CN101765273B - Stepless dimming LED drive circuit - Google Patents
Stepless dimming LED drive circuit Download PDFInfo
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- CN101765273B CN101765273B CN 201010101542 CN201010101542A CN101765273B CN 101765273 B CN101765273 B CN 101765273B CN 201010101542 CN201010101542 CN 201010101542 CN 201010101542 A CN201010101542 A CN 201010101542A CN 101765273 B CN101765273 B CN 101765273B
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Abstract
The invention relates to a stepless dimming LED drive circuit, comprising a power supply input unit, a voltage stabilization unit, a PWM control unit and a constant current drive unit, wherein the power supply input unit is used for rectifying, filtering and outputting input signals as well as supplying power for an LED component; the voltage stabilization unit is connected with the output end of the power supply input unit, and is used for outputting stable voltage; the PWM control unit is connected with the output end of the voltage stabilization unit, and is used for outputting PWM waves and regulating the duty cycle and/or the frequency of the PWM waves; and the constant current drive unit is connected with the output end of the PWM control unit, and is used for receiving the PWM waves to constant current drive the LED component. The invention is suitable for wide voltage input, simultaneously can regulate different output current ranges to satisfy different numbers of LEDs, and thereby meeting different illumination requirements.
Description
Technical field
The present invention relates to a kind of led drive circuit, more particularly, relate to a kind of stepless dimming LED drive circuit.
Background technology
Stepless dimming refers to lamp luminescence power is carried out continuous adjusting.LED is carried out stepless dimming will be with a wide range of applications.
Yet existing Zooming light modulation circuit is applicable to the less power supply signal of input voltage range mostly.If input voltage range is excessive, then can the normal operation of circuit be exerted an influence.On the other hand, existing Zooming light modulation circuit only can be regulated the LED lamp of fixed number.When changing the number of LED lamp, the drive current that then needs to regulate LED is to suitable scope, and existing stepless dimming LED drive circuit is difficult to realize this function.
Summary of the invention
The technical problem to be solved in the present invention is, for the little and immutable defective of load LED quantity of above-mentioned input voltage range of existing stepless dimming LED circuit, provides a kind of wide voltage input and the adjustable stepless dimming LED drive circuit of output current scope.
The technical solution adopted for the present invention to solve the technical problems is: construct a kind of stepless dimming LED drive circuit, comprising:
Power input unit is used for input signal is carried out rectifying and wave-filtering and is output as the LED assembly power supply;
Voltage regulation unit links to each other with described power input unit output, is used for stable output voltage;
The PWM control unit links to each other with described voltage regulation unit output, is used for output PWM ripple and regulates its duty ratio and/or frequency;
Constant current driving unit links to each other with described PWM control unit output, is used for receiving PWM ripple constant-current driving LED assembly.
In stepless dimming LED drive circuit of the present invention, described voltage regulation unit comprises the voltage stabilizing chip, and the input of described voltage stabilizing chip is connected to the input of voltage regulation unit by the first resistance, and the output of voltage stabilizing chip is as the output of voltage regulation unit.
In stepless dimming LED drive circuit of the present invention, described PWM control unit comprises pwm chip at least, and the first slide rheostat and the second slide rheostat; The reset terminal of described pwm chip links to each other with the input of working power end with the PWM control unit; And the input of PWM control unit links to each other with the first stiff end with the sliding end of the first slide rheostat, the second stiff end of the first slide rheostat is connected to the discharge end of pwm chip and links to each other with the first stiff end of the second slide rheostat simultaneously, the second stiff end of the second slide rheostat links to each other with the anode of the first diode, and the negative electrode of the 5th diode links to each other with the second stiff end of the first slide rheostat; The triggering input of described pwm chip links together with the threshold value input and links to each other with the sliding end of the second slide rheostat, and the sliding end of the second slide rheostat is by the first capacity earth; The counting end of pwm chip is by the second capacity earth; The output of pwm chip links to each other with the base stage of triode by the second resistance, and the grounded emitter of triode, and collector electrode is as the output of PWM control unit.
