CN106028511B - A kind of LED stepless dimmings system - Google Patents
A kind of LED stepless dimmings system Download PDFInfo
- Publication number
- CN106028511B CN106028511B CN201610369781.0A CN201610369781A CN106028511B CN 106028511 B CN106028511 B CN 106028511B CN 201610369781 A CN201610369781 A CN 201610369781A CN 106028511 B CN106028511 B CN 106028511B
- Authority
- CN
- China
- Prior art keywords
- input
- coupled
- output end
- circuit
- light adjusting
- 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
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/10—Controlling the intensity of the light
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention discloses a kind of LED stepless dimmings system, including：Light adjusting circuit is treated, and for the adjusting control circuit treated light adjusting circuit and dimmed；The adjusting control circuit includes：Input is coupled in initial adjustment voltage, the dimming curve circuit for producing dimming curve；First input end is coupled in the dimming curve circuit output end, and the second input is coupled in the error amplifier of light modulation detection signal；Input is coupled in error amplifier output, and output end is coupled in the PWM control modules of switching tube；The PWM control modules treat that light adjusting circuit carries out brightness adjustment control by adjusting dutycycle, to described.The present invention can improve dimming effect.
Description
Technical field
The present invention relates to a kind of LED technology field, more particularly to a kind of LED stepless dimmings system.
Background technology
In current LED illumination controllable silicon light modulation control chip field, LED lamp bead brightness is as light modulation angle is from mostly small
Situation of change, it is a very important design parameter, is typically stated with dimming curve.The shape of dimming curve determines people
Sense of reality of the eye vision for thyristor regulating light effect.
Existing dimming curve is usually relatively simple straight line, segmented matched curve etc.；Such dimming curve makes
Obtaining and usually occur the change such as lofty brightness in dimming process, human eye vision is felt to be deteriorated, and influences the smoothness dimmed, and one
Cause property and robustness are deteriorated, and cause human eye to feel not soft.
It should be noted that the introduction to technical background above be intended merely to the convenient technical scheme to the application carry out it is clear,
Complete explanation, and facilitate the understanding of those skilled in the art and illustrate.Can not merely because these schemes the application's
Background section is set forth and thinks that above-mentioned technical proposal is known to those skilled in the art.
The content of the invention
In view of the drawbacks described above of prior art, the technical problems to be solved by the invention, which are to provide, enables to light modulation to imitate
The stepless dimming system that fruit improves.
To achieve the above object, the invention provides a kind of LED stepless dimmings system, including：
Light adjusting circuit is treated, and for the adjusting control circuit treated light adjusting circuit and dimmed；
The adjusting control circuit includes：
Input is coupled in initial adjustment voltage, the dimming curve circuit for producing natural logrithm dimming curve；
First input end is coupled in the dimming curve circuit output end, and the second input is coupled in light modulation detection signal
Error amplifier；
Input is coupled in error amplifier output, and output end is coupled in the PWM control modules of switching tube；
The PWM control modules treat that light adjusting circuit carries out brightness adjustment control by adjusting dutycycle, to described.
Further, the dimming curve circuit includes dimming curve generation module, the dimming curve generation module
Input is coupled respectively to input signal S and benchmark variable X, and the output end of the dimming curve generation module passes through PWM
Modulation module is coupled in the error amplifier.The control of dimming curve is carried out by input signal S and benchmark variable X,
Exemplified by turning down brightness, in the case of LED high brightness, brightness decrease speed is fast, in low-light level, then can control down
Reduction of speed degree is slow, so, human eye seem brightness change will smooth uniform it is many, dimming effect improves.
Further, the dimming curve generation module includes dimming curve radian controller, saw-toothed wave generator and ratio
Compared with device；
The input of the dimming curve radian controller is coupled in the input signal S, and output signal 6+S is exported
To the saw-toothed wave generator；
The saw-toothed wave generator carries out logarithm sawtooth waveforms computing to the output signal, obtains a cycle is T oneself
Right logarithm sawtooth waveforms ln (6+S)-ln (6+S-6t/T), and the natural logrithm sawtooth waveforms is output to the first of the comparator
Input；
Second input of the comparator is coupled in the benchmark variable X, and the comparator is according to the nature
Logarithm sawtooth waveforms and benchmark variable X relatively obtain dimming curve：
And the dimming curve is output to the input of the PWM module.The benchmark variable X be mainly used in substitute or
The brightness of LED is represented, X value can take 0 to 1, wherein 1 represents high-high brightness, and 0 represents minimum brightness, according to circumstances
It can be varied from；And S then value 0.5≤S≤2,；The dimming curve generation module becomes according to input signal S and benchmark
X is measured, dimming curve is obtained, the adjustment voltage for adjusting to obtain by the dimming curve, this can be caused to treat the brightness of light adjusting circuit
Change is smooth, is comfortable on human eye and soft, and dimming effect is further enhanced.
