CN101925214B - LED constant current circuit and method - Google Patents
LED constant current circuit and method Download PDFInfo
- Publication number
- CN101925214B CN101925214B CN 200910108331 CN200910108331A CN101925214B CN 101925214 B CN101925214 B CN 101925214B CN 200910108331 CN200910108331 CN 200910108331 CN 200910108331 A CN200910108331 A CN 200910108331A CN 101925214 B CN101925214 B CN 101925214B
- Authority
- CN
- China
- Prior art keywords
- led lamp
- led
- constant current
- mcu controller
- constant
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 20
- 239000003990 capacitor Substances 0.000 claims description 19
- 238000001914 filtration Methods 0.000 claims description 14
- 230000001681 protective effect Effects 0.000 claims description 13
- 238000010521 absorption reaction Methods 0.000 claims description 5
- 230000002441 reversible effect Effects 0.000 claims description 3
- 230000001052 transient effect Effects 0.000 abstract description 2
- 230000001360 synchronised effect Effects 0.000 description 5
- 230000007704 transition Effects 0.000 description 5
- 238000005286 illumination Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 101100339482 Colletotrichum orbiculare (strain 104-T / ATCC 96160 / CBS 514.97 / LARS 414 / MAFF 240422) HOG1 gene Proteins 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
Images
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention provides an LED constant current circuit which comprises an MCU controller, a constant current driving unit, an LED lamp, an input unit and a detecting unit, wherein the detecting unit collects current or voltage signals of the LED lamp; and the MCU controller outputs PWM waves with gradually increased duty ratios one by one, analyzes and determines the minimum value of the duty ratio of the PWM waves when the current or voltage of the LED lamp is the maximum, regularly outputs the PWM waves, and enables the LED lamp to normally light through the constant current driving unit. The invention also provides an LED constant current method. The circuit and the implementation method of the invention can resist transient high-energy pulse interference, solves the problem of generating error signals due to interference, realizes precise constant current and adjustable constant current, and enables the LED lamp to light with constant illuminance.
Description
Technical field
The present invention relates to a kind of illumination control circuit and method, more particularly, relate to a kind of constant-current circuit and method of LED lamp.
Background technology
The drive circuit of existing LED lamp comprises MCU controller 10, constant current driving unit 20, LED lamp 30 as shown in Figure 1.Fixedly the PWM ripple is to constant current driving unit 20 for 10 outputs of MCU controller, and constant current driving unit 20 is alternating current with dc inverter, then carries out constant current output, and driving LED lamp 30 realizes that the LED lamp is normally luminous.At present, constant current driving unit generally all is to adopt constant current chip, and constant current chip generally all to be a kind of model can only export fixing electric current.After changing different capacity LED lamp, required drive current will change, and therefore common constant current chip can not satisfy its requirement, need to adopt somewhat expensive adjustable constant-flow to drive chip, increase circuit cost.
When the external world need to control the LED lamp, drive circuit also comprised input unit 40.Input unit 40 produces switching signal, and MCU controller 10 is exported corresponding LED lamp switch control signal according to this switching signal, controls corresponding LED lamp 30 light on and off.The switching signal that existing input unit produces directly connects MCU controller I/O mouth, does not have protective unit, is easy to be subject to the transition high energy pulse and disturbs, and makes controller receive the malfunction signal, carries out false triggering.Such as, the High-frequency Interference of intercom, high-power machinery switching over interference etc.
Summary of the invention
The technical problem to be solved in the present invention is, can not mate the defective that different capacity LED lamp and input signal are subject to the impulse disturbances impact easily for common constant current chip, a kind of LED lamp drive circuit and method that can resist the transition high energy pulse to disturb and provide constant current to drive is provided.
The invention provides a kind of LED constant-current circuit, comprise MCU controller, constant current driving unit, LED lamp, it is characterized in that, also comprise the detecting unit that is connected to gather LED lamp current or voltage signal with the LED lamp; Described MCU controller is exported one by one has the from low to high PWM ripple of duty ratio, power to the LED lamp by constant current driving unit successively, the PWM ripple control of different duty produces different LED lamp current or voltage signal, described detecting unit gathers the curtage signal of LED lamp and exports to the MCU controller, described MCU controller is analyzed the curtage signal of described LED lamp and corresponding two groups of data of PWM ripple duty ratio with it, determine the PWM ripple duty ratio minimum value when LED lamp current or voltage reach maximum, then the PWM ripple of fixing this duty ratio of output makes described LED lamp normally luminous by described constant current driving unit.
LED constant-current circuit of the present invention also comprises input unit; Described input unit produces switching signal, and described MCU controller is based on described switching signal output LED lamp switch control signal, by described constant current driving unit control LED lamp on/off.
In LED constant-current circuit of the present invention, between described input unit and MCU controller, also be connected with protective unit, it carries out exporting to the MCU controller after the filtering to described switching signal.
In LED constant-current circuit of the present invention, the corresponding described input unit of described each LED lamp, a described protective unit and a described detecting unit.
In LED constant-current circuit of the present invention, described constant current driving unit comprises the first triode, the first resistance, the second resistance, inductance coil, electrochemical capacitor, diode, interface, the second triode and the 3rd resistance; The base stage of described the first triode is connected with the PWM ripple delivery outlet of described MCU controller by the first resistance, and its emitter is connected to high level, and its collector electrode is by reverse diode ground connection; Second resistance of connecting between the emitter of the first triode and the base stage; The collector electrode of the first triode is by inductance coil connection of being connected with electrochemical capacitor, electrochemical capacitor minus earth; Node between inductance coil and the electrochemical capacitor is connected to the collector electrode of the second triode by interface; The base stage of the second triode is connected to the delivery outlet that the MCU controller is controlled this paths of LEDs lamp switch control signal by the 3rd resistance.
In LED constant-current circuit of the present invention, described protective unit comprises the absorption resistance that is connected between input unit and the MCU controller.
The present invention also provides a kind of LED constant current method, comprises the following steps:
The MCU controller is exported one by one has the from low to high PWM ripple of duty ratio, successively constant-current driving LED lamp, simultaneously the curtage signal of detecting unit synchronous acquisition LED lamp;
The MCU controller is analyzed the different PWM ripple duty ratios of its output and corresponding LED lamp current or these two groups of data of voltage signal with it, determines the PWM ripple duty ratio minimum value when LED lamp current or voltage reach maximum;
The PWM ripple that the output of MCU controller has above-mentioned duty ratio makes the LED lamp normally luminous by the constant current driving.
In LED constant current method of the present invention, also comprise the following steps:
Produce switching signal by input unit;
The described switching signal that receives is carried out filtering;
The MCU controller is exported corresponding LED lamp switch control signal according to filtered switching signal, control LED lamp on/off.
LED constant-current circuit of the present invention by detecting unit synchronous acquisition LED modulating voltage or the current signal that increases, and utilizes MCU controller regulation output PWM ripple, realizes the purpose of accurate constant current; Simultaneously can be for the LED lamp of different capacity, lamp current or voltage signal that output matches make its permanent illumination luminous, thereby realize the purpose of adjustable constant-flow.The present invention also by increase protective unit behind input unit, carries out filtering to the switching signal that input unit produces, and filtering transition high energy disturbing pulse reduces the interference of transition high energy pulse, has solved the problem that produces error signal because of interference.Constant current driving unit of the present invention is used the LC series resonant circuit, adopts simple components and parts combination, realizes the purpose of constant current.LED constant current method of the present invention, utilization is flexible, stable, reliable, can realize simultaneously the function of accurate constant current and adjustable constant-flow.
Description of drawings
Fig. 1 is the structural representation of existing LED lamp drive circuit;
Fig. 2 is the structural representation of a kind of LED constant-current circuit of the present invention embodiment;
Fig. 3 is the circuit theory diagrams of a kind of LED constant-current circuit of the present invention embodiment;
Fig. 4 is the flow chart of a kind of LED constant current of the present invention embodiment of the method.
Embodiment
The present invention is further described below in conjunction with accompanying drawing.
Fig. 2 is the structural representation of a kind of LED constant-current circuit of the present invention embodiment.This circuit comprises MCU controller 100, constant current driving unit 200, LED lamp 300, input unit 400, the protective unit 600 that the switching signal that also comprise the detecting unit 500 that is connected to gather LED lamp 300 curtage signals with LED lamp 300, described input unit 400 is produced is carried out filtering; Described MCU controller 100 based on the filtering of described protective unit 600 outputs after switching signal, produce LED lamp switch control signal, by 300 light on and off of constant current driving unit 200 control LED lamps; Described MCU controller 100 is exported one by one has the from low to high PWM ripple of duty ratio, give the LED lamp 300 power supplies by constant current driving unit 200 successively, the curtage signal of described detecting unit 500 synchronous acquisition LED lamps, described constant current driving unit (200) comprises switch triode and LC series resonant circuit, the PWM ripple control of different duty produces different LED lamp current or voltage signal, MCU controller 100 is analyzed these two groups of data, determine the PWM ripple duty ratio minimum value when LED lamp current or voltage reach maximum, then the PWM ripple of fixing this duty ratio of output makes described LED lamp 300 normally luminous by described constant current driving unit 200.
Fig. 3 is the circuit theory diagrams of a kind of LED constant-current circuit of the present invention embodiment.Present embodiment is signalman's torch illuminating circuit.The MCU controller 100 that the present embodiment circuit is selected is HT46R47 chip, i.e. U1 among the figure.Present embodiment comprises 3 LED lamps, and each LED lamp has corresponding input unit, protective unit and detecting unit.But enforcement of the present invention does not limit the quantity of LED lamp, can determine according to actual needs the quantity of LED lamp with used MCU controller.3 input units 400 comprise key switch S1, S2 and S3.Key switch S1, S2, S3 be corresponding white, green and red LED lamp respectively.The end ground connection of key switch S1, S2, S3, the other end are connected to respectively pin 3 (PA1), 2 (PA2) and 4 (PA0) of U1 by absorption resistance R14, R15, R16.Absorption resistance R14, R15, R16 consist of 3 protective units 600.Three key switches produce switching signal, and coupled absorption resistance carries out filtering to its signal, filtering transient state high energy pulse signal, and output is processed for U1.U1 receives this filtered switching signal, respectively at pin 15 (PA7), 17 (PA5), 16 (PA6) of U1, export corresponding switch controlling signal control triode Q3, Q4, Q2 conducting, thereby make white led lamps, green LED lamp and the red LED lamp conducting that is connected with triode Q3, Q4, Q2 collector terminal respectively.The pin 15 (PA7) of U1,17 (PA5), 16 (PA6) link to each other with triode Q3, Q4, Q2 base stage by resistance R 5, R4, R6 respectively.When lighting white led lamps in advance, button S1 conducting, it is low level that U1 detects input pin PA1, and then pin 15 (PA7) the output high level of control driving white led lamps, the triode Q3 that the conducting white led lamps is corresponding, thus realize lighting.The control procedure of other LED lamp is identical with the control procedure of white led lamps.The enterprises such as railway, electric power, public security, oil field, petrochemical industry, metallurgy, industrial and mineral use signalman's torch as miniature signal lamp more, as signal designation, security warning and operating illumination etc.The user also has intercom usually as communication apparatus, during the intercom communication signalman's torch is produced interference, makes easily the MCU controller receive wrong start signal.Therefore, the protective unit that increases anti-transition high energy pulse interference is extremely important, has avoided false triggering.
The constant current driving unit 200 of present embodiment comprises triode Q1, inductance coil L2, electrochemical capacitor C5, resistance R 7, diode D1.The pin 10 (PWM) of U1 is exported the PWM ripple, is connected to the base stage of triode Q1 by resistance R 7.The emitter of triode Q1 is connected to VCC.Link to each other by resistance R 10 between base stage and the emitter.It is anodal that the collector electrode of triode Q1 is connected to electrochemical capacitor C5 by inductance coil L2.Electrochemical capacitor C5 minus earth.The collector electrode of triode Q1 is by reverse diode D1 ground connection.When the pin 10 (PWM) of U1 output high level, be added in voltage on the R10 less than the cut-in voltage of triode Q1, triode Q1 turn-offs, then collector electrode no current output.When pin 10 (PWM) output low level of U1, be added in voltage on the R10 greater than the cut-in voltage of triode Q1, triode Q1 conducting, the collector electrode output current of triode Q1 carries out resonance by the LC series circuit that inductance coil L2 and electrochemical capacitor C5 form.In the LC series circuit of inductance coil L2 and electrochemical capacitor C5 composition, if give capacitor charging, just can in circuit, produce the vibration of simple harmonic quantity form's freedom, in circuit, add an alternating signal source this moment, constantly give the circuit makeup energy, make vibration be continued to carry out, form forced vibration.When the PWM wave frequency that arranges as U1 was consistent with LC series circuit frequency, circuit reached the state of resonance, thus the function of realization constant current.LED lamp 300 comprises green LED lamp, white led lamps and red LED lamp.Node between inductance coil L2 and the electrochemical capacitor C5 is connected to 4 pin of interface J1, and 1,2,3 pin of interface J1 link to each other with the collector electrode of triode Q4, Q3 and Q2 respectively.The indirect load green LED lamp of 1 pin of interface J1 and 4 pin, the indirect load red LED lamp of 2 pin of interface J1 and 4 pin, the indirect load white led lamps of 3 pin of interface J1 and 4 pin.Triode Q4 links to each other with the emitter of Q2, and this node is connected to U1 pin 6 (PB2/AN2), simultaneously by resistance R 9 ground connection.The emitter of triode Q3 is connected to U1 pin 7 (PB1/AN1), simultaneously by resistance R 8 ground connection.Being connected between the emitter of triode Q4, Q3 and Q2 and the U1, and resistance R 8 and R9 consist of 3 detecting units 500 together, is used for gathering the curtage signal of LED lamp, for the U1 analyzing and processing.U1 exports one by one has the from low to high PWM ripple of duty ratio, give the LED lamp 300 power supplies by constant current driving unit 200 successively, detecting unit 500 synchronous acquisition LED lamp current or voltage signals, obtain different PWM ripple duty ratios and LED lamp current correspondingly or two groups of data of voltage signal of output, PWM ripple duty ratio minimum value when then determining LED lamp current or voltage max, the PWM ripple of fixing this duty ratio of output, normally luminous by constant current driving unit driving LED lamp.Constant current driving unit of the present invention is used the LC series resonant circuit, adopts simple components and parts combination, reaches the purpose that closed loop detects constant current by the detecting unit that increases.The present embodiment circuit can also adapt to the LED lamp power of different capacity, reaches the purpose of adjustable constant-flow.Circuit application of the present invention is more extensive, flexible, stable, reliable, and has reduced cost.
The operation level of U1 is provided by flash-light battery BT1.Battery BT1 minus earth, anodal output VCC.VCC is by electrochemical capacitor C1 ground connection.The pin 12 (VDD) of U1 is connected to VCC by inductance coil L1.Pin 9 (VSS) ground connection of U1.The pin 12 (VDD) of U1 is by the resistance R 1 and capacitor C 4 ground connection of series connection.Node between resistance R 1 and the capacitor C 4 is connected to the pin 11 (RES) of U1.The pin 12 (VDD) of U1 is by capacitor C 3 ground connection.U1 lowers power supply noise by RC filtering to be disturbed.The pin 13 (OSC1) of U1 is by resistance R 2 ground connection.The U1 circuit also comprises battery detection unit.The pin 1 (PA3/PFD) of U1 is exported the high level that equates with VCC, be connected to pin 8 (PB0/AN0) by resistance R 3; The plus earth of benchmark voltage stabilizing chip U2, negative electrode and be connected to the pin 8 (PB0/AN0) of U1 with reference to the utmost point.U1 analyzes according to the curtage signal of pin 8 (PB0/AN0) input, judges battery electric quantity.When battery was lower than 2.5 volts of the reference voltages of benchmark voltage stabilizing chip U2, the flicker of U1 control LED lamp was changed battery with reminding user.
Fig. 4 is the flow chart of a kind of LED constant current of the present invention embodiment of the method.The method comprises following implementation step: step S1, produces switching signal; Step S2 carries out filtering to switching signal, and filtering transition high energy pulse disturbs, and processes for the MCU controller; Step S3, MCU controller according to filtering after switching signal produce LED lamp switch control signal, with control LED lamp on/off; Step S4, MCU controller export one by one has from low to high the PWM ripple of duty ratio, successively constant-current driving LED lamp; Step S5, the curtage signal of detecting unit synchronous acquisition LED lamp; Step S6, MCU controller analyze the different PWM ripple duty ratios of its output and corresponding LED lamp current or these two groups of data of voltage signal with it, determine the PWM ripple duty ratio minimum value when LED lamp current or voltage reach maximum; Step S7, MCU controller fix the PWM ripple of output step S6 gained duty ratio, and work with LED lamp switch control signal one, and the driving LED lamp is normally luminous.LED constant current method of the present invention is simple, and circuit realizes that cost is low.The method can realize the function of accurate constant current and adjustable constant-flow simultaneously, adapts to the LED lamp of different capacity, makes it normally luminous.
Claims (8)
1. LED constant-current circuit, comprise MCU controller (100), constant current driving unit (200), LED lamp (300), it is characterized in that, also comprise with LED lamp (300) being connected to gather the detecting unit (500) of LED lamp (300) curtage signal; Described MCU controller (100) is exported one by one has the from low to high PWM ripple of duty ratio, give LED lamp (300) power supply by constant current driving unit (200) successively, described constant current driving unit (200) comprises switch triode and LC series resonant circuit, the PWM ripple control of different duty produces different LED lamp current or voltage signal, described detecting unit (500) gathers the curtage signal of LED lamp and exports to MCU controller (100), described MCU controller (100) is analyzed the curtage signal of described LED lamp and two groups of data of PWM ripple duty ratio of correspondence with it, determine the PWM ripple duty ratio minimum value when LED lamp current or voltage reach maximum, then the PWM ripple of fixing this duty ratio of output makes described LED lamp (300) normally luminous by described constant current driving unit (200).
2. LED constant-current circuit according to claim 1 is characterized in that, also comprises input unit (400); Described input unit (400) produces switching signal, and described MCU controller (100) is based on described switching signal output LED lamp switch control signal, by the light on and off of described constant current driving unit (200) control LED lamp (300).
3. LED constant-current circuit according to claim 2, it is characterized in that, also be connected with protective unit (600) between described input unit (400) and MCU controller (100), it carries out exporting to MCU controller (100) after the filtering to described switching signal.
4. LED constant-current circuit according to claim 3 is characterized in that, the corresponding described input unit of described each LED lamp, a described protective unit and a described detecting unit.
5. according to claim 3 or 4 described LED constant-current circuits, it is characterized in that described constant current driving unit (200) comprises the first triode (Q1), the first resistance (R7), the second resistance (R10), inductance coil (L2), electrochemical capacitor (C5), diode (D1), interface (J1), the second triode (Q4) and the 3rd resistance (R4); The base stage of described the first triode (Q1) is connected with the PWM ripple delivery outlet of described MCU controller (100) by the first resistance (R7), and its emitter is connected to high level, and its collector electrode is by reverse diode (D1) ground connection; The second resistance (R10) of connecting between the emitter of the first triode (Q1) and the base stage; The collector electrode of the first triode (Q1) is connected C5 by inductance coil (L2) with electrochemical capacitor) anodal connection, electrochemical capacitor (C5) minus earth; Node between inductance coil (L2) and the electrochemical capacitor (C5) is connected to the collector electrode of the second triode (Q4) by interface (J1); The base stage of the second triode (Q4) is connected to the delivery outlet that MCU controller (100) is controlled this paths of LEDs lamp switch control signal by the 3rd resistance (R4).
6. LED constant-current circuit according to claim 5 is characterized in that, described protective unit (600) comprises the absorption resistance that is connected between input unit (400) and the MCU controller (100).
7. a LED constant current method is characterized in that, comprises the following steps:
Export from low to high the PWM ripple of duty ratio, successively constant-current driving LED lamp;
Gather the curtage signal of LED lamp;
Analyze the PWM ripple of described from low to high duty ratio and LED lamp current or the voltage signal of described collection, determine the PWM ripple duty ratio of minimum when LED lamp current or voltage reach maximum;
Export the PWM ripple of described duty ratio minimum value, it is luminous to drive described LED lamp.
8. LED constant current method according to claim 7 is characterized in that, also comprises the following steps:
Produce switching signal by input unit;
The described switching signal that receives is carried out filtering;
According to filtered switching signal, export corresponding LED lamp switch control signal, control described LED lamp on/off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910108331 CN101925214B (en) | 2009-06-17 | 2009-06-17 | LED constant current circuit and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910108331 CN101925214B (en) | 2009-06-17 | 2009-06-17 | LED constant current circuit and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101925214A CN101925214A (en) | 2010-12-22 |
| CN101925214B true CN101925214B (en) | 2013-03-27 |
Family
ID=43339748
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200910108331 Active CN101925214B (en) | 2009-06-17 | 2009-06-17 | LED constant current circuit and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101925214B (en) |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102811524B (en) * | 2011-05-31 | 2015-08-26 | 海洋王照明科技股份有限公司 | A kind of LED lamp and control circuit thereof |
| CN103179713A (en) * | 2011-12-20 | 2013-06-26 | 常熟卓辉光电科技有限公司 | Large-power light-emitting diode (LED) drive circuit |
| CN104049192B (en) * | 2013-03-15 | 2016-12-28 | 海洋王（东莞）照明科技有限公司 | Low-power LED testing device and multi-path constant-current output circuit thereof |
| CN103648220A (en) * | 2013-12-23 | 2014-03-19 | 东莞市奥普特自动化科技有限公司 | Controller for automatically detecting maximum working current of light source and detection method thereof |
| CN104955195B (en) * | 2014-03-25 | 2019-03-26 | 深圳市海洋王照明工程有限公司 | A kind of wireless control lamps circuit |
| CN104955196B (en) * | 2014-03-25 | 2019-06-21 | 深圳市海洋王照明工程有限公司 | A kind of indicator light circuit |
| CN106486052B (en) * | 2015-08-26 | 2023-08-04 | 佛山市顺德区美的电热电器制造有限公司 | A display control circuit, a display control method using the display control circuit, and household appliances |
| CN106714420A (en) * | 2016-12-16 | 2017-05-24 | 上海希格玛高技术有限公司 | Circuit for controlling stable output of lamp tube intensity |
| CN106658922A (en) * | 2017-01-17 | 2017-05-10 | 河南智圣普电子技术有限公司 | Multichannel high-efficiency solid-state illumination system with shearable light source |
| CN111511071B (en) * | 2019-01-31 | 2022-07-08 | 松下知识产权经营株式会社 | PWM signal correction method and LED lighting device |
| CN112512172A (en) * | 2020-12-25 | 2021-03-16 | 深圳市瑞必达科技有限公司 | Low-cost self-adaptive input voltage ultralow standby dimming circuit |
| CN113411932B (en) * | 2021-05-19 | 2023-11-28 | 深圳拓邦股份有限公司 | A constant brightness LED circuit and electronic equipment |
| CN113766704A (en) * | 2021-09-23 | 2021-12-07 | 盈帜科技（常州）有限公司 | A new type of fire emergency lighting circuit |
| CN115734428B (en) * | 2022-12-28 | 2024-05-31 | 威海中远海运重工科技有限公司 | Constant-power electrodeless dimming control system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2694695Y (en) * | 2004-04-15 | 2005-04-20 | 陈平 | Intelligent high power LED driver |
| CN201170458Y (en) * | 2008-03-13 | 2008-12-24 | 杨书水 | Microcomputer DC multi-purpose high-power LED lighting energy-saving lamp |
-
2009
- 2009-06-17 CN CN 200910108331 patent/CN101925214B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2694695Y (en) * | 2004-04-15 | 2005-04-20 | 陈平 | Intelligent high power LED driver |
| CN201170458Y (en) * | 2008-03-13 | 2008-12-24 | 杨书水 | Microcomputer DC multi-purpose high-power LED lighting energy-saving lamp |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101925214A (en) | 2010-12-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101925214A (en) | LED constant current circuit and method | |
| CN101888730B (en) | Alternating current constant current source LED driving circuit | |
| CN102781139B (en) | Lighting device for lighting solid-state light source and illumination apparatus using same | |
| CN102711307B (en) | Dimmable light-emitting diode (LED) drive circuit and lamp | |
| CN103442501B (en) | Forced constant flow source dimming LED (Light Emitting Diode) lamp | |
| CN101754530B (en) | Driving circuit with dimming controller for driving light sources, method and system therefor | |
| CN101389168B (en) | High-voltage large power LCD constant current driving device | |
| CN104902653B (en) | A kind of LED constant pressures dimming power source and LED lamp light adjusting system | |
| CN101765273B (en) | Stepless dimming LED drive circuit | |
| CN201813599U (en) | LED (Light-Emitting Diode) dimmer power | |
| CN102014557A (en) | LED dimming power supply | |
| CN103582217A (en) | LED drive circuit with controllable current ripples | |
| CN102612196B (en) | LED (Light Emitting Diode) constant-current drive circuit and LED lamp using same | |
| CN102448211A (en) | Light emitting diode driving circuit | |
| CN105338690B (en) | A kind of LED dimming power sources | |
| CN102781134A (en) | Dimmable LED (Light Emitting Diode) driving circuit and lamp | |
| CN106804080A (en) | A kind of LED drive circuit and LED | |
| CN102843804A (en) | Touch control circuit and electric torch | |
| KR101414902B1 (en) | AC LED driving circuit | |
| CN105025636A (en) | Light-emitting diode (LED) dimming circuit | |
| CN101212850B (en) | Pulsed driven LED lighting circuit | |
| CN206024154U (en) | LED light modulating devices and LED drive power | |
| CN202425146U (en) | A driving circuit for an LED lighting device | |
| CN203537645U (en) | Induction type HID electronic trigger circuit and HID light fixture | |
| CN103068096A (en) | Light-emitting diode (LED) lamp, current sampling circuit and drive circuit of LED lamp |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |