CN104714163A - Brand-new single-line transmission three-channel constant-current driving chip LED epitaxial wafer - Google Patents
Brand-new single-line transmission three-channel constant-current driving chip LED epitaxial wafer Download PDFInfo
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Abstract
The invention discloses a brand-new single-line transmission three-channel constant-current driving chip LED epitaxial wafer. The epitaxial wafer is not influenced by voltage of a load at an output end; 2, output current has a range of 0 to 30mA; 3, typical current is 20mA, and external resistance is 620 omega; 4, a Manchester communication interface is provided; 5, dual-channel data transmission can be supported, and reliability of the system is improved; 6, a cascade driving ability is super strong, and the maximal cascade number for a single line arrives at 1024; 7, 4096-level PWM grayscale control is realized; 8, staggered time of output channels is delayed by 80ns, and transient current of the system and noise generated thereby are reduced to the minimal; 9, output current are precise, +/-1.5% between the channels and +/-3% between chips are realized; 10, a wide data transmission rate range: 100KHz to 1.5MHz is realized, and a wide working voltage range: 5 to 17V is realized; 11, the power consumption amount is as low as less than 100mW; 12, the refresh rate is high, and the PWM output frequency can reach more than 1000Hz; and 13, the anti-interference ability is super strong, and ESD is larger than 7KV.
Description
The present invention's brand-new single wire transmission triple channel constant-current driven chip LED belongs to electronic applications.
Light emitting diode is referred to as LED.The diode be made up with the compound of arsenic (AS), phosphorus (P) of gallium (Ga), can give off visible ray when electronics and hole-recombination, thus can be used for making light emitting diode.As pilot lamp in circuit and instrument, or form word or numerical monitor.Gallium arsenide phosphide diode glows, gallium phosphide diode green light, silicon carbide diode Yellow light-emitting low temperature.
Light emitting diode (English: Light-Emitting Diode is called for short LED) is a kind of semiconductor electronic component that can be luminous.This electronic component occurred as far back as 1962, and can only send the ruddiness of low luminosity in early days, develop other monochromatic versions afterwards, the light that can send even to this day is throughout visible ray, infrared ray and ultraviolet, and luminosity also brings up to suitable luminosity.And purposes is also by the beginning as pilot lamp, display board etc.; Along with the continuous progress of technology, light emitting diode has been widely used in display, televisor daylighting decoration and illumination.
LED can only toward a direction conducting (energising), be called forward bias (forward bias), when the current flows, electronics and hole compound and send monochromatic light within it, this is electroluminescent effect, and the wavelength of light, color are relevant with the element impurity of mixing with its semiconductor material kind adopted.Have that efficiency is high, the life-span be long, advantage that conventional light source such as high, the high reliability of cracky, switching speed is not too late.The luminescence efficiency of white light LEDs, has had obvious lifting in recent years, meanwhile, in the buying price of every kilolumen, also because of the impact that the manufacturer put goods on the market vies each other, and obviously declines.Although more and more people uses LED illumination to make office, furniture, decoration, signboard even street lamp purposes, but technically, LED still lower than novel fluorescent light, is the whereabouts that after country, development is civilian in photoelectric transformation efficiency (Effective Illuminance is to the ratio of power consumption)!
Light emitting diode
It is the one of semiconductor diode, electric energy conversion can be become luminous energy; Often be abbreviated as LED.Light emitting diode is the same with general-purpose diode to be made up of a PN junction, also has unilateral conduction.After adding forward voltage to light emitting diode, be injected into the hole in N district from P district and be injected into the electronics in P district by N district, near PN junction in several microns respectively with the electronics in N district and the hole-recombination in P district, produce the fluorescence of spontaneous radiation.In different semiconductor materials, electronics is different with the energy state residing for hole.The amount discharged when electronics and hole-recombination is different, and the energy discharged is more, then the wavelength of the light sent is shorter.Conventional is glows, the diode of green glow or gold-tinted.
The breakdown reverse voltage of light emitting diode about 5 volts.Its forward volt-ampere characteristic is very steep, and during use, necessary series limiting resistor is to control the electric current by pipe.Current-limiting resistance R can calculate with following formula:
R=（E－UF）/IF
In formula, E is supply voltage, and UF is the forward voltage drop of LED, and IF is the general work electric current of LED.
