CN103517532A - LED automobile headlight with adjustable brightness and color temperature - Google Patents
LED automobile headlight with adjustable brightness and color temperature Download PDFInfo
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- CN103517532A CN103517532A CN201310497268.6A CN201310497268A CN103517532A CN 103517532 A CN103517532 A CN 103517532A CN 201310497268 A CN201310497268 A CN 201310497268A CN 103517532 A CN103517532 A CN 103517532A
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Abstract
The invention discloses an LED automobile headlight with adjustable brightness and color temperature. The LED automobile headlight comprises a working power supply, a protective circuit, a control circuit, a sampling circuit, an LED array and a Buck-Boost circuit; the working power supply, the protective circuit, the Buck-Boost circuit and the LED array are connected with one another sequentially; the input end of the sampling circuit is connected with the LED array, and the output end of the sampling circuit is connected with the control circuit; the output end of the control circuit is respectively connected with the protective circuit and the Buck-Boost circuit; the LED array comprises a high-power blue light wafer, a medium-power yellow light wafer and a low-power red light wafer; fluorescent glue is adopted to realize surface packing of the LED array; the blue light wafer, the yellow light wafer and the red light wafer are connected in parallel to form three circuit loops. The automobile headlight can meet requirements of the automobile headlight on various luminous conditions, and is adjustable in brightness and color temperature, reasonable in design logic, safe, reliable, and low in manufacturing cost.
Description
Technical field
The present invention relates to a kind of LED car light, be specifically related to a kind of LED automobile front that can brightness adjusting colour temperature.
Background technology
Since nineteen sixty, first commercial diode was born, LED technology is that its Display Technique or its lighting technology have all obtained huge lifting.It is that illuminating engineerings efficient, energy-saving and environmental protection have been brought hope from now on.LED claims again light-emitting diode, and they utilize solid semiconductor chip to add forward voltage as luminescent material ，Dang two ends, and charge carrier in semiconductor occurs compound, emits superfluous energy and causes that photo emissions produces visible ray.The wafer that the substantive structure of light-emitting diode is comprised of P type semiconductor and N type semiconductor has a transition zone between P type semiconductor and N type semiconductor, is called PN knot.At semi-conductive PN, tie and add forward voltage, PN junction barrier reduces, and N district obtains electronics and P district and obtains hole and cross respectively potential barrier and enter P district and N district, and the minority carrier of injection and majority carrier are at compound tense, unnecessary energy with the form spoke of light out, converts electrical energy into luminous energy.
Colour temperature definition: the color of source emissioning light and black matrix be the radiant light form and aspect while at a certain temperature, and the temperature of black matrix is called the colour temperature of this light source.LED colour temperature is to represent with absolute temperature K, is about to a standard black matrix heating, and when temperature is elevated to a certain degree, color starts by dark red-pale red-orange-Bai-indigo plant, changes gradually, and Here it is, and we often say that colour temperature is adjustable.When the color of certain light source and black matrix is identical, the light source of black matrix absolute temperature at that time.By regulating colour temperature can make LED send the light of different colours, the dark red light penetration to blue temperature dies down gradually.
From the applicating history of LED, in the time of 1992, there is LED to be applied to the precedent on the 3rd stop lamp; In the time of 2000, be further applied to taillight, direction indicator lamp and stop lamp; To Audi A8 in 2002 take the lead in LED light source is placed in preposition light fixture, as a day portable lighter, having opened designer and engineers in the imagination space of preposition light fixture.After many International Auto Shows on can see that LED is as the concept car in headlamp source.
The present situation of the development of domestic LED car light:
Automobile LED lamp is the utilization rate less than 1% on automobile at home, has compared larger gap with countries such as automobile LED lamp utilization rate Da30% Switzerland.The principal manufacturer that manufactures at present LED auto lamp has: Philip illumination, light science and technology, and converge sincere photoelectricity ... etc. many specialties, manufacture business men.Continuous renewal and LED car light state-of-the-art and trend along with LED technology, China LED high-mount brake lamp will further be popularized, price declines steadily, LED rear brake lamp, direction indicator lamp and fog lamp start commercialization, LED automobile lamp is to personalized and art up future development, and LED intelligent control system is also by fast development simultaneously.