Implement stepless dimming LED drive circuit of the present invention, have following beneficial effect: the present invention can be applicable to the input of wide voltage, and can arbitrarily regulate different output current scopes satisfying the LED of different numbers, thereby is applicable to different lighting requirements.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the module diagram of stepless dimming LED drive circuit in the preferred embodiment of the present invention;
Fig. 2 is the circuit theory diagrams of stepless dimming LED drive circuit in the preferred embodiment of the present invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.
See also Fig. 1, be the module diagram of stepless dimming LED drive circuit in the preferred embodiment of the present invention.As shown in Figure 1, the invention provides a kind of stepless dimming LED drive circuit, comprise power input unit 100, voltage regulation unit 200, PWM control unit 300 and constant current driving unit 400.Wherein, power input unit 100 is used for input signal is carried out rectifying and wave-filtering and is output as 500 power supplies of LED assembly.The input of voltage regulation unit 200 links to each other with power input unit 100 outputs, is used for stable output voltage.The input of PWM control unit 300 links to each other with voltage regulation unit 200 outputs, is used for output PWM ripple and regulates its duty ratio and/or frequency.The input of constant current driving unit 400 links to each other with the output of PWM control unit 300, is used for receiving PWM ripple constant-current driving LED assembly 500.Just can realize wide voltage input signal voltage stabilizing is worked with protective circuit by above-mentioned voltage regulation unit 200.
See also Fig. 2, be the circuit theory diagrams of stepless dimming LED drive circuit in the preferred embodiment of the present invention.The below is realized by the physical circuit of each unit among the present invention and principle is described.
At first, 100 pairs of input signals of power input unit carry out rectification and filtering.It comprises the first inductance L 1, the second inductance L 2 and rectifier bridge (D1, D2, D3, D4) at least.Wherein, the positive input terminal of power input unit 100 links to each other with an input of rectifier bridge by the first inductance L 1, the negative input end of power input unit 100 links to each other with another input of rectifier bridge by the second inductance L 2, and be connected with the 4th capacitor C 2 between two inputs of rectifier bridge, the output of rectifier bridge is by the 5th capacitor C 3 and the 6th capacitor C 4 ground connection, and the output of rectifier bridge is as the output of power input unit 100.
The voltage regulation unit 200 main three-terminal voltage-stabilizing chip U1 that adopt.In the present embodiment, the input VIN of voltage stabilizing chip U1 connects the output of power input unit 100 by the first resistance R 1.The output VOUT of voltage stabilizing chip U1 links to each other with the input of PWM control unit 300 as the output of voltage regulation unit 200.
The PWM control unit 300 main pwm chip U3 that adopt.In the present embodiment, this pwm chip U3 adopts 555 timer chips to realize its function.And realize adjusting to output PWM ripple duty ratio and frequency, i.e. the first slide rheostat R5 and the second slide rheostat R4 by 2 slide rheostats.The reset terminal RST of pwm chip U3 links to each other with the output of voltage regulation unit 200 with working power end VCC.And the output of voltage regulation unit 200 also links to each other with the first stiff end with the sliding end of the first slide rheostat R5, and the second stiff end of the first slide rheostat R5 is connected to the discharge end DIS of pwm chip U3 and links to each other with the first stiff end of the second slide rheostat R4 simultaneously.The second stiff end of the second slide rheostat R4 links to each other with the anode of the first diode D5, and the negative electrode of the 5th diode D5 links to each other with the second stiff end of the first slide rheostat R5.The triggering input TRI of pwm chip U3 links together with threshold value input THR and links to each other with the sliding end of the second slide rheostat R4, and the sliding end of the second slide rheostat R4 is by the first capacitor C 6 ground connection.The counting end CON of pwm chip U3 is by the second capacitor C 7 ground connection; The output OUT of pwm chip U3 links to each other with the base stage of triode Q1 by the second resistance R 6, and the grounded emitter of triode Q1, and collector electrode links to each other with the input of described constant current driving unit 400 as the output of PWM control unit 300.By the operating characteristic of 555 timer chips as can be known, when regulating the resistance of the first slide rheostat R5 and the second slide rheostat R4, the frequency of oscillation of timer changes, and the PWM wave frequency of output is along with changing; Can regulate by the resistance of regulating the first slide rheostat R5 and the second slide rheostat R4 simultaneously the control voltage of 555 timer chips, thus the duty ratio of regulation output PWM ripple.
