CN101720147A - LED driving circuit and LED device - Google Patents
LED driving circuit and LED device Download PDFInfo
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- CN101720147A CN101720147A CN200910109007A CN200910109007A CN101720147A CN 101720147 A CN101720147 A CN 101720147A CN 200910109007 A CN200910109007 A CN 200910109007A CN 200910109007 A CN200910109007 A CN 200910109007A CN 101720147 A CN101720147 A CN 101720147A
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Abstract
The invention is applicable to the field of LEDs, and provides an LED driving circuit and an LED device. The LED driving circuit comprises a power module, a control module, a switch module, a first constant current module, a first voltage-dividing resistor and a second voltage-dividing resistor, wherein the detecting end of the control module is connected to the serial connecting end of the first voltage-dividing resistor and the second voltage-dividing resistor; whether an LED lamp has a short circuit or not is judged according to the detected negative voltage of the LED lamp by the control module; and when the LED lamp has the short circuit, the control module outputs a pulse control signal and controls the turn-off of the switch module so as to cut off the loop of the LED lamp to realize short circuit protection. In the LED driving circuit provided by the invention, the negative voltage of the LED lamp is detected by the control module; the short circuit of the LED lamp can be judged by comparing the negative voltage of the LED lamp with a preset threshold value; and when the LED lamp has the short circuit, the output end of the control module outputs the pulse control signal and controls the turn-off of the switch module so as to cut off the loop of the LED lamp to realize the short circuit protection, and components are prevented from being burned out when the LED lamp has the short circuit.
Description
Technical field
The invention belongs to the LED field, relate in particular to a kind of led drive circuit and LED matrix.
Background technology
Existing led drive circuit does not have short-circuit protection function, and when the short circuit of LED lamp, led drive circuit does not have protective effect, can cause the constant flow element heating until burning out.
Summary of the invention
The purpose of the embodiment of the invention is to provide a kind of led drive circuit, is intended to solve the problem that existing led drive circuit does not have short-circuit protection function can cause components and parts to be burnt out.
The embodiment of the invention is achieved in that a kind of led drive circuit, and described led drive circuit comprises: power module, control module, switch module, first constant flow module, first divider resistance and second divider resistance; The input of described first constant flow module is connected to the output of described power module, the output of described first constant flow module is connected to the negative pole of LED lamp, the positive pole of described LED lamp is connected to the output of described power module, and the ground end of described first constant flow module is connected to an end of described switch module; The other end ground connection of described switch module, the control end of described switch module is connected to the output of described control module; Described first divider resistance and described second divider resistance are contacted between the ground end of the output that is connected described first constant flow module and described first constant flow module successively; The power end of described control module is connected to the output of described power module; The test side of described control module is connected to the end that is connected in series of described first divider resistance and described second divider resistance; Judge the whether short circuit of described LED lamp by the cathode voltage of the detected described LED lamp in the test side of described control module; when described LED lamp short circuit, thus the output of described control module output pulse control signal and control described switch module and turn-off the loop that cuts off the LED lamp and realize short-circuit protection.
Wherein, described control module further comprises: single-chip microcomputer and be connected in series in the power output end of described single-chip microcomputer and first sampling resistor and second sampling resistor between the ground end successively; The power end of described single-chip microcomputer is connected to the output of described power module, the sampling end of described single-chip microcomputer is connected to the end that is connected in series of described first sampling resistor and described second sampling resistor, the test side of single-chip microcomputer connects the end that is connected in series of first divider resistance and second divider resistance, and the output of described single-chip microcomputer is connected to the control end of described switch module.
Wherein, described control module further comprises: touch-switch and pull-up resistor; One end of described touch-switch is connected to the output of described power module by described pull-up resistor, and an end of described touch-switch also is connected to the control end of described single-chip microcomputer; The other end ground connection of described touch-switch.
Wherein, switch module further comprises: switch element and current-limiting resistance; One end of described switch element is connected to the ground end of described first constant flow module, the other end ground connection of described switch element, and the control end of described switch element is connected to the output of described control module by described current-limiting resistance.
