CN104442400B - A kind of automobile instrument outer casing and backlight assembly - Google Patents
A kind of automobile instrument outer casing and backlight assembly Download PDFInfo
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- CN104442400B CN104442400B CN201410709828.4A CN201410709828A CN104442400B CN 104442400 B CN104442400 B CN 104442400B CN 201410709828 A CN201410709828 A CN 201410709828A CN 104442400 B CN104442400 B CN 104442400B
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Abstract
nullThe present invention proposes a kind of automobile instrument outer casing and backlight assembly，Backlight assembly includes: anti-surge circuit、Buzzer drive circuit、Synthetic data display circuit、Backlight conditioned circuit、Extension drive circuit of indicator and anti static device、CPU，Anti-surge circuit outfan connects cpu power input respectively、Buzzer drive circuit power input、Synthetic data display circuit power input、Backlight conditioned circuit power input and extension drive circuit of indicator power input，Described synthetic data display circuit signal output part connects backlight conditioned circuit signal input part，Described synthetic data display circuit buzzer signal outfan connects buzzer drive circuit signal input part，Described synthetic data display circuit display lamp signal output part connects extension indicator light circuit signal input part，Described extension drive circuit of indicator signal output part connects backlight conditioned circuit signal input part.
Description
Technical field
The present invention relates to electronic circuit field, particularly relate to a kind of automobile instrument outer casing and backlight assembly.
Background technology
In prior art, automobile instrument outer casing has not been used to be mounted directly the structure of backlight assembly, described
Backlight assembly is all directly installed in PCB combination, and PCB combination is then installed in the enclosure, and shell is the most right
The position of backlight assembly has breach of stepping down, and is also equipped with screen board on shell, has LCD on screen board
Window, this LCD window mouth just LCD viewing area to backlight assembly.So, backlight assembly passes through
PCB integrated positioning, screen board is then positioned by shell, owing to positioning datum is inconsistent, easily leads
Causing the LCD viewing area on backlight assembly can not be fully aligned with the LCD window mouth on screen board.
When using automobile instrument to carry out buzzer warning, for the user, its sound is very rapid,
And the time is the shortest, it is impossible to user is played sound forewarning function, and the waveform of buzzer slowly rises
Rapid decrease, when buzzer sounding, sound occurs small and weak, and last or end syllable is short, and can not be by changing resistance
Size change last or end syllable length such as Fig. 1；
Automobile instrument is constantly declining in the ability resisting surge voltage, and the precision instrument in instrument is at surge
In voltage generating process, constantly damaging circuit and parts thereof, the safe and stable operation for automobile instrument is made
Become serious impact；
Under vehicle body complexity electromagnetic interference, the ESD Electrostatic Treatment of automobile instrument pcb board liquid crystal display screen is proposed
Higher requirement, and the characteristic of liquid crystal display screen itself determines the resistance ESD electrostatic capacity of liquid crystal display screen monomer relatively
Weak, need to improve the automobile instrument anlistatig ability of PCB liquid crystal display screen；
Automobile instrument shows function from strength to strength, but it simply possesses the display function on some bases, bag
Include the Back ground Information display function of speed, rotating speed, fuel oil, water temperature and some alarm lamps, for modern
Demand for, its traditional function can not meet far away the many demands of user；
The alarm lamp of display on vehicle-mounted automobile instrument is got more and more, simultaneously need to the display reported to the police
Device is also more and more, in the LED warning indication scheme that orthodox car instrument alarm indicator mode controls
All display lamps can not be controlled simultaneously；
Demand for automobile display function also changes occurring, and people pursue diversified automobile and control
Experience, especially to automobile instrument, be not only simple display background light, particularly with automobile instrument
LCD backlight and hornbook, pointer brightness was in the past to immobilize, inadequate hommization.
Summary of the invention
It is contemplated that at least solve technical problem present in prior art, the most innovatively propose one
Automobile instrument outer casing and backlight assembly.
In order to realize the above-mentioned purpose of the present invention, the invention provides a kind of automobile instrument outer casing and backlight group
Part, including the housing 1 of strip, being connected with two below and be symmetrically arranged at described housing 1
Lower fixing journal stirrup 6, have the first hole, location 6a and the first mistake on journal stirrup 6 the most side by side often once fixing
Hole 6b, wherein the first location hole 6a is positioned at the inner of lower fixing journal stirrup 6, is provided with the most side by side on housing 1
Two the first circular grooves 2, it it is critical only that: the middle part concave shape forward of described housing 1 is rectangular
Second groove 4 and the stage portion 5 of strip, described second groove 4 and stage portion 5 be positioned at two first recessed
Between groove 2, the wherein symmetrical the right and left being distributed in the second groove 4 of stage portion 5, stage portion 5
Bottom surface higher than the bottom surface of the second groove 4, each described stage portion 5 all has upper and lower two rectangles
Hole clipping 5a；The backlight assembly 7 of rectangle, a left side for described backlight assembly 7 are installed in described second groove 4
Right both sides are respectively connected with and hole clipping 5a buckle 7a one to one, and described buckle 7a buckles into corresponding hole clipping 5a
In；
Also having the light-conductive hole 3 of M rectangle on described housing 1, described light-conductive hole 3 is arranged side by side in
The top of the second groove 4, described M is positive integer；
Described backlight assembly 7 includes: anti-surge circuit, buzzer drive circuit, synthetic data display circuit,
Backlight conditioned circuit, extension drive circuit of indicator and anti static device, CPU,
Anti-surge circuit outfan connects cpu power input, the input of buzzer drive circuit power supply respectively
End, synthetic data display circuit power input, backlight conditioned circuit power input and extension display lamp drive
Galvanic electricity road power input, described synthetic data display circuit signal output part connects backlight conditioned circuit signal
Input, it is defeated that described synthetic data display circuit buzzer signal outfan connects buzzer drive circuit signal
Entering end, described synthetic data display circuit display lamp signal output part connects extension indicator light circuit signal input
End, described extension drive circuit of indicator signal output part connects backlight conditioned circuit signal input part,
