CN109041340A - A kind of electric current when LED multi-path dims distributes control method - Google Patents
A kind of electric current when LED multi-path dims distributes control method Download PDFInfo
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Abstract
The present invention relates to electric currents when a kind of light modulation of LED multi-path to distribute control method, includes the following steps: to measure the received maximum current value of each paths of LEDs energy respectively；The maximum current value Ip that measurement power supply can provide；Based on the received maximum current value of each paths of LEDs energy and dim signal value, the current control curve of each paths of LEDs is obtained respectively；The current control curve of power supply is obtained based on Ip and dim signal value；The corresponding each road current value of dim signal value for controlling each paths of LEDs is obtained respectively, and each road current value is added and obtains total current value Ia；Obtain the maximum dimmer signal value in the dim signal value of each paths of LEDs；Obtain the current value Ib that power supply should export under the maximum dimmer signal value；Compare Ia and Ib；If it is constant to control Ia by Ia≤Ib；If Ia > Ib, each road current value decline is controlled, until Ia≤Ib.The electric current that can be not only provided according to the actual use number reasonable employment power supply of LED, and in each paths of LEDs electric current assigning process, the electric current of LED and brightness can be made not to mutate, smooth transition.
Description
Technical field
The present invention relates to technical field of LED illumination, and electric current when dimming more particularly, to a kind of LED multi-path distributes control
Method processed.
Background technique
There are mainly two types of for existing LED multi-path current distribution method: 1, the first is the maximum that can provide power supply
Electric current is average or is proportionately distributed to each paths of LEDs, and the getable maximum current of each paths of LEDs institute is fixed and invariable at this time, will not
It is increased or decreased because of the actual use number of LED；2, second averagely or is in proportion divided according to the actual use number of LED
With the electric current that power supply provides, but the electric current of LED and brightness can mutate in the actual use number for increasing or decreasing LED,
It is unable to smooth transition.
Summary of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide electric currents when a kind of light modulation of LED multi-path to distribute control
Method processed, the electric current that not only can be reasonably used power supply to provide according to the actual use number of LED, and in each paths of LEDs electric current
In assigning process, the electric current of LED and brightness can be made not to mutate, smooth transition.
In order to achieve the above objectives, the technical solution adopted by the present invention is that:
Electric current distribution control method when a kind of light modulation of LED multi-path is provided, is included the following steps:
S1. the received maximum current value of each paths of LEDs energy is obtained respectively, and the maximum current value of each paths of LEDs is less than or equal to each road
The load current value of LED；Obtain the maximum current value Ip that power supply can provide；Ip is greater than individually every paths of LEDs can received maximum electricity
Flow valuve；The received maximum current value of each paths of LEDs energy, root can be obtained according to each paths of LEDs parameter and each LED drive circuit relevant parameter
The maximum current value Ip that power supply can provide can be obtained according to power parameter；
S2. based on the received maximum current value of each paths of LEDs energy and dim signal value, the electric current control of each paths of LEDs is obtained respectively
Koji-making line；The maximum current value Ip and dim signal value that can be provided based on power supply, obtain the current control curve of power supply；Electric current control
Koji-making line is the mapping of dim signal value to electric current accounting, and electric current accounting is the corresponding current value of dim signal value and maximum current
The ratio of value；
S3. when LED multi-path dims, the current control curve based on each paths of LEDs obtains the light modulation for controlling each paths of LEDs respectively
Each road current value is added and obtains total current value Ia by the corresponding each road current value of signal value；
S4. when LED multi-path dims, compare the dim signal value for controlling each paths of LEDs and obtain maximum dimmer letter therein
Number value；Current control curve based on power supply obtains the current value Ib that power supply should export under the maximum dimmer signal value；
S5. compare Ia and Ib；If it is constant to control Ia by Ia≤Ib；If Ia > Ib is controlled under each road current value
Drop, until Ia≤Ib.
In above scheme, according to the dim signal value of each paths of LEDs of acquisition, can obtain LED actual use number and
Each road current value, each road current value, which is added, to obtain can add up to current value Ia, according to maximum dimmer signal value, can obtain electricity
The current value Ib that source should export under the maximum dimmer signal value；By comparing Ia and Ib, reasonably provided using power supply
Electric current, due to current value difference very little of each paths of LEDs between adjacent dim signal value, even if reducing each road electric current
Value, reduction amount be also it is seldom, this makes the electric current of LED and brightness not to mutate, smooth transition.
