CN103407409B - A kind of back mirror steering indicating light constant current driving control system - Google Patents
A kind of back mirror steering indicating light constant current driving control system Download PDFInfo
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- CN103407409B CN103407409B CN201310372622.2A CN201310372622A CN103407409B CN 103407409 B CN103407409 B CN 103407409B CN 201310372622 A CN201310372622 A CN 201310372622A CN 103407409 B CN103407409 B CN 103407409B
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Abstract
The invention provides a kind of back mirror steering indicating light constant current driving control system, it comprises load module, voltage reduction module, current stabilization module and LED; The voltage of load module input exports LED to through voltage reduction module and LED is lit, and when input voltage fluctuation, current stabilization module makes the curent change flowing through LED less.The constant current of the present invention's steering lamp of automobile rearview mirror by simple circuit realiration drives, and the brightness of automobile rearview mirror can not be changed because of the change of input voltage.The present invention makes full use of zener diode common at present and the operating characteristic of metal-oxide-semiconductor, the two creationaryly to be combined, makes only to need two elements can reach the effect of the existing current constant control needing integrated chip just can reach.
Description
Technical field
The present invention relates to technical field of automobile control, particularly relate to a kind of back mirror steering indicating light constant current driving control system.
Background technology
Back mirror steering indicating light refers to the steering indicating light be arranged on automobile rearview mirror, and relative to common fender guard steering indicating light, back mirror steering indicating light has obviously decoration function, also has relative security advantages in addition.Side turn signal is integrated in after in back mirror, and steering indicating light position is improved, and also just more easily discovers, have better warning function for the vehicle of side or pedestrian.For the proceeds posterolateral vehicle sailing rear view mirror blind zone into, the back mirror steering indicating light of higher position better can point out the vehicle in blind area, avoids the accident caused when doubling.
Existing back mirror steering indicating light patent, such as publication number is the Chinese patent of CN202283898, only show and arrange steering indicating light on back mirror, limits the signal light control of steering indicating light.And for example publication number is the Chinese patent of CN202806570, only defines the minute surface angulation of LED and back mirror, does not also make restriction to the signal light control of steering indicating light.Also have that such as publication number is CN102166989, publication number is CN202080196, publication number is the Chinese patents such as CN202686153, those patents all only give on back mirror again and arrange steering indicating light, to how to control steering indicating light brightness, how to ensure that steering indicating light does not change because of voltage fluctuation and all limit.
Summary of the invention
Technical matters to be solved by this invention is, for the above-mentioned deficiency of prior art, proposes a kind of back mirror steering indicating light constant current driving control system making back mirror steering indicating light light stable.
The technical scheme that the present invention solves the employing of its technical matters is that propose a kind of back mirror steering indicating light constant current driving control system, it comprises load module, voltage reduction module, current stabilization module and LED; The voltage of load module input exports LED to through voltage reduction module and LED is lit, and when input voltage fluctuation, current stabilization module makes the curent change flowing through LED less.
Further, described voltage reduction module comprises resistance R1, resistance R2; Described current stabilization module comprises zener diode and metal-oxide-semiconductor; Described resistance R1 one end access load module, other end access metal-oxide-semiconductor grid; Described resistance R2 one end access metal-oxide-semiconductor source class, other end ground connection; Described zener diode negative electrode access metal-oxide-semiconductor grid, plus earth; Described LED anode access load module, the drain electrode of negative electrode access metal-oxide-semiconductor.
Further, also comprise afterflow module, after input voltage cuts off, afterflow module makes LED slowly extinguish.
Further, described afterflow module is electric capacity, described electric capacity one end access load module, other end ground connection.
Further, diode and transient state zener diode is also comprised; Described diode anode access load module, negative electrode access LED anode; Described transient state zener diode one end access diode cathode, other end ground connection.
