CN201611973U - Stepless dimmer for LED lamp bar module - Google Patents
Stepless dimmer for LED lamp bar module Download PDFInfo
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- CN201611973U CN201611973U CN2010201444204U CN201020144420U CN201611973U CN 201611973 U CN201611973 U CN 201611973U CN 2010201444204 U CN2010201444204 U CN 2010201444204U CN 201020144420 U CN201020144420 U CN 201020144420U CN 201611973 U CN201611973 U CN 201611973U
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- timing circuit
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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 utility model belongs to the technical field of lamp dimming, and relates to a stepless dimmer for an LED lamp bar module. The input end of a power supply is electrically connected with a timing circuit and an electronic switch constant-current source respectively; the drain electrode of an FET of the electronic switch constant-current source is used as the output end of a controlled power supply; the output end of the timing circuit is electrically connected with the grid electrode of the electronic switch constant-current source; and an RC adjusting circuit for the timing circuit is electrically connected between the input end of the power supply and the timing circuit. The stepless dimmer has the advantages of large dimming range, capability of continuously dimming the light in a full-brightness 1 to 99 percent range, small appearance size, electrical energy saving, simple and convenient connection and practicability for large-range continuous dimming of an LED lamp bar and an LED module.
Description
Technical field
The utility model belongs to light fixture light regulating technology field, refers in particular to a kind of LED lamp bar module stepless dimmer.
Background technology
LED is the current drive-type device, enter the forward current of LED by control, the brightness of scalable LED, but the color of LED also produces displacement with the variation of forward current, so only be applicable to tolerance color displacement and the low-grade illuminator that resolution does not require to gray scale.
But LED more is usually used in doing display screen, be better display image, wish to regulate each the LED luminosity that constitutes pixel, the fineness of brightness regulation is just represented the height of LED display tonal gradation, the tonal gradation of display screen divides 16,32,64,128,256 at present, display screen with 256 grades of gray scales just can demonstrate the image exquisiteness, the effect of levels are rich.Even but 1 meter * 0.3 meter small display has contained 3000 LED (being pixel) that have an appointment, also just mean if each pixel need be regulated brightness and can't be realized, say nothing of the medium-sized or large display screen that contains pixel more than several ten thousand usually.
The utility model content
The purpose of this utility model provides a kind of by the time that discharges and recharges of adjusting timing circuit and then the LED lamp bar module stepless dimmer that reaches adjustment LED brightness.
The purpose of this utility model is achieved in that
LED lamp bar module stepless dimmer, the input of power supply is respectively with after timing circuit and electronic switch constant-current source are electrically connected, by the drain electrode of the FET of the electronic switch constant-current source power output end after as regulation and control, the output of timing circuit is electrically connected with the grid of the FET of electronic switch constant-current source, is electrically connected with the time adjusting circuit that discharges and recharges of timing circuit between power input and timing circuit.
The above-mentioned time adjusting circuit that discharges and recharges is: the power input positive pole connects the trigger end of timing circuit successively behind series resistance R1, potentiometer Rd, resistance R 2 and the diode D2, the discharge end of timing circuit is electrically connected with the adjustment end of potentiometer Rd, also and be in series with diode D1 between the trigger end, be in series with charge and discharge capacitance Cd between the trigger end of timing circuit and the power cathode.
The input of above-mentioned power supply is electrically connected with timing circuit and electronic switch constant-current source respectively: the input of power supply is electrically connected with the source electrode of the FET of the input of timing circuit and electronic switch constant-current source respectively, the output of timing circuit is electrically connected with the grid of the FET of electronic switch constant-current source, the positive source output of the drain electrode of the FET of electronic switch constant-current source after as regulation and control, the negative pole of power input with regulate and control after the negative pole of power output end and the negative pole of timing circuit, the negative electricity that discharges and recharges time adjusting circuit be connected.
The input voltage of the input of above-mentioned power supply is direct current 12V.