Global Auto conventional light source illuminations in 2012 account for 10% left and right of whole lighting source total output, and therefore automobile-used market is that the LED illumination being expected most segments market.LED has been applied to automotive interior and outside at present, and especially at interior automotive lighting, the application of color LED is very ripe, such as using instrument panel lamp, back lighting switch, automobile reading lamp or head-up-display system etc.; Automobile external, is mainly combined LED taillight, and for example stop lamp, direction indicator lamp, parking lamp combine.But LED using vehicle headlamp is still challenging, it is the optical characteristics that LED is different from orthodox car light source, while making LED be applied to headlamp, to face complicated optical design, and also formally not put into effect the relevant criterion of LED car headlamp both at home and abroad; Be that LED headlamp is still in development.Yet LED is applied to the trend that is inevitable on the headlight of automobile, this just needs us for the characteristic of automobile front, proposes a kind of reliable LED type of drive and the adjustable technical scheme of LED brightness colour temperature.
Summary of the invention
The object of the present invention is to provide and a kind ofly can meet that automobile front is reasonable, safe and reliable, simple in structure to the demand of various lighting environments, design logic that LED brightness colour temperature is adjustable, the LED automobile front of low cost of manufacture.
To achieve these goals, the present invention has adopted following technical scheme:
The LED automobile front that colour temperature is adjustable, comprises working power, protective circuit, control circuit, sample circuit and LED array; Wherein, also comprise Buck-Boost circuit; Described working power, protective circuit, Buck-Boost circuit, LED array connect successively; The input of described sample circuit is connected with LED array, and output is connected with control circuit; The output of described control circuit is connected with protective circuit, Buck-Boost circuit respectively; Described LED array comprises gold-tinted wafer and the low power red wafer of powerful blue light wafer, middle power, and adopts fluorescent glue to encapsulate on LED array surface; Described blue light wafer, gold-tinted wafer and red wafer are in parallel, form three circuit loops.
In the present invention, high-power, middle power, low power led power range values refer to general conventional division.As high-power LED refers generally to led more than 1W; Small-power led is common led, refers generally to the led of more than zero watts of left and right at zero point; Middle power led is between between the above two, as the led at several watts of zero points.
In circuit design of the present invention, the drive circuit of LED has adopted Buck-Boost circuit topological structure to meet the requirement of LED array to voltage.In this circuit topological structure DC current gain (output voltage and input voltage ratio) and switch periods of duty ratio D(, the ratio in service time and cycle) relevant.When cell voltage is during lower than LED required voltage, regulate D>0.5, make circuit in pressure-increasning state; When cell voltage is during higher than LED required voltage, regulate D<0.5, make circuit in step-down state.LED is the current mode element of Current Control, and brightness is directly proportional to the electric current flowing through, and by changing current fluctuation, can make the brightness of voltage LED change.And LED array has adopted a high-power blue light wafer, middle power red wafer and a small-power gold-tinted wafer integration packaging and has adopted fluorescent material mode of excitation to obtain the white light LEDs of high light flux, high-color rendering; On horizontal high-power base, consolidating respectively high-power blue light, middle power gold-tinted and a small-power ruddiness, three wafers adopt respectively three current circuits, again at its surface encapsulation fluorescent glue, blue light wafer fluorescence excitation glue produces colour temperature at the positive white light of 6000K left and right, thereby to realize the white light colour temperature of 2700k～10000k adjustable by controlling the electric current of gold-tinted wafer; Thereby it is adjustable by the electric current of control red wafer, to realize the photochromic aobvious index of white.Thereby it is adjustable by control size of current, to realize 0～100% brightness.
As the present invention, further improve, this LED automobile front also comprises the hard-wired radiator of circuit board with blue light wafer.
As further illustrating of technique scheme of the present invention, above-mentioned radiator adopts aluminium radiator, and is also filled with one deck heat-conducting medium between radiator and the circuit board of blue light wafer.The heat producing during LED work is transmitted on the good aluminium radiator of pyroconductivity via circuit board by conduction pattern, and the fin of aluminium radiator contacts heat is distributed and come with air large area; Fill heat-conducting medium therebetween, can more effectively reduce the thermal resistance between radiator and circuit board.Heat-conducting medium adopts the conventional Heat Conduction Material in this area, as heat-conducting silica gel sheet, heat-conducting silicone grease etc.