The constant current of the present invention's steering lamp of automobile rearview mirror by simple circuit realiration drives, and the brightness of automobile rearview mirror can not be changed because of the change of input voltage.The present invention makes full use of zener diode common at present and the operating characteristic of metal-oxide-semiconductor, the two creationaryly to be combined, makes only to need two elements can reach the effect of the existing current constant control needing integrated chip just can reach.
The present invention also sets up afterflow module in circuit, and after voltage is cut off, back mirror steering indicating light slowly extinguishes, thus makes the display effect of back mirror steering indicating light more attractive in appearance.
Accompanying drawing explanation
Fig. 1 is the functional block diagram of back mirror steering indicating light constant current driving control system in a preferred embodiment of the present invention;
Fig. 2 is the circuit diagram of back mirror steering indicating light constant current driving control system in a preferred embodiment of the present invention.
Detailed description of the invention
Please refer to Fig. 1, Fig. 1 is the functional block diagram of back mirror steering indicating light constant current driving control system in a preferred embodiment of the present invention.In Fig. 1, back mirror steering indicating light constant current driving control system comprises load module 10, voltage reduction module 20, current stabilization module 30 and LED 40.
The voltage that load module 10 inputs exports LED 40 to through voltage reduction module 20 and LED 40 is lit.When input voltage fluctuation, current stabilization module 30 makes the curent change flowing through LED 40 less.
Please refer to Fig. 2, Fig. 2 is the circuit diagram of back mirror steering indicating light constant current driving control system in a preferred embodiment of the present invention.In Fig. 2, voltage reduction module 20 is made up of resistance R1 and resistance R2, and current stabilization module 30 is made up of zener diode DS2 and metal-oxide-semiconductor Q1.
Resistance R1 and resistance R2 plays metering function in circuit, can be regulated the brightness of final LED by the resistance size of regulating resistance R1 and resistance R2.In a preferred embodiment, resistance R1 and resistance R2 is swept resistance, and the knob installing adjustable sliding resistance size at automotive interior makes user can according to the brightness oneself needing vehicles back mirror steering indicating light.
Resistance R1 one end access load module, other end access metal-oxide-semiconductor Q1 grid; Resistance R2 one end access metal-oxide-semiconductor source class, other end ground connection; Zener diode DS2 negative electrode access metal-oxide-semiconductor Q1 grid, plus earth; LED anode access load module 10, negative electrode access metal-oxide-semiconductor Q1 drain electrode.
When input voltage changes, according to the characteristic of zener diode, the curent change flowing through zener diode is larger, but pressure drop is less, this voltage-drop loading is in the grid of metal-oxide-semiconductor Q1, therefore the operating point drift of metal-oxide-semiconductor Q1 is less, makes the curent change flowing through LED less, makes LED brightness keep stable.
Further, the present invention also comprises afterflow module, and after input voltage is cut-off, afterflow module makes LED to extinguish at once, but slowly extinguishes, thus makes the decorative effect of back mirror steering indicating light more obvious.
In the present invention, afterflow module adopts electric capacity C1, electric capacity C1 one end access load module, other end ground connection.
During load module input voltage, electric capacity C1 charges, and electric capacity C1 can also play the effect of filtering voltage fluctuation.After load module cuts off input voltage, electric capacity C1 discharges, and powers for LED, and LED is slowly extinguished.
In another preferred embodiment, also comprise transient state zener diode TVS1 and diode DS1, transient state zener diode TVS1 one end access diode DS1 negative electrode, other end ground connection; Diode DS1 anode access load module 10, negative electrode access LED anode.
Diode DS1 makes electric current can only nonreturn flow, makes circuit safer.Transient diode TVS1 can prevent voltage instantaneous generation larger fluctuation and damage element.
Specific embodiment described herein is only to the explanation for example of the present invention's spirit.Those skilled in the art can make various amendment or supplement or adopt similar mode to substitute to described specific embodiment, but can't depart from spirit of the present invention or surmount the scope that appended claims defines.
