CN108235519A - A kind of LED backlight drive circuit for electric vehicle - Google Patents
A kind of LED backlight drive circuit for electric vehicle Download PDFInfo
- Publication number
- CN108235519A CN108235519A CN201810082143.XA CN201810082143A CN108235519A CN 108235519 A CN108235519 A CN 108235519A CN 201810082143 A CN201810082143 A CN 201810082143A CN 108235519 A CN108235519 A CN 108235519A
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- 238000004146 energy storage Methods 0.000 claims abstract description 7
- 230000005611 electricity Effects 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 5
- 238000006243 chemical reaction Methods 0.000 abstract description 4
- 230000005669 field effect Effects 0.000 abstract description 3
- 230000001939 inductive effect Effects 0.000 abstract description 2
- 238000005070 sampling Methods 0.000 abstract description 2
- 239000004973 liquid crystal related substance Substances 0.000 description 15
- 238000005516 engineering process Methods 0.000 description 4
- 238000005286 illumination Methods 0.000 description 3
- 230000005142 aphototropism Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 238000005034 decoration Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000003760 hair shine Effects 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 239000003550 marker Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 229910052724 xenon Inorganic materials 0.000 description 1
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
-
- 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
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Abstract
The invention discloses a kind of LED backlight drive circuit for electric vehicle, including the first to the 5th capacitance, EL7516 chips, inductance, the first to the 6th resistance, first to third diode and first to N light emitting diodes；The external 6th resistance R6 of the first pin, the 4th capacitance C4 of EL7516 chips carry out frequency compensation, and the third pin of EL7516 chips connects power supply closing.7th pin of EL7516 chips meets VDD；6th pin input voltage of EL7516 chips can be 2~6 VDC, output voltage is sent into the second pin of EL7516 chips through 3rd resistor R3, the sampling of the 4th resistance R4 divider, and with internal thresholding relatively after, through PWM logic controller driving FET grids, the 5th pin connection energy storage inductor L of EL7516 chips.When the internal fet conducting of EL7516 chips, inputing power is stored in inductance L.When field-effect tube turns off, power supply is superimposed driving LED street lamp string with inductive energy storage.Small, reliable operation of the invention, and high conversion efficiency, can reach energy-saving and environment-friendly effect.
Description
Technical field
The present invention relates to electric vehicle display technology field, particularly a kind of LED backlight for electric vehicle drives electricity
Road.
Background technology
Present most of vehicles are still using common halogen regenerative-cycle headlamp, and better vehicle can use xenon headlight.Most
Mostly it is the efficiency structurally done some innovations, light is improved using lens, reflectoscope optical principle in lamp group, but lamp group
Technological innovation itself is insufficient.LED automobile lamp refers to interior outer light source using LED technology, for external and interior lighting.It can
LED automobile lamp is widely used to build environment inside car, is 50,000 hours with the service life, LED's is firm in structure, it is not easy to vibrated
Influence, during use light output brightness will not be decreased obviously, continuous infiltrations of the LED in automobile external illumination application is increasingly
Replace traditional lighting solution, need a kind of more efficient, more steady, more cost advantage electronic device and driver
IC, so that the advantage of LED is not fully exerted in such application.This critical elements in LED illumination System, it is indicated that opening
Send out factor needed to be considered when the outer lamps of LED drive electronic architecture.LED automobile lamp is suitable for the various illumination applications of automotive electronics,
Including headlight（High beam and dipped headlight）, fog lamp, taillight, brake lamp, turn signal lamp, day driving lamp, courtesy light, instrument
Table lamp, license plate lamp, vehicle door lamp, room light lamp, side-marker lamp, navigation, entertainment systems, backlight and indicator light etc..These characteristics
Designed including LED radiating managements, the system that different LED is neatly driven to be configured and have cost advantage etc..Light emitting diode
（LED）Automotive field application more than 15 years.Past, it is possible to provide color and power level the application of LED is limited in
The taillight mixed lighting function of instrument board, internal lamp decoration and some low-power consumption.
Science and technology flourishes now, and information product type is weeded out the old and bring forth the new, and meets public different demand.Early stage display
Mostly it is cathode-ray tube（Cathode Ray Tube, CRT）Display, due to its bulky big, Er Qiesuo with power consumption
The radiation of generation is for user of the long-time using display, the problem of harmful body.Therefore, now on the market
Display gradually will be by liquid crystal display（Liquid Crystal Display, LCD）Replace old CRT displays.
Liquid crystal display has many merits such as thin fuselage, power saving, radiationless, is widely used.Existing market
On liquid crystal display largely for backlight liquid crystal display, including liquid crystal display panel and backlight module.The work of liquid crystal display panel
It is that liquid crystal molecule is placed in the parallel glass substrate of two panels as principle, and applies driving voltage on two panels glass substrate
The direction of rotation of liquid crystal molecule is controlled, the light of backlight module is reflected into generation picture.Due to liquid crystal display panel in itself not
It shines, needs the light source provided by backlight module normally to show image, therefore, backlight module becomes the pass of liquid crystal display
One of key spare part.Backlight module is divided into side entrance back module and down straight aphototropism mode set according to the difference of light source incidence position
Two kinds.Down straight aphototropism mode set is by illuminating source such as CCFL (Cold CathodeFluorescent Lamp, cathodouminescence
Fluorescent tube) or LED (Light Emitting Diode, light emitting diode) be arranged on liquid crystal display panel rear, direct forming face light
Source is supplied to liquid crystal display panel.And side entrance back module is that backlight LED lamp bar is set on to the backboard side at liquid crystal display panel side rear
Edge, the incidence surface of the light that LED lamp bars are sent out from light guide plate side enter light guide plate, go out after reflection and diffusion from light guide plate
Smooth surface projects, and via optical diaphragm group, liquid crystal display panel is supplied to form area source.
Backlight drive circuit driving LED lamp strings in backlight module shine, and then provide backlight.In existing backlight
Include LED constant-current driven chips in driving circuit, which has the function of output over-voltage protection, when
When LED lamp strings open circuit occurs in circuit, it is zero, LED constant currents that LED constant-current driven chips, which detect this LED lamp string negative terminal voltage,
Driving chip will be considered that output voltage is not caused enough, so drive signal duty cycle of the output to MOS pipes can be increased,
Duty ratio is bigger, and the output voltage of backlight drive circuit is bigger, and output voltage will rise, because when LED lamp strings are opened a way, LED
Constant-current driven chip is detected always has voltage less than LED lamp string negative terminals, control output voltage can rise always.It is if not defeated
Go out over-voltage protecting function, output voltage increases always, and when more than the pressure resistance of the component of back-end circuit, component can be hit
Wear in addition will appear it is on fire burn, there are security risks；Existing driving circuit size is larger, and transfer efficiency is not high.
Invention content
The technical problems to be solved by the invention are overcome the deficiencies in the prior art and provide a kind of for electric vehicle
LED backlight drive circuit, small, reliable operation of the invention, and high conversion efficiency, reach energy-saving and environment-friendly effect.
The present invention uses following technical scheme to solve above-mentioned technical problem：
According to a kind of LED backlight drive circuit for electric vehicle proposed by the present invention, including the first to the 5th capacitance,
EL7516 chips, inductance, the first to the 6th resistance, first to third diode and first are to N light emitting diodes；Wherein,
6th pin of EL7516 chips and one end of the first capacitance, one end of the second capacitance, EL7516 chips the 7th pin,
The third pin of EL7516 chips, one end of first resistor, power supply connect respectively, the 8th pin and third of EL7516 chips
One end connection of capacitance, the other end of third capacitance and the other end of the second capacitance, the other end of the first capacitance, EL7516 chips
The 4th pin, one end of the 4th capacitance, one end of the 4th resistance, one end of the 5th capacitance, the 5th resistance one end, respectively
Connection, the first pin of EL7516 chips connect with one end of the 6th resistance, and the other end of the 6th resistance is another with the 4th capacitance
One end connects, and the second pin of EL7516 chips and one end of second resistance, the negative pole end of third diode connect respectively, and second
The other end of resistance is connect with the negative pole end of the second diode, the other end of the positive terminal of the second diode and the 4th resistance,
One end of three resistance connects respectively, the other end of the positive terminal of third diode and the 5th resistance, the cathode of N light emitting diodes
End connects respectively, and N number of light emitting diode is sequentially connected in series, and the positive terminal of the 1st light emitting diode is another with the 5th capacitance
One end, the other end of 3rd resistor, the first diode negative pole end connect respectively, the other end of first resistor and one end of inductance
Connection, the other end of inductance are connect respectively with the positive terminal of the 5th pin of EL7516 chips, the first diode.
Scheme, power supply are advanced optimized as a kind of LED backlight drive circuit for electric vehicle of the present invention
For+5V power supplys.
Scheme, inductance are advanced optimized as a kind of LED backlight drive circuit for electric vehicle of the present invention
For energy storage inductor.
Scheme, third are advanced optimized as a kind of LED backlight drive circuit for electric vehicle of the present invention
Resistance is identical with the resistance value of the 4th resistance.
Scheme is advanced optimized as a kind of LED backlight drive circuit for electric vehicle of the present invention, N is big
In 3 integer.
The present invention compared with prior art, has following technique effect using above technical scheme：
（1）Small, reliable operation of the invention, and high conversion efficiency, can reach energy-saving and environment-friendly effect；
（2）Present invention reduces production cost, while LED constant-current driven chips are preferably protected, avoid what it was smashed by high pressure
Risk.
Description of the drawings
Fig. 1 is schematic structural view of the invention.
Specific embodiment
Technical scheme of the present invention is described in further detail below in conjunction with the accompanying drawings：
As shown in Figure 1, a kind of LED backlight drive circuit for electric vehicle, including the first to the 5th capacitance C1-C5,
EL7516 chips, inductance L, the first to the 6th resistance R1-R6, first to third diode D1-D3 and first to N light-emitting diodes
Pipe LED1-LEDN；Wherein, the 6th pin of EL7516 chips and one end of the first capacitance, one end of the second capacitance, EL7516 cores
The 7th pin, the third pin of EL7516 chips, one end of first resistor, the power supply of piece connect respectively, EL7516 chips
8th pin is connect with one end of third capacitance, the other end of the other end of third capacitance and the second capacitance, the first capacitance it is another
One end, the 4th pin of EL7516 chips, one end of the 4th capacitance, one end of the 4th resistance, one end of the 5th capacitance, the 5th electricity
One end of resistance, connect respectively, the first pin of EL7516 chips is connect with one end of the 6th resistance, the other end of the 6th resistance
It is connect with the other end of the 4th capacitance, the second pin of EL7516 chips and one end of second resistance, the cathode of third diode
End connects respectively, and the other end of second resistance is connect with the negative pole end of the second diode, the positive terminal of the second diode and the 4th
The other end of resistance, one end of 3rd resistor connect respectively, the other end, the N of the positive terminal of third diode and the 5th resistance
The negative pole end of light emitting diode connects respectively, and N number of light emitting diode is sequentially connected in series, the anode of the 1st light emitting diode
End connect respectively with the negative pole end of the other end of the 5th capacitance, the other end of 3rd resistor, the first diode, first resistor it is another
One end and one end of inductance connect, the other end of inductance and the 5th pin of EL7516 chips, the positive terminal point of the first diode
It does not connect.
Power supply is+5V power supplys, and inductance is energy storage inductor.3rd resistor is identical with the resistance value of the 4th resistance.N is more than 3
Integer.
The EL7516 chips that the present invention uses are a typical boost chips, work in 1.2 MHz and determine frequency PWM mode,
Built-in 1.6 A, 200 m Ω field-effect transistors.The external 6th resistance R6 of the first pin (COMP ends) of EL7516 chips, the 4th
Capacitance C4 carries out frequency compensation, and the third pin (SHDN ends) of EL7516 chips connects power supply closing.The 7th of EL7516 chips draws
Foot meets VDD, 1.2 MHz of setting frequency；6th pin input voltage of EL7516 chips can be 2~6 VDC, and output voltage passes through
3rd resistor R3, the sampling of the 4th resistance R4 divider are sent into the second pin (FB feedback ends) of EL7516 chips, and and interior door
After limiting relatively, through PWM logic controller driving FET grids, the 5th foot (Lx) the end pole connection energy storage electricity of EL7516 chips
Feel L.When the internal fet conducting of EL7516 chips, inputing power is stored in inductance L.When field-effect tube turns off
When, power supply is superimposed driving LED street lamp string with inductive energy storage（First to N light emitting diodes）, can be by changing the 5th resistance
R5 adjusts the electric current of the LED for electric vehicle.
Small, reliable operation of the invention, and high conversion efficiency, can reach energy-saving and environment-friendly effect；The present invention reduces
Production cost, while preferably protect LED constant-current driven chips.
The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, it is impossible to assert
The specific implementation of the present invention is confined to these explanations.For those of ordinary skill in the art to which the present invention belongs, exist
Under the premise of not departing from present inventive concept, several simple deductions or replacement can also be made, should all be considered as belonging to the present invention's
Protection domain.
Claims (5)
1. a kind of LED backlight drive circuit for electric vehicle, which is characterized in that including the first to the 5th capacitance, EL7516
Chip, inductance, the first to the 6th resistance, first to third diode and first are to N light emitting diodes；Wherein, EL7516 cores
6th pin of piece and one end of the first capacitance, one end of the second capacitance, the 7th pin of EL7516 chips, EL7516 chips
Third pin, one end of first resistor, power supply connect respectively, and the 8th pin of EL7516 chips connects with one end of third capacitance
Connect, the other end of the other end of third capacitance and the second capacitance, the other end of the first capacitance, EL7516 chips the 4th pin,
One end of 4th capacitance, one end of the 4th resistance, one end of the 5th capacitance, the 5th resistance one end, connect respectively, EL7516
First pin of chip is connect with one end of the 6th resistance, and the other end of the 6th resistance is connect with the other end of the 4th capacitance,
The second pin of EL7516 chips and one end of second resistance, the negative pole end of third diode connect respectively, second resistance it is another
One end is connect with the negative pole end of the second diode, the other end of the positive terminal of the second diode and the 4th resistance, 3rd resistor
One end connects respectively, and the positive terminal of third diode connects respectively with the other end of the 5th resistance, the negative pole end of N light emitting diodes
It connects, N number of light emitting diode is sequentially connected in series, the positive terminal of the 1st light emitting diode and the other end, the third of the 5th capacitance
The other end of resistance, the first diode negative pole end connect respectively, one end of the other end of first resistor and inductance connects, inductance
The other end connect respectively with the positive terminal of the 5th pin of EL7516 chips, the first diode.
2. a kind of LED backlight drive circuit for electric vehicle according to claim 1, which is characterized in that power supply for+
5V power supplys.
3. a kind of LED backlight drive circuit for electric vehicle according to claim 1, which is characterized in that inductance is
Energy storage inductor.
A kind of 4. LED backlight drive circuit for electric vehicle according to claim 1, which is characterized in that third electricity
Resistance is identical with the resistance value of the 4th resistance.
5. a kind of LED backlight drive circuit for electric vehicle according to claim 1, which is characterized in that N be more than
3 integer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810082143.XA CN108235519A (en) | 2018-01-29 | 2018-01-29 | A kind of LED backlight drive circuit for electric vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810082143.XA CN108235519A (en) | 2018-01-29 | 2018-01-29 | A kind of LED backlight drive circuit for electric vehicle |
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| Publication Number | Publication Date |
|---|---|
| CN108235519A true CN108235519A (en) | 2018-06-29 |
Family
ID=62668934
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|---|---|---|---|
| CN201810082143.XA Pending CN108235519A (en) | 2018-01-29 | 2018-01-29 | A kind of LED backlight drive circuit for electric vehicle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111030445A (en) * | 2018-10-09 | 2020-04-17 | 西安智盛锐芯半导体科技有限公司 | Voltage conversion circuit with multiple power supply interfaces adapted |
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