Wherein, described switch element is a triode, and the base stage of described triode is connected to the output of described control module by described current-limiting resistance, and the collector electrode of described triode is connected to the ground end of described first constant flow module, the grounded emitter of described triode.
Wherein, described led drive circuit also comprises: second constant flow module that is connected in parallel with described first constant flow module; The input of described second constant flow module is connected to the output of described power module, and the output of described second constant flow module is connected to the negative pole of described LED lamp, and the ground end of described second constant flow module is connected to an end of described switch module.
Wherein, described power module further comprises: battery and the filter capacitor C1 and the filter capacitor C2 that are connected in parallel to the two ends of described battery.
Wherein, described battery is the 3.7V lithium battery.
Another purpose of the embodiment of the invention is to provide a kind of LED matrix, and it comprises LED lamp and the led drive circuit that is used to drive the work of described LED lamp, the led drive circuit that described led drive circuit is above-mentioned.
The led drive circuit that the embodiment of the invention provides adopts control module to detect the cathode voltage of LED lamp; thereby, the cathode voltage of LED lamp and preset threshold judge the whether short circuit of LED lamp by being compared; when the short circuit of LED lamp; the output output pulse control signal and the control switch module shuts down of control module; thereby short-circuit protection is realized in the loop that cuts off the LED lamp, and components and parts are burnt out when having avoided the short circuit of LED lamp.
Description of drawings
Fig. 1 is the circuit diagram of the led drive circuit that provides of the embodiment of the invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.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.
The led drive circuit that the embodiment of the invention provides adopts control module to detect the cathode voltage of LED lamp; thereby, the cathode voltage of LED lamp and preset threshold judge the whether short circuit of LED lamp by being compared; when the short circuit of LED lamp; the output output pulse control signal and the control switch module shuts down of control module; thereby short-circuit protection is realized in the loop that cuts off the LED lamp, and components and parts are burnt out when having avoided the short circuit of LED lamp.
The led drive circuit that the embodiment of the invention provides is mainly used in driving LED lamp work in the LED matrix.Fig. 1 shows the circuit diagram of the led drive circuit that the embodiment of the invention provides, and for convenience of explanation, only shows the part relevant with the embodiment of the invention, and details are as follows.
Led drive circuit comprises: power module 1, control module 2, switch module 3, first constant flow module 4, the first divider resistance R5 and the second divider resistance R6; Wherein, the input Vdd of first constant flow module 4 is connected to the output of power module 1, the output OUT of first constant flow module 4 is connected to the negative pole of LED lamp 6, and the positive pole of LED lamp 6 is connected to the output of power module 1, and the ground end GND of first constant flow module 4 is connected to an end of switch module 3; The other end ground connection of switch module 3, the control end of switch module 3 is connected to the output of control module 2; The first divider resistance R5 and the second divider resistance R6 contact between the ground end GND of the output OUT that is connected first constant flow module 4 and first constant flow module 4 successively; The power end of control module 2 is connected to the output of power module 1; The test side of control module 2 is connected to the end that is connected in series of the first divider resistance R5 and the second divider resistance R6; Judge whether short circuit of LED lamp 6 by the cathode voltage of the detected LED lamp 6 in the test side of control module 2; when 6 short circuits of LED lamp, thereby the output of control module 2 output pulse control signal and control switch module 3 are turn-offed the loop realization short-circuit protection that cuts off LED lamp 6.
In embodiments of the present invention, power module 1 further comprises: battery and the filter capacitor C1 and the filter capacitor C2 that are connected in parallel to the two ends of battery.Wherein, can to adopt voltage be the lithium battery of 3.7V to battery.
In embodiments of the present invention, control module 2 further comprises: single-chip microcomputer 21 and be connected in series in the power output end PB3 of single-chip microcomputer 21 and the first sampling resistor R1 and the second sampling resistor R2 between the ground end GND successively; Wherein, the power end VCC of single-chip microcomputer 21 is connected to the output of power module 1, the sampling end PB4 of single-chip microcomputer 21 is connected to the end that is connected in series of the first sampling resistor R1 and the second sampling resistor R2, and the test side PB2 of single-chip microcomputer 21 connects the end that is connected in series of the first divider resistance R5 and the second divider resistance R6; The output PB1 of single-chip microcomputer 21 is connected to the control end of switch module 3.Wherein, the ground end GND ground connection of single-chip microcomputer 21, the RESET end of single-chip microcomputer 21 is unsettled not to be connect.
