CN102651930A - LED (Light-Emitting Diode) dimming drive circuit - Google Patents
LED (Light-Emitting Diode) dimming drive circuit Download PDFInfo
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- CN102651930A CN102651930A CN2011100465880A CN201110046588A CN102651930A CN 102651930 A CN102651930 A CN 102651930A CN 2011100465880 A CN2011100465880 A CN 2011100465880A CN 201110046588 A CN201110046588 A CN 201110046588A CN 102651930 A CN102651930 A CN 102651930A
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Abstract
The invention discloses an LED (Light-Emitting Diode) dimming drive circuit, comprising a dimming control unit, a dimming output unit and a subsequent-flow loop unit, wherein the dimming control unit is electrically connected between a power supply and the dimming output unit, and is used for outputting PWM (Pulse Width Modulation) pulse; and the PWM pulse passes through the dimming output unit and controls the brightness of an LED through the subsequent-flow loop unit so as to realize dimming of the LED. The LED dimming drive circuit provided by the invention has the advantages that an integrated dimming control chip is adopted, the A/D values of a PB0 pin and a PB4 pin are compared by utilizing the chip, the output pulse width of a PB3 pin is readjusted after comparison, and in such circulating mode, the dimming purpose is achieved.
Description
Technical field
The present invention relates to a kind of LED light modulation drive circuit, especially relate to a kind of LED light modulation drive circuit that is used on the portable lamp.
Background technology
LED is as new type light source, and it has energy-saving and environmental protection, characteristics of high efficiency, just is being applied to every field and is being widely used, and various led drive circuits also occurred thereupon.At present in the place of low-voltage, adopt the DC-DC chopper circuit to come driving LED basically, it has, and power consumption is little, efficient is high, reliable and stable, advantage such as the unit power volume is little, in light weight; But the DC-DC chopper circuit can't be realized the continuous light tuning function to LED, has brought very big inconvenience to the user.
Summary of the invention
The object of the present invention is to provide a kind of efficient, simple LED light modulation drive circuit.
Technical scheme of the present invention is following:
A kind of LED light modulation drive circuit, this circuit comprises dimming control unit, light modulation output unit and continuous current circuit unit; Said dimming control unit is electrically connected between power supply and the said light modulation output unit, is used to export pwm pulse, and this pwm pulse is realized the LED light modulation through said light modulation output unit and via the brightness of said continuous current circuit unit controls LED; Wherein, said light modulation output unit comprises the first current-limiting resistance R6, drives triode Q2, the second current-limiting resistance R5, switch triode Q1 and the 3rd divider resistance R3; The base stage of said driving triode Q2 is electrically connected with said dimming control unit through the first current-limiting resistance R6; The grounded emitter of said driving triode Q2; The collector electrode of said driving triode Q2 is electrically connected with the base stage of said switch triode Q1 through the said second current-limiting resistance R5; The emitter of said switch triode Q1 and collector electrode are connected in series on the cathode circuit of power supply, and collector electrode is electrically connected with said continuous current circuit unit; Said the 3rd divider resistance R3 is connected electrically between the emitter and base stage of said switch triode Q1.
Described LED light modulation drive circuit, wherein, said dimming control unit comprises brightness adjustment control chip U1, the first divider resistance R1, the second divider resistance R2, mains switch K1, light adjusting potentiometer W1 and current sampling resistor R4; The operating voltage pin VCC of said brightness adjustment control chip U1 is connected with the positive electrical of power supply; The end of said mains switch K1 is connected with the positive electrical of power supply through the said first divider resistance R1; The other end is connected with the negative pole of said power supply, and said mains switch K1 is electrically connected with the power supply input pin PB1 of said brightness adjustment control chip U1 with the electric connection point of the said first divider resistance R1; The end of said light adjusting potentiometer W1 is connected with the positive electrical of power supply through the said second divider resistance R2; The other end is connected with the negative pole of said power supply, and the centre tap of said light adjusting potentiometer W1 is electrically connected with the brightness adjustment control pin PB0 of said brightness adjustment control chip U1; The feedback pin PB4 of said brightness adjustment control chip U1 is connected with the negative electricity of power supply through current sampling resistor R4; The light modulation output pin PB3 of said brightness adjustment control chip U1 is electrically connected with the first current-limiting resistance R6 of said light modulation output unit.
Described LED light modulation drive circuit, wherein, this circuit also comprises the continuous current circuit unit, this continuous current circuit unit comprises sustained diode 1, afterflow inductance L 1, filtering energy storage capacitor C 1; The plus earth of said sustained diode 1, negative pole is connected with the positive electrical of power supply; Said afterflow inductance L 1 is connected on the positive pole of power supply, and an end is connected with the negative electricity of said sustained diode 1, and the other end is through said filtering energy storage capacitor C 1 ground connection; Said afterflow inductance L 1 is connected with the positive electrical of said LED with the tie point of said filtering energy storage capacitor C 1.
Described LED light modulation drive circuit, wherein, the model of said brightness adjustment control chip U1 is TINY13V; The model of said driving triode Q2 is the NPN type triode of T617; Said switch triode Q1 is the positive-negative-positive triode.
Compared with prior art, LED light modulation drive circuit provided by the invention adopts integrated brightness adjustment control chip, utilizes chip that the A/D value of PB0 pin and PB4 pin is compared, and adjusts the output pulse width of PB3 pin after comparing again; So circulation, thus reach the order of light modulation; Simultaneously, this circuit also have efficiently, advantage such as reliable, cheap, simple and anti-High-frequency Interference.
Description of drawings
Fig. 1 is a LED light modulation drive circuit block diagram of the present invention;
Fig. 2 is a LED light modulation drive circuit schematic diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, further explain is done in preferred embodiment of the present invention.
As illustrated in fig. 1 and 2, a kind of LED light modulation drive circuit comprises dimming control unit 20, light modulation output unit 30 and continuous current circuit unit 40; Dimming control unit 20 is electrically connected between power supply 10 and the light modulation output unit 30, is used to export pwm pulse, and this pwm pulse is realized the LED50 light modulation through light modulation output unit 30 and via the brightness of continuous current circuit unit 40 control LED; Wherein, light modulation output unit 40 comprises the first current-limiting resistance R6, drives triode Q2, the second current-limiting resistance R5, switch triode Q1 and the 3rd divider resistance R3; The base stage that drives triode Q2 is electrically connected with said dimming control unit through the first current-limiting resistance R6; Drive the grounded emitter of triode Q2; The collector electrode of said driving triode Q2 is electrically connected with the base stage of switch triode Q1 through the second current-limiting resistance R5; The emitter of said switch triode Q1 and collector electrode are connected in series on the cathode circuit of power supply, and collector electrode is electrically connected with said continuous current circuit unit; Said the 3rd divider resistance R3 is connected electrically between the emitter and base stage of said switch triode Q1; Among this embodiment, power supply 10 adopts dc-battery BT1.
In the above-mentioned LED light modulation drive circuit, dimming control unit 20 comprises that model is brightness adjustment control chip U1, the first divider resistance R1, the second divider resistance R2, mains switch K1, light adjusting potentiometer W1 and the current sampling resistor R4 of TINY13V.The operating voltage pin VCC of brightness adjustment control chip U1 is connected with the positive electrical of power supply 10; The end of mains switch K1 is connected with the positive electrical of power supply through the first divider resistance R1; The other end is connected with the negative pole of power supply 10, and mains switch K1 is electrically connected with the power supply input pin PB1 of brightness adjustment control chip U1 with the electric connection point of the first divider resistance R1; The end of light adjusting potentiometer W1 is connected with the positive electrical of power supply through the second divider resistance R2, and the other end is connected with the negative pole of power supply 10, and the centre tap of light adjusting potentiometer W1 is electrically connected with the brightness adjustment control pin PB0 of brightness adjustment control chip U1; The feedback pin PB4 of brightness adjustment control chip U1 is connected with the negative electricity of LED50, and tie point is connected the lower margin GND ground connection of brightness adjustment control chip U1 through current sampling resistor R4 with the negative electricity of power supply 10; The light modulation output pin PB3 of brightness adjustment control chip U1 is electrically connected with the first current-limiting resistance R6 of light modulation output unit 30, is used to export pwm pulse.
And the continuous current circuit unit 40 of this circuit, it comprises sustained diode 1, afterflow inductance L 1, filtering energy storage capacitor C 1; The plus earth of sustained diode 1, negative pole is connected with the positive electrical of power supply; Afterflow inductance L 1 is connected on the positive pole of power supply, and an end is connected with the negative electricity of sustained diode 1, and the other end is through filtering energy storage capacitor C 1 ground connection; Afterflow inductance L 1 is connected with the positive electrical of LED50 with the tie point of said filtering energy storage capacitor C 1; Continuous current circuit unit 40 forms moment closed path loop when 20 couples of LED50 of dimming control unit carry out the light modulation operation and between LED50 and the ground.
The operation principle of this LED light modulation drive circuit:
When brightness adjustment control chip U1 scans mains switch K1 when pressing; Brightness adjustment control chip U1 just samples to the A/D value of PB0; PB3 output corresponding PWM modulating wave in sampling back makes LED work, again the A/D value of PB4 is carried out current sample; Brightness adjustment control chip U1 compares the A/D value of PB0 and PB4, adjusts the PWM output pulse width of PB3 after comparing again; And then get into the second rotation photophase; Also be that elder generation samples to the A/D value of the PB0 of brightness adjustment control chip U1; The A/D value of PB4 is sampled, brightness adjustment control chip U1 compares the A/D value of PB0 and PB4 again, adjusts the PWM output pulse width of PB3 after comparing again; So circulation, thus reach the light modulation purpose.
When realizing if desired regulating the brightness of LED continuously, then can be through regulating light adjusting potentiometer W1, with the A/D value of the PB0 that changes brightness adjustment control chip U1.
Above-mentioned each take turns in the momentary intervals of light modulation; The continuous current circuit unit then can form an electric current continuous current circuit; To guarantee that LED is in the light state, its current circuit direction is: afterflow inductance L 1-filtering energy storage capacitor C 1-LED-current sampling resistor R4-ground-sustained diode 1-afterflow inductance L 1.
Should be understood that above-mentioned statement to preferred embodiment of the present invention is comparatively detailed, can not therefore think the restriction to scope of patent protection of the present invention, scope of patent protection of the present invention should be as the criterion with accompanying claims.
Claims (6)
1. LED light modulation drive circuit, this circuit comprises dimming control unit, light modulation output unit and continuous current circuit unit; Said dimming control unit is electrically connected between power supply and the said light modulation output unit, is used to export pwm pulse, and this pwm pulse is realized the LED light modulation through said light modulation output unit and via the brightness of said continuous current circuit unit controls LED; It is characterized in that said light modulation output unit comprises the first current-limiting resistance R6, drives triode Q2, the second current-limiting resistance R5, switch triode Q1 and the 3rd divider resistance R3; The base stage of said driving triode Q2 is electrically connected with said dimming control unit through the first current-limiting resistance R6; The grounded emitter of said driving triode Q2; The collector electrode of said driving triode Q2 is electrically connected with the base stage of said switch triode Q1 through the said second current-limiting resistance R5; The emitter of said switch triode Q1 and collector electrode are connected in series on the cathode circuit of power supply, and collector electrode is electrically connected with said continuous current circuit unit; Said the 3rd divider resistance R3 is connected electrically between the emitter and base stage of said switch triode Q1.
2. LED light modulation drive circuit according to claim 1; It is characterized in that said dimming control unit comprises brightness adjustment control chip U1, the first divider resistance R1, the second divider resistance R2, mains switch K1, light adjusting potentiometer W1 and current sampling resistor R4; The operating voltage pin VCC of said brightness adjustment control chip U1 is connected with the positive electrical of power supply; The end of said mains switch K1 is connected with the positive electrical of power supply through the said first divider resistance R1; The other end is connected with the negative pole of said power supply, and said mains switch K1 is electrically connected with the power supply input pin PB1 of said brightness adjustment control chip U1 with the electric connection point of the said first divider resistance R1; The end of said light adjusting potentiometer W1 is connected with the positive electrical of power supply through the said second divider resistance R2; The other end is connected with the negative pole of said power supply, and the centre tap of said light adjusting potentiometer W1 is electrically connected with the brightness adjustment control pin PB0 of said brightness adjustment control chip U1; The feedback pin PB4 of said brightness adjustment control chip U1 is connected with the negative electricity of power supply through current sampling resistor R4; The light modulation output pin PB3 of said brightness adjustment control chip U1 is electrically connected with the first current-limiting resistance R6 of said light modulation output unit.
3. LED light modulation drive circuit according to claim 2 is characterized in that the model of said brightness adjustment control chip U1 is TINY13V.
4. LED light modulation drive circuit according to claim 1 is characterized in that this circuit also comprises the continuous current circuit unit, and this continuous current circuit unit comprises sustained diode 1, afterflow inductance L 1, filtering energy storage capacitor C 1; The plus earth of said sustained diode 1, negative pole is connected with the positive electrical of power supply; Said afterflow inductance L 1 is connected on the positive pole of power supply, and an end is connected with the negative electricity of said sustained diode 1, and the other end is through said filtering energy storage capacitor C 1 ground connection; Said afterflow inductance L 1 is connected with the positive electrical of said LED with the tie point of said filtering energy storage capacitor C 1.
5. LED light modulation drive circuit according to claim 1 is characterized in that, the model of said driving triode Q2 is the NPN type triode of T617.
6. LED light modulation drive circuit according to claim 1 is characterized in that said switch triode Q1 is the positive-negative-positive triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110046588.0A CN102651930B (en) | 2011-02-25 | 2011-02-25 | LED (Light-Emitting Diode) dimming drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110046588.0A CN102651930B (en) | 2011-02-25 | 2011-02-25 | LED (Light-Emitting Diode) dimming drive circuit |
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| CN102651930A true CN102651930A (en) | 2012-08-29 |
| CN102651930B CN102651930B (en) | 2014-11-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201110046588.0A Expired - Fee Related CN102651930B (en) | 2011-02-25 | 2011-02-25 | LED (Light-Emitting Diode) dimming drive circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103841714A (en) * | 2012-11-27 | 2014-06-04 | 深圳市海洋王照明工程有限公司 | LED dimming drive circuit |
| CN111526630A (en) * | 2019-11-25 | 2020-08-11 | 深圳市海洋王照明工程有限公司 | Drive control circuit and lamp |
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| CN201667742U (en) * | 2010-01-22 | 2010-12-08 | 青岛海信电器股份有限公司 | LED backlight driving device of light emitting diode and liquid crystal display |
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| JP2010212103A (en) * | 2009-03-11 | 2010-09-24 | Shindengen Electric Mfg Co Ltd | Sounding prevention circuit, and lighting system |
| CN201611025U (en) * | 2009-08-20 | 2010-10-20 | 杭州佑国光电科技有限公司 | LED lamp with adjustable light |
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| CN103841714A (en) * | 2012-11-27 | 2014-06-04 | 深圳市海洋王照明工程有限公司 | LED dimming drive circuit |
| CN103841714B (en) * | 2012-11-27 | 2016-01-13 | 深圳市海洋王照明工程有限公司 | LED dimming driving circuit |
| CN111526630A (en) * | 2019-11-25 | 2020-08-11 | 深圳市海洋王照明工程有限公司 | Drive control circuit and lamp |
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| Publication number | Publication date |
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| CN102651930B (en) | 2014-11-19 |
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Granted publication date: 20141119 Termination date: 20190225 |