CN203407049U - LED drive circuit - Google Patents
LED drive circuit Download PDFInfo
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- CN203407049U CN203407049U CN201320479287.1U CN201320479287U CN203407049U CN 203407049 U CN203407049 U CN 203407049U CN 201320479287 U CN201320479287 U CN 201320479287U CN 203407049 U CN203407049 U CN 203407049U
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- compensation unit
- current compensation
- current
- led
- rectifier
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Abstract
The utility model provides an LED drive circuit. The LED drive circuit comprises a first AC receiving end, a second AC receiving end, a rectifier, a linear constant current module and a load, wherein the rectifier includes two input terminals and two output terminals, the two input terminals are respectively connected to the first AC receiving end and the second AC receiving end, the linear constant current module includes at least one current compensation unit, and the at least one current compensation unit and the load are in series connection between two output terminals of the rectifier.
Description
Technical field
The utility model relates to lamp source Driving technique, especially, relates to a kind of light-emitting diode (Light Emitting Diode, LED) drive circuit.
Background technology
LED lamp source, owing to having the advantages such as volume low power consumption is low, is applied to illuminator more and more widely.LED lamp source, because needs adopt lower driving DC voltage, therefore cannot directly connect AC power, but need to adopt driving power.Existing LED driving power mostly adopts Switching Power Supply to carry out pressure-stabilizing constant flow driving, described Switching Power Supply mostly need to adopt high withstand voltage electrochemical capacitor device as filtering device when converting AC power to constant current driving voltage, and described electrochemical capacitor is subject to the heat effects of distributing in the work of LED lamp source, it is easily breakdown because of electrolyte dry-out, thereby affects the useful life of LED driving power.
Utility model content
In view of the above problems, the utility model provides a kind of useful life longer LED drive circuit.
The LED drive circuit that the utility model provides, comprise that the first interchange receiving terminal, second exchanges receiving terminal, rectifier, linear constant flow module and load, wherein said rectifier comprises two inputs and two outputs, described two inputs are connected respectively to described the first interchange receiving terminal and exchange receiving terminal with described second, described linear constant flow module comprises at least one current compensation unit, and described at least one current compensation unit and described load are connected between two outputs of described rectifier.
In a kind of preferred embodiment of LED drive circuit providing at the utility model, described load comprises the light-emitting diode of a plurality of mutual series connection.
In a kind of preferred embodiment of LED drive circuit providing at the utility model, described at least one current compensation unit comprises current compensator, the first resistance and the second resistance, wherein said current compensator comprises input, output and feedback end, the input of wherein said current compensator is connected to one of them output of described rectifier, and be connected to described feedback end by described the first resistance, the output of described current compensator is connected to described load, and is connected to described feedback end by described the second resistance.
In a kind of preferred embodiment of LED drive circuit providing at the utility model, described at least one current compensation unit comprises the first current compensation unit parallel with one another and the second current compensation unit.
In a kind of preferred embodiment of LED drive circuit providing at the utility model, described the first current compensation unit and described the second current compensation unit are connected between one of them output and described load of described rectifier.
In a kind of preferred embodiment of LED drive circuit providing at the utility model, described at least one current compensation unit comprises the first current compensation unit and the second current compensation unit of mutual series connection.
In a kind of preferred embodiment of LED drive circuit providing at the utility model, described the first current compensation unit and described the second current compensation unit are connected respectively to two outputs of described rectifier, and described load is connected between described the first current compensation unit and described the second current compensation unit.
In a kind of preferred embodiment of LED drive circuit providing at the utility model, described load comprises the light-emitting diode (LED) module of a plurality of mutual series connection, and each light-emitting diode (LED) module comprises the light-emitting diode of a plurality of mutual series connection.
In a kind of preferred embodiment of LED drive circuit providing at the utility model, described linear constant flow module also comprises a plurality of auxiliary current compensating units, wherein each auxiliary current compensating unit corresponds respectively to one of them LED module, and is connected in parallel on its corresponding LED module two ends.
Compared to prior art, the LED drive circuit that the utility model provides is directly converted to constant drive current by described linear constant flow module by the direct voltage of described rectifier output and comes driving LED lamp source, therefore do not need to adopt easily breakdown electrochemical capacitor device to carry out filtering, therefore, compared to prior art, the LED drive circuit that the utility model provides is longer useful life.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the utility model embodiment, below the accompanying drawing of required use during embodiment is described is briefly described, apparently, accompanying drawing in the following describes is only embodiment more of the present utility model, for those of ordinary skills, do not paying under the prerequisite of creative work, can also according to these accompanying drawings, obtain other accompanying drawing, wherein:
Fig. 1 is the circuit diagram of LED drive circuit the first embodiment of providing of the utility model.
Fig. 2 is the circuit diagram of LED drive circuit the second embodiment of providing of the utility model.
Fig. 3 is the circuit diagram of the third embodiment of LED drive circuit of providing of the utility model.
Fig. 4 is the circuit diagram of the 4th kind of embodiment of LED drive circuit that provide of the utility model.
Embodiment
Below the technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is only a part of embodiment of the present utility model, rather than whole embodiment.Embodiment based in the utility model, those of ordinary skills are not making all other embodiment that obtain under creative work prerequisite, all belong to the scope of the utility model protection.
Refer to Fig. 1, the circuit diagram of LED drive circuit the first embodiment that it provides for the utility model.Described LED drive circuit 100 can be applied in LED lamp source, is used for driving a plurality of LED.Described LED drive circuit 100 comprises that the first interchange receiving terminal 110, second exchanges receiving terminal 120, rectifier 130, linear constant flow module 140 and load 150.
Wherein, described first exchanges receiving terminal 110 exchanges receiving terminal 120 for receiving AC supply voltage with described second, such as 110V/220V civil power alternating voltage.Described rectifier 130 can comprise full bridge rectifier, it comprises two inputs and two outputs, described two inputs are connected respectively to described the first interchange receiving terminal 110 and exchange receiving terminal 120 with described second, described rectifier 130 can exchange receiving terminal 110 from described first to it and exchange the described AC supply voltage that receiving terminal 120 receives with described second and carry out rectification processing and obtain direct voltage, and by described direct voltage output to described linear constant flow module 140.
Described linear constant flow module 140 is connected to described load 150, and it can be converted to drive current by described direct voltage, and described drive current is offered to described load 150.In specific embodiment, described linear constant flow module 140 can comprise at least one current compensation unit 141, such as, in the embodiment shown in fig. 1, described linear constant flow module 140 comprises a current compensation unit.Described current compensation unit comprises current compensator 141, the first resistance 142 and the second resistance 143, and wherein said current compensator 141 comprises input 144, output 145 and feedback end 146.Described input 144 is connected to one of them output of described rectifier 131, and is connected to described feedback end 146 by described the first resistance 142; Described output 145 is connected to described load 150, and is connected to described feedback end 146 by described the second resistance 143.Described feedback end 146 can be sampled by the drive current of 143 pairs of described output 145 outputs of described the second resistance, described current compensator 141 can compensate described drive current according to the sampled result of described feedback end 146, thereby the stability of the drive current of described load 150 is exported in assurance.
Described load 150 can comprise the LED of a plurality of mutual series connection, and the LED of described a plurality of mutual series connection is connected between the output 145 of described current compensator 141 and another output of described rectifier 131.Described load 150 can output carry out under the driving of drive current of 145 outputs luminous.
The LED drive circuit 100 that the utility model provides is directly converted to constant drive current by described linear constant flow module 140 by the direct voltage of described rectifier 130 outputs and comes driving LED lamp source, therefore do not need to adopt easily breakdown electrochemical capacitor device to carry out filtering, therefore, compared to prior art, the LED drive circuit that the utility model provides is longer 100 useful lifes.On the other hand, described LED drive circuit 100 adopts parts less compared to Switching Power Supply, and circuit is simple and cost is lower, and easily accomplishes miniaturization and modularity.
Refer to Fig. 2, the circuit diagram of LED drive circuit the second embodiment that it provides for the utility model.Described LED drive circuit 200 is similar with the LED drive circuit 100 shown in Fig. 1, the main distinction is, the linear constant flow module of described LED drive circuit 200 comprises the first current compensation unit 241 and the second current compensation unit 242, the structure of wherein said the first current compensation unit 241 and described the second current compensation unit 242 can be identical with the current compensation cellular construction of described linear constant flow module 140, and described the first current compensation unit 241 and described the second current compensation unit 242 parallel with one another.Such as, described the first current compensation unit 241 and described the second current compensation unit 242 can be connected in parallel on wherein between one end of one of them output of rectifier 230 and load 250, and the other end of described load 250 is connected to another output of described rectifier 230.The linear constant flow module of the LED drive circuit 300 of the present embodiment adopts the first current compensation unit 341 parallel with one another and the second current compensation unit 342 can strengthen electric current supply, improves power output.
Refer to Fig. 3, the circuit diagram of the third embodiment of LED drive circuit that it provides for the utility model.Described LED drive circuit 300 is similar with the LED drive circuit 100 shown in Fig. 1, the main distinction is, the linear constant flow module of described LED drive circuit 300 comprises the first current compensation unit 341 and the second current compensation unit 342, the structure of wherein said the first current compensation unit 341 and described the second current compensation unit 342 can be identical with the current compensation cellular construction of described linear constant flow module 140, and described the first current compensation unit 341 and described the second current compensation unit 342 can and load 350 be connected between two outputs of rectifier 330.Such as, one end of described the first current compensation unit 341 and described the second current compensation unit 342 is connected respectively to two outputs of described rectifier 330, and described load 350 can be connected between described the first current compensation unit 341 and the other end of described the second current compensation unit 342.The linear constant flow module of the LED drive circuit 300 of the present embodiment adopts the first current compensation unit 341 and the second current compensation unit 342 of series connection mutually can increase withstand voltage supply, improves the anti-interference coefficient of described LED drive circuit 300.
