CN108569212A - A kind of fault diagnosis reponse system of automobile LED car light - Google Patents
A kind of fault diagnosis reponse system of automobile LED car light Download PDFInfo
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- CN108569212A CN108569212A CN201711024124.3A CN201711024124A CN108569212A CN 108569212 A CN108569212 A CN 108569212A CN 201711024124 A CN201711024124 A CN 201711024124A CN 108569212 A CN108569212 A CN 108569212A
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- 238000003745 diagnosis Methods 0.000 title claims abstract description 49
- 238000005070 sampling Methods 0.000 claims abstract description 12
- 230000015556 catabolic process Effects 0.000 claims abstract description 5
- 239000003381 stabilizer Substances 0.000 claims description 6
- 239000013078 crystal Substances 0.000 claims description 3
- 230000005611 electricity Effects 0.000 description 5
- 238000012544 monitoring process Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 241001465382 Physalis alkekengi Species 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
- B60Q11/00—Arrangement of monitoring devices for devices provided for in groups B60Q1/00 - B60Q9/00
- B60Q11/005—Arrangement of monitoring devices for devices provided for in groups B60Q1/00 - B60Q9/00 for lighting devices, e.g. indicating if lamps are burning or not
Abstract
The present invention provides a kind of fault diagnosis reponse system of automobile LED car light, including drive module, sampling module, diagnostic module, feedback module, and the drive module is linear or constant-current transistor formula driving circuit drives LED light by resistance-type；Low side LED light voltage in the sampling module acquisition LED strings, inputs to rear pole diagnostic module after voltage signal is scaled；The diagnostic module carries out breakdown judge to the LED voltage detected, and fault diagnosis signal is passed to feedback module；Feedback module sends out feedback signal to drive module according to fault diagnosis signal and exports fault-signal, and drive module carries out the power-off control that is powered to LED light.A small amount of LED that singly gone here and there in being driven present invention accomplishes current automobile LED drives and the requirement of diagnostic function, not only at low cost but also cost-effective.
Description
Technical field
The present invention relates to automotive electronics applied technical fields, and in particular to a kind of fault diagnosis feedback of automobile LED car light
System.
Background technology
In recent years, as automotive grade LED cost reductions, light efficiency improve, the lamps and lanterns of automobile main frame maker start more and more
Replace traditional bulb source scheme using LED light source scheme.And due to the characteristic of semiconductor that LED has, the drive needed
Flowing mode is increasingly complex compared with traditional scheme.In current automotive electronics test, power source supplying voltage 9-16V, single LED voltage
It is general that general driving scheme, and included fault diagnosis functions are done using driving chip driving switch circuit in 2-3V or so.But
It is gone here and there in some special lists in a small amount of LED schemes, the cost is relatively high for this scheme, and electronic test risk is big, cost performance
It is low.
Patent 201510502661.9 discloses a kind of the control circuit system and detection method of auto trailer lamps and lanterns, packet
Turning indicator control, braking light switch, main vehicle steering indicating light, trailer steering indicating light, main vehicle Brake lamp, trailer braking protection valve lamp, vehicle body control are included
Device and instrument controller processed；Main vehicle steering indicating light, trailer steering indicating light, main vehicle Brake lamp and trailer braking protection valve lamp are the same as the defeated of driving circuit
Outlet connects；In car body controller at least provided with micro-control unit and driving circuit.Patent 201310581003.4, discloses
A kind of dual-function LED drive circuit, including protection circuit module, power module, pwm signal generation module, current regulating module,
Fault diagnosis module and LED light, the protection circuit module, power module, pwm signal generation module, current regulating module according to
Secondary electrical connection, it is described protection circuit module output end and current regulating module output end be separately connected LED light anode and
Cathode, the fault diagnosis module input terminal is connect with LED light cathode, output end connects pwm signal generation module.Above-mentioned patent
The size of terminal voltage is acquired to distinguish loadtype with micro-control unit by the diagnosis in car body controller, and load is carried out
Fault diagnosis；It realizes and leads to the light that a string of LED light send out two kinds of different brightness, LED light source quantity on vehicle body can be effectively reduced, increased
The space availability ratio of extra bus body.Corresponding technical solution is not provided for the fault diagnosis of LED car lamp.
Invention content
(1) the technical issues of solving
The present invention in order to overcome the defect problem of a small amount of LED car lamp fault diagnosis of above-mentioned prior art list string, the present invention
A kind of fault diagnosis reponse system of automobile LED car light is provided, meets and singly goes here and there a small amount of LED drivings in the driving of current automobile LED
And the requirement of diagnostic function, it is not only at low cost but also cost-effective.
