CN102705718A - Single-element control constant current light-emitting diode (LED) module - Google Patents
Single-element control constant current light-emitting diode (LED) module Download PDFInfo
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- CN102705718A CN102705718A CN2011100974414A CN201110097441A CN102705718A CN 102705718 A CN102705718 A CN 102705718A CN 2011100974414 A CN2011100974414 A CN 2011100974414A CN 201110097441 A CN201110097441 A CN 201110097441A CN 102705718 A CN102705718 A CN 102705718A
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Abstract
The invention relates to a single-element control constant current light-emitting diode (LED) module. A single constant current control element is connected in series with LED lamp beads on the LED module to form a resistive load with extremely low temperature coefficient; the single constant current control element is a thermistor; according to a preferable scheme, a plurality of constant current control branches are formed on the LED module; and each constant current control branch is a combination of connecting the single constant current control element and a plurality of LED lamp beads in series. Compared with the prior art, the single-element control constant current LED module has the advantages that the requirement of the LED on a constant current source is met by using a single element only, and the LED module has the advantages in aspects of price, size, service life, optical characteristics and the like; and moreover, in the preferable scheme, multi-branch self-controlled constant current and synchronous constant current are realized, and the whole constant current control effect of the module is guaranteed.
Description
Technical field
The present invention relates to the LED technical field, be specifically related to the led module of single element control constant current.
Background technology
Existing LED product adopts the type of drive of constant-current source more, because of the LED tube core rises with environment temperature, can cause the increase of LED electric current, and the increase of electric current causes that again tube core heats up, and forms vicious circle, has shortened the LED life-span greatly, the light decay phenomenon of common name LED.Be specifically behind the PN junction forward conduction of LED; Junction voltage VF rises with environment temperature and descends promptly :-2mv/ ℃; Claim the negative temperature effect of PN junction, utilize this characteristic to can be made into temperature sensor, but this characteristic is fatal defective on lighting application; Directly influence its luminescent lifetime, luminosity, luminescent chromaticity.During such as 25 ℃ of, normal temperature, select LED recommended current 20mA; When environment temperature is raised to 85 ℃, junction voltage VF descends, and operating current sharply is increased to 35～37mA; The increase of electric current at this moment can not produce the increase of brightness; Claim luminance saturation, the rising of temperature also causes the skew of spectral wavelength, causes aberration.This high-temperature region of working when long also will cause device aging, and luminosity progressively reduces, the common name light decay.Equally, when environment temperature dropped to-40 ℃, junction voltage VF rose, and recommended current will reduce 8～10mA. from 20mA, and luminosity also reduces with the minimizing of electric current, reached the not required illumination of place illumination.
Deficiency for fear of above-mentioned characteristic is brought, on the Related product of LED, adopt following measure usually: 1, LED is contained on the heat sink, or the blower fan wind cooling temperature lowering; 2, LED adopts the power supply mode of constant-current source, does not cause that because of LED rises with temperature electric current increases, and prevents the pernicious intensification of PN junction.More than two kinds of methods are effective measures; Yet basing oneself upon the technology that solves heat dissipation problem exists on the one hand can not complete Theory to resolve and need carry out kinds of experiments in the hope of obtaining better effects; Simultaneously, arrange in the intensive space that is difficult in a normal lamp holder of heat sink and air-cooled ability; And the constant-current source circuit of forming with IC integrated circuit and many components and parts; It is the type of drive commonly used of present LED; Do not increase with solving the LED electric current, but its life-span and reliability do not depend on LED, and depend on certain piece " short slab " of whole constant-current system with the rising of temperature; The cost of IC constant-current system has also restricted LED and has walked popular route, the price that the LED product is not attracted eyeball simultaneously; In addition, the environment for use temperature from the junction temperature of PN junction to lighting, the path length of temperature conduction, compound many, the conventional heat conduction technique effects of medium are undesirable; The application of special technique then causes cost too high, and has the constant-current circuit system of system concept, except that wherein the single components and parts life-span can influence lifetime of system; And make outside long characteristic of LED illumination life-span has a greatly reduced quality; Be built in the light fixture or module on system, also exist the LED that occupies space considerable influence module to arrange and problem such as lamp body size, directly influenced the optimal design of led module; Restricted like fluorescent lamp, little shot-light, the exploitation of small size light fixtures such as lamps for vehicle.
