CN205454159U - LED constant current drive control circuit that anti temperature is floated - Google Patents
LED constant current drive control circuit that anti temperature is floated Download PDFInfo
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- CN205454159U CN205454159U CN201620016166.7U CN201620016166U CN205454159U CN 205454159 U CN205454159 U CN 205454159U CN 201620016166 U CN201620016166 U CN 201620016166U CN 205454159 U CN205454159 U CN 205454159U
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Abstract
The utility model relates to a LED constant current drive control circuit that anti temperature is floated, including constant voltage control circuit, constant current control circuit and difference control circuit, the constant voltage control circuit connection of passing through voltage source, a PNP type triode and second resistance constitute, constant current control circuit through first resistance second resistance, the 2nd PNP type triode and the connection of voltage source constitutes, difference control circuit pass through the connection of a PNP type triode and the 2nd PNP type triode constitute, a PNP type triode and the 2nd PNP type triode be the same specification and the double -triode valve device of encapsulation altogether. The utility model discloses a no matter how ambient temperature changes control circuit, can both export invariable LED drive current, thereby it receives ambient temperature to influence the problem of the great LED of influence luminance to solve the LED drive current of present constant current drive control circuit output.
Description
Technical field
This utility model relates to the Drive Control Technique of LED, and the LED constant current being specifically related to the drift of a kind of temperature resistance drives control circuit.
Background technology
Light emitting diode (LED) is the most universal in the application of automobile tail light, they can braking automobile, reverse end for end or turn to time send signal to other vehicles and pedestrian.LED taillight has the outstanding intensity of light source, even if also can keep high visibility in the greasy weather.
Compared with conventional lamp, it is the most of paramount importance advantage that LED has a series of technical advantage, extremely short response time and longer service life.See that the brake lamp of front automobile contributes to reducing the stopping distance of driver in time.Such as, when under equal conditions braking with the speed of 100 kilometers/hour, see that the brake lamp of front automobile can make the stopping distance of driver reduce about 5.5 meters in time.
In the most linear LED constant-current control circuit, be most commonly used that transistor as major loop constant current device, but when variation of ambient temperature, the PN pole of transistor can be changed along with the change of temperature, the final output electric current affecting constant-current circuit, thus have impact on the brightness of LED.
Utility model content
The purpose of this utility model is to provide the LED constant current of a kind of temperature resistance drift and drives control circuit, no matter how ambient temperature changes described control circuit, LED drive current invariable, not temperature influence can be exported, in order to solve current constant-current driving control circuit owing to using transistor as major loop constant current device, when variation of ambient temperature, the problem that LED luminance can be affected.
nullFor achieving the above object，Scheme of the present utility model is: the LED constant current of a kind of temperature resistance drift drives control circuit，Described LED constant current drives control circuit to include constant-voltage control circuit、Constant-current control circuit and difference control circuit，Described constant-voltage control circuit is by voltage source、Connecting and composing of first PNP type triode and the second resistance，Described constant-current control circuit is by the first resistance、Described second resistance、Connecting and composing of second PNP type triode and described voltage source，Described difference control circuit is connected and composed by the first described PNP type triode and the second PNP type triode，The first described PNP type triode and the second PNP type triode are same specification，And the double-triode valve device of encapsulation altogether，In order to ensure the concordance of two PNP type triode parameters and ambient temperature constant unanimously.
Whole control circuit of the present utility model can ensure that no matter how ambient temperature and input voltage change, and can export LED drive current invariable, not temperature influence.
Further, control circuit is driven according to the LED constant current that temperature resistance described in the utility model floats, in described constant-voltage control circuit, the positive pole of voltage source connects power end, the negative pole of voltage source connects the emitter and collector of the first PNP type triode, and the base stage of described first PNP type triode passes through the second resistance eutral grounding.
Further, control circuit is driven according to the LED constant current that temperature resistance described in the utility model floats, in described constant-current control circuit, one end of described first resistance is connected to the positive pole of voltage source, the other end of described first resistance connects the emitter stage of the second PNP type triode, the colelctor electrode of described second PNP type triode connects LED, and the base stage of described second PNP type triode passes through the second resistance eutral grounding.
Further, driving control circuit according to the LED constant current that temperature resistance described in the utility model floats, in described difference control circuit, the base stage of described first PNP type triode and the second PNP type triode connects.
The beneficial effect that this utility model reaches: no matter how ambient temperature changes control circuit of the present utility model, can export LED drive current invariable, not temperature influence, and LED luminance will not be affected because of variation of ambient temperature.
Accompanying drawing explanation
Fig. 1 is constant current driver circuit for LED schematic diagram of the present utility model.
Detailed description of the invention
With specific embodiment, this utility model is described in further detail below in conjunction with the accompanying drawings.
LED constant current described in the utility model drives control circuit to include constant-voltage control circuit, constant-current control circuit and difference control circuit.Constant-voltage control circuit and constant-current control circuit, in order to ensure in circuit, no matter how input voltage changes, can export invariable LED drive current, and difference control circuit ensures that the PN junction of transistor is not affected by ambient temperature.Whole control circuit can ensure that no matter how ambient temperature and input voltage change, and can export LED drive current invariable, not temperature influence.
