CN104349558B - Automobile LED steering indicating light drive circuit - Google Patents
Automobile LED steering indicating light drive circuit Download PDFInfo
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- CN104349558B CN104349558B CN201410629604.2A CN201410629604A CN104349558B CN 104349558 B CN104349558 B CN 104349558B CN 201410629604 A CN201410629604 A CN 201410629604A CN 104349558 B CN104349558 B CN 104349558B
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- resistance
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- indicating light
- steering indicating
- drive circuit
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- 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
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Abstract
The invention discloses a kind of automobile LED steering indicating light drive circuit, including amplifying circuit, drive circuit, testing circuit and feedback circuit；Amplifying circuit connects the outfan of MCU, power level and drive circuit respectively；Drive circuit is connection detection circuit, feedback circuit and LED steering indicating light load respectively；Feedback circuit connects amplifying circuit；Testing circuit connects the AD input of MCU.The present invention may identify which the short trouble of LED steering indicating light load and falls lamp failure, circuit is simple, it is used that components and parts are few, reduce cost, and it is stable and reliable for performance, can manufacture, it is possible to transplantability is strong, directly can use on any a automobile vehicle body controller, improve the development rate of product, work efficiency and the market competitiveness, reduce development time and the development cost of product.
Description
Technical field
The present invention relates to automobile body control module technical field, be specifically related to a kind of automobile LED steering indicating light drive circuit.
Background technology
Turn signal is that motor vehicles are turned or fore-aft vehicle gives when overtaking other vehicles a kind of signal of interest device of bulletin; its working condition directly influences traffic safety; control to drive to the flash of light controlling to require both to have included turn signal of steering indicating light, also include king light and fall the malfunction coefficient of lamp and the short-circuit protection of steering indicating light.
Steering indicating light headlight in the market, side lamp many employings bulb, taillight many employings LED, drive the intelligent power driving chip being generally adopted belt current feedback detection to drive steering indicating light.But LED taillight power is less, it is typically in below 8W, and front directional power is typically in more than 21W, if LED taillight falls lamp, because the curent change in circuit is relatively small, the current feedback change of intelligent power driving chip is also only small, add the instability (9-16V) of automobile level voltage, the current feedback of driving chip is more difficult to define, therefore is difficult to accurately to identify that what turn to LED taillight falls lamp, so also just cannot carry out the malfunction coefficient of frequency multiplication flicker when turning to LED taillight to fall lamp.
For solving above difficulty, need turning to LED taillight individually to drive independent current detecting to identify that it falls lamp, but now as still used intelligent power driving chip, steering indicating light controls to use two driving chip, cost significantly rising product competitiveness is caused sharply to glide, and this driving chip is entirely import device, price high (about 8 yuan) and procurement cycle are long, are not suitable for the project that the construction cycle is shorter and cost requirement is higher.
Summary of the invention
The present invention is to solve existing drive circuit is difficult to detect by taillight falls lamp failure, if LED taillight is individually detected, then cost increases, and causes degradation technical problem under product competitiveness.Thus provide one have steering indicating light short-circuit protection and precisely identify that taillight falls lamp failure, can improve the standard drive circuit of steering indicating light drive circuit cost performance comprehensively.
For solving above-mentioned technical problem, the technical solution adopted in the present invention is as follows:
A kind of automobile LED steering indicating light drive circuit, including amplifying circuit, drive circuit, testing circuit and feedback circuit；Amplifying circuit connects the outfan of MCU (microprocessor), power level and drive circuit respectively；Drive circuit is connection detection circuit, feedback circuit and LED steering indicating light load respectively；Feedback circuit connects amplifying circuit；Testing circuit connects the AD input of MCU.
Described amplifying circuit is made up of switch triode Q1, resistance R3, resistance R4 and resistance R7, and resistance R3 and resistance R4 is connected in parallel rear one end and is connected with power level, and the other end is connected with the colelctor electrode C of switch triode Q1；The emitter E of switch triode Q1 connects one end of resistance R7, the other end ground connection of resistance R7；The base stage B of switch triode Q1 is connected to the outfan of MCU through resistance R5.
Described drive circuit is made up of power discharging transistor Q2, resistance R8 and resistance R9, and resistance R8 and resistance R9 is connected in parallel rear one end ground connection, and the other end is connected with the emitter E of power discharging transistor Q2；Colelctor electrode C and the LED steering indicating light load of power discharging transistor Q2 is connected；The base stage of power discharging transistor Q2 is connected with the emitter E of switch triode Q1.
Described feedback circuit is made up of audion Q3, and the emitter E of the base stage B of audion Q3 and power discharging transistor Q2 is connected；The emitter E ground connection of audion Q3；The base stage of the colelctor electrode C and switch triode Q1 of audion Q3 is connected.
Described testing circuit is made up of resistance R2 and resistance R1, and one end of resistance R2 is connected to the colelctor electrode C of power discharging transistor Q2, and the other end of resistance R2 is connected with one end of resistance R1, the other end ground connection of resistance R1；Node between resistance R1 and resistance R2 is connected on the AD input of MCU.
