CN108513396A - A kind of control method of LED lamp invariable power constant current time-sharing multiplex - Google Patents
A kind of control method of LED lamp invariable power constant current time-sharing multiplex Download PDFInfo
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- CN108513396A CN108513396A CN201810259752.8A CN201810259752A CN108513396A CN 108513396 A CN108513396 A CN 108513396A CN 201810259752 A CN201810259752 A CN 201810259752A CN 108513396 A CN108513396 A CN 108513396A
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Classifications
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- 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]
- H05B45/20—Controlling the colour of the light
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- 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]
- H05B45/30—Driver circuits
- H05B45/32—Pulse-control circuits
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- 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]
- H05B45/30—Driver circuits
- H05B45/345—Current stabilisation; Maintaining constant current
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- 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]
- H05B45/40—Details of LED load circuits
- H05B45/44—Details of LED load circuits with an active control inside an LED matrix
- H05B45/46—Details of LED load circuits with an active control inside an LED matrix having LEDs disposed in parallel lines
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Abstract
The invention discloses a kind of control methods of LED lamp invariable power constant current time-sharing multiplex, including the LED light of the driving of Switching Power Supply, N paths of LEDs and N kind colors, and the LED light of each color corresponds to and provides a kind of light color；It is described control LED lamp invariable power constant current time-sharing multiplex implementation steps include：It determines and needs to drive the LED light color category Y lighted；Determine total output current peak I of the LED light of Y kinds color in step S11And gross output P1；The total output current peak value for improving the LED light of Y kind colors in step S2 is I2；The current peak of the LED light output of each color is I at this time2The LED light output power of/Y, each color is（X×P1）/Y；The LED light PWM duty cycle of each color is 1/Y in rate-determining steps S3；The turn-on time of the LED light of each color in the step that is staggered S4.The present invention has the constant advantageous effect close to gross output and constant current of power so that when LED lamp is used in mixed way under a variety of colors pattern.
Description
Technical field
The present invention relates to the control fields of the power of LED lamp and electric current, more particularly, to a kind of LED lamp perseverance work(
The control method of rate constant current time-sharing multiplex.
Background technology
Full-color LED lamp is generally by the LED lamp bead of multiple color by controlling the output brightness of different colours lamp bead to produce
The light of raw different colours.Such as our familiar three-primary color LEDs（R/G/B）, when their brightness ratio is 1:1:Meeting when 1
Generate white light.
LED lamp generally uses constant current driven, and the duty ratio by controlling LED current makes LED average currents change
Become to change the brightness of LED, this is also known as digital dimming method.Duty ratio refers to the conduction time in a pulse cycle
Relative to ratio more shared by total time.However existed in actual use using digital dimming method for LED lamp
Some drawbacks.
As shown in Figure 1 for traditional LED lamp tool circuit block diagram, including Switching Power Supply, control chip, N paths of LEDs driving and it is right
The LED light for the N kind colors answered.Switching Power Supply is responsible for alternating current to be converted into direct current for LED driving uses, and control chip is responsible for
The pwm signal for exporting different duty is used as dimming control signal, LED to drive generation peak value constant and duty ratio to LED drivings
Adjustable electric current is simultaneously transferred to LED light, and LED light is according to the light for requiring output different colours and different brightness.
Pwm signal is a kind of to the digitally coded method of analog signal level progress.Assuming that in 1 second, have 0.5 second when
Between switch and be open, close within 0.5 second, then lamp went out 0.5 second with regard to bright 0.5 second, and continued in this way, lamp will flicker.If
Frequency is turned up a bit again, such as 1 millisecond, opens within 0.5 second, go out within 0.5 second, then the frequency of lamp flicker is just very high.Work as light flash
Frequency be more than certain value, human eye is imperceptible.So when frequency improves, human eye is the flicker that can't see lamp, is only seen
The brightness of lamp only has original half.Similarly, if in 1 millisecond, 0.1 millisecond is opened, and 0.9 millisecond goes out, then the brightness of lamp is only
There are original 1/10th.It keeps certain voltage or electric current constant, but changes the turn-on and turn-off time in some cycles, this
Sample, which is equivalent to, to be held on, but changes voltage or size of current.
Duty ratio refers in a pulse cycle, and conduction time is relative to the ratio shared by total time.
In the digital dimming method of traditional LED lamp tool, the power per paths of LEDs is approximately equal to N/mono- of gross output.
Digital dimming mode requires peak point current that cannot change, and either a kind of color dims, two kinds of colors dim or a variety of
Color dims, and corresponding output power can only be the percentage of corresponding color and total number of colors when different colours dim.Such as
There are four types of colors to dim, and it is 100W that total power is exported when their all lights, and per road, the power of output is 25W at this time；Work as one kind
When color is opened, maximum output power can only be 25W；Two kinds of color mixing are in use, peak power output can only be 50W；
Three kinds of color mixing using when maximum output power can only be 75W；Only under all light pattern, it can just accomplish that 100W total powers are defeated
Go out.In such a mode, if it is desired to output power when various mode mixtures use and output work when all colours all light
Rate is close to accomplish.
Invention content
To overcome existing technological deficiency, the present invention provides a kind of controls of LED lamp invariable power constant current time-sharing multiplex
Method processed so that power when LED lamp is used in mixed way under a variety of colors pattern is constant close to gross output and perseverance
Constant current.
To achieve the purpose of the present invention, it is achieved using following technical scheme：
A kind of control method of LED lamp invariable power constant current time-sharing multiplex, including sequentially connected Switching Power Supply, N paths of LEDs drive
The LED light of N kind colors that are dynamic and connecting one to one respectively with the driving of N paths of LEDs, and the LED light of each color is corresponded to and is provided
A kind of light color；Wherein, N is the natural number more than 1；The implementation of the control LED lamp invariable power constant current time-sharing multiplex
Step includes：
S1：It determines and needs to drive the LED light color category Y lighted, wherein Y≤N；
S2：Determine total output current peak I of the LED light of Y kinds color in step S11And gross output P1；At this time each
The current peak of the LED light output of color is I1The LED light output power of/Y, each color are P1 /Y；
S3：The total output current peak value for improving the LED light of Y kind colors in step S2 is I2, wherein I2=X×I1, Y ＜ X≤N and X
For natural number；The current peak of the LED light output of each color is I at this time2The LED light output power of/Y, each color is（X
×P1）/Y；
S4：The LED light PWM duty cycle of each color is 1/Y in rate-determining steps S3；
S5：The turn-on time of the LED light of each color in the step that is staggered S4.
In the present invention, when the PWM of all colours reaches 100%, the luminous flux maximum and power of lamps and lanterns are maximum.However,
For all-colour LED other than all colours control this pattern simultaneously, the various demands for control such as monochrome, dichromatism, three colors are also had.
Due to constant-current circuit, for monochromatic 100% duty ratio output, the power of the monochromatic LED and brightness also can only be with all face
Color LED simultaneously all light when, the monochromatic LED lamp account for all colours LED power and brightness without too big difference.Equally, for more
Kind color（Not all color）100% duty ratio exports, and the power of multiple color output and brightness also can only be whole color outputs
It is percent how many, this when, the output power of power supply also had significant portion not utilize.If we need one kind
No matter lamps and lanterns control how many kinds of color, and when largest duty cycle will ensure that Switching Power Supply output power is constant, traditional LED controls
Method cannot achieve.And in the present invention, by improving the total peak point current and gross output of LED light output, and it is corresponding
The turn-on time of the PWM duty cycle of driven lightening LED lamp and each color LED light that is staggered is reduced to control LED lamp perseverance in ground
Power constant current time-sharing multiplex improves output power when each color LED light is lighted and keeps output power constant.
Further, the control method of the turn-on time for each color LED light that is staggered in the step S5 includes：Determine Y
The turn-on time T of the LED light of each color in the LED light of kind color1、T2、T3……TY, the T1、T2、T3……TYTwo-by-two it
Between mutually stagger.
Further, further include control chip, the driving of N paths of LEDs is connect with control chip respectively, and passes through control chip control
System driving.
Further, the N paths of LEDs driving is connected to switch power parallel respectively.
Further, per paths of LEDs, driving is correspondingly connected with a kind of LED light of color, each color in the N paths of LEDs driving
LED light include LED lamp bead that several are sequentially connected in series.
Compared with the prior art, the present invention, which has, effectively controls LED lamp invariable power constant current time-sharing multiplex, effectively improves
Output power and the advantageous effect for keeping output power constant when the LED light of each color is lighted.
