CN106793245B - Light-operated LED car headlight control device - Google Patents
Light-operated LED car headlight control device Download PDFInfo
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- CN106793245B CN106793245B CN201611028908.9A CN201611028908A CN106793245B CN 106793245 B CN106793245 B CN 106793245B CN 201611028908 A CN201611028908 A CN 201611028908A CN 106793245 B CN106793245 B CN 106793245B
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- 230000005611 electricity Effects 0.000 claims description 5
- 210000001367 artery Anatomy 0.000 claims description 2
- 210000003462 vein Anatomy 0.000 claims description 2
- 238000005286 illumination Methods 0.000 abstract description 12
- 230000003760 hair shine Effects 0.000 abstract description 2
- 230000008859 change Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 241001465382 Physalis alkekengi Species 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000003550 marker Substances 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
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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]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
-
- 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
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- Circuit Arrangement For Electric Light Sources In General (AREA)
- Lighting Device Outwards From Vehicle And Optical Signal (AREA)
Abstract
The light-operated LED car headlight control device of the present invention, including regulator circuit, pulse signal circuit and constant-current drive circuit, regulator circuit input terminal connects direct voltage source, circuit output end of pressure-stabilizing connects pulse signal generating circuit input terminal, pulse signal generating circuit output end connects constant-current drive circuit signal input part, and constant-current drive circuit output end connects headlight for vehicles.The device controls headlight for vehicles luminous intensity and shines by force with environment illumination intensity adjust automatically, is conducive to energy saving.The device is slightly transformed, is also applicable in other illumination places and is with a wide range of applications such as road, plaza lighting.
Description
Technical field
The present invention relates to illumination, electronic technology, electric apparatus control apparatus, specifically a kind of to change with environment illumination intensity
The light-operated LED car headlight control device of adjust automatically luminous intensity.
Background technology
With the maturation of LED technology, LED illumination lamp replaces traditional lighting lamps and lanterns to be trend of the times, LED illumination lamp
It is also such that tool, which is used as automobile lamp,.Early period, LED lamp are used merely as automobile lampet, if European legislation provides, in order to travel peace
Entirely, all vehicles on sale must all assemble LED side-marker lamps.In recent years, full vehicle used LED lamp as photograph including headlight
The vehicle of bright lamp tool is more and more, including the famous vehicle such as benz, Audi.
Headlight (including high beam and dipped headlight) on existing automobile is all to open and close manually, and luminous intensity can not
It adjusts, this is because the automatic light-control technology difficulty of conventional lamp is larger.The characteristic of LED DC low-voltages work is easier to realize control
Luminous intensity.
The characteristics of light-operated LED headlight for vehicles is that the light emission luminance of headlight for vehicles is regulated and controled by ambient light, when ambient lighting is strong, lamp
It does not work；When ambient lighting is weak, lamp is lighted automatically, also, luminous intensity is converted with environment illumination intensity, and the weaker lamp of ambient lighting is more
It is bright.Its advantage：1. automatic illumination does not have to driver's hand control switch；2. night is larger in urban district major trunk roads or flow of personnel
When site surrounding illumination is stronger, luminous intensity is reduced automatically, reduces light pollution of the car light to urban district；3. being reduced automatically when meeting remote
Light lamplight brightness is conducive to driving safety.
Invention content
To solve the above-mentioned problems, the present invention provides a kind of light-operated LED car headlight control devices, control light-operated LED
The luminous intensity of headlight for vehicles shines by force with environment illumination intensity adjust automatically, is conducive to energy saving.
The present invention uses following technical scheme：
Light-operated LED car headlight control device, which is characterized in that driven including regulator circuit, pulse signal circuit and constant current
Dynamic circuit, regulator circuit input terminal connect direct voltage source, and circuit output end of pressure-stabilizing connects pulse signal generating circuit input terminal,
Pulse signal generating circuit output end connects constant-current drive circuit signal input part, and it is big that constant-current drive circuit output end connects automobile
Lamp.
Further, the regulator circuit includes resistance R1, and resistance R1 mono- terminates direct voltage source, the resistance R1 other ends
Pulse signal generating circuit input terminal, the one end resistance R2, the poles voltage stabilizing chip K are connect respectively, and the resistance R2 other ends are separately connected voltage stabilizing
The poles chip R and the one end resistance R3, resistance R3 other ends ground connection, the poles the A ground connection of voltage stabilizing chip.
Further, the voltage stabilizing chip is TL431 chips.
