CN101801129A - LED low-power drive circuit and LED lamp - Google Patents
LED low-power drive circuit and LED lamp Download PDFInfo
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- CN101801129A CN101801129A CN201010104473A CN201010104473A CN101801129A CN 101801129 A CN101801129 A CN 101801129A CN 201010104473 A CN201010104473 A CN 201010104473A CN 201010104473 A CN201010104473 A CN 201010104473A CN 101801129 A CN101801129 A CN 101801129A
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Abstract
The invention is applied in the field of LED circuits, and provides an LED low-power drive circuit and an LED lamp. The LED low-power drive circuit comprises a rectifying unit, a current harmonic processing unit, a voltage transformation unit, a rectifying and filtering unit, an output drive unit, a feedback unit and a dimming unit. In the invention, the LED low-power drive circuit provided by the embodiment of the invention can be matched with the low-power LED lamp for use to make the low power LED lamp widely applied to households, business or entertainment places, prolong the service life of the lamp and greatly save electric energy.
Description
Technical field
The invention belongs to the led circuit field, relate in particular to a kind of LED low-power drive circuit and LED light fixture.
Background technology
At present aspect family expenses, commercial affairs or public place of entertainment usefulness lamp, generally all also be to use incandescent lamp or fluorescent lamp, the words of considering from the angle in energy-conserving and environment-protective, useful life, use incandescent lamp or fluorescent lamp all to have not energy-conserving and environment-protective, and useful life short problem, yet use low-power LED lamp just can improve these problems greatly, but also do not develop at present and the matching used drive circuit of low-power LED lamp, so low-power LED lamp also is not used in family expenses, commercial affairs or public place of entertainment at present.
Summary of the invention
The purpose of the embodiment of the invention is to provide a kind of LED low-power drive circuit, is intended to solve the problem of now also not developing with the matching used drive circuit of low-power LED lamp.
The embodiment of the invention is achieved in that a kind of LED low-power drive circuit, and described LED low-power drive circuit comprises:
The rectification unit of input termination AC power;
The current harmonics processing unit of the output of the described rectification unit of input termination is used for the voltage of described rectification unit output is carried out the current harmonics processing;
The voltage transformation unit of the output of the described current harmonics processing unit of input termination is used for the voltage of described current harmonics processing unit output is carried out the transformation processing;
The rectification filtering unit of the output of the described voltage transformation unit of input termination is used for the voltage of described voltage transformation unit output is carried out the rectifying and wave-filtering processing;
The output driver element of the output of the described rectification filtering unit of input termination, output termination LED, the voltage transitions that is used for described rectification filtering unit output is the driving voltage of driving LED work; And the output of the described rectification filtering unit of input termination, the feedback unit of the control end of the described voltage transformation unit of output termination is used for giving described voltage transformation unit with the Voltage Feedback of described rectification filtering unit output, and described voltage transformation unit is adjusted its output voltage;
Described LED low-power drive circuit also comprises the light modulation unit, the output of the input termination rectification filtering unit of described light modulation unit, the input of the output termination output driver element of described light modulation unit, described light modulation unit comprises light modulation chip and adjustable resistance, the output of the input termination rectification filtering unit of described light modulation chip, the input of the output termination output driver element of described light modulation chip, the control termination adjustable resistance of described light modulation chip.
Another purpose of the embodiment of the invention is to provide a kind of LED light fixture that comprises above-mentioned LED low-power drive circuit.
In embodiments of the present invention, the LED low-power drive circuit that the embodiment of the invention provides can with the supporting use of low-power LED lamp, make low-power LED lamp can be widely used in family expenses, commercial affairs or public place of entertainment, so not only improve the useful life of light fixture, also saved electric energy greatly.
Description of drawings
Fig. 1 is the structure chart of the LED low-power drive circuit that provides of the embodiment of the invention;
Fig. 2 is the exemplary circuit structure chart of the LED low-power drive circuit that provides of the embodiment of the invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with accompanying drawing and reality
Execute example, the present invention is further elaborated.Only should be appreciated that specific embodiment described herein
Only in order to explaining the present invention, and be not used in qualification the present invention.
Fig. 1 shows the structure of the LED low-power drive circuit that the embodiment of the invention provides, and for convenience of explanation, only shows the part relevant with the embodiment of the invention.
The LED low-power drive circuit comprises rectification unit 100, current harmonics processing unit 200, voltage transformation unit 300, rectification filtering unit 400, output driver element 500 and feedback unit 600.
The input termination AC power of rectification unit 100;
The output of the input termination rectification unit 100 of current harmonics processing unit 200 is used for voltage to the output of rectification unit 100 and carries out current harmonics and handle;
The output of the input termination current harmonics processing unit 200 of voltage transformation unit 300 is used for the voltage of current harmonics processing unit 200 outputs is carried out the transformation processing;
The output of the input termination voltage transformation unit 300 of rectification filtering unit 400 is used for the voltage of voltage transformation unit 300 outputs is carried out the rectifying and wave-filtering processing;
The output termination LED of the output of the input termination rectification filtering unit 400 of output driver element 500, output driver element 500, the voltage transitions that is used for rectification filtering unit 400 outputs is the driving voltage of driving LED work;
The output of the input termination rectification filtering unit 400 of feedback unit 600, the control end of the output termination voltage transformation unit 300 of feedback unit 600, be used for giving voltage transformation unit 300 with the Voltage Feedback of rectification filtering unit 400 outputs, voltage transformation unit 300 is adjusted its output voltage.
The LED low-power drive circuit also comprises light modulation unit 700, the output of the input termination rectification filtering unit 400 of light modulation unit 700, the input of the output termination output driver element 500 of light modulation unit 700.
Fig. 2 shows the exemplary circuit structure of the LED low-power drive circuit that the embodiment of the invention provides, and for convenience of explanation, only shows the part relevant with the embodiment of the invention.
As one embodiment of the invention, rectification unit 100 comprises rectifier bridge D1, the input termination AC power of rectifier bridge D1, the input of the output termination current harmonics processing unit 200 of rectifier bridge D1.
As one embodiment of the invention, current harmonics processing unit 200 comprises inductance L 1, resistance R 4, capacitor C 1 and capacitor C 2, wherein, inductance L 1 and resistance R 4 parallel connections, first public connecting end of inductance L 1 and resistance R 4 is as the input of current harmonics processing unit 200, one the tunnel connects the output of rectifier bridge D1, another road of first public connecting end of inductance L 1 and resistance R 4 is by capacitor C 1 ground connection, second public connecting end of inductance L 1 and resistance R 4 is as the output of current harmonics processing unit 200, one the tunnel connects the input of voltage transformation unit 300, and another road of second public connecting end of inductance L 1 and resistance R 4 is by capacitor C 2 ground connection.
As one embodiment of the invention, voltage transformation unit 300 comprises transformer T1 and transformation control module U1;
Transformer T1 comprises elementary winding, auxiliary winding and secondary winding, and transformation control module U1 comprises that input FB end and vdd terminal, earth terminal S end, output D hold.
1 end of the elementary winding of transformer T1 and 2 ends are as the input of transformer T1, the output of 1 termination current harmonics processing unit 200 of the elementary winding of transformer T1, the output D end of 2 termination transformation control module U1 of the elementary winding of transformer T1, be connected with capacitor C 3 and resistance R 5 in parallel between 1 end of elementary winding and 2 ends, also be connected with between 1 end of elementary winding and 2 ends and capacitor C in parallel 3 and resistance R 5 diode in series D5,5 ends of the secondary winding of transformer T1 and 6 ends are as the output of transformer T1, the input of 6 termination rectification filtering units 400 of the secondary winding of transformer T1,5 ends of the secondary winding of transformer T1 are by capacitor C 6 ground connection, the output that the input FB end of transformation control module U1 and vdd terminal connect feedback unit 600 respectively, input FB end is also by capacitor C 11 ground connection, and the input vdd terminal is also by capacitor C 5 ground connection.3 end ground connection of the auxiliary winding of transformer T1,4 ends of the auxiliary winding of transformer T1 are by the resistance R 6 and the diode D6 input vdd terminal that meets transformation control module U1 of serial connection.
As one embodiment of the invention, light modulation unit 700 comprises light modulation chip U2 and adjustable resistance Rw, the input IN of light modulation chip U2 connects the output of rectification filtering unit 400, the output OUT of light modulation chip U2 connects the input of output driver element 500, and the control end AD of light modulation chip U2 meets adjustable resistance Rw.
As one embodiment of the invention, output driver element 500 comprises output chip for driving U3, output chip for driving U3 comprises input VCC and output OUT, and the input VCC of output chip for driving U3 connects the output of light modulation unit 700, and the output OUT of output chip for driving U3 meets LED.
Output chip for driving U3 also comprises CS end, GND end and OSC end, output driver element 500 also comprises inductance L 3, capacitor C 10 and diode D9, the input VCC of the CS termination output chip for driving U3 of output chip for driving U3, the GND end ground connection of output chip for driving U3, the OSC end of output chip for driving U3 is by capacitor C 10 ground connection, inductance L 3 is connected between the output and LED of output chip for driving U3, and diode D9 is connected between the output and ground of output chip for driving U3.
As one embodiment of the invention, feedback unit 600 comprises photoelectrical coupler U4, the output of the first input end of photoelectrical coupler U4 and the second input termination rectification filtering unit 400, input FB end and the vdd terminal of first output of photoelectrical coupler U4 and the second output termination transformation control module U1, feedback unit 600 also comprises voltage-stabiliser tube ZD1, resistance R 9 and resistance R 10, resistance R 9 is connected between the first input end of second end of inductance L 2 and photoelectrical coupler U4, and voltage-stabiliser tube ZD1 and resistance R 10 are serially connected between second input of capacitor C 7 and photoelectrical coupler U4.
Its operation principle is:
Alternating voltage is through the processing of rectification unit 100, current harmonics processing unit 200, voltage transformation unit 300, rectification filtering unit 400, output driver element 500, the constant voltage of LED work is satisfied in output, and feedback unit 600 is given voltage transformation unit 300 with the Voltage Feedback of rectification filtering unit 400 outputs, voltage transformation unit 300 is adjusted its output voltage, to satisfy the LED requirements of one's work.
And by regulating the resistance of adjustable resistance Rw, just can change the output current of LED low-power drive circuit, thereby can change the brightness of LED.
The embodiment of the invention also provides a kind of LED light fixture that comprises above-mentioned LED low-power drive circuit.
In embodiments of the present invention, the LED low-power drive circuit that the embodiment of the invention provides can with the supporting use of low-power LED lamp, make low-power LED lamp can be widely used in family expenses, commercial affairs or public place of entertainment, so not only improve the useful life of light fixture, also saved electric energy greatly.
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 (6)
1. a LED low-power drive circuit is characterized in that, described LED low-power drive circuit comprises:
The rectification unit of input termination AC power;
The current harmonics processing unit of the output of the described rectification unit of input termination is used for the voltage of described rectification unit output is carried out the current harmonics processing;
The voltage transformation unit of the output of the described current harmonics processing unit of input termination is used for the voltage of described current harmonics processing unit output is carried out the transformation processing;
The rectification filtering unit of the output of the described voltage transformation unit of input termination is used for the voltage of described voltage transformation unit output is carried out the rectifying and wave-filtering processing;
The output driver element of the output of the described rectification filtering unit of input termination, output termination LED, the voltage transitions that is used for described rectification filtering unit output is the driving voltage of driving LED work; And
The output of the described rectification filtering unit of input termination, the feedback unit of the control end of the described voltage transformation unit of output termination is used for giving described voltage transformation unit with the Voltage Feedback of described rectification filtering unit output, and described voltage transformation unit is adjusted its output voltage;
Described LED low-power drive circuit also comprises the light modulation unit, the output of the input termination rectification filtering unit of described light modulation unit, the input of the output termination output driver element of described light modulation unit, described light modulation unit comprises light modulation chip and adjustable resistance, the output of the input termination rectification filtering unit of described light modulation chip, the input of the output termination output driver element of described light modulation chip, the control termination adjustable resistance of described light modulation chip.
2. LED low-power drive circuit as claimed in claim 1 is characterized in that described rectification unit comprises rectifier bridge, the input termination AC power of described rectifier bridge, the input of the output termination current harmonics processing unit of described rectifier bridge.
3. LED low-power drive circuit as claimed in claim 1 is characterized in that, described voltage transformation unit comprises transformer and transformation control module;
The output of the input termination current harmonics processing unit of described transformer and the output of transformation control module, the input of the output termination rectification filtering unit of described transformer, the output of the input termination feedback unit of described transformation control module.
4. LED low-power drive circuit as claimed in claim 1 is characterized in that, described output driver element comprises the output chip for driving, the output of the input termination light modulation unit of described output chip for driving, the output termination LED of described output chip for driving.
5. LED low-power drive circuit as claimed in claim 3, it is characterized in that, described feedback unit comprises photoelectrical coupler, the output of the first input end of described photoelectrical coupler and the second input termination rectification filtering unit, the input of first output of described photoelectrical coupler and the described transformation control module of the second output termination.
6. a LED light fixture is characterized in that, described LED light fixture comprises each described LED low-power drive circuit as claim 1-5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010104473A CN101801129A (en) | 2010-01-28 | 2010-01-28 | LED low-power drive circuit and LED lamp |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010104473A CN101801129A (en) | 2010-01-28 | 2010-01-28 | LED low-power drive circuit and LED lamp |
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| CN101801129A true CN101801129A (en) | 2010-08-11 |
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| CN201010104473A Pending CN101801129A (en) | 2010-01-28 | 2010-01-28 | LED low-power drive circuit and LED lamp |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8378588B2 (en) | 2008-12-12 | 2013-02-19 | O2Micro Inc | Circuits and methods for driving light sources |
| US8508150B2 (en) | 2008-12-12 | 2013-08-13 | O2Micro, Inc. | Controllers, systems and methods for controlling dimming of light sources |
| CN103415116A (en) * | 2013-08-15 | 2013-11-27 | 京东方科技集团股份有限公司 | Dimming circuit and dimmable lighting device |
| GB2503316A (en) * | 2012-06-22 | 2013-12-25 | O2Micro Inc | Circuits and methods for driving light sources |
| US8698419B2 (en) | 2010-03-04 | 2014-04-15 | O2Micro, Inc. | Circuits and methods for driving light sources |
| US8866398B2 (en) | 2012-05-11 | 2014-10-21 | O2Micro, Inc. | Circuits and methods for driving light sources |
| US9030122B2 (en) | 2008-12-12 | 2015-05-12 | O2Micro, Inc. | Circuits and methods for driving LED light sources |
| WO2015196609A1 (en) * | 2014-06-26 | 2015-12-30 | 京东方科技集团股份有限公司 | Sectional-type dimming circuit and dimmable lighting device |
| US9232591B2 (en) | 2008-12-12 | 2016-01-05 | O2Micro Inc. | Circuits and methods for driving light sources |
| US9253843B2 (en) | 2008-12-12 | 2016-02-02 | 02Micro Inc | Driving circuit with dimming controller for driving light sources |
| US9386653B2 (en) | 2008-12-12 | 2016-07-05 | O2Micro Inc | Circuits and methods for driving light sources |
| WO2018112905A1 (en) * | 2016-12-23 | 2018-06-28 | 惠州市优科光电科技有限公司 | Led power supply circuit with dimming function |
| CN111489706A (en) * | 2020-04-29 | 2020-08-04 | 深圳市江元科技(集团)有限公司 | L ED backlight driving device and television |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9232591B2 (en) | 2008-12-12 | 2016-01-05 | O2Micro Inc. | Circuits and methods for driving light sources |
| US8508150B2 (en) | 2008-12-12 | 2013-08-13 | O2Micro, Inc. | Controllers, systems and methods for controlling dimming of light sources |
| US9386653B2 (en) | 2008-12-12 | 2016-07-05 | O2Micro Inc | Circuits and methods for driving light sources |
| US8378588B2 (en) | 2008-12-12 | 2013-02-19 | O2Micro Inc | Circuits and methods for driving light sources |
| US9253843B2 (en) | 2008-12-12 | 2016-02-02 | 02Micro Inc | Driving circuit with dimming controller for driving light sources |
| US9030122B2 (en) | 2008-12-12 | 2015-05-12 | O2Micro, Inc. | Circuits and methods for driving LED light sources |
| US8698419B2 (en) | 2010-03-04 | 2014-04-15 | O2Micro, Inc. | Circuits and methods for driving light sources |
| US8866398B2 (en) | 2012-05-11 | 2014-10-21 | O2Micro, Inc. | Circuits and methods for driving light sources |
| GB2503316B (en) * | 2012-06-22 | 2015-10-14 | O2Micro Inc | Circuits and methods for driving light sources |
| GB2503316A (en) * | 2012-06-22 | 2013-12-25 | O2Micro Inc | Circuits and methods for driving light sources |
| CN103415116A (en) * | 2013-08-15 | 2013-11-27 | 京东方科技集团股份有限公司 | Dimming circuit and dimmable lighting device |
| WO2015196609A1 (en) * | 2014-06-26 | 2015-12-30 | 京东方科技集团股份有限公司 | Sectional-type dimming circuit and dimmable lighting device |
| WO2018112905A1 (en) * | 2016-12-23 | 2018-06-28 | 惠州市优科光电科技有限公司 | Led power supply circuit with dimming function |
| CN111489706A (en) * | 2020-04-29 | 2020-08-04 | 深圳市江元科技(集团)有限公司 | L ED backlight driving device and television |
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Application publication date: 20100811 |