Around anti static device around the pcb board winding displacement of automobile instrument backlight assembly 7, it is used for preventing electromagnetism
Interference；
Anti-surge circuit includes: the 4th diode, the second diode, the 6th electric capacity, the 9th electric capacity and first
IC chip,
4th diode cathode connects buzzer drive circuit power input, synthetic data display circuit power supply
Input, backlight conditioned circuit power input, extension display lamp drive power input and cpu power
Input, described 4th diode cathode connects the second diode cathode, and described second diode cathode connects
6th electric capacity one end, the described 6th electric capacity other end connects an IC chip input, a described IC core
Sheet outfan connects the 9th electric capacity other end described in the 9th electric capacity one end and connects an IC chip replacement delay
End；
Buzzer drive circuit includes, buzzer, the first diode, the 3rd resistance, the second electric capacity, second
Transistor, the 4th transistor,
Buzzer one end connects the first diode cathode, the described buzzer other end is just connecting the first diode
Pole, described first diode cathode is also connected with the 3rd resistance one end, and described first diode cathode is also connected with
The three resistance other ends, described 3rd resistance one end connects second electric capacity one end, and the described 3rd resistance other end is even
Connecing the second electric capacity other end, described first diode cathode connects the 4th transistor source, described one or two pole
Pipe negative pole connects transistor seconds grid；
Synthetic data display device includes: geomagnetic sensor, baroceptor, GPS module,
Geomagnetic sensor signal output part connects the Geomagnetic signal input of CPU, and described baroceptor is believed
Number outfan connects the air pressure signal input of CPU, and described GPS module signal output part connects CPU
Gps signal input, LCD display device data signal input connect CPU data signal output
End, geomagnetic sensor and baroceptor pass through I2C communication bus is attached with CPU；
Extension drive circuit of indicator includes: power-supplying circuit, a MCU, LED drive circuit,
Described anti-surge circuit power output end connects MCU feeder ear and a LED drive circuit respectively
Power input, described LED drive circuit outfan connects N number of LED alarm lamp, and described N is just
Integer, LED alarm lamp is placed at light-conductive hole 3；
Backlight conditioned circuit includes: the 9th resistance, the tenth resistance, the 2nd MCU, the 13rd resistance,
14 resistance, drive circuit, the 5th transistor, hornbook backlight circuit, pointer backlight circuit, LCD
Lamp,
9th resistance one end connects adjustable pwm pulse signal end, and the described 9th resistance other end connects
Tenth resistance one end, the described tenth resistance other end connects the 2nd MCU pulse signal input terminal, and described the
Two MCU hornbook backlight signal outfans connect the 13rd resistance one end, the described 13rd resistance other end
Connecting the 14th resistance one end and the 5th transistor drain respectively, the described 14th resistance other end connects the 5th
Transistor gate, described 5th transistor source connects hornbook backlight circuit, described 2nd MCU pointer
Backlight signal outfan connects drive circuit input, and described drive circuit outfan connects LCD lamp respectively
With pointer backlight circuit；
Pcb board 8 anti static device of automobile instrument backlight assembly includes: shading ring 11, liquid crystal display screen winding displacement
Connect pin 12, automobile instrument earth terminal 13, wire 14, outside port 15, magnetic bead 10；
Shading ring 11 is looped around described pcb board 8 surrounding, and described pcb board 8 winding displacement is connected to liquid crystal display screen
Winding displacement connects on pin 12, and electric charge produced by described pcb board 16 winding displacement is shielded by shading ring 11,
Described shading ring 11 connects automobile instrument earth terminal 13, and described outside port 15 connects vapour by wire 14
Car instrumentation grounding end 13, described shading ring 11 and automobile instrument earth terminal 13 is connected by magnetic bead 10 and carries out
The release of electric charge.
Described automobile instrument outer casing and backlight assembly, it is preferred that described anti-surge circuit also includes that the 3rd is auxiliary
Diode D3, described 3rd booster diode positive pole is helped to connect the second diode cathode, described 3rd auxiliary
Diode cathode connects the second diode cathode.
Described automobile instrument outer casing and backlight assembly, it is preferred that described geomagnetic sensor also includes: the
15 electric capacity, the 14th electric capacity, the 10th electric capacity, the 11st electric capacity, the 36th electric capacity, the 11st resistance；
Described 15th electric capacity, the 14th electric capacity and the 36th electric capacity parallel connection one end connect geomagnetic sensor power supply and supply
Electricity end and interface power feeder ear, described 15th electric capacity, the 14th electric capacity and the 36th electric capacity parallel connection other end
Ground connection, described geomagnetic sensor magnetic reset cap end connects the 10th electric capacity one end, the described 10th electric capacity other end
Ground connection, the 11st resistance one end connects geomagnetic sensor and resets end, described 11st resistance other end ground connection, institute
State geomagnetic sensor internal voltage regulator output shunt capacitance connect end connect the 11st electric capacity one end, the described 11st
Electric capacity other end ground connection.
Described automobile instrument outer casing and backlight assembly, it is preferred that described buzzer drive circuit also includes:
4th resistance, the 5th resistance, the 6th resistance, the 3rd electric capacity, third transistor,
3rd electric capacity one end connects automobile instrument anti-surge circuit power input and the 4th resistance one end respectively,
The described 4th resistance other end connects the 5th resistance one end and third transistor drain electrode, described third transistor source
Pole connects the 6th resistance one end, and the described 6th resistance other end connects the first transistor drain electrode, described 5th electricity
The resistance other end connects the 3rd electric capacity other end, after the described 5th electric capacity other end is also connected with third transistor grid
Ground connection.
Described automobile instrument outer casing and backlight assembly, it is preferred that described baroceptor also includes: the
24 resistance, the 25th resistance, the 12nd electric capacity, the 13rd resistance, the 37th electric capacity；
Described 24th resistance one end connects power voltage supply end, and the described 24th resistance other end connects air pressure sensing
Device I2C sequential clock end, described 25th resistance one end connect power voltage supply end, described 25th resistance another
End connects baroceptor I2C sequence data end, described 12nd electric capacity, the 13rd electric capacity, the 37th electric capacity
One end in parallel connects power voltage supply end and baroceptor feeder ear, described 12nd electric capacity, the 13rd electric capacity,
37th electric capacity parallel connection other end ground connection.
Described automobile instrument outer casing and backlight assembly, it is preferred that described hornbook backlight circuit includes: the
18 resistance, the 19th resistance, the 20th resistance, the 6th light emitting diode, the 7th light emitting diode,
18th resistance one end connects the first transistor source electrode, and the described 18th resistance other end connects the respectively
Six light emitting diode negative poles and the 19th resistance one end, it is luminous that described 6th light emitting diode positive pole connects the 7th
Diode cathode and the 19th resistance other end, the described 19th resistance other end is also connected with the 20th resistance one
End, the described 20th resistance other end connects the 7th light emitting diode positive pole, and described 7th light emitting diode is just
Pole connects power end.
Described automobile instrument outer casing and backlight assembly, it is preferred that described pointer backlight circuit includes: the tenth
Five resistance, the 21st resistance, the 22nd resistance, the 8th light emitting diode, the 9th light emitting diode,
Described 15th resistance one end connects drive circuit signal output part, and the described 15th resistance other end is even
Connecing the 8th light emitting diode negative pole and the 21st resistance one end, described 8th light emitting diode positive pole connects respectively
Connecing the 9th light emitting diode negative pole and the 21st resistance other end, the described 21st resistance other end also connects
Connecing the 22nd resistance one end, the described 22nd resistance other end connects the 9th light emitting diode positive pole, institute
State the 9th light emitting diode positive pole and be also connected with power end.
Described automobile instrument outer casing and backlight assembly, it is preferred that described anti static device also includes single line pin
17,
Single line pin 17 one end connects automobile instrument earth terminal 13, and described single line pin 17 other end passes through metal
Clamping part held tight shading ring 11；
Described automobile instrument outer casing and backlight assembly, it is preferred that described anti static device also includes: seal
Circle 9,
Sealing described sealing ring 9 along automobile instrument surrounding, automobile instrument inside middle portion installs liquid crystal display screen 16, institute
State liquid crystal display screen 16 back and pcb board 8, described pcb board 8 surrounding suit shading ring 11 are installed.
In sum, owing to have employed technique scheme, the invention has the beneficial effects as follows:
By arranging the second groove and stage portion on housing, stage portion is offered hole clipping, by backlight assembly
Directly buckle is arranged in the second groove, makes backlight assembly fixing also by shell location, it is simple to backlight assembly
On LCD viewing area be directed at more accurately with the LCD window mouth on screen board, have be skillfully constructed, structure
Simply, the features such as transformation is easily and improvement cost is low.
Change makes charging accelerate, and discharges slack-off, and waveform becomes rapid increase and delays from slowly rising rapid decrease
Slow decline so that during buzzer sounding, rises during due to charging and quickly makes sound clearer and more melodious, and electric discharge is slow
Slowly making last or end syllable elongated, sound is softer, and can allow by change resistance size change last or end syllable length.
Anti-surge circuit relates to exquisiteness, runs and maintenance cost is cheap, easy to make, improves production efficiency.
The liquid crystal display screen making automobile instrument gets a promotion on antistatic, thus improves the antistatic behaviour of overall instrument
Energy.The shading ring and the PCB that increase liquid crystal display screen increase Electro-static Driven Comb passage, help external charge quickly to discharge
Outside instrument.So that the antistatic effect that liquid crystal display screen is in automobile instrument gets a promotion.Thus promote instrument
The antistatic calling hierarchy of table.
Automobile instrument integral data presentation device can provide the car speed of user base, revolution, oil temperature etc.
Outside information, additionally it is possible to provide Geomagnetism Information, pressure information and GPS information, it is possible to make user more directly perceived
Connection external information, circuit cost is cheap, and connection configuration is reasonable.
After adding extra sensor so that orthodox car instrument provides more information and function, makes
Driver is obtained in that the real time information of more automobile present position, helps driver to make current state
Judge.
By connecting LED drive circuit, it is achieved the light on and off of N paths of LEDs control, and breach under Legacy Status
Individually control, expend the drawback of components and parts, thus realize MCU by LED drive circuit and be uniformly controlled
LED light on and off.
Solving LCD backlight and the hornbook of automobile instrument, pointer brightness can be carried out with the demand of user
Regulation.User can carry out brightness regulation according to the demand of oneself to instrument backlight.
The additional aspect of the present invention and advantage will part be given in the following description, and part will be retouched from following
Become obvious in stating, or recognized by the practice of the present invention.
Accompanying drawing explanation
Above-mentioned and/or the additional aspect of the present invention and advantage are from combining the accompanying drawings below description to embodiment
Will be apparent from easy to understand, wherein:
Fig. 1 is automobile instrument outer casing and backlight assembly buzzer schematic diagram in prior art；
Fig. 2 is automobile instrument outer casing of the present invention and backlight assembly buzzer schematic diagram；
Fig. 3 is automobile instrument outer casing of the present invention and backlight assembly anti-surge circuit schematic diagram；
Fig. 4 is automobile instrument outer casing of the present invention and backlight assembly anti-static electricity interference device schematic diagram；
Fig. 5 is automobile instrument outer casing of the present invention and backlight assembly anti-static electricity interference device sectional view；
Fig. 6 is automobile instrument outer casing of the present invention and backlight assembly anti-static electricity interference device automobile instrument back shows
It is intended to；
Fig. 7 is automobile instrument outer casing of the present invention and backlight assembly synthetic data display circuit schematic diagram；
Fig. 8 is automobile instrument outer casing of the present invention and backlight assembly synthetic data display circuit schematic diagram；
Fig. 9 is automobile instrument outer casing of the present invention and backlight assembly synthetic data display circuit schematic diagram；
Figure 10 is automobile instrument outer casing of the present invention and backlight assembly extension indicator light circuit schematic diagram；
Figure 11 is automobile instrument outer casing of the present invention and backlight assembly extension indicator light circuit schematic diagram；
Figure 12 is automobile instrument outer casing of the present invention and backlight assembly backlight conditioned circuit schematic diagram；
Figure 13 is backlight assembly schematic diagram in automobile instrument outer casing of the present invention and backlight assembly；
Figure 14 is the body diagram of automobile instrument outer casing of the present invention and backlight assembly；
Figure 15 is the housing schematic perspective view of automobile instrument outer casing of the present invention and backlight assembly.
Detailed description of the invention
Embodiments of the invention are described below in detail, and the example of described embodiment is shown in the drawings, wherein certainly
Begin to same or similar label eventually represent same or similar element or there is the unit of same or like function
Part.The embodiment described below with reference to accompanying drawing is exemplary, is only used for explaining the present invention, and can not
It is interpreted as limitation of the present invention.