Constant current driving unit 400 comprises constant current chip U2 and field effect transistor Q2 at least.In the present embodiment, the chip model of constant current chip U2 employing is SMD802.The input supply terminal VIN of constant current chip U2 links to each other with the anode of LED assembly 500, and the PWM input PWM of constant current chip U2 links to each other with the collector electrode of triode Q1; The internal electric source output VDD of constant current chip U2 links to each other with linearity light adjusting input LD, and by the 3rd capacitor C 5 ground connection; The vibration input ROSC of constant current chip U2 is by the 3rd resistance R 3 ground connection; The gate terminals GATE of constant current chip U2 links to each other with current detecting end CS and also is connected to simultaneously source electrode and the grid of field effect transistor Q2, and the source electrode of field effect transistor Q2 is by the 4th resistance R 2 ground connection; The drain electrode of field effect transistor Q2 is connected to the negative electrode of LED assembly 500 by the 3rd inductance L 3; And the drain electrode of field effect transistor Q2 is connected to the anode of voltage stabilizing didoe D6, and the negative electrode of voltage stabilizing didoe D6 links to each other with the anode of LED assembly 500.In the present embodiment, LED assembly 500 is provided with 6 LED, i.e. LED1 to LED6.Drive circuit of the present invention can change by the resistance of regulating the 4th resistance R 2 the maximum current scope of LED assembly, therefore goes for having the LED assembly of different LED number.
Constant current chip U2 is the PWM generator that the SMD802 conduct is subjected to the control of output current peak value, and its gate terminals GATE directly drives external N channel field-effect pipe Q2.When gate terminals GATE output high level, field effect transistor Q2 conducting, the signal of telecommunication of power input unit 100 outputs output forms current circuit through LED assembly 500, the 3rd inductance L 3, field effect transistor Q2, the 4th resistance R 2, and LED assembly 500 is luminous.Because the existence of the 3rd inductance L 3, electric current is to rise on the slope, and in the 3rd inductance L 3 storage power.When the voltage on the 4th resistance R 2 rises to certain value, this voltage is input to the in-phase end of comparator among the constant current chip U2 through blanking circuit, the anti-phase termination reference voltage of comparator, comparator output high level, the input of this high level or door make or door output high level, make among the constant current chip U2 rest-set flip-flop reset output low level and input and door, make gate terminals GATE output low level, then field effect transistor Q2 cut-off.During being on the scene effect pipe Q2 cut-off, the 3rd inductance L 3 discharges the energy that stores, and the inductive current of generation forms the loop through voltage stabilizing didoe D6, LED assembly 500, and LED assembly 500 electric currents bright and wherein LED are continuous.
In sum, the present invention can arrange according to different demands the resistance of the 4th resistance R 2, to regulate different output current scopes to satisfy the LED of different numbers; Regulate simultaneously duty ratio and the frequency of PWM ripple by the resistance of regulating the first slide rheostat R5 and the second slide rheostat R4, thereby realize stepless dimming.
The present invention is described according to specific embodiment, but it will be understood by those skilled in the art that when not breaking away from the scope of the invention, can carry out various variations and be equal to replacement.In addition, for adapting to specific occasion or the material of the technology of the present invention, can carry out many modifications and not break away from its protection range the present invention.Therefore, the present invention is not limited to specific embodiment disclosed herein, and comprises that all drop into the embodiment of claim protection range.
