CN203068373U - Lightness stabilizing device of vehicle instrument panel lamp - Google Patents
Lightness stabilizing device of vehicle instrument panel lamp Download PDFInfo
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- CN203068373U CN203068373U CN2013200873564U CN201320087356U CN203068373U CN 203068373 U CN203068373 U CN 203068373U CN 2013200873564 U CN2013200873564 U CN 2013200873564U CN 201320087356 U CN201320087356 U CN 201320087356U CN 203068373 U CN203068373 U CN 203068373U
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- width modulation
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Abstract
The utility model discloses a lightness stabilizing device of a vehicle instrument panel lamp, relates to the lightness stabilizing device of a vehicle instrument panel lamp, and aims to solve the problem that the illuminating brightness of the conventional vehicle instrument panel is unstable. The lightness stabilizing device comprises a diode (D), a resistance (R3), a switch tube (Q), a resistance (R2), a resistance (R1), a pulse-width modulation circuit, a resistance (R4), a resistance (R5), and a resistance (R6), wherein the positive pole of D is connected with a power supply (V), the negative pole of D is connected with the positive pole of an LED light source (T) and one end of R5, the negative pole of T is connected with one end of R3, the other end of R3 is connected with the source electrode of Q, the drain electrode of Q is connected with one end of R1 and is grounded, the grid electrode of Q is connected with the other end of R1 and one end of R2, the other end of R2 is connected with the controlling signal output end of the pulse-width modulation circuit, the controlling signal input end of the pulse-width modulation circuit is connected with one end of R4, the other end of R4 is connected with the other end of R5 and one end of R6, and the other end of R6 is grounded.
Description
Technical field
The utility model relates to fascia brightness of illumination stabilising arrangement.
Background technology
Light emitting diode is the synthetic diode of semi-conducting material, is made up of PN junction, and when adding forward voltage, electronics is combined with electric hole with photon form released energy, therefore has the characteristics of luminescence.Lumination of light emitting diode brightness can be regulated by the size of operating voltage (electric current).In very big current margin, the brightness of light emitting diode improves with the increase of electric current.
The brightness of light emitting diode is different with the size of electric current, and produced light emitting diode, and its voltage and current curve are variant slightly, thereby the brightness of LED illumination often can't be stablized with the change of supply voltage.For keeping the brightness stability unanimity, need the light emitting diode constant-flow driver to realize.If light emitting diode is operated in the fixed current pattern, the brightness unanimity.The light emitting diode long-term work can be kept the long life-span under certain electric current.
Fascia generally adopts light emitting diode to throw light on.Because the electrical equipment in the automobile is by the automobile storage battery power supply, its spread of voltage causes the brightness of illumination instability of fascia.
The utility model content
The purpose of this utility model provides a kind of fascia lighting brightness stabilising arrangement, to solve the brightness of illumination problem of unstable of existing fascia.It comprises diode D, resistance R 3, switching tube Q, resistance R 2, resistance R 1, pulse-width modulation circuit 1, resistance R 4, resistance R 5 and resistance R 6, the anodal power supply V that connects of diode D, the negative pole of diode D connects the positive pole of led light source T and an end of resistance R 5, the negative pole of led light source T connects an end of resistance R 3, the other end of resistance R 3 connects the source electrode of switching tube Q, the drain electrode of switching tube Q connects an end and the ground connection of resistance R 1, the grid of switching tube Q connects the other end of resistance R 1 and an end of resistance R 2, the other end of resistance R 2 connects the control signal output of pulse-width modulation circuit 1, the signal input part of pulse-width modulation circuit 1 connects an end of resistance R 4, the other end of resistance R 4 connects the other end of resistance R 5 and an end of resistance R 6, the other end ground connection of resistance R 6.
When the output voltage stabilization of power supply V, by the stable signal of pulse-width modulation circuit 1 output and be applied on the grid of switching tube Q, switching tube Q conducting makes led light source T stably luminous.If the output voltage of power supply V changes, the voltage signal that obtains by resistance R 5 and resistance R 6 dividing potential drops changes, this variation is input to pulse-width modulation circuit 1, pass through computer program, the pulse width of corresponding adjustment pulse-width modulation circuit 1 output, and then offset the variation that led light source T goes up voltage.The utility model has solved the brightness of illumination problem of unstable of existing fascia.
Description of drawings
Fig. 1 is structural representation of the present utility model.
