CN108738196A - Automatically keep the constant lighting lamp device of illumination contrast - Google Patents
Automatically keep the constant lighting lamp device of illumination contrast Download PDFInfo
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- CN108738196A CN108738196A CN201810374752.2A CN201810374752A CN108738196A CN 108738196 A CN108738196 A CN 108738196A CN 201810374752 A CN201810374752 A CN 201810374752A CN 108738196 A CN108738196 A CN 108738196A
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- receiving tube
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- 238000005286 illumination Methods 0.000 title claims abstract description 77
- 230000008859 change Effects 0.000 claims abstract description 7
- 230000003044 adaptive effect Effects 0.000 claims description 16
- 230000005622 photoelectricity Effects 0.000 claims description 4
- 230000035945 sensitivity Effects 0.000 claims description 4
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- 238000010586 diagram Methods 0.000 description 9
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- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000005693 optoelectronics Effects 0.000 description 2
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Classifications
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- 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]
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Abstract
The constant lighting lamp device of illumination contrast is automatically kept the invention discloses a kind of.Resistance R1 connection supply voltages VCC, resistance R1 is connected with photoelectric receiving tube D1, resistance R2 respectively, triode Q1 base stages are connected with resistance R2, photoelectric receiving tube D1 ground connection, the collector of triode Q1 are connected with resistance R3, resistance R5, and the emitter-base bandgap grading of triode Q1 is connected through resistance R4 to be grounded, resistance R3 connection supply voltages VCC, the base stage of triode Q2 is connected with resistance R5, and the collector of triode Q2 is connect through headlamp D2 with supply voltage VCC, the emitter grounding of triode Q2.The invention enables in the region of headlamp uniform irradiation illuminance contrast with respect to change absolute value be no more than 2.6%；The application scenario of applicable varying environment illuminance and illumination region area；Circuit cost is cheap, simple and reliable and capacity usage ratio is high, has actual application value.
Description
Technical field
The present invention relates to intelligent display projection fields, and the constant photograph of illumination contrast is automatically kept more particularly, to a kind of
Bright lamp device.
Background technology
Screen display and image projecting are widely used in the fields such as commercial office, industrial production and life & amusement, the sector
With vast potential for future development.Report display, global smart mobile phone shipment amount is as high as 14.62 hundred million within only 2017, most of
Mobile phone all has the function of that screen intensity is adjusted according to ambient light.When ambient light is stronger, enhancing illumination illuminance can
Holding displays contrast, and improves reading comfort sense；When ambient light is stronger, illumination illuminance, too strong illumination light should be reduced
Human eye health can be not only endangered, product power consumption is also added.With the continuous development of society, demand of the mankind to the energy be increasingly
Greatly, current energy crisis aggravates so that all trades and professions have to take into account that energy saving, and low-power consumption has become the pass for weighing every technology
Key index.Therefore reasonable, the reliable and stable adaptive optical of development cost has important practical significance according to contrast adjustment technology.
Invention content
Extensive present situation is used for the display shadow casting technique that adaptive illumination is adjusted.The present invention proposes a kind of automatic guarantor
Hold the constant lighting lamp device of illumination contrast.
Specific technical solution of the present invention is as follows：
One, a kind of to automatically keep the constant lighting lamp device of illumination contrast：
Including adaptive lighting circuit and adaptive light structures, adaptive lighting circuit includes photoelectric receiving tube D1, electricity
Hinder R1, R2, R3, R4 and R5, triode Q1, Q2 and headlamp D2；The one end resistance R1 connects supply voltage VCC, and resistance R1 is another
End is connected with one end of photoelectric receiving tube D1, resistance R2 respectively, and triode Q1 base stages are connected with the other end of resistance R2, and photoelectricity connects
The other end of closed tube D1 is grounded, and the collector of triode Q1 is connected with one end of resistance R3, resistance R5, the emitter-base bandgap grading warp of triode Q1
Resistance R4, which is connected, to be grounded, and the other end of resistance R3 connects supply voltage VCC, the other end of the base stage and resistance R5 of triode Q2
It is connected, the collector of triode Q2 is connect through headlamp D2 with supply voltage VCC, the emitter grounding of triode Q2.
In the present invention, photoelectric receiving tube D1, resistance R3 and headlamp D2 are connected with supply voltage VCC, resistance R1 and R4
It is grounded.Supply voltage VCC is equivalent to positive pole, and ground is equivalent to power cathode.