Claims (3)
1. a stepless dimming LED drive circuit is characterized in that, comprising:
Power input unit (100) is used for input signal is carried out rectifying and wave-filtering and is output as LED assembly (500) power supply;
Voltage regulation unit (200) links to each other with described power input unit (100) output, is used for stable output voltage;
PWM control unit (300) links to each other with described voltage regulation unit (200) output, is used for output PWM ripple and regulates its duty ratio and/or frequency;
Constant current driving unit (400) links to each other with described PWM control unit (300) output, is used for receiving PWM ripple constant-current driving LED assembly (500);
Described PWM control unit (300) comprises pwm chip (U3) at least, and the first slide rheostat (R5) and the second slide rheostat (R4); The reset terminal (RST) of described pwm chip (U3) links to each other with the output of working power end (VCC) with described voltage regulation unit (200); And the output of described voltage regulation unit (200) also links to each other with the first stiff end with the sliding end of the first slide rheostat (R5), the second stiff end of the first slide rheostat (R5) is connected to the discharge end (DIS) of pwm chip (U3) and links to each other with the first stiff end of the second slide rheostat (R4) simultaneously, the second stiff end of the second slide rheostat (R4) links to each other with the anode of the first diode (D5), and the negative electrode of the first diode (D5) links to each other with the second stiff end of the first slide rheostat (R5); The triggering input (TRI) of described pwm chip (U3) links together with threshold value input (THR) and links to each other with the sliding end of the second slide rheostat (R4), and the sliding end of the second slide rheostat (R4) is by the first electric capacity (C6) ground connection; The counting end (CON) of pwm chip (U3) is by the second electric capacity (C7) ground connection; The output (OUT) of pwm chip (U3) links to each other with the base stage of triode (Q1) by the second resistance (R6), and the grounded emitter of triode (Q1), collector electrode links to each other with the input of described constant current driving unit (400) as the output of PWM control unit (300);
Described constant current driving unit (400) comprises constant current chip (U2) and field effect transistor (Q2) at least; The input supply terminal (VIN) of described constant current chip (U2) links to each other with the anode of LED assembly (500), and the PWM input (PWM) of constant current chip (U2) links to each other with the collector electrode of triode (Q1); The internal electric source output (VDD) of constant current chip (U2) links to each other with linearity light adjusting input (LD), and by the 3rd electric capacity (C5) ground connection; The vibration input (ROSC) of constant current chip (U2) is by the 3rd resistance (R3) ground connection; The gate terminals (GATE) of constant current chip (U2) links to each other with current detecting end (CS) and also is connected to simultaneously source electrode and the grid of field effect transistor (Q2), and the source electrode of field effect transistor (Q2) is by the 4th resistance (R2) ground connection; The drain electrode of field effect transistor (Q2) is connected to the negative electrode of LED assembly (500) by the 3rd inductance (L3); And the drain electrode of field effect transistor (Q2) is connected to the anode of voltage stabilizing didoe (D6), and the negative electrode of voltage stabilizing didoe (D6) links to each other with the anode of LED assembly (500).
2. stepless dimming LED drive circuit according to claim 1, it is characterized in that, described voltage regulation unit (200) comprises voltage stabilizing chip (U1), the input (VIN) of described voltage stabilizing chip (U1) is connected to the output of power input unit (100) by the first resistance (R1), the output (VOUT) of voltage stabilizing chip (U1) links to each other with the input of PWM control unit (300) as the output of voltage regulation unit (200).
3. stepless dimming LED drive circuit according to claim 1 and 2, it is characterized in that, described power input unit (100) comprises the first inductance (L1) at least, the second inductance (L2) and rectifier bridge, the positive input terminal of power input unit (100) links to each other with an input of rectifier bridge by the first inductance (L1), the negative input end of power input unit (100) links to each other with another input of rectifier bridge by the second inductance (L2), and be connected with the 4th electric capacity (C2) between two inputs of rectifier bridge, the output of rectifier bridge is by the 5th electric capacity (C3) and the 6th electric capacity (C4) ground connection, and the output of rectifier bridge is as the output of power input unit (100).
