CN201114894Y - A LED driving circuit - Google Patents
A LED driving circuit Download PDFInfo
- Publication number
- CN201114894Y CN201114894Y CNU2007201105557U CN200720110555U CN201114894Y CN 201114894 Y CN201114894 Y CN 201114894Y CN U2007201105557 U CNU2007201105557 U CN U2007201105557U CN 200720110555 U CN200720110555 U CN 200720110555U CN 201114894 Y CN201114894 Y CN 201114894Y
- Authority
- CN
- China
- Prior art keywords
- circuit
- constant
- output
- led
- current
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 239000003990 capacitor Substances 0.000 claims description 11
- 238000001914 filtration Methods 0.000 claims description 7
- 238000005070 sampling Methods 0.000 claims description 7
- 230000005611 electricity Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000005286 illumination Methods 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000000116 mitigating effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
Images
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The utility model relates to an LED drive circuit, comprising an AC/DC rectification circuit, a DC/DC constant-current circuit and a reactive circuit. An input end of the AC/DC rectification circuit is connected to 220V AC while an output end of the AC/DC rectification circuit is connected with a voltage input end of the DC/DC constant-current circuit; an output end of the DC/DC constant-current circuit drives an LED lighting source circuit; an input end of the reactive circuit is connected to the output end of the DC/DC constant-current circuit while an output end of the reactive circuit is connected with a return-signal input end of the DC/DC constant-current circuit. According to the technical proposal of the utility model, the LED drive circuit adopts a feedback control mode; when the voltage of the power supply fluctuates, the DC/DC constant-current circuit provides stable drive current for an LED luminescent tube so as to ensure the reliability of the circuit, stable working state of the LED and that the light output is stable without flickering thus improving the output efficiency of the LED light and prolonging the service life of the LED lamps.
Description
Technical field
The utility model relates to a kind of led drive circuit.
Background technology
Development along with the LED technology, the luminosity of LED has obtained increasing substantially, the particularly wherein successful exploitation of white light LEDs, and because little, the long service life of its power consumption, thermal radiation are little, luminous stable, the light-emitting component that makes it to begin as the normal lighting light fixture uses.
Present LED lighting device generally adopts the temporary lighting device or the Alternating Current Power Supply of direct current supply, but during direct current supply owing to need to use battery or storage battery, power supply cost is higher and can produce old and useless battery and pollute, and is not suitable for using at room lighting.And during Alternating Current Power Supply, because the electrical characteristics of LED, the light output of LED is proportional with drive current, higher to the power supply stability requirement, when using non-nominal current drives LED, can cause the output of LED light unstable, illuminating effect is not good, and be easy to damage, having reduced its useful life, this drive circuit is extremely important to the meaning of LED illumination.
Summary of the invention
The utility model is at deficiency of the prior art, provides that a kind of LED of making illumination is stable, reliability is high, use the long led drive circuit of giving orders.
In order to solve the problems of the technologies described above, the utility model is solved by following technical proposals:
A kind of led drive circuit comprises AC/DC rectification circuit, DC/DC constant-current circuit, feedback circuit; Described AC/DC rectification circuit input end is connected with the 220V alternating current, and its output is connected with described DC/DC constant-current circuit voltage input end; Described DC/DC constant-current circuit output driving LED circuit of light sources; Described feedback circuit input is connected with described DC/DC constant-current circuit output, and its output is connected with the feedback signal input of described DC/DC constant-current circuit.
As preferably, described AC/DC rectification circuit comprises transformer and rectification module: described transformer input is connected 220 alternating currents; Described rectification module comprises full-bridge rectifier and filter capacitor, the output of described filter capacitor cross-over connection full-bridge rectifier.
As preferably, described DC/DC constant-current circuit comprises switch power module, inverting model and filtration module: described switch power module is connected with the AC/DC rectification circuit output end respectively; Described inverting model comprises coil and rectifier diode, and described rectifier diode is anodal to be connected with coil input end, and is connected with a wherein output of switch power module, and described rectifier diode negative pole links to each other with the switch power module negative pole.
As preferably, described switch power module mainly is made of integrated chip.
As preferably, described feedback circuit comprises sampling resistor, and the output of the integrated chip in described sampling resistor and the DC/DC constant-current circuit 5. pin is connected, and uses and the led light source circuit constitutes the loop.
As preferably, described filtration module is a filter capacitor.
By the technical solution of the utility model, led drive circuit adopts feedback controling mode, when mains fluctuations, provide steady moving drive current by the DC/DC constant-current circuit for the LED luminous tube, guaranteed the reliability of circuit, made the stable working state of LED, light output is stable does not glimmer, improve the efficient of LED light output, prolonged the useful life of LED lamp.
