CN204547902U - A kind of back mirror steering indicating light constant current drived control circuit - Google Patents
A kind of back mirror steering indicating light constant current drived control circuit Download PDFInfo
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- CN204547902U CN204547902U CN201520239554.7U CN201520239554U CN204547902U CN 204547902 U CN204547902 U CN 204547902U CN 201520239554 U CN201520239554 U CN 201520239554U CN 204547902 U CN204547902 U CN 204547902U
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Abstract
The utility model relates to a kind of back mirror steering indicating light constant current drived control circuit, comprises power input, constant current assembly, continued flow component and LED; The voltage of power input exports LED to through constant current assembly, and LED is bright; Constant current assembly comprises resistance R1, resistance R2, aerotron Q1 and stabilivolt D2; Resistance R1 one end access power input, the base stage of the other end access aerotron Q1 of resistance R1; The emitter of resistance R2 one end access aerotron Q2, resistance R2 other end ground connection; The base stage of the negative electrode connecting triode Q1 of stabilivolt D2, the plus earth of stabilivolt D2, LED anode connects power input, the collecting electrode of LED negative electrode connecting triode Q1, the utility model utilizes stabilivolt common at present when reverse breakdown and aerotron current characteristics, and the brightness of driving LED lamp is constant.
Description
Technical field
The utility model belongs to electronic applications, relates to a kind of field of electric control, particularly a kind of back mirror steering indicating light constant current drived control circuit.
Background technology
The steering indicating light of automobile, no matter prompting instrument when turning in the process of moving as vehicle or keep to the side, be in vehicle traveling process or by pulling over observing, all need to use steering indicating light.So steering indicating light is as a requisite instrument on automobile, stability during its work is very important.
The current steering indicating light control system using commonplace has integrated level lower, but the control system that stability is poor.Also have the control system adopting the integrated level of micro controller system or other chips higher, but such control system manufacturing cost is higher.Such as publication number is the Chinese patent " a kind of Vehicular turn lamp control system " of CN201210300828, and this control system integration degree is higher, has used integrated chip and the MOSFET pipe of micro controller system, so its control system manufacturing cost is higher in its control system.
Summary of the invention
The purpose of this utility model there are the problems referred to above for existing technology, proposes a kind of integrated level lower, but good stability, the steering indicating light control system of low cost of manufacture.
The purpose of this utility model realizes by following technical proposal: a kind of back mirror steering indicating light constant current drived control circuit, is characterized in that: comprise power input, constant current assembly, continued flow component and LED; The voltage of power input exports LED to through constant current assembly, and LED is bright; Described constant current assembly comprises resistance R1, resistance R2, aerotron Q1 and stabilivolt D2; Described resistance R1 one end access power input, the base stage of the other end access aerotron Q1 of resistance R1; The emitter of described resistance R2 one end access aerotron Q2, resistance R2 other end ground connection; The base stage of the negative electrode connecting triode Q1 of described stabilivolt D2, the plus earth of stabilivolt D2, described LED anode connects power input, the collecting electrode of LED negative electrode connecting triode Q1, when input voltage fluctuation, constant current assembly makes the electric current flowing through LED constant.
Further, described continued flow component comprises electric capacity C1 and the electric capacity C2 of series connection, and circuit series one end of electric capacity C1 and electric capacity C2 connects power input, other end ground connection, after the input voltage at power input cuts off, electric capacity C1 and electric capacity C2 provides LED voltage, and LED is slowly extinguished.
Further, diode D1 is also connected with between described power input and LED; The anode access power input of described diode D1, the negative electrode access LED anode of diode D1, when the voltage of power input reaches the conducting-state voltage of diode D1, driving LED lamp is luminous.
Compared with prior art, the utility model utilizes stabilivolt common at present when reverse breakdown, in certain range of current, the amplified current characteristic of the characteristic that terminal voltage is almost constant and aerotron, design reliable and stable constant-current drive circuit, the brightness of driving LED lamp is constant, the utility model reach with integrated chip same effect while, reduce productive costs, and circuit layout is more simple.
Accompanying drawing explanation
Fig. 1 is schematic circuit diagram of the present utility model.
Detailed description of the invention
Be below specific embodiment of the utility model and by reference to the accompanying drawings, the technical solution of the utility model is further described, but the utility model be not limited to these embodiments.
As shown in Figure 1, a kind of back mirror steering indicating light constant current drived control circuit, comprises power input, diode D1, constant current assembly, continued flow component and LED; Wherein after the voltage of power input reaches the conducting-state voltage of diode D1, diode D1 conducting, electric current constant current assembly regulates the constant electric current of input LED, LED brightness constancy, and the electric current that the setting of diode D1 prevents from inputting LED is instantaneously excessive and damage LED.
