CN108848591A - Automatically keep the constant lighting lamp device of illuminance - Google Patents
Automatically keep the constant lighting lamp device of illuminance Download PDFInfo
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- CN108848591A CN108848591A CN201810373998.8A CN201810373998A CN108848591A CN 108848591 A CN108848591 A CN 108848591A CN 201810373998 A CN201810373998 A CN 201810373998A CN 108848591 A CN108848591 A CN 108848591A
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- receiving tube
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- 238000005286 illumination Methods 0.000 claims abstract description 57
- 230000003044 adaptive effect Effects 0.000 claims description 16
- 230000005611 electricity Effects 0.000 claims description 4
- 230000035945 sensitivity Effects 0.000 claims description 4
- 208000003464 asthenopia Diseases 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 10
- 230000005693 optoelectronics Effects 0.000 description 4
- 230000009021 linear effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000005622 photoelectricity Effects 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 210000005252 bulbus oculi Anatomy 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000012886 linear function Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009022 nonlinear effect Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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]
- H05B45/10—Controlling the intensity of the light
-
- 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
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/10—Controlling the light source
- H05B47/105—Controlling the light source in response to determined parameters
- H05B47/11—Controlling the light source in response to determined parameters by determining the brightness or colour temperature of ambient light
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The constant lighting lamp device of illuminance is automatically kept the invention discloses a kind of.Photoelectric receiving tube D1 connection supply voltage VCC, photoelectric receiving tube D1 is connected with resistance R1, resistance R2 respectively, triode Q1 base stage is connected with resistance R2, resistance R1 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 voltage 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 with respect to change absolute value less than 2.75%；The application of applicable varying environment illuminance and illumination region area；Circuit cost is cheap, simple and reliable and capacity usage ratio is high, can effectively save lighting energy, mitigates eye fatigue, has practical application value.
Description
Technical field
The present invention relates to energy-saving illumination fields, fill more particularly, to a kind of constant headlamp of illuminance that automatically keeps
It sets.
Background technique
At present for most headlamps, control mode is manual control or timing controlled.Both control modes
Simply, but there are obvious shortcomings：The intensity of illumination that headlamp cannot be automatically adjusted according to external environmental light power, to cause
Waste of energy or illuminance deficiency in certain time.
Illumination is the importance of mankind's energy consumption, at present in the consumption of electric power, European and American developed countries' electric consumption on lighting
The ratio for accounting for power generation total amount is about 20%, and China also reaches 12%, this ratio will step up every year.With society
It continues to develop, demand of the mankind to the energy is increasing, and current energy crisis aggravates, so that all trades and professions have to take into account that section
Can, low-power consumption has become the key index for measuring every technology.Therefore reasonable, the reliable and stable adaptive photograph of development cost
The lighting engineering that degree is adjusted has important practical significance.
The manual control and timing controlled that existing headlamp uses, have a series of disadvantage, can not be carried out according to environment
Adjust in real time etc., not smart enoughization.
Summary of the invention
For at present for majority of illumination lamp, using manual control or timing controlled cannot adaptive illumination adjust
Status automatically keeps the constant lighting lamp device of illuminance the invention proposes a kind of.
Specific technical solution of the present invention is as follows：
One, a kind of to automatically keep the constant lighting lamp device of illuminance：
Device includes adaptive lighting circuit and adaptive light structures, and adaptive lighting circuit includes photoelectric receiving tube
D1, resistance R1, R2, R3, R4 and R5, triode Q1, Q2 and headlamp D2；The one end photoelectric receiving tube D1 connects supply voltage
VCC, photoelectric receiving tube the D1 other end are connected with one end of resistance R1, resistance R2 respectively, and triode Q1 base stage is another with resistance R2's
One end is connected, and the other end ground connection of resistance R1, the collector of triode Q1 is connected with one end of resistance R3, resistance R5, triode
The emitter-base bandgap grading of Q1 is connected through resistance R4 to be grounded, and the other end of resistance R3 connects supply voltage VCC, the base stage and resistance of triode Q2
The other end of R5 is connected, and the collector of triode Q2 is connect through headlamp D2 with supply voltage VCC, and the emitter-base bandgap grading of triode Q2 connects
Ground.
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, environment light
Houselights illumination weakens when illumination enhances, and houselights illumination enhances when ambient light illumination weakens, to keep whole light
The illuminance of (the sum of houselights and environment light) is constant, realizes and automatically keeps the constant effect of illuminance.
