CN102711311A - LED (Light Emitting Diode) driving circuit and lamp - Google Patents
LED (Light Emitting Diode) driving circuit and lamp Download PDFInfo
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- CN102711311A CN102711311A CN2011100755440A CN201110075544A CN102711311A CN 102711311 A CN102711311 A CN 102711311A CN 2011100755440 A CN2011100755440 A CN 2011100755440A CN 201110075544 A CN201110075544 A CN 201110075544A CN 102711311 A CN102711311 A CN 102711311A
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- divider resistance
- led lamp
- drive circuit
- power supply
- led
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- 239000004065 semiconductor Substances 0.000 claims abstract description 26
- 239000003990 capacitor Substances 0.000 claims description 12
- 230000003321 amplification Effects 0.000 abstract description 3
- 238000003199 nucleic acid amplification method Methods 0.000 abstract description 3
- 240000007320 Pinus strobus Species 0.000 abstract 2
- 229910044991 metal oxide Inorganic materials 0.000 abstract 1
- 150000004706 metal oxides Chemical class 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 4
- 238000005286 illumination Methods 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
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Abstract
The invention is suitable for the field of lamps and provides an LED (Light Emitting Diode) driving circuit. The LED driving circuit is connected with a power supply and an LED lamp respectively, and comprises a P type MOS (Metal Oxide Semiconductor) tube Q4, a control unit and an amplification unit. According to the LED driving circuit, the P type MOS tube controls the power supply to make-and-break the power supply of the LED lamp according to the frequency of PWM (Pulse Wavelength Modulation) signals output by the control unit, and the LED lamp strobes, so that besides the long-time lighting of the LED lamp, the strobe function is additionally provided for the LED lamp, and the signal flickering and the lighting are integrated into a whole.
Description
Technical field
The invention belongs to field of light fittings, relate in particular to a kind of led drive circuit and light fixture.
Background technology
Along with the continuous development of science and technology, the new product new technology is constantly reformed, and LED is as new type light source; It has energy-saving and environmental protection, characteristics of high efficiency; Technology is ripe and be applied to every field, and LED is widely used as lighting source, various led drive circuits also occurred thereupon.
Existing led drive circuit can only make the LED lamp long bright usually, and therefore, existing LED light fixture can only be made illuminating lamp and use, function singleness.
Summary of the invention
Main purpose of the present invention is to provide a kind of led drive circuit, is intended to solve existing LED light fixture existence and can only does illuminating lamp use, the problem of function singleness.
The present invention is achieved in that a kind of led drive circuit, is connected with the LED lamp with power supply respectively, and said led drive circuit comprises:
Source electrode connects said power supply, and it is anodal that drain electrode connects said LED lamp, controls said power supply to LED lamp power supply break-make, makes the P type metal-oxide-semiconductor Q4 of said LED lamp stroboscopic;
Control unit is used to export the pwm signal to LED lamp flicker control; And
Amplifying unit, the output of the said control unit of its input termination, the grid of the said P type of output termination metal-oxide-semiconductor Q4 is used for the pwm signal of said control unit output is amplified;
Said amplifying unit comprises: NPN type triode Q1, positive-negative-positive triode Q2, NPN type triode Q3, divider resistance R4, divider resistance R5, divider resistance R6 and divider resistance R7;
First end of said divider resistance R7 is the input of said amplifying unit; The base stage of the second termination NPN type triode Q3 of said divider resistance R7; Said divider resistance R6 is connected between the base stage and ground of said NPN type triode Q3; The grounded emitter of said NPN type triode Q3; The collector electrode of said NPN type triode Q3 connects the base stage of said NPN type triode Q1 and positive-negative-positive triode Q2 simultaneously, and said divider resistance R5 is connected between the collector electrode and ground of said positive-negative-positive triode Q2, and the emitter of said NPN type triode Q1 and the emitter of positive-negative-positive triode Q2 connect the grid of said P type metal-oxide-semiconductor Q4 simultaneously; The collector electrode of said NPN type triode Q1 connects the source electrode of said P type metal-oxide-semiconductor Q4, and said divider resistance R4 is connected between the collector electrode and base stage of said NPN type triode Q1.
Another object of the present invention is to provide a kind of light fixture that comprises above-mentioned led drive circuit.
In the present invention, P type metal-oxide-semiconductor is according to the frequency of the pwm signal of control unit output, and the control power supply makes LED lamp stroboscopic to LED lamp power supply break-make, makes the LED lamp on long bright basis, has also increased the function of stroboscopic, and the signal flicker is integrated in one with illumination.
Description of drawings
Fig. 1 is the module map of the led drive circuit in the embodiment of the invention;
Fig. 2 is the examples of circuits figure of the led drive circuit in the embodiment of the invention.
Embodiment
In order to make the object of the invention, principle and advantage clearer,, the present invention is further elaborated below in conjunction with accompanying drawing and embodiment.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 modular structure of the led drive circuit that the embodiment of the invention provides, and for the ease of explanation, only shows the part relevant with the embodiment of the invention, and details are as follows.
Led drive circuit is connected with the LED lamp with power supply respectively, and led drive circuit comprises P type metal-oxide-semiconductor Q4, control unit 100 and amplifying unit 200;
The source electrode of P type metal-oxide-semiconductor Q4 connects power supply, and it is anodal that drain electrode connects the LED lamp, and the control power supply makes LED lamp stroboscopic to LED lamp power supply break-make;
Control unit 100 is used to export the pwm signal to LED lamp flicker control;
Amplifying unit 200, the output OUT of its input termination control unit 100, the grid of output termination P type metal-oxide-semiconductor Q4 is used for the pwm signal of control unit 100 outputs is amplified;
Amplifying unit 200 comprises: NPN type triode Q1, positive-negative-positive triode Q2, NPN type triode Q3, divider resistance R4, divider resistance R5, divider resistance R6 and divider resistance R7;
First end of divider resistance R7 is the input of amplifying unit 200; The base stage of the second termination NPN type triode Q3 of divider resistance R7; Divider resistance R6 is connected between the base stage and ground of NPN type triode Q3; The grounded emitter of NPN type triode Q3; The collector electrode of NPN type triode Q3 connects the base stage of NPN type triode Q1 and positive-negative-positive triode Q2 simultaneously, and divider resistance R5 is connected between the collector electrode and ground of positive-negative-positive triode Q2, and the emitter of NPN type triode Q1 and the emitter of positive-negative-positive triode Q2 connect the grid of P type metal-oxide-semiconductor Q4 simultaneously; The collector electrode of NPN type triode Q1 connects the source electrode of P type metal-oxide-semiconductor Q4, and divider resistance R4 is connected between the collector electrode and base stage of NPN type triode Q1.
As one embodiment of the invention, led drive circuit also comprises:
Supply power voltage detecting unit 300; It imports termination LED lamp negative pole, exports the first test side FB1 of termination control unit 100, is used to detect the supply power voltage of LED lamp; Whether the supply power voltage of judging the LED lamp for control unit 100 is reduced to below the standard value; If control unit 100 control P type metal-oxide-semiconductor Q4 regulate the break-make of power supply to the power supply of LED lamp, increase the flicker frequency of LED lamp or the LED lamp is extinguished.
As one embodiment of the invention, led drive circuit also comprises:
Input voltage detecting unit 400, it imports termination power, and the second test side FB2 of output termination control unit 100 is used to detect input voltage.
Fig. 2 shows the examples of circuits structure of the led drive circuit that the embodiment of the invention provides, and for the ease of explanation, only shows the part relevant with the embodiment of the invention, and details are as follows.
As one embodiment of the invention, supply power voltage detecting unit 300 comprises:
Divider resistance R8, divider resistance R9 and capacitor C 4;
First end of divider resistance R8 and divider resistance R9 is the input termination LED lamp negative pole of supply power voltage detecting unit 300; The second end ground connection of divider resistance R9; Capacitor C 4 is connected between second end and ground of divider resistance R8, and second end of divider resistance R8 is the output of supply power voltage detecting unit 300.
As one embodiment of the invention, input voltage detecting unit 400 comprises:
Divider resistance R1, divider resistance R2, divider resistance R3 and capacitor C 1;
First end of divider resistance R1 is the input of input voltage detecting unit 400; Second end of divider resistance R1 connects first end of divider resistance R2 and first end of divider resistance R3 simultaneously; The second end ground connection of divider resistance R2; Second end of divider resistance R3 is the output of input voltage detecting unit 400, and capacitor C 1 is connected between second end and ground of divider resistance R3.
As one embodiment of the invention; Led drive circuit also comprises the switch SW 1 that is used to realize the long bright or stroboscopic control of LED lamp; The first end ground connection of switch SW 1; Second end one tunnel of switch SW 1 meets the input IN of control unit 100, and another road of second end of switch SW 1 connects power supply through divider resistance R10.
As one embodiment of the invention, led drive circuit also comprises diode D1, and diode D1 is connected between the source electrode of power supply and P type metal-oxide-semiconductor Q4, is used to prevent the power supply reversal connection.
As one embodiment of the invention, led drive circuit also comprises capacitor C 2, and capacitor C 2 is connected between the negative electrode and ground of diode D1.
As one embodiment of the invention; Led drive circuit also comprises inductance L 2, diode D2 and capacitor C 3; Inductance L 2 is connected between P type metal-oxide-semiconductor Q4 and the LED lamp positive pole, the drain electrode of the first termination P type metal-oxide-semiconductor Q4 of inductance L 2, and the second termination LED lamp of inductance L 2 is anodal; Diode D2 is connected between first end and ground of inductance L 2, and capacitor C 3 is connected between second end and ground of inductance L 2.
The power end VDD of control unit 100 connects power supply through voltage regulation unit, and as one embodiment of the invention, it is the single-chip microcomputer of HT66F03C that control unit 100 adopts model.
The operation principle of led drive circuit is:
When the user wants LED lamp stroboscopic, only need console switch SW1, the input IN of control unit 100 is connected with switch SW 1; After control unit 100 is experienced the level variation of its input IN; Through output OUT output pwm signal, the grid of P type metal-oxide-semiconductor Q4 is accepted through the pwm signal after amplifying unit 200 amplifications, P type metal-oxide-semiconductor Q4 conducting and disconnection under the control of pwm signal; The break-make of control LED lamp current supply circuit makes LED lamp stroboscopic.
When the user wants LED lamp length bright; Also only need console switch SW1, the input IN of control unit 100 is connected with switch SW 1, after control unit 100 is experienced the level variation of its input IN; Through the higher pwm signal of output OUT output frequency; The grid of P type metal-oxide-semiconductor Q4 is accepted through the pwm signal after amplifying unit 200 amplifications, P type metal-oxide-semiconductor Q4 conducting and disconnection under the control of pwm signal, the break-make of control LED lamp current supply circuit; Because the break-make frequency of LED lamp current supply circuit is very high, institute is so that the user thinks that the LED lamp is long bright.
The embodiment of the invention also provides a kind of light fixture that comprises above-mentioned led drive circuit.
In embodiments of the present invention, P type metal-oxide-semiconductor is according to the frequency of the pwm signal of control unit output, and the control power supply is to LED lamp power supply break-make; Make LED lamp stroboscopic; Make the LED lamp on long bright basis, also increased the function of stroboscopic, the signal flicker is integrated in one with illumination.
The above is merely preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of within spirit of the present invention and principle, being done, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. a led drive circuit is connected with the LED lamp with power supply respectively, it is characterized in that said led drive circuit comprises:
Source electrode connects said power supply, and it is anodal that drain electrode connects said LED lamp, controls said power supply to LED lamp power supply break-make, makes the P type metal-oxide-semiconductor Q4 of said LED lamp stroboscopic;
Control unit is used to export the pwm signal to LED lamp flicker control; And
Amplifying unit, the output of the said control unit of its input termination, the grid of the said P type of output termination metal-oxide-semiconductor Q4 is used for the pwm signal of said control unit output is amplified;
Said amplifying unit comprises: NPN type triode Q1, positive-negative-positive triode Q2, NPN type triode Q3, divider resistance R4, divider resistance R5, divider resistance R6 and divider resistance R7;
First end of said divider resistance R7 is the input of said amplifying unit; The base stage of the second termination NPN type triode Q3 of said divider resistance R7; Said divider resistance R6 is connected between the base stage and ground of said NPN type triode Q3; The grounded emitter of said NPN type triode Q3; The collector electrode of said NPN type triode Q3 connects the base stage of said NPN type triode Q1 and positive-negative-positive triode Q2 simultaneously, and said divider resistance R5 is connected between the collector electrode and ground of said positive-negative-positive triode Q2, and the emitter of said NPN type triode Q1 and the emitter of positive-negative-positive triode Q2 connect the grid of said P type metal-oxide-semiconductor Q4 simultaneously; The collector electrode of said NPN type triode Q1 connects the source electrode of said P type metal-oxide-semiconductor Q4, and said divider resistance R4 is connected between the collector electrode and base stage of said NPN type triode Q1.
2. led drive circuit as claimed in claim 1 is characterized in that, said led drive circuit also comprises:
The supply power voltage detecting unit; Its input termination said LED lamp negative pole, first test side of the said control unit of output termination is used to detect the supply power voltage of said LED lamp; Whether the supply power voltage of judging the LED lamp for said control unit is reduced to below the standard value; If said control unit control P type metal-oxide-semiconductor Q4 regulates the break-make of power supply to the power supply of LED lamp, increases the flicker frequency of said LED lamp or said LED lamp is extinguished.
3. led drive circuit as claimed in claim 1 is characterized in that, said led drive circuit also comprises:
The input voltage detecting unit, the said power supply of its input termination, second test side of the said control unit of output termination is used to detect input voltage.