Description of the drawings
Fig. 1 is the circuit block diagram of traditional LED lamp.
Fig. 2 is current output waveform figure when traditional LED lamp output driving 1-3 kind colors LED is lighted.
Fig. 3 is a kind of color LED when lighting, the curent change figure of the current peak A of driving circuit in whole cycle T.
When Fig. 4 is that two kinds of color LED are lighted, the PWM duty cycle variation and turn-on time variation of each color LED.
When Fig. 5 is that three kinds of color LED are lighted, the PWM duty cycle variation and turn-on time variation of each color LED.
When Fig. 6 is that N kind colors LED is lighted, the PWM duty cycle variation and turn-on time variation of each color LED.
Specific implementation mode
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with the accompanying drawings to embodiment of the present invention
It is described in more detail.
Embodiment
As shown in Figure 1, a kind of control method of LED lamp invariable power constant current time-sharing multiplex, including sequentially connected open
Powered-down source, the driving of N paths of LEDs, respectively LED drivings 1, LED drivings 2, LED drives N for LED drivings 3 ...；And respectively with the roads N
The LED light of N kind colors that LED drivings connect one to one, respectively the first color LED, second of color LED, the third
Color LED ... N kind color LED, and the LED light of each color corresponds to and provides a kind of light color；
Wherein, N is the natural number more than 1；
Further include control chip, the driving of N paths of LEDs is connect with control chip respectively, and by controlling chip controls driving；
The N paths of LEDs driving is connected to switch power parallel respectively；
Per paths of LEDs, driving is correspondingly connected with a kind of LED light of color in the N paths of LEDs driving, if the LED light of each color includes
The dry LED lamp bead being sequentially connected in series；
It is described control LED lamp invariable power constant current time-sharing multiplex implementation steps include：
S1：It determines and needs to drive the LED light color category Y lighted, wherein Y≤N；
S2：Determine total output current peak I of the LED light of Y kinds color in step S11And gross output P1；At this time each
The current peak of the LED light output of color is I1The LED light output power of/Y, each color are P1 /Y；
S3：The total output current peak value for improving the LED light of Y kind colors in step S2 is I2, wherein I2=X×I1, Y ＜ X≤N and X
For natural number；The current peak of the LED light output of each color is I at this time2The LED light output power of/Y, each color is（X
×P1）/Y；
S4：The LED light PWM duty cycle of each color is 1/Y in rate-determining steps S3；
S5：The turn-on time of the LED light of each color in the step that is staggered S4.
The control method of the turn-on time for each color LED light that is staggered in the step S5 includes：Determine Y kind colors
The turn-on time T of the LED light of each color in LED light1、T2、T3……TY, the T1、T2、T3……TYIt is mutually wrong between any two
It opens.
In step S4, such as：1. when we, which only need to control the LED light of one of which color, lights, i.e. Y=1, at this time one
The PWM duty cycle of kind of color LED light is 1/Y=1/1=1, i.e., PWM duty cycle is 100%, due in step S3 by the output of LED light
Power is increased to original X times, i.e., LED output powers are at this time（X×P1）/Y=（X×P1）/1=X×P1。
2. when we, which only need to control the LED light of two kinds of colors, lights, i.e. Y=2, at this time the LED light PWM of each color account for
Sky is than being 1/Y=1/2=0.5, i.e. PWM duty cycle is 50%, since the output power of LED light to be increased to original X in step S3
Times, i.e., LED output powers are at this time（X×P1）/Y=（X×P1）/ 2, i.e., the LED light output power of two kinds colors is not improve
Export X/2 times when peak point current.
3. when we need the LED light for controlling three kinds of colors to light, i.e. Y=3, at this time the LED light PWM of each color account for
For sky than being 1/Y=1/3=0.33, i.e., PWM duty cycle is 33%, original due to being increased to the output power of LED light in step S3
X times, i.e., LED output powers are at this time（X×P1）/Y=（X×P1）/ 3, i.e., the LED light output power of two kinds colors is not improve
Export X/3 times when peak point current.
4. when we need the LED light for controlling Y kind colors to light, the LED light PWM duty cycle of each color is 1/ at this time
Y, since the output power of LED light is increased to original X times in step S3, i.e., LED output powers are at this time（X×P1）/ Y,
The LED light output power of i.e. two kinds colors is X/Y times when not improving output peak point current.