Circuit output direct current of the present utility model, ripple ratio is low, good stability, this circuit can be taked overvoltage or overcurrent protection automatically when LED component wear open circuit or short circuit, avoid damaging circuit; When the LED element just often, this driver is restarted automatically, need not start shooting again; So this practical circuit reliability height, good stability.
Figure of description
Fig. 1 is the circuit theory sketch of present embodiment.
Fig. 2 is the circuit theory diagrams of present embodiment.
Embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is described in further detail:
Shown in Fig. 1, accompanying drawing 2, a kind of led drive circuit comprises AC/DC rectification circuit 1, DC/DC constant-current circuit 2, feedback circuit 3.
Described AC/DC rectification circuit 1 comprises transformer T1 and rectification module, and described rectification module comprises full-bridge rectifier D1 and filter capacitor C1.
Described DC/DC constant-current circuit comprises switch power module, inverting model 21 and filtration module.
The switch power module of present embodiment adopts the switching power circuit IC (MC34063) of integrated chip U1, it is supplied with the 6. pin of integrated chip U1 by the direct current positive electricity of AC/DC rectification circuit 1, negative electricity supplies 4. pin, integrated chip U1 work back is from 2. pin output, export the ripple ratio height of direct current this moment, so add inverting model 21 and filtration module, described inverting model 21 comprises coil L1, rectifier diode D2, described rectifier diode D2 is anodal in parallel with coil L1 input, and be connected with the 2. pin of the output of integrated chip U1, described rectifier diode D2 negative pole links to each other with the switch power module negative pole.Described filtration module is filter capacitor C3, and the heat energy the when ripple of coil L1, rectifier diode D2 mitigation direct current output changes into the work of magnetic energy minimizing LED lamp to additional electric energy improves lamp efficient.
Described feedback circuit, comprise sampling resistor, present embodiment, comprise resistance R 3 and R4, resistance R 3 and R4 are serially connected with DC/DC constant-current circuit output, the output that promptly is serially connected with integrated chip U1 is pin 5., is used for the led light source circuit and constitutes the loop, by sampling resistor the 5. pin that current signal feeds back to integrated chip U1 is made integrated chip U1 automatic constant current.
Owing to adopt the current constant mode driving LED, thus electric current by filter capacitor C3 anode through the LED positive pole, flow to negative pole, through sampling resistor R3, R4 LED is lighted and gets back to filter capacitor C3 negative pole and finish the loop.If integrated chip U1 entered protection system automatically when no signal was to the 5. pin of integrated chip U1 when LED damaged open circuit.Wait for that the LED renewal can recover to open and need start shooting again among the operate as normal after normally errorless automatically.
Described led light source circuit 4 mainly is to be one group by 2 LED series connection, and it is anodal and anodal in parallel to be designed to 12 groups of each groups in the present embodiment circuit, and negative pole is in parallel with negative pole, the composition series-parallel circuit.This circuit can design forms led module on pcb board.
Foregoing circuit can design on pcb board, and in external shell, supporting mechanism and electrical connector constitute the LED lighting together.
In a word, the above only is preferred embodiment of the present utility model, and all equalizations of being done according to the utility model claim change and modify, and all should belong to the covering scope of the utility model patent.
Claims (6)
1. a led drive circuit is characterized in that, comprises AC/DC rectification circuit (1), DC/DC constant-current circuit (2), feedback circuit (3); Described AC/DC rectification circuit (1) input is connected with the 220V alternating current, and its output is connected with described DC/DC constant-current circuit (2) voltage input end; Described DC/DC constant-current circuit (2) output driving LED circuit of light sources (4); Described feedback circuit (3) input is connected with described DC/DC constant-current circuit (2) output, and its output is connected with the feedback signal input of described DC/DC constant-current circuit (2).
2. a kind of led drive circuit according to claim 1 is characterized in that, described AC/DC rectification circuit (1) comprises transformer (T1) and rectification module: described transformer (T1) input is connected 220 alternating currents; Described rectification module comprises full-bridge rectifier (D1) and filter capacitor (C1), the output of described filter capacitor (C1) cross-over connection full-bridge rectifier (D1).
3. a kind of led drive circuit according to claim 1 and 2, it is characterized in that, described DC/DC constant-current circuit (2) comprises switch power module, inverting model (21) and filtration module: described switch power module is connected with AC/DC rectification circuit (1) output respectively; Described inverting model comprises coil (L1) and rectifier diode (D2), described rectifier diode (D2) is anodal to be connected with coil (L1) input, and be connected with a wherein output of switch power module, described rectifier diode (D2) negative pole links to each other with the switch power module negative pole.
4. a kind of led drive circuit according to claim 3 is characterized in that, described switch power module mainly is made of integrated chip (U1).
5. a kind of led drive circuit according to claim 4, it is characterized in that, described feedback circuit (3) comprises sampling resistor, and the output of the integrated chip (U1) in described sampling resistor and the DC/DC constant-current circuit (2) 5. pin is connected, and uses and led light source circuit (4) constitutes the loop.
6. a kind of led drive circuit according to claim 5 is characterized in that, described filtration module is filter capacitor (C3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201105557U CN201114894Y (en) | 2007-06-13 | 2007-06-13 | A LED driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201105557U CN201114894Y (en) | 2007-06-13 | 2007-06-13 | A LED driving circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201114894Y true CN201114894Y (en) | 2008-09-10 |
Family
ID=39966645
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201105557U Expired - Fee Related CN201114894Y (en) | 2007-06-13 | 2007-06-13 | A LED driving circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201114894Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101965078A (en) * | 2009-07-22 | 2011-02-02 | 深圳市桑达实业股份有限公司 | Light emitting diode drive circuit, light emitting diode luminaire and light emitting diode lighting system |
| CN102006704A (en) * | 2010-12-24 | 2011-04-06 | 上海电机学院 | Light-emitting diode (LED) drive control circuit and lighting device |
| CN102685966A (en) * | 2011-03-10 | 2012-09-19 | 海洋王照明科技股份有限公司 | Constant current circuit and lamp |
-
2007
- 2007-06-13 CN CNU2007201105557U patent/CN201114894Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101965078A (en) * | 2009-07-22 | 2011-02-02 | 深圳市桑达实业股份有限公司 | Light emitting diode drive circuit, light emitting diode luminaire and light emitting diode lighting system |
| CN101965078B (en) * | 2009-07-22 | 2013-09-04 | 深圳市桑达实业股份有限公司 | Light emitting diode drive circuit, light emitting diode luminaire and light emitting diode lighting system |
| CN102006704A (en) * | 2010-12-24 | 2011-04-06 | 上海电机学院 | Light-emitting diode (LED) drive control circuit and lighting device |
| CN102685966A (en) * | 2011-03-10 | 2012-09-19 | 海洋王照明科技股份有限公司 | Constant current circuit and lamp |
| CN102685966B (en) * | 2011-03-10 | 2015-10-28 | 海洋王照明科技股份有限公司 | A kind of constant-current circuit and light fixture |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101541116B (en) | Electronic ballast of alternate current high-power LED illumination energy-saving lamp | |
| CN201204722Y (en) | An automatic dimming LED lighting driver | |
| CN101636021A (en) | LED constant current driving circuit | |
| CN101626652A (en) | Dimmable LED constant current source driver with wide voltage range | |
| CN104703358A (en) | Wide-voltage-range LED (light emitting diode) lamp switching and dimming driving circuit and LED lamp dimming control system | |
| CN201174799Y (en) | Electronic ballast for AC large power LED illuminating energy saving lamp | |
| CN201114894Y (en) | A LED driving circuit | |
| CN102510605B (en) | Novel LED (light emitting diode) driving circuit and drive method | |
| CN201651870U (en) | Alternating current energy-saving LED illuminating lamp | |
| CN201479432U (en) | A Wide Voltage Range Dimmable LED Constant Current Source Driver | |
| CN201904959U (en) | LED drive circuit with long service life | |
| CN201378883Y (en) | Constant-voltage LED lighting circuit | |
| CN201116683Y (en) | an emergency light | |
| CN201238410Y (en) | LED solar street lamp controller | |
| CN201731335U (en) | Alternating current direct-drive LED lamp tube | |
| CN201134955Y (en) | A high stability LED lighting drive controller | |
| CN201196345Y (en) | LED spot light suitable for AC commercial power | |
| CN101008480A (en) | Module combined low-voltage LED fluorescent lamp | |
| CN204482110U (en) | There is the high-power LED lamp of automatic temperature-adjusting controlling functions | |
| CN101616519A (en) | Constant-voltage LED illumination circuit | |
| CN2829278Y (en) | LED lighting drive circuit | |
| CN2829281Y (en) | LED lighting drive circuit | |
| CN202931607U (en) | Pulse width modulation type LED (Light-Emitting Diode) lamp driving circuit with current protection capability | |
| CN2684516Y (en) | AC power supply LED light fixture | |
| CN202915227U (en) | Mining low-power-consumption emergency LED (Light-Emitting Diode) lighting device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: ZHEJIANG SINGBEE LIGHTING TECHNOLOGY CO., LTD. Free format text: FORMER OWNER: WANG YUANCHENG Effective date: 20110727 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20110727 Address after: 322200, Pujiang County Economic Development Zone, star Bi Avenue, No. 88 Patentee after: ZHEJIANG SINGBEE LIGHTING TECHNOLOGY CO., LTD. Address before: 322200 No. 88, Bi Bi Avenue, Pujiang Economic Development Zone, Zhejiang Province Patentee before: Wang Yuancheng |
|
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080910 Termination date: 20130613 |