CN101778510A - LED signal indicator light and multipath LED drive circuits thereof - Google Patents
LED signal indicator light and multipath LED drive circuits thereof Download PDFInfo
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- CN101778510A CN101778510A CN201010044439A CN201010044439A CN101778510A CN 101778510 A CN101778510 A CN 101778510A CN 201010044439 A CN201010044439 A CN 201010044439A CN 201010044439 A CN201010044439 A CN 201010044439A CN 101778510 A CN101778510 A CN 101778510A
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- pwm pulse
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The invention relates to an LED signal indicator light and multipath LED drive circuits thereof. The multipath LED drive circuits comprise a PWM pulse generating unit for generating PWM pulse signal, and a switching tube unit; the switching tube unit comprises a plurality of switching tubes with identical parameters, each path LED is connected with a switching tube in series, the control ends of the switching tubes are connected with the one path PWM pulse signal output end generated by the PWM pulse generating unit simultaneously. In the implantation of the technical scheme of the invention, the PWM pulse generating unit generates a pulse signal, the pulse signal controls the connection and disconnection of the switching tubes simultaneously; as the parameters of the switching tubes are identical, the physical and chemical properties of the switch are the same, according to energy conservation principle, each path LED obtains equivalent energy, so that the current passing through each path LED is the same, the illuminating brightness of each path LED is the same, thus realizing uniform matching of each path LED current and uniformity of illuminating brightness.
Description
Technical field
The present invention relates to lighting technical field, more particularly, relate to a kind of LED signal lamp and multipath LED drive circuit thereof.
Background technology
Along with the progress of science and technology and the implementation of energy-conserving and environment-protective, LED has been widely used in the application of signal indication aspect, railway place particularly, the application in road traffic commander place.But in being to belong to the voltage-type device by LED, small change in voltage can cause that very big electric current changes, and luminosity has great relation with the electric current that passes through, the variation of electric current can cause the variation of brightness, therefore must consider the uniformity that LED is luminous as the area source time spent, just will be close to equal by the electric current on each paths of LEDs.
At present, when LED used as area source, the general circuit structure was series, parallel, string-and series-parallel connection.When if power supply is battery, because the voltage ratio of battery is lower, with series circuit or string-and series-parallel connection then need to boost, cause the reduction of efficient, if with the then general current-limiting resistance that on every group of LED, is connected in series a similar resistance of parallel circuits, thereby reach matching current with this and reach the luminance balance purpose, but it is actual because the current-limiting resistance resistance is less, the LED pipe is pressed different, LED internal resistance resistance difference, so the actual still existence of the electric current that flows through on every paths of LEDs is more different, cause the electric current on every paths of LEDs not to be close to equal.Therefore can not solve the problem of brightness uniformity fully.
Summary of the invention
The technical problem to be solved in the present invention is that the inconsistent defective of above-mentioned LED multi-path brightness at prior art provides a kind of LED signal lamp and multipath LED drive circuit thereof, can guarantee the brightness unanimity of LED multi-path.
The technical solution adopted for the present invention to solve the technical problems is: construct a kind of multipath LED drive circuit, comprise the pwm pulse generation unit, the switching tube unit that are used to produce pwm pulse signal, described switching tube unit comprises a plurality of switching tubes that parameter is identical, switching tube of each paths of LEDs series connection, described a plurality of control end of switching tube connect one road pwm pulse signal output of the generation of described pwm pulse generation unit simultaneously.
In multipath LED drive circuit of the present invention, described parameter comprises ON time, turn-off time, conducting resistance.
In multipath LED drive circuit of the present invention, also comprise respectively and connecting with each paths of LEDs, and the identical a plurality of current-limiting resistances of resistance.
In multipath LED drive circuit of the present invention, described switching tube is a triode.
In multipath LED drive circuit of the present invention, the base stage of described triode connects the pwm pulse signal output of described pwm pulse generation unit, the grounded emitter of described triode, the collector electrode of described triode connects the negative pole of LED, and the positive pole of this LED connects positive source.
In multipath LED drive circuit of the present invention, described switching tube is a metal-oxide-semiconductor.
In multipath LED drive circuit of the present invention, described pwm pulse generation unit comprises single-chip microcomputer, and first output of single-chip microcomputer connects the base stage of a plurality of triodes simultaneously.
In multipath LED drive circuit of the present invention, described pwm pulse generation unit also comprises the switch subelement, described switch subelement comprises pull-up resistor and touch-switch, one termination power positive pole of described pull-up resistor, the other end of described pull-up resistor is by described touch-switch ground connection, and the tie point of described pull-up resistor and described touch-switch connects the interrupt signal input of described single-chip microcomputer.
In multipath LED drive circuit of the present invention, described pwm pulse generation unit also comprises the supply voltage detection sub-unit, described supply voltage detection sub-unit comprises first divider resistance and second divider resistance, described first divider resistance and described second divider resistance are connected between second output and ground of described single-chip microcomputer, and the tie point of described first divider resistance and described second divider resistance connects the supply voltage sampling input of described single-chip microcomputer.
The present invention also constructs a kind of LED signal lamp, comprises LED multi-path, comprises above-described multipath LED drive circuit.
Implement LED signal lamp of the present invention and multipath LED drive circuit thereof, the pwm pulse generation unit produces pulse signal, this pulse signal is controlled the switching of a plurality of switching tubes simultaneously, because the parameter of a plurality of switching tubes is identical, identical according to conservation of energy principle and switching tube physics, electrical characteristic, the energy that every paths of LEDs obtains equates, so the electric current by every paths of LEDs is identical, the luminosity of every paths of LEDs is identical, thereby realizes that every paths of LEDs electric current evenly mates the luminosity unanimity.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the building-block of logic of multipath LED drive circuit embodiment one of the present invention;
Fig. 2 is the building-block of logic of multipath LED drive circuit embodiment two of the present invention;
Fig. 3 is the circuit diagram corresponding with Fig. 2;
Embodiment
As shown in Figure 1, in the building-block of logic of multipath LED drive circuit embodiment one of the present invention, this multipath LED drive circuit comprises pwm pulse generation unit 100 and switching tube unit 200, wherein, pwm pulse generation unit 100 is used to produce pwm pulse signal, switching tube unit 200 is used for converting described pwm pulse signal to drive LED multi-path drive signal, switching tube unit 200 comprises a plurality of switching tubes 201 that parameter is identical, 202,203,204, wherein each switching tube is connected with every paths of LEDs respectively, and described parameter comprises ON time, conducting resistance, turn-off time etc.In this circuit, pwm pulse generation unit 100 produces pulse signal, this pulse signal is controlled the switching of a plurality of switching tubes 201,202,203,204 simultaneously, because the parameter of a plurality of switching tubes 201,202,203,204 is identical, identical according to conservation of energy principle and switching tube physics, electrical characteristic, the energy that every paths of LEDs obtains equates, so the electric current by every paths of LEDs is identical, the luminosity of every paths of LEDs is identical, thereby realizes that every paths of LEDs electric current evenly mates the luminosity equilibrium.Here a paths of LEDs is meant, LED lamp or LED string.
In the building-block of logic of the multipath LED drive circuit embodiment two of the present invention shown in Fig. 2, this multipath LED drive circuit comprises pwm pulse generation unit 100 and switching tube pipe 200, wherein, pwm pulse generation unit 100 also comprises switch subelement 101, single-chip microcomputer and supply voltage detection sub-unit 102, single-chip microcomputer is used to produce pwm pulse signal, switch subelement 101 is used for control single chip computer and begins or stop to produce pwm pulse signal, supply voltage detection sub-unit 102 is used for detecting in real time supply voltage, and testing result is sent to single-chip microcomputer, when single-chip microcomputer judges that supply voltage is lower than preset value, stop to produce pwm pulse signal.Switching tube unit 200 is used for converting described pwm pulse signal to drive LED multi-path drive signal, switching tube unit 200 comprises a plurality of switching tubes 201,202,203,204, wherein each switching tube is identical with every paths of LEDs series connection and parameter respectively, and described parameter comprises ON time, conducting resistance, turn-off time etc.In this circuit, pwm pulse generation unit 100 produces pulse signal, this pulse signal is controlled the switching of a plurality of switching tubes 201,202,203,204 simultaneously, because the parameter of a plurality of switching tubes 201,202,203,204 is identical, identical according to conservation of energy principle and switching tube physics, electrical characteristic, the energy that every paths of LEDs obtains equates, so the electric current by every paths of LEDs is identical, the luminosity of every paths of LEDs is identical, thereby realizes that every paths of LEDs electric current evenly mates the luminosity equilibrium.
In the circuit diagram of the multipath LED drive circuit embodiment two of the present invention shown in Fig. 3, the parameter of this LED multi-path is identical, and for example forward conduction voltage is identical or close, and brightness, chromaticity coordinates are approaching.This multipath LED drive circuit comprises single-chip microcomputer U1, divider resistance R10, divider resistance R11, touch-switch SW, pull-up resistor R12, triode Q1, triode Q2, triode Q3, triode Qn, the current-limiting resistance R1 that current-limiting resistance R13 and resistance are identical, current-limiting resistance R2, current-limiting resistance R3, current-limiting resistance Rn, wherein, divider resistance R10 and divider resistance R11 are connected between the 2nd pin (PB3) and ground of single-chip microcomputer U1, the tie point of divider resistance R10 and divider resistance R11 meets the 3rd pin (PB4 of single-chip microcomputer U1, supply voltage sampling input), the 4th pin (GND) ground connection of single-chip microcomputer U1, its the 8th pin (VCC) connects the positive pole of power supply, its the 5th pin (PB0, the interrupt signal input) by touch-switch SW ground connection, pull-up resistor R12 is connected between the 5th pin of positive source and single-chip microcomputer U1, the 6th pin (PB1) of single-chip microcomputer U1 connects triode Q1 respectively by current-limiting resistance R13, Q2, Q 3, the base stage of Qn, triode Q1, Q2, Q3, the emitter of Qn is ground connection respectively, the collector electrode of triode Q1 connects the negative pole of LED1, the positive pole of LED1 connects the positive pole of power supply by current-limiting resistance R1, the collector electrode of triode Q2 connects the negative pole of LED2, the positive pole of LED2 connects the positive pole of power supply by current-limiting resistance R2, the collector electrode of triode Q 3 connects the negative pole of LED3, the positive pole of LED3 connects the positive pole of power supply by current-limiting resistance R 3, the collector electrode of triode Qn connects the negative pole of LEDn, and the positive pole of LEDn connects the positive pole of power supply by current-limiting resistance Rn.
When circuit working, at first press touch-switch SW, the 5th pin of single-chip microcomputer U1 detects low level, judge that promptly touch-switch SW presses, the 6th pin of single-chip microcomputer U1 begins to export pwm pulse signal, when pwm pulse signal during at high level, because triode Q1, Q2, the service time of Q3, Qn, conducting resistance, identical, so triode Q1, Q2, Q3, Qn conducting simultaneously, the collector potential of triode Q1, Q2, Q3, Qn is dragged down simultaneously; When pulse signal during in low level, because the turn-off time of triode Q1, Q2, Q3, Qn is identical, so triode Q1, Q2, Q3, Qn end simultaneously, the collector electrode of triode Q1, Q2, Q3, Qn is exported high level simultaneously, therefore, identical according to conservation of energy principle and switching tube physics, electrical characteristic, the resistance of adding current-limiting resistance R1, R2, R3, Rn is identical, so the energy that every paths of LEDs obtains equates, electric current by every paths of LEDs is identical, the luminosity of every paths of LEDs is identical, thereby realizes that every paths of LEDs electric current evenly mates the luminosity equilibrium.If will turn-off LED multi-path, only need press touch-switch SW once more, when the 5th pin of single-chip microcomputer U1 detects low level once more, just control its 6th pin and stop to export pwm pulse signal.
When circuit working; the 2nd pin of single-chip microcomputer U1 is exported the supply voltage that its 8th pin is collected; the supply voltage that is collected is after divider resistance R10 and divider resistance R11 dividing potential drop; the 3rd pin of single-chip microcomputer U1 is gathered the voltage at resistance R 11 two ends; if supply voltage is too high or too low; the voltage at resistance R 11 two ends also can be correspondingly too high or too low; single-chip microcomputer U1 can judge that according to the input voltage of its 3rd pin supply voltage is too high or too low; and then make its 6th pin stop to export pwm pulse signal; turn-off LED multi-path, so just can protect power supply and entire circuit.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for example, the triode among the above embodiment can substitute with metal-oxide-semiconductor.For a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within the claim scope of the present invention.
Claims (10)
1. multipath LED drive circuit, it is characterized in that, comprise the pwm pulse generation unit, the switching tube unit that are used to produce pwm pulse signal, described switching tube unit comprises a plurality of switching tubes that parameter is identical, switching tube of each paths of LEDs series connection, described a plurality of control end of switching tube connect the road pwm pulse signal output that described pwm pulse generation unit produces simultaneously.
2. multipath LED drive circuit according to claim 1 is characterized in that described parameter comprises ON time, turn-off time, conducting resistance.
3. multipath LED drive circuit according to claim 1 is characterized in that, also comprises respectively connecting with each paths of LEDs, and the identical a plurality of current-limiting resistances of resistance.
4. multipath LED drive circuit according to claim 1 is characterized in that, described switching tube is a triode.
5. multipath LED drive circuit according to claim 4, it is characterized in that, the base stage of described triode connects the pwm pulse signal output of described pwm pulse generation unit, the grounded emitter of described triode, the collector electrode of described triode connects the negative pole of LED, and the positive pole of this LED connects positive source.
6. multipath LED drive circuit according to claim 1 is characterized in that, described switching tube is a metal-oxide-semiconductor.
7. multipath LED drive circuit according to claim 1 is characterized in that, described pwm pulse generation unit comprises single-chip microcomputer, and first output of single-chip microcomputer connects the base stage of a plurality of triodes simultaneously.
8. multipath LED drive circuit according to claim 7, it is characterized in that, described pwm pulse generation unit also comprises the switch subelement, described switch subelement comprises pull-up resistor and touch-switch, one termination power positive pole of described pull-up resistor, the other end of described pull-up resistor is by described touch-switch ground connection, and the tie point of described pull-up resistor and described touch-switch connects the interrupt signal input of described single-chip microcomputer.
9. multipath LED drive circuit according to claim 7, it is characterized in that, described pwm pulse generation unit also comprises the supply voltage detection sub-unit, described supply voltage detection sub-unit comprises first divider resistance and second divider resistance, described first divider resistance and described second divider resistance are connected between second output and ground of described single-chip microcomputer, and the tie point of described first divider resistance and described second divider resistance connects the supply voltage sampling input of described single-chip microcomputer.
10. a LED signal lamp comprises LED multi-path, it is characterized in that, comprises each described multipath LED drive circuit of claim 1-9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010100444396A CN101778510B (en) | 2010-01-18 | 2010-01-18 | LED signal indicator light and multipath LED drive circuits thereof |
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| CN2010100444396A CN101778510B (en) | 2010-01-18 | 2010-01-18 | LED signal indicator light and multipath LED drive circuits thereof |
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| CN101778510A true CN101778510A (en) | 2010-07-14 |
| CN101778510B CN101778510B (en) | 2013-06-19 |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102651930A (en) * | 2011-02-25 | 2012-08-29 | 海洋王照明科技股份有限公司 | LED (Light-Emitting Diode) dimming drive circuit |
| CN102651931A (en) * | 2011-02-25 | 2012-08-29 | 海洋王照明科技股份有限公司 | LED (Light-Emitting Diode) dimming drive circuit |
| CN102750897A (en) * | 2012-07-12 | 2012-10-24 | 合肥华耀电子工业有限公司 | Simple test circuit for LED (light emitting diode) display module |
| CN102769959A (en) * | 2011-05-06 | 2012-11-07 | 海洋王照明科技股份有限公司 | LED light-dimming driving circuit |
| CN102781134A (en) * | 2011-05-09 | 2012-11-14 | 海洋王照明科技股份有限公司 | Dimmable LED (Light Emitting Diode) driving circuit and lamp |
| CN103024977A (en) * | 2011-09-27 | 2013-04-03 | 瀚宇彩晶股份有限公司 | Light emitting diode driving circuit |
| CN103259244A (en) * | 2012-01-24 | 2013-08-21 | 哈米尔顿森德斯特兰德公司 | Fail protected pulse generator and system |
| CN103517529A (en) * | 2013-10-11 | 2014-01-15 | 张翔 | Low-voltage direct current lighting system |
| CN104009798A (en) * | 2014-06-13 | 2014-08-27 | 中国人民解放军信息工程大学 | Visible light communication device and system |
| CN104640301A (en) * | 2013-11-13 | 2015-05-20 | 深圳市海洋王照明工程有限公司 | Illumination circuit |
| CN104990021A (en) * | 2015-03-13 | 2015-10-21 | 河南科技大学 | Chargeable intelligent small table lamp with infrared range measurement and speech control |
| CN107295721A (en) * | 2017-08-10 | 2017-10-24 | 广东工业大学 | A kind of electric indicator lamp of LED drive circuit and LED |
| CN109709861A (en) * | 2019-01-04 | 2019-05-03 | 广东品胜电子股份有限公司 | A kind of circuit of single channel control outputting multiplex signals |
| CN112261758A (en) * | 2020-11-05 | 2021-01-22 | 西安中颖电子有限公司 | Method for compensating uniformity of LED |
| CN112287630A (en) * | 2019-07-09 | 2021-01-29 | 苏州市悠越电子有限公司 | Method for improving resistance value of inner loop of keyboard and optimizing layout of printed circuit |
| CN113242627A (en) * | 2021-05-08 | 2021-08-10 | 山东英信计算机技术有限公司 | Jig plate for assisting LED circuit design and use method |
| CN113671343A (en) * | 2021-08-12 | 2021-11-19 | 北京比特大陆科技有限公司 | Computing force board, data processing equipment and computer server |
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| CN1738505A (en) * | 2004-08-18 | 2006-02-22 | 宏达国际电子股份有限公司 | Cresset flashing device and its operating method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102651930A (en) * | 2011-02-25 | 2012-08-29 | 海洋王照明科技股份有限公司 | LED (Light-Emitting Diode) dimming drive circuit |
| CN102651931A (en) * | 2011-02-25 | 2012-08-29 | 海洋王照明科技股份有限公司 | LED (Light-Emitting Diode) dimming drive circuit |
| CN102651931B (en) * | 2011-02-25 | 2015-01-07 | 海洋王照明科技股份有限公司 | LED (Light-Emitting Diode) dimming drive circuit |
| CN102651930B (en) * | 2011-02-25 | 2014-11-19 | 海洋王照明科技股份有限公司 | LED (Light-Emitting Diode) dimming drive circuit |
| CN102769959B (en) * | 2011-05-06 | 2014-10-15 | 海洋王照明科技股份有限公司 | LED light-dimming driving circuit |
| CN102769959A (en) * | 2011-05-06 | 2012-11-07 | 海洋王照明科技股份有限公司 | LED light-dimming driving circuit |
| CN102781134A (en) * | 2011-05-09 | 2012-11-14 | 海洋王照明科技股份有限公司 | Dimmable LED (Light Emitting Diode) driving circuit and lamp |
| CN102781134B (en) * | 2011-05-09 | 2014-11-05 | 海洋王照明科技股份有限公司 | Dimmable LED (Light Emitting Diode) driving circuit and lamp |
| CN103024977A (en) * | 2011-09-27 | 2013-04-03 | 瀚宇彩晶股份有限公司 | Light emitting diode driving circuit |
| CN103024977B (en) * | 2011-09-27 | 2015-08-19 | 瀚宇彩晶股份有限公司 | Light emitting diode driving circuit |
| US8901833B2 (en) | 2011-09-27 | 2014-12-02 | Hannstar Display Corporation | LED driving circuit preventing light leakage issue |
| CN103259244A (en) * | 2012-01-24 | 2013-08-21 | 哈米尔顿森德斯特兰德公司 | Fail protected pulse generator and system |
| CN103259244B (en) * | 2012-01-24 | 2015-12-02 | 哈米尔顿森德斯特兰德公司 | Error protection pulse generator and system |
| CN102750897A (en) * | 2012-07-12 | 2012-10-24 | 合肥华耀电子工业有限公司 | Simple test circuit for LED (light emitting diode) display module |
| CN102750897B (en) * | 2012-07-12 | 2015-02-11 | 合肥华耀电子工业有限公司 | Simple test circuit for LED (light emitting diode) display module |
| CN103517529A (en) * | 2013-10-11 | 2014-01-15 | 张翔 | Low-voltage direct current lighting system |
| CN104640301A (en) * | 2013-11-13 | 2015-05-20 | 深圳市海洋王照明工程有限公司 | Illumination circuit |
| CN104009798A (en) * | 2014-06-13 | 2014-08-27 | 中国人民解放军信息工程大学 | Visible light communication device and system |
| CN104009798B (en) * | 2014-06-13 | 2016-09-14 | 中国人民解放军信息工程大学 | A kind of visible light communication equipment and system |
| CN104990021A (en) * | 2015-03-13 | 2015-10-21 | 河南科技大学 | Chargeable intelligent small table lamp with infrared range measurement and speech control |
| CN107295721A (en) * | 2017-08-10 | 2017-10-24 | 广东工业大学 | A kind of electric indicator lamp of LED drive circuit and LED |
| CN107295721B (en) * | 2017-08-10 | 2023-05-09 | 广东工业大学 | LED drive circuit and LED electric indicator lamp |
| CN109709861A (en) * | 2019-01-04 | 2019-05-03 | 广东品胜电子股份有限公司 | A kind of circuit of single channel control outputting multiplex signals |
| CN112287630A (en) * | 2019-07-09 | 2021-01-29 | 苏州市悠越电子有限公司 | Method for improving resistance value of inner loop of keyboard and optimizing layout of printed circuit |
| CN112261758A (en) * | 2020-11-05 | 2021-01-22 | 西安中颖电子有限公司 | Method for compensating uniformity of LED |
| CN112261758B (en) * | 2020-11-05 | 2023-04-28 | 西安中颖电子有限公司 | Method for compensating uniformity of LED |
| CN113242627A (en) * | 2021-05-08 | 2021-08-10 | 山东英信计算机技术有限公司 | Jig plate for assisting LED circuit design and use method |
| CN113671343A (en) * | 2021-08-12 | 2021-11-19 | 北京比特大陆科技有限公司 | Computing force board, data processing equipment and computer server |
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