CN102711310A - Light-emitting diode (LED) drive circuit and lamp - Google Patents
Light-emitting diode (LED) drive circuit and lamp Download PDFInfo
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- CN102711310A CN102711310A CN2011100754397A CN201110075439A CN102711310A CN 102711310 A CN102711310 A CN 102711310A CN 2011100754397 A CN2011100754397 A CN 2011100754397A CN 201110075439 A CN201110075439 A CN 201110075439A CN 102711310 A CN102711310 A CN 102711310A
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Abstract
The invention is applicable to the field of lamps and provides a light-emitting diode (LED) drive circuit and a lamp. The LED drive circuit comprises a switch control unit, a boost unit, a voltage detection unit and a control unit. According to the embodiment of the invention, the voltage detection unit detects supply voltage of the LED lamp and feeds back a voltage value to the control unit; and the control unit judges whether the supply voltage drops to below a normalized value, and if so, the control unit controls a switch control unit to control a battery BT1 to supply power to the LED lamp, and increases the flicker frequency of the LED lamp or cuts off the power of the LED lamp to prompt a user to repair the LED lamp. Therefore, damage to the LED lamp can be avoided, and the service life of the LED lamp is prolonged.
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.
Along with the development of microelectric technique, battery powered LED light fixture has appearred utilizing at present, and when the supply power voltage to the LED lamp is reduced to standard value when following, LED lamp also long-term work meeting causes the LED lamp to damage, and can reduce the life-span of LED light fixture like this.
Summary of the invention
Main purpose of the present invention is to provide a kind of led drive circuit, is intended to solve the existing problem of utilizing battery powered LED light fixture when the supply power voltage of LED lamp reduces, to have the life-span weak point.
The present invention is achieved in that a kind of led drive circuit, is connected with the LED lamp with battery BT1 respectively, and said led drive circuit comprises:
Said battery BT1 is anodal for the input termination, controls the switch control unit of said battery BT1 to LED lamp power supply break-make;
The output of the said switch control unit of input termination, the anodal boosting unit of the said LED lamp of output termination;
Be connected with said LED lamp negative pole, detect the voltage detection unit of the supply power voltage of said LED lamp; And
Control unit; It detects the said voltage detection unit of termination, the control end of the said switch control unit of the first output termination, the control end of the said boosting unit of the second output termination; Be used to judge whether the supply power voltage of said LED lamp is reduced to below the standard value; If, control the break-make of said switch control unit regulating cell BT1 to the power supply of LED lamp, increase the flicker frequency of said LED lamp or said LED lamp is extinguished;
Wherein, Said switch control unit comprises N type metal-oxide-semiconductor Q5, NPN type triode Q6, divider resistance R2, divider resistance R3 and divider resistance R4; The drain electrode of said N type metal-oxide-semiconductor Q5 is that the said battery BT1 of the input termination of switch control unit is anodal; The source electrode of said N type metal-oxide-semiconductor Q5 is the input of the said boosting unit of output termination of switch control unit, and said divider resistance R4 is connected between the drain and gate of said N type metal-oxide-semiconductor Q5, and the collector electrode of said NPN type triode Q6 connects the grid of said N type metal-oxide-semiconductor Q5; The grounded emitter of said NPN type triode Q6; The base stage of said NPN type triode Q6 connects first end of divider resistance R3, and second end of said divider resistance R3 is the control end of switch control unit, and said divider resistance R2 is connected between the base stage and ground of NPN type triode Q6.
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, voltage detection unit detects the supply power voltage of LED lamp, and feeds back to control unit; Control unit judges whether the supply power voltage of LED lamp is reduced to below the standard value, if control unit control switch control unit regulating cell BT1 is to the break-make of LED lamp power supply; Increase the flicker frequency of LED lamp or the LED lamp is extinguished; The prompting user keeps in repair the LED light fixture, thereby avoids the LED lamp to be damaged, and has prolonged the life-span of LED light fixture.
Description of drawings
Fig. 1 is the module map of the led drive circuit that provides of the embodiment of the invention;
Fig. 2 is the exemplary circuit figure of the led drive circuit that provides of 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 battery BT1 respectively, and led drive circuit comprises switch control unit 100, boosting unit 200, voltage detection unit 300 and control unit 400.