As the further improvement of technique scheme of the present invention, near radiator, be also provided with a fan.Install fan additional and carry out forced convertion, can alleviate the inhomogeneous situation of radiator temperature, realize better radiating effect.The suitable big-and-middle-sized car type of this heat sink conception.Such as: truck; Motor bus etc.
As further illustrating of technique scheme of the present invention, above-mentioned radiator adopts semiconductor chilling plate; The cold end contact of the circuit board of described blue light wafer and semiconductor chilling plate is installed.When adopting semiconductor chilling plate as radiator, we can also install a temperature sensor additional on its cold junction face, connect an intelligent temperature control circuit, can realize the temperature of LED lamp is kept within the specific limits.Qi hot junction face can install fan additional forces forced convertion, accelerates heat radiation.This heat sink conception suitable little in-between car, particularly high-grade car.Intelligent temperature control circuit can be fused in the intrinsic control circuit of the present invention, also can arrange separately, is connected in parallel in circuit of the present invention with intrinsic control circuit.
Semiconductor chilling plate (TE) be also thermoelectric module, is a kind of heat pump, and its advantage is there is no slide unit, is applied in some spaces and is restricted, and reliability requirement is high, the occasion of polluting without cold-producing medium.The metal connecting sheet galvanic couple pair that is welded for the particle of a N-type and P type semiconductor.When direct current flows to P Ji Shi， upper end from the N utmost point, produce heat absorption phenomenon, if this end claims cold junction, lower end produces the exothermic phenomenon ，Ci Duancheng hot junction sense of current conversely below, and cold and hot end is changed mutually.Because a galvanic couple produces thermal effect less (general about IKcal/h) so in fact by tens.The thermoelectric piles that galvanic couple is unified into up to a hundred.So semi-conductive refrigeration is one end heat absorption one end heat release, be to flow through node by charge carrier (electronics and hole), the energy being caused by the variation of potential energy transmits, and this is the essence of conductor refrigeration, i.e. peltier effect.
Semiconductor chilling plate is as radiator, in technology application, there is following advantage and disadvantage: 1. without any need for cold-producing medium, can continuous operation, do not have pollutant sources there is no rotating parts, can not produce gyroscopic action, there is no slide unit is a kind of solid piece part, does not have vibrations, noise, life-span long during work, installs easily.2. semiconductor chilling plate is electric current transducing matrix part, by the control of input current, can realize high-precision temperature and control, and adds temperature measurement and control means, is easy to realize remote control, program control, computer control, is convenient to form automatic control system.3. semiconductor chilling plate thermal inertia is very little, and the cooling and warming time is very fast, and the in the situation that of the good cold junction zero load of hot-side heat dissipation, energising was less than one minute, and cooling piece just can reach maximum temperature difference.4. the temperature range of semiconductor chilling plate, can realize to 130 ℃ of negative temperatures from 90 ℃ of positive temperature.
As further illustrating of technique scheme of the present invention, above-mentioned working power adopts storage battery.
In the present invention, the circuit design of protective circuit and sample circuit adopts common design, as long as can realize corresponding circuit function.Control circuit is the control circuit based on pwm chip design, and its circuit structure design is also the common design that adopts this area.
Operation principle of the present invention: Buck-Boost circuit will be powered to LED array after the conversion of storage battery electric energy, and sample circuit, to flowing through the current sample of LED, passes to control circuit by signal.Control circuit analytical sampling information, in adjusting Buck-Boost circuit, the duty ratio of switching tube, guarantees by LED current constant; When abnormal, cutting off the electricity supply by control protection electric circuit appears in circuit, guarantee that LED is without prejudice.