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| CN 201010101542 CN101765273B (en) | 2010-01-22 | 2010-01-22 | Stepless dimming LED drive circuit |
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| CN 201010101542 CN101765273B (en) | 2010-01-22 | 2010-01-22 | Stepless dimming LED drive circuit |
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| CN101765273A CN101765273A (en) | 2010-06-30 |
| CN101765273B true CN101765273B (en) | 2013-03-27 |
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| CN 201010101542 Expired - Fee Related CN101765273B (en) | 2010-01-22 | 2010-01-22 | Stepless dimming LED drive circuit |
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Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101959348B (en) * | 2010-09-30 | 2013-11-06 | 海洋王照明科技股份有限公司 | LED stepless dimming drive circuit and LED lamp |
| CN102548093A (en) * | 2010-12-21 | 2012-07-04 | 海洋王照明科技股份有限公司 | Direct-current light emitting diode (LED) constant-current driving circuit and LED lamp |
| TW201236500A (en) * | 2011-02-24 | 2012-09-01 | Hanergy Technologies Inc | LED driver circuit |
| TW201236506A (en) * | 2011-02-24 | 2012-09-01 | Hanergy Technologies Inc | LED driver circuit |
| CN102740529A (en) * | 2011-04-01 | 2012-10-17 | 科域半导体有限公司 | Led drive circuit |
| CN102185549B (en) * | 2011-04-14 | 2012-06-20 | 江苏浩峰汽车附件有限公司 | Multifunctional speed-regulation and light-modulation PWM (Pulse-Width Modulation) controller |
| CN103118453A (en) * | 2011-11-16 | 2013-05-22 | 金德奎 | Light emitting diode (LED) tandem driving control circuit based on microcontroller and programming method of microcontroller |
| CN103167672B (en) * | 2011-12-09 | 2017-04-19 | 金德奎 | Light-emitting diode (LED) illumination power supply and drive control system |
| CN102523653A (en) * | 2011-12-20 | 2012-06-27 | 江苏飞格光电有限公司 | Controllable LED current source circuit |
| CN104780695B (en) * | 2015-05-05 | 2018-03-02 | 厦门亚锝电子科技有限公司 | A kind of LED non-pole light regulatings constant-current driving power supply |
| CN105704855A (en) * | 2016-01-04 | 2016-06-22 | 京东方光科技有限公司 | Induction lamp and driving method thereof |
| CN106163014A (en) * | 2016-08-31 | 2016-11-23 | 周鸿德 | LED with inductance step-down |
| CN107592707A (en) * | 2017-10-20 | 2018-01-16 | 广州佰艺精工有限公司 | Multi-colored led device and multi-color LED light source |
| TWI734324B (en) * | 2019-05-28 | 2021-07-21 | 聚眾聯合科技股份有限公司 | Light source adjustment system |
| CN114034888A (en) * | 2021-09-29 | 2022-02-11 | 苏州达亚电子有限公司 | Double-needle type photosensitive resistor detection device |
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| CN101227779A (en) * | 2008-01-29 | 2008-07-23 | 电子科技大学 | Insulation type general use illumination LED driving circuit |
| CN101404842A (en) * | 2008-10-15 | 2009-04-08 | 江阴旺达电子有限公司 | Three-wire system high-power LED driver |
| CN101534587A (en) * | 2009-03-27 | 2009-09-16 | 陕西科技大学 | Commercial power LED constant current driver |
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- 2010-01-22 CN CN 201010101542 patent/CN101765273B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101227779A (en) * | 2008-01-29 | 2008-07-23 | 电子科技大学 | Insulation type general use illumination LED driving circuit |
| CN101404842A (en) * | 2008-10-15 | 2009-04-08 | 江阴旺达电子有限公司 | Three-wire system high-power LED driver |
| CN101534587A (en) * | 2009-03-27 | 2009-09-16 | 陕西科技大学 | Commercial power LED constant current driver |
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