The input termination battery BT1 of switch control unit 100 is anodal, and control battery BT1 is to LED lamp power supply break-make;
The output of the input termination switch control unit 100 of boosting unit 200, output termination LED lamp is anodal;
Wherein, Switch control unit 100 comprises N type metal-oxide-semiconductor Q5, NPN type triode Q6, divider resistance R2, divider resistance R3 and divider resistance R4; The drain electrode of N type metal-oxide-semiconductor Q5 is that the input termination battery BT1 of switch control unit 100 is anodal; The source electrode of N type metal-oxide-semiconductor Q5 is the input of the output termination boosting unit 200 of switch control unit 100, and divider resistance R4 is connected between the drain and gate of N type metal-oxide-semiconductor Q5, and the collector electrode of NPN type triode Q6 connects the grid of N type metal-oxide-semiconductor Q5; The grounded emitter of NPN type triode Q6; The base stage of NPN type triode Q6 connects first end of divider resistance R3, and second end of divider resistance R3 is the control end of switch control unit 100, and divider resistance R2 is connected between the base stage and ground of NPN type triode Q6.
As one embodiment of the invention, led drive circuit also comprises Overvoltage protecting unit 500, and the input termination LED lamp of Overvoltage protecting unit 500 is anodal, the control end of the output termination boosting unit 200 of Overvoltage protecting unit 500.
Fig. 2 shows the exemplary circuit 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, boosting unit 200 comprises:
Inductance L 1, N type metal-oxide-semiconductor Q4, NPN type triode Q1 and positive-negative-positive triode Q2;
First end of inductance L 1 is the input of boosting unit 200; The collector electrode of NPN type triode Q1 connects first end of inductance L 1; The base stage of NPN type triode Q1 connects the base stage of positive-negative-positive triode Q2, and the base stage of positive-negative-positive triode Q2 is the control end of boosting unit 200, and the emitter of NPN type triode Q1 connects the emitter of positive-negative-positive triode Q2 and the grid of N type metal-oxide-semiconductor Q4 simultaneously; The grounded collector of positive-negative-positive triode Q2; The source ground of N type metal-oxide-semiconductor Q4, the drain electrode of N type metal-oxide-semiconductor Q4 connects second end of inductance L 1, and second end of inductance L 1 is the output of boosting unit 200.
As one embodiment of the invention, voltage detection 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 voltage detection 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 voltage detection unit 300.
As one embodiment of the invention, Overvoltage protecting unit 500 comprises:
Breakdown diode D2, divider resistance R5, divider resistance R7 and NPN type triode Q3;
The negative pole of breakdown diode D2 connects the positive pole of LED lamp; The positive pole of breakdown diode D2 connects first end of divider resistance R5; The base stage of the second termination NPN type triode Q3 of divider resistance R5; The grounded emitter of NPN type triode Q3, divider resistance R7 is connected between the base stage and emitter of NPN type triode Q3, and the current collection of NPN type triode Q3 is the output of Overvoltage protecting unit 500 very.
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 400, and another road of second end of switch SW 1 connects the positive pole of battery BT1 through divider resistance R10.
As one embodiment of the invention, led drive circuit also comprises diode D1, and diode D1 is connected between the drain electrode of power supply and N type metal-oxide-semiconductor Q5, is used to prevent the power supply reversal connection.
It is anodal that the power end VDD of control unit 400 meets battery BT1, and as one embodiment of the invention, it is the single-chip microcomputer of HT66F03C that control unit 400 adopts model.
The operation principle of led drive circuit is:
The drain electrode of N type metal-oxide-semiconductor Q5 connects the positive pole of battery BT1; The grid of N type metal-oxide-semiconductor Q5 meets the first output OUT1 of control unit 400 through NPN type triode Q6 and divider resistance R3; N type metal-oxide-semiconductor Q5 conducting and disconnection under the control of control unit 400; The break-make of control LED lamp current supply circuit; The boosting unit 200 that is made up of inductance L 1, N type metal-oxide-semiconductor Q4, NPN type triode Q1 and positive-negative-positive triode Q2 meets the second output OUT2 of control unit 400 through resistance R 6, and boosting unit 200 is elevated to set point with the voltage of the source electrode output of N type metal-oxide-semiconductor Q5 under the control of the pwm pulse signal of control unit 400 outputs.When the anodal overtension of LED lamp, breakdown diode D2 is breakdown, and NPN type triode Q3 base voltage is a high level; NPN type triode Q3 conducting; The base earth of NPN type triode Q1 and positive-negative-positive triode Q2, boosting unit 200 quits work, thus protection LED lamp.
The test side FB of control unit 400 detects the supply power voltage of LED lamp through voltage detection unit 300; Be used to judge whether the supply power voltage of LED lamp is reduced to below the standard value, if control switch control unit 100 regulating cell BT1 are to the break-make of LED lamp power supply; Increase the flicker frequency of LED lamp or the LED lamp is extinguished; The prompting user keeps in repair the LED light fixture, thereby avoids the LED lamp to be damaged, and has prolonged the life-span of LED light fixture.
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, voltage detection unit detects the supply power voltage of LED lamp, and feeds back to control unit; Control unit judges whether the supply power voltage of LED lamp is reduced to below the standard value, if control unit control switch control unit regulating cell BT1 is to the break-make of LED lamp power supply; Increase the flicker frequency of LED lamp or the LED lamp is extinguished; The prompting user keeps in repair the LED light fixture, thereby avoids the LED lamp to be damaged, and has prolonged the life-span of LED light fixture.
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 (7)
1. a led drive circuit is connected with the LED lamp with battery BT1 respectively, it is characterized in that said led drive circuit comprises:
Said battery BT1 is anodal for the input termination, controls the switch control unit of said battery BT1 to LED lamp power supply break-make;
The output of the said switch control unit of input termination, the anodal boosting unit of the said LED lamp of output termination;
Be connected with said LED lamp negative pole, detect the voltage detection unit of the supply power voltage of said LED lamp; And
Control unit; It detects the said voltage detection unit of termination, the control end of the said switch control unit of the first output termination, the control end of the said boosting unit of the second output termination; Be used to judge whether the supply power voltage of said LED lamp is reduced to below the standard value; If, control the break-make of said switch control unit regulating cell BT1 to the power supply of LED lamp, increase the flicker frequency of said LED lamp or said LED lamp is extinguished;
Wherein, Said switch control unit comprises N type metal-oxide-semiconductor Q5, NPN type triode Q6, divider resistance R2, divider resistance R3 and divider resistance R4; The drain electrode of said N type metal-oxide-semiconductor Q5 is that the said battery BT1 of the input termination of switch control unit is anodal; The source electrode of said N type metal-oxide-semiconductor Q5 is the input of the said boosting unit of output termination of switch control unit, and said divider resistance R4 is connected between the drain and gate of said N type metal-oxide-semiconductor Q5, and the collector electrode of said NPN type triode Q6 connects the grid of said N type metal-oxide-semiconductor Q5; The grounded emitter of said NPN type triode Q6; The base stage of said NPN type triode Q6 connects first end of divider resistance R3, and second end of said divider resistance R3 is the control end of switch control unit, and said divider resistance R2 is connected between the base stage and ground of NPN type triode Q6.
2. led drive circuit as claimed in claim 1; It is characterized in that; Said led drive circuit also comprises Overvoltage protecting unit, and the said LED lamp of the input termination of said Overvoltage protecting unit is anodal, the control end of the said boosting unit of output termination of said Overvoltage protecting unit.
3. led drive circuit as claimed in claim 1 is characterized in that, said boosting unit comprises:
Inductance L 1, N type metal-oxide-semiconductor Q4, NPN type triode Q1 and positive-negative-positive triode Q2;
First end of said inductance L 1 is the input of said boosting unit; The collector electrode of said NPN type triode Q1 connects first end of said inductance L 1; The base stage of said NPN type triode Q1 connects the base stage of positive-negative-positive triode Q2, and the base stage of said positive-negative-positive triode Q2 is the control end of boosting unit, and the emitter of said NPN type triode Q1 connects the emitter of positive-negative-positive triode Q2 and the grid of N type metal-oxide-semiconductor Q4 simultaneously; The grounded collector of said positive-negative-positive triode Q2; The source ground of said N type metal-oxide-semiconductor Q4, the drain electrode of said N type metal-oxide-semiconductor Q4 connects second end of inductance L 1, and second end of said inductance L 1 is the output of said boosting unit.
4. led drive circuit as claimed in claim 1 is characterized in that, said voltage detection 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 voltage detection 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 voltage detection unit.
5. led drive circuit as claimed in claim 2 is characterized in that, said Overvoltage protecting unit comprises:
Breakdown diode D2, divider resistance R5, divider resistance R7 and NPN type triode Q3;
The negative pole of said breakdown diode D2 connects the positive pole of LED lamp; The positive pole of said breakdown diode D2 connects first end of said divider resistance R5; The base stage of the said NPN type of second termination triode Q3 of said divider resistance R5; The grounded emitter of said NPN type triode Q3, said divider resistance R7 is connected between the base stage and emitter of said NPN type triode Q3, and the current collection of said NPN type triode Q3 is the output of Overvoltage protecting unit very.
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 the positive pole of said battery BT1 through divider resistance R10.
7. a light fixture comprises battery BT1 and LED lamp, it is characterized in that, said light fixture also comprises each described led drive circuit like claim 1-6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100754397A CN102711310A (en) | 2011-03-28 | 2011-03-28 | Light-emitting diode (LED) drive circuit and lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100754397A CN102711310A (en) | 2011-03-28 | 2011-03-28 | Light-emitting diode (LED) drive circuit and lamp |
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| CN102711310A true CN102711310A (en) | 2012-10-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011100754397A Pending CN102711310A (en) | 2011-03-28 | 2011-03-28 | Light-emitting diode (LED) drive circuit and lamp |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102970791A (en) * | 2012-11-01 | 2013-03-13 | 深圳创维－Rgb电子有限公司 | Light-emitting diode (LED) constant current driving circuit and LED lamp |
| CN104052260A (en) * | 2013-03-15 | 2014-09-17 | 海洋王（东莞）照明科技有限公司 | Boost control circuit |
| CN104411077A (en) * | 2014-12-25 | 2015-03-11 | 山东亿昌照明科技有限公司 | Led lamp flash protection module |
| CN104640267A (en) * | 2013-11-08 | 2015-05-20 | 苏州璨宇光学有限公司 | Light source driver and driving method thereof |
| CN107093926A (en) * | 2017-06-27 | 2017-08-25 | 合肥尚硕新能源有限公司 | It is a kind of to the solar powered dual power supply switching circuit aided in |
| CN110848605A (en) * | 2019-09-30 | 2020-02-28 | 广东自由之光照明实业有限公司 | LED underground lamp |
| CN110925698A (en) * | 2019-12-19 | 2020-03-27 | 海丰通航科技有限公司 | Slope indicator and flash control method thereof |
| CN111741570A (en) * | 2020-07-24 | 2020-10-02 | 武汉精立电子技术有限公司 | Voltage adaptive constant current circuit and calibration device and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102970791A (en) * | 2012-11-01 | 2013-03-13 | 深圳创维－Rgb电子有限公司 | Light-emitting diode (LED) constant current driving circuit and LED lamp |
| CN102970791B (en) * | 2012-11-01 | 2014-12-10 | 深圳创维－Rgb电子有限公司 | Light-emitting diode (LED) constant current driving circuit and LED lamp |
| CN104052260A (en) * | 2013-03-15 | 2014-09-17 | 海洋王（东莞）照明科技有限公司 | Boost control circuit |
| CN104640267A (en) * | 2013-11-08 | 2015-05-20 | 苏州璨宇光学有限公司 | Light source driver and driving method thereof |
| CN104411077A (en) * | 2014-12-25 | 2015-03-11 | 山东亿昌照明科技有限公司 | Led lamp flash protection module |
| CN104411077B (en) * | 2014-12-25 | 2016-11-30 | 山东亿昌照明科技有限公司 | LED dodges protection module |
| CN107093926A (en) * | 2017-06-27 | 2017-08-25 | 合肥尚硕新能源有限公司 | It is a kind of to the solar powered dual power supply switching circuit aided in |
| CN110848605A (en) * | 2019-09-30 | 2020-02-28 | 广东自由之光照明实业有限公司 | LED underground lamp |
| CN110925698A (en) * | 2019-12-19 | 2020-03-27 | 海丰通航科技有限公司 | Slope indicator and flash control method thereof |
| CN110925698B (en) * | 2019-12-19 | 2023-12-12 | 海丰通航科技有限公司 | Gradient indicator and flash control method thereof |
| CN111741570A (en) * | 2020-07-24 | 2020-10-02 | 武汉精立电子技术有限公司 | Voltage adaptive constant current circuit and calibration device and method |
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Application publication date: 20121003 |