R=（E－UF）/IF
In formula, E is supply voltage, and UF is the forward voltage drop of LED, and IF is the general work galvanoluminescence diode of LED
One longer in two lead-in wires of physical characteristics light emitting diode is positive pole, should connect positive source.Two of some light emitting diodes go between equally long, but shell have the uvula of a projection, and the lead-in wire near uvula is positive pole.Light emitting diode
Steep with small filament lamp and compare with neon lamp, the feature of light emitting diode is: operating voltage very low (more several volts had); Working current very little (the only zero point several milliamperes had can be luminous); Shock resistance and anti-seismic performance good, reliability is high, and the life-span is long; Can the power of modulated luminescence easily by modulating that the electric current that passes through is strong and weak.Owing to there being these features, light emitting diode is used as light source in some photoelectric control equipments, in many electronic equipments, be used as Signal Monitor.Its die is done into strips, forms 7 segmentation semiconductors with the luminotron of 7 strips, each charactron can show 0 ~ 90 figure.
Principle of luminosity before 50 years people understood the ABC that semiconductor material can produce light, first commercial diode results from nineteen sixty.LED is English light emitting diode(light emitting diode) abbreviation,
Light emitting diode
Its basic structure is one block of electroluminescent semiconductor material, is placed on a leaded shelf, then surrounding epoxy sealing, plays the effect of protection internal core, so the anti-seismic performance of LED is good.
The wafer that the core of light emitting diode is made up of P-type semiconductor and N-type semiconductor, has a transition bed, is called PN junction between P-type semiconductor and N-type semiconductor.In the PN junction of some semiconductor material, the minority carrier of injection and majority carrier compound tense can discharge unnecessary energy in the form of light, thus electric energy is directly converted to luminous energy.PN junction adds reverse voltage, and minority carrier is difficult to inject, therefore not luminous.This diode utilizing injection electroluminescence principle to make, light emitting diode, is generally called LED.When it is in forward duty (two ends add forward voltage), when electric current flows to negative electrode from LED anode, semiconductor crystal just sends the light from ultraviolet to infrared different colours, the power of light and current related.
Be below the inorganic semiconductor material that uses of conventional light emitting diodes and the color of their luminescences
Aluminum gallium arsenide (AlGaAs)-redness and infrared ray
Aluminum gallium phosphide (AlGaP)-green
The Chinese red of AlGaInP (AlGaInP)-high brightness, orange, yellow, green
Gallium arsenide phosphide (GaAsP)-redness, Chinese red, yellow
Gallium phosphide (GaP)-redness, yellow, green
Gallium nitride (GaN)-green, emerald green, blue
Indium gallium nitride (InGaN)-near ultraviolet ray, blue-green, blue
Silit (SiC) (as substrate)-blue
Silicon (Si) (as substrate)-blue (in exploitation)
Sapphire (Al2O3) (as substrate)-blue
Zincselenide (ZnSe)-blueness
Diamond (C)-ultraviolet
Aluminium nitride (AlN), aluminiumgalliumnitride (AlGaN)-wavelength is as far as near ultraviolet
Classification light emitting diode also can be divided into normal monochrome light emitting diode, high brightness LED, super brightness emitting LED
Diode, color-changing light-emitting diode, blinking light emitting diode, voltage-controlled type light emitting diode, infrarede emitting diode and negative resistance light emitting diode etc.
Normal monochrome light emitting diode
Normal monochrome light emitting diode has the advantages such as volume is little, operating voltage is low, working current is little, luminescence is uniform and stable, fast response time, life-span length, and the power drives such as available various direct current, interchange, pulse are lighted.It belongs to electric current controlling semiconductor device, need be connected in series suitable current-limiting resistance during use.
The glow color of normal monochrome light emitting diode is relevant with luminous wavelength, and the wavelength of luminescence depends on light emitting diode processed
Make the semiconductor material that light emitting diode is used.The wavelength of red light emitting diodes is generally 650 ~ 700nm, the wavelength of amber light emitting diode is generally 630 ~ 650 nm, the wavelength of orange luminescence diode is generally about 610 ~ 630 nm, the wavelength of yellow light-emitting diode is generally about 585 nm, and the wavelength of green LED is generally 555 ~ 570 nm.The domestic normal monochrome light emitting diode commonly used has BT(emblem mark model) serial, FG(portion mark model) serial and 2EF series, in Table 4-26, show 4-27 and show 4-28.
Conventional import normal monochrome light emitting diode has SLR series and SLC series etc.
High brightness single color LED
The semiconductor material that high brightness single color LED uses with super brightness single color LED is different from normal monochrome light emitting diode, so the intensity of luminescence is also different.
Usually, high brightness single color LED uses the materials such as arsenic calorize gallium (GaAlAs), super brightness single color LED uses the materials such as phosphorus indium gallium arsenide (GaAsInP), and normal monochrome light emitting diode uses the materials such as gallium phosphide (GaP) or gallium arsenide phosphide (GaAsP).