Further, the pulse signal generating circuit includes triode VT1, and triode VT1 emitters are separately connected
The 4th pin of base chip, the resistance R5 other ends when the 8th pin of base chip, RC when circuit output end of pressure-stabilizing, the one end resistance R5, RC
It is separately connected triode VT1 base stages, triode VT2 collectors, base chip third pin, three poles when triode VT2 base stages meet RC
Pipe VT2 emitters are grounded by resistance R6, and triode VT1 collectors connect photosensitive sensor one end, light sensor by resistance R4
Device mono- fixing end of another termination slide rheostat RP, base when another fixing end of slide rheostat RP meets RC by resistance R7
7th pin of chip, base when the 6th pin of base chip, the RC when mobile terminal of slide rheostat RP meets the one end capacitance C1, RC respectively
Chip second pin, capacitance C1 other ends ground connection, base the first pin of chip is grounded when RC, and the 5th pin of base chip passes through electricity when RC
Hold C2 ground connection, base chip third pin connects the signal input part of constant-current drive circuit when RC.
Further, photosensitive sensor is the linear photosensor sensor of model LXD/GB3.
Further, base chip is IC7555 chips when the RC.
Further, the constant-current drive circuit includes constant-current driven chip U1, the first pins of constant-current driven chip U1
Triode VT11 emitters, the one end resistance R11, resistance R11 other ends ground connection are connect respectively, and triode VT11 collectors connect two respectively
Pole pipe D11 anodes, the one end inductance L11, the inductance L11 other ends meet direct voltage source, the one end capacitance C11, capacitance C14 mono- respectively
End, LED combination light source cathode, capacitance C11 other ends ground connection, the capacitance C14 other ends meet diode D11 cathode, resistance R13 respectively
One end, constant-current driven chip U1 thirds pin, the one end resistance R14, the resistance R13 other ends connect LED combination light source anode, perseverance respectively
The 4th pins of driving chip U1 are flowed, the resistance R14 other ends distinguish the one end connecting resistance R15, the 7th pins of constant-current driven chip U1, electricity
R15 other ends ground connection is hindered, constant-current driven chip U1 second pins are grounded by capacitance C12, the 5th pins of constant-current driven chip U1
It is grounded by capacitance C13, the 9th pins of constant-current driven chip U1 ground connection, the 6th pins of constant-current driven chip U1 pass through resistance R12
Connect the signal output end of pulse signal generating circuit.
Further, the model MT7285 of the constant-current driven chip U1.
Further, the LED combination light source includes several concatenated white led lamps.
The beneficial effects of the invention are as follows：
1, constant-current drive circuit is using MT7285 constant-current driven chips and external MOS transistor drive circuits and white light LEDs
Combined light source forms a efficient, energy-saving LED lamps and lanterns for direct current supply.The MT7285 chip input voltage ranges are wide
(2.5V-40V) can simulate light modulation by its ADJ pin and PWM is dimmed.
2, pulse-generating circuit generates the pulse electrical signal frequency of output in this programme and pulse width is emphasized by ambient light
System, the signal are applied directly to the ADJ pins of MT7285, realize PWM dimming functions.The device selection of induced environment intensity of illumination can
Light-exposed linear transducer LXD/GB3-A1DPS, the variation of the device equivalent internal resistance directly reflect the variation of environmental light intensity.
3, for the pwm signal for making output stablize, pulse signal generates the supply voltage of part, via TL431 compositions
It is supplied after regulator circuit voltage stabilizing, it can be general for 12V gasoline automobiles and 24V diesel cars.
Description of the drawings
Fig. 1 is circuit principle structure figure of the present invention.
Specific implementation mode
Light-operated LED car headlight control device as shown in Figure 1, including regulator circuit, pulse signal circuit and constant current are driven
Dynamic circuit, regulator circuit input terminal connect direct voltage source, and circuit output end of pressure-stabilizing connects pulse signal generating circuit input terminal,
Pulse signal generating circuit output end connects constant-current drive circuit signal input part, and it is big that constant-current drive circuit output end connects automobile
Lamp.
Regulator circuit includes resistance R1, and resistance R1 mono- terminates direct voltage source, and the resistance R1 other ends connect pulse signal respectively
Generation circuit input terminal, the one end resistance R2, the poles voltage stabilizing chip K, the resistance R2 other ends are separately connected the poles voltage stabilizing chip R and resistance R3
One end, resistance R3 other ends ground connection, the poles the A ground connection of voltage stabilizing chip.Wherein, the voltage stabilizing chip is TL431 chips.