(2) technical solution
In order to achieve the above object, the present invention is achieved by the following technical programs：
A kind of fault diagnosis reponse system of automobile LED car light, including drive module, sampling module, diagnostic module, feedback
Module, the drive module are linear or constant-current transistor formula driving circuit drives LED light by resistance-type；The sampling module is adopted
Collect low side LED light voltage in LED strings, rear pole diagnostic module is inputed to after voltage signal is scaled；The diagnostic module is to detection
The LED voltage arrived carries out breakdown judge, and fault diagnosis signal is passed to feedback module；Feedback module is believed according to fault diagnosis
Number feedback signal being sent out to drive module and exports fault-signal, drive module carries out the power-off control that is powered to LED light.
Further, the drive module includes resistance R1, R2, transistor Q1, Q2, voltage-stabiliser tube ZD1, LED light LT1,
LT2, LT3, input voltage Vi, the input voltage Vi are connected by resistance R1 with the collector of transistor Q1, input voltage Vi
Also it is connected with the anode of LT1；The cathode of the LT1 is connected with the anode of LT2, and the cathode of the LT2 is connected with the anode of LT3,
The cathode of the LT3 is connected with the collector of transistor Q2；The base stage of the transistor Q2 is connected with the collector of transistor Q1,
The emitter of transistor Q2 is grounded by resistance R2；The emitter of the transistor Q1 is grounded, the base stage and feedback of transistor Q1
Module sends out feedback signal according to fault diagnosis signal and is connected；The voltage-stabiliser tube ZD1 is connected in parallel on the collector and hair of transistor Q1
Between emitter-base bandgap grading.
Further, described transistor Q1, Q2 are NPN type triode.
Further, the sampling module includes three terminal regulator 7805, resistance R3, R4, R5, R6, operational amplifier U1,
The input terminal of the three terminal regulator is connected with input voltage Vi, three terminal regulator output+5V voltages；The operational amplifier U1
Inverting input be connected with the cathode of LT2 by resistance R3, the inverting input of operational amplifier U1 is also connect by resistance R5
The in-phase input end on ground, operational amplifier U1 is connected by resistance R4 with the cathode of LT3, calculates the in-phase input end of amplifier U1 also
It is grounded by resistance R6, the output end of operational amplifier U1 is connected with fault diagnosis module.
Further, the power end of the operational amplifier U1 is connected with the output end of three terminal regulator 7805, and operation is put
The ground terminal of big device U1 is connected to the ground.
Further, the fault diagnosis module includes operational amplifier U2, U3, resistance R7, R8, R9, R10, R11,
R12, diode D1, D2, the in-phase input end of the operational amplifier U2, the inverting input of operational amplifier U3 and operation are put
The output end of big device U1 is connected；The inverting input of operational amplifier U2 passes through resistance R7 and 7805 output end phase of three terminal regulator
Even, the inverting input of operational amplifier U2 is also grounded by resistance R8；The in-phase input end of operational amplifier U3 passes through resistance
R9 is connected with 7805 output end of three terminal regulator, and the in-phase input end of operational amplifier U3 is also grounded by resistance R10；Operation is put
The output end of big device U2 is connected by resistance R12 with 7805 output ends by the output end of resistance R11, operational amplifier U3, is transported
The output end for calculating amplifier U2 passes through diode D2 and feedback module phase by the output end of diode D1, operational amplifier U3
Even.
Further, the power end of described operational amplifier U2, U3 are connected with the output end of three terminal regulator 7805, operation
The ground terminal of amplifier U2, U3 are connected to the ground.
Further, the feedback module includes resistance R13, R14, R15, transistor Q3, output signal Vo, the crystal
The base stage of pipe Q3 is connected by resistance R13 with the cathode of diode D1, D2, and the collector of transistor Q3 passes through resistance R14 and three
7805 output end of voltage-stablizer is held to be connected, the emitter of transistor Q3 is grounded by resistance R15, has feedback signal to pass through transistor Q3
Base stage be connected with the base stage of transistor Q1, output signal Vo is connected with the collector of transistor Q3.
Further, the transistor Q3 is NPN type triode.
(3) advantageous effect
Beneficial effects of the present invention：A kind of fault diagnosis reponse system of automobile LED car light can be automobile lamp list string
The driving and diagnosis that a small amount of LED applications provide low cost judge the working condition of LED by the voltage of the low side LED of monitoring, from
And circuit makes feedback action and provides feedback signal；The present invention can meet test request, and cost is relatively low, have preferable valence
Value.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
Obtain other attached drawings according to these attached drawings.