The major parameter of conventional High brightness Red LED is in Table 4-29, and the major parameter of conventional super brightness single color LED is in Table 4-30.
Color-changing light-emitting diode
Color-changing light-emitting diode is the light emitting diode that can convert glow color.Color-changing light-emitting LED lighting color category can be divided into dichromatic LED, Tricolor LED and polychrome (having red, blue, green, Bai Si kind color) light emitting diode.
Color-changing light-emitting diode can be divided into two end color-changing light-emitting diodes, three end color-changing light-emitting diodes, four end color-changing light-emitting diodes and six end color-changing light-emitting diodes by pin number.
Conventional dichromatic LED has 2EF series and TB series, and conventional Tricolor LED has the models such as 2EF302,2EF312,2EF322.
Blinking light emitting diode
Blinking light emitting diode (BTS) is a kind of special luminescent device be made up of CMOS integrated circuit and light emitting diode, can be used for report to the police instruction and under-voltage, superpressure instruction.
Blinking light emitting diode in use, need not other element external, as long as add that at its pin two ends suitable direct-current working volts (5V) get final product flashing.
Voltage-controlled type light emitting diode
Common light emitting diode belongs to current control device, needs the current-limiting resistance being connected in series suitable resistance in use.Voltage-controlled type light emitting diode (BTV) be by light emitting diode and current-limiting resistance integrated be made as one, directly can be attempted by both ends of power during use.
Infrarede emitting diode
Infrarede emitting diode also claims infrared light emitting diode, and it electric energy can be directly changed into infrared light (invisible light) and the luminescent device that can radiate, and is mainly used in various light-operated and remote controlled transmitting circuit.
Structure, the principle of infrarede emitting diode are close with common light emitting diode, and the semiconductor material just used is different.Infrarede emitting diode uses the material such as gallium arsenide (GaAs), arsenic calorize gallium (GaAlAs) usually, adopts all-transparent or resin-encapsulated that is light blue, black.
Conventional infrarede emitting diode has SIR series, SIM is serial, PLT is serial, GL is serial, HIR is serial and HG is serial etc.
The blue-ray LED that LED is formed with GaN 1993, the Shuji Nakamura (ShujiNakamura) worked at Japanese NichiaCorporation (day sub-chemical industry) has at that time invented the blue-ray LED with commercial application value of sowing (InGaN) based on semiconductor material with wide forbidden band gallium nitride (GaN) and indium nitrogenize, and this kind of LED was used widely in the later stage in the 1990's.Blue-ray LED can produce white light in conjunction with original red-light LED and green light LED in theory, but white light LEDs is created seldom like this.
The white light LEDs major part of current production is that this yellow phosphor normally passes through the YttriumAlum mixing cerium by making at the upper faint yellow fluorescent coating of one deck that covers of blue-ray LED (near-UV, wavelength 450nm to 470nm)
Light emitting diode
InumGarnet (Ce3+:YAG) crystal is mixed in a kind of dense binder after claying into power and makes.When LED chip sends blue light, some blue light just can be converted to the light being mainly yellow of a spectrum wider (spectral centroid is about 580nm) very efficiently by this crystal.(in fact the YAG mixing Ce of monocrystalline is regarded as scintillater more than phosphor.) ruddiness in naked eyes and green glow acceptor can be stimulated due to gold-tinted, then mix the blue light of LED itself, make it seem just as white light, and its color and luster is often referred to as " white of moonlight ".The method of this making white light LEDs is developed by NichiaCorporation and was used in from 1996 to produce on white light LEDs.To the color of the yellowish coloured light of adjustment, other rare earth metal Tb available or gadolinium replace the cerium (Ce) mixed in Ce3+:YAG, even can accomplish in the mode replacing part in YAG or whole aluminium.And based on the characteristic of its spectrum, red and green object seems under this LED illumination can not as good as so distinct during wealthy spectrum light source irradiation.
In addition due to the variation of working condition, the colour temperature of the finished product of this LED disunity, having to cold blueness from warm yellow, so can make differentiation with its characteristic out in process of production.
The method of another white light LEDs made is then a little as daylight lamp, the LED sending black light can be coated with the potpourri of two kinds of phosphors, be glow and the europium of blue light, another kind is green light, is doped with copper and the aluminium of zinc sulphide (ZnS).But because ultraviolet can make the epoxy resin cracking in binder go bad, so production difficulty is higher, and the life-span is also shorter.Compare with first method, its efficiency is lower and produce more heat (because StokesShift the former larger), but benefit to be the characteristic of spectrum better, the light of generation is good-looking.And due to the LED power of ultraviolet light higher, though so its efficiency to compare first method low, brightness is out similar.