Claims (4)
1. a back mirror steering indicating light constant current driving control system, is characterized in that: comprise load module, voltage reduction module, current stabilization module and LED; The voltage of load module input exports LED to through voltage reduction module and LED is lit, and when input voltage fluctuation, current stabilization module makes the curent change flowing through LED less; Described voltage reduction module comprises resistance R1, resistance R2; Described current stabilization module comprises zener diode and metal-oxide-semiconductor; Described resistance R1 one end access load module, other end access metal-oxide-semiconductor grid; Described resistance R2 one end access metal-oxide-semiconductor source electrode, other end ground connection; Described zener diode negative electrode access metal-oxide-semiconductor grid, plus earth; Described LED anode access load module, the drain electrode of negative electrode access metal-oxide-semiconductor.
2. back mirror steering indicating light constant current driving control system according to claim 1, is characterized in that: also comprise afterflow module, and after input voltage cuts off, afterflow module makes LED slowly extinguish.
3. back mirror steering indicating light constant current driving control system according to claim 2, is characterized in that: described afterflow module is electric capacity, described electric capacity one end access load module, other end ground connection.
4. back mirror steering indicating light constant current driving control system according to claim 1, is characterized in that: also comprise diode and transient state zener diode; Described diode anode access load module, negative electrode access LED anode; Described transient state zener diode one end access diode cathode, other end ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310372622.2A CN103407409B (en) | 2013-08-23 | 2013-08-23 | A kind of back mirror steering indicating light constant current driving control system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310372622.2A CN103407409B (en) | 2013-08-23 | 2013-08-23 | A kind of back mirror steering indicating light constant current driving control system |
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| CN103407409A CN103407409A (en) | 2013-11-27 |
| CN103407409B true CN103407409B (en) | 2015-11-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310372622.2A Active CN103407409B (en) | 2013-08-23 | 2013-08-23 | A kind of back mirror steering indicating light constant current driving control system |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6663303B2 (en) * | 2016-06-01 | 2020-03-11 | 株式会社ミツバ | Lighting system |
| CN110908211B (en) * | 2019-12-17 | 2023-05-26 | 深圳市光羿科技有限公司 | Electrochromic device control circuit |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3306723A1 (en) * | 1982-03-26 | 1983-10-06 | Siemens Ag | Safety arrangement for a flasher signal generator controlled by an integrated circuit |
| CN201294664Y (en) * | 2008-10-21 | 2009-08-19 | 深圳万润科技股份有限公司 | High-efficiency LED lamp drive circuit |
| CN101815382A (en) * | 2010-04-02 | 2010-08-25 | 上海小糸车灯有限公司 | Step-down constant current LED drive circuit for automobile lighting |
| CN201821546U (en) * | 2010-09-01 | 2011-05-04 | 中山银利自动化系统设备有限公司 | LED light source driving power supply |
| CN102452352A (en) * | 2010-10-28 | 2012-05-16 | 比亚迪股份有限公司 | Detection and control circuit of LED (light-emitting diode) steering lamps and detection method thereof |
-
2013
- 2013-08-23 CN CN201310372622.2A patent/CN103407409B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3306723A1 (en) * | 1982-03-26 | 1983-10-06 | Siemens Ag | Safety arrangement for a flasher signal generator controlled by an integrated circuit |
| CN201294664Y (en) * | 2008-10-21 | 2009-08-19 | 深圳万润科技股份有限公司 | High-efficiency LED lamp drive circuit |
| CN101815382A (en) * | 2010-04-02 | 2010-08-25 | 上海小糸车灯有限公司 | Step-down constant current LED drive circuit for automobile lighting |
| CN201821546U (en) * | 2010-09-01 | 2011-05-04 | 中山银利自动化系统设备有限公司 | LED light source driving power supply |
| CN102452352A (en) * | 2010-10-28 | 2012-05-16 | 比亚迪股份有限公司 | Detection and control circuit of LED (light-emitting diode) steering lamps and detection method thereof |
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| CN103407409A (en) | 2013-11-27 |
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