4. led drive circuit as claimed in claim 2 is characterized in that, said supply power voltage detecting unit comprises:
Divider resistance R8, divider resistance R9 and capacitor C 4;
First end of said divider resistance R8 and divider resistance R9 is the said LED lamp of the input termination negative pole of said supply power voltage detecting unit; The second end ground connection of said divider resistance R9; Said capacitor C 4 is connected between second end and ground of divider resistance R8, and second end of said divider resistance R8 is the output of said supply power voltage detecting unit.
5. led drive circuit as claimed in claim 3 is characterized in that, said input voltage detecting unit comprises:
Divider resistance R1, divider resistance R2, divider resistance R3 and capacitor C 1;
First end of said divider resistance R1 is the input of input voltage detecting unit; Second end of said divider resistance R1 connects first end of divider resistance R2 and first end of divider resistance R3 simultaneously; The second end ground connection of said divider resistance R2; Second end of said divider resistance R3 is the output of input voltage detecting unit, and said capacitor C 1 is connected between second end and ground of divider resistance R3.
6. led drive circuit as claimed in claim 1; It is characterized in that; Said led drive circuit also comprises the switch SW 1 that is used to realize the long bright or stroboscopic control of said LED lamp; The first end ground connection of said switch SW 1, second end one tunnel of said switch SW 1 connects the input of said control unit, and another road of second end of said switch SW 1 connects said power supply through divider resistance R10.
7. led drive circuit as claimed in claim 1 is characterized in that, said led drive circuit also comprises the diode D1 between the source electrode that is connected power supply and P type metal-oxide-semiconductor Q4.
8. a light fixture comprises power supply and LED lamp, it is characterized in that, said light fixture also comprises each described led drive circuit like claim 1-7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110075544.0A CN102711311B (en) | 2011-03-28 | 2011-03-28 | LED (Light Emitting Diode) driving circuit and lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110075544.0A CN102711311B (en) | 2011-03-28 | 2011-03-28 | LED (Light Emitting Diode) driving circuit and lamp |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102711311A true CN102711311A (en) | 2012-10-03 |
| CN102711311B CN102711311B (en) | 2014-06-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110075544.0A Expired - Fee Related CN102711311B (en) | 2011-03-28 | 2011-03-28 | LED (Light Emitting Diode) driving circuit and lamp |
Country Status (1)
| Country | Link |
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| CN (1) | CN102711311B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103533714A (en) * | 2013-10-23 | 2014-01-22 | 青岛歌尔声学科技有限公司 | LED (light-emitting diode) lamp control circuit system |
| CN104955197A (en) * | 2014-03-25 | 2015-09-30 | 深圳市海洋王照明工程有限公司 | Voltage detecting circuit and lamp |
| CN107197558A (en) * | 2017-05-05 | 2017-09-22 | 深圳市晟瑞科技有限公司 | Address, group, scene and the DMX512 light modulators for dimming parameter can be set |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5282039A (en) * | 1991-03-29 | 1994-01-25 | U.S. Philips Corporation | Video signal amplifier arrangement for a television display tube |
| CN101483951A (en) * | 2009-02-16 | 2009-07-15 | 湖南力芯电子科技有限责任公司 | LED driver and method for driving LED |
| CN101404846B (en) * | 2008-11-17 | 2011-12-28 | 南京智浦芯联电子科技有限公司 | Real-time compensation apparatus for input voltage fluctuation in power LED driving system |
| CN101489342B (en) * | 2009-02-27 | 2012-08-29 | 杭州士兰微电子股份有限公司 | LED driver circuit and driving method thereof |
-
2011
- 2011-03-28 CN CN201110075544.0A patent/CN102711311B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5282039A (en) * | 1991-03-29 | 1994-01-25 | U.S. Philips Corporation | Video signal amplifier arrangement for a television display tube |
| CN101404846B (en) * | 2008-11-17 | 2011-12-28 | 南京智浦芯联电子科技有限公司 | Real-time compensation apparatus for input voltage fluctuation in power LED driving system |
| CN101483951A (en) * | 2009-02-16 | 2009-07-15 | 湖南力芯电子科技有限责任公司 | LED driver and method for driving LED |
| CN101489342B (en) * | 2009-02-27 | 2012-08-29 | 杭州士兰微电子股份有限公司 | LED driver circuit and driving method thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103533714A (en) * | 2013-10-23 | 2014-01-22 | 青岛歌尔声学科技有限公司 | LED (light-emitting diode) lamp control circuit system |
| CN104955197A (en) * | 2014-03-25 | 2015-09-30 | 深圳市海洋王照明工程有限公司 | Voltage detecting circuit and lamp |
| CN107197558A (en) * | 2017-05-05 | 2017-09-22 | 深圳市晟瑞科技有限公司 | Address, group, scene and the DMX512 light modulators for dimming parameter can be set |
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| Publication number | Publication date |
|---|---|
| CN102711311B (en) | 2014-06-25 |
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