As shown in Figure 1, voltage source V1, the first PNP type triode T1 and the second resistance R2 constitute constant-voltage control circuit, in described constant-voltage control circuit, the positive pole of voltage source V1 connects power end Vin, input for voltage, the negative pole of voltage source V1 connects the emitter and collector of the first PNP type triode T1, and the base stage of described first PNP type triode T1 passes through the second resistance R2 ground connection.
First resistance R1, the second resistance R2, the second PNP type triode T2 and voltage source V1 constitute constant-current control circuit, in described constant-current control circuit, one end of described first resistance R1 is connected to the positive pole of voltage source V1, the other end of described first resistance R1 connects the emitter stage of the second PNP type triode T2, the colelctor electrode of described second PNP type triode T2 connects LED, and the base stage of described second PNP type triode T2 passes through the second resistance R2 ground connection.
First PNP type triode T1 and the second PNP type triode T2 connect and compose difference control circuit, and in described difference control circuit, the base stage of described first PNP type triode T1 and the second PNP type triode T1 connects.The first described PNP type triode T1 and the second PNP type triode T2 are same specification, and the double-triode valve device of altogether encapsulation, in order to ensure the concordance of two triode parameters and ambient temperature constant unanimously.
In circuit shown in Fig. 1, no matter how input voltage changes, node voltage VAB=VAC+VCB, equally, node voltage VAB=VAD+VDB, the wherein PN junction voltage V of same specification the first PNP type triode T1 and the second PNP type triode T2CB=VBD, therefore VAC=VAD, thus learn:
ILED≈I1=VAC/R1
Owing to the PN junction of transistor can change with variation of ambient temperature, T1, T2 are used same specification and share the double-triode valve device of same encapsulation by this utility model, and the most no matter how ambient temperature changes, VCBTotal energy and VDBIdentical, thus cancel out each other, to ensure VAC=CAD。
No matter how ambient temperature changes control circuit of the present utility model, can export LED drive current invariable, not temperature influence, and LED luminance will not be affected because of variation of ambient temperature.
Claims (4)
1. the LED constant current of a temperature resistance drift drives control circuit, it is characterized in that: described LED constant current drives control circuit to include constant-voltage control circuit, constant-current control circuit and difference control circuit, described constant-voltage control circuit is by voltage source, connecting and composing of first PNP type triode and the second resistance, described constant-current control circuit is by the first resistance, described second resistance, connecting and composing of second PNP type triode and described voltage source, described difference control circuit is connected and composed by the first described PNP type triode and the second PNP type triode, the first described PNP type triode and the second PNP type triode are same specification, and the double-triode valve device of encapsulation altogether.
The LED constant current of temperature resistance the most according to claim 1 drift drives control circuit, it is characterized in that, in described constant-voltage control circuit, the positive pole of voltage source connects power end, the negative pole of voltage source connects the emitter and collector of the first PNP type triode, and the base stage of described first PNP type triode passes through the second resistance eutral grounding.
The LED constant current of temperature resistance the most according to claim 1 drift drives control circuit, it is characterized in that, in described constant-current control circuit, one end of described first resistance is connected to the positive pole of voltage source, the other end of described first resistance connects the emitter stage of the second PNP type triode, the colelctor electrode of described second PNP type triode connects LED, and the base stage of described second PNP type triode passes through the second resistance eutral grounding.
The LED constant current of temperature resistance the most according to claim 1 drift drives control circuit, it is characterised in that in described difference control circuit, and the base stage of described first PNP type triode and the second PNP type triode connects.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620016166.7U CN205454159U (en) | 2016-01-08 | 2016-01-08 | LED constant current drive control circuit that anti temperature is floated |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620016166.7U CN205454159U (en) | 2016-01-08 | 2016-01-08 | LED constant current drive control circuit that anti temperature is floated |
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| CN205454159U true CN205454159U (en) | 2016-08-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201620016166.7U Active CN205454159U (en) | 2016-01-08 | 2016-01-08 | LED constant current drive control circuit that anti temperature is floated |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108092579A (en) * | 2017-12-24 | 2018-05-29 | 佛山中锦微电科技有限公司 | A kind of two-way continuously adjustable control circuit of temperature drift coefficient and voltage regulator |
-
2016
- 2016-01-08 CN CN201620016166.7U patent/CN205454159U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108092579A (en) * | 2017-12-24 | 2018-05-29 | 佛山中锦微电科技有限公司 | A kind of two-way continuously adjustable control circuit of temperature drift coefficient and voltage regulator |
| CN108092579B (en) * | 2017-12-24 | 2020-12-11 | 西安智财全技术转移中心有限公司 | Control circuit with temperature drift coefficient capable of being continuously adjusted in two directions and voltage regulator |
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Legal Events
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 201800 Yecheng Road, Jiading District, Jiading District, Shanghai Patentee after: Hua Yu vision technology (Shanghai) Co., Ltd. Address before: 201800 Yecheng Road, Jiading District, Jiading District, Shanghai Patentee before: Xiaoxi Car Lights Co., Ltd., Shanghai |
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| CP01 | Change in the name or title of a patent holder |