Therefore, if we, which control X, is more than Y, we are it is ensured that defeated when the LED light of each color combination is lighted
Go out power and brightness is all higher than original output power and brightness.
Meanwhile to avoid improving output power and when peak point current, the skill that the transient current of Switching Power Supply can be caused excessive
Art problem, in step S5, by being staggered, the turn-on time of the LED light of each color in step S4 is realized.
As shown in Fig. 2, for example：When the LED light of control 1-3 kind colors is lighted, i.e. Y=1, N=3 set and do not improve originally
The output current of each color is 1A when peak point current, then total output current I1=3 × 1=3A, it is original to improve total peak point current
3 times, i.e. X=3, the peak point current I after raising2=X×I1=3×3=9A.The LED light for each color that is not staggered so is connected
When the time, the peak point current variation range of Switching Power Supply output is 0-9A, and the peak point current of Switching Power Supply output is bigger by 3 than originally
Times, it is easy to cause the excessive problem of the transient current of Switching Power Supply.
In the present invention, realize that control avoids the instantaneous electricity of Switching Power Supply by the turn-on time for each color LED light that is staggered
Flow through big technical problem.
As shown in figure 3, when only a kind of LED light of color is lighted in control, the current peak of driving circuit is 1A, at this time one
The PWM duty cycle of kind color LED light is 1/Y=1/1=1, i.e., the duty ratio of output current is 100% defeated inside whole cycle T
Go out.
As shown in figure 4, when needing the LED light for controlling two kinds of colors to light, it is specified that the PWM duty cycle of each color is 1/
Y=1/2=0.5, i.e., inside whole cycle T, the PWM duty cycle that each color exports Electricity Federation is 50%, and the conducting of each color
Time is staggered.As shown, the first color LED light turn-on time T1It is 0-T/2 and T-3T/2, second color LED light
Turn-on time is T2It is T/2-T and 3T/2-2T, current waveform or 100% after two kinds of color mixing export.
As shown in figure 5, when needing the LED light for controlling 3 kinds of colors to light, it is specified that the PWM duty cycle of each color is 1/Y
=1/3=0.33, i.e., inside whole cycle T, the PWM duty cycle that each color exports Electricity Federation is 33%, and the conducting of each color
Time is staggered.As shown, the first color LED light turn-on time T1It is 0-T/3 and T-4T/3, second color LED light
Turn-on time is T2It is T/3-2T/3 and 4T/3-5T/3, the turn-on time of the third color LED light is T3It is 2T/3-T and 5T/3-
2T, the current waveform after three kinds of color mixing or 100% output.
As shown in fig. 6, when needing the LED light for controlling n kind colors to light, it is specified that the PWM duty cycle of each color is 1/Y
=1/n, i.e., inside whole cycle T, each color exports the PWM duty cycle of Electricity Federation as 1/n, and the turn-on time of each color
It is staggered.As shown, the first color LED light turn-on time T1It is 0-T/n and T-（1+1/n）T, second color LED light
Turn-on time is T2Be T/n-2T/n and（1+1/n）T-（1+2/n）The turn-on time of T, the third color LED light are T3It is 2T/n-
3T/n and（1+2/n）T-（1+3/n）T, the turn-on time T of n color LED lightNIt is（1-1/n）T-T and（2-1/n）T-2T, n
Current waveform after kind color mixing or 100% output.
In conclusion the present invention is by improving the output peak point current of LED light, controlling the PWM duties of each color LED light
Than and each color LED light that is staggered turn-on time, realize improve each color LED light output power, effectively improve
The advantageous effect of the conducting brightness of LED light.