A kind of up-to-date method manufacturing white light LEDs does not use phosphor again.New way is the epitaxial layer at zinc selenide (ZnSe) grown on substrates zinc selenide.During energising its enliven area can send blue light and substrate can Yellow light-emitting low temperature, mixing is white light.
Method for designing and the thinking of conventional light source have been broken in the appearance of design concept LED, have the design concept that two kinds up-to-date at present.
Sight throws light on
Carry out design lamps with the demand of environment.Sight illumination is starting point with place, and be intended to build a kind of beautiful, gorgeous photoenvironment, go to set off scene effect by contrast, people is felt scene atmosphere.
Emotional-appeal illumination
Carry out design lamps with Man's Demands.Emotional-appeal illumination is with people's emotion for starting point, goes to create the photoenvironment as a kind of artistic conception from the angle of people.Emotional-appeal illumination and sight throw light on different, and emotional-appeal illumination is dynamic, can meet the lighting system of the spiritual demand of people, make people feel there is sentiment; And sight illumination is static, it can only emphasize the demand of scene illumination, and can not express the mood of people, and in a sense, emotional-appeal illumination contains sight illumination.
Light source feature voltage
LED uses low-tension supply, and supply voltage is between 3-24V, different according to product difference, so it is the power supply that a ratio uses high-voltage power supply safer, is specially adapted to public place.Light emitting diode
Usefulness
Consumed energy comparatively reduces 80% with the incandescent lamp of light efficiency
Applicability
Volume is very little, and each unit LEDs small pieces are squares of 3-5mm, so can be prepared into the device of various shape, and is suitable for variable environment
Stability
100000 hours, light decay was initial 50%
Response time
The response time of its incandescent lamp is Millisecond, and the response time of LED is nanosecond
Environmental pollution
Without poisonous metal mercury
Color
Light emitting diode is conveniently by chemical modification method, and the band structure of adjustment material and energy gap, realize red, yellow, green and blue orange multicolor luminous.Ruddiness pipe operating voltage is less, and the operating voltage of red, orange, yellow, green, the blue light emitting diode that color is different raises successively.
Price
The price of LED is more and more popular, because of the characteristic of LED power saving, perhaps in the near future, people all can incandescent lamp is changed into LED.The places such as China's urban highway, school, plant area have changed the outfit LED street lamp, electricity-saving lamp etc.
Kind develops
The LED light source that application semiconductor P-N junction principle of luminosity is made the earliest was come out in early 1960s.Material used is at that time GaAsP, and glow (λ p=650nm), is 20 MAHs at drive current, and luminous flux only has a ppt lumen, corresponding luminescence efficiency about 0.1 lumens/watt.
The mid-1970s, introduces element In and N, and make LED produce green glow (λ p=555nm), gold-tinted (λ p=590nm) and orange light (λ p=610nm), light efficiency also brings up to 1 lumens/watt.
To the beginning of the eighties, there is the LED light source of GaAlAs, make the light efficiency of red LED reach 10 lumens/watt.
The beginning of the nineties, glow, the GaAlInP of gold-tinted and greening, blue light the succeeding in developing of GaInN two kinds of new materials, the light efficiency of LED is greatly enhanced.In 2000, the LED that the former makes reached 100 lumens/watt at the light efficiency of red, orange district (λ p=615nm), and the LED that the latter makes can reach 50 lumens/watt at the light efficiency of green area (λ p=530nm).
The application light emitting diode of monochromatic light LED
Initial LED is used as the instruction light source of instrument and meter, and various photochromic LED was widely applied in traffic lights and large-area displays screen afterwards, created good economic benefit and social benefit.For the red traffic light of 12 inches, be adopt the long-life originally in the U.S., 140 watts of incandescent lamps of low light efficiency are as light source, and it produces the white light of 2000 lumens.After Red lightscreening plate, light loss 90%, the only ruddiness of remaining 200 lumens.And in newly-designed lamp, Lumileds company have employed 18 red LED light source, comprise circuit loss, power consumption 14 watts altogether, can produce same light efficiency.
Automobile signal light is also the key areas of LED light source application.1987, China started to install high-mount stop lamp on automobile, due to LED fast response time (nanosecond), the driver of pursuit-type vehicle can be allowed early to know travel conditions, reduced the generation of rear-ended car accident.
In addition, LED is at outdoor red, green, blue full color display, and the fields such as key ring formula mini flashlight are obtained for application.
Parameter introduces several aspects important in the optical parametric of LED: luminous flux, luminescence efficiency, luminous intensity, light distribution, wavelength.