Fig. 1 is fault diagnosis reponse system schematic diagram of the present invention.
Related elements symbol description：Resistance R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13, R14,
R15；Transistor Q1, Q2, Q3；Voltage-stabiliser tube ZD1；LED light LT1, LT2, LT3；Three terminal regulator 7805；Operational amplifier U1, U2,
U3；Diode D1, D2；Input voltage Vi；Output signal Vo.
Specific implementation mode
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
The every other embodiment obtained without creative efforts, shall fall within the protection scope of the present invention.
In conjunction with Fig. 1, a kind of fault diagnosis reponse system of automobile LED car light, including drive module, sampling module, diagnosis
Module, feedback module.Drive module is linear or constant-current transistor formula driving circuit drives LED light by resistance-type；Sampling module
Low side LED light voltage in LED strings is acquired, rear pole diagnostic module is inputed to after voltage signal is scaled；Diagnostic module is to detecting
LED voltage carry out breakdown judge, and fault diagnosis signal is passed into feedback module；Feedback module is according to fault diagnosis signal
Feedback signal is sent out to drive module and exports fault-signal, drive module carries out the power-off control that is powered to LED light.
Drive module includes resistance R1, R2, transistor Q1, Q2, voltage-stabiliser tube ZD1, LED light LT1, LT2, LT3, input voltage
Vi.Input voltage Vi is connected by resistance R1 with the collector of transistor Q1, and input voltage Vi is also connected with the anode of LT1；LT1
Cathode be connected with the anode of LT2, the cathode of LT2 is connected with the anode of LT3, the cathode of LT3 and the collector phase of transistor Q2
Even；The base stage of transistor Q2 is connected with the collector of transistor Q1, and the emitter of transistor Q2 is grounded by resistance R2；Transistor
The emitter of Q1 is grounded, and the base stage of transistor Q1 sends out feedback signal according to fault diagnosis signal with feedback module and is connected；Voltage stabilizing
Pipe ZD1 is connected in parallel between the collector and emitter of transistor Q1；Transistor Q1, Q2 are NPN type triode.
Sampling module includes three terminal regulator 7805, resistance R3, R4, R5, R6, operational amplifier U1.Three terminal regulator
Input terminal is connected with input voltage Vi, three terminal regulator output+5V voltages；The inverting input of operational amplifier U1 passes through resistance
R3 is connected with the cathode of LT2, and the inverting input of operational amplifier U1 is also grounded by resistance R5, the same phase of operational amplifier U1
Input terminal is connected by resistance R4 with the cathode of LT3, and the in-phase input end for calculating amplifier U1 is also grounded by resistance R6, and operation is put
The output end of big device U1 is connected with fault diagnosis module；The output end of the power end and three terminal regulator 7805 of operational amplifier U1
It is connected, the ground terminal of operational amplifier U1 is connected to the ground.
Fault diagnosis module includes operational amplifier U2, U3, resistance R7, R8, R9, R10, R11, R12, diode D1, D2.
The in-phase input end of operational amplifier U2, the inverting input of operational amplifier U3 are connected with the output end of operational amplifier U1；
The inverting input of operational amplifier U2 is connected by resistance R7 with 7805 output end of three terminal regulator, and operational amplifier U2's is anti-
Phase input terminal is also grounded by resistance R8；The in-phase input end of operational amplifier U3 is defeated by resistance R9 and three terminal regulator 7805
Outlet is connected, and the in-phase input end of operational amplifier U3 is also grounded by resistance R10；The output end of operational amplifier U2 passes through electricity
Resistance R11, operational amplifier U3 output end be connected with 7805 output ends by resistance R12, the output end of operational amplifier U2 leads to
Cross diode D1, the output end of operational amplifier U3 is connected by diode D2 with feedback module.The electricity of operational amplifier U2, U3
Source is connected with the output end of three terminal regulator 7805, and the ground terminal of operational amplifier U2, U3 are connected to the ground.
Feedback module includes resistance R13, R14, R15, transistor Q3, output signal Vo.The base stage of transistor Q3 passes through electricity
Resistance R13 is connected with the cathode of diode D1, D2, and the collector of transistor Q3 is exported by resistance R14 and three terminal regulator 7805
End is connected, and the emitter of transistor Q3 is grounded by resistance R15, there is base stage and transistor Q1 of the feedback signal by transistor Q3
Base stage be connected, output signal Vo is connected with the collector of transistor Q3.Transistor Q3 is NPN type triode.