Claims (5)
1. a kind of control method of LED lamp invariable power constant current time-sharing multiplex, which is characterized in that including sequentially connected switch
The LED light of power supply, the driving of N paths of LEDs and the N kind colors to connect one to one respectively with the driving of N paths of LEDs, and each color
LED light, which corresponds to, provides a kind of light color；Wherein, N is the natural number more than 1；The control LED lamp invariable power constant current point
The implementation steps of Shi Fuyong include：
S1：It determines and needs to drive the LED light color category Y lighted, wherein Y≤N；
S2：Determine total output current peak I of the LED light of Y kinds color in step S11And gross output P1；Each face at this time
The current peak of the LED light output of color is I1The LED light output power of/Y, each color are P1 /Y；
S3：The total output current peak value for improving the LED light of Y kind colors in step S2 is I2, wherein I2=X×I1, Y ＜ X≤N and X
For natural number；The current peak of the LED light output of each color is I at this time2The LED light output power of/Y, each color is（X
×P1）/Y；
S4：The LED light PWM duty cycle of each color is 1/Y in rate-determining steps S3；
S5：The turn-on time of the LED light of each color in the step that is staggered S4.
2. a kind of control method of LED lamp invariable power constant current time-sharing multiplex according to claim 1, feature exist
In the control method of the turn-on time for each color LED light that is staggered in the step S5 includes：In the LED light for determining Y kind colors
The turn-on time T of the LED light of each color1、T2、T3……TY, the T1、T2、T3……TYIt mutually staggers between any two.
3. a kind of control method of LED lamp invariable power constant current time-sharing multiplex according to claim 1, feature exist
In, further include control chip, N paths of LEDs driving respectively with control chip connect, and pass through control chip controls drive.
4. a kind of control method of LED lamp invariable power constant current time-sharing multiplex according to claim 1, feature exist
In the N paths of LEDs driving is connected to switch power parallel respectively.
5. a kind of control method of LED lamp invariable power constant current time-sharing multiplex according to claim 1, feature exist
In per paths of LEDs, driving is correspondingly connected with a kind of LED light of color in the N paths of LEDs driving, and the LED light of each color includes several
A LED lamp bead being sequentially connected in series.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810259752.8A CN108513396B (en) | 2018-03-27 | 2018-03-27 | Control method for constant-power constant-current time-sharing multiplexing of LED lamp |
| PCT/CN2019/072689 WO2019184567A1 (en) | 2018-03-27 | 2019-01-22 | Method for controlling led lamp constant-power constant-current time division multiplexing |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810259752.8A CN108513396B (en) | 2018-03-27 | 2018-03-27 | Control method for constant-power constant-current time-sharing multiplexing of LED lamp |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109712560A (en) * | 2019-02-20 | 2019-05-03 | 深圳市富满电子集团股份有限公司 | A kind of driving control system of LED display module |
| WO2019184567A1 (en) * | 2018-03-27 | 2019-10-03 | 广州市浩洋电子股份有限公司 | Method for controlling led lamp constant-power constant-current time division multiplexing |
| CN113692088A (en) * | 2021-08-13 | 2021-11-23 | 广州腾龙健康实业股份有限公司 | LED lamp system and LED lamp control method for reducing instantaneous power |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112969261A (en) * | 2021-02-06 | 2021-06-15 | 上海福宇龙汽车科技有限公司 | Time-sharing driving circuit and method for multiple paths of LED lamps |
| CN116647956B (en) * | 2023-06-12 | 2024-05-03 | 钰泰半导体股份有限公司 | Parallel time-sharing multiplexing brightness control system based on series switch |
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| CN108513396B (en) * | 2018-03-27 | 2020-10-23 | 广州市浩洋电子股份有限公司 | Control method for constant-power constant-current time-sharing multiplexing of LED lamp |
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| US20090251071A1 (en) * | 2008-04-08 | 2009-10-08 | Micrel, Inc. | Driving Multiple Parallel LEDs with Reduced Power Supply Ripple |
| CN102316647A (en) * | 2011-09-15 | 2012-01-11 | 四川新力光源有限公司 | LED lamp color temperature adjusting driver |
| CN102421230A (en) * | 2011-09-15 | 2012-04-18 | 四川新力光源有限公司 | Color adjusting driver for LED (Light-Emitting Diode) lamp |
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| WO2019184567A1 (en) * | 2018-03-27 | 2019-10-03 | 广州市浩洋电子股份有限公司 | Method for controlling led lamp constant-power constant-current time division multiplexing |
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| CN113692088A (en) * | 2021-08-13 | 2021-11-23 | 广州腾龙健康实业股份有限公司 | LED lamp system and LED lamp control method for reducing instantaneous power |
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| CN108513396B (en) | 2020-10-23 |
| WO2019184567A1 (en) | 2019-10-03 |
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