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
Extreme connection supply voltage VCC, the positive terminal of photoelectric receiving tube D1 are connected with one end of resistance R1, resistance R2 respectively.
The collector of the triode Q2 is connect with the negative pole end of headlamp D2, and the positive terminal of headlamp D2 connects electricity
Source 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,
Including but 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 illuminance adaptive constant：
Since headlamp VA characteristic curve has the characteristics that approximate constant voltage, illumination voltage of both ends of lamp are approximate in conducting region
Take device constant pressure value Vc2。
Ambient light illumination φeIn 0~φe,maxBetween change, keep the illuminance φ of irradiated planeaPerseverance is fixed value
φa0, illuminate voltage of both ends of lamp constant pressure value Vc2Meet：
VCC-Vc2≥Vce0 (0)
Wherein, VCC is supply voltage, Vce0The saturation voltage between the collection emitter-base bandgap grading of single triode, three poles in specific implementation
The model of pipe Q1 and Q2 is identical, and η indicates luminous efficiency of the headlamp to irradiation area, every watt of unit lumen, and A indicates shadow surface
Product, R3 and R5 respectively indicate the resistance value of resistance R3 and R5；
Also, the resistance value R3 and R5 of resistance R3 and R5 meet：
VCC-Vbe-φa0A/(ηVc2) (R3+R5)/β=0 (0)
Wherein, φa0Indicate the illuminance φ of irradiated planeaSteady state value, β be single triode current DC gain,
VbeBase for single triode penetrates voltage across poles；
Also, the resistance value R1 and R2 of R4=0, resistance R1 and R2 meet：
VCC-Vbe-(R1+R2)(VCC-Vbe)/R3=R1S φa0 (0)
Wherein, R1 and R2 respectively indicates the resistance value of resistance R1 and R2, and S indicates photoelectric receiving tube D1 sensitivity, unit ampere
Every 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 adaptive illumination is adjusted, and improves the illumination of illumination region
It is constant, help to realize the intelligence of illumination.
The present invention may make that illuminance is no more than with respect to change absolute value in the region of headlamp uniform irradiation
2.75%, the application 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 effectively save lighting energy, mitigates eye
Eyeball fatigue, has practical application value.
Detailed description of the invention
Fig. 1 is the circuit diagram realizing adaptive illumination and adjusting；
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 the relation curve analogous diagram of headlamp irradiated plane global illumination degree and ambient light illumination；
Fig. 6 is headlamp electrical power relative to the ratio i.e. illumination efficiency of circuit general power and the relation curve of ambient light illumination
Analogous diagram.
In Fig. 1：Supply voltage VCC flows through the electric current I of photoelectric receiving tubeopt, by positive pole flow to resistance R1 and
R2.Flow through the electric current I of headlampc2, triode Q2 collector is flowed to by positive pole.Flow to the electricity of triode Q1 collector
Flow Ic1.Flow to the electric current I of triode Q1 base stageb1.Flow to the electric current I of triode Q1 base stageb2.At resistance R1 and R2 tie point
Voltage V1.The collector voltage V2 of triode Q1.The collector voltage V3 of triode Q2.
Specific embodiment
Present invention will be further explained below with reference to the attached drawings and examples.
Apparatus of the present invention can be realized the principle that adaptive illumination is adjusted：Photoelectric receiving tube is placed on houselights
Shaded side, therefore being radiated at the light on photoelectric receiving tube is mainly environment light.Photoelectric receiving tube reverse bias, therefore photoconduction
The photoelectric current approximation that effect generates is directly proportional to ambient light illumination, amplifies by the linear reverse phase of the two poles of the earth diode, finally to shine
The linear relationship that illuminance and ambient light illumination of the bright lamp in irradiated plane are -1 at slope, thus what sum of the two was constituted
Global illumination degree is basically unchanged.
Present invention specific implementation is as follows：
Identical voltage between the base emitter-base bandgap grading of triode Q1 and triode Q2 is Vbe, identical gain is β.Headlamp
VA characteristic curve function 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 volt
Peace characteristic curve has the characteristics that approximate constant voltage, representative instance are photodiode in conducting region.
The present embodiment is calculated using the following equation the headlamp consumption of electric power P of acquisitioni0：
Wherein, VCC indicates supply voltage, IoptThe electric current of photoelectric receiving tube, I are flowed through in expressionc2Headlamp is flowed through in expression
Electric current, Ic1Expression flows to the electric current of triode Q1 collector, Ib1Expression flows to the electric current of triode Q1 base stage, Ib2Indicate flow direction
The electric current of triode Q1 base stage, V1 indicate that the voltage at resistance R1 and resistance R2 tie point, V2 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, kcIndicate Ic2Opposite IoptSlope it is exhausted
To value.Lamp current I is illuminated known to formula (5)c2It is opto-electronic receiver tube current IoptLinear function, and slope is negative.