Photoelectric receiving tube is added in the present invention in existing headlamp and triode constitutes adaptive lighting circuit, ambient lighting
Houselights illumination enhances when degree enhancing, and houselights illumination weakens when ambient light illumination weakens, to keep illumination contrast
(the ratio between houselights illumination and ambient light illumination) is constant, realizes and automatically keeps the constant effect of illumination contrast.
The present invention is provided with adaptive light structures, and the adaptive light structures include：Photoelectric receiving tube D1 is placed
At the shade (region i.e. other than houselights range of exposures) of headlamp D2.
The photoelectric receiving tube D1 reverse bias is arranged between supply voltage VCC and ground, and photoelectric receiving tube D1's is negative
The positive terminal ground connection of extreme connection resistance R1, photoelectric receiving tube D1.
The collector of the triode Q2 is connect with the negative pole end of headlamp D2, and the positive terminal of headlamp D2 connects power supply
Voltage VCC.
The headlamp D2 is to convert electrical energy into luminous energy and VA characteristic curve has the characteristics that the device of class constant pressure, packet
Include but be not limited to light emitting diode, LED light etc..
The photoelectric receiving tube D1 is the device converted light into as electric current, including but not limited to photodiode, photoelectricity
Triode etc..
The supply voltage VCC is DC constant voltage power supply.
The triode Q1 and Q2 is NPN type triode.
The device of the photoelectric receiving tube D1, resistance R1, R2, R3, R4 and R5, triode Q1, Q2 and headlamp D2 are adopted
It is configured with following formula, realizes illumination contrast adaptive constant：
Since headlamp VA characteristic curve has the characteristics that approximate constant voltage, illumination voltage of both ends of lamp approximation take in conducting region
Device constant pressure value Vc2.Ambient light illumination φeIn 0~φe,maxBetween change, keep the illumination contrast ε of irradiated planea=φe/
φiPerseverance is fixed value εa0, φiIndicate the illuminance of irradiated plane, illumination voltage of both ends of lamp constant pressure value Vc2Meet：
VCC-Vc2≥Vce0 (1)
Wherein, VCC is supply voltage, Vce0The saturation voltage between the collection emitter-base bandgap grading of single triode, triode in specific implementation
The model of Q1 and Q2 is identical, and η indicates headlamp to the luminous efficiency of irradiation area, and every watt of unit lumen, R3 and R5 are indicated respectively
The resistance value of resistance R3 and R5；
Also, the resistance value R3 and R5 of resistance R3 and R5 meet：
VCC-Vbe-φe,maxεa0A/(ηVc2) (R3+R5)/β=0 (2)
Wherein, φa0Indicate the illuminance φ of irradiated planeaSteady state value, β be single triode current DC gain,
VbeVoltage across poles is penetrated for the base of single triode, A indicates irradiated area；
Also, the resistance value R1 and R2 of R4=0, resistance R1 and R2 meet：
Wherein, R1 and R2 indicates the resistance value of resistance R1 and R2, φ respectivelye,maxIndicate that the maximum value of ambient light illumination, S indicate
Photoelectric receiving tube D1 sensitivity, unit ampere is per lux.
The above principle chosen to circuit devcie in attached drawing 1 is summarized, photoelectric receiving tube D1 and triode Q1, Q2 are unlimited, shine
The V of bright lamp D2c2It is limited to formula (1).
The present invention, which is configured each device by above-mentioned formula, can realize that automatically keep illuminance constant.
The beneficial effects of the invention are as follows：
The present invention solves headlamp and realizes the technical issues of automatic adjustment of illumination contrast is kept constant, and improves illumination
The illumination contrast in region is constant, helps to realize the intelligence of illumination.
The invention enables in the region of headlamp uniform irradiation illuminance contrast be no more than with respect to change absolute value
2.6%, the application scenario of applicable varying environment illuminance and illumination region area.
Circuit cost of the present invention is cheap, simple and reliable and capacity usage ratio is high, can be efficiently applied to screen display, image is thrown
The fields such as shadow have actual application value.
Description of the drawings
Fig. 1 is the circuit diagram for realizing adaptive contrast adjustment；
Fig. 2 is each element of apparatus of the present invention physical circuit and its design parameter schematic diagram；
Fig. 3 is the relation curve analogous diagram that lamp current and ambient light illumination are illuminated in circuit；
Fig. 4 is the relation curve analogous diagram that voltage of both ends of lamp and ambient light illumination are illuminated in circuit；
Fig. 5 is relation curve analogous diagram of the houselights according to contrast and ambient light illumination；
Fig. 6 is that headlamp electrical power is bent relative to the ratio i.e. illumination efficiency of circuit general power and the relationship of ambient light illumination
Line analogous diagram.