Luminescence efficiency and luminous flux
Luminescence efficiency is exactly luminous flux and the ratio of electric power.Luminescence efficiency characterizes the energy conservation characteristic of light source, and this is the important indicator weighing modern light source performance.
Luminous intensity and light distribution
LED luminous intensity is that to characterize its luminescence in a certain direction strong and weak, because LED is mutually far short of what is expected in different space angle light intensity, thereupon we have studied the light distribution characteristic of LED.This parameter practical significance is very large, directly has influence on the minimum viewing angle of LED display.The LED large colour display screen of such as stadiums, if the LED single tube distribution range selected is very narrow, the spectators that display screen is so in larger angle will see the civilian section picture of distortion.And traffic sign lamp also requires that people in a big way can identify.
Wavelength
For LED spectral characteristic we mainly see that whether its monochromaticity excellent, and it should be noted that whether the main color such as red, yellow, blue, green, White LED pure.Because in many situations, such as traffic lights require stricter to color relation, but some LED signal lamp Greens of China turn blue according to observations, and red is dark red, and from this phenomenon, we specialize in the spectral characteristic of LED is very necessary and highly significant.
Detect the detection of common light emitting diode
(1) detect with multimeter.Utilization has × and pointer multimeter that 10k Ω keeps off roughly can judge the quality of light emitting diode.Time normal, diode forward resistance is tens to 200k Ω, and the value of back resistance is ∝.If forward resistance value is 0 or for ∞, back resistance value is very little or be 0, then fragile.This detection method, can not see the luminous situation of luminotron substantially, because × 10k Ω gear can not provide larger forward current to LED.
If there are two block pointer multimeters (best same model) that the luminous situation of light emitting diode can be checked preferably.With a wire, wherein "+" binding post of one piece of multimeter is connected with "-" binding post of another block table.Remaining "-" pen connects the positive pole (P district) of tested luminotron, and remaining "+" pen connects the negative pole (N district) of tested luminotron.Two pieces of multimeters all put × and 10k Ω keeps off.Under normal circumstances, just can normal luminous after connecting.If it is not brightness is very low, even luminous, if two pieces of multimeters all can be allocated to × 1m Ω, if still very dark, even not luminous, then illustrate that this light emitting diode performance is bad or damage.It should be noted that to measure at the beginning and just two pieces of multimeters are placed in × 1m Ω, in order to avoid electric current is excessive, damage light emitting diode.
(2) external power supply is measured.Can compared with the optical and electrical properties of Measurement accuracy light emitting diode with the dry cell of 3V source of stable pressure or two joint series connection and multimeter (pointer-type or digital all can).For this reason can by connecting circuit shown in civilian section 10.If record VF between 1.4 ~ 3V, and luminosity is normal, can illustrate luminous normal.If record VF=0 or VF ≈ 3V, and not luminous, illustrate that luminotron is bad.
The detection of infrarede emitting diode
Due to infrarede emitting diode, it launches the infrared light of 1 ~ 3 μm, and eye be can't see.Usual single infrarede emitting diode emissive power only has several mW, and the infrared LED luminous intensity angle distribution of different model is not identical yet.The forward voltage drop of infrared LED is generally 1.3 ~ 2.5V.The infrared light people just launched due to it can not see, so utilize the detection method of above-mentioned visible LED to judge, whether the forward and reverse electrology characteristic of its PN junction is normal, and cannot judge that its luminous situation is normally no.For this reason, preferably prepare a photosensitive device (as 2CR, 2DR type silicon photocell) and make receiver.By the situation of change of multimeter light-metering battery both end voltage.Judge whether infrared LED launches infrared light after adding suitable forward current.
Measuring principle light intensity
Standard lamp of luminous intensity, LED and be furnished with V(λ) the silicon photoelectric diode installment and debugging of optical filter on optical bench, particularly strictly adjust filament position, LED luminous site and receiving surface position.
First calibrate silicon photoelectric diode with standard lamp of luminous intensity, C=E/S
Rs=Is/Ds in formula
Ds is the distance between standard lamp and receptacle, and I s is the light intensity of standard lamp, and R s is the response of standard lamp.
In Et=C R t formula, E t is the illumination of tested LED, and R t is the response of tested LED, then the light intensity I t of LED is: I t=E t Dt
In formula, Dt is the distance of LED and receiving surface.
For LED, its light-emitting area is dome shape, and Light distribation is very special, so under different measuring distances, light intensity value can change, deviation distance inverse square law, even if secure measuring distance, but due to receptacle receptor area difference, its light intensity value also can change.Therefore, in order to improve measuring accuracy, measuring distance and receptor area size relatively should be given to fix as well.Such as, measuring distance is recommended to adopt 316mm according to GIE, and receptacle area is fixed as 10 × 10mm.Under same measuring distance, LED corner is different, and its light intensity also correspondingly changes, and therefore in order to obtain optimum value, it is good for preferably reading full-scale reading R t.
