generation amount and a good luminous efficiency are obtained.
In this embodiment, the shunt device is the second lamp pearl, and the shunt device also adopts the lamp pearl, can obtain higher luminance that goes out like this, has also avoided the waste of energy simultaneously.
In this embodiment, the first lamp bead and the second lamp bead are LED lamp beads with the same power. The current LED lamp beads are most widely practical and convenient to install.
Based on the above embodiment, the present invention further provides a method for reducing heat generation of an LED lamp, including: and under the condition that the output power is unchanged, the lamp panel is also connected with a plurality of shunt devices in parallel. The current on the circuit is reduced by the shunt device, so that the current passing through the lamp beads is reduced, and the conversion efficiency of the lamp beads is greatly improved. Under the condition of the same output power, the working current of each LED is lower, so that the light conversion efficiency of the LED lamp beads is improved, the heat conversion rate is reduced, and the purposes of improving the brightness of the lamp and reducing the temperature of the lamp are achieved.
In this embodiment, a plurality of current dividing devices are connected in parallel according to a fixed output power value so that the current value passing through each string of first lamp beads is 15% -30% of the normal working current. The normal working current in this embodiment is based on a set value of each LED bead when leaving the factory, and is a rated working current of the LED bead, and this rated working current is generally set based on the package of the LED.
In this embodiment, the number of the shunt devices is set according to the value of the output power, so that the current value passing through each string of first lamp beads is 15% -30% of the normal working current.
In this embodiment, the shunt device is a second lamp bead. In order to obtain a higher light output.
In this embodiment, the first lamp bead and the second lamp bead are LED lamp beads with the same power. The current LED lamp beads are most widely practical and convenient to install. As shown in fig. 1, in order to increase the number of LED beads, the power of each bead is still 0.5W, and the total input power of the whole LED circuit is kept unchanged, i.e. the input voltage is ensured to be DC 12V, and the total input current is 850ma; however, since the number of LED beads is increased in this scheme, the current actually flowing through each LED is only about 42ma, that is, the LED is only operated at about 1/4 of the standard operating current, as shown in fig. 2, the light efficiency value of the LED is relatively high, the power-to-light efficiency conversion rate is about 1.8 times of the standard operating current, and similarly, the thermal conversion rate is reduced to about 28%, so that the LED lamp with the same 10W in this scheme has only the thermal power as compared with the first scheme: 10W x 28% = 2.8W, whereas the optical power is 7.2W accordingly; under the same input power condition, the LED works in a low current area by increasing the number of LED lamp beads, the light output power of the whole lamp is improved to about 1.8 times, the heat power is reduced by 1 time, and the heat dissipation design of the lamp is greatly simplified or can be directly omitted.
As shown in FIG. 2, a curve of comparing current and light efficiency of a high-power white light LED lamp bead is that when the current is within 100MA, the light efficiency of the LED lamp bead is more than 120LM/W, and when the current of the LED is more than 500MA, the light efficiency is only 70LM/W or even lower, and calculated according to the current general light conversion efficiency, the light conversion efficiency is about 1.8 times of the light conversion efficiency when the light conversion efficiency is about 500MA and is within 100MA, namely, if the light conversion efficiency is 40% when the light conversion efficiency is within 500MA, the light conversion efficiency is 72% when the light conversion efficiency is within 100 MA; similarly, 60% of energy is converted into heat when the current is more than 500m, and only 28% of energy is converted into heat when the current is less than 100ma, and the conversion rate of heat is more than 2 times under the two current working conditions according to the theoretical value; it is generally known that in practical applications, the design is carried out substantially in accordance with its actual standard operating current, i.e. in a typical design about 60% of the energy is converted into heat rather than light.
Based on the principle, when in practical application, the power number designed according to the requirement is designed, the original plan adopts 10W lamp beads as a light source, 850Ma current (calculated according to the actual power of the LED lamp beads) is adopted to supply power, the light efficiency is only 10 W.40%, if 420Ma current is adopted to supply power, the lamp beads with the power of about 55W are only required to serve as the light source to generate the same or even higher light emitting effect, and the lamp beads with the power of 55W are adopted as the light source, and the low current is adopted to supply power, so that the heat conversion rate is only 28%, and the generated heat is only: 10W x 28% = 2.8W, far lower than the heat generated by the first regime: the heat power is reduced, the temperature generated by the lamp is reduced naturally, the heat dissipation treatment can be calculated from the original complex heat, the heat dissipation engineering scheme is changed into simple natural heat dissipation, and even on the ultra-high power lamp, the heat productivity is only half of the original design under the condition of the same light output by adopting the method, and the heat dissipation design can be greatly simplified;
the power supply current of the LED lamp beads is only 100ma, which is far lower than the standard working current, and the heat productivity of the LEDs is greatly reduced, so that the service life of the LED lamp beads of the core device of the lamp is greatly prolonged, and the quality of products is improved;
meanwhile, according to calculation, under the condition of the same 10W power supply, the conversion efficiency of the LED is improved to 72%, so that the light emitting power of the LED lamp is improved to: 10w×72% =7.2w, which is much higher than 10w×40% =4w before improvement, that is, under the same output power condition, higher illuminance can be obtained due to low thermal conversion rate of the LED beads;
although this solution will increase the cost of the LED lamp beads, under the market conditions of mature LED lamp bead packaging technology, the price per watt of lamp beads is already very low, and the added cost is far lower than the cost on heat dissipation design and the guarantee of product life.