The operation principle of regulator circuit is：
Automobile storage battery voltage is variation in use, and especially in start-up course, 12V battery voltage can be reduced to 9V
Below.The voltage of this variation is added to the regulator circuit being made of TL431 and R1, R2, R3.TL431 is a kind of parallel voltage-stabilizing collection
At circuit.Because its performance is good, price is low, it is widely used in various power circuits.It allows maximum input voltage to be 37V,
Maximum operating currenbt 150mA, internal reference voltage 2.5V, output voltage range 2.5V-30V.Voltage stabilizing output voltage size by
The ratio determination of R2 and R3, output voltage U=2.5 (1+R2/R3) V.When selecting R2=R3,5V stable DCs are exported
Pressure.The pulse signal generating circuit that the load of the circuit is made of low-power consumption IC7555 etc..
Pulse signal generating circuit includes triode VT1, triode VT1 emitters be separately connected circuit output end of pressure-stabilizing,
The 4th pin of base chip, the resistance R5 other ends are separately connected triode when the 8th pin of base chip, RC when the one end resistance R5, RC
VT1 base stages, triode VT2 collectors, base chip third pin when triode VT2 base stages meet RC, triode VT2 emitters pass through
Resistance R6 ground connection, triode VT1 collectors connect photosensitive sensor one end by resistance R4, and another termination sliding of photosensitive sensor becomes
Resistance device mono- fixing end of RP, the 7th pin of base chip when another fixing end of slide rheostat RP meets RC by resistance R7,
Base chip second pin when the 6th pin of base chip, the RC when mobile terminal of slide rheostat RP meets the one end capacitance C1, RC respectively, electricity
Hold C1 other ends ground connection, base the first pin of chip is grounded when RC, and the 5th pin of base chip is grounded by capacitance C2 when RC, base when RC
Chip third pin connects the signal input part of constant-current drive circuit.Wherein, photosensitive sensor is the linear light of model LXD/GB3
Dependent sensor, base chip is IC7555 chips when the RC.
The principle of pulse signal generating circuit is as follows：
One astable multivibrator is formed by IC7555, VT1, VT2, R4, LXD, RP, R7 and C1.IC7555 is to adopt
The RC time base circuits manufactured with CMOS technology, with low-loss, extremely low port input current, wide power voltage range (2V-
18V), the features such as working frequency is high, stability is good, has all surmounted common 555 time base circuit on many important performances.
LXD is visible-light linear sensor.The charge and discharge circuit of capacitance C1 is：During t1, power supply by VT1, R4,
LXD and RPA charges to capacitance C1；During t2, C1 is discharged by 7 feet of RPB, R7 and 7555.It should be noted that：(1) exist
C1 is charged to before 2/3 threshold level, and high level is presented in 3 feet of IC7555, i.e.,：During t1, VT1 conductings, VT2 saturation conductions,
The internal resistance r of very little is presented in VT2VT2.(2) 7,555 2 foot of triggering end (set end) and threshold level end (reset terminal) 6 foot directly in
C1 simultaneously connects, and after circuit start, first threshold voltage when charging on capacitance is 1/3*V2, and charging termination value is 2/3*V2.
Charging time t1=0.693 (rVT1+R4+RLXD+ RPA) C1, discharge time t2=0.693 (RPB+R7) C1, in formula：
rVT1Equivalent internal resistance when being connected for VT1, resistance value very little when VT1 is connected.RLXDFor the equivalent internal resistance under photo resistance ambient lighting,
Change with intensity of illumination.
It can be seen that by t1 formula, rVT1Variation makes t1 change, i.e. pulse width variation.T=t1+t2=0.693 (rVT1+R4+
RLXD+ RP+R7) C1, it can be seen that from formula, cycle T is also modulated by ambient lighting.
Determine that initial pulse width, the variation of environmental light intensity make the equivalent internal resistance R of LXD by adjusting RPLXDChange, realizes
The change of output pulse width.
The 3 foot output pwm signals that pulse signal producer passes through IC7555.
It should be noted that：(1) selection of R4, RP.It, be just in order to adapt to different light environments and obtain linearity light adjusting
Really selection charge circuit and the concatenated resistance values of LXD (i.e. R4, RP).Figure below is the visible light sensor LXD/GB3- that producer provides
When A1DPS is powered after connecting from different valued resistors using 5V DC power supplies, illumination-voltage curve.(2)LXD/GB3-A1DPS
Rated voltage be 12V, illumination-voltage curve can also be changed by changing its input voltage.
