CN206389581U - Light-operated LED car headlight control device - Google Patents
Light-operated LED car headlight control device Download PDFInfo
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- CN206389581U CN206389581U CN201621253293.5U CN201621253293U CN206389581U CN 206389581 U CN206389581 U CN 206389581U CN 201621253293 U CN201621253293 U CN 201621253293U CN 206389581 U CN206389581 U CN 206389581U
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Abstract
Light-operated LED car headlight control device of the present utility model, including mu balanced circuit, pulse signal circuit and constant-current drive circuit, mu balanced circuit input connects direct voltage source, circuit output end of pressure-stabilizing connects pulse signal generating circuit input, pulse signal generating circuit output end connects constant-current drive circuit signal input part, constant-current drive circuit output end connection headlight for vehicles.The device controls headlight for vehicles luminous intensity luminous strong with environment illumination intensity adjust automatically, is conducive to saving the energy.The device is slightly transformed, other illumination places are also applicable in, such as road, plaza lighting are with a wide range of applications.
Description
Technical field
The utility model is related to illumination, electronic technology, electric apparatus control apparatus, and specifically one kind is with environment illumination intensity
Change the light-operated LED car headlight control device of adjust automatically luminous intensity.
Background technology
With the maturation of LED technology, LED illumination lamp substitution traditional lighting light fixture has been trend of the times, LED illumination
Light fixture is also such as automobile lamp.Early stage, LED lamp is used merely as automobile lampet, and such as European legislation is provided, in order to travel
Safety, all vehicles on sale must all assemble LED side-marker lamps.In recent years, full car used LED lamp conduct including headlight
The vehicle of illuminator is more and more, including the famous vehicle such as benz, Audi.
Headlight (including high beam and dipped headlight) on existing automobile is all manual unlocking and closing, and luminous intensity can not
Adjust, 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 luminosity of headlight for vehicles is regulated and controled by ambient light, when ambient lighting is strong, lamp
Do 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, without 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. automatic reduction is remote during meeting
Light lamplight brightness, beneficial to driving safety.
Utility model content
In order to solve the above problems, the utility model provides a kind of light-operated LED car headlight control device, controls light-operated
The luminous intensity of LED automobile headlamp is luminous strong with environment illumination intensity adjust automatically, is conducive to saving the energy.
The utility model uses following technical scheme：
Light-operated LED car headlight control device, it is characterised in that driven including mu balanced circuit, pulse signal circuit and constant current
Dynamic circuit, mu balanced circuit input connection direct voltage source, circuit output end of pressure-stabilizing connection pulse signal generating circuit input,
Pulse signal generating circuit output end connects constant-current drive circuit signal input part, and constant-current drive circuit output end connection automobile is big
Lamp.
Further, described mu balanced circuit includes resistance R1, the termination direct voltage sources of resistance R1 mono-, the resistance R1 other ends
Pulse signal generating circuit input, resistance R2 one end, voltage stabilizing chip K poles are connect respectively, and the resistance R2 other ends connect voltage stabilizing respectively
Chip R poles and resistance R3 one end, resistance R3 other ends ground connection, the A poles ground connection of voltage stabilizing chip.
Further, described voltage stabilizing chip is TL431 chips.
Further, described pulse signal generating circuit includes triode VT1, and triode VT1 emitter stages are connected respectively
The pin of base chip the 4th, the resistance R5 other ends when pin of base chip the 8th, RC when circuit output end of pressure-stabilizing, resistance R5 one end, RC
Difference connecting triode VT1 base stages, triode VT2 colelctor electrodes, the pin of base chip the 3rd, three poles when triode VT2 base stages meet RC
Pipe VT2 emitter stages are grounded by resistance R6, and triode VT1 colelctor electrodes connect light sensor one end, light sensor by resistance R4
Another termination slide rheostat mono- fixing end of RP of device, when slide rheostat RP another fixing end meets RC by resistance R7
7th pin of base chip, when slide rheostat RP mobile terminal meets electric capacity C1 one end, RC respectively when the pin of base chip the 6th, RC
Base chip second pin, electric capacity C1 other ends ground connection, the pin of base chip first is grounded during RC, and the pin of base chip the 5th passes through during RC
Electric capacity C2 is grounded, and the pin of base chip the 3rd connects the signal input part of constant-current drive circuit during RC.
