CN102711311B - LED (Light Emitting Diode) driving circuit and lamp - Google Patents
LED (Light Emitting Diode) driving circuit and lampDownload PDFInfo
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- CN102711311B CN102711311BCN201110075544.0ACN201110075544ACN102711311BCN 102711311 BCN102711311 BCN 102711311BCN 201110075544 ACN201110075544 ACN 201110075544ACN 102711311 BCN102711311 BCN 102711311B
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- divider resistance
- led lamp
- drive circuit
- power supply
- led
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Abstract
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 scientific and technical development, New Products & New Technology is constantly reformed, and LED is as new type light source, it has energy-saving and environmental protection, efficient feature, 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.
Existing LED drive circuit can only make LED lamp long bright conventionally, and therefore, existing LED light fixture can only make 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 respectively with power supply and LED lamp, and described LED drive circuit comprises:
Source electrode connects described power supply, and drain electrode connects described LED lamp positive pole, controls described power supply to LED lamp power supply break-make, makes the P type metal-oxide-semiconductor Q4 of described LED lamp stroboscopic;
Control unit, for exporting the pwm signal that flicker is controlled to LED lamp; And
Amplifying unit, the output of control unit described in its input termination, the grid of P type metal-oxide-semiconductor Q4 described in output termination, for amplifying the pwm signal of described control unit output;
Described 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;
The first end of described divider resistance R7 is the input of described amplifying unit, the base stage of the second termination NPN type triode Q3 of described divider resistance R7, described divider resistance R6 is connected between the base stage and ground of described NPN type triode Q3, the grounded emitter of described NPN type triode Q3, the collector electrode of described NPN type triode Q3 connects the base stage of described NPN type triode Q1 and positive-negative-positive triode Q2 simultaneously, described divider resistance R5 is connected between the collector electrode and ground of described positive-negative-positive triode Q2, the emitter of described NPN type triode Q1 and the emitter of positive-negative-positive triode Q2 connect the grid of described P type metal-oxide-semiconductor Q4 simultaneously, the collector electrode of described NPN type triode Q1 connects the source electrode of described P type metal-oxide-semiconductor Q4, described divider resistance R4 is connected between the collector electrode and base stage of described 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, according to the frequency of the pwm signal of control unit output, is controlled power supply to LED lamp power supply break-make, makes LED lamp stroboscopic, makes LED lamp on long bright basis, has also increased the function of stroboscopic, and signal flicker is integrated in one with illumination.
Accompanying drawing explanation
Fig. 1 is the module map of the LED drive circuit in the embodiment of the present invention;
Fig. 2 is the examples of circuits figure of the LED drive circuit in the embodiment of the present invention.
Embodiment
In order to make object of the present invention, principle 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 modular structure of the LED drive circuit that the embodiment of the present invention provides, and for convenience of explanation, only shows the part relevant to the embodiment of the present invention, and details are as follows.
LED drive circuit, is connected with power supply and LED lamp respectively, and LED drive circuit comprises P type metal-oxide-semiconductor Q4,control unit 100 and amplifyingunit 200;
The source electrode of P type metal-oxide-semiconductor Q4 connects power supply, and drain electrode connects LED lamp positive pole, controls power supply to LED lamp power supply break-make, makes LED lamp stroboscopic;
Amplifyingunit 200, the output OUT of its inputtermination control unit 100, the grid of output termination P type metal-oxide-semiconductor Q4, amplifies for the pwm signal thatcontrol unit 100 is exported;
Amplifyingunit 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;
The first end of divider resistance R7 is the input of amplifyingunit 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, divider resistance R5 is connected between the collector electrode and ground of positive-negative-positive triode Q2, 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, 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 powervoltage detecting unit 300, its input termination LED lamp negative pole, the first test side FB1 of outputtermination control unit 100, for detection of the supply power voltage of LED lamp, whether the supply power voltage that judges LED lamp forcontrol unit 100 is reduced to below standard value, if so,control unit 100 is controlled P type metal-oxide-semiconductor Q4 and is regulated the break-make of power supply to the power supply of LED lamp, increases the flicker frequency of LED lamp or LED lamp is extinguished.
As one embodiment of the invention, LED drive circuit also comprises:
Inputvoltage detecting unit 400, it inputs termination power, and the second test side FB2 of outputtermination control unit 100, for detection of input voltage.