Constant-current drive circuit includes constant-current driven chip U1, and the first pins of constant-current driven chip U1 meet triode VT11 respectively
Emitter, the one end resistance R11, resistance R11 other ends ground connection, triode VT11 collectors connect diode D11 anodes, inductance respectively
The one end L11, it is negative that the inductance L11 other ends connect direct voltage source, the one end capacitance C11, the one end capacitance C14, LED combination light source respectively
Pole, capacitance C11 other ends ground connection, the capacitance C14 other ends connect diode D11 cathode, the one end resistance R13, constant current driving core respectively
Piece U1 thirds pin, the one end resistance R14, the resistance R13 other ends meet LED combination light source anode, constant-current driven chip U1 the respectively
Four pins, the resistance R14 other ends distinguish the one end connecting resistance R15, the 7th pins of constant-current driven chip U1, another terminations of resistance R15
Ground, constant-current driven chip U1 second pins are grounded by capacitance C12, and the 5th pins of constant-current driven chip U1 are connect by capacitance C13
Ground, the 9th pins of constant-current driven chip U1 ground connection, the 6th pins of constant-current driven chip U1 connect pulse signal by resistance R12 and generate
The signal output end of circuit.Wherein, the model MT7285 of the constant-current driven chip U1.
The operation principle of constant-current drive circuit is：
MT7285 integrated circuits are as constant-current driven chip, the output of external MOS triodes VT11 extended powers, high brightness
LED makees the elements such as light source composition constant-current drive circuit.Maximum drive 40WLED light sources.
The pwm signal of pulse signal generating circuit output is added to 6 feet of constant current drive integrated circult TM7825 through resistance R12
(ADJ feet).ADJ feet are brightness and ON/OFF controlling switch, support simulation light modulation and PWM light modulations.When being dimmed with PWM, fit
It is the square-wave signal of 100Hz to 10kHz to answer frequency, it is desirable that signal amplitude is more than 1.6V.LED current is with pwm signal duty
The change of ratio changes between 5% -100%.
It should be further noted that：MT7285 chip interiors include overvoltage protection (OVP), overcurrent protection (OCP) and mistake
The protection mechanisms such as temperature protection (OTP), to ensure that system safely and reliably works.LED light source uses white light LEDs integrated optical source, root
The power and operating voltage of LED integrated optical sources are selected according to automobile storage battery voltage and auto lamp brightness requirement.
The course of work of whole device is：
12V the or 24V DC voltages of automobile storage battery are added to the regulator circuit being made of TL431, regulator circuit output all the way
Supply voltage of the stable DC voltage as subsequent pulse generation circuit；Another way is applied directly to constant-current drive circuit, as
The supply voltage of constant-current drive circuit.The load of constant-current drive circuit is LED light source.
When automobile ignition switch is opened, and headlight for vehicles switch is placed in on-position, headlight for vehicles is bright still not to work, or
Brightness size will also be by the strong control of natural light outside.External light intensity controls LED constant current by the linear visible light sensors of LXD
The output size of driving circuit.When ambient light reaches certain light intensity, headlight for vehicles extinguishes completely；Certain light is arrived when ambient light is weak
Qiang Shi, headlight for vehicles fully open；When ambient light, which is in headlight for vehicles, to be changed between extinguishing and fully open state completely.Arteries and veins
Rush the current-modulation that generator is generated by LXD after photosensitive, the pwm signal of output frequency and pulse width variation.This signal is added to
The ADJ pins of constant current drive integrated circult MT7285 realize PWM by the constant current value of the variation control TM7285 of pulse width
Light modulation.
It should be pointed out that specific implementation mode described above can make those skilled in the art that the present invention be more fully understood
Concrete structure, but do not limit the invention in any way create.Therefore, although specification and drawings and examples are to the present invention
Creation has been carried out detailed description, it will be understood by those skilled in the art, however, that still can be repaiied to the invention
Change or equivalent replacement；And technical solution and its improvement of all spirit and scope for not departing from the invention, cover
In the protection domain of the invention patent.