Further, the first input end of the PWM module is used to receive the dimming curve, and the second input is then
It is coupled in initial adjustment voltage；
The PWM module is used for institute according to the dimming curve and initial adjustment voltage, modulation output adjustment voltage
State the light modulation for treating light adjusting circuit.The initial adjustment voltage is pre-set, and is obtained according to the situation for treating light adjusting circuit；The tune
Light curve generation module obtains dimming curve, adjusted by the dimming curve, incited somebody to action according to input signal S and benchmark variable X
Initial adjustment voltage optimizes adjustment and is adjusted voltage, and the adjustment voltage after optimization is used for the light modulation for treating light adjusting circuit,
This can be caused to treat that the brightness of light adjusting circuit change is smooth, be comfortable on human eye and soft, dimming effect is further increased
By force.
Further, the output end of the PWM module is also coupled with a wave filter.It is miscellaneous that wave filter removes signal
Matter, signal interference is avoided, be advantageous to the raising of dimming effect.
Further, the stepless dimming system also includes being used for the power supply for treating light adjusting circuit power supply；The tune
Light control circuit also includes switching tube；
The control terminal of the switching tube is coupled in the PWM control modules output end, and input, which is coupled in, described to be waited to dim
Circuit output end, output end are coupled respectively to the negative pole of earth terminal and the power supply by the divider resistance；
Second input of the error amplifier is coupled between the switching tube output end and divider resistance, for adopting
Collection light modulation detection signal.The input of slowdown monitoring circuit to be checked is connected to positive source, output end by switching tube, via partial pressure electricity
Resistance, is coupled respectively to power cathode and earth terminal；In this way, by the detection to divider resistance, it can indirectly detect this and wait to adjust
The circuit conditions of optical circuit, and then cause the adjusting control circuit can be with the adjustment voltage of output matching to carry out treating light adjusting circuit
Light modulation.
Further, the adjusting control circuit also includes a filter capacitor, and one end of the filter capacitor is coupling in institute
State between error amplifier and PWM control modules, other end ground connection.Filter capacitor removes signal impurity, reduces signal interference, right
It is helpful to improve dimming effect.
Further, it is described to treat that light adjusting circuit is coupled between positive source and power cathode, it is described to treat light adjusting circuit bag
Include：
The LED treated between light adjusting circuit input and output end is connected to,
The output filter capacitor being connected between the LED input and output end,
It is coupled in the LED output end and treats the fly-wheel diode between light adjusting circuit output end,
It is coupled in the LED input and treats the power inductance between light adjusting circuit output end.Buck-boost type altogether
The examples of circuits connection power supply of LED lamp bead is direct current, refers to the ground of controller altogether with systematically identical, with floating relative
Should；Buck-boost type is a kind of topological structure, the entitled Buckboost of English, this topological structure allow output voltage be less than or
Higher than input voltage, with buck topology (buck, output voltage are less than input voltage) and booster type topology (boost, output electricity
Pressure is higher than input voltage) it is corresponding；Certainly, the solution of the present invention is not limited only to this circuit, is only for example herein；In this circuit,
When switching tube is opened, power inductance charging；When switching tube is closed, power inductance and fly-wheel diode coordinate afterflow, and LED is entered
Row power supply, and control constant current；The effect of divider resistance mainly when switching tube is opened, power inductance charges, carries out waiting to dim
The detection of circuit, and then during by the way that electric discharge is calculated, this treats the circuit conditions of light adjusting circuit.
Further, the stepless dimming system also includes being used for the power supply for treating light adjusting circuit power supply；The tune
Light control circuit also includes switching tube；
The control terminal of the switching tube is coupled in the PWM control modules output end, and input is coupled in positive source, defeated
Go out end and the input for treating light adjusting circuit is coupled respectively to by divider resistance；
Second input of the error amplifier is coupled between the switching tube output end and divider resistance, for adopting
Collection light modulation detection signal；
It is described to treat that light adjusting circuit is coupled between divider resistance and power cathode, it is described to treat that light adjusting circuit includes：
The power inductance and output filter capacitor treated between light adjusting circuit input and output end is series at,
The fly-wheel diode treated between light adjusting circuit input and output end is connected to,
It is parallel to the LED of the output filter capacitor.The examples of circuits connection of the buck-boost type LED on floating ground, together
The buck-boost type LED lamp circuit connection on ground is corresponding.