Specific implementation mode
The invention will be further described with reference to the accompanying drawings and examples.
Apparatus of the present invention realize that the principle of adaptive optical illumination contrast adjustment is：Photoelectric receiving tube is placed on houselights
Shaded side, therefore it is mainly ambient light to be radiated at the light on photoelectric receiving tube.Photoelectric receiving tube reverse bias, therefore photoconduction
The photoelectric current approximation that effect generates is directly proportional to ambient light illumination, final so that shining by the two poles of the earth diode linearly with mutually amplification
Illuminance of the bright lamp in irradiated plane and ambient light illumination at slope be just, zeroaxial linear relationship, illuminance comparison
Degree is basically unchanged.
Present invention specific implementation is as follows：
If the voltage between the base emitter-base bandgap grading of triode Q1 and Q2 is Vbe, gain is β.The VA characteristic curve letter of headlamp
Number is V=f (I).Wherein V is illumination voltage of both ends of lamp, and when I flows through the electric current of headlamp.Headlamp VA characteristic curve
Conducting region has the characteristics that approximate constant voltage, representative instance are photodiode.
The present embodiment calculates the headlamp consumption of electric power P obtained using following formulai0：
Wherein, VCC indicates supply voltage, IoptThe electric current of photoelectric receiving tube, I are flowed through in expressionc2The electricity of headlamp is flowed through in expression
Stream, Ic1Expression flows to the electric current of triode Q1 collectors, Ib1Expression flows to the electric current of triode Q1 base stages, Ib2Expression flows to three
The electric current of pole pipe Q1 base stages, V1 indicate that voltage V1, V2 at resistance R1 and resistance R2 tie points indicate the collector of triode Q1
Voltage, V3 indicate that the collector voltage of triode Q2, R1 indicate the resistance value of resistance R1, and R2, R3, R4, R5 are similarly.
Headlamp consumption of electric power P is obtained by formula (4)i0With opto-electronic receiver tube current IoptRelationship be：
Wherein, bcIndicate IoptI when being zero (i.e. ambient light illumination is zero)c2Value, design is so that it is zero, kcIndicate Ic2
Opposite IoptSlope.Lamp current I must be illuminated by formula (5)c2It is opto-electronic receiver tube current IoptLinear function, and slope is
Just.
If the sensitivity of photoelectric receiving tube is S, unit ampere is per lux.Ambient light illumination is φe, ambient light is entire
Substantially uniform illumination on device, illuminance of the headlamp in irradiated plane are φi, irradiated area A, at photoelectric receiving tube
Illuminance is kiφi(due to being the shaded side of houselights, k at thisiIt is worth very little), luminous efficiency of the headlamp to irradiation area
For η, every watt of unit lumen.Following formula is used to calculate the illumination contrast ε in irradiated plane againa：
Illumination contrast ε is calculated to obtain by formula (5) and (6) jointlyaWith ambient light illumination φeRelationship be：
εa=kbbc/φe+kbkcS,
Wherein
Wherein, kbIt is and η, A and f (Ic2) it is related one simplify expression amount.
The VA characteristic curve of the headlamps such as photodiode has the characteristics that approximate constant voltage in conducting region, and the present invention is by f
(Ic2) it is approximately not with ambient light illumination φeThe fixed value of change, and circuit parameter is set simultaneously and makes kbkcS=1, then illumination
Contrast εaFor one and ambient light illumination φeUnrelated fixed value kbkcS only depends on circuit parameter.By bc=0 is equivalent to：
Setting triode will realize illumination contrast ε in amplification region in the above-mentioned calculating of the present inventionaApproximately constant will expire
Foot：
Wherein, Vce0Be triode collection emitter-base bandgap grading between saturation voltage.
The present invention a specific embodiment be：
Circuit design parameter is as shown in Fig. 2, wherein R1=100k Ω, R2=30k Ω, R3=0.9k Ω, R4=0 Ω, R5
=10k Ω.Triode Q1 and Q2 model is 2N5551.Electric reception pipe uses silicon photoelectric diode SFH213, for standard
Sensitivity S=100nA/lx of light source A.Headlamp is connected using 3 typical white light LEDs, and the single white light LEDs are in voltage
3V-3.6V conducting regions electric current can increase to 150mA from 1mA.If ambient light illumination variation range is 0~1000lx, IoptBecome
Change ranging from 0~100uA.The circuit makes illumination contrast ε in irradiated planeaConsistently equal to 1.