Light modulation principle of the present utility model is:
If LED is carried out the stepless dimming that reduces injection current, promptly simulate light modulation, wish again to keep original color and higher level gray scale, on principle, there is contradiction, so, must jump out former thinking constraint and introduce new concept.From Human Physiology as can be known, human eye persists reaction to vision, but persistence of vision image brilliance intercropping nonlinear attenuation at any time.Imagination adopts discontinuous power supply to LED, remains same current, voltage during switching on, so LED is in same operating state all the time, brightness, color and tonal gradation all there are not variation.But at power-off time, LED is in and extinguishes state, and (it is about 0.05～0.2S) that intermediate light stimulates, and human eye is still keeping the image that original LED lights so as long as the maximum duration that persists less than human eye vision of power-off time.If the short i.e. energising again of power-off time, persistence of vision image brilliance has decay slightly, so repeats, and that human eye perceives LED is just slightly dark.If power-off time is longer, the image mean flow rate of human eye perceives is darker so, and as if maximum duration (be persistence of vision image big decay) and then the energising of power-off time near the persistence of vision, the mean flow rate of that human eye perceives is just very dark.Said process is if the actual operation that links up promptly reaches stepless dimming.
Control analog signal by digital circuit, make the simulation light modulation be converted to PWM (PulsWidth Modulate) pulse width modulation mode and carry out stepless dimming.Utilization high-resolution counter is modulated the duty ratio of fixed frequency square wave, be equivalent to analog signal level is carried out digital coding, carry out direct current supply with pwm signal, make supply current not have size variation, and only exist the repetition pulse sequence of " having " (being " on " attitude of circuit) or " nothing " (being " off " attitude of circuit) to be added in the load, in the PWM mode, adopt the power supply of scalable duty ratio (turn-on time with cycle ratio) to be added to and just realize stepless dimming on the LED.We adopt timing circuit, and making and producing fixed frequency is f.Square wave, f.Must be greater than 100Hz, not so human eye sees that LED brightness has flicker or shake sense.Timing circuit has temporary stable state, utilizes the variation of external RC to control and discharges and recharges time length, forms the width of adjustable temporary stable state, and this width controlled signal is connected to grid as the P channel MOS type FET of electronic switch constant-current source.Power supply+12V receives the source electrode of FET, and the drain electrode of FET is given LED as the current source supply that is subjected to the PWM regulation and control, thereby reaches stepless dimming.
Relevant calculation of parameter:
1, supposes that it is f that timing circuit produces frequency
0Square wave, then square-wave cycle is:
T
0＝1÷f
0
Formula: T
0=1.44 (R1+R2+Rd) Cd----------------(1)
After the numerical value substitution (1) with R1=1k Ω, the R2=1k Ω of reality, Rd=100k Ω, Cd=0.1 μ F,
T
0≈ 1.44ms, f
0R1+R2+Rd 694Hz＞＞100Hz, so can be suitable for.
2, duty ratio formula:
d＝(R1+Ry)÷(R1+R2+Rd)
When potentiometer is adjusted to topmost, Rx=0, Ry=Rd, then
d＝101K÷102K＝0.99＝99％
When potentiometer is adjusted to bottom, Rx=Rd, Ry=0, then
d＝1K÷102K＝0.0098≈1％
So duty ratio of the present utility model can be adjusted to 99% from 1%.
The outstanding compared to existing technology advantage of the utility model is:
1, direct-current working volts 5V～16V of the present utility model, maximum operating currenbt 1.5A, dimming scope can be in 1%～99% scope of full brightness continuous light tuning;
2, little (length * wide * height=4cm * 1.4cm * 1.2cm), do not comprise the decreased food of regulator potentiometer can directly be series between power supply and the LED and use overall dimension of the present utility model;
3, maximum efficiency of the present utility model be when from high light to the darkest time institute's current drain reduce 80% approximately, this proves that fully this light modulating device is the energy-saving type light modulation, the electric energy of brightness consumption that deepening reduces changed the heat that is produced after the variable resistor step-down fully into when doing the step-down light modulation unlike former application variable resistor, caused energy dissipation.