The present invention can produce the dimming curve circuit of natural logrithm dimming curve due to adding, because natural logrithm is adjusted
Light curve avoids straight line dimming curve, segmented is fitted dimming curve brightness during dimming curve and changes lofty, light modulation
The problem of smoothness, uniformity and robustness are deteriorated；Brightness change is not smooth lofty so that human eye vision is comfortable on and soft
With.
With reference to following explanation and accompanying drawing, the particular implementation of the application is disclose in detail, specifies the original of the application
Reason can be in a manner of adopted.It should be understood that presently filed embodiment is not so limited in scope.In appended power
In the range of the spirit and terms that profit requires, presently filed embodiment includes many changes, modifications and is equal.
The feature for describing and/or showing for a kind of embodiment can be in a manner of same or similar one or more
Used in individual other embodiment, it is combined with the feature in other embodiment, or substitute the feature in other embodiment.
It should be emphasized that term "comprises/comprising" refers to the presence of feature, one integral piece, step or component when being used herein, but simultaneously
It is not excluded for the presence or additional of one or more further features, one integral piece, step or component.
Brief description of the drawings
Included accompanying drawing is used for providing being further understood from the embodiment of the present application, which constitutes one of specification
Point, for illustrating presently filed embodiment, and come together with word description to explain the principle of the application.Under it should be evident that
Accompanying drawing in the description of face is only some embodiments of the present application, for those of ordinary skill in the art, is not paying wound
On the premise of the property made is laborious, other accompanying drawings can also be obtained according to these accompanying drawings.In the accompanying drawings：
Fig. 1 is the dimming curve schematic diagram of the first prior art；
Fig. 2 is the schematic diagram of light modulation rate curve corresponding to the first prior art；
Fig. 3 is the schematic diagram of light modulation smoothness curve corresponding to the first prior art；
Fig. 4 is the dimming curve schematic diagram of second of prior art；
Fig. 5 is the schematic diagram of light modulation rate curve corresponding to second of prior art；
Fig. 6 is the schematic diagram of light modulation smoothness curve corresponding to second of prior art；
Fig. 7 is the dimming curve schematic diagram of the third prior art；
Fig. 8 is the schematic diagram of light modulation rate curve corresponding to the third prior art；
Fig. 9 is the schematic diagram of light modulation smoothness curve corresponding to the third prior art；
Figure 10 is a kind of schematic diagram of LED stepless dimmings system of the present invention；
Figure 11 is the schematic diagram of the dimming curve circuit of the present invention；
Figure 12 is the dimming curve schematic diagram of the present invention；
Figure 13 is the schematic diagram of light modulation rate curve corresponding to the present invention；
Figure 14 is the schematic diagram of light modulation smoothness curve corresponding to the present invention；
Figure 15 is the voltage-dropping type LED lamp circuit schematic diagram on the floating ground of the embodiment of the present invention.
Embodiment
For clearer explanation the solution of the present invention, here, briefly being introduced prior art.
In current LED illumination controllable silicon light modulation control chip field, LED lamp bead brightness is as light modulation angle is from mostly small
Situation of change, it is a very important design parameter, is typically stated with dimming curve.The shape of dimming curve determines people
Sense of reality of the eye vision for thyristor regulating light effect.
The first prior art：
As shown in figure 1, dimming curve is straight line；If carrying out deep anatomy to exchange light curve, the dimming curve is made to be
Dim (x), then it is used for the curve for characterizing dimming curve performance：
1st, rate curve (as shown in Figure 2) is dimmed, is the function of first order of dimming curve：
2nd, smoothness curve (as shown in Figure 3) is dimmed, is the ratio between dimming curve and light modulation rate curve：
As seen from the figure, it is 1 that dim_speed (x) curves are constant, is represented when brightness is high, and light modulation speed is 1, and in brightness
When low, light modulation speed is still 1；Such dimming curve practical manifestation is poor, and reason is that light modulator is turned down in high brightness
When a lot, it can just perceive brightness and decrease；And in low-light level, light modulator is somewhat adjusted a bit, and brightness just declines substantially；I.e.