As shown in Figure 13,14,15, the invention provides a kind of automobile instrument outer casing and backlight assembly, bag
Include the housing 1 of strip, described housing 1 be connected with below two be symmetrically arranged lower solid
Determine journal stirrup 6, have the first hole, location 6a and the first via 6b on journal stirrup 6 the most side by side often once fixing,
Wherein the first location hole 6a is positioned at the inner of lower fixing journal stirrup 6, is provided with two circles on housing 1 the most side by side
First groove 2 of shape, it it is critical only that: second that the middle part concave shape forward of described housing 1 is rectangular is recessed
The stage portion 5 of groove 4 and strip, described second groove 4 and stage portion 5 be positioned at two the first grooves 2 it
Between, wherein symmetrical the right and left being distributed in the second groove 4 of stage portion 5, the bottom surface ratio of stage portion 5
The bottom surface of the second groove 4 is high, all has hole clipping 5a of upper and lower two rectangles in each described stage portion 5；
Being provided with the backlight assembly 7 of rectangle in described second groove 4, the right and left of described backlight assembly 7 is equal
Connecting and have and hole clipping 5a buckle 7a one to one, described buckle 7a buckles in corresponding hole clipping 5a；
Also having the light-conductive hole 3 of M rectangle on described housing 1, described light-conductive hole 3 is arranged side by side in
The top of the second groove 4, described M is positive integer；
Described backlight assembly 7 includes: anti-surge circuit, buzzer drive circuit, synthetic data display circuit,
Backlight conditioned circuit, extension drive circuit of indicator and anti static device, CPU, wherein on backlight assembly
Related circuit is arranged on pcb board, and its arrangement is well known to those skilled in the art.
Anti-surge circuit outfan connects cpu power input, the input of buzzer drive circuit power supply respectively
End, synthetic data display circuit power input, backlight conditioned circuit power input and extension display lamp drive
Galvanic electricity road power input, described synthetic data display circuit signal output part connects backlight conditioned circuit signal
Input, it is defeated that described synthetic data display circuit buzzer signal outfan connects buzzer drive circuit signal
Entering end, described synthetic data display circuit display lamp signal output part connects extension indicator light circuit signal input
End, described extension drive circuit of indicator signal output part connects backlight conditioned circuit signal input part,
The invention provides a kind of automobile instrument outer casing and backlight assembly, including buzzer drive circuit,
Buzzer, the first diode, the 3rd resistance, the second electric capacity, transistor seconds, the 4th transistor,
Buzzer one end connects the first diode cathode, the described buzzer other end is just connecting the first diode
Pole, described first diode cathode is also connected with the 3rd resistance one end, and described first diode cathode is also connected with
The three resistance other ends, described 3rd resistance one end connects second electric capacity one end, and the described 3rd resistance other end is even
Connecing the second electric capacity other end, described first diode cathode connects the 4th transistor source, described one or two pole
Pipe negative pole connects transistor seconds grid.
Described buzzer drive circuit, it is preferred that also include: the first transistor and the first resistance,
Described the first transistor source electrode connects first resistance one end and automobile instrument signal synthesis data display electricity
Road buzzer signal input, described first crystal tube grid connects transistor seconds drain electrode, described first electricity
The resistance other end connects the first transistor drain electrode.
Described buzzer drives control circuit, it is preferred that also include: the second resistance and the first electric capacity,
Described second resistance one end connects first electric capacity one end, and the described second resistance other end connects the first electric capacity
Ground connection after the other end, described second resistance one end is also connected with first crystal tube grid.
Described buzzer drive control circuit, it is preferred that also include: the 4th resistance, the 5th resistance, the 6th
Resistance, the 3rd electric capacity, third transistor,
3rd electric capacity one end connects automobile instrument anti-surge circuit power input and the 4th resistance one end respectively,
The described 4th resistance other end connects the 5th resistance one end and third transistor drain electrode, described third transistor source
Pole connects the 6th resistance one end, and the described 6th resistance other end connects the first transistor drain electrode, described 5th electricity
The resistance other end connects the 3rd electric capacity other end, after the described 5th electric capacity other end is also connected with third transistor grid
Ground connection.
Described buzzer drives control circuit, it is preferred that also include: the 4th transistor, the 7th resistance, the
Eight resistance, the 4th electric capacity,
Described 4th transistor source connects the first diode cathode, described 4th transistor gate ground connection, institute
State the 4th transistor drain and connect the 7th resistance one end and the 8th resistance one end, another termination of described 7th resistance
Ground, the described 8th resistance other end connects the 4th electric capacity one end, described 4th electric capacity other end ground connection.
Described ring device drives control circuit, it is preferred that also include: described 3rd resistance is adjustable resistance.
The change that Fig. 2 does on the basis of available circuit Fig. 1, this change makes charging accelerate, and electric discharge becomes
Slowly, waveform becomes rapid increase and slowly declines from slowly rising rapid decrease so that during buzzer sounding, by
Rising when charging quickly makes sound clearer and more melodious, and electric discharge slowly makes last or end syllable elongated, and sound is softer,
And can allow by change resistance size change last or end syllable length.
As it is shown on figure 3, the invention provides a kind of automobile instrument outer casing and backlight assembly, wherein Anti-surging electricity
Road, it is it is critical that include: the 4th diode, the second diode, the 6th electric capacity, the 9th electric capacity and
One IC chip,
4th diode cathode connects peripheral hardware, and described 4th diode cathode connects the second diode cathode, institute
Stating the second diode cathode and connect the 6th electric capacity one end, the described 6th electric capacity other end connects an IC chip
Input, a described IC chip output connects the 9th electric capacity other end described in the 9th electric capacity one end and connects
Oneth IC chip resets and postpones end.
Having the beneficial effect that by the second diode and the 4th diode mating reaction, guarantor of technique scheme
Card automobile instrument steady operation, prevents the surge voltage injury to automobile instrument.
Described anti-surge circuit, it is preferred that also include the 3rd booster diode D3, described 3rd auxiliary two
Pole pipe positive pole connects the second diode cathode, and described 3rd booster diode negative pole connects the second diode and bears
Pole.
Technique scheme have the beneficial effect that the 3rd booster diode play auxiliary the second diode prevent
The protective effect of surge.
Described anti-surge circuit, it is preferred that also include that the 7th electric capacity, described 7th electric capacity one end connect first
IC chip input, described 7th electric capacity other end ground connection.
Described anti-surge circuit, it is preferred that also include that the 8th electric capacity, described 8th electric capacity one end connect IC
Chip resets and postpones end, and the described 8th electric capacity other end connects the 9th electric capacity other end.
Described anti-surge circuit, it is preferred that also include that the 5th electric capacity, described 5th electric capacity one end connect first
IC chip output and automobile instrument peripheral hardware end, the described 5th electric capacity other end connects the 9th electric capacity other end
With automobile instrument peripheral hardware end.
Described anti-surge circuit, it is preferred that described second diode is ST70-27MF.
Technique scheme have the beneficial effect that anti-surge circuit low cost, stable performance.
Described anti-surge circuit, it is preferred that described 3rd booster diode is TPC27A.
Described anti-surge circuit, it is preferred that described IC chip is TLE4275.
In sum, owing to have employed technique scheme, the invention has the beneficial effects as follows:
Anti-surge circuit relates to exquisiteness, runs and maintenance cost is cheap, easy to make, improves production efficiency.
As shown in Figure 4, the invention provides the antistatic protection dress of a kind of automobile instrument outer casing and backlight assembly
Put, including: shading ring 11, liquid crystal display screen winding displacement connect pin 12, automobile instrument earth terminal 13, wire 14,
Outside port 15, magnetic bead 10,
Shading ring 11 is looped around the pcb board surrounding of automobile instrument pcb board 16, described automobile instrument PCB
Plate 16 winding displacement is connected to liquid crystal display screen winding displacement and connects on pin 12, produced by automobile instrument pcb board 16 winding displacement
Electric charge is shielded by shading ring 11, and described shading ring 1 connects automobile instrument earth terminal 13, described outside
Port 15 connects automobile instrument earth terminal 13, described shading ring 11 and automobile instrument ground connection by wire 14
End 13 connects the release carrying out electric charge by magnetic bead 10.
As it is shown in figure 5, described antistatic protection device, it is preferred that also include single line pin 17,
Single line pin 17 one end connects automobile instrument earth terminal 13, and described single line pin 17 other end passes through metal
Clamping part held tight shading ring 11.
As shown in Figure 6, described antistatic protection device, it is preferred that also include: sealing ring 9,
Sealing described sealing ring 9 along automobile instrument surrounding, automobile instrument inside middle portion installs automobile instrument PCB
Plate 6, pcb board 8, described pcb board 8 surrounding suit shading ring 11 are installed in described automobile instrument back.
Wherein sealing ring is not only able to stop external dust, additionally it is possible to prevent liquid from flowing into the problem causing short circuit.
1, on liquid crystal display screen, shading ring is increased；
2, on automobile instrument main PCB, liquid crystal display screen implementation is encircled, and discharged by single-point grounding mode
Outside electric charge.
3, external charge delivery mode passes through one-point system.
As it is shown in fig. 7, the synthetic data that the invention provides a kind of automobile instrument outer casing and backlight assembly shows
Circuit is, including: geomagnetic sensor, baroceptor, GPS module, CPU,
Geomagnetic sensor signal output part connects CPU Geomagnetic signal input, described baroceptor signal
Outfan connects CPU air pressure signal input, and described GPS module signal output part connects the GPS of CPU
Signal input part, LCD display device data signal input connects cpu data signal output part.
Preferably, described geomagnetic sensor and baroceptor include:
Geomagnetic sensor and baroceptor pass through I2C communication bus is attached with CPU.
Described synthetic data display circuit, it is preferred that described GPS module includes:
Described GPS module is attached with CPU by serial communication bus.
As shown in Figure 8, it is preferred that described geomagnetic sensor also includes: the 15th electric capacity, the 14th electric capacity,
10th electric capacity, the 11st electric capacity, the 36th electric capacity, the 11st resistance；
Described 15th electric capacity, the 14th electric capacity and the 36th electric capacity parallel connection one end connect geomagnetic sensor power supply and supply
Electricity end and interface power feeder ear, described 15th electric capacity, the 14th electric capacity and the 36th electric capacity parallel connection other end
Ground connection, described geomagnetic sensor magnetic reset cap end connects the 10th electric capacity one end, the described 10th electric capacity other end
Ground connection, the 11st resistance one end connects geomagnetic sensor and resets end, described 11st resistance other end ground connection, institute
State geomagnetic sensor internal voltage regulator output shunt capacitance connect end connect the 11st electric capacity one end, the described 11st
Electric capacity other end ground connection.
As shown in Figure 8, it is preferred that described baroceptor also includes: the 24th resistance, the 25th resistance,
12nd electric capacity, the 13rd resistance, the 37th electric capacity；
Described 24th resistance one end connects power voltage supply end, and the described 24th resistance other end connects air pressure sensing
Device I2C sequential clock end, described 25th resistance one end connect power voltage supply end, described 25th resistance another
End connects baroceptor I2C sequence data end, described 12nd electric capacity, the 13rd electric capacity, the 37th electric capacity
One end in parallel connects power voltage supply end and baroceptor feeder ear, described 12nd electric capacity, the 13rd electric capacity,
37th electric capacity parallel connection other end ground connection.
As it is shown in figure 9, described automobile instrument integral data presentation device, it is preferred that described GPS mould
Block includes: the 16th resistance, the 17th resistance, the 33rd resistance, the 38th electric capacity, the 1st inductance；
Described 16th resistance one end connects automobile instrument Master Control Unit, and the described 16th resistance other end connects
GPS module data transmission terminal, described 17th resistance one end connection automobile instrument Master Control Unit, the described 17th
The resistance other end connects data transmission terminal, and described 38th electric capacity one end connects the 33rd resistance one end and the 1st
Inductance one end, described 38th the electric capacity other end connect GPS module earth terminal, described 33rd resistance another
End connects power voltage supply end.
Preferably, described CPU is MKL25Z128VFT4.
Preferably, described geomagnetic sensor is FXOS8700.
Preferably, described baroceptor is MPL3115A2.
Described automobile instrument integral data presentation device, it is preferred that described GPS module is MAX-7C.
Heretofore described automobile instrument is except using the main control chip of conventional instrument, various sample circuit and letter
Outside breath display circuit, the function moulds such as GPS module, geomagnetic sensor, baroceptor are it is possible to additionally incorporate
Block, the various sample circuits that instrument has still realize the function of traditional external information input main control chip,
And information display circuit significantly rolls over vehicle condition display function, main control chip is except controlling sample circuit and showing
Show circuit, also by read the information of each module that newly increases to obtain the current GPS information of automobile,
Geomagnetism Information and the atmospheric pressure information of automobile position are shown to user.
CPU is ATMEGA16L.
The invention have the benefit that after adding extra sensor so that orthodox car instrument provides
More information and function, make driver be obtained in that the real time information of more automobile present position, helps
Current state is judged by driver.
As shown in Figure 10, the invention provides a kind of automobile instrument outer casing and backlight assembly, wherein New LED
Extension indicator light circuit is, including: power-supplying circuit, a MCU, LED drive circuit,
Described power-supplying circuit power output end connects a MCU feeder ear respectively and LED drives electricity
Road power input, described LED drive circuit outfan connects N number of LED alarm lamp, and described N is
Positive integer.
Preferably, described LED drive circuit is two LED drive circuits in parallel, the LED after parallel connection
Drive circuit signal input part connects a MCU signal output part, the LED drive circuit after parallel connection
Open drain output connects N number of LED alarm lamp.
As shown in figure 11, it is preferred that described LED drive circuit is TLC6C5912.
Preferably, also include that the 111st resistance, described 111st resistance one end connect the electricity of power-supplying circuit
Source input, the described 111st resistance other end connects LED drive circuit power input.
Preferably, described LED alarm lamp positive pole connects power supply circuits, and described LED alarm lamp negative pole connects
LED drive circuit signal output part.
The invention has the beneficial effects as follows:
By connecting LED drive circuit, it is achieved the light on and off of N paths of LEDs control, and breach under Legacy Status
Individually control, expend the drawback of components and parts, thus it is unified to realize a MCU by LED drive circuit
Control LED light on and off.LED drive circuit is TLC6C5912.Solving can at automotive ignition moment LED
The phenomenon of flicker can occur.
Oneth MCU controls LED by a kind of serial shift communication modes and drives IC internal logic mould
Block, the logic level that internal logic circuit sends according to a MCU carries out light on and off to 24 paths of LEDs
Controlling, realize LED warning instruction, wherein MCU control LED light on and off belong to this area
Customary means.
As shown in figure 12, automobile instrument outer casing of the present invention and backlight assembly brightness conditioned circuit, its key exists
In, including: the 9th resistance, the tenth resistance, the 2nd MCU, the 13rd resistance, the 14th resistance, drive
Galvanic electricity road, the 5th transistor, hornbook backlight circuit, pointer backlight circuit, LCD lamp,
9th resistance one end connects adjustable pwm pulse signal end, and the described 9th resistance other end connects
Tenth resistance one end, the described tenth resistance other end connects the 2nd MCU pulse signal input terminal, and described the
Two MCU hornbook backlight signal outfans connect the 13rd resistance one end, the described 13rd resistance other end
Connecting the 14th resistance one end and the 5th transistor drain respectively, the described 14th resistance other end connects the 5th
Transistor gate, described 5th transistor source connects hornbook backlight circuit, described 2nd MCU pointer
Backlight signal outfan connects drive circuit input, and described drive circuit outfan connects LCD lamp respectively
With pointer backlight circuit.
Hornbook backlight and pointer are carried on the back by having the beneficial effect that of technique scheme by pwm pulse signal
Light is adjusted.
Described hornbook backlight circuit includes: the 18th resistance, the 19th resistance, the 20th resistance, the 6th
Light emitting diode, the 7th light emitting diode,
18th resistance one end connects the first transistor source electrode, and the described 18th resistance other end connects the respectively
Six light emitting diode negative poles and the 19th resistance one end, it is luminous that described 6th light emitting diode positive pole connects the 7th
Diode cathode and the 19th resistance other end, the described 19th resistance other end is also connected with the 20th resistance one
End, the described 20th resistance other end connects the 7th light emitting diode positive pole, and described 7th light emitting diode is just
Pole connects power end.
Technique scheme have the beneficial effect that hornbook backlight circuit is reasonable in design, circuit working stability.
Described pointer backlight circuit includes: the 15th resistance, the 21st resistance, the 22nd resistance,
Eight light emitting diodes, the 9th light emitting diode,
Described 15th resistance one end connects drive circuit signal output part, and the described 15th resistance other end is even
Connecing the 8th light emitting diode negative pole and the 21st resistance one end, described 8th light emitting diode positive pole connects respectively
Connecing the 9th light emitting diode negative pole and the 21st resistance other end, the described 21st resistance other end also connects
Connecing the 22nd resistance one end, the described 22nd resistance other end connects the 9th light emitting diode positive pole, institute
State the 9th light emitting diode positive pole and be also connected with power end.
Technique scheme have the beneficial effect that pointer backlight circuit is reasonable in design, circuit working stability.
Preferably, described drive circuit is ULQ2003A.
Instrumentation tap gathers the PWM dim signal of low frequency, carries out dividing potential drop to being suitable for second by two resistance
The voltage signal that MCU gathers, then the 2nd MCU is changed by the voltage signal gathered, output
The most amplified device of pwm signal of three tunnel independences carries out hornbook, pointer, LCD backlight brightness regulation
Control.An input small capacitances in parallel, constitutes a RC low pass filter, the height beyond rejection frequency
Frequently noise signal, the algorithm making the 2nd MCU need not open self is filtered, and alleviates burden；Input
End adds a stabilivolt, provides stable collection signal to single-chip microcomputer, will not be subject to disturbing of extraneous voltage pulsation,
Protect the I/O port of the 2nd MCU not by excessive pressure damages.
Solving LCD backlight and the hornbook of automobile instrument, pointer brightness can be carried out with the demand of user
Regulation.User can carry out brightness regulation according to the demand of oneself to automobile instrument backlight.
