CN202634852U - Linear constant-current LED (light-emitting diode) driver - Google Patents
Linear constant-current LED (light-emitting diode) driver Download PDFInfo
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- CN202634852U CN202634852U CN 201220316404 CN201220316404U CN202634852U CN 202634852 U CN202634852 U CN 202634852U CN 201220316404 CN201220316404 CN 201220316404 CN 201220316404 U CN201220316404 U CN 201220316404U CN 202634852 U CN202634852 U CN 202634852U
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Abstract
The utility model discloses a linear constant-current LED (light-emitting diode) driver. The linear constant-current LED driver comprises a rectifier, a light-emitting diode group and a constant-current controller which are sequentially connected, wherein the light-emitting diode group comprises a plurality of light-emitting diodes connected in series, the constant-current controller comprises a second resistor, a third resistor, a first triode, a second triode, a fourth voltage stabilizing tube and a fifth voltage stabilizing tube, the output end of the light-emitting diode group is connected on a circuit between the fourth voltage stabilizing tube and the second resistor, a positive pole of the fourth voltage stabilizing tube is connected with a base of the first triode, a collector of the second triode is connected with the circuit between the fourth voltage stabilizing tube and the base of the first triode, a negative pole of the fifth voltage stabilizing tube is connected with the circuit between the base of the second triode and the collector of the first triode, and the two ends of the third resistor are respectively connected with the circuit between the positive pole of the fifth voltage stabilizing tube and an emitter of the second triode. When the linear constant-current LED driver is applied, the constant-current driver can ensure that current on the circuit is stable, thereby preventing the light-emitting diodes from being damaged when voltage changes.
Description
Technical field
The utility model relates to lighting apparatus, specifically is the led driver of linear constant current.
Background technology
Along with the development of society, requiring of people's illumination equipment is increasingly high, and operating voltage is low, light efficiency is high because of LED has, so the research of LED and using more and more widely.Electrology characteristic by LED can be known; The mean forward current of LED is along with the increase of forward voltage presents significantly linear growth; The change of LED its forward voltage behind forward conduction will cause the LED very big variation of stream that powers on; And electric current is very big to the influence of LED junction temperature, and excessive electric current is easy to cause LED to damage because of junction temperature raises.LED can damage because of the change of voltage, and this has just had influence on applying of LED lighting.
The utility model content
The purpose of the utility model is to overcome the deficiency of prior art, and a kind of led driver of the linear constant current that LED damages because of the change of voltage can avoid the supply power voltage change time is provided.
The purpose of the utility model mainly realizes through following technical scheme: the led driver of linear constant current; Comprise the rectifier, light-emitting diode group and the constant-current controller that connect successively; Said light-emitting diode group comprises the light-emitting diode of a plurality of series connection, and all is parallel with the voltage-stabiliser tube of a reversal connection on each light-emitting diode in the light-emitting diode group; Said constant-current controller comprises second resistance, the 3rd resistance, first triode, second triode, the 4th voltage-stabiliser tube and the 5th voltage-stabiliser tube; The two ends of said second resistance are connected with the emitter of the 4th voltage-stabiliser tube negative pole and first triode respectively; The output of said light-emitting diode group is connected on the circuit between the 4th voltage-stabiliser tube and second resistance; The positive pole of the 4th voltage-stabiliser tube is connected with the base stage of first triode; The collector electrode of second triode is connected with circuit between the 4th voltage-stabiliser tube and first transistor base; Second transistor base is connected with first transistor collector; The negative pole of the 5th voltage-stabiliser tube is connected with circuit between second transistor base and first transistor collector, and the circuit between anodal with the 5th voltage-stabiliser tube respectively and second transistor emitter in said the 3rd resistance two ends is connected, and is connected with earth connection on the line between the 3rd resistance and the 5th voltage-stabiliser tube.
Said rectifier comprises rectification unit, first electric capacity and rectifier diode; Said rectification unit is provided with two inputs and two outputs; Be connected with first resistance on the input of rectification unit; Be connected with light-emitting diode group behind the output series connection rectifier diode of rectification unit, be connected with earth connection on another output of rectification unit, the two ends of said first electric capacity are connected on two outputs of rectification unit.The utility model is when using, and two inputs of rectification unit receive the input of supply power voltage.
Said rectification unit is a bridge rectifier.