As one embodiment of the present of invention, control module 2 further comprises: touch-switch SW and pull-up resistor R3; Wherein, the end of touch-switch SW is connected to the output of power module 1 by pull-up resistor R3, and the end of touch-switch SW also is connected to the control end PB0 of single-chip microcomputer 21; The other end ground connection of touch-switch SW.
As one embodiment of the present of invention, control module 2 also comprises capacitor C 3 and capacitor C 4, and wherein capacitor C 3 is connected between the power output end PB3 and ground end GND of single-chip microcomputer 21; Capacitor C 4 is connected between the control end PB0 and ground of single-chip microcomputer 21.
In embodiments of the present invention, switch module 3 further comprises: switch element and current-limiting resistance R4; Wherein, an end of switch element is connected to the ground end GND of first constant flow module 4, the other end ground connection of switch element, and the control end of switch element is connected to the output of control module 2 by current-limiting resistance R4.
Wherein, switch element can be the switch element of switching tube, metal-oxide-semiconductor, transistor or any on-off action.Adopt the triode Q1 that cost is low, cost performance is high in the embodiment of the invention, the base stage of triode Q1 is connected to the output of control module 2 by current-limiting resistance R4, the collector electrode of triode Q1 is connected to the ground end GND of first constant flow module, the grounded emitter of triode Q1.
In embodiments of the present invention, led drive circuit also comprises: second constant flow module 5 that is connected in parallel with first constant flow module 4; Wherein, the input Vdd of second constant flow module 5 is connected to the output of power module 1, and the output of second constant flow module 5 is connected to the negative pole of LED lamp 6, and the ground end of second constant flow module 5 is connected to an end of switch module 3.In led drive circuit, adopt this second constant flow module 5 that is connected in parallel with first constant flow module 4 can drive high-power LED lamp.
The operation principle of the led drive circuit that the embodiment of the invention provides now is described in detail in detail in conjunction with Fig. 1: first constant flow module 4 is constant current device, first constant flow module 4 has determined to flow through the maximum current of LED lamp 6, the pulse control signal of single-chip microcomputer 21 output certain frequencies and duty ratio is controlled the ON time of triode Q1, just can adjust the electric current that flows through LED lamp 6 by adjusting duty ratio, the conducting that single-chip microcomputer 21 can determine triode Q1 according on off state whether.Deliver to the test side PB2 of single-chip microcomputer 21 after the first divider resistance R5 and the second divider resistance R6 the negative pole voltage dividing potential drop (pressure drop on the triode Q1 can be ignored) over the ground with LED lamp 6, can detect the voltage of the negative pole of LED lamp 6 by the AD translation function of single-chip microcomputer 21, when LED lamp 6 operate as normal, the cathode voltage of LED lamp 6 is lower, less than 2V (cell voltage 3.7V); When 6 short circuits of LED lamp; the cathode voltage of LED lamp 6 has just approximated cell voltage; therefore can by the negative battery voltage of detection LED lamp 6 and with preset threshold (battery voltage value) thus compare and judge whether short circuit of LED lamp 6; when 6 short circuits of LED lamp; single-chip microcomputer 21 output pulse control signals are also controlled triode Q1 and are turn-offed; such first constant flow module 4 also just has been in off state; thereby short-circuit protection has been realized in the loop that has cut off LED lamp 6, and components and parts are burnt out when having avoided 6 short circuits of LED lamp.Like this can be so that under LED lamp 6 short-circuit conditions, led drive circuit still meets relevant safety standard.