It is connected to resistance R6 between the base stage and the base stage of power discharging transistor Q2 of switch triode Q1.
Filter capacitor C1 between the colelctor electrode C and steering indicating light group of power discharging transistor Q2.
The present invention controls the break-make of switch triode Q1 and power discharging transistor Q2 by MCU, controls the duty of LED steering indicating light load.MCU, by detecting the height of voltage on testing circuit, identifies whether LED steering indicating light load short trouble occurs or fall lamp failure and make respective reaction, plays a protective role.MCU can carry out disappearing when detecting trembling process, improves and identifies the accuracy judged.It is provided with feedback circuit between the emitter E and the base stage of switch triode Q1 of power discharging transistor Q2.The existence of feedback circuit, when LED steering indicating light load circuit electric current is excessive, can cut off amplifying circuit and drive circuit immediately；Simultaneously also judge whether LED steering indicating light load short trouble occurs or fall lamp failure and leave time enough for MCU, further enhancing the self-shield ability of the present invention.
The present invention may identify which the short trouble of LED steering indicating light load and falls lamp failure, circuit is simple, it is used that components and parts are few, reduce cost, and it is stable and reliable for performance, can manufacture, it is possible to transplantability is strong, directly can use on any a automobile vehicle body controller, improve the development rate of product, work efficiency and the market competitiveness, reduce development time and the development cost of product.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of the present invention.
Detailed description of the invention
Embodiment: as it is shown in figure 1, a kind of automobile LED steering indicating light drive circuit, including amplifying circuit, drive circuit, testing circuit and feedback circuit.
Amplifying circuit is made up of switch triode Q1, resistance R3, resistance R4 and resistance R7.Resistance R3 and resistance R4 is connected in parallel rear one end and is connected with power level, and the other end is connected with the colelctor electrode C of switch triode Q1；The base stage B of switch triode Q1 is connected to the outfan of MCU through resistance R5；The emitter E of switch triode Q1 is connected with the base stage B of one end of resistance R7 and power discharging transistor Q2 respectively；The other end ground connection of resistance R7.
Resistance R6 is connected between the base stage B of amplifying triode Q1 and the base stage B of power discharging transistor Q2.
The emitter E of the power discharging transistor Q2 resistance R8 through being in parallel and resistance R9 ground connection；The base stage B of audion Q3 is connected to the emitter E of power discharging transistor Q2, the emitter E ground connection of audion Q3, and the colelctor electrode C of audion Q3 is connected to the base stage B of amplifying triode Q1.Colelctor electrode C and the LED steering indicating light load of power discharging transistor Q2 and power supply thereof are connected.
One end of resistance R2 is connected to the colelctor electrode C of power discharging transistor Q2, and the other end of resistance R2 is connected with resistance R1, resistance R1 ground connection.Node between resistance R2 and resistance R1 is connected with the AD input of MCU.
Filter capacitor C1 between colelctor electrode C and LED steering indicating light load and the power supply thereof of power discharging transistor Q2.
Work process: LTnLed-AD, LTnLed-Ctrl connect AD input pin and the output pin of MCU respectively, and LTnLed-Out connects LED steering indicating light load and power supply thereof, and power supply is whole drive circuitry, and VBAT connects power level.The present invention detects numerical value by the AD of voltage on the MCU resistance R1 to collecting and carries out judging whether LED steering indicating light load short circuit occurs or fall lamp.
Added with level voltage between switch triode Q1 colelctor electrode C and emitter E, when MCU exports high level, the voltage being added between switch triode Q1 base stage B and emitter E reaches conducting voltage, switch triode Q1 turns on, after switch triode Q1 conducting, the voltage being added between power discharging transistor Q2 base stage B and emitter E reaches conducting voltage, power supply passes through LED steering indicating light load between colelctor electrode C and the emitter E of power discharging transistor Q2 added with malleation again, so power discharging transistor Q2 conducting, LED steering indicating light load is energized.
If LED steering indicating light load is without short trouble, the voltage that the voltage of power supply is all divided by LED steering indicating light load consumption, resistance R1 and resistance R2 is only small, and the input signal that namely MCU collects is low level.
If the voltage that resistance R1 and resistance R2 divides is significantly high, being namely transferred to the MCU input signal collected is high level, then illustrate that LED steering indicating light is loaded with short trouble, and MCU turns off amplifying circuit and drive circuit, carries out short-circuit protection.
When MCU output low level, switch triode Q1 and power discharging transistor Q2 is all not turned on.If LED steering indicating light load is without falling lamp failure, then the voltage of power supply is added in resistance R1 and resistance R2 completely, and the input signal that namely MCU collects is high level.
If the voltage on resistance R1 and resistance R2 is only small, the input signal that namely MCU gathers is low level, then illustrate that LED steering indicating light is loaded with lamp failure.MCU promotes the frequency of output square wave, and the steering indicating light frequency multiplication not broken down is glimmered.