Further, light sensor is model LXD/GB3 linear photosensor sensor.
Further, base chip is IC7555 chips during described RC.
Further, described constant-current drive circuit includes constant-current driven chip U1, the pins of constant-current driven chip U1 first
Triode VT11 emitter stages, resistance R11 one end are connect respectively, and resistance R11 other ends ground connection, triode VT11 colelctor electrodes connect two respectively
Pole pipe D11 positive poles, inductance L11 one end, the inductance L11 other ends meet direct voltage source, electric capacity C11 one end, electric capacity C14 mono- respectively
End, LED combination light source negative pole, electric capacity C11 other ends ground connection, the electric capacity C14 other ends connect diode D11 negative poles, resistance respectively
R13 one end, the pins of constant-current driven chip U1 the 3rd, resistance R14 one end, the resistance R13 other ends are connecing LED combination light source just respectively
Pole, the pins of constant-current driven chip U1 the 4th, connecting resistance R15 one end, constant-current driven chip U1 the 7th draw the resistance R14 other ends respectively
Pin, resistance R15 other ends ground connection, constant-current driven chip U1 second pins are grounded by electric capacity C12, constant-current driven chip U1 the 5th
Pin is grounded by electric capacity C13, and the pins of constant-current driven chip U1 the 9th ground connection, the pins of constant-current driven chip U1 the 6th pass through resistance
R12 connects the signal output part of pulse signal generating circuit.
Further, described constant-current driven chip U1 model MT7285.
Further, described LED combination light source includes the white led lamps of some series connection.
The beneficial effects of the utility model are：
1st, constant-current drive circuit uses MT7285 constant-current driven chips and external MOS transistor drive circuits and white light LEDs
Combined light source constitutes a efficient, energy-saving LED light fixture for direct current supply.Described MT7285 chip input voltage scopes are wide
(2.5V-40V), can simulate light modulation by its ADJ pin and PWM is dimmed.
2nd, pulse-generating circuit produces the pulse electrical signal frequency exported in this programme and pulse width is emphasized by ambient light
System, the signal is applied directly to MT7285 ADJ pins, realizes PWM dimming functions.The device of induced environment intensity of illumination is selected can
See actinic sensor LXD/GB3-A1DPS, the change of the device equivalent internal resistance directly reflects the change of environmental light intensity.
3rd, in order that the stable pwm signal of output, pulse signal produces the supply voltage of part, constituted via TL431
Supplied after mu balanced circuit voltage stabilizing, can be with general for 12V gasoline automobiles and 24V diesel cars.
Brief description of the drawings
Fig. 1 is the utility model circuit principle structure figure.
Embodiment
Light-operated LED car headlight control device as shown in Figure 1, including mu balanced circuit, pulse signal circuit and constant current are driven
Dynamic circuit, mu balanced circuit input connection direct voltage source, circuit output end of pressure-stabilizing connection pulse signal generating circuit input,
Pulse signal generating circuit output end connects constant-current drive circuit signal input part, and constant-current drive circuit output end connection automobile is big
Lamp.
Mu balanced circuit includes resistance R1, and the termination direct voltage sources of resistance R1 mono-, the resistance R1 other ends connect pulse signal respectively
Generation circuit input, resistance R2 one end, voltage stabilizing chip K poles, the resistance R2 other ends connect voltage stabilizing chip R poles and resistance R3 respectively
One end, resistance R3 other ends ground connection, the A poles ground connection of voltage stabilizing chip.Wherein, described voltage stabilizing chip is TL431 chips.