Fig. 3, which is shown, illuminates lamp current I in circuitc2With ambient light illumination φeRelation curve analogous diagram, simulation software is
Multisim 12.0, similarly hereinafter.Curvilinear abscissa is φ in Fig. 3e, longitudinal axis Ic2.Understand Ic2With φeApproximately linear function
Relationship, and slope is just, to tally with the actual situation.
Fig. 4, which is shown, illuminates voltage of both ends of lamp f (I in circuitc2) and ambient light illumination φeRelation curve analogous diagram, can
Know two sections of voltages of headlamp in φeApproximation is kept constant in range 200lx~1000lx.φeWhen within the scope of 0lx~200lx,
Ic2Between 0~26mA, the non-constant non-linear effects to headlamp changed power of voltage are smaller.
As can be seen from figs. 3 and 4 when ambient light is most bright, illumination lamp current Ic2It is up to 116.2mA, at this time headlamp both ends
Voltage f (Ic2) it is 10.76V.The luminous efficiency of typical white LED is 100lm/W, then houselights flux is 116.2mA*
10.76V*100lm/W=125.03lm.Make headlamp at this time in the illuminance of irradiated plane be 1000lx, then irradiates
Area is 0.125m2, the circuit is suitable for desk lamp illumination occasion.
If the white light LEDs luminous efficiency is 100lm/W, irradiated area 0.125m2.Think kiIt is approximately 0, i.e., in photoelectricity
Illumination light in reception pipe is negligible, and Fig. 5 shows illumination contrast εaWith ambient light illumination φeRelation curve emulation
Figure, it is known that the present invention may make that illuminance contrast is no more than with respect to change absolute value in the region of headlamp uniform irradiation
0.52/1/2=2.6%, approximation are kept constant.
Circuit of the present invention relative to general switching regulator manual control lighting lamp circuit merely add a photoelectric receiving tube,
Two triodes and several resistance, therefore have the advantages that of low cost, simple and reliable for structure.
Fig. 6 shows ratio i.e. illumination efficiency η of the headlamp electrical power relative to circuit general poweraWith ambient light illumination φe
Relation curve analogous diagram.Its abscissa is ambient light illumination φe, asterism dotted line expression ηa, respective coordinates axis on the right side of image,
Understand ηaIt is not less than 80% within the scope of ambient light illumination variation 500lx~1000lx.Asterism solid line indication circuit general power Pa,
Respective coordinates axis is on the left of image, it is known that changes within the scope of 0~500lx in ambient light illumination, general power PaIt is relatively low.This makes
Although ambient light illumination changes η within the scope of 0~500lxaRelatively low, what triangle frame solid line indicated removes headlamp with external circuit consumption work(
Rate Ps(there is Ps=Pa(1-ηa)) still relatively low.PsRespective coordinates axis is on the left of image.PsIt totally is kept for no more 0.17W, relatively
In the maximum circuit general power for remaining 1.42W at the ambient light weaker moment, the energy can be effectively saved.Therefore the present invention also has
Have the advantages that capacity usage ratio is high, the fields such as screen display, image projecting can be efficiently applied to, there is actual application value.
Above-mentioned specific implementation mode is used for illustrating the present invention, rather than limits the invention, the present invention's
In spirit and scope of the claims, to any modifications and changes that the present invention makes, the protection model of the present invention is both fallen within
It encloses.
Claims (9)
1. a kind of automatically keeping the constant lighting lamp device of illumination contrast, it is characterised in that：Including adaptive lighting circuit and
Adaptive light structures, adaptive lighting circuit include photoelectric receiving tube D1, resistance R1, R2, R3, R4 and R5, triode Q1, Q2
With headlamp D2；The one end resistance R1 connects supply voltage VCC, the resistance R1 other ends respectively with photoelectric receiving tube D1, resistance R2
One end is connected, and triode Q1 base stages are connected with the other end of resistance R2, the other end ground connection of photoelectric receiving tube D1, triode Q1's
Collector is connected with one end of resistance R3, resistance R5, and the emitter-base bandgap grading of triode Q1 is connected through resistance R4 to be grounded, the other end of resistance R3
Supply voltage VCC is connected, the base stage of triode Q2 is connected with the other end of resistance R5, and the collector of triode Q2 is through headlamp D2
It is connect with supply voltage VCC, the emitter grounding of triode Q2.
2. a kind of the constant lighting lamp device of illumination contrast is automatically kept according to claim 1, it is characterised in that：Institute
The adaptive light structures stated include：Photoelectric receiving tube D1 is placed on the shaded side of headlamp D2.