4, wiring of the present utility model is simple and convenient, is applicable to the large-scale continuous light tuning to LED lamp bar, LED module.
Description of drawings
Fig. 1 is a circuit block diagram of the present utility model;
When Fig. 2 is the utility model stepless dimming, the variation schematic diagram of duty ratio d.
Embodiment
With specific embodiment the utility model is further described below, referring to Fig. 1:
LED lamp bar module stepless dimmer 1, the input 5 of power supply is respectively with after timing circuit 3 and electronic switch constant-current source 2 are electrically connected, can external LED lamp bar or LED module by the drain D end of the FET of electronic switch constant-current source 2 power output end 6 after as regulation and control, the output of timing circuit 3 is electrically connected with the grid G end of the FET of electronic switch constant-current source 2, and what be electrically connected with timing circuit between power input 5 and timing circuit 3 discharges and recharges time adjusting circuit 4.
The above-mentioned time adjusting circuit 4 that discharges and recharges is: the power input positive pole connects the trigger end 13 of timing circuit 3 successively behind series resistance R1, potentiometer Rd, resistance R 2 and the diode D2, the discharge end 12 of timing circuit 3 is electrically connected with the adjustment end 16 of potentiometer Rd, between the discharge end 12 of timing circuit 3 and trigger end 13, be in series with diode D1, be in series with charge and discharge capacitance Cd between the trigger end 13 of timing circuit 3 and the power cathode, diode D1 is a forward by discharge end 12 to the direction of trigger end 13, and diode D2 is a positive direction by trigger end 13 to the direction of resistance R 2.
The input 5 of above-mentioned power supply is electrically connected with timing circuit 3 and electronic switch constant-current source 2 respectively: the input 5 of power supply is electrically connected with the source S of the FET of the input of timing circuit 3 and electronic switch constant-current source 2 respectively, the output 15 of timing circuit 3 is electrically connected with the grid G end of the FET of electronic switch constant-current source 2, the positive source output of the drain D end of the FET of electronic switch constant-current source 2 after as regulation and control, the negative pole of power input 5 with regulate and control after the negative pole of power output end 6 and the negative pole of timing circuit 3, the negative electricity that discharges and recharges time adjusting circuit 4 be connected.
The input voltage of the input of above-mentioned power supply is direct current 12V.
Application of the present utility model: the D end of LED lamp bar module stepless dimmer 2 of the present utility model is electrically connected as the input of power output end 6 with LED display 7, because of limit by power supply, only select the small size display screen for use, when brightness is dimmed gradually from the brightest, though can see brightness deepening gradually, but the color of display screen does not feel that significant change is arranged, though and brightness dark, show levels is still clear and legible.
The foregoing description only is one of preferred embodiment of the present utility model; be not to limit protection range of the present utility model according to this; so: all equivalences of doing according to structure of the present utility model, shape, principle change, and all should be covered by within the protection range of the present utility model.
Claims (4)
1.LED lamp bar module stepless dimmer, it is characterized in that: the input of power supply is respectively with after timing circuit and electronic switch constant-current source are electrically connected, by the drain electrode of the FET of the electronic switch constant-current source power output end after as regulation and control, the output of timing circuit is electrically connected with the grid of electronic switch constant-current source, and circuit discharges and recharges time adjusting circuit when being electrically connected with adjustable adjusting between power input and timing circuit.
2. LED lamp bar module stepless dimmer according to claim 1, it is characterized in that: the described time adjusting circuit that discharges and recharges is: the power input positive pole connects the trigger end of timing circuit successively behind series resistance R1, potentiometer Rd, resistance R 2 and the diode D2, the discharge end of timing circuit is electrically connected with adjustment end and the D1 of potentiometer Rd, is in series with charge and discharge capacitance Cd between the trigger end of timing circuit and the power cathode.