The operation principle of mu balanced circuit is：
Automobile storage battery voltage is change in use, and especially in start-up course, 12V battery voltage can be reduced to 9V
Below.The voltage of this change is added to the mu balanced circuit being made up of TL431 and R1, R2, R3.TL431 is a kind of parallel voltage-stabilizing collection
Into 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 is 2.5V, and output voltage range is 2.5V-30V.Voltage stabilizing output voltage size by
R2 and R3 ratio determination, output voltage U=2.5 (1+R2/R3) V.When selecting R2=R3,5V galvanic currents are exported
Pressure.The pulse signal generating circuit that the load of the circuit is made up of low-power consumption IC7555 etc..
Pulse signal generating circuit include triode VT1, triode VT1 emitter stages connect respectively circuit output end of pressure-stabilizing,
The pin of base chip the 4th when the pin of base chip the 8th, RC when resistance R5 one end, RC, resistance R5 other ends difference connecting triode
VT1 base stages, triode VT2 colelctor electrodes, the pin of base chip the 3rd when triode VT2 base stages meet RC, triode VT2 emitter stages lead to
Resistance R6 ground connection is crossed, triode VT1 colelctor electrodes connect light sensor one end by resistance R4, and another termination of light sensor is slided
Mono- fixing end of rheostat RP, the 7th of base chip draws when slide rheostat RP another fixing end meets RC by resistance R7
Pin, base chip second draws when the pin of base chip the 6th, RC when slide rheostat RP mobile terminal meets electric capacity C1 one end, RC respectively
Pin, electric capacity C1 other ends ground connection, the pin of base chip first is grounded during RC, and the pin of base chip the 5th is grounded by electric capacity C2 during RC,
The pin of base chip the 3rd connects the signal input part of constant-current drive circuit during RC.Wherein, light sensor is model LXD/GB3
Linear photosensor sensor, base chip is IC7555 chips during described RC.
The principle of pulse signal generating circuit is as follows：
One astable multivibrator is constituted by IC7555, VT1, VT2, R4, LXD, RP, R7 and C1.IC7555 is to adopt
The RC time base circuits manufactured with CMOS technology, it has low-loss, extremely low port input current, wide power voltage scope (2V-
18V), the features such as working frequency is high, stability is good, has all surmounted 555 conventional time base circuits on many important performances.
LXD is visible-light linear sensor.Electric capacity C1 charge and discharge loop is：During t1, power supply by VT1, R4,
LXD and RPA charges to electric capacity C1；During t2, C1 is discharged by RPB, R7 and 7,555 7 pin.It should be noted that：(1) exist
C1 is charged to before 2/3 threshold level, and high level is presented in IC7555 3 pin, i.e.,：During t1, VT1 conductings, VT2 saturation conductions,
The internal resistance r of very little is presented in VT2VT2.(2) 7555 pin of triggering end (set end) 2 and threshold level end (reset terminal) 6 pin directly in
C1 simultaneously connects, after circuit start, and first threshold voltage during charging on electric capacity is 1/3*V2, and charging termination value is 2/3*V2.
Charging interval t1=0.693 (rVT1+R4+RLXD+ RPA) C1, discharge time t2=0.693 (RPB+R7) C1, in formula：
rVT1Equivalent internal resistance when being turned on for VT1, resistance very little when VT1 is turned on.RLXDFor the equivalent internal resistance under photo resistance ambient lighting,
Change with intensity of illumination.
It can be seen that by t1 formula, rVT1Change changes t1, 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.
Initial pulse width is determined by adjusting RP, the change of environmental light intensity makes LXD equivalent internal resistance RLXDChange, realize
The change of output pulse width.
The 3 pin output pwm signals that pulse signal producer passes through IC7555.
It should be noted that：(1) R4, RP selection., be just in order to adapt to different photoenvironments and obtain linearity light adjusting
The resistance value (i.e. R4, RP) that really selection charge circuit is connected with LXD.(2) LXD/GB3-A1DPS rated voltage is 12V,
Illumination-voltage curve can be changed by changing its input voltage.