When it is implemented, based on LED light open circuit, short-circuit different voltages characteristic, the fault diagnosis of automobile LED car light is devised
Reponse system, including low side LED voltage is adopted during resistance-type is linear or constant-current transistor formula LED drive module, monitoring LED light string
Egf block, the feedback mould that is carried out by the diagnostic module of breakdown judge and is acted according to diagnostic signal for the LED voltage detected
Block.
For the scheme of single string 2-3 LED, resistance-type linear arrangement or constant-current transistor formula side may be selected in driving circuit
Case.Because supply voltage is most as low as 9V, and 3 LED operating voltage just 9V, if using the voltage on the low sides LED as feedback
Monitoring voltage, can because voltage it is too low, the transistor of pole after cannot opening and cause wrong diagnosis；Sampling module uses differential amplification
Circuit monitors the voltage difference at the both ends low side LED, bi-directional scaling to the exportable voltage of operational amplifier, and exports to rear pole
Diagnostic module.
Diagnostic module sets the threshold value of comparison voltage according to the operating voltage of LED.When LED is worked normally, two ratios
Low level is all exported compared with device；When low side LED open circuits, LED both end voltages are more than the maximum value of its normal working voltage, compare at this time
High level is exported compared with device 1, comparator 2 exports low level, by diode, final output high level；When low side LED short circuits or height
When other LED open circuits on side, LED both end voltages are less than the minimum value of its normal working voltage, and comparator 2 exports high electricity at this time
Flat, comparator 1 exports low level, by diode, final output high level.When LED is worked normally as a result, diagnostic module is defeated
Go out low level, when LED operation failure, diagnostic module exports high level.
Feedback module determines its action according to the diagnostic module output level of reception.When receiving low level, feedback
Module does not act driving circuit, and is output to the outside a high level to indicate it belong to normal operating conditions.Work as reception
When to high level, feedback module acts drive module, keeps it turned off to turn off driving function, and be output to the outside a low electricity
It puts down to indicate it belong to malfunction.
In conclusion the embodiment of the present invention, the fault diagnosis reponse system of automobile LED car light, can be automobile lamp list
A small amount of LED applications of going here and there provide inexpensive driving and diagnosis, by the voltage of the low side LED of monitoring, judge the working condition of LED,
Feedback signal is provided to which circuit makes feedback action；The present invention can meet test request, and cost is relatively low, have preferable valence
Value.
The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although with reference to the foregoing embodiments
Invention is explained in detail, it will be understood by those of ordinary skill in the art that：It still can be to aforementioned each implementation
Technical solution recorded in example is modified or equivalent replacement of some of the technical features；And these modification or
It replaces, the spirit and scope for various embodiments of the present invention technical solution that it does not separate the essence of the corresponding technical solution.
Claims (9)
1. a kind of fault diagnosis reponse system of automobile LED car light, it is characterised in that：Including drive module, sampling module, diagnosis
Module, feedback module, the drive module are linear or constant-current transistor formula driving circuit drives LED light by resistance-type；It is described
Sampling module acquires low side LED light voltage in LED strings, and rear pole diagnostic module is inputed to after voltage signal is scaled；The diagnosis
Module carries out breakdown judge to the LED voltage detected, and fault diagnosis signal is passed to feedback module；Feedback module according to
Fault diagnosis signal sends out feedback signal to drive module and exports fault-signal, and drive module carries out energization power-off to LED light
Control.
2. a kind of fault diagnosis reponse system of automobile LED car light as described in claim 1, which is characterized in that the driving
Module includes resistance R1, R2, transistor Q1, Q2, voltage-stabiliser tube ZD1, LED light LT1, LT2, LT3, input voltage Vi, the input
Voltage Vi is connected by resistance R1 with the collector of transistor Q1, and input voltage Vi is also connected with the anode of LT1；The LT1's
Cathode is connected with the anode of LT2, and the cathode of the LT2 is connected with the anode of LT3, the collection of the cathode and transistor Q2 of the LT3
Electrode is connected；The base stage of the transistor Q2 is connected with the collector of transistor Q1, and the emitter of transistor Q2 passes through resistance R2
Ground connection；The emitter of the transistor Q1 is grounded, and base stage and the feedback module of transistor Q1 are sent out instead according to fault diagnosis signal
Feedback signal is connected；The voltage-stabiliser tube ZD1 is connected in parallel between the collector and emitter of transistor Q1.