Summary of the invention
The object of the invention is exactly many in order to overcome the constant-current source circuit element of being made up of IC integrated circuit and many components and parts in the existing led module; It is big to occupy the space; Defective such as life-span and less reliable and a kind of led module of single element control constant current is provided, the single constant current control element size that this led module adopts is little, has made things convenient for the design of module wiring board; Realized the automatic control of multiple branch circuit current constant simultaneously; The current management circuit has been shortened in refinement, improves the electric harmony of multiple branch circuit, thereby has guaranteed the optical characteristics and the life-span of led module.
The object of the invention can be realized through following technical scheme: the led module of single element control constant current, the LED lamp pearl on said single constant current control element and the said led module is composed in series the minimum resistor-type load of temperature coefficient.
Said led module is provided with many constant current control branch roads, and said every constant current control branch road all adopts the tandem compound of a said single constant current control element and a plurality of LED lamp pearls.
Said single constant current control element is a thermistor.
Said led module is of a size of 11.7*275, can be used as the long LED fluorescent lamp of T5 specification 300mm.
Two row LED lamp pearls are set on the said led module, and every row arranges three groups, and every group contains 1 of said thermistor, 7 on said LED lamp pearl.
Said two row LED lamp pearl dislocation are arranged, and realize the even distribution of light emitting source.
Compared with prior art, beneficial effect of the present invention is following:
1, owing to only just solved the demand of LED, compares, all have advantage at aspects such as price, volume, life-span and optical characteristics with the constant-current source of forming with elements such as integrated circuits to constant-current source with single constant current control element.
2, single constant current control element is small-sized, can be arranged between the module LED electroluminescent lamp pearl, is combined into a minimum resistor-type load of temperature coefficient with LED lamp pearl; In case after operating voltage was confirmed, the electric current in the series loop will can the significant change with variations in temperature.
3, single constant current control element can be combined into the least possible constant current branch road of lamp pearl number with LED lamp pearl; Realized the automatic control of multiple branch circuit current constant, the current management circuit has been shortened in refinement, improves the electric harmony of multiple branch circuit; Just realized the synchronous constant current of many branch roads on the module; Overcome traditional single constant-current supply and driven multiple branch circuit, possibly have the defective of each branch current inconsistency, thereby guaranteed the whole constant current control effect of module.
4, the position indefinite of constant current control element in the branch road series circuit made things convenient for the design of module wiring board.
Description of drawings
Fig. 1 is the structural representation of the led module of single element control constant current;
Fig. 2 is led module that adopts single control constant flow element and the current curve map that does not adopt the led module of single control constant flow element;
Among Fig. 1: 1 is single control constant flow element, and 2 is LED lamp pearl.
The specific embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is elaborated.
Embodiment:
As shown in Figure 1, the led module of single element control constant current adopts the single constant current control element 1 (+2mV/ ℃) with positive temperature coefficient to connect with the LED lamp pearl 2 (2mV/ ℃) of negative temperature characteristic, minimum resistor-type load of temperature coefficient of complementary one-tenth.After operating voltage was confirmed, the electric current in the series loop can the significant change with variations in temperature; That is to say that when LED increased with temperature rising electric current, single constant current control element 1 also became big with temperature rising resistance; Stoped the loop current rising; When LED reduced with the temperature drop-out current, single constant current control element 1 also with temperature decline resistance, had stoped the minimizing of loop current; Single constant current control element 1 is carried out suitable coupling with LED lamp pearl 2; When environment temperature changes in-40 ℃ of-85 ℃ of scopes; The recommended current of LED can significant change; Its current curve is as shown in Figure 2: current curve I is not for adopting the LED current curve of said single constant current control element 1 among Fig. 2; Current curve II is the LED current curve that has adopted said single constant current control element 1, can be found out by current curve contrast among the figure: when environment temperature changes in-40 ℃ of-85 ℃ of scopes, adopted the recommended current of the led module of said single constant current control element 1 can significant change.
In the present embodiment, said led module is provided with many constant current control branch roads, and said every constant current control branch road all adopts the tandem compound of a said single constant current control element 1 and a plurality of LED lamp pearls 2.Because single constant current control element 1 is small-sized; Can be arranged between the module LED electroluminescent lamp pearl 2, be combined into the least possible constant current branch road of lamp pearl number, realize the automatic control of multiple branch circuit current constant with LED lamp pearl 2; The current management circuit has been shortened in refinement; Improve the electric harmony of multiple branch circuit, just realized the synchronous constant current of many branch roads on the module, overcome traditional single constant-current supply and drive multiple branch circuit; Possibly there is the defective of each branch current inconsistency, thereby guaranteed the whole constant current control effect of module.Because constant current control element 1 is small-sized, its position indefinite in the branch road series circuit has further facilitated the design of module wiring board simultaneously.
In the present embodiment, said single constant current control element 1 is a thermistor.The constant-current source that adopts elements such as temperature compensation by thermistor method and integrated circuit to form is compared, the part that plays the same tune on different musical instruments, but the former only needs use a kind of element, has just solved the constant current demand of LED, has advantage at aspects such as price, volume, life-spans.
In the present embodiment, said led module is of a size of 11.7*275, can be used as the long LED fluorescent lamp of T5 specification 300mm.Two row LED lamp pearls 2 are set on said led module, and every row arranges three groups, and every group contains 1 of said thermistor, 7 on said LED lamp pearl.
In the present embodiment, 2 dislocation of said two row LED lamp pearls are arranged, and realize the even distribution of light emitting source.The installing hole of 3 3mm is arranged on the cell board of fixing this module, and the connection pad at these cell board two ends is used for string and the connection between the module.
Claims (6)
1. the led module of single element control constant current, it is characterized in that: the LED lamp pearl (2) on said single constant current control element (1) and the said led module is composed in series the minimum resistor-type load of temperature coefficient.
2. the led module of single element control constant current according to claim 1; It is characterized in that: said led module is provided with many constant current control branch roads, and said every constant current control branch road all adopts the tandem compound of a said single constant current control element (1) and a plurality of LED lamp pearls (2).
3. the led module of single element control constant current according to claim 1 and 2, it is characterized in that: said single constant current control element (1) is a thermistor.
4. the led module of single element control constant current according to claim 3, it is characterized in that: said led module is of a size of 11.7*275, can be used as the long LED fluorescent lamp of T5 specification 300mm.
5. the led module of single element control constant current according to claim 4 is characterized in that: two row LED lamp pearls (2) are set on the said led module, and every row arranges three groups, and every group contains 1 of said thermistor, (2) 7 on said LED lamp pearl.
6. the led module of single element control constant current according to claim 5 is characterized in that: said two row LED lamp pearl (2) dislocation are arranged.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011100974414A CN102705718A (en) | 2011-04-19 | 2011-04-19 | Single-element control constant current light-emitting diode (LED) module |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011100974414A CN102705718A (en) | 2011-04-19 | 2011-04-19 | Single-element control constant current light-emitting diode (LED) module |
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| CN102705718A true CN102705718A (en) | 2012-10-03 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106131995A (en) * | 2016-06-24 | 2016-11-16 | 山东明兴集成电路设计开发有限公司 | A kind of self feed back connection in series-parallel high-voltage LED load and current control method |
| CN106369292A (en) * | 2016-07-01 | 2017-02-01 | 深圳市长运通光电技术有限公司 | LED light source module based on chip scale package and LED lamp |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201322224Y (en) * | 2008-12-25 | 2009-10-07 | 王鸿麟 | Anti-strong shock LED lighting lamp used on aeroengine test bench |
| CN101634401A (en) * | 2008-07-21 | 2010-01-27 | 袁雁鸿 | Design scheme for multi-variety and series LED illuminating lamps, and control circuits and universal modularized printed circuit boards thereof |
| CN202100973U (en) * | 2011-04-19 | 2012-01-04 | 雷德技术(芜湖)有限公司 | LED module with single constant-current control element |
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- 2011-04-19 CN CN2011100974414A patent/CN102705718A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101634401A (en) * | 2008-07-21 | 2010-01-27 | 袁雁鸿 | Design scheme for multi-variety and series LED illuminating lamps, and control circuits and universal modularized printed circuit boards thereof |
| CN201322224Y (en) * | 2008-12-25 | 2009-10-07 | 王鸿麟 | Anti-strong shock LED lighting lamp used on aeroengine test bench |
| CN202100973U (en) * | 2011-04-19 | 2012-01-04 | 雷德技术(芜湖)有限公司 | LED module with single constant-current control element |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106131995A (en) * | 2016-06-24 | 2016-11-16 | 山东明兴集成电路设计开发有限公司 | A kind of self feed back connection in series-parallel high-voltage LED load and current control method |
| CN106369292A (en) * | 2016-07-01 | 2017-02-01 | 深圳市长运通光电技术有限公司 | LED light source module based on chip scale package and LED lamp |
| CN106369292B (en) * | 2016-07-01 | 2019-10-18 | 深圳市长运通半导体技术有限公司 | LED light source mould group and LED lamp based on wafer-level package |
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Application publication date: 20121003 |