In actual use, it is assumed that control two paths of LED light modulation, as there may be following three kinds of shapes for the variation of dim signal value
State:
1) Ia is less than Ib, the dim signal value that this two paths of LED can be obtained with the current control curve based on each paths of LEDs at this time
Corresponding each road current value is dimmed, and brightness can be mentioned as bright as possible；
2) Ia is equal to Ib, the dim signal value that this two paths of LED can be obtained with the current control curve based on each paths of LEDs at this time
Corresponding each road current value is dimmed, and brightness can be mentioned as bright as possible；
3) Ia is greater than Ib, the dim signal that this two paths of LED cannot be obtained with the current control curve based on each paths of LEDs at this time
It is worth corresponding each road current value light modulation, needs to reduce the current value of this two paths of LED, until Ia is less than or equal to Ib, due to each paths of LEDs
Current value difference very little between adjacent dim signal value, therefore even if reducing each road current value, reduction amount is also seldom
, this makes the electric current of LED and brightness not to mutate, smooth transition.
Control three paths of LEDs or more light modulation when, referring to two paths of LED light modulation when the case where.
Preferably, it in step S5, if Ia > Ib, controls each road current value averagely or declines in proportion.It can be according to reality
Border needs, and suitable ratio is selected to control each road current value decline.
Preferably, in step S2, the current control curve of each paths of LEDs and the current control curve of power supply pass through formula (1)
It calculates:
Wherein, IiFor i-th point of current value in the current control curve that is calculated；
IOFor the maximum current value of this current control curve；For each paths of LEDs, IOIt can received maximum electricity for each paths of LEDs
Flow valuve；For power supply, IOThe maximum current value Ip that can be provided for power supply；
DMX is dim signal value, that is, is used to control the DMX numerical value of DMX light modulation, and the numerical value for being 0 to 255；
GAMMA is GAMMA corresponding to the current control curve of corresponding current value formation when DMX changes from 0 to 255
Value, for each paths of LEDs, the numerical value of GAMMA is identical, and the general value of GAMMA is 2.0,2.2,2.4,2.6 or 2.8, and GAMMA value is got over
Small, current control curve is closer to straight line, and GAMMA value is bigger, and current control curve is more bent, and can select according to actual needs
Take suitable GAMMA value.
Compared with prior art, the beneficial effects of the present invention are:
Electric current when a kind of LED multi-path light modulation of the invention distributes control method, according to the dim signal of each paths of LEDs of acquisition
Value, can obtain LED actual use number and each road current value, by each road current value be added obtain can add up to current value
Ia can obtain the current value Ib that power supply should export under the maximum dimmer signal value according to maximum dimmer signal value；Pass through
Compare Ia and Ib, the electric current reasonably provided using power supply, due to current value of each paths of LEDs between adjacent dim signal value
Difference very little, therefore even if reducing each road current value, reduction amount be also it is seldom, this send out the electric current of LED and brightness will not
Raw mutation, smooth transition.
Detailed description of the invention
Fig. 1 is the schematic diagram of current control curve.
Specific embodiment
The present invention is further illustrated With reference to embodiment.Wherein, attached drawing only for illustration,
What is indicated is only schematic diagram, rather than pictorial diagram, should not be understood as the limitation to this patent；Reality in order to better illustrate the present invention
Example is applied, the certain components of attached drawing have omission, zoom in or out, and do not represent the size of actual product；To those skilled in the art
For, the omitting of some known structures and their instructions in the attached drawings are understandable.
The same or similar label correspond to the same or similar components in the attached drawing of the embodiment of the present invention；It is retouched in of the invention
In stating, it is to be understood that if the orientation or positional relationship for having the instructions such as term " on ", "lower", "left", "right" is based on attached drawing
Shown in orientation or positional relationship, be merely for convenience of description of the present invention and simplification of the description, rather than indication or suggestion is signified
Device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore positional relationship is described in attached drawing
Term only for illustration, should not be understood as the limitation to this patent, for the ordinary skill in the art, can
To understand the concrete meaning of above-mentioned term as the case may be.