Refer to Fig. 4, the circuit diagram of the 4th kind of embodiment of LED drive circuit that it provides for the utility model.Described LED drive circuit 400 is similar with the LED drive circuit 100 shown in Fig. 1, the main distinction is, the linear constant flow module of described LED drive circuit 400 is except comprising the first current compensation unit 441 and the second current compensation unit 442 of mutual series connection, also further comprise a plurality of auxiliary current compensating units 443, and the load 450 of described LED drive circuit 400 can comprise a plurality of LED modules 451, wherein each LED module 451 can comprise the LED of a plurality of mutual series connection.Described a plurality of LED module 451 is connected between described the first current compensation unit 441 and described the second current compensation unit 442 mutually, and described each auxiliary current compensating unit 443 corresponds respectively to one of them LED module 451, and be connected in parallel on its corresponding LED module 451 two ends.The linear constant flow module of the LED drive circuit 400 of the present embodiment increases described a plurality of auxiliary current compensating unit 443 on described the first current compensation unit 441 and 442 bases, the second current compensation unit, therefore not only can improve power output, can also increase withstand voltage supply, improve anti-interference coefficient.
The foregoing is only embodiment of the present utility model; not thereby limit the scope of the claims of the present utility model; every equivalent structure or conversion of equivalent flow process that utilizes the utility model description to do; or be directly or indirectly used in other relevant technical field, be all in like manner included in scope of patent protection of the present utility model.
Claims (9)
1. a LED driving circuit, it is characterized in that, comprise that the first interchange receiving terminal, second exchanges receiving terminal, rectifier, linear constant flow module and load, wherein said rectifier comprises two inputs and two outputs, described two inputs are connected respectively to described the first interchange receiving terminal and exchange receiving terminal with described second, described linear constant flow module comprises at least one current compensation unit, and described at least one current compensation unit and described load are connected between two outputs of described rectifier.
2. LED driving circuit according to claim 1, is characterized in that, described load comprises the light-emitting diode of a plurality of mutual series connection.
3. LED driving circuit according to claim 1, it is characterized in that, described at least one current compensation unit comprises current compensator, the first resistance and the second resistance, wherein said current compensator comprises input, output and feedback end, the input of wherein said current compensator is connected to one of them output of described rectifier, and be connected to described feedback end by described the first resistance, the output of described current compensator is connected to described load, and is connected to described feedback end by described the second resistance.
4. LED driving circuit according to claim 1, is characterized in that, described at least one current compensation unit comprises the first current compensation unit parallel with one another and the second current compensation unit.
5. LED driving circuit according to claim 4, is characterized in that, described the first current compensation unit and described the second current compensation unit are connected between one of them output and described load of described rectifier.
6. LED driving circuit according to claim 1, is characterized in that, described at least one current compensation unit comprises the first current compensation unit and the second current compensation unit of mutual series connection.
7. LED driving circuit according to claim 6, it is characterized in that, described the first current compensation unit and described the second current compensation unit are connected respectively to two outputs of described rectifier, and described load is connected between described the first current compensation unit and described the second current compensation unit.
8. LED driving circuit according to claim 7, is characterized in that, described load comprises the light-emitting diode (LED) module of a plurality of mutual series connection, and each light-emitting diode (LED) module comprises the light-emitting diode of a plurality of mutual series connection.
9. LED driving circuit according to claim 8, it is characterized in that, described linear constant flow module also comprises a plurality of auxiliary current compensating units, and wherein each auxiliary current compensating unit corresponds respectively to one of them LED module, and is connected in parallel on its corresponding LED module two ends.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320479287.1U CN203407049U (en) | 2013-08-07 | 2013-08-07 | LED drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320479287.1U CN203407049U (en) | 2013-08-07 | 2013-08-07 | LED drive circuit |
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| Publication Number | Publication Date |
|---|---|
| CN203407049U true CN203407049U (en) | 2014-01-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320479287.1U Expired - Fee Related CN203407049U (en) | 2013-08-07 | 2013-08-07 | LED drive circuit |
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| CN (1) | CN203407049U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015180675A1 (en) * | 2014-05-30 | 2015-12-03 | 欧普照明股份有限公司 | Constant-current drive circuit for light-emitting device and drive method therefor |
-
2013
- 2013-08-07 CN CN201320479287.1U patent/CN203407049U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015180675A1 (en) * | 2014-05-30 | 2015-12-03 | 欧普照明股份有限公司 | Constant-current drive circuit for light-emitting device and drive method therefor |
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| 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: 20140122 Termination date: 20160807 |
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| CF01 | Termination of patent right due to non-payment of annual fee |