Wherein constant current assembly comprises resistance R1, resistance R2, aerotron Q1 and stabilivolt D2; Described resistance R1 one end access power input, the base stage of the other end access aerotron Q1 of resistance R1; The emitter of described resistance R2 one end access aerotron Q2, resistance R2 other end ground connection; The base stage of the negative electrode connecting triode Q1 of described stabilivolt D2, the plus earth of stabilivolt D2, described LED anode connects power input, the collecting electrode of LED negative electrode connecting triode Q1, in the present embodiment, the resistance of resistance R1 is 470 Ω, and the resistance of resistance R2 is 43K Ω.
When fluctuation appears in the voltage inputted, voltage, after resistance R1 step-down, reaches the conducting-state voltage of aerotron Q1, aerotron Q1 conducting, and stabilivolt D2 reverse breakdown, stabilivolt keeps the voltage of aerotron Q1 base terminal constant, namely the electric current flowing into LED is constant, LED brightness constancy.
In the present embodiment, afterflow module comprises electric capacity C1 and electric capacity C2, the series connection of electric capacity C1 and electric capacity C2, circuit on one side after series connection connects power input, other end ground connection, when after the input voltage of power input is cut-off, in order to prevent LED immediate current excessive, electric capacity C1 and electric capacity C2 provides LED voltage, and LED is slowly extinguished.
In order to circuit immediate current after preventing supply disconnecton is further excessive in the present embodiment, be provided with transient voltage suppressor D3, the plus earth of transient voltage suppressor D3, the negative electrode of transient voltage suppressor D3 connects the negative electrode of diode D1.
The utility model utilizes stabilivolt common at present when reverse breakdown, in certain range of current, the amplified current characteristic of the characteristic that terminal voltage is almost constant and aerotron, design reliable and stable constant-current drive circuit, the brightness of driving LED lamp is constant, the utility model reach with integrated chip same effect while, reduce productive costs, and circuit layout is more simple.
Specific embodiment described herein is only to the explanation for example of the utility model spirit.The utility model person of ordinary skill in the field can make various amendment or supplements or adopt similar mode to substitute to described specific embodiment, but can't depart from spirit of the present utility model or surmount the scope that appended claims defines.
Claims (3)
1. a back mirror steering indicating light constant current drived control circuit, is characterized in that: comprise power input, constant current assembly, continued flow component and LED; The voltage of power input exports LED to through constant current assembly, and LED is bright; Described constant current assembly comprises resistance R1, resistance R2, aerotron Q1 and stabilivolt D2; Described resistance R1 one end access power input, the base stage of the other end access aerotron Q1 of resistance R1; The emitter of described resistance R2 one end access aerotron Q2, resistance R2 other end ground connection; The base stage of the negative electrode connecting triode Q1 of described stabilivolt D2, the plus earth of stabilivolt D2, described LED anode connects power input, the collecting electrode of LED negative electrode connecting triode Q1, when input voltage fluctuation, constant current assembly makes the electric current flowing through LED constant.
2. a kind of back mirror steering indicating light constant current drived control circuit according to claim 1, it is characterized in that: described continued flow component comprises electric capacity C1 and the electric capacity C2 of series connection, circuit series one end of electric capacity C1 and electric capacity C2 connects power input, other end ground connection, after the input voltage at power input cuts off, electric capacity C1 and electric capacity C2 provides LED voltage, and LED is slowly extinguished.
3. a kind of back mirror steering indicating light constant current drived control circuit according to claim 1, is characterized in that: be also connected with diode D1 between described power input and LED; The anode access power input of described diode D1, the negative electrode access LED anode of diode D1, when the voltage of power input reaches the conducting-state voltage of diode D1, driving LED lamp is luminous.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520239554.7U CN204547902U (en) | 2015-04-20 | 2015-04-20 | A kind of back mirror steering indicating light constant current drived control circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520239554.7U CN204547902U (en) | 2015-04-20 | 2015-04-20 | A kind of back mirror steering indicating light constant current drived control circuit |
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| CN204547902U true CN204547902U (en) | 2015-08-12 |
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| CN201520239554.7U Active CN204547902U (en) | 2015-04-20 | 2015-04-20 | A kind of back mirror steering indicating light constant current drived control circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108076558A (en) * | 2017-08-09 | 2018-05-25 | 肖志军 | The LED light method for stabilizing voltage and circuit of input voltage fluctuation variation can be adapted to automatically |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108076558A (en) * | 2017-08-09 | 2018-05-25 | 肖志军 | The LED light method for stabilizing voltage and circuit of input voltage fluctuation variation can be adapted to automatically |
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