Claims (4)
1. light-operated LED car headlight control device, which is characterized in that driven including regulator circuit, pulse signal circuit and constant current
Circuit, regulator circuit input terminal connect direct voltage source, and circuit output end of pressure-stabilizing connects pulse signal generating circuit input terminal, arteries and veins
Signal generating circuit output end connection constant-current drive circuit signal input part is rushed, it is big that constant-current drive circuit output end connects automobile
Lamp；The pulse signal generating circuit includes triode VT1, triode VT1 emitters be separately connected circuit output end of pressure-stabilizing,
The 4th pin of base chip, the resistance R5 other ends are separately connected triode when the 8th pin of base chip, RC when the one end resistance R5, RC
VT1 base stages, triode VT2 collectors, base chip third pin when triode VT2 base stages meet RC, triode VT2 emitters pass through
Resistance R6 ground connection, triode VT1 collectors connect photosensitive sensor one end by resistance R4, and another termination sliding of photosensitive sensor becomes
Resistance device mono- fixing end of RP, the 7th pin of base chip when another fixing end of slide rheostat RP meets RC by resistance R7,
Base chip second pin when the 6th pin of base chip, the RC when mobile terminal of slide rheostat RP meets the one end capacitance C1, RC respectively, electricity
Hold C1 other ends ground connection, base the first pin of chip is grounded when RC, and the 5th pin of base chip is grounded by capacitance C2 when RC, base when RC
Chip third pin connects the signal input part of constant-current drive circuit；Photosensitive sensor is that the linear photosensor of model LXD/GB3 passes
Sensor；Base chip is IC7555 chips when the described RC.
2. light-operated LED car headlight control device according to claim 1, which is characterized in that the regulator circuit packet
Resistance R1 is included, resistance R1 mono- terminates direct voltage source, and the resistance R1 other ends connect pulse signal generating circuit input terminal, resistance respectively
The one end R2, the poles voltage stabilizing chip K, the resistance R2 other ends are separately connected the poles voltage stabilizing chip R and the one end resistance R3, another terminations of resistance R3
Ground, the poles the A ground connection of voltage stabilizing chip；The voltage stabilizing chip is TL431 chips.
3. light-operated LED car headlight control device according to claim 1, which is characterized in that the constant current driving electricity
Road includes constant-current driven chip U1, and the first pins of constant-current driven chip U1 meet triode VT11 emitters, resistance R11 mono- respectively
End, resistance R11 other ends ground connection, triode VT11 collectors meet diode D11 anodes, the one end inductance L11, inductance L11 respectively
The other end connects direct voltage source, the one end capacitance C11, the one end capacitance C14, LED combination light source cathode, the capacitance C11 other ends respectively
Ground connection, the capacitance C14 other ends connect diode D11 cathode, the one end resistance R13, constant-current driven chip U1 thirds pin, resistance respectively
The one end R14, the resistance R13 other ends connect LED combination light source anode, the 4th pins of constant-current driven chip U1 respectively, and resistance R14 is another
End connecting resistance R15 one end, the 7th pins of constant-current driven chip U1 respectively, resistance R15 other ends ground connection, constant-current driven chip U1 the
Two pins are grounded by capacitance C12, and the 5th pins of constant-current driven chip U1 are grounded by capacitance C13, constant-current driven chip U1
Nine pins are grounded, and the 6th pins of constant-current driven chip U1 connect the signal output end of pulse signal generating circuit by resistance R12；Institute
The model MT7285 of the constant-current driven chip U1 stated.
4. light-operated LED car headlight control device according to claim 3, which is characterized in that the LED combination light source
Including several concatenated white led lamps.
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| CN201611028908.9A CN106793245B (en) | 2016-11-22 | 2016-11-22 | Light-operated LED car headlight control device |
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| CN201611028908.9A CN106793245B (en) | 2016-11-22 | 2016-11-22 | Light-operated LED car headlight control device |
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| CN107314326B (en) * | 2017-08-18 | 2023-06-02 | 张玉森 | Invisible high beam |
| CN108337792B (en) * | 2018-03-29 | 2024-03-12 | 五羊—本田摩托（广州）有限公司 | Controller and control method for automatic induction control of car lamp |
| CN109068435B (en) * | 2018-06-12 | 2023-09-08 | 宁波市富来电子科技有限公司 | Automobile dimming circuit |
| CN111025986B (en) * | 2019-12-23 | 2025-03-18 | 武汉嘉晨电子技术股份有限公司 | An intelligent BDU insulation detection circuit |
| CN113038660B (en) * | 2021-04-21 | 2023-08-29 | 嘉兴市光泰照明有限公司 | LED turns to auxiliary lighting lamp control circuit |
| CN113613358A (en) * | 2021-08-04 | 2021-11-05 | 深圳市裕富照明有限公司 | Vehicle-mounted multipurpose lighting system |
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| CN106793245A (en) | 2017-05-31 |
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