1.3 road constant current output passages, constant current output does not affect 2. output current scopes by output terminal load voltage: 0 ~ 30mA 3. exemplary currents is 20mA, outer meeting resistance is that 620 Ω 4. Manchester communication interfaces 5. can support double-channel data transmission, the superpower cascade driving force of reliability 6. of raising system, the maximum cascade number of single line reaches 1,024 7.4096 grades of PWM GTGs and controls the sluggish 80ns of 8. output channel staggered times, system transients electric current and consequent noise are fallen 9. low to minimum accurate output current precision: between passage ± 1.5%, between chip ± and 3% 10. wider data transfer rate scopes: the operating voltage range that 100KHz ~ 1.5MHz is wider: 5 ~ 17V 11. low power consumption: the refresh rate that <100mW 12. is higher, PWM output frequency can reach the extremely strong antijamming capability of more than 1000Hz 13., ESD > 7KV.
Claims (8)
1. brand-new single wire transmission triple channel constant-current driven chip LED is that to characterize its luminescence in a certain direction strong and weak, because LED is mutually far short of what is expected in different space angle light intensity, thereupon we have studied the light distribution characteristic of LED;
This parameter practical significance is very large, directly has influence on the minimum viewing angle of LED display;
The LED large colour display screen of such as stadiums, if the LED single tube distribution range selected is very narrow, the spectators that display screen is so in larger angle will see the civilian section picture of distortion;
And traffic sign lamp also requires that people in a big way can identify;
Wavelength for LED spectral characteristic we mainly see that whether its monochromaticity excellent, and it should be noted that whether the main color such as red, yellow, blue, green, White LED pure;
Because in many situations, such as traffic lights require stricter to color relation, but some LED signal lamp Greens of China turn blue according to observations, and red is dark red, and from this phenomenon, we specialize in the spectral characteristic of LED is very necessary and highly significant;
Detect the detection of common light emitting diode
Detect with multimeter;
Utilization has × and pointer multimeter that 10k Ω keeps off roughly can judge the quality of light emitting diode;
Time normal, diode forward resistance is tens to 200k Ω, and the value of back resistance is ∝;
If forward resistance value is 0 or for ∞, back resistance value is very little or be 0, then fragile;
This detection method, can not see the luminous situation of luminotron substantially, because × 10k Ω gear can not provide larger forward current to LED;
If there are two block pointer multimeters (best same model) that the luminous situation of light emitting diode can be checked preferably;
With a wire, wherein "+" binding post of one piece of multimeter is connected with "-" binding post of another block table;
Remaining "-" pen connects the positive pole (P district) of tested luminotron, and remaining "+" pen connects the negative pole (N district) of tested luminotron;
Two pieces of multimeters all put × and 10k Ω keeps off;
Under normal circumstances, with regard to energy normal luminous after connecting;
If it is not brightness is very low, even luminous, if two pieces of multimeters all can be allocated to × 1m Ω, if still very dark, even not luminous, then illustrate that this light emitting diode performance is bad or damage;
It should be noted that to measure at the beginning and just two pieces of multimeters are placed in × 1m Ω, in order to avoid electric current is excessive, damage light emitting diode;
External power supply is measured;
Can compared with the optical and electrical properties of Measurement accuracy light emitting diode with the dry cell of 3V source of stable pressure or two joint series connection and multimeter (pointer-type or digital all can);
For this reason can by connecting circuit shown in civilian section 10;
If record VF between 1.4 ~ 3V, and luminosity is normal, can illustrate luminous normal;
If record VF=0 or VF ≈ 3V, and not luminous, illustrate that luminotron is bad;
The detection of infrarede emitting diode, due to infrarede emitting diode, it launches the infrared light of 1 ~ 3 μm, and eye be can't see.
2. brand-new single wire transmission triple channel constant-current driven chip LED usually single infrarede emitting diode emissive power only have several mW, the infrared LED luminous intensity angle distribution of different model is not identical yet;
The forward voltage drop of infrared LED is generally 1.3 ~ 2.5V;
The infrared light people just launched due to it can not see, so utilize the detection method of above-mentioned visible LED to judge, whether the forward and reverse electrology characteristic of its PN junction is normal, and cannot judge that its luminous situation is normally no;
For this reason, preferably prepare a photosensitive device (as 2CR, 2DR type silicon photocell) and make receiver;
By the situation of change of multimeter light-metering battery both end voltage;
Judge whether infrared LED launches infrared light after adding suitable forward current;
Measuring principle light intensity
Standard lamp of luminous intensity, LED and be furnished with V(λ) the silicon photoelectric diode installment and debugging of optical filter on optical bench, particularly strictly adjust filament position, LED luminous site and receiving surface position;
Detect with multimeter; Utilization has × and pointer multimeter that 10k Ω keeps off roughly can judge the quality of light emitting diode; Time normal, diode forward resistance is tens to 200k Ω, and the value of back resistance is ∝;
If forward resistance value is 0 or for ∞, back resistance value is very little or be 0, then fragile;
This detection method, can not see the luminous situation of luminotron substantially, because × 10k Ω gear can not provide larger forward current to LED;
If there are two block pointer multimeters (best same model) that the luminous situation of light emitting diode can be checked preferably; With a wire, wherein "+" binding post of one piece of multimeter is connected with "-" binding post of another block table; Remaining "-" pen connects the positive pole (P district) of tested luminotron, and remaining "+" pen connects the negative pole (N district) of tested luminotron.
3. two pieces of multimeters all put × 10k Ω keeps off; Under normal circumstances, just can normal luminous after connecting.
If it is not 4. brand-new single wire transmission triple channel constant-current driven chip LED brightness is very low, even luminous, if two pieces of multimeters all can be allocated to × 1m Ω, if still very dark, even not luminous, then illustrate that this light emitting diode performance is bad or damage; It should be noted that to measure at the beginning and just two pieces of multimeters are placed in × 1m Ω, in order to avoid electric current is excessive, damage light emitting diode;
External power supply is measured; Can compared with the optical and electrical properties of Measurement accuracy light emitting diode with the dry cell of 3V source of stable pressure or two joint series connection and multimeter (pointer-type or digital all can);
For this reason can by connecting circuit shown in civilian section 10;
If record VF between 1.4 ~ 3V, and luminosity is normal, can illustrate luminous normal;
If record VF=0 or VF ≈ 3V, and not luminous, illustrate that luminotron is bad;
The detection of infrarede emitting diode
Due to infrarede emitting diode, it launches the infrared light of 1 ~ 3 μm, and eye be can't see;
Usual single infrarede emitting diode emissive power only has several mW, and the infrared LED luminous intensity angle distribution of different model is not identical yet; The forward voltage drop of infrared LED is generally 1.3 ~ 2.5V;
The infrared light people just launched due to it can not see, so utilize the detection method of above-mentioned visible LED to judge, whether the forward and reverse electrology characteristic of its PN junction is normal, and cannot judge that its luminous situation is normally no;
For this reason, preferably prepare a photosensitive device (as 2CR, 2DR type silicon photocell) and make receiver; By the situation of change of multimeter light-metering battery both end voltage;
Judge whether infrared LED launches infrared light after adding suitable forward current;
Measuring principle light intensity
Standard lamp of luminous intensity, LED and be furnished with V(λ) the silicon photoelectric diode installment and debugging of optical filter on optical bench, particularly strictly adjust filament position, LED luminous site and receiving surface position;
First calibrate silicon photoelectric diode with standard lamp of luminous intensity, C=E/S
Rs=Is/Ds in formula
Ds is the distance between standard lamp and receptacle, and I s is the light intensity of standard lamp, and R s is the response of standard lamp;
In Et=C R t formula, E t is the illumination of tested LED, and R t is the response of tested LED, then the light intensity I t of LED is: I t=E t Dt
In formula, Dt is the distance of LED and receiving surface;
For LED, its light-emitting area is dome shape, and Light distribation is very special, so under different measuring distances, light intensity value can change, deviation distance inverse square law, even if secure measuring distance, but due to receptacle receptor area difference, its light intensity value also can change.
5. brand-new single wire transmission triple channel constant-current driven chip LED is in order to improve measuring accuracy, measuring distance and receptor area size relatively should be given to fix as well.
6. brand-new single wire transmission triple channel constant-current driven chip LED measuring distance is recommended to adopt 316mm according to GIE, and receptacle area is fixed as 10 × 10mm;
Under same measuring distance, LED corner is different, and its light intensity also correspondingly changes, and therefore in order to obtain optimum value, it is good for preferably reading full-scale reading R t.
7. for LED spectral characteristic we mainly see that whether its monochromaticity excellent, and it should be noted that whether the main color such as red, yellow, blue, green, White LED pure.