If the sensitivity of photoelectric receiving tube is S, the every lux of unit ampere.Ambient light illumination is φe, environment light is whole
Substantially uniform illumination on a device, illuminance of the headlamp in irradiated plane are φi, irradiated area A, photoelectric receiving tube
The illuminance at place is kiφi, (due to being the shaded side of houselights, k at thisiIt is worth very little), hair of the headlamp to irradiation area
Light efficiency is η, every watt of unit lumen.The global illumination degree φ being calculated using the following equation in irradiated plane againa：
Wherein, kiIndicate illuminance proportionality coefficient.
The global illumination degree φ in irradiated plane is calculatedaWith ambient light illumination φeRelationship be：
φa=kbbc+(1-kbkcS)φe,
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 according to
Penetrate the global illumination degree φ in planeaFor one and ambient light illumination φeUnrelated fixed value, depends on circuit parameter.
Triode is set in above-mentioned calculating of the invention in amplification region, then to realize global illumination degree φaApproximately constant,
It also needs that triode is avoided to enter by area or saturation region, that is, meets：
Wherein, Vce0Be triode collection emitter-base bandgap grading between saturation voltage.
A specific embodiment of the invention is：
Circuit design parameter is as shown in Fig. 2, wherein R1=330k Ω, R2=10k 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 using 3 typical white light LEDs series connection, and the single white light LEDs are in voltage
For 3V-3.6V conducting region electric current 150mA can be increased to from 1mA.If ambient light illumination variation range is 0~1000lx, Iopt
Variation range is 0~100uA.The circuit makes whole light (irradiation the sum of light and environment light) illumination in irradiated plane begin
It is equal to 1000lx eventually.
Fig. 3 shows illumination lamp current I in circuitc2With ambient light illumination φeRelation curve analogous diagram, simulation software
For Multisim 12.0, similarly hereinafter.Curvilinear abscissa is φ in Fig. 3e, longitudinal axis Ic2.Know Ic2With φeApproximately linear letter
Number relationship, and slope is negative, and tallies with the actual situation.
Fig. 4 shows illumination 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 0~900lx of range.φeWhen within the scope of 900lx~1000lx,
Ic2Between 0~13mA, voltage is non-constant smaller to the non-linear effects of headlamp changed power.
As can be seen from figs. 3 and 4 when environment light, i.e. opto-electronic receiver tube current I is not presentoptIt is zero (SFH213 reverse biased
Typical case's dark current 0.4nA when 12V can be ignored) when, illuminate lamp current Ic2It is up to 128mA, illuminates voltage of both ends of lamp f at this time
(Ic2) it is 10.8V.The luminous efficiency of typical white LED is 100lm/W, then houselights flux is 128mA*10.8V*
100lm/W=138.24lm.Headlamp at this time is made in the illuminance of irradiated plane to be 1000lx, then irradiated area is
0.138m2, the circuit is suitable for desk lamp illumination occasion.
If the white light LEDs luminous efficiency is 100lm/W, irradiated area 0.138m2.Think kiIt is approximately 0, i.e., in photoelectricity
Illumination light in reception pipe is negligible, and Fig. 5 shows irradiated plane global illumination degree φiWith ambient light illumination φePass
It is curve analogous diagram, it is known that the circuit design makes the opposite change absolute value of illuminance in the region of headlamp uniform irradiation
No more than 55lx/1000lx/2=2.75%, approximation is kept constant.
Circuit of the present invention merely adds an opto-electronic receiver relative to general switching regulator manual control lighting lamp circuit
Pipe, two triodes and several resistance, therefore have the advantages that low in 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
φeRelation curve analogous diagram.Its abscissa is ambient light illumination φe, asterism dotted line expression ηa, respective coordinates axis is on the image right side
Side, it is known that ηaChange in ambient light illumination and is not less than 80% within the scope of 0~500lx.Asterism solid line indication circuit general power Pa, right
Answer reference axis on the left of image, it is known that change within the scope of 500~1000lx in ambient light illumination, general power PaIt is lower.This makes
Although ambient light illumination changes η within the scope of 500~1000lxaLower, the headlamp that removes of triangle frame solid line expression is disappeared with external circuit
Consume power Ps(there is Ps=Pa(1-ηa)) still lower.PsRespective coordinates axis is on the left of image.PsIt totally is kept for no more 0.15W,
Remain that the maximum circuit general power of 1.38W can effectively save the energy at the environment light stronger moment relative to manual control.Cause
This present invention also has the advantages that capacity usage ratio is high, can effectively save lighting energy, has practical application value.
