CN204014184U - A kind of drive circuit of LED traffic lights - Google Patents
A kind of drive circuit of LED traffic lights Download PDFInfo
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- CN204014184U CN204014184U CN201420324809.5U CN201420324809U CN204014184U CN 204014184 U CN204014184 U CN 204014184U CN 201420324809 U CN201420324809 U CN 201420324809U CN 204014184 U CN204014184 U CN 204014184U
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Abstract
The utility model discloses a kind of drive circuit of LED traffic lights, comprise the power supply unit, rectification unit, filter unit, display unit, the voltage regulation unit that connect successively, adopt the display unit circuit connected mode of this scheme, make the drive circuit of LED traffic lights simpler, general, application is extensive, cost-saving.Voltage regulation unit adopts three-terminal voltage-stabilizing chip, and is positioned at the end of circuit, makes the supply power voltage of display unit more stable, avoids voltage instability to cause the impact to LED lamp, has extended the useful life of LED lamp.
Description
Technical field
The utility model belongs to the technical field of traffic lights application, is specifically related to a kind of drive circuit of LED traffic lights.
Background technology
Along with the fast development of LED industry, wafer technologies and packaging technology all reach its maturity, the luminous light efficiency of LED is greatly improved, photoelectric properties are also stable before, and the development cost of product and manufacturing expense are also significantly Xiaed Jiang ﹐ and are caused the LED market source of goods abundant, moderate cost, thus the high volume applications of LED road traffic signal lamp also impelled.The light source the most generally adopting in conventional light source signal lamp be incandescent lamp and halogen element lamp ﹐ if the technical indicator in China signal lamp standard GB14887-94 and Australian Standard AS2144 is mainly for incandescent light source regulation, and Britain and China Hongkong in the past the BS505 standard of use formulate for Halogen lamp LED.
The essential association of the essential association of LED: LED generally has Chuan Lian ﹑ in parallel and intersect three kinds of Chuan ﹑ connect in parallel, because LED itself is a kind of discreteness electronic devices and components, Vf (voltage drop at LED two ends is Vf in the time of the certain forward current conducting) characteristic of its each LEDs lamp has small difference, therefore when LED direct current driven, it is the optimum state of its application that constant current drives.And adopt when pulsed drive as LED, it has: constant current is accurate, and luminous efficiency is high, and the heat sending when positive pulse work can be dispersed in the time of negative pulse, thereby has effectively extended the advantage such as useful life of LED.But its shortcoming is control circuit complexity, and cost is higher, it is the new-type circuit of promoting in industry.
Therefore the drive circuit that, designs a kind of general LED traffic lights just seems particularly important.
Summary of the invention
Technical problem to be solved in the utility model is: the drive circuit that a kind of LED traffic lights are provided, comprise the power supply unit, rectification unit, filter unit, display unit, the voltage regulation unit that connect successively, voltage regulation unit is positioned at the end of circuit, solved existing LED traffic lights because voltage instability holds flimsy problem.
The utility model is for solving the problems of the technologies described above by the following technical solutions:
A kind of drive circuit of LED traffic lights, comprise the power supply unit connecting successively, rectification unit, filter unit, display unit, voltage regulation unit, described power supply unit comprises transformer, described rectification unit comprises the rectifier bridge of first to fourth diode composition, described display unit comprises multiple luminous branch roads, each luminous branch road is composed in series successively by multiple light-emitting diodes and multiple resistance, wherein between light-emitting diode, pass through resistive isolation, described voltage regulation unit is arranged at the least significant end of this circuit, comprise a three-terminal voltage-stabilizing chip, a polar capacitor, the input of described three-terminal voltage-stabilizing chip connects the output of display unit, the output of three-terminal voltage-stabilizing chip is connected with rectification unit negative pole of output end by the first resistance, second resistance of connecting between the earth terminal of described three-terminal voltage-stabilizing chip and output, between the input of three-terminal voltage-stabilizing chip and output, be connected the parallel circuits of polar capacitor and the 3rd resistance.
Described voltage stabilizing circuit comprises the first electric capacity, the second electric capacity, inductance, the first resistance; The positive pole of described filter circuit output connects respectively the positive pole of the first electric capacity, one end of inductance; The other end of inductance respectively with the input of display circuit, one end of the second electric capacity connects; The negative pole of filter circuit output is connected with the negative pole of the first electric capacity, one end of the first resistance respectively; The other end of the first resistance is connected with the other end of the second electric capacity.
Described the first electric capacity is polar capacitor, and capacity is 100uF, and withstand voltage is 50V; The capacity of the second electric capacity is 10uF, and withstand voltage is 50V.
Described the first resistance is 100 Europe.
Described three-terminal voltage-stabilizing chip is 78L18.
Compared with prior art, the utlity model has following beneficial effect:
1, adopt the display unit circuit connected mode of this scheme, make the drive circuit of LED traffic lights simpler, general, application is extensive, cost-saving.
2, voltage regulation unit adopts three-terminal voltage-stabilizing chip, and is positioned at the end of circuit, makes the supply power voltage of display unit more stable, avoids voltage instability to cause the impact to LED lamp, has extended the useful life of LED lamp.
Brief description of the drawings
Fig. 1 is traffic light circuit figure of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, structure of the present utility model and the course of work are described further.
As shown in Figure 1, a kind of drive circuit of LED traffic lights, comprise the power supply unit connecting successively, rectification unit, filter unit, display unit, voltage regulation unit, described power supply unit comprises transformer, described rectification unit comprises diode D1, D2, D3, the rectifier bridge of D4 composition, described display unit comprises multiple luminous branch roads, each luminous branch road is composed in series successively by multiple light-emitting diodes and multiple resistance, wherein between light-emitting diode, pass through resistive isolation, as shown in the figure, the connected mode of each branch road all adopts the LED lamp of connecting after a resistance, series resistance again, the cascade system that LED lamp is such, described voltage regulation unit is arranged at the least significant end of this circuit, comprise a three-terminal voltage-stabilizing chip U1, a polar capacitor C2, the input of described three-terminal voltage-stabilizing chip U2 connects the output of display unit, the output of three-terminal voltage-stabilizing chip U1 is connected with rectification unit negative pole of output end by the first resistance R 1, second resistance R 7 of connecting between the earth terminal of described three-terminal voltage-stabilizing chip U1 and output, between the input of three-terminal voltage-stabilizing chip U1 and output, be connected the parallel circuits of polar capacitor C2 and the 3rd resistance R 6.
Adopt the display unit circuit connected mode of this scheme, make the drive circuit of LED traffic lights simpler, general, application is extensive, cost-saving.
Described voltage stabilizing circuit comprises the first capacitor C 1, the second capacitor C 4, inductance L 1, the first resistance R 1; The positive pole of described filter circuit output connects respectively the positive pole of the first capacitor C 1, one end of inductance L 1; The other end of inductance L 1 respectively with the input of display circuit, one end of the second capacitor C 4 connects; The negative pole of filter circuit output is connected with the negative pole of the first capacitor C 1, one end of the first resistance R 1 respectively; The other end of the first resistance R 1 is connected with the other end of the second capacitor C 4.
Described the first capacitor C 1 is polar capacitor, and capacity is 100uF, and withstand voltage is 50V; The capacity of the second capacitor C 4 is 10uF, and withstand voltage is 50V.
Described the first resistance is 100 Europe.
Described three-terminal voltage-stabilizing chip U1 is 78L18.
Voltage regulation unit adopts three-terminal voltage-stabilizing chip, and is positioned at the end of circuit, makes the supply power voltage of display unit more stable, avoids voltage instability to cause the impact to LED lamp, has extended the useful life of LED lamp.
Claims (5)
1. the drive circuit of LED traffic lights, comprise the power supply unit connecting successively, rectification unit, filter unit, display unit, voltage regulation unit, described power supply unit comprises transformer, described rectification unit comprises the rectifier bridge of first to fourth diode composition, described display unit comprises multiple luminous branch roads, each luminous branch road is composed in series successively by multiple light-emitting diodes and multiple resistance, wherein between light-emitting diode, pass through resistive isolation, it is characterized in that: described voltage regulation unit is arranged at the least significant end of this circuit, comprise a three-terminal voltage-stabilizing chip, a polar capacitor, the input of described three-terminal voltage-stabilizing chip connects the output of display unit, the output of three-terminal voltage-stabilizing chip is connected with rectification unit negative pole of output end by the first resistance, second resistance of connecting between the earth terminal of described three-terminal voltage-stabilizing chip and output, between the input of three-terminal voltage-stabilizing chip and output, be connected the parallel circuits of polar capacitor and the 3rd resistance.
2. the drive circuit of LED traffic lights according to claim 1, is characterized in that: described voltage stabilizing circuit comprises the first electric capacity, the second electric capacity, inductance, the first resistance; The positive pole of described filter circuit output connects respectively the positive pole of the first electric capacity, one end of inductance; The other end of inductance respectively with the input of display circuit, one end of the second electric capacity connects; The negative pole of filter circuit output is connected with the negative pole of the first electric capacity, one end of the first resistance respectively; The other end of the first resistance is connected with the other end of the second electric capacity.
3. the drive circuit of LED traffic lights according to claim 2, is characterized in that: described the first electric capacity is polar capacitor, and capacity is 100uF, and withstand voltage is 50V; The capacity of the second electric capacity is 10uF, and withstand voltage is 50V.
4. the drive circuit of LED traffic lights according to claim 2, is characterized in that: described the first resistance is 100 Europe.
5. according to the drive circuit of the LED traffic lights described in any one in claim 1 to 4, it is characterized in that: described three-terminal voltage-stabilizing chip is 78L18.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420324809.5U CN204014184U (en) | 2014-06-18 | 2014-06-18 | A kind of drive circuit of LED traffic lights |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420324809.5U CN204014184U (en) | 2014-06-18 | 2014-06-18 | A kind of drive circuit of LED traffic lights |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204014184U true CN204014184U (en) | 2014-12-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420324809.5U Expired - Fee Related CN204014184U (en) | 2014-06-18 | 2014-06-18 | A kind of drive circuit of LED traffic lights |
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| Country | Link |
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| CN (1) | CN204014184U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104023448A (en) * | 2014-06-18 | 2014-09-03 | 无锡市崇安区科技创业服务中心 | Driving circuit of LED traffic signal lamp |
-
2014
- 2014-06-18 CN CN201420324809.5U patent/CN204014184U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104023448A (en) * | 2014-06-18 | 2014-09-03 | 无锡市崇安区科技创业服务中心 | Driving circuit of LED traffic signal lamp |
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| Date | Code | Title | Description |
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| 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: 20141210 Termination date: 20150618 |
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| EXPY | Termination of patent right or utility model |