Advantage of the present invention:
1. in technical scheme of the present invention, we have adopted Buck-Boost circuit as drive circuit, and have adopted a high-power blue light wafer, middle power red wafer and a small-power gold-tinted wafer integration packaging and adopted fluorescent material mode of excitation to obtain the white light LEDs of high light flux, high-color rendering; Thereby can meet the demand of automobile front to various lighting environments, can be according to road conditions brightness adjusting and colour temperature, solved the contradiction that conventional light source can only brightness adjusting can not regulate colour temperature.Such as: the good urban pavement of road conditions in evening regulates light partially white, strengthens degree of getting a clear view; Dense fog section can be heightened the brightness of LED headlight, and the partially yellow penetrability of strengthening light of color, increases visual field distance.Even can cancel traditional fog lamp, cost-saving.
2. aluminium radiator or semiconductor chilling plate have been installed in the present invention additional, efficiently solve the heat dissipation problem of high-powered LED lamp, extend its service time, guarantee the stability of its work.
3. product has possessed feature and the advantage of LED itself: (1): the life-span is long, generally can reach several ten thousand and even 100,000 hours.Someone thinks that whole automobile useful life need not be changed light fixture if following car lighting lamp is used LED.(2): high efficiency, low energy consumption.LED light source does not need colour filter just can directly produce the redness of automobile lamp needs, the color such as amber, and lossless, utilization rate of electrical is up to more than 80%.(3) light quality is high, belongs to the essentially no radiation of environment-friendly products, " green " light source.(4) LED's is simple in structure, internal carrier structure, and transparent epoxy sealing for surrounding, anti-seismic performance is good.(5) light without postponing bright light fast response time.(6) applicable low voltage operating.
It is little that 4.LED takies volume, and designer can arbitrarily convert light fixture pattern, makes vehicle configuration variation.
Accompanying drawing explanation
Fig. 1 is schematic block circuit diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further described.
Embodiment 1:
As shown in Figure 1, the LED automobile front that a kind of brightness colour temperature is adjustable, comprises storage battery, protective circuit, control circuit, sample circuit, LED array and Buck-Boost circuit; Described storage battery, protective circuit, Buck-Boost circuit, LED array connect successively; The input of described sample circuit is connected with LED array, and output is connected with control circuit; The output of described control circuit is connected with protective circuit, Buck-Boost circuit respectively; Described LED array comprises gold-tinted wafer and the low power red wafer of powerful blue light wafer, middle power, and adopts fluorescent glue to encapsulate on LED array surface; Described blue light wafer, gold-tinted wafer and red wafer are in parallel, form three circuit loops.
Embodiment 2:
The difference of the present embodiment and embodiment 1 is: this LED automobile front also comprises the hard-wired radiator of circuit board with blue light wafer.Described radiator adopts aluminium radiator, and is also filled with one deck heat-conducting medium between radiator and the circuit board of blue light wafer.Near radiator, be also provided with a fan.
Embodiment 3:
The difference of the present embodiment and embodiment 1 is: this LED automobile front also comprises the hard-wired radiator of circuit board with blue light wafer.Described radiator adopts semiconductor chilling plate; The cold end contact of the circuit board of described blue light wafer and semiconductor chilling plate is installed.
Embodiment 4:
The difference of the present embodiment and embodiment 3 is: on the cold junction face of semiconductor chilling plate, install a temperature sensor additional, and set up an intelligent temperature control circuit, can realize the temperature of LED lamp is kept within the specific limits; Qi hot junction face can install fan additional and carry out forced convertion, accelerates heat radiation.
Claims (6)
1. the LED automobile front that brightness colour temperature is adjustable, comprises working power, protective circuit, control circuit, sample circuit and LED array; It is characterized in that: also comprise Buck-Boost circuit; Described working power, protective circuit, Buck-Boost circuit, LED array connect successively; The input of described sample circuit is connected with LED array, and output is connected with control circuit; The output of described control circuit is connected with protective circuit, Buck-Boost circuit respectively; Described LED array comprises gold-tinted wafer and the low power red wafer of powerful blue light wafer, middle power, and adopts fluorescent glue to encapsulate on LED array surface; Described blue light wafer, gold-tinted wafer and red wafer are in parallel, form three circuit loops.
2. the adjustable LED automobile front of brightness colour temperature according to claim 1, is characterized in that: this LED automobile front also comprises the hard-wired radiator of circuit board with blue light wafer.