The technology dimming effect is poor.
Second of prior art：
As shown in figure 4, dimming curve is 2 sections of matched curves, and every section is all straight line；Corresponding dim_speed (x) is as schemed
Shown in 5, dim_smoothly (x) is as shown in Figure 6；
As seen from the figure, technology dim_speed (x) curves are smaller larger when x is big, centre when x is small
There is a step, be sectional curve；The curve is compared with the first prior art, and when brightness is high, light modulation speed is larger, and
When brightness is low, light modulation speed is smaller, and this has met the basic demand of light modulation；But the dimming curve practical manifestation is also poor,
There are following two reasons.1st, there is step in light modulation speed, and when being dimmed near step, visual perception is poor, it may appear that light modulation
Speed is mutated the situation to 1.25 by 0.5；2nd, x from smaller (0.33) always to the end, light modulation speed is definite value, at this
In the range of sense organ be still poor；The curve maximum and minimum value difference are 0.8, represent entirely dimming in section
The impression of human eye is changed into 0.8 from 0, and difference is larger, and a step be present, and visual experience is poor.In engineering practice, step letter
The compromise problem of precision and reliability number is often brought, such dimming curve controls the x-axis at step in actual design
And it is difficult that the value of y-axis, which does not have deviation,.
The third prior art：
Formed as shown in fig. 7, dim (x) is three line segments, the curve is under the premise of higher reliability is met, to segmentation
Improved to greatest extent in dimming curve performance.Corresponding dim_speed (x) is as shown in figure 8, dim_
Smoothly (x) is as shown in Figure 9；Technology dim_speed (x) curves when x is small to be smaller, it is larger when x is big,
There are two steps centre, is sectional curve；The curve is compared with second of prior art, and when brightness is high, light modulation speed is bigger,
More coincide the requirement dimmed；But the dimming curve practical manifestation is also undesirable, reason is that light modulation speed has two
Step, when being dimmed near step, visual perception is poor, it may appear that light modulation speed is sported 1.0 by 0.5 or dashed forward by 1.0
It is changed into 1.67 situation.Light modulation smoothness curve dim_smoothly (x) maximum corresponding to the technology and minimum value difference are
0.6, represent that difference is larger, and two steps, visual experience be present entirely the impression of human eye is changed into 0.6 from 0 in light modulation section
It is undesirable.Similar with second of prior art, in engineering practice, it is in distress to control the precision of the x-axis at the two steps and y-axis
Degree.
In order that those skilled in the art more fully understand the technical scheme in the application, it is real below in conjunction with the application
The accompanying drawing in example is applied, the technical scheme in the embodiment of the present application is clearly and completely described, it is clear that described implementation
Example only some embodiments of the present application, rather than whole embodiments.It is common based on the embodiment in the application, this area
All other embodiment that technical staff is obtained under the premise of creative work is not made, it should all belong to the application protection
Scope.
Figure 10 is a kind of schematic diagram of LED light adjusting systems of the present invention, referring to Fig. 1, a kind of LED stepless dimmings system, and bag
Include：
Light adjusting circuit 100 is treated, and the adjusting control circuit 200 dimmed for treating light adjusting circuit 100；
Adjusting control circuit 200 includes：
Input is coupled in initial adjustment voltage, the dimming curve circuit 3 for producing natural logrithm dimming curve；
First input end is coupled in the output end of dimming curve circuit 3, and the second input is coupled in the mistake of light modulation detection signal
Poor amplifier 2；
Input is coupled in the output end of error amplifier 2, and output end is coupled in the PWM control modules 1 of switching tube；
PWM control modules 1 treat light adjusting circuit 100 and carry out brightness adjustment control by adjusting dutycycle.
The present invention can produce the dimming curve circuit of natural logrithm dimming curve due to adding, because natural logrithm is adjusted
Light curve avoids straight line dimming curve, segmented is fitted dimming curve brightness during dimming curve and changes lofty, light modulation
The problem of smoothness, uniformity and robustness are deteriorated；Brightness change is not smooth lofty so that human eye vision is comfortable on and soft
With.
Figure 11 is the schematic diagram of the dimming curve generation module of the present invention, and with reference to Fig. 1, the present embodiment is preferable, and light modulation is bent
Line circuit 3 includes dimming curve generation module, and the input of dimming curve generation module is coupled respectively to input signal S and compared
Reference variable X, the output end of dimming curve generation module are coupled in error amplifier by PWM module.Believed by inputting
Number S and benchmark variable X carry out the control of dimming curve, exemplified by turning down brightness, in the case of LED high brightness, and brightness
Decrease speed is fast, in low-light level, then decrease speed can be controlled slow, so, human eye seems the change of brightness
Will smooth uniform it is many, dimming effect improves.
Figure 12 is schematic diagram corresponding to the dimming curve of the present invention, and Figure 13 is light modulation speed corresponding to the dimming curve of the present invention
Write music the schematic diagram of line；Figure 14 is light modulation smoothness curve corresponding to the dimming curve of the present invention；The present embodiment is preferable, light modulation
Curve generation module includes dimming curve radian controller 21, saw-toothed wave generator 22 and comparator 23；
The input of dimming curve radian controller 21 is coupled in input signal S, and output signal 6+S is exported to sawtooth
Wave producer 22；
Saw-toothed wave generator 22 carries out logarithm sawtooth waveforms computing to output signal, obtains the natural logrithm that a cycle is T
Sawtooth waveforms ln (6+S)-ln (6+S-6t/T), and natural logrithm sawtooth waveforms is output to the first input end of comparator；
Second input of comparator 23 is coupled in benchmark variable X, comparator 23 according to natural logrithm sawtooth waveforms and
Benchmark variable X relatively obtains dimming curve：It is and dimming curve is defeated
Go out the input to PWM module 24.The benchmark variable X is mainly used in substituting or represents the brightness of LED, X's
Value can take 0 to 1, wherein 1 represents high-high brightness, and 0 represents minimum brightness, can according to circumstances be varied from；And S then takes
Value 0.5≤S≤2, are defaulted as 1, are the variables of dimming curve radian controller, user can set S value, to dimming curve
Radian be finely adjusted；The expression formula of the dimming curve is analyzed with tool of mathematical analysis, it is found that under different S, radian has
Fine distinction, thus in concrete operations, S value can be adjusted for different situations；The dimming curve produces
Module obtains dimming curve, the adjustment electricity for adjusting to obtain by the dimming curve according to input signal S and benchmark variable X
Pressure, this can be caused to treat that the brightness of light adjusting circuit change is smooth, be comfortable on human eye and soft, dimming effect obtains further
Enhancing.
The first input end of PWM module 24 is used to receive dimming curve, and the second input is then coupled in initial adjustment
Voltage；
PWM module 24 is used to wait to adjust according to dimming curve and initial adjustment voltage, modulation output adjustment voltage
The light modulation of optical circuit 100.The initial adjustment voltage is the initial value that user needs sets itself according to light adjusting system, is led to
Standing to be set between 100mV-600mV, the LED maximum current of final LED control system is the initial adjustment voltage divided by company
The resistance for connecing CS terminals (Figure 10) obtains；Wherein the curve representation formula of the dimming curve can be by deformation：[0.5≤K≤2], x ∈ (0,1), wherein S and K are fine setting parameter, for adjusting
The crooked radian of whole curve, the two parameters are extended to the scope of application of the present invention, can be directed to different occasion, no
Same country and the crowd of different nationalities are finely adjusted to curve, to be optimal dimming effect.
In this programme, dimming curve dim (x), light modulation rate curve dim_speed (x) and light modulation smoothness curve dim_
Not only curve shape is good by smoothly (x), and without step, flex point, is adapted to engineering practice, reliability is high, robustness is good.Should
Curve is in design, it is only necessary to mono- initial value of given S or K, curve self-assembling formation；Shape is only limited by S or K precision, this
Compared with three kinds of prior art dimming curves, reliability, robustness are suitable with the first simplest prior art of function, are higher than
Second and the third prior art.The initial adjustment voltage is pre-set, and is obtained according to the situation for treating light adjusting circuit；
The dimming curve generation module obtains dimming curve, adjusted by the dimming curve according to input signal S and benchmark variable X
It is whole, initial adjustment voltage is optimized into adjustment and is adjusted voltage, the adjustment voltage after optimization is used to treat light adjusting circuit
Light modulation, this can be caused to treat that the brightness of light adjusting circuit change is smooth, be comfortable on human eye and soft, dimming effect is obtained into one
Step enhancing.
The present embodiment is preferable, and the output end of PWM module is also coupled with a wave filter 25.Wave filter removes signal
Impurity, signal interference is avoided, be advantageous to the raising of dimming effect.
The present embodiment is preferable, and stepless dimming system also includes being used for the power supply VIN to light adjusting circuit power supply is treated；Light modulation control
Circuit 200 processed also includes switching tube 6；
The control terminal of switching tube 6 is coupled in the output end of PWM control modules 1, and input, which is coupled in, treats that light adjusting circuit 100 exports
End, output end are coupled respectively to the negative pole of earth terminal and power supply by divider resistance 7；
Second input of error amplifier 2 is coupled between the output end of switching tube 6 and divider resistance 7, is adjusted for gathering
Light detecting signal.The input of slowdown monitoring circuit to be checked is connected to positive source, output end by switching tube, via divider resistance, point
Power cathode and earth terminal are not coupled in it；In this way, by the detection to divider resistance, it can indirectly detect this and treat light adjusting circuit
Circuit conditions, and then cause the adjusting control circuit with the adjustment voltage of output matching can treat the tune of light adjusting circuit
Light.
The present embodiment is preferable, and adjusting control circuit 200 also includes a filter capacitor 5, and one end of filter capacitor 5 is coupling in
Between error amplifier 2 and PWM control modules 1, other end ground connection.Filter capacitor removes signal impurity, reduces signal interference, right
It is helpful to improve dimming effect.
The present embodiment is preferable, treats that light adjusting circuit is coupled between positive source and power cathode, treats that light adjusting circuit includes：
It is connected to and treats LED 10 between light adjusting circuit input and output end,
The output filter capacitor 11 being connected between LED input and output end,
It is coupled in LED output end and treats the fly-wheel diode 9 between light adjusting circuit output end,
It is coupled in LED input and treats the power inductance 8 between light adjusting circuit output end.Buck-boost type LED altogether
The examples of circuits connection of lamp bead, power supply are direct current；The ground of controller is referred to altogether with systematically identical, it is with floating relative
Should；Buck-boost type is a kind of topological structure, the entitled Buckboost of English, this topological structure allow output voltage be less than or
Higher than input voltage, with buck topology (buck, output voltage are less than input voltage) and booster type topology (boost, output electricity
Pressure is higher than input voltage) it is corresponding certain, the solution of the present invention is not limited only to this circuit, is only for example herein；In this circuit, open
When closing pipe opening, power inductance charging；When switching tube is closed, power inductance and fly-wheel diode coordinate afterflow, and LED is carried out
Power supply, and control constant current；The effect of divider resistance mainly when switching tube is opened, power inductance charges, carries out treating light modulation electricity
The detection on road, and then during by the way that electric discharge is calculated, this treats the circuit conditions of light adjusting circuit.
Figure 15 is the voltage-dropping type LED lamp circuit schematic diagram on the floating ground of the embodiment of the present invention, and as shown in figure 15, the present embodiment is excellent
Choosing, stepless dimming system also includes being used for the power supply to light adjusting circuit power supply is treated；Adjusting control circuit also includes switching tube；
The control terminal of switching tube 6 is coupled in the output end of PWM control modules 1, and input is coupled in positive source, and output end is led to
Cross the input that divider resistance 7 is coupled respectively to treat light adjusting circuit；
Second input of error amplifier 2 is coupled between the output end of switching tube 6 and divider resistance 7, is adjusted for gathering
Light detecting signal；
Treat that light adjusting circuit is coupled between divider resistance 7 and power cathode, treat that light adjusting circuit includes：
It is series at and treats power inductance 8 and output filter capacitor 11 between light adjusting circuit input and output end,
It is connected to and treats fly-wheel diode 9 between light adjusting circuit input and output end,
It is parallel to the LED 10 of output filter capacitor.The examples of circuits connection of the buck-boost type LED on floating ground, together
Buck-boost type LED lamp circuit connection it is corresponding.
Both the above, two kinds of simple example connections are merely provided, if meeting other circuits of inventive concept
Connection is also possible.
Preferred embodiment of the invention described in detail above.It should be appreciated that one of ordinary skill in the art without
Creative work can is needed to make many modifications and variations according to the design of the present invention.Therefore, all technologies in the art
Personnel are available by logical analysis, reasoning, or a limited experiment on the basis of existing technology under this invention's idea
Technical scheme, all should be in the protection domain being defined in the patent claims.
Claims (7)
- A kind of 1. LED stepless dimmings system, it is characterised in that including：Light adjusting circuit is treated, and for the adjusting control circuit treated light adjusting circuit and dimmed；The adjusting control circuit includes：Input is coupled in initial adjustment voltage, the dimming curve circuit for producing dimming curve；First input end is coupled in the dimming curve circuit output end, and the second input is coupled in the error of light modulation detection signal Amplifier；Input is coupled in error amplifier output, and output end is coupled in the PWM control modules of switching tube；The PWM control modules treat that light adjusting circuit carries out brightness adjustment control by adjusting dutycycle, to described；The dimming curve circuit includes dimming curve generation module, and the input of the dimming curve generation module couples respectively In input signal S and benchmark variable X, the output end of the dimming curve generation module is coupled in by PWM module The error amplifier；The dimming curve generation module includes dimming curve radian controller, saw-toothed wave generator and comparator；The input of the dimming curve radian controller is coupled in the input signal S, and output signal 6+S is exported to institute State saw-toothed wave generator；The saw-toothed wave generator carries out logarithm sawtooth waveforms computing to the output signal, and it is the naturally right of T to obtain a cycle Number sawtooth waveforms ln (6+S)-ln (6+S-6t/T), and the natural logrithm sawtooth waveforms is output to the first of the comparator and inputted End；Second input of the comparator is coupled in the benchmark variable X, and the comparator is according to the natural logrithm Sawtooth waveforms and benchmark variable X relatively obtain dimming curve： And the dimming curve is output to the input of the PWM module.
- 2. LED stepless dimmings system as claimed in claim 1, it is characterized in that：The first input end of the PWM module is used In receiving the dimming curve, the second input is then coupled in initial adjustment voltage；The PWM module is used for described treat according to the dimming curve and initial adjustment voltage, modulation output adjustment voltage The light modulation of light adjusting circuit.
- 3. LED stepless dimmings system as claimed in claim 2, it is characterized in that：The output end of the PWM module also couples There is a wave filter.
- 4. LED stepless dimmings system as claimed in claim 1, it is characterized in that：The stepless dimming system also includes being used to give The power supply for treating light adjusting circuit power supply；The adjusting control circuit also includes switching tube；The control terminal of the switching tube is coupled in the PWM control modules output end, and input, which is coupled in, described treats light adjusting circuit Output end, output end are coupled respectively to the negative pole of earth terminal and the power supply by divider resistance；Second input of the error amplifier is coupled between the switching tube output end and divider resistance, is adjusted for gathering Light detecting signal.
- 5. LED stepless dimmings system as claimed in claim 1, it is characterized in that：The adjusting control circuit also includes a filtering Electric capacity, one end of the filter capacitor are coupling between error amplifier and the PWM control module, other end ground connection.
- 6. the LED stepless dimming systems as described in claim 1-5 is any, it is characterized in that：It is described to treat that light adjusting circuit is coupled in electricity It is described to treat that light adjusting circuit includes between source positive pole and power cathode：The LED treated between light adjusting circuit input and output end is connected to,The output filter capacitor being connected between the LED input and output end,It is coupled in the LED output end and treats the fly-wheel diode between light adjusting circuit output end,It is coupled in the LED input and treats the power inductance between light adjusting circuit output end.
- 7. the LED stepless dimming systems as described in claim 1-3 is any, it is characterized in that：The stepless dimming system also includes For to the power supply for treating light adjusting circuit power supply；The adjusting control circuit also includes switching tube；The control terminal of the switching tube is coupled in the PWM control modules output end, and input is coupled in positive source, output end The input for treating light adjusting circuit is coupled respectively to by divider resistance；Second input of the error amplifier is coupled between the switching tube output end and divider resistance, is adjusted for gathering Light detecting signal；It is described to treat that light adjusting circuit is coupled between divider resistance and power cathode, it is described to treat that light adjusting circuit includes：The power inductance and output filter capacitor treated between light adjusting circuit input and output end is series at,The fly-wheel diode treated between light adjusting circuit input and output end is connected to,It is parallel to the LED of the output filter capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610369781.0A CN106028511B (en) | 2016-05-30 | 2016-05-30 | A kind of LED stepless dimmings system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610369781.0A CN106028511B (en) | 2016-05-30 | 2016-05-30 | A kind of LED stepless dimmings system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106028511A CN106028511A (en) | 2016-10-12 |