Because of thermistor its resistance when voltage increases increases, thereby can produce overcurrent protection, as preferably, said first resistance is thermistor.
Said first triode is the PNP triode, and second triode is the NPN triode.
Compared with prior art, the utlity model has following beneficial effect: the utility model comprises rectifier, light-emitting diode group and constant-current controller, wherein; Constant-current controller comprises second resistance, the 3rd resistance, first triode, second triode, the 4th voltage-stabiliser tube and the 5th voltage-stabiliser tube, and the utility model overall structure is simple, and volume is little; Be convenient to realize that cost is low, the utility model is when using; Second resistance, first triode and the 4th voltage-stabiliser tube constitute a constant-current source in the constant-current controller; This constant-current source provides stable operating current for the 5th voltage-stabiliser tube, and it is the constant-current source that the 4th voltage-stabiliser tube provides the steady operation electric current that second triode, the 3rd resistance and the 5th voltage-stabiliser tube constitute one, stablizes the other side's voltage-stabiliser tube working point mutually owing to two constant-current sources; Thereby the total current that flows through on the constant-current controller is no longer changed; Operating current is constant in the light-emitting diode group, and so the electric current of every light-emitting diode is identical in the light-emitting diode group, obtains uniform brightness; Light-emitting diode can not damage because of change in voltage, is convenient to applying of LED lighting apparatus.
Description of drawings
Fig. 1 is the structural representation of the utility model embodiment.
The pairing name of Reference numeral is called in the accompanying drawing: 1-rectification unit, R1-first resistance, R2-second resistance, R3-the 3rd resistance; C1-first electric capacity, D1-rectifier diode, Q1-first triode, Q2-second triode; LED1-first light-emitting diode, LED2-second light-emitting diode, LED3-the 3rd light-emitting diode, DW1-first voltage-stabiliser tube; DW2-second voltage-stabiliser tube, DW3-the 3rd voltage-stabiliser tube, DW4-the 4th voltage-stabiliser tube, DW5-the 5th voltage-stabiliser tube.
Embodiment
Below in conjunction with embodiment and accompanying drawing the utility model is done further to specify, but the execution mode of the utility model is not limited thereto.
Embodiment:
As shown in Figure 1, the led driver of linear constant current comprises the rectifier, light-emitting diode group and the constant-current controller that connect successively; Wherein, rectifier comprises rectification unit 1, first capacitor C 1 and rectifier diode D1, and rectification unit 1 is a bridge rectifier; Rectification unit 1 is provided with two inputs and two outputs; Two inputs of rectification unit 1 receive the input of supply power voltage, are connected with first resistance R, 1, the first resistance R, the 1 preferred thermistor that adopts on the input of rectification unit 1.Be connected with light-emitting diode group behind the output series connection rectifier diode D1 of rectification unit 1, be connected with earth connection on another output of rectification unit 1, the two ends of first capacitor C 1 are connected on two outputs of rectification unit 1.Light-emitting diode group comprises the light-emitting diode of a plurality of series connection, and all is parallel with the voltage-stabiliser tube of a reversal connection on each light-emitting diode in the light-emitting diode group.Be provided with three light-emitting diodes in the present embodiment; Three light-emitting diodes are respectively the first voltage-stabiliser tube DW1, the second voltage-stabiliser tube DW2 and the 3rd voltage-stabiliser tube DW3 that is parallel with reversal connection on first LED 1, second LED 2 and 3, three light-emitting diodes of the 3rd LED respectively.
Constant-current controller comprises second resistance R 2, the 3rd resistance R 3, the first triode Q1, the second triode Q2, the 4th voltage-stabiliser tube DW4 and the 5th voltage-stabiliser tube DW5, and wherein, the first triode Q1 is the PNP triode, and the second triode Q2 is the NPN triode.The two ends of second resistance R 2 are connected with the emitter of the 4th voltage-stabiliser tube DW4 negative pole and the first triode Q1 respectively, and the output of light-emitting diode group is connected on the circuit between the 4th voltage-stabiliser tube DW4 and second resistance R 2.The positive pole of the 4th voltage-stabiliser tube DW4 is connected with the base stage of the first triode Q1, and the collector electrode of the second triode Q2 is connected with circuit between the 4th voltage-stabiliser tube DW4 and the first triode Q1 base stage.The second triode Q2 base stage is connected with the first triode Q1 collector electrode, and the negative pole of the 5th voltage-stabiliser tube DW5 is connected with circuit between the second triode Q2 base stage and the first triode Q1 collector electrode.Circuit between anodal with the 5th voltage-stabiliser tube the DW5 respectively and second triode Q2 emitter in the 3rd resistance R 3 two ends is connected, and is connected with earth connection on the line between the 3rd resistance R 3 and the 5th voltage-stabiliser tube DW5.
As stated, then can well realize the utility model.
Claims (5)
1. the led driver of linear constant current; It is characterized in that: comprise the rectifier, light-emitting diode group and the constant-current controller that connect successively; Said light-emitting diode group comprises the light-emitting diode of a plurality of series connection, and all is parallel with the voltage-stabiliser tube of a reversal connection on each light-emitting diode in the light-emitting diode group; Said constant-current controller comprises second resistance (R2), the 3rd resistance (R3), first triode (Q1), second triode (Q2), the 4th voltage-stabiliser tube (DW4) and the 5th voltage-stabiliser tube (DW5); The two ends of said second resistance (R2) are connected with the emitter of the 4th voltage-stabiliser tube (DW4) negative pole and first triode (Q1) respectively; The output of said light-emitting diode group is connected on the circuit between the 4th voltage-stabiliser tube (DW4) and second resistance (R2); The positive pole of the 4th voltage-stabiliser tube (DW4) is connected with the base stage of first triode (Q1); The collector electrode of second triode (Q2) is connected with circuit between the 4th voltage-stabiliser tube (DW4) and first triode (Q1) base stage; Second triode (Q2) base stage is connected with first triode (Q1) collector electrode; The negative pole of the 5th voltage-stabiliser tube (DW5) is connected with circuit between second triode (Q2) base stage and first triode (Q1) collector electrode; Circuit between anodal with the 5th voltage-stabiliser tube (DW5) respectively and second triode (Q2) emitter in said the 3rd resistance (R3) two ends is connected, and is connected with earth connection on the line between the 3rd resistance (R3) and the 5th voltage-stabiliser tube (DW5).
2. the led driver of linear constant current according to claim 1; It is characterized in that: said rectifier comprises rectification unit (1), first electric capacity (C1) and rectifier diode (D1); Said rectification unit (1) is provided with two inputs and two outputs; Be connected with first resistance (R1) on the input of rectification unit (1); An output series connection rectifier diode (D1) back of rectification unit (1) is connected with light-emitting diode group, is connected with earth connection on another output of rectification unit (1), and the two ends of said first electric capacity (C1) are connected on two outputs of rectification unit (1).
3. the led driver of linear constant current according to claim 2, it is characterized in that: said rectification unit (1) is a bridge rectifier.
4. the led driver of linear constant current according to claim 2, it is characterized in that: said first resistance (R1) is thermistor.
5. according to the led driver of described any the linear constant current of claim 1～4, it is characterized in that: said first triode (Q1) is the PNP triode, and second triode (Q2) is the NPN triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220316404 CN202634852U (en) | 2012-07-03 | 2012-07-03 | Linear constant-current LED (light-emitting diode) driver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220316404 CN202634852U (en) | 2012-07-03 | 2012-07-03 | Linear constant-current LED (light-emitting diode) driver |
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| Publication Number | Publication Date |
|---|---|
| CN202634852U true CN202634852U (en) | 2012-12-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220316404 Expired - Fee Related CN202634852U (en) | 2012-07-03 | 2012-07-03 | Linear constant-current LED (light-emitting diode) driver |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103280054A (en) * | 2013-05-30 | 2013-09-04 | 成都荣耀科技有限公司 | Transformer anti-theft system of low-voltage electric power circuit |
| CN103533697A (en) * | 2012-07-03 | 2014-01-22 | 成都市宏山科技有限公司 | Linear constant-current LED driver |
-
2012
- 2012-07-03 CN CN 201220316404 patent/CN202634852U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103533697A (en) * | 2012-07-03 | 2014-01-22 | 成都市宏山科技有限公司 | Linear constant-current LED driver |
| CN103280054A (en) * | 2013-05-30 | 2013-09-04 | 成都荣耀科技有限公司 | Transformer anti-theft system of low-voltage electric power circuit |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121226 Termination date: 20130703 |