3. LED lamp bar module stepless dimmer according to claim 1, it is characterized in that: the input of described power supply is electrically connected with timing circuit and electronic switch constant-current source respectively and is: the input of power supply is electrically connected with the source electrode of the FET of the input of timing circuit and electronic switch constant-current source respectively, the output of timing circuit is electrically connected with the grid of the FET of electronic switch constant-current source, the negative pole of power output end behind the positive source output of the drain electrode of the FET of electronic switch constant-current source after, the negative pole of power input and regulation and control and the negative pole of timing circuit as regulation and control, the negative electricity that discharges and recharges time adjusting circuit connects.
4. LED lamp bar module stepless dimmer according to claim 1 and 2, it is characterized in that: the input voltage of the input of described power supply is direct current 12V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201444204U CN201611973U (en) | 2010-03-26 | 2010-03-26 | Stepless dimmer for LED lamp bar module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201444204U CN201611973U (en) | 2010-03-26 | 2010-03-26 | Stepless dimmer for LED lamp bar module |
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| Publication Number | Publication Date |
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| CN201611973U true CN201611973U (en) | 2010-10-20 |
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| CN2010201444204U Expired - Fee Related CN201611973U (en) | 2010-03-26 | 2010-03-26 | Stepless dimmer for LED lamp bar module |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102685975A (en) * | 2011-03-07 | 2012-09-19 | 凹凸电子（武汉）有限公司 | Controllers, systems and methods for controlling dimming of light sources |
| CN102695319A (en) * | 2011-03-23 | 2012-09-26 | 海洋王照明科技股份有限公司 | LED stepless light regulating circuit |
| US8698419B2 (en) | 2010-03-04 | 2014-04-15 | O2Micro, Inc. | Circuits and methods for driving light sources |
| US8866398B2 (en) | 2012-05-11 | 2014-10-21 | O2Micro, Inc. | Circuits and methods for driving light sources |
| US9030122B2 (en) | 2008-12-12 | 2015-05-12 | O2Micro, Inc. | Circuits and methods for driving LED light sources |
| US9232591B2 (en) | 2008-12-12 | 2016-01-05 | O2Micro Inc. | Circuits and methods for driving light sources |
| US9253843B2 (en) | 2008-12-12 | 2016-02-02 | 02Micro Inc | Driving circuit with dimming controller for driving light sources |
| US9386653B2 (en) | 2008-12-12 | 2016-07-05 | O2Micro Inc | Circuits and methods for driving light sources |
-
2010
- 2010-03-26 CN CN2010201444204U patent/CN201611973U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9030122B2 (en) | 2008-12-12 | 2015-05-12 | O2Micro, Inc. | Circuits and methods for driving LED light sources |
| US9232591B2 (en) | 2008-12-12 | 2016-01-05 | O2Micro Inc. | Circuits and methods for driving light sources |
| US9253843B2 (en) | 2008-12-12 | 2016-02-02 | 02Micro Inc | Driving circuit with dimming controller for driving light sources |
| US9386653B2 (en) | 2008-12-12 | 2016-07-05 | O2Micro Inc | Circuits and methods for driving light sources |
| US8698419B2 (en) | 2010-03-04 | 2014-04-15 | O2Micro, Inc. | Circuits and methods for driving light sources |
| CN102685975A (en) * | 2011-03-07 | 2012-09-19 | 凹凸电子（武汉）有限公司 | Controllers, systems and methods for controlling dimming of light sources |
| CN102695319A (en) * | 2011-03-23 | 2012-09-26 | 海洋王照明科技股份有限公司 | LED stepless light regulating circuit |
| CN102695319B (en) * | 2011-03-23 | 2014-12-17 | 海洋王照明科技股份有限公司 | LED stepless light regulating circuit |
| US8866398B2 (en) | 2012-05-11 | 2014-10-21 | O2Micro, Inc. | Circuits and methods for driving light sources |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Zhejiang Yabao Optoelectronics Technology Co., Ltd. Assignor: Zhejiang Yabao Optoelectronics Technology Co., Ltd| Chen Yunjun Contract record no.: 2012330000475 Denomination of utility model: Stepless dimmer for LED lamp bar module Granted publication date: 20101020 License type: Exclusive License Record date: 20120827 |
|
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101020 Termination date: 20130326 |