The input signal collected can be disappeared and tremble process by MCU, to improve the accuracy identifying failure judgement.
When power discharging transistor Q2 turns on, audion Q3 plays the effect of overcurrent protection.If the electric current in LED steering indicating light load circuit is excessive, the voltage being added between audion Q3 base stage B and emitter E reaches conducting voltage, audion Q3 turns on, the voltage being added between switch triode Q1 base stage B and emitter E is reduced, and then switch triode Q1 turns off, power discharging transistor Q2 turns off therewith, and LED steering indicating light load circuit disconnects.The existence of feedback circuit, when LED steering indicating light load circuit electric current is excessive, can immediately turn off amplifying circuit and drive circuit, further enhancing the self-shield ability of the present invention.
Claims (1)
1. an automobile LED steering indicating light drive circuit, it is characterised in that: include amplifying circuit, drive circuit, testing circuit and feedback circuit；Amplifying circuit connects power level, the outfan of MCU and drive circuit respectively；Drive circuit is connection detection circuit, feedback circuit and LED steering indicating light load respectively；Feedback circuit connects amplifying circuit；Testing circuit connects the AD input of MCU；Described amplifying circuit is made up of switch triode Q1, resistance R3, resistance R4 and resistance R7, and resistance R3 and resistance R4 is connected in parallel rear one end and is connected with power level, and the other end is connected with the colelctor electrode C of switch triode Q1；The emitter E of switch triode Q1 connects one end of resistance R7, the other end ground connection of resistance R7；The base stage B of switch triode Q1 is connected to the outfan of MCU through resistance R5；Described drive circuit is made up of power discharging transistor Q2, resistance R8 and resistance R9, and resistance R8 and resistance R9 is connected in parallel rear one end ground connection, and the other end is connected with the emitter E of power discharging transistor Q2；Colelctor electrode C and the LED steering indicating light load of power discharging transistor Q2 is connected；The base stage of power discharging transistor Q2 is connected with the emitter E of switch triode Q1；Described feedback circuit is made up of audion Q3, and the emitter E of the base stage B of audion Q3 and power discharging transistor Q2 is connected；The emitter E ground connection of audion Q3；The base stage of the colelctor electrode C and switch triode Q1 of audion Q3 is connected；Described testing circuit is made up of resistance R2 and resistance R1, and one end of resistance R2 is connected to the colelctor electrode C of power discharging transistor Q2, and the other end of resistance R2 is connected with one end of resistance R1, the other end ground connection of resistance R1；Node between resistance R1 and resistance R2 is connected on the AD input of MCU；It is connected to resistance R6 between the base stage and the base stage of power discharging transistor Q2 of switch triode Q1；Filter capacitor C1 between the colelctor electrode C and steering indicating light group of power discharging transistor Q2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410629604.2A CN104349558B (en) | 2014-11-11 | 2014-11-11 | Automobile LED steering indicating light drive circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410629604.2A CN104349558B (en) | 2014-11-11 | 2014-11-11 | Automobile LED steering indicating light drive circuit |
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| Publication Number | Publication Date |
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| CN104349558A CN104349558A (en) | 2015-02-11 |
| CN104349558B true CN104349558B (en) | 2016-07-27 |
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| CN201410629604.2A Active CN104349558B (en) | 2014-11-11 | 2014-11-11 | Automobile LED steering indicating light drive circuit |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108401332A (en) * | 2018-04-28 | 2018-08-14 | 惠州市德赛西威汽车电子股份有限公司 | A kind of LED drive circuit exporting constant-current discharge over the ground |
| CN108944654A (en) * | 2018-08-01 | 2018-12-07 | 杨志超 | A kind of automobile tail light brake degree display control program |
| CN111412629A (en) * | 2020-03-30 | 2020-07-14 | 珠海格力电器股份有限公司 | Load control device, air conditioner and load control method of air conditioner |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201860489U (en) * | 2010-10-21 | 2011-06-08 | 上海小糸车灯有限公司 | Automobile lighting LED drive short circuit protection circuit |
| CN203206559U (en) * | 2013-04-26 | 2013-09-18 | 福建工程学院 | LED turn signal |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202931616U (en) * | 2012-10-22 | 2013-05-08 | 上海晨阑光电器件有限公司 | Automobile daytime running lamp module |
| CN103716957A (en) * | 2013-11-28 | 2014-04-09 | 青岛歌尔声学科技有限公司 | Light emitting diode (LED) control circuit and method |
| CN204259221U (en) * | 2014-11-11 | 2015-04-08 | 河南天海电器有限公司 | Automobile LED direction indicator lamp drive circuit |
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- 2014-11-11 CN CN201410629604.2A patent/CN104349558B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201860489U (en) * | 2010-10-21 | 2011-06-08 | 上海小糸车灯有限公司 | Automobile lighting LED drive short circuit protection circuit |
| CN203206559U (en) * | 2013-04-26 | 2013-09-18 | 福建工程学院 | LED turn signal |
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