The specific embodiment
The specific embodiment one: specify present embodiment below in conjunction with Fig. 1.Present embodiment comprises diode D, resistance R 3, switching tube Q, resistance R 2, resistance R 1, pulse-width modulation circuit 1, resistance R 4, resistance R 5 and resistance R 6, the anodal power supply V that connects of diode D, the negative pole of diode D connects the positive pole of led light source T and an end of resistance R 5, the negative pole of led light source T connects an end of resistance R 3, the other end of resistance R 3 connects the source electrode of switching tube Q, the drain electrode of switching tube Q connects an end and the ground connection of resistance R 1, the grid of switching tube Q connects the other end of resistance R 1 and an end of resistance R 2, the other end of resistance R 2 connects the control signal output of pulse-width modulation circuit 1, the signal input part of pulse-width modulation circuit 1 connects an end of resistance R 4, the other end of resistance R 4 connects the other end of resistance R 5 and an end of resistance R 6, the other end ground connection of resistance R 6.It is the chip realization of LPD78F0836 that pulse-width modulation circuit 1 adopts model.
The specific embodiment two: specify present embodiment below in conjunction with Fig. 1.Present embodiment is that it also comprises capacitor C with respect to the characteristics of embodiment one, and an end of capacitor C is connected the signal input part of pulse-width modulation circuit 1, the other end ground connection of capacitor C.By hardware setting, further regulated output voltage.Combination by hardware and software reaches low energy consumption and keeps the mode of operation of constant current.Other is identical with embodiment one.
The specific embodiment three: specify present embodiment below in conjunction with Fig. 1.Present embodiment is that led light source T is made up of a plurality of light emitting diodes with respect to the characteristics of embodiment one, and a plurality of light emitting diode parallel connections, series connection or series-parallel connection link together.The expected service life of light emitting diode is 50,000 hours, possesses the benefit of " redundancy " based on the illumination scheme of a plurality of LED, even a LED breaks down, still can continue illumination.Other is identical with embodiment one.
Claims (4)
1. fascia lighting brightness stabilising arrangement, it is characterized in that it comprises diode (D), resistance (R3), switching tube (Q), resistance (R2), resistance (R1), pulse-width modulation circuit (1), resistance (R4), resistance (R5) and resistance (R6), the anodal power supply (V) that connects of diode (D), the negative pole of diode (D) connects the positive pole of led light source (T) and an end of resistance (R5), the negative pole of led light source (T) connects an end of resistance (R3), the other end of resistance (R3) connects the source electrode of switching tube (Q), the drain electrode of switching tube (Q) connects an end and the ground connection of resistance (R1), the grid of switching tube (Q) connects the other end of resistance (R1) and an end of resistance (R2), the other end of resistance (R2) connects the control signal output of pulse-width modulation circuit (1), the signal input part of pulse-width modulation circuit (1) connects an end of resistance (R4), the other end of resistance (R4) connects the other end of resistance (R5) and an end of resistance (R6), the other end ground connection of resistance (R6).
2. fascia lighting brightness stabilising arrangement according to claim 1 is characterized in that it is the chip of LPD78F0836 that pulse-width modulation circuit (1) adopts model.
3. fascia lighting brightness stabilising arrangement according to claim 1 is characterized in that it also comprises electric capacity (C), and an end of electric capacity (C) is connected the signal input part of pulse-width modulation circuit (1), the other end ground connection of electric capacity (C).
4. fascia lighting brightness stabilising arrangement according to claim 1 is characterized in that led light source (T) is made up of a plurality of light emitting diodes, and a plurality of light emitting diode parallel connections, series connection or series-parallel connection link together.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013200873564U CN203068373U (en) | 2013-02-26 | 2013-02-26 | Lightness stabilizing device of vehicle instrument panel lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013200873564U CN203068373U (en) | 2013-02-26 | 2013-02-26 | Lightness stabilizing device of vehicle instrument panel lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203068373U true CN203068373U (en) | 2013-07-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013200873564U Expired - Fee Related CN203068373U (en) | 2013-02-26 | 2013-02-26 | Lightness stabilizing device of vehicle instrument panel lamp |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203068373U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107864535A (en) * | 2017-12-13 | 2018-03-30 | 刘向宁 | Light emitting diode adjusts stream drive circuit |
-
2013
- 2013-02-26 CN CN2013200873564U patent/CN203068373U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107864535A (en) * | 2017-12-13 | 2018-03-30 | 刘向宁 | Light emitting diode adjusts stream drive circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130717 Termination date: 20170226 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |