CN101925214A - LED constant current circuit and method - Google Patents
LED constant current circuit and method Download PDFInfo
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- CN101925214A CN101925214A CN2009101083316A CN200910108331A CN101925214A CN 101925214 A CN101925214 A CN 101925214A CN 2009101083316 A CN2009101083316 A CN 2009101083316A CN 200910108331 A CN200910108331 A CN 200910108331A CN 101925214 A CN101925214 A CN 101925214A
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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.Constant current driving unit 20 is given in MCU controller 10 outputs fixedly PWM ripple, and constant current driving unit 20 is an alternating current with dc inverter, carries out constant current output then, and driving LED lamp 30 realizes that the LED lamp is normally luminous.At present, constant current driving unit generally all is to adopt the constant current chip, and the 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 chip for driving, increase circuit cost.
When the external world need 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 subjected 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, the high-power machinery switch switches 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 subjected to the impulse disturbances influence easily at 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 driving 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 with the LED lamp being connected to gather the detecting unit of LED lamp current or voltage signal; Described MCU controller is exported one by one has the PWM ripple of duty ratio from low to high, give the power supply of 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 is gathered the curtage signal of LED lamp and is exported to the MCU controller, described MCU controller is analyzed the curtage signal of described LED lamp and corresponding with it two groups of data of PWM ripple duty ratio, determine the PWM ripple duty ratio minimum value when LED lamp current or voltage reach maximum, the PWM ripple of fixing then 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 first triode, first resistance, second resistance, inductance coil, electrochemical capacitor, diode, interface, second triode and the 3rd resistance; The base stage of described first triode is connected with the PWM ripple delivery outlet of described MCU controller by 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 first triode and the base stage; The collector electrode of first triode is connected the electrochemical capacitor minus earth by inductance coil and electrochemical capacitor are anodal; Node between inductance coil and the electrochemical capacitor is connected to the collector electrode of second triode by interface; The base stage of 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 PWM ripple of duty ratio from low to high, successively constant-current driving LED lamp, the curtage signal of detecting unit synchronous acquisition LED lamp simultaneously;
The MCU controller is analyzed the different PWM ripple duty ratios of its output and corresponding with it LED lamp current or these two groups of data of voltage signal, 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 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 the MCU controller to regulate output PWM ripple, realizes the purpose of accurate constant current; Simultaneously can be at 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 the function of accurate constant current and adjustable constant-flow simultaneously.
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 method embodiment.
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, also comprises being connected the protective unit 600 that the switching signal that produces with the detecting unit 500 of gathering LED lamp 300 curtage signals, to described input unit 400 is carried out filtering with LED lamp 300; 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 PWM ripple of duty ratio from low to high, 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, the PWM ripple of fixing then 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 for use is HT46R47 chip, i.e. U1 among the figure.Present embodiment comprises 3 LED lamps, and each LED lamp all 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 the quantity of LED lamp according to actual needs with used MCU controller.3 input units 400 comprise key switch S1, S2 and S3.The corresponding respectively white of key switch S1, S2, S3, green and red LED lamp.The end ground connection of key switch S1, S2, S3, the other end are connected to pin 3 (PA1), 2 (PA2) and 4 (PA0) of U1 respectively by absorption resistance R14, R15, R16.Absorption resistance R14, R15, R16 constitute 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 handled 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 the pin 15 (PA7) of controlling and driving white led lamps output high level, the triode Q3 of conducting white led lamps correspondence, thus realize lighting.The control procedure of other LED lamp is identical with the control procedure of white led lamps.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 indication, 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 the MCU controller receive wrong start signal easily.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.The collector electrode of triode Q1 is connected to electrochemical capacitor C5 positive pole 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 to capacitor charging, the free oscillation that just can in circuit, produce the simple harmonic quantity form, 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 is provided with 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.Between the emitter of triode Q4, Q3 and Q2 and the U1 be connected and resistance R 8 and R9 constitute 3 detecting units 500 together, be used to gather the curtage signal of LED lamp, for the U1 analyzing and processing.U1 exports one by one has the PWM ripple of duty ratio from low to high, 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 determining LED lamp current or voltage max then, 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 to remind the user.
Fig. 4 is the flow chart of a kind of LED constant current of the present invention method embodiment.This 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 handles 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 the PWM ripple of duty ratio, constant-current driving LED lamp successively from low to high; 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 with it LED lamp current or these two groups of data of voltage signal, 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.This 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. a LED constant-current circuit comprises MCU controller (100), constant current driving unit (200), LED lamp (300), it is characterized in that, also comprises 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 PWM ripple of duty ratio from low to high, give LED lamp (300) power supply by constant current driving unit (200) successively, the PWM ripple control of different duty produces different LED lamp current or voltage signal, described detecting unit (500) is gathered the curtage signal of LED lamp and is exported to MCU controller (100), described MCU controller (100) is analyzed the curtage signal of described LED lamp and corresponding with it two groups of data of PWM ripple duty ratio, determine the PWM ripple duty ratio minimum value when LED lamp current or voltage reach maximum, the PWM ripple of fixing then 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 is characterized in that, also is connected with protective unit (600) between described input unit (400) and MCU controller (100), and 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 each described LED constant-current circuit of claim 1 to 4, it is characterized in that described constant current driving unit (200) comprises first triode (Q1), first resistance (R7), second resistance (R10), inductance coil (L2), electrochemical capacitor (C5), diode (D1), interface (J1), second triode (Q4) and the 3rd resistance (R4); The base stage of described first triode (Q1) is connected with the PWM ripple delivery outlet of described MCU controller (100) by first resistance (R7), and its emitter is connected to high level, and its collector electrode is by reverse diode (D1) ground connection; Second resistance (R10) of connecting between the emitter of first triode (Q1) and the base stage; The collector electrode of first triode (Q1) is connected electrochemical capacitor (C5) minus earth by inductance coil (L2) and electrochemical capacitor (C5) are anodal; Node between inductance coil (L2) and the electrochemical capacitor (C5) is connected to the collector electrode of second triode (Q4) by interface (J1); The base stage of 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 the PWM ripple of duty ratio from low to high;
Gather the curtage signal of LED lamp;
Analyze the PWM ripple of described duty ratio from low to high and the 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.
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| CN 200910108331 CN101925214B (en) | 2009-06-17 | 2009-06-17 | LED constant current circuit and method |
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Cited By (12)
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| CN102811524A (en) * | 2011-05-31 | 2012-12-05 | 海洋王照明科技股份有限公司 | 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 |
| 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 |
| CN104049192A (en) * | 2013-03-15 | 2014-09-17 | 海洋王（东莞）照明科技有限公司 | Low-power LED test apparatus and multipath constant current output circuit thereof |
| CN104955195A (en) * | 2014-03-25 | 2015-09-30 | 深圳市海洋王照明工程有限公司 | Wireless control lamp circuit |
| CN104955196A (en) * | 2014-03-25 | 2015-09-30 | 深圳市海洋王照明工程有限公司 | Indicating lamp circuit |
| CN106486052A (en) * | 2015-08-26 | 2017-03-08 | 佛山市顺德区美的电热电器制造有限公司 | A kind of display control circuit and method and the household electrical appliance of display control are carried out using display control circuit |
| 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 |
| 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 |
| CN111511071A (en) * | 2019-01-31 | 2020-08-07 | 松下知识产权经营株式会社 | PWM signal correction method, L ED lighting device |
| CN113411932A (en) * | 2021-05-19 | 2021-09-17 | 深圳拓邦股份有限公司 | Constant-brightness LED circuit and electronic equipment |
| CN115734428A (en) * | 2022-12-28 | 2023-03-03 | 威海中远海运重工科技有限公司 | Constant-power stepless dimming control system |
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| 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 |
| CN102811524A (en) * | 2011-05-31 | 2012-12-05 | 海洋王照明科技股份有限公司 | 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 | A kind of low-power LED test device and multiple constant current output circuit thereof |
| CN104049192A (en) * | 2013-03-15 | 2014-09-17 | 海洋王（东莞）照明科技有限公司 | Low-power LED test apparatus and multipath 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 |
| 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 |
| CN104955196A (en) * | 2014-03-25 | 2015-09-30 | 深圳市海洋王照明工程有限公司 | Indicating lamp circuit |
| 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 |
| CN104955195A (en) * | 2014-03-25 | 2015-09-30 | 深圳市海洋王照明工程有限公司 | Wireless control lamp circuit |
| CN106486052A (en) * | 2015-08-26 | 2017-03-08 | 佛山市顺德区美的电热电器制造有限公司 | A kind of display control circuit and method and the household electrical appliance of display control are carried out using display control 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 | Display control circuit, method for performing display control by using display control circuit and household appliance |
| 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 |
| CN111511071A (en) * | 2019-01-31 | 2020-08-07 | 松下知识产权经营株式会社 | PWM signal correction method, L ED lighting device |
| CN113411932A (en) * | 2021-05-19 | 2021-09-17 | 深圳拓邦股份有限公司 | Constant-brightness LED circuit and electronic equipment |
| CN113411932B (en) * | 2021-05-19 | 2023-11-28 | 深圳拓邦股份有限公司 | Constant brightness LED circuit and electronic equipment |
| CN115734428A (en) * | 2022-12-28 | 2023-03-03 | 威海中远海运重工科技有限公司 | Constant-power stepless dimming control system |
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