CN102083249A - LED (light-emitting diode) lighting circuit - Google Patents
LED (light-emitting diode) lighting circuit Download PDFInfo
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- CN102083249A CN102083249A CN2009101885162A CN200910188516A CN102083249A CN 102083249 A CN102083249 A CN 102083249A CN 2009101885162 A CN2009101885162 A CN 2009101885162A CN 200910188516 A CN200910188516 A CN 200910188516A CN 102083249 A CN102083249 A CN 102083249A
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- 239000003990 capacitor Substances 0.000 description 8
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- 238000005070 sampling Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
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Abstract
The invention is suitable for the technical field of an LED (light-emitting diode), and provides an LED lighting circuit. The LED lighting circuit is composed of a PWM (pulse-width modulation) transformer, a rectifier filter circuit, an LED load and a feedback circuit. In the invention, by adopting the feedback circuit in the LED lighting circuit, the current change of the LED load is effectively controlled, the current of the LED load is kept constant, and the damage to an LED due to abrupt current change is avoided.
Description
Technical field
The invention belongs to the technical field of LED, relate in particular to a kind of LED lighting circuit.
Background technology
The LED illumination has been widely used in the middle of the daily life, adopts the LED illumination to have advantages such as low energy consumption, long service life and environmental protection.
Existing LED lighting circuit adopts constant voltage circuit, this lighting circuit can cause the damage of LED load in the process of using, because LED is the negative temperature coefficient device, when temperature raises, its impedance meeting reduces, and can cause the electric current that flows through LED to increase like this, thereby cause the temperature of LED to raise rapidly, as electric current not being controlled, LED will damage.
Summary of the invention
The object of the present invention is to provide a kind of LED lighting circuit, be intended to solve the problem that existing LED lighting circuit can cause LED to damage.
The present invention is achieved in that a kind of LED lighting circuit, and described LED lighting circuit comprises:
The PWM transformer that is connected with power input;
The current rectifying and wave filtering circuit that is connected with the output of described PWM transformer;
The LED load that is connected with the output of described current rectifying and wave filtering circuit; And
Input is connected with described LED load, the feedback circuit that output is connected with the PWM transformer, and described feedback circuit feeds back to the PWM transformer with the electric current variation of LED load, and the electric current that described PWM transformer control flows is crossed the LED load keeps constant current.
In the said structure, described feedback circuit comprises sample circuit, comparator, photoelectrical coupler, PWM controller and switching tube, the input termination LED load of described sample circuit, the first input end of the output termination comparator of described sample circuit, the second input termination reference voltage of described comparator, the input of the output termination photoelectrical coupler of described comparator, the input of the output termination PWM controller of described photoelectrical coupler, the output termination control end of switching tube of described PWM controller, described output end of switching tube connects the PWM transformer.
In the said structure, described comparator adopts operational amplifier, the inverting input of described operational amplifier accesses the output of sample circuit, and the in-phase input end of described operational amplifier connects reference voltage, the input of the output termination photoelectrical coupler of described operational amplifier.
In the said structure, described switching tube adopts field effect transistor, and the grid of described field effect transistor connects the output of PWM controller, and the drain electrode of described field effect transistor connects the PWM transformer, the source ground of described field effect transistor.
In the present invention, the LED lighting circuit adopts feedback circuit, and the electric current of having controlled the LED load effectively changes, and makes the electric current of LED load keep constant, has avoided LED to be damaged because of current break.
Description of drawings
Fig. 1 is the structure chart of the LED lighting circuit that provides of the embodiment of the invention;
Fig. 2 is the exemplary circuit figure of the LED lighting circuit that provides of the embodiment of the invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
Fig. 1 shows the structure of the LED lighting circuit that the embodiment of the invention provides.
The LED lighting circuit comprises PWM transformer 100, current rectifying and wave filtering circuit 200, LED load 300 and feedback circuit 400.