Figure 13 is backlight assembly general illustration of the present invention.Including: anti-surge circuit, buzzer drive
Galvanic electricity road, synthetic data display circuit, backlight conditioned circuit, extension indicator light circuit and anti static device,
Anti-surge circuit outfan connects buzzer drive circuit power input, synthetic data display electricity respectively
Road power input and extension indicator light circuit power input, described synthetic data display circuit signal exports
End connects backlight conditioned circuit signal input part, and described synthetic data display circuit buzzer signal outfan is even
Connecing buzzer drive circuit signal input part, described synthetic data display circuit display lamp signal output part connects
Extension indicator light circuit signal input part, described extension indicator light circuit signal output part connects backlight adjustable electric
Road signal input part,
Described anti-surge circuit, buzzer drive circuit, synthetic data display circuit, backlight conditioned circuit,
Extension indicator light circuit is arranged on the pcb board at automobile instrument back, around anti-around pcb board winding displacement
Electrostatic equipment, is used for preventing electromagnetic interference.
Such as Figure 14, shown in 15, described automobile instrument outer casing and backlight assembly, it is preferred that in each institute
Being equipped with limiting section 5b in stating hole clipping 5a, it is recessed towards second that described limiting section 5b is integrally attached to hole clipping 5a
The middle part on one side of groove 4.
Described automobile instrument outer casing and backlight assembly, it is preferred that set in the middle part of the bottom surface of described second groove 4
There are four stud 4a of matrix distribution, are provided with and stud 4a one_to_one corresponding at the back side of described backlight assembly 7
Depressed part, described stud 4a stretches in respective recesses portion.
Although an embodiment of the present invention has been shown and described, those of ordinary skill in the art can manage
Solve: these embodiments can be carried out in the case of without departing from the principle of the present invention and objective multiple change,
Amendment, replacement and modification, the scope of the present invention is limited by claim and equivalent thereof.
Claims (9)
- null1. an automobile instrument outer casing and backlight assembly，Housing (1) including strip，Two lower fixing journal stirrups (6) being symmetrically arranged it are connected with below at described housing (1)，The first hole, location (6a) and the first via (6b) is had on journal stirrup (6) the most side by side often once fixing，Wherein the first hole, location (6a) is positioned at the inner of lower fixing journal stirrup (6)，Housing (1) is provided with two circular the first grooves (2) the most side by side，It is characterized in that: the second groove (4) that the middle part concave shape forward of described housing (1) is rectangular and the stage portion (5) of strip，Described second groove (4) and stage portion (5) are positioned between two the first grooves (2)，Wherein symmetrical the right and left being distributed in the second groove (4) of stage portion (5)，The bottom surface of stage portion (5) is higher than the bottom surface of the second groove (4)，Each described stage portion (5) all has the hole clipping (5a) of upper and lower two rectangles；The backlight assembly (7) of rectangle is installed in described second groove (4), the right and left of described backlight assembly (7) is respectively connected with and hole clipping (5a) buckle one to one (7a), and described buckle (7a) buckles in corresponding hole clipping (5a)；Also having the light-conductive hole (3) of M rectangle on described housing (1), described light-conductive hole (3) is arranged side by side in the top of the second groove (4), and described M is positive integer；Described backlight assembly (7) including: anti-surge circuit, buzzer drive circuit, synthetic data display circuit, backlight conditioned circuit, extension drive circuit of indicator and anti static device, CPU,Anti-surge circuit outfan connects cpu power input respectively, buzzer drive circuit power input, synthetic data display circuit power input, backlight conditioned circuit power input and extension drive circuit of indicator power input, described synthetic data display circuit signal output part connects backlight conditioned circuit signal input part, described synthetic data display circuit buzzer signal outfan connects buzzer drive circuit signal input part, described synthetic data display circuit display lamp signal output part connects extension drive circuit of indicator signal input part, described extension drive circuit of indicator signal output part connects backlight conditioned circuit signal input part,Around anti static device around automobile instrument backlight assembly (7) pcb board winding displacement, it is used for preventing electromagnetic interference；Anti-surge circuit includes: the 4th diode, the second diode, the 6th electric capacity, the 9th electric capacity and an IC chip,4th diode cathode connects buzzer drive circuit power input, synthetic data display circuit power input, backlight conditioned circuit power input, extension drive circuit of indicator power input and cpu power input, described 4th diode cathode connects the second diode cathode, described second diode cathode connects the 6th electric capacity one end, the described 6th electric capacity other end connects an IC chip input, a described IC chip output connects the 9th electric capacity one end, and the described 9th electric capacity other end connects an IC chip and resets delay end；Buzzer drive circuit includes: buzzer, the first diode, the 3rd resistance, the second electric capacity, transistor seconds, the 4th transistor,Buzzer one end connects the first diode cathode, the described buzzer other end connects the first diode cathode, described first diode cathode is also connected with the 3rd resistance one end, described first diode cathode is also connected with the 3rd resistance other end, described 3rd resistance one end connects second electric capacity one end, the described 3rd resistance other end connects the second electric capacity other end, described first diode cathode connects the 4th transistor source, and described first diode cathode connects transistor seconds grid；Synthetic data display device includes: geomagnetic sensor, baroceptor, GPS module,Geomagnetic sensor signal output part connects the Geomagnetic signal input of CPU, described baroceptor signal output part connects the air pressure signal input of CPU, described GPS module signal output part connects the gps signal input of CPU, LCD display device data signal input connects the data signal output of CPU, and geomagnetic sensor and baroceptor pass through I2C communication bus is attached with CPU；Extension drive circuit of indicator includes: power-supplying circuit, a MCU, LED drive circuit,Described anti-surge circuit power output end connects a MCU feeder ear and LED drive circuit power input respectively, and described LED drive circuit outfan connects N number of LED alarm lamp, and described N is positive integer, and LED alarm lamp is placed in light-conductive hole (3) place；Backlight conditioned circuit includes: the 9th resistance, the tenth resistance, the 2nd MCU, the 13rd resistance, the 14th resistance, drive circuit, the 5th transistor, hornbook backlight circuit, pointer backlight circuit, LCD lamp,9th resistance one end connects adjustable pwm pulse signal end, the described 9th resistance other end connects the tenth resistance one end, the described tenth resistance other end connects the 2nd MCU pulse signal input terminal, described 2nd MCU hornbook backlight signal outfan connects the 13rd resistance one end, the described 13rd resistance other end connects the 14th resistance one end and the 5th transistor drain respectively, the described 14th resistance other end connects the 5th transistor gate, described 5th transistor source connects hornbook backlight circuit, described 2nd MCU pointer backlight signal outfan connects drive circuit input, described drive circuit outfan connects LCD lamp and pointer backlight circuit respectively；Pcb board (8) anti static device of automobile instrument backlight assembly includes: shading ring (11), liquid crystal display screen winding displacement connect pin (12), automobile instrument earth terminal (13), wire (14), outside port (15), magnetic bead (10)；Shading ring (11) is looped around described pcb board (8) surrounding, described pcb board (8) winding displacement is connected to liquid crystal display screen winding displacement and connects on pin (12), produced by described pcb board (8) winding displacement, electric charge is shielded by shading ring (11), described shading ring (11) connects automobile instrument earth terminal (13), described outside port (15) connects automobile instrument earth terminal (13) by wire (14), and described shading ring (11) passes through magnetic bead (10) and is connected the release carrying out electric charge with automobile instrument earth terminal (13).