Fig. 2 shows the examples of circuits structure of the LED drive circuit that the embodiment of the present invention provides, and for convenience of explanation, only shows the part relevant to the embodiment of the present invention, and details are as follows.
As one embodiment of the invention, supply powervoltage detecting unit 300 comprises:
Divider resistance R8, divider resistance R9 and capacitor C 4;
The first end of divider resistance R8 and divider resistance R9 is the input termination LED lamp negative pole of supply powervoltage detecting unit 300, the second end ground connection of divider resistance R9, capacitor C 4 is connected between the second end and ground of divider resistance R8, and the second end of divider resistance R8 is the output of supply powervoltage detecting unit 300.
As one embodiment of the invention, inputvoltage detecting unit 400 comprises:
Divider resistance R1, divider resistance R2, divider resistance R3 and capacitor C 1;
The first end of divider resistance R1 is the input of inputvoltage detecting unit 400, the second end of divider resistance R1 connects the first end of divider resistance R2 and the first end of divider resistance R3 simultaneously, the second end ground connection of divider resistance R2, the second end of divider resistance R3 is the output of inputvoltage detecting unit 400, and capacitor C 1 is connected between the second end and ground of divider resistance R3.
As one embodiment of the invention, LED drive circuit also comprises the switch SW 1 of growing bright or frequent flashing control for realizing LED lamp, the first end ground connection of switch SW 1, the second Duan Yi road of switch SW 1 meets the input IN ofcontrol unit 100, and the second end of switch SW 1 is separately leaded up to divider resistance R10 and connect power supply.
As one embodiment of the invention, LED drive circuit also comprises diode D1, and diode D1 is connected between power supply and the source electrode of P type metal-oxide-semiconductor Q4, for preventing reverse power 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 andcapacitor C 3, inductance L 2 is connected between P type metal-oxide-semiconductor Q4 and LED lamp positive pole, the drain electrode of the first termination P type metal-oxide-semiconductor Q4 of inductance L 2, the second termination LED lamp positive pole of inductance L 2, diode D2 is connected between the first end and ground of inductance L 2, andcapacitor C 3 is connected between second end and ground of inductance L 2.
The power end VDD ofcontrol unit 100 connects power supply by voltage regulation unit, and as one embodiment of the invention, it is the single-chip microcomputer of HT66F03C thatcontrol unit 100 adopts model.
The operation principle of LED drive circuit is:
In the time that user wants LED lamp stroboscopic, only need console switch SW1, the input IN ofcontrol unit 100 is connected with switch SW 1,control unit 100 is experienced after the level variation of its input IN, by output OUT output pwm signal, the grid of P type metal-oxide-semiconductor Q4 is accepted the pwm signal after amplifyingunit 200 amplifies, P type metal-oxide-semiconductor Q4 conducting and disconnection under the control of pwm signal, the break-make of controlling LED lamp current supply circuit, makes LED lamp stroboscopic.
In the time that user wants LED lamp length bright, also only need console switch SW1, the input IN ofcontrol unit 100 is connected with switch SW 1,control unit 100 is experienced after the level variation of its input IN, by the higher pwm signal of output OUT output frequency, the grid of P type metal-oxide-semiconductor Q4 is accepted the pwm signal after amplifyingunit 200 amplifies, P type metal-oxide-semiconductor Q4 conducting and disconnection under the control of pwm signal, control the break-make of LED lamp current supply circuit, because the break-make frequency of LED lamp current supply circuit is very high, so make user think that LED lamp is long bright.
The embodiment of the present 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, according to the frequency of the pwm signal of control unit output, is controlled power supply to LED lamp power supply break-make, make LED lamp stroboscopic, make LED lamp on long bright basis, also increased the function of stroboscopic, signal flicker is integrated in one with illumination.
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 (7)
1. a LED drive circuit, is connected with power supply and LED lamp respectively, it is characterized in that, described LED drive circuit comprises:
Source electrode connects described power supply, and drain electrode connects described LED lamp positive pole, controls described power supply to LED lamp power supply break-make, makes the P type metal-oxide-semiconductor Q4 of described LED lamp stroboscopic;
Control unit, for exporting the pwm signal that flicker is controlled to LED lamp; And
Amplifying unit, the output of control unit described in its input termination, the grid of P type metal-oxide-semiconductor Q4 described in output termination, for amplifying the pwm signal of described control unit output;
Described 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;
The first end of described divider resistance R7 is the input of described amplifying unit, the base stage of the second termination NPN type triode Q3 of described divider resistance R7, described divider resistance R6 is connected between the base stage and ground of described NPN type triode Q3, the grounded emitter of described NPN type triode Q3, the collector electrode of described NPN type triode Q3 connects the base stage of described NPN type triode Q1 and positive-negative-positive triode Q2 simultaneously, described divider resistance R5 is connected between the collector electrode and ground of described positive-negative-positive triode Q2, the emitter of described NPN type triode Q1 and the emitter of positive-negative-positive triode Q2 connect the grid of described P type metal-oxide-semiconductor Q4 simultaneously, the collector electrode of described NPN type triode Q1 connects the source electrode of described P type metal-oxide-semiconductor Q4, described divider resistance R4 is connected between the collector electrode and base stage of described NPN type triode Q1,
Described LED drive circuit also comprises:
Supply power voltage detecting unit, LED lamp negative pole described in its input termination, the first test side of control unit described in output termination, for detection of the supply power voltage of described LED lamp, whether the supply power voltage that judges LED lamp for described control unit is reduced to below standard value, if so, described 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 described LED lamp or described LED lamp is extinguished.
2. LED drive circuit as claimed in claim 1, is characterized in that, described LED drive circuit also comprises:
Input voltage detecting unit, power supply described in its input termination, the second test side of control unit described in output termination, for detection of input voltage.
3. LED drive circuit as claimed in claim 1, is characterized in that, described supply power voltage detecting unit comprises:
Divider resistance R8, divider resistance R9 and capacitor C 4;
The first end of described divider resistance R8 and divider resistance R9 is LED lamp negative pole described in the input termination of described supply power voltage detecting unit, the second end ground connection of described divider resistance R9, described capacitor C 4 is connected between the second end and ground of divider resistance R8, and the second end of described divider resistance R8 is the output of described supply power voltage detecting unit.
4. LED drive circuit as claimed in claim 2, is characterized in that, described input voltage detecting unit comprises:
Divider resistance R1, divider resistance R2, divider resistance R3 and capacitor C 1;
The first end of described divider resistance R1 is the input of input voltage detecting unit, the second end of described divider resistance R1 connects the first end of divider resistance R2 and the first end of divider resistance R3 simultaneously, the second end ground connection of described divider resistance R2, the second end of described divider resistance R3 is the output of input voltage detecting unit, and described capacitor C 1 is connected between the second end and ground of divider resistance R3.
5. LED drive circuit as claimed in claim 1, it is characterized in that, described LED drive circuit also comprises the switch SW 1 of growing bright or frequent flashing control for realizing described LED lamp, the first end ground connection of described switch SW 1, the second Duan Yi road of described switch SW 1 connects the input of described control unit, and the second end of described switch SW 1 is separately leaded up to divider resistance R10 and connect described power supply.
6. LED drive circuit as claimed in claim 1, is characterized in that, described LED drive circuit also comprises the diode D1 being connected between power supply and the source electrode of P type metal-oxide-semiconductor Q4.
7. a light fixture, comprises power supply and LED lamp, it is characterized in that, described light fixture also comprises the LED drive circuit as described in claim 1-6 any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110075544.0ACN102711311B (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 |
|---|---|---|---|
| CN201110075544.0ACN102711311B (en) | 2011-03-28 | 2011-03-28 | LED (Light Emitting Diode) driving circuit and lamp |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102711311A CN102711311A (en) | 2012-10-03 |
| CN102711311Btrue CN102711311B (en) | 2014-06-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201110075544.0AExpired - Fee RelatedCN102711311B (en) | 2011-03-28 | 2011-03-28 | LED (Light Emitting Diode) driving circuit and lamp |
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Families Citing this family (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 (2)
| 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 |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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
- 2011-03-28CNCN201110075544.0Apatent/CN102711311B/ennot_activeExpired - Fee Related
Patent Citations (2)
| 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 |
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| CN102711311A (en) | 2012-10-03 |
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