Wherein, feedback circuit 400 comprises sample circuit 401, comparator 402, photoelectrical coupler 403, PWM controller 404 and switching tube 405, the input termination LED load 300 of sample circuit 401, the first input end of the output termination comparator 402 of sample circuit 401, the second input termination reference voltage of comparator 402, the input of the output termination photoelectrical coupler 403 of comparator 402, the input of the output termination PWM controller 404 of photoelectrical coupler 403, the control end of the output termination switching tube 405 of PWM controller 404, the output termination PWM transformer 100 of switching tube 405.
As one embodiment of the invention, comparator 402 adopts operational amplifier U1, the inverting input of operational amplifier U1 accesses the output of sample circuit 401, and the in-phase input end of operational amplifier U1 connects reference voltage, the input of the output termination photoelectrical coupler 403 of operational amplifier U1.
As one embodiment of the invention, switching tube 405 adopts field effect transistor Q1, and the grid of field effect transistor Q1 connects the output of PWM controller 404, and the drain electrode of field effect transistor Q1 connects PWM transformer 100, the source ground of field effect transistor Q1.
Fig. 2 shows the exemplary circuit structure of the LED lighting circuit that the embodiment of the invention provides.
The LED lighting circuit comprises PWM transformer 100, the first diode D1, the second diode D2, first capacitor C 1, second capacitor C 2, resistance R 1, a LED lamp L1, the 2nd LED lamp L2, the 3rd LED lamp L3, sample circuit 401, operational amplifier U1, photoelectrical coupler 403, PWM controller 404 and field effect transistor Q1.
Wherein, the first diode D1, the second diode D2, first capacitor C 1, second capacitor C 2 and resistance R 1 formation current rectifying and wave filtering circuit 200, the one LED lamp L1, the 2nd LED lamp L2 and the 3rd LED lamp L3 are serially connected successively and constitute LED load 300.
The first termination power input of the elementary winding of PWM transformer 100, first end of the secondary winding of PWM transformer 100 connects the anode of the first diode D1 and the second diode D2 simultaneously, the second termination equipotential of the secondary winding of PWM transformer 100, the negative electrode of the first diode D1 and the second diode D2 connects first end of first capacitor C 1 simultaneously, the anode of first end of second capacitor C 2 and a LED lamp L1, second end of second end of first capacitor C 1 and second capacitor C 2 connects equipotential simultaneously, the one LED lamp L1, the 2nd LED lamp L2 and the 3rd LED lamp L3 are connected in series successively, the negative electrode of the 3rd LED lamp L3 is leaded up to resistance R 1 and is connect equipotential, another road of negative electrode of the 3rd LED lamp L3 accesses the input of sample circuit 401, the inverting input of the output termination operational amplifier U1 of sample circuit 401, the in-phase input end of operational amplifier U1 connects reference voltage, first end of the output termination photoelectrical coupler 403 of operational amplifier U1, the second termination equipotential of photoelectrical coupler 403, the 3rd end ground connection of photoelectrical coupler 403, the input of the 4th termination PWM controller 404 of photoelectrical coupler 403, the grid of the output termination field effect transistor Q1 of PWM controller 404, the source ground of field effect transistor Q1, the drain electrode of field effect transistor Q1 connect second end of the elementary winding of PWM transformer 100.
The course of work of the LED lighting circuit that the embodiment of the invention provides is:
In embodiments of the present invention, the LED lighting circuit adopts feedback circuit, and the electric current of having controlled the LED load effectively changes, and makes the electric current of LED load keep constant, has avoided LED to be damaged because of current break.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1. a LED lighting circuit is characterized in that, described LED lighting circuit comprises:
The PWM transformer that is connected with power input;
The current rectifying and wave filtering circuit that is connected with the output of described PWM transformer;
The LED load that is connected with the output of described current rectifying and wave filtering circuit; And
Input is connected with described LED load, the feedback circuit that output is connected with the PWM transformer, and described feedback circuit feeds back to the PWM transformer with the electric current variation of LED load, and the electric current that described PWM transformer control flows is crossed the LED load keeps constant current.
2. LED lighting circuit as claimed in claim 1, it is characterized in that, described feedback circuit comprises sample circuit, comparator, photoelectrical coupler, PWM controller and switching tube, the input termination LED load of described sample circuit, the first input end of the output termination comparator of described sample circuit, the second input termination reference voltage of described comparator, the input of the output termination photoelectrical coupler of described comparator, the input of the output termination PWM controller of described photoelectrical coupler, the output termination control end of switching tube of described PWM controller, described output end of switching tube connects the PWM transformer.
3. LED lighting circuit as claimed in claim 2, it is characterized in that, described comparator adopts operational amplifier, the inverting input of described operational amplifier accesses the output of sample circuit, the in-phase input end of described operational amplifier connects reference voltage, the input of the output termination photoelectrical coupler of described operational amplifier.
4. LED lighting circuit as claimed in claim 2 is characterized in that, described switching tube adopts field effect transistor, and the grid of described field effect transistor connects the output of PWM controller, and the drain electrode of described field effect transistor connects the PWM transformer, the source ground of described field effect transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101885162A CN102083249A (en) | 2009-11-30 | 2009-11-30 | LED (light-emitting diode) lighting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101885162A CN102083249A (en) | 2009-11-30 | 2009-11-30 | LED (light-emitting diode) lighting circuit |
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| Publication Number | Publication Date |
|---|---|
| CN102083249A true CN102083249A (en) | 2011-06-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009101885162A Pending CN102083249A (en) | 2009-11-30 | 2009-11-30 | LED (light-emitting diode) lighting circuit |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102264181A (en) * | 2011-07-11 | 2011-11-30 | 苏州辰戈电子有限公司 | Multi-path LED (Light Emitting Diode) controlling and driving system |
| CN103249220A (en) * | 2012-02-13 | 2013-08-14 | 松下电器产业株式会社 | Semiconductor light emitting element drive device and lighting fixture with the same |
| CN103647439A (en) * | 2013-11-22 | 2014-03-19 | 华南理工大学 | An output filter circuit of an LED driving power supply and an LED driving power supply circuit |
| CN103680418A (en) * | 2012-09-24 | 2014-03-26 | 精工爱普生株式会社 | Display apparatus and method for controlling display apparatus |
| CN108966416A (en) * | 2018-07-11 | 2018-12-07 | 昆山仕优威电子科技有限公司 | A kind of control system of UV LED light source |
| CN109275231A (en) * | 2018-10-26 | 2019-01-25 | 佛山市华全电气照明有限公司 | A kind of protection control circuit of Anti-surging impact or current break |
-
2009
- 2009-11-30 CN CN2009101885162A patent/CN102083249A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102264181A (en) * | 2011-07-11 | 2011-11-30 | 苏州辰戈电子有限公司 | Multi-path LED (Light Emitting Diode) controlling and driving system |
| CN103249220A (en) * | 2012-02-13 | 2013-08-14 | 松下电器产业株式会社 | Semiconductor light emitting element drive device and lighting fixture with the same |
| CN103249220B (en) * | 2012-02-13 | 2014-12-31 | 松下电器产业株式会社 | Semiconductor light emitting element drive device and lighting fixture with the same |
| CN103680418A (en) * | 2012-09-24 | 2014-03-26 | 精工爱普生株式会社 | Display apparatus and method for controlling display apparatus |
| CN103647439A (en) * | 2013-11-22 | 2014-03-19 | 华南理工大学 | An output filter circuit of an LED driving power supply and an LED driving power supply circuit |
| CN103647439B (en) * | 2013-11-22 | 2015-12-02 | 华南理工大学 | The output filter circuit of LED drive power and LED drive power circuit |
| CN108966416A (en) * | 2018-07-11 | 2018-12-07 | 昆山仕优威电子科技有限公司 | A kind of control system of UV LED light source |
| CN109275231A (en) * | 2018-10-26 | 2019-01-25 | 佛山市华全电气照明有限公司 | A kind of protection control circuit of Anti-surging impact or current break |
| CN109275231B (en) * | 2018-10-26 | 2024-03-19 | 佛山市华全电气照明有限公司 | Protection control circuit for preventing surge impact or current abrupt change |
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Application publication date: 20110601 |