| CN106028511B true CN106028511B (en) | 2017-12-29 |
Family
ID=57092352
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610369781.0A Active CN106028511B (en) | 2016-05-30 | 2016-05-30 | A kind of LED stepless dimmings system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106028511B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111511077B (en) * | 2019-01-31 | 2022-07-08 | 松下知识产权经营株式会社 | Dimming curve generation method, dimming curve generation device and LED lighting device |
| CN110536515A (en) * | 2019-09-20 | 2019-12-03 | 深圳瓦特智汇科技有限公司 | One kind can simply set initial current and to the adjustable light adjusting circuit of initial current |
| CN111798813B (en) * | 2020-07-20 | 2022-01-04 | 昆山国显光电有限公司 | Brightness adjusting method and device of display device and display device |
| US11432385B2 (en) * | 2020-08-07 | 2022-08-30 | Analog Devices, Inc. | Single comparator exponential-scale PWM dimming |
| CN113993244A (en) * | 2021-11-25 | 2022-01-28 | 深圳市火乐科技发展有限公司 | Dimming circuit and light emitting device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102438367A (en) * | 2011-10-25 | 2012-05-02 | 复旦大学 | Linear dimming system based on brightness perceived by human eyes |
| CN104902648A (en) * | 2015-06-11 | 2015-09-09 | 矽力杰半导体技术(杭州)有限公司 | LED light-adjustment circuit with silicon controlled rectifier, and light-adjustment method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7535183B2 (en) * | 2007-04-27 | 2009-05-19 | Korry Electronics Co. | Apparatus and method to provide a hybrid linear/switching current source, such as for high-efficiency, wide dimming range light emitting diode (LED) backlighting |
-
2016
- 2016-05-30 CN CN201610369781.0A patent/CN106028511B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102438367A (en) * | 2011-10-25 | 2012-05-02 | 复旦大学 | Linear dimming system based on brightness perceived by human eyes |
| CN104902648A (en) * | 2015-06-11 | 2015-09-09 | 矽力杰半导体技术(杭州)有限公司 | LED light-adjustment circuit with silicon controlled rectifier, and light-adjustment method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106028511A (en) | 2016-10-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106028511B (en) | A kind of LED stepless dimmings system | |
| CN105207502B (en) | Route ripple compensation for flicker free LED driver | |
| CN103249220B (en) | Semiconductor light emitting element drive device and lighting fixture with the same | |
| CN104426473B (en) | A kind of solar energy photovoltaic system control method and control device | |
| CN104540292B (en) | Suitable for the light adjusting circuit and light adjusting system on controllable silicon dimmer circuit | |
| CN103563489B (en) | Dimming ballast for electrodeless lamp | |
| CN109309983A (en) | LED drive circuit and LED light | |
| CN106851927A (en) | A kind of multichannel light modulation toning LED drive circuit of speech recognition | |
| CN207070203U (en) | The backlight constant-current control circuit and television set of television set | |
| CN206674254U (en) | One kind is used for high power factor LED drive power switching frequency limiting circuit | |
| CN203801118U (en) | High-efficiency linear LED driver based on adaptive control | |
| CN107277966A (en) | One kind is used for high power factor LED drive power switching frequency limiting circuit | |
| CN104901404B (en) | A kind of charging circuit and output control method | |
| CN109104783A (en) | Driving circuit and LED light including driving circuit | |
| AT16908U1 (en) | PFC module for intermittent operation | |
| CN205265954U (en) | Acoustic control LED circuit | |
| CN104703368B (en) | Circuit and method that a kind of stroboscopic for improving LED light device and pressure are dodged | |
| CN110488907A (en) | A kind of mixing step-length maximum power tracking and controlling method for photovoltaic power generation | |
| CN205451749U (en) | Backlight drive circuit and television | |
| CN208174546U (en) | A kind of medical switch power source adapter | |
| CN109839524A (en) | Voltage dip generator and voltage dip control system | |
| CN111416537B (en) | Rectifier and modulation method thereof | |
| CN103249200A (en) | Method for controlling light modulation device | |
| CN109962636A (en) | Current control device and method of converter and wind generating set | |
| CN109152145B (en) | Single-live-wire low-harmonic adjustment method for controlling brightness 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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20180620 Address after: 518040 Guangdong Shenzhen Futian District Che Kung Temple Tianan Digital City Innovation Technology Plaza two phase 1002, east block. Patentee after: Microelectronics Co., Ltd. of Shenzhen City, the first stable Address before: 201612 Shanghai Songjiang District Caohejing Development Zone Songjiang high tech Park Xinzhu Road 258, 32 Building 702 room -1 Patentee before: Shanghai DX Semiconductors Co., Ltd. |
|
| TR01 | Transfer of patent right |