The above examples are only for illustrating specific embodiments of the present invention. It should be noted that it will be apparent to those skilled in the art that modifications and variations can be made without departing from the spirit of the invention, and these modifications and variations should be considered to be within the scope of the invention.
Claims (8)
1. A low heat emitting LED light fixture comprising: the LED lamp comprises a power supply with unchanged output power and a lamp panel coupled with the power supply, wherein a plurality of strings of first lamp beads are connected in parallel on the lamp panel, and the LED lamp is characterized in that a plurality of shunt devices are also connected in parallel on the lamp panel; and setting the number of the shunt devices according to the value of the output power so that the current value passing through each string of first lamp beads is 15-30% of the normal working current.
2. The low heat generating LED lamp of claim 1, wherein the number of shunt devices is set according to the value of the output power such that the current value through each string of first beads is 20% -25% of the normal operating current.
3. The low heat generating LED light fixture of claim 1 wherein the shunt device is a second bead.
4. The low heat generating LED light fixture of claim 3 wherein the first and second light beads are LED light beads of the same power.
5. A method of reducing heat generation in an LED lamp, comprising: under the condition that the output power of the power supply is unchanged, a plurality of shunt devices are connected in parallel with a lamp panel coupled with the power supply; and connecting a plurality of shunt devices in parallel according to the fixed output power value so that the current value passing through each string of first lamp beads is 15-30% of the normal working current.
6. The method of reducing heat generation of an LED lamp of claim 5, wherein the number of shunt devices is set according to the value of the output power such that the current value through each string of first beads is 20% -25% of the normal operating current.
7. The method of claim 5, wherein the shunt device is a second bead.
8. The method of claim 7, wherein the first and second beads are LEDs with the same power.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711239572.5A CN107795863B (en) | 2017-11-30 | 2017-11-30 | LED lamp with low heat generation and method for reducing heat generation of LED lamp |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711239572.5A CN107795863B (en) | 2017-11-30 | 2017-11-30 | LED lamp with low heat generation and method for reducing heat generation of LED lamp |
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| Publication Number | Publication Date |
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| CN107795863A CN107795863A (en) | 2018-03-13 |
| CN107795863B true CN107795863B (en) | 2024-01-30 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101018436A (en) * | 2007-02-12 | 2007-08-15 | 深圳市泉芯电子技术有限公司 | Power constant LED driver |
| CN204240206U (en) * | 2014-12-10 | 2015-04-01 | 昆山桑莱特新能源科技有限公司 | A kind of Novel LED street lamp module |
| CN105072745A (en) * | 2015-07-29 | 2015-11-18 | 南京富赣照明科技有限公司 | Method for extending LED light source service life and device |
| CN205213081U (en) * | 2015-12-15 | 2016-05-04 | 深圳市思坎普科技有限公司 | Power driving circuit of LED lamps and lanterns |
| CN205648129U (en) * | 2016-05-27 | 2016-10-12 | 合肥工业大学 | LED electricity light source device based on best light efficiency and life |
| CN207935770U (en) * | 2017-11-30 | 2018-10-02 | 深圳市爱图仕影像器材有限公司 | A kind of LED lamp of low fever |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140210372A1 (en) * | 2013-01-27 | 2014-07-31 | Well Thai Group Ltd | Constant-current circuit apparatus of parallel led luminaires |
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2017
- 2017-11-30 CN CN201711239572.5A patent/CN107795863B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101018436A (en) * | 2007-02-12 | 2007-08-15 | 深圳市泉芯电子技术有限公司 | Power constant LED driver |
| CN204240206U (en) * | 2014-12-10 | 2015-04-01 | 昆山桑莱特新能源科技有限公司 | A kind of Novel LED street lamp module |
| CN105072745A (en) * | 2015-07-29 | 2015-11-18 | 南京富赣照明科技有限公司 | Method for extending LED light source service life and device |
| CN205213081U (en) * | 2015-12-15 | 2016-05-04 | 深圳市思坎普科技有限公司 | Power driving circuit of LED lamps and lanterns |
| CN205648129U (en) * | 2016-05-27 | 2016-10-12 | 合肥工业大学 | LED electricity light source device based on best light efficiency and life |
| CN207935770U (en) * | 2017-11-30 | 2018-10-02 | 深圳市爱图仕影像器材有限公司 | A kind of LED lamp of low fever |
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| CN107795863A (en) | 2018-03-13 |
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