CN102469651B - LED drive circuit and light fixture - Google Patents
LED drive circuit and light fixture Download PDFInfo
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- CN102469651B CN102469651B CN201010539827.1A CN201010539827A CN102469651B CN 102469651 B CN102469651 B CN 102469651B CN 201010539827 A CN201010539827 A CN 201010539827A CN 102469651 B CN102469651 B CN 102469651B
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Abstract
The invention is applied to the illumination technology field, and provides an LED drive circuit and a light fixture. In the invention, the LED drive circuit comprises a constant voltage unit and a constant current unit, thus output voltage of the LED drive circuit is constant at rated voltage of an LED load, an LED works with constant voltage and constant current, and stable and reliable work of the LED is ensured.
Description
Technical field
The invention belongs to lighting technical field, relate in particular to a kind of LED drive circuit and light fixture.
Background technology
LED is as new type light source, and it has energy-saving and environmental protection, feature efficiently, and technology is ripe and be applied to every field, and LED is widely used as lighting source, has also occurred various LED drive circuits thereupon.LED is as constant current operating load, and because LED self is harsher to operating voltage requirement, overtension is too low all can cause LED work undesired, so the power supply quality of supply voltage directly affects the reliability of LED.In the place of DC low-voltage power supply, be all to adopt constant current technology to carry out driving LED at present, it has the advantages such as power consumption is little, efficiency is high, unit power volume is little, lightweight, but when its input voltage is too low, can cause LED operating current to reduce, output light flux reduces, LED can not operate at full capacity, and to user, has brought serious inconvenience.
Summary of the invention
The object of the embodiment of the present invention is to provide a kind of LED drive circuit, is intended to solve existing LED drive circuit and has the problem of LED constant pressure and flow work of cannot allowing.
The embodiment of the present invention is achieved in that a kind of LED drive circuit, and for driving LED load, described LED drive circuit comprises:
For described LED load provides the constant current unit of constant current; And
Input termination power, output connects respectively the constant voltage unit of described constant current unit and LED load, is used to described constant current unit and LED load that constant voltage is provided, and described constant voltage unit comprises:
Step-down integrated chip, division module, sampling feedback module, compensating module, the 3rd divider resistance (R3) and shunt capacitance (C3);
The power supply input pin of described step-down integrated chip connects power supply, the power supply output pin of described step-down integrated chip is that the output of constant voltage unit connects respectively described constant current unit and LED load, the input termination power of described division module, the chip operation of the output termination step-down integrated chip of described division module enables pin, the chip oscillate frequency input pin of described step-down integrated chip is by the 3rd divider resistance (R3) ground connection, the lower margin ground connection of described step-down integrated chip, the compensation pin of described step-down integrated chip is by described compensating module ground connection, the power supply output pin of the input termination step-down integrated chip of described sampling feedback module, the output voltage sampling feedback pin of the output termination step-down integrated chip of described sampling feedback module, the input pin of described step-down integrated chip connects the power supply output pin of step-down integrated chip by shunt capacitance (C3),
Described constant current unit comprises constant current chip, described constant current chip adopts QX7135D chip, the supply pin of described constant current chip connects the output of described constant voltage unit and the positive pole of LED load, and the input pin of described constant current chip connects the negative pole of described LED load, the lower margin ground connection of described constant current chip.
In said structure, described division module comprises the first divider resistance (R1) and the second divider resistance (R2), the first termination power of described the first divider resistance (R1), the chip operation that the second end of described the first divider resistance (R1) connects respectively step-down integrated chip enables the first end of pin and the second divider resistance (R2), the second end ground connection of described the second divider resistance (R2).
In said structure, described sampling feedback module comprises the 5th sampling divider resistance (R5) and sampling the 6th divider resistance (R6), the first end of described the 5th sampling divider resistance (R5) is the power supply output pin of the input termination step-down integrated chip of sampling feedback module, the second end of described the 5th sampling divider resistance (R5) is the output voltage sampling feedback pin of the output termination step-down integrated chip of sampling feedback module, and the second end of described the 5th sampling divider resistance (R5) is also by the 6th divider resistance (R6) ground connection.
In said structure, described compensating module comprises building-out capacitor (C4) and the 4th resistance (R4), the compensation pin of the first termination step-down integrated chip of described building-out capacitor (C4), and the second end of described building-out capacitor (C4) is by the 4th resistance (R4) ground connection.
Another object of the embodiment of the present invention is to provide a kind of light fixture, and described light fixture comprises above-mentioned LED drive circuit.
In embodiments of the present invention, LED drive circuit comprises constant voltage unit and constant current unit, makes the output voltage of LED drive circuit constant on the rated voltage of LED load, allows the work of LED constant pressure and flow, guarantees the reliable and stable work of LED.
Accompanying drawing explanation
Fig. 1 is the structure chart of the LED drive circuit that provides of the embodiment of the present invention;
Fig. 2 is the exemplary circuit figure of the LED drive circuit that provides of the embodiment of the present invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Fig. 1 shows the structure of the LED drive circuit that the embodiment of the present invention provides, and for convenience of explanation, only shows part related to the present invention.
LED drive circuit, for driving LED load 300, LED drive circuit comprises constant voltage unit 100 and constant current unit 200.
Constant current unit 200 provides constant current for LED load 300;
The input termination power of constant voltage unit 100, output connects respectively constant current unit 200 and LED load 300, and constant voltage unit 100 is used to constant current unit 200 and LED load 300 that constant voltage is provided.
Fig. 2 is the exemplary circuit figure of the LED drive circuit that provides of the embodiment of the present invention.
Step-down integrated chip U1, division module 101, sampling feedback module 102, compensating module 103, the 3rd divider resistance R3 and shunt capacitance C3;
As one embodiment of the invention, step-down integrated chip U1 adopts MP1584 chip, the power supply input pin Vin of step-down integrated chip U1 connects power supply, the power supply output pin SW of step-down integrated chip U1 is that the output of constant voltage unit 100 connects respectively constant current unit 200 and LED load 300, the input termination power of division module 101, the chip operation of the output termination step-down integrated chip U1 of division module 101 enables pin EN, the chip oscillate frequency input pin FREQ of step-down integrated chip U1 is by the 3rd divider resistance R3 ground connection, the lower margin GND ground connection of step-down integrated chip U1, the compensation pin COMP of step-down integrated chip U1 is by compensating module 103 ground connection, the power supply output pin SW of the input termination step-down integrated chip U1 of sampling feedback module 102, the output voltage sampling feedback pin FB of the output termination step-down integrated chip U1 of sampling feedback module 102, the input pin BST of step-down integrated chip U1 meets the power supply output pin SW of step-down integrated chip U1 by shunt capacitance C3.
As one embodiment of the invention, division module 101 comprises the first divider resistance R1 and the second divider resistance R2, the first termination power of the first divider resistance R1, the chip operation that the second end of the first divider resistance R1 meets respectively step-down integrated chip U1 enables the first end of pin EN and the second divider resistance R2, the second end ground connection of the second divider resistance R2.
As one embodiment of the invention, sampling feedback module 102 comprises the 5th sampling divider resistance R5 and sampling the 6th divider resistance R6, the first end of the 5th sampling divider resistance R5 is the power supply output pin SW of the input termination step-down integrated chip U1 of sampling feedback module 102, the second end of the 5th sampling divider resistance R5 is the output voltage sampling feedback pin FB of the output termination step-down integrated chip U1 of sampling feedback module 102, and the second end of the 5th sampling divider resistance R5 is also by the 6th divider resistance R6 ground connection.
As one embodiment of the invention, compensating module 103 comprises building-out capacitor C4 and the 4th resistance R 4, the compensation pin COMP of the first termination step-down integrated chip U1 of building-out capacitor C4, and the second end of building-out capacitor C4 is by the 4th resistance R 4 ground connection.
As one embodiment of the invention, constant current unit 200 comprises constant current chip U2, constant current chip U2 adopts QX7135D chip, the supply pin vdd of constant current chip U2 connects the output of constant voltage unit 200 and the positive pole of LED load 300, the input pin out of constant current chip U2 connects the negative pole of LED load 300, the lower margin gnd ground connection of constant current chip U2.
In order to guarantee that input supply voltage steadily fluctuates and the high frequency clutter in power supply signal is coupled in filtering, side of the positive electrode and negative side at power supply have increased tantalum capacitor C 1 and high frequency capacitance C2, tantalum capacitor C 1 and high frequency capacitance C2 are connected between the power supply input pin Vin and ground of step-down integrated chip U1, LED drive circuit also comprises diode D1, inductance L 1, tantalum capacitor C 5 and filter capacitor C6, the first end of inductance L 1 connects the power supply output pin SW of step-down integrated chip U1 and the negative pole of diode D1 simultaneously, the plus earth of diode D1, the second end of inductance L 1 is respectively by tantalum capacitor C 5 and filter capacitor C6 ground connection.
After switching on power, power supply is through step-down integrated chip U1 step-down, and output constant voltage is LED load 300 and constant current chip U2 power supply, LED load 300 start with constant current work after electric, circuit is simple and convenient, reliable and stable.
Another object of the embodiment of the present invention is to provide a kind of light fixture, and light fixture comprises above-mentioned LED drive circuit.
In embodiments of the present invention, LED drive circuit comprises constant voltage unit and constant current unit, makes the output voltage of LED drive circuit constant on the rated voltage of LED load, allows the work of LED constant pressure and flow, guarantees the reliable and stable work of LED.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (5)
1. a LED drive circuit, for driving LED load, is characterized in that, described LED drive circuit comprises:
For described LED load provides the constant current unit of constant current; And
Input termination power, output connects respectively the constant voltage unit of described constant current unit and LED load, is used to described constant current unit and LED load that constant voltage is provided, and described constant voltage unit comprises:
Step-down integrated chip, division module, sampling feedback module, compensating module, the 3rd divider resistance (R3) and shunt capacitance (C3);
The power supply input pin of described step-down integrated chip connects power supply, the power supply output pin of described step-down integrated chip is that the output of constant voltage unit connects respectively described constant current unit and LED load, the input termination power of described division module, the chip operation of the output termination step-down integrated chip of described division module enables pin, the chip oscillate frequency input pin of described step-down integrated chip is by the 3rd divider resistance (R3) ground connection, the lower margin ground connection of described step-down integrated chip, the compensation pin of described step-down integrated chip is by described compensating module ground connection, the power supply output pin of the input termination step-down integrated chip of described sampling feedback module, the output voltage sampling feedback pin of the output termination step-down integrated chip of described sampling feedback module, the input pin of described step-down integrated chip connects the power supply output pin of step-down integrated chip by shunt capacitance (C3),
Described constant current unit comprises constant current chip, described constant current chip adopts QX7135D chip, the supply pin of described constant current chip connects the output of described constant voltage unit and the positive pole of LED load, and the input pin of described constant current chip connects the negative pole of described LED load, the lower margin ground connection of described constant current chip.
2. LED drive circuit as claimed in claim 1, it is characterized in that, described division module comprises the first divider resistance (R1) and the second divider resistance (R2), the first termination power of described the first divider resistance (R1), the chip operation that the second end of described the first divider resistance (R1) connects respectively step-down integrated chip enables the first end of pin and the second divider resistance (R2), the second end ground connection of described the second divider resistance (R2).
3. LED drive circuit as claimed in claim 1, it is characterized in that, described sampling feedback module comprises the 5th sampling divider resistance (R5) and sampling the 6th divider resistance (R6), the first end of described the 5th sampling divider resistance (R5) is the power supply output pin of the input termination step-down integrated chip of sampling feedback module, the second end of described the 5th sampling divider resistance (R5) is the output voltage sampling feedback pin of the output termination step-down integrated chip of sampling feedback module, the second end of described the 5th sampling divider resistance (R5) is also by the 6th divider resistance (R6) ground connection.