3. a kind of fault diagnosis reponse system of automobile LED car light as claimed in claim 2, which is characterized in that the crystal
Pipe Q1, Q2 are NPN type triode.
4. a kind of fault diagnosis reponse system of automobile LED car light as claimed in claim 2, which is characterized in that the sampling
Module includes three terminal regulator 7805, resistance R3, R4, R5, R6, operational amplifier U1, the input terminal of the three terminal regulator with
Input voltage Vi is connected, three terminal regulator output+5V voltages；The inverting input of the operational amplifier U1 by resistance R3 with
The cathode of LT2 is connected, and the inverting input of operational amplifier U1 is also grounded by resistance R5, the homophase input of operational amplifier U1
End is connected by resistance R4 with the cathode of LT3, and the in-phase input end for calculating amplifier U1 is also grounded by resistance R6, operational amplifier
The output end of U1 is connected with fault diagnosis module.
5. a kind of fault diagnosis reponse system of automobile LED car light as claimed in claim 4, which is characterized in that the operation
The power end of amplifier U1 is connected with the output end of three terminal regulator 7805, and the ground terminal of operational amplifier U1 is connected to the ground.
6. a kind of fault diagnosis reponse system of automobile LED car light as claimed in claim 4, which is characterized in that the failure
Diagnostic module includes operational amplifier U2, U3, resistance R7, R8, R9, R10, R11, R12, diode D1, D2, the operation amplifier
The in-phase input end of device U2, the inverting input of operational amplifier U3 are connected with the output end of operational amplifier U1；Operation amplifier
The inverting input of device U2 is connected by resistance R7 with 7805 output end of three terminal regulator, the inverting input of operational amplifier U2
Also it is grounded by resistance R8；The in-phase input end of operational amplifier U3 passes through resistance R9 and 7805 output end phase of three terminal regulator
Even, the in-phase input end of operational amplifier U3 is also grounded by resistance R10；The output end of operational amplifier U2 by resistance R11,
The output end of operational amplifier U3 is connected by resistance R12 with 7805 output ends, and the output end of operational amplifier U2 passes through two poles
Pipe D1, operational amplifier U3 output end be connected with feedback module by diode D2.
7. a kind of fault diagnosis reponse system of automobile LED car light as claimed in claim 6, which is characterized in that the operation
The power end of amplifier U2, U3 are connected with the output end of three terminal regulator 7805, ground terminal and the ground phase of operational amplifier U2, U3
Even.
8. a kind of fault diagnosis reponse system of automobile LED car light as claimed in claim 6, which is characterized in that the feedback
Module includes resistance R13, R14, R15, transistor Q3, output signal Vo, and the base stage of the transistor Q3 passes through resistance R13 and two
The cathode of pole pipe D1, D2 is connected, and the collector of transistor Q3 is connected by resistance R14 with 7805 output end of three terminal regulator, brilliant
The emitter of body pipe Q3 is grounded by resistance R15, has feedback signal to pass through the base stage of transistor Q3 and the base stage phase of transistor Q1
Even, output signal Vo is connected with the collector of transistor Q3.
9. a kind of fault diagnosis reponse system of automobile LED car light as claimed in claim 8, which is characterized in that the crystal
Pipe Q3 is NPN type triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711024124.3A CN108569212A (en) | 2017-10-27 | 2017-10-27 | A kind of fault diagnosis reponse system of automobile LED car light |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711024124.3A CN108569212A (en) | 2017-10-27 | 2017-10-27 | A kind of fault diagnosis reponse system of automobile LED car light |
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| CN108569212A true CN108569212A (en) | 2018-09-25 |
Family
ID=63576505
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| CN201711024124.3A Pending CN108569212A (en) | 2017-10-27 | 2017-10-27 | A kind of fault diagnosis reponse system of automobile LED car light |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110065430A (en) * | 2019-05-13 | 2019-07-30 | 四川水利职业技术学院 | The vehicle front lighting lamp system and its state monitoring method of carrier state feedback |
| WO2020181717A1 (en) * | 2019-03-13 | 2020-09-17 | 常州星宇车灯股份有限公司 | Vehicle lamp control circuit and vehicle |
| CN113696836A (en) * | 2021-08-26 | 2021-11-26 | 东风柳州汽车有限公司 | Fault diagnosis circuit and method for steering lamp |
| WO2023036298A1 (en) * | 2021-09-10 | 2023-03-16 | 长春捷翼汽车零部件有限公司 | Control circuit capable of detecting short circuit and open circuit of led, and charging base and electric vehicle |
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