The led drive circuit that the embodiment of the invention provides adopts control module to detect the cathode voltage of LED lamp; thereby, the cathode voltage of LED lamp and preset threshold judge the whether short circuit of LED lamp by being compared; when the short circuit of LED lamp; the output output pulse control signal and the control switch module shuts down of control module; thereby short-circuit protection is realized in the loop that cuts off the LED lamp, and components and parts are burnt out when having avoided the short circuit of LED lamp.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. a led drive circuit is characterized in that, described led drive circuit comprises:
Power module, control module, switch module, first constant flow module, first divider resistance and second divider resistance;
The input of described first constant flow module is connected to the output of described power module, the output of described first constant flow module is connected to the negative pole of LED lamp, the positive pole of described LED lamp is connected to the output of described power module, and the ground end of described first constant flow module is connected to an end of described switch module;
The other end ground connection of described switch module, the control end of described switch module is connected to the output of described control module;
Described first divider resistance and described second divider resistance are contacted between the ground end of the output that is connected described first constant flow module and described first constant flow module successively;
The power end of described control module is connected to the output of described power module; The test side of described control module is connected to the end that is connected in series of described first divider resistance and described second divider resistance;
Judge the whether short circuit of described LED lamp by the cathode voltage of the detected described LED lamp in the test side of described control module; when described LED lamp short circuit, thus the output of described control module output pulse control signal and control described switch module and turn-off the loop that cuts off the LED lamp and realize short-circuit protection.
2. led drive circuit as claimed in claim 1 is characterized in that, described control module further comprises:
Single-chip microcomputer and be connected in series in the power output end of described single-chip microcomputer and first sampling resistor and second sampling resistor between the ground end successively;
The power end of described single-chip microcomputer is connected to the output of described power module, the sampling end of described single-chip microcomputer is connected to the end that is connected in series of described first sampling resistor and described second sampling resistor, the test side of single-chip microcomputer connects the end that is connected in series of first divider resistance and second divider resistance, and the output of described single-chip microcomputer is connected to the control end of described switch module.
3. led drive circuit as claimed in claim 2 is characterized in that, described control module further comprises:
Touch-switch and pull-up resistor;
One end of described touch-switch is connected to the output of described power module by described pull-up resistor, and an end of described touch-switch also is connected to the control end of described single-chip microcomputer; The other end ground connection of described touch-switch.
4. led drive circuit as claimed in claim 1 is characterized in that switch module further comprises:
Switch element and current-limiting resistance;
One end of described switch element is connected to the ground end of described first constant flow module, the other end ground connection of described switch element, and the control end of described switch element is connected to the output of described control module by described current-limiting resistance.
5. led drive circuit as claimed in claim 4, it is characterized in that, described switch element is a triode, the base stage of described triode is connected to the output of described control module by described current-limiting resistance, the collector electrode of described triode is connected to the ground end of described first constant flow module, the grounded emitter of described triode.
6. led drive circuit as claimed in claim 1 is characterized in that, described led drive circuit also comprises:
Second constant flow module that is connected in parallel with described first constant flow module;
The input of described second constant flow module is connected to the output of described power module, and the output of described second constant flow module is connected to the negative pole of described LED lamp, and the ground end of described second constant flow module is connected to an end of described switch module.
7. led drive circuit as claimed in claim 1 is characterized in that, described power module further comprises:
Battery and the filter capacitor C1 and the filter capacitor C2 that are connected in parallel to the two ends of described battery.
8. led drive circuit as claimed in claim 7 is characterized in that, described battery is the 3.7V lithium battery.
9. LED matrix, it comprises LED lamp and the led drive circuit that is used to drive the work of described LED lamp, it is characterized in that, described led drive circuit is each described led drive circuit of claim 1-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101090076A CN101720147B (en) | 2009-07-21 | 2009-07-21 | LED driving circuit and LED device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101090076A CN101720147B (en) | 2009-07-21 | 2009-07-21 | LED driving circuit and LED device |
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| Publication Number | Publication Date |
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| CN101720147A true CN101720147A (en) | 2010-06-02 |
| CN101720147B CN101720147B (en) | 2013-04-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009101090076A Active CN101720147B (en) | 2009-07-21 | 2009-07-21 | LED driving circuit and LED device |
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| CN102695320A (en) * | 2011-03-24 | 2012-09-26 | 海洋王照明科技股份有限公司 | Constant current drive circuit |
| CN102843804A (en) * | 2011-06-20 | 2012-12-26 | 海洋王照明科技股份有限公司 | Touch control circuit and electric torch |
| CN103369766A (en) * | 2012-03-30 | 2013-10-23 | 海洋王照明科技股份有限公司 | A head lamp and a lighting circuit capable of sensing ambient illumination |
| CN103517498A (en) * | 2012-06-26 | 2014-01-15 | 海洋王照明科技股份有限公司 | Intelligent temperature-controlled light-modulation control circuit of LED electric torch |
| WO2014187018A1 (en) * | 2013-05-24 | 2014-11-27 | 深圳市华星光电技术有限公司 | Short circuit protection circuit and electronic device having same |
| CN106034369A (en) * | 2015-03-10 | 2016-10-19 | 赛尔富电子有限公司 | LED power supply with short-circuit protection circuit |
| CN106163046A (en) * | 2015-04-28 | 2016-11-23 | 赛尔富电子有限公司 | A kind of LED power with short-circuit protection |
| CN112526399A (en) * | 2019-08-30 | 2021-03-19 | 神讯电脑(昆山)有限公司 | LED lamp electric cable testing circuit and method thereof |
| CN112731109A (en) * | 2020-12-29 | 2021-04-30 | 深圳市天视通视觉有限公司 | Drive test circuit |
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| CN100569038C (en) * | 2005-06-27 | 2009-12-09 | 深圳市中电照明股份有限公司 | A kind of LED load protector line |
| WO2008050679A1 (en) * | 2006-10-25 | 2008-05-02 | Panasonic Electric Works Co., Ltd. | Led lighting circuit and illuminating apparatus using the same |
| CN101316467B (en) * | 2008-02-21 | 2013-09-25 | 上海铁路局科学技术研究所 | Duplexed LED point type light source colour lamp signal machine control circuit |
| CN101345405B (en) * | 2008-05-06 | 2010-12-15 | 合肥同智机电控制技术股份有限公司 | Protection circuit of power switch device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102695320A (en) * | 2011-03-24 | 2012-09-26 | 海洋王照明科技股份有限公司 | Constant current drive circuit |
| CN102695320B (en) * | 2011-03-24 | 2015-11-11 | 海洋王照明科技股份有限公司 | Constant-current drive circuit |
| CN102843804A (en) * | 2011-06-20 | 2012-12-26 | 海洋王照明科技股份有限公司 | Touch control circuit and electric torch |
| CN103369766A (en) * | 2012-03-30 | 2013-10-23 | 海洋王照明科技股份有限公司 | A head lamp and a lighting circuit capable of sensing ambient illumination |
| CN103517498A (en) * | 2012-06-26 | 2014-01-15 | 海洋王照明科技股份有限公司 | Intelligent temperature-controlled light-modulation control circuit of LED electric torch |
| WO2014187018A1 (en) * | 2013-05-24 | 2014-11-27 | 深圳市华星光电技术有限公司 | Short circuit protection circuit and electronic device having same |
| CN106034369A (en) * | 2015-03-10 | 2016-10-19 | 赛尔富电子有限公司 | LED power supply with short-circuit protection circuit |
| CN106034369B (en) * | 2015-03-10 | 2018-08-31 | 赛尔富电子有限公司 | A kind of LED power with short-circuit protection circuit |
| CN106163046A (en) * | 2015-04-28 | 2016-11-23 | 赛尔富电子有限公司 | A kind of LED power with short-circuit protection |
| CN106163046B (en) * | 2015-04-28 | 2018-12-28 | 赛尔富电子有限公司 | A kind of LED power with short-circuit protection |
| CN112526399A (en) * | 2019-08-30 | 2021-03-19 | 神讯电脑(昆山)有限公司 | LED lamp electric cable testing circuit and method thereof |
| CN112731109A (en) * | 2020-12-29 | 2021-04-30 | 深圳市天视通视觉有限公司 | Drive test circuit |
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