- Automobile instrument outer casing the most according to claim 1 and backlight assembly, it is characterized in that, described anti-surge circuit also includes the 3rd booster diode (D3), described 3rd booster diode positive pole connects the second diode cathode, and described 3rd booster diode negative pole connects the second diode cathode.
- Automobile instrument outer casing the most according to claim 1 and backlight assembly, it is characterised in that described geomagnetic sensor also includes: the 15th electric capacity, the 14th electric capacity, the 10th electric capacity, the 11st electric capacity, the 36th electric capacity, the 11st resistance；Described 15th electric capacity, the 14th electric capacity and the 36th electric capacity parallel connection one end connect geomagnetic sensor power supply side and interface power feeder ear, described 15th electric capacity, the 14th electric capacity and the 36th electric capacity parallel connection other end ground connection, described geomagnetic sensor magnetic reset cap end connects the 10th electric capacity one end, described 10th electric capacity other end ground connection, 11st resistance one end connects geomagnetic sensor and resets end, described 11st resistance other end ground connection, described geomagnetic sensor internal voltage regulator output shunt capacitance connects end and connects the 11st electric capacity one end, described 11st electric capacity other end ground connection.
- Automobile instrument outer casing the most according to claim 1 and backlight assembly, it is characterised in that described buzzer drive circuit also includes: the 4th resistance, the 5th resistance, the 6th resistance, the 3rd electric capacity, third transistor,3rd electric capacity one end connects automobile instrument anti-surge circuit power input and the 4th resistance one end respectively, the described 4th resistance other end connects the 5th resistance one end and third transistor drain electrode, described third transistor source electrode connects the 6th resistance one end, the described 6th resistance other end connects the first transistor drain electrode, the described 5th resistance other end connects the 3rd electric capacity other end, and the described 5th resistance other end is also connected with ground connection after third transistor grid.
- Automobile instrument outer casing the most according to claim 1 and backlight assembly, it is characterised in that described baroceptor also includes: the 24th resistance, the 25th resistance, the 12nd electric capacity, the 13rd electric capacity, the 37th electric capacity；Described 24th resistance one end connects power voltage supply end, and the described 24th resistance other end connects baroceptor I2C sequential clock end, described 25th resistance one end connects power voltage supply end, and the described 25th resistance other end connects baroceptor I2C sequence data end, described 12nd electric capacity, the 13rd electric capacity, the 37th electric capacity parallel connection one end connect power voltage supply end and baroceptor feeder ear, described 12nd electric capacity, the 13rd electric capacity, the 37th electric capacity parallel connection other end ground connection.
- Automobile instrument outer casing the most according to claim 1 and backlight assembly, it is characterised in that described hornbook backlight circuit includes: the 18th resistance, the 19th resistance, the 20th resistance, the 6th light emitting diode, the 7th light emitting diode,18th resistance one end connects the first transistor source electrode, the described 18th resistance other end connects the 6th light emitting diode negative pole and the 19th resistance one end respectively, described 6th light emitting diode positive pole connects the 7th light emitting diode negative pole and the 19th resistance other end, the described 19th resistance other end is also connected with the 20th resistance one end, the described 20th resistance other end connects the 7th light emitting diode positive pole, and described 7th light emitting diode positive pole connects power end.
- Automobile instrument outer casing the most according to claim 1 and backlight assembly, it is characterised in that described pointer backlight circuit includes: the 15th resistance, the 21st resistance, the 22nd resistance, the 8th light emitting diode, the 9th light emitting diode,Described 15th resistance one end connects drive circuit signal output part, the described 15th resistance other end connects the 8th light emitting diode negative pole and the 21st resistance one end, described 8th light emitting diode positive pole connects the 9th light emitting diode negative pole and the 21st resistance other end respectively, the described 21st resistance other end is also connected with the 22nd resistance one end, the described 22nd resistance other end connects the 9th light emitting diode positive pole, and described 9th light emitting diode positive pole is also connected with power end.
- Automobile instrument outer casing the most according to claim 1 and backlight assembly, it is characterised in that described anti static device also includes single line pin (17),Single line pin (17) one end connects automobile instrument earth terminal (13), and described single line pin (17) other end passes through metallic clip held tight shading ring (11).
- Automobile instrument outer casing the most according to claim 1 and backlight assembly, it is characterised in that described anti static device also includes: sealing ring (9),Described sealing ring (9) is sealed along automobile instrument surrounding, automobile instrument inside middle portion installs liquid crystal display screen (16), pcb board (8), described pcb board (8) surrounding suit shading ring (11) are installed in described liquid crystal display screen (16) back.
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| DE102016005255B4 (en) * | 2016-04-29 | 2023-01-26 | Mercedes-Benz Group AG | Device and method for controlling interior lighting of a vehicle |
| CN110435565B (en) * | 2019-07-02 | 2020-09-25 | 未来汽车科技（深圳）有限公司 | Power supply control circuit and method for automobile instrument, automobile instrument and automobile |
| CN113242639B (en) * | 2021-04-22 | 2024-04-26 | 东风电驱动系统有限公司 | Soft and hard dual-control and mutual isolation protection circuit of automobile instrument alarm lamp and working method |
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