Above-mentioned specific embodiment is used to illustrate the present invention, rather than limits the invention, of the invention
In spirit and scope of protection of the claims, to any modifications and changes that the present invention makes, protection model of the invention is both fallen within
It encloses.
Claims (9)
1. a kind of automatically keep the constant lighting lamp device of illuminance, it is characterised in that：Including adaptive lighting circuit and adaptive
Answer light structures, adaptive lighting circuit includes photoelectric receiving tube D1, resistance R1, R2, R3, R4 and R5, triode Q1, Q2 and photograph
Bright lamp D2；The one end photoelectric receiving tube D1 connect supply voltage VCC, the photoelectric receiving tube D1 other end respectively with resistance R1, resistance R2
One end be connected, triode Q1 base stage is connected with the other end of resistance R2, and the other end of resistance R1 is grounded, the current collection of triode Q1
Pole 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 connection of resistance R3
The base stage of supply voltage VCC, triode Q2 are connected with the other end of resistance R5, and the collector of triode Q2 is through headlamp D2 and electricity
Source voltage VCC connection, the emitter grounding of triode Q2.
2. a kind of the constant lighting lamp device of illuminance is automatically kept according to claim 1, it is characterised in that：Described
Adaptively light structures include：Photoelectric receiving tube D1 is placed on the shaded side of headlamp D2.
3. a kind of the constant lighting lamp device of illuminance is automatically kept according to claim 1, it is characterised in that：Described
Photoelectric receiving tube D1 reverse bias is arranged between supply voltage VCC and ground, the negative pole end connection power supply electricity of photoelectric receiving tube D1
VCC is pressed, the positive terminal of photoelectric receiving tube D1 is connected with one end of resistance R1, resistance R2 respectively.
4. a kind of the constant lighting lamp device of illuminance is automatically kept according to claim 1, it is characterised in that：Described
The collector of triode Q2 is connect with the negative pole end of headlamp D2, and the positive terminal of headlamp D2 connects supply voltage VCC.
5. a kind of the constant lighting lamp device of illuminance is automatically kept according to claim 1, it is characterised in that：Described
Headlamp D2 is to convert electrical energy into luminous energy and VA characteristic curve has the characteristics that the device of class constant pressure, is including but not limited to shone
Diode, LED light etc..
6. a kind of the constant lighting lamp device of illuminance is automatically kept according to claim 1, it is characterised in that：Described
Photoelectric receiving tube D1 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 illuminance is automatically kept according to claim 1, it is characterised in that：Described
Supply voltage VCC is DC constant voltage power supply.
8. a kind of the constant lighting lamp device of illuminance is automatically kept according to claim 1, it is characterised in that：Described
Triode Q1 and Q2 is NPN type triode.
9. a kind of the constant lighting lamp device of illuminance is automatically kept according to claim 1, it is characterised in that：Described
The device of photoelectric receiving tube D1, resistance R1, R2, R3, R4 and R5, triode Q1, Q2 and headlamp D2 are carried out using following formula
Illuminance adaptive constant is realized in setting：
Ambient light illumination φeIn 0~φe,maxBetween change, keep the illuminance φ of irradiated planeaPerseverance is fixed value φa0, illumination
Voltage of both ends of lamp constant pressure value Vc2Meet：
VCC-Vc2≥Vce0 (0)
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, A indicate that irradiated area, R3 and R5 respectively indicate the resistance value of resistance R3 and R5；
Also, the resistance value R3 and R5 of resistance R3 and R5 meet：
VCC-Vbe-φa0A/(ηVc2) (R3+R5)/β=0 (0)
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；
Also, the resistance value R1 and R2 of R4=0, resistance R1 and R2 meet：
VCC-Vbe-(R1+R2)(VCC-Vbe)/R3=R1S φa0 (0)
Wherein, R1 and R2 respectively indicates the resistance value of resistance R1 and R2, and S indicates photoelectric receiving tube D1 sensitivity, the every Le of unit ampere
Ke Si.
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| CN201810373998.8A CN108848591B (en) | 2018-04-24 | 2018-04-24 | Lighting lamp device capable of automatically keeping illuminance constant |
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