3. the adjustable LED automobile front of brightness colour temperature according to claim 2, is characterized in that: described radiator adopts aluminium radiator, and is also filled with one deck heat-conducting medium between radiator and the circuit board of blue light wafer.
4. the LED automobile front adjustable according to the brightness colour temperature described in claim 2 or 3, is characterized in that: near radiator, be also provided with a fan.
5. the adjustable LED automobile front of brightness colour temperature according to claim 2, is characterized in that: described radiator adopts semiconductor chilling plate; The cold end contact of the circuit board of described blue light wafer and semiconductor chilling plate is installed.
6. according to claim 1-3,5 arbitrary described adjustable LED automobile fronts of brightness colour temperature, is characterized in that: described working power adopts storage battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310497268.6A CN103517532A (en) | 2013-10-22 | 2013-10-22 | LED automobile headlight with adjustable brightness and color temperature |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310497268.6A CN103517532A (en) | 2013-10-22 | 2013-10-22 | LED automobile headlight with adjustable brightness and color temperature |
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| CN103517532A true CN103517532A (en) | 2014-01-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310497268.6A Pending CN103517532A (en) | 2013-10-22 | 2013-10-22 | LED automobile headlight with adjustable brightness and color temperature |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107864531A (en) * | 2017-10-31 | 2018-03-30 | 马瑞利汽车零部件(芜湖)有限公司 | The four-way electronic control system of vehicle light illumination control |
| CN109688663A (en) * | 2019-01-24 | 2019-04-26 | 深圳中电数码显示有限公司 | A kind of colour temperature adjusts circui, circuit board, teaching one-piece |
| CN112406689A (en) * | 2020-10-30 | 2021-02-26 | 恒大新能源汽车投资控股集团有限公司 | Vehicular headlamp system, vehicular headlamp control method, vehicular headlamp control device, and storage medium |
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| CN101815382A (en) * | 2010-04-02 | 2010-08-25 | 上海小糸车灯有限公司 | Step-down constant current LED drive circuit for automobile lighting |
| CN202082633U (en) * | 2011-04-02 | 2011-12-21 | 英飞特电子（杭州）有限公司 | Flashlight |
| CN102506367A (en) * | 2011-11-17 | 2012-06-20 | 郑伟 | Led automobile headlamp light source and manufacturing method thereof |
| CN203523109U (en) * | 2013-10-22 | 2014-04-02 | 柳州天运寰通科技有限公司 | LED automobile headlight with adjustable brightness and adjustable color temperature |
-
2013
- 2013-10-22 CN CN201310497268.6A patent/CN103517532A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101815382A (en) * | 2010-04-02 | 2010-08-25 | 上海小糸车灯有限公司 | Step-down constant current LED drive circuit for automobile lighting |
| CN202082633U (en) * | 2011-04-02 | 2011-12-21 | 英飞特电子（杭州）有限公司 | Flashlight |
| CN102506367A (en) * | 2011-11-17 | 2012-06-20 | 郑伟 | Led automobile headlamp light source and manufacturing method thereof |
| CN203523109U (en) * | 2013-10-22 | 2014-04-02 | 柳州天运寰通科技有限公司 | LED automobile headlight with adjustable brightness and adjustable color temperature |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107864531A (en) * | 2017-10-31 | 2018-03-30 | 马瑞利汽车零部件(芜湖)有限公司 | The four-way electronic control system of vehicle light illumination control |
| CN109688663A (en) * | 2019-01-24 | 2019-04-26 | 深圳中电数码显示有限公司 | A kind of colour temperature adjusts circui, circuit board, teaching one-piece |
| CN109688663B (en) * | 2019-01-24 | 2021-05-07 | 深圳中电数码显示有限公司 | Color temperature adjusting circuit, circuit board and teaching all-in-one machine |
| CN112406689A (en) * | 2020-10-30 | 2021-02-26 | 恒大新能源汽车投资控股集团有限公司 | Vehicular headlamp system, vehicular headlamp control method, vehicular headlamp control device, and storage medium |
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Application publication date: 20140115 |