Constant-current drive circuit includes constant-current driven chip U1, and the pins of constant-current driven chip U1 first meet triode VT11 respectively
Emitter stage, resistance R11 one end, resistance R11 other ends ground connection, triode VT11 colelctor electrodes connect diode D11 positive poles, inductance respectively
L11 one end, the inductance L11 other ends connect respectively direct voltage source, electric capacity C11 one end, electric capacity C14 one end, LED combination light source bear
Pole, electric capacity C11 other ends ground connection, the electric capacity C14 other ends connect diode D11 negative poles, resistance R13 one end, constant current driving core respectively
The pins of piece U1 the 3rd, resistance R14 one end, the resistance R13 other ends meet LED combination light source positive pole, constant-current driven chip U1 respectively
Four pins, resistance R14 other ends difference connecting resistance R15 one end, the pins of constant-current driven chip U1 the 7th, another terminations of resistance R15
Ground, constant-current driven chip U1 second pins are grounded by electric capacity C12, and the pins of constant-current driven chip U1 the 5th are connect by electric capacity C13
Ground, the pins of constant-current driven chip U1 the 9th ground connection, the pins of constant-current driven chip U1 the 6th connect pulse signal by resistance R12 and produced
The signal output part of circuit.Wherein, described constant-current driven chip U1 model MT7285.
The operation principle of constant-current drive circuit is：
MT7285 integrated circuits are used 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 the 6 of constant current drive integrated circult TM7825 through resistance R12
Pin (ADJ pin).ADJ pin are brightness and ON/OFF controlling switch, support simulation light modulation and PWM light modulations.Dimmed when with PWM
When, adapt to the square-wave signal that frequency is 100Hz to 10kHz, it is desirable to which signal amplitude is more than 1.6V.LED current is with pwm signal
The change of dutycycle changes between 5% -100%.
It should be further stated that：MT7285 chip internals 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 sources use white light LEDs integrated optical source, root
According to automobile storage battery voltage and the power and operating voltage of auto lamp brightness requirement selection LED integrated optical sources.
The course of work of whole device is：
12V the or 24V DC voltages of automobile storage battery are added to the mu balanced circuit being made up of TL431, mu balanced circuit output all the way
Stable DC voltage as subsequent pulse generation circuit supply voltage；Another road 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 control of natural light outside by force.Outside light intensity controls LED constant current by the linear visible light sensors of LXD
The output size of drive 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 is fully opened；When ambient light, which is in headlight for vehicles, to be changed completely between extinguishing and fully open state.Arteries and veins
Rush the pwm signal of the current-modulation that generator is produced by LXD after photosensitive, output frequency and pulse width variation.This signal is added to
Constant current drive integrated circult MT7285 ADJ pins, control TM7285 constant current value by the change of pulse width, realize PWM
Light modulation.
It should be pointed out that embodiment described above can make those skilled in the art that this practicality is more fully understood
New concrete structure, but limitation the utility model is not created in any way.Therefore, although specification and drawings and examples
The utility model is created and has been carried out detailed description, it will be understood by those skilled in the art, however, that still can be to this reality
Modified with new creation or equivalent substitution；And the technical side of all spirit and scope for not departing from the utility model creation
Case and its improvement, it is encompassed by the utility model and created among the protection domain of patent.
Claims (9)
1. light-operated LED car headlight control device, it is characterised in that including mu balanced circuit, pulse signal circuit and constant current driving
Circuit, mu balanced circuit input connection direct voltage source, circuit output end of pressure-stabilizing connection pulse signal generating circuit input, arteries and veins
Signal generating circuit output end connection constant-current drive circuit signal input part is rushed, constant-current drive circuit output end connection automobile is big
Lamp.
2. light-operated LED car headlight control device according to claim 1, it is characterised in that described mu balanced circuit bag
Resistance R1 is included, the termination direct voltage sources of resistance R1 mono-, the resistance R1 other ends connect pulse signal generating circuit input, resistance respectively
R2 one end, voltage stabilizing chip K poles, the resistance R2 other ends connect voltage stabilizing chip R poles and resistance R3 one end, another terminations of resistance R3 respectively
Ground, the A poles ground connection of voltage stabilizing chip.
3. light-operated LED car headlight control device according to claim 2, it is characterised in that described voltage stabilizing chip is
TL431 chips.