3. a kind of the constant lighting lamp device of illumination contrast is automatically kept according to claim 1, it is characterised in that：Institute
The photoelectric receiving tube D1 reverse bias stated is arranged between supply voltage VCC and ground, the negative pole end connection electricity of photoelectric receiving tube D1
Hinder R1, the positive terminal ground connection of photoelectric receiving tube D1.
4. a kind of the constant lighting lamp device of illumination contrast is automatically kept according to claim 1, it is characterised in that：Institute
The collector of the triode Q2 stated is connect with the negative pole end of headlamp D2, the positive terminal connection supply voltage VCC of headlamp D2.
5. a kind of the constant lighting lamp device of illumination contrast is automatically kept according to claim 1, it is characterised in that：Institute
The headlamp D2 stated is to convert electrical energy into luminous energy and VA characteristic curve has the characteristics that the device of class constant pressure, including but not limited to
Light emitting diode, LED light etc..
6. a kind of the constant lighting lamp device of illumination contrast is automatically kept according to claim 1, it is characterised in that：Institute
The photoelectric receiving tube D1 stated is the device converted light into as electric current, including but not limited to photodiode, phototriode etc..
7. a kind of the constant lighting lamp device of illumination contrast is automatically kept according to claim 1, it is characterised in that：Institute
The supply voltage VCC stated is DC constant voltage power supply.
8. a kind of the constant lighting lamp device of illumination contrast is automatically kept according to claim 1, it is characterised in that：Institute
The triode Q1 stated and Q2 is NPN type triode.
9. a kind of the constant lighting lamp device of illumination contrast is automatically kept according to claim 1, it is characterised in that：Institute
The device of the photoelectric receiving tube D1 stated, resistance R1, R2, R3, R4 and R5, triode Q1, Q2 and headlamp D2 use following formula
It is configured, realizes illumination contrast adaptive constant：
Ambient light illumination φeIn 0~φe,maxBetween change, keep the illumination contrast ε of irradiated planea=φe/φiPerseverance is solid
Definite value εa0, φiIndicate the illuminance of irradiated plane, illumination voltage of both ends of lamp constant pressure value Vc2Meet：
VCC-Vc2≥Vce0 (1)
Wherein, VCC is supply voltage, Vce0The saturation voltage between the collection emitter-base bandgap grading of single triode, η indicate headlamp to irradiated region
The luminous efficiency in domain, R3 and R5 indicate the resistance value of resistance R3 and R5 respectively；
Also, the resistance value R3 and R5 of resistance R3 and R5 meet：
VCC-Vbe-φe,maxεa0A/(ηVc2) (R3+R5)/β=0 (2)
Wherein, φa0Indicate the illuminance φ of irradiated planeaSteady state value, β be single triode current DC gain, VbeFor
The base of single triode penetrates voltage across poles, and A indicates irradiated area；
Also, the resistance value R1 and R2 of R4=0, resistance R1 and R2 meet：
Wherein, R1 and R2 indicates the resistance value of resistance R1 and R2, φ respectivelye,maxIndicate that the maximum value of ambient light illumination, S indicate photoelectricity
Reception pipe D1 sensitivity, unit ampere is per lux.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810374752.2A CN108738196A (en) | 2018-04-24 | 2018-04-24 | Automatically keep the constant lighting lamp device of illumination contrast |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810374752.2A CN108738196A (en) | 2018-04-24 | 2018-04-24 | Automatically keep the constant lighting lamp device of illumination contrast |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014125579A1 (en) * | 2013-02-13 | 2014-08-21 | 新電元工業株式会社 | Led illumination dimming circuit and led illumination dimming method |
| CN204359433U (en) * | 2014-12-18 | 2015-05-27 | 薛百含 | A kind of illuminance testing circuit |
| CN204968174U (en) * | 2015-08-24 | 2016-01-13 | 周云侠 | Optically -controlled LED illuminating lamp |
| CN105979663A (en) * | 2016-07-18 | 2016-09-28 | 黄宇嵩 | LED street lamp auto-adaptive to change of ambient brightness |
-
2018
- 2018-04-24 CN CN201810374752.2A patent/CN108738196A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014125579A1 (en) * | 2013-02-13 | 2014-08-21 | 新電元工業株式会社 | Led illumination dimming circuit and led illumination dimming method |
| CN204359433U (en) * | 2014-12-18 | 2015-05-27 | 薛百含 | A kind of illuminance testing circuit |
| CN204968174U (en) * | 2015-08-24 | 2016-01-13 | 周云侠 | Optically -controlled LED illuminating lamp |
| CN105979663A (en) * | 2016-07-18 | 2016-09-28 | 黄宇嵩 | LED street lamp auto-adaptive to change of ambient brightness |
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