4. LED drive circuit as claimed in claim 1, it is characterized in that, described compensating module comprises building-out capacitor (C4) and the 4th resistance (R4), the compensation pin of the first termination step-down integrated chip of described building-out capacitor (C4), the second end of described building-out capacitor (C4) is by the 4th resistance (R4) ground connection.
5. a light fixture, is characterized in that, described light fixture comprises the LED drive circuit as described in claim 1-4 any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010539827.1A CN102469651B (en) | 2010-11-11 | 2010-11-11 | LED drive circuit and light fixture |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010539827.1A CN102469651B (en) | 2010-11-11 | 2010-11-11 | LED drive circuit and light fixture |
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| CN102469651A CN102469651A (en) | 2012-05-23 |
| CN102469651B true CN102469651B (en) | 2014-01-15 |
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| CN201010539827.1A Expired - Fee Related CN102469651B (en) | 2010-11-11 | 2010-11-11 | LED drive circuit and light fixture |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103929846A (en) * | 2013-01-16 | 2014-07-16 | 硕颉科技股份有限公司 | Light-emitting diode load driving device |
| CN103247250B (en) * | 2013-05-13 | 2016-02-03 | 深圳市华星光电技术有限公司 | The driving circuit of display module, light source module, light source module and driving method |
| CN103687243B (en) * | 2013-12-18 | 2016-10-05 | 宁波市柯玛士电器实业有限公司 | A kind of LED flashlight |
| US9265116B2 (en) * | 2014-05-30 | 2016-02-16 | Technical Consumer Products, Inc. | Constant voltage and constant current driver circuit |
| CN104202874B (en) * | 2014-09-01 | 2016-10-05 | 矽力杰半导体技术(杭州)有限公司 | The LED drive circuit of a kind of single inductance and driving method |
| CN104467504A (en) * | 2014-11-29 | 2015-03-25 | 成都思茂科技有限公司 | Low-pass filtering inverter system based on linear driving |
| CN106953393A (en) * | 2017-05-16 | 2017-07-14 | 东莞市巨星电池有限公司 | A kind of constant-current charging circuit, accumulation power supply and constant-current charge method |
| CN108989910A (en) * | 2018-09-07 | 2018-12-11 | 瑞纳智能设备股份有限公司 | A kind of low-power consumption bus takes electric MBUS communication interface circuit |
| CN109618460A (en) * | 2018-12-29 | 2019-04-12 | 广东德洛斯照明工业有限公司 | A kind of control system and method for LED light |
| CN110312348B (en) * | 2019-08-07 | 2024-05-24 | 深圳市炫鼎光电科技有限公司 | Three-point type flip constant current driving chip and LED lamp |
| CN112271924A (en) * | 2020-11-11 | 2021-01-26 | 湖北华中光电科技有限公司 | Constant-current output circuit and method based on voltage feedback of buck converter |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201440747U (en) * | 2009-07-21 | 2010-04-21 | 北京诚创星光科技有限公司 | Led series drive |
| CN201550319U (en) * | 2009-11-06 | 2010-08-11 | 林文献 | High power LED lighting precision driver |
| CN101883453A (en) * | 2009-05-05 | 2010-11-10 | 海洋王照明科技股份有限公司 | LED constant current drive circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4895854B2 (en) * | 2007-02-16 | 2012-03-14 | アルパイン株式会社 | Driver circuit |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101883453A (en) * | 2009-05-05 | 2010-11-10 | 海洋王照明科技股份有限公司 | LED constant current drive circuit |
| CN201440747U (en) * | 2009-07-21 | 2010-04-21 | 北京诚创星光科技有限公司 | Led series drive |
| CN201550319U (en) * | 2009-11-06 | 2010-08-11 | 林文献 | High power LED lighting precision driver |
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| CN102469651A (en) | 2012-05-23 |
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