4. light-operated LED car headlight control device according to claim 1, it is characterised in that described pulse signal production
Raw circuit includes triode VT1, base core when triode VT1 emitter stages connect circuit output end of pressure-stabilizing, resistance R5 one end, RC respectively
The pin of base chip the 4th when the pin of piece the 8th, RC, resistance R5 other ends difference connecting triode VT1 base stages, triode VT2 current collections
Pole, the pin of base chip the 3rd when triode VT2 base stages meet RC, triode VT2 emitter stages are grounded by resistance R6, triode VT1
Colelctor electrode connects light sensor one end by resistance R4, and another termination slide rheostat mono- fixing end of RP of light sensor is sliding
7th pin of base chip, slide rheostat RP mobile terminal when dynamic rheostat RP another fixing end meets RC by resistance R7
Base chip second pin when the pin of base chip the 6th, RC when meeting electric capacity C1 one end, RC respectively, electric capacity C1 other ends ground connection, during RC
The pin of base chip first is grounded, and the pin of base chip the 5th is grounded by electric capacity C2 during RC, and the pin of base chip the 3rd connects constant current during RC
The signal input part of drive circuit.
5. light-operated LED car headlight control device according to claim 4, it is characterised in that light sensor is model
For LXD/GB3 linear photosensor sensor.
6. light-operated LED car headlight control device according to claim 4, it is characterised in that base chip during described RC
For IC7555 chips.
7. light-operated LED car headlight control device according to claim 1, it is characterised in that described constant current driving electricity
Road includes constant-current driven chip U1, and the pins of constant-current driven chip U1 first meet triode VT11 emitter stages, resistance R11 mono- respectively
End, resistance R11 other ends ground connection, triode VT11 colelctor electrodes connect diode D11 positive poles, inductance L11 one end, inductance L11 respectively
The other end connects direct voltage source, electric capacity C11 one end, electric capacity C14 one end, LED combination light source negative pole, the electric capacity C11 other ends respectively
Ground connection, the electric capacity C14 other ends connect diode D11 negative poles, resistance R13 one end, the pins of constant-current driven chip U1 the 3rd, resistance respectively
R14 one end, the resistance R13 other ends connect LED combination light source positive pole, the pins of constant-current driven chip U1 the 4th respectively, and resistance R14 is another
End connecting resistance R15 one end, the pins of constant-current driven chip U1 the 7th respectively, resistance R15 other ends ground connection, constant-current driven chip U1 the
Two pins are grounded by electric capacity C12, and the pins of constant-current driven chip U1 the 5th are grounded by electric capacity C13, constant-current driven chip U1
Nine pins are grounded, and the pins of constant-current driven chip U1 the 6th connect the signal output part of pulse signal generating circuit by resistance R12.
8. light-operated LED car headlight control device according to claim 7, it is characterised in that described constant current driving core
Piece U1 model MT7285.
9. light-operated LED car headlight control device according to claim 7, it is characterised in that described LED combination light source
Include the white led lamps of some series connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621253293.5U CN206389581U (en) | 2016-11-22 | 2016-11-22 | Light-operated LED car headlight control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621253293.5U CN206389581U (en) | 2016-11-22 | 2016-11-22 | Light-operated LED car headlight control device |
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| Publication Number | Publication Date |
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| CN206389581U true CN206389581U (en) | 2017-08-08 |
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ID=59486575
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| Application Number | Title | Priority Date | Filing Date |
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| CN201621253293.5U Active CN206389581U (en) | 2016-11-22 | 2016-11-22 | Light-operated LED car headlight control device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106793245A (en) * | 2016-11-22 | 2017-05-31 | 聊城市科特祥瑞新能源有限公司 | Light-operated LED car headlight control device |
-
2016
- 2016-11-22 CN CN201621253293.5U patent/CN206389581U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106793245A (en) * | 2016-11-22 | 2017-05-31 | 聊城市科特祥瑞新能源有限公司 | Light-operated LED car headlight control device |
| CN106793245B (en) * | 2016-11-22 | 2018-09-04 | 聊城市科特祥瑞新能源有限公司 | Light-operated LED car headlight control device |
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