8. because in many situations, such as traffic lights require stricter to color relation, but some LED signal lamp Greens of China turn blue according to observations, and red is dark red, and from this phenomenon, we specialize in the spectral characteristic of LED is very necessary and highly significant;
Detect the detection of common light emitting diode
Novel TLS3001 type LED multimeter detects; Utilization has × and pointer multimeter that 10k Ω keeps off roughly can judge the quality of light emitting diode; Time normal, diode forward resistance is tens to 200k Ω, and the value of back resistance is ∝; If forward resistance value is 0 or for ∞, back resistance value is very little or be 0, then fragile;
This detection method, can not see the luminous situation of luminotron substantially, because × 10k Ω gear can not provide larger forward current to LED;
If there are two block pointer multimeters (best same model) that the luminous situation of light emitting diode can be checked preferably; With a wire, wherein "+" binding post of one piece of multimeter is connected with "-" binding post of another block table; Remaining "-" pen connects the positive pole (P district) of tested luminotron, and remaining "+" pen connects the negative pole (N district) of tested luminotron;
Two pieces of multimeters all put × and 10k Ω keeps off; Under normal circumstances, with regard to energy normal luminous after connecting;
If it is not brightness is very low, even luminous, if two pieces of multimeters all can be allocated to × 1m Ω, if still very dark, even not luminous, then illustrate that this light emitting diode performance is bad or damage;
It should be noted that to measure at the beginning and just two pieces of multimeters are placed in × 1m Ω, in order to avoid electric current is excessive, damage light emitting diode;
External power supply is measured; Can compared with the optical and electrical properties of Measurement accuracy light emitting diode with the dry cell of 3V source of stable pressure or two joint series connection and multimeter (pointer-type or digital all can);
For this reason can by connecting circuit shown in civilian section 10; If record VF between 1.4 ~ 3V, and luminosity is normal, can illustrate luminous normal;
If record VF=0 or VF ≈ 3V, and not luminous, illustrate that luminotron is bad;
The detection of infrarede emitting diode
Due to infrarede emitting diode, it launches the infrared light of 1 ~ 3 μm, and eye be can't see; Usual single infrarede emitting diode emissive power only has several mW, and the infrared LED luminous intensity angle distribution of different model is not identical yet; The forward voltage drop of infrared LED is generally 1.3 ~ 2.5V;
The infrared light people just launched due to it can not see, so utilize the detection method of above-mentioned visible LED to judge, whether the forward and reverse electrology characteristic of its PN junction is normal, and cannot judge that its luminous situation is normally no;
For this reason, preferably prepare a photosensitive device (as 2CR, 2DR type silicon photocell) and make receiver; By the situation of change of multimeter light-metering battery both end voltage;
Judge whether infrared LED launches infrared light after adding suitable forward current;
Measuring principle light intensity
Standard lamp of luminous intensity, LED and be furnished with V(λ) the silicon photoelectric diode installment and debugging of optical filter on optical bench, particularly strictly adjust filament position, LED luminous site and receiving surface position;
Brand-new single wire transmission triple channel constant-current driven chip LED road constant current output passage, constant current output does not affect 2. output current scopes by output terminal load voltage: 0 ~ 30mA 3. exemplary currents is 20mA, outer meeting resistance is that 620 Ω 4. Manchester communication interfaces 5. can support double-channel data transmission, the superpower cascade driving force of reliability 6. of raising system, the maximum cascade number of single line reaches 1,024 7.4096 grades of PWM GTGs and controls the sluggish 80ns of 8. output channel staggered times, system transients electric current and consequent noise are fallen 9. low to minimum accurate output current precision: between passage ± 1.5%, between chip ± and 3% 10. wider data transfer rate scopes: the operating voltage range that 100KHz ~ 1.5MHz is wider: 5 ~ 17V 11. low power consumption: the refresh rate that <100mW 12. is higher, PWM output frequency can reach the extremely strong antijamming capability of more than 1000Hz 13., ESD > 7KV.
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| CN201310673355.2A CN104714163A (en) | 2013-12-12 | 2013-12-12 | Brand-new single-line transmission three-channel constant-current driving chip LED epitaxial wafer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106247189A (en) * | 2016-10-18 | 2016-12-21 | 安徽瑞雪照明股份有限公司 | A kind of energy-saving lighting lamp with function of driving mosquitoes |
| CN112135012A (en) * | 2019-06-25 | 2020-12-25 | 杭州海康威视数字技术股份有限公司 | Image acquisition device and image acquisition method |
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2013
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106247189A (en) * | 2016-10-18 | 2016-12-21 | 安徽瑞雪照明股份有限公司 | A kind of energy-saving lighting lamp with function of driving mosquitoes |
| CN112135012A (en) * | 2019-06-25 | 2020-12-25 | 杭州海康威视数字技术股份有限公司 | Image acquisition device and image acquisition method |
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Application publication date: 20150617 |