Embodiment
Electric current when a kind of LED multi-path of the present embodiment dims distributes control method, includes the following steps:
S1. the received maximum current value of each paths of LEDs energy is obtained respectively, and the maximum current value of each paths of LEDs is less than or equal to each road
The load current value of LED；Obtain the maximum current value Ip that power supply can provide；Ip is greater than individually every paths of LEDs can received maximum electricity
Flow valuve；The received maximum current value of each paths of LEDs energy, root can be obtained according to each paths of LEDs parameter and each LED drive circuit relevant parameter
The maximum current value Ip that power supply can provide can be obtained according to power parameter；
S2. based on the received maximum current value of each paths of LEDs energy and dim signal value, the electric current control of each paths of LEDs is obtained respectively
Koji-making line；The maximum current value Ip and dim signal value that can be provided based on power supply, obtain the current control curve of power supply；Electric current control
Koji-making line is the mapping of dim signal value to electric current accounting, and electric current accounting is the corresponding current value of dim signal value and maximum current
The ratio of value；
S3. when LED multi-path dims, the current control curve based on each paths of LEDs obtains the light modulation for controlling each paths of LEDs respectively
Each road current value is added and obtains total current value Ia by the corresponding each road current value of signal value；
S4. when LED multi-path dims, compare the dim signal value for controlling each paths of LEDs and obtain maximum dimmer letter therein
Number value；Current control curve based on power supply obtains the current value Ib that power supply should export under the maximum dimmer signal value；
S5. compare Ia and Ib；If it is constant to control Ia by Ia≤Ib；If Ia > Ib is controlled under each road current value
Drop, until Ia≤Ib.
Current control curve in step S2, as shown in Figure 1.
Electric current when a kind of LED multi-path light modulation of the invention distributes control method, according to the dim signal of each paths of LEDs of acquisition
Value, can obtain LED actual use number and each road current value, by each road current value be added obtain can add up to current value
Ia can obtain the current value Ib that power supply should export under the maximum dimmer signal value according to maximum dimmer signal value；Pass through
Compare Ia and Ib, the electric current reasonably provided using power supply, due to current value of each paths of LEDs between adjacent dim signal value
Difference very little, therefore even if reducing each road current value, reduction amount be also it is seldom, this send out the electric current of LED and brightness will not
Raw mutation, smooth transition.
In actual use, it is assumed that control two paths of LED light modulation, as there may be following three kinds of shapes for the variation of dim signal value
State:
4) Ia is less than Ib, the dim signal value that this two paths of LED can be obtained with the current control curve based on each paths of LEDs at this time
Corresponding each road current value is dimmed, and brightness can be mentioned as bright as possible；
5) Ia is equal to Ib, the dim signal value that this two paths of LED can be obtained with the current control curve based on each paths of LEDs at this time
Corresponding each road current value is dimmed, and brightness can be mentioned as bright as possible；
6) Ia is greater than Ib, the dim signal that this two paths of LED cannot be obtained with the current control curve based on each paths of LEDs at this time
It is worth corresponding each road current value light modulation, needs to reduce the current value of this two paths of LED, until Ia is less than or equal to Ib, due to each paths of LEDs
Current value difference very little between adjacent dim signal value, therefore even if reducing each road current value, reduction amount is also seldom
, this makes the electric current of LED and brightness not to mutate, smooth transition.
Control three paths of LEDs or more light modulation when, referring to two paths of LED light modulation when the case where.
Wherein, it in step S5, if Ia > Ib, controls each road current value averagely or declines in proportion.It can be according to reality
It needs, suitable ratio is selected to control each road current value decline.
In addition, the current control curve of each paths of LEDs and the current control curve of power supply are counted by formula (1) in step S2
It calculates:
Wherein, IiFor i-th point of current value in the current control curve that is calculated；
IOFor the maximum current value of this current control curve；For each paths of LEDs, IOIt can received maximum electricity for each paths of LEDs
Flow valuve；For power supply, IOThe maximum current value Ip that can be provided for power supply；
DMX is dim signal value, that is, is used to control the DMX numerical value of DMX light modulation, and the numerical value for being 0 to 255；
GAMMA is GAMMA corresponding to the current control curve of corresponding current value formation when DMX changes from 0 to 255
Value, for each paths of LEDs, the numerical value of GAMMA is identical, and the general value of GAMMA is 2.0,2.2,2.4,2.6 or 2.8, and GAMMA value is got over
Small, current control curve is closer to straight line, and GAMMA value is bigger, and current control curve is more bent, and can select according to actual needs
Take suitable GAMMA value.
Now illustrate electric current distribution when control tetra- paths of LEDs of RGBW light modulation: this known four paths of LEDs can received maximum electricity
Flow valuve is respectively IR、IG、IBAnd IW, the maximum current value that power supply can provide is Ip, and it is 0 to 255 that GAMMA value, which is set as 2.2, DMX,
Numerical value；The current value of RGBW and power supply under each DMX numerical value is calculated by formula (1)；Controlling each paths of LEDs light modulation
When, set the DMX value that the DMX value of R paths of LEDs is 140, W paths of LEDs as the DMX value that the DMX value of 100, G paths of LEDs is 120, B paths of LEDs
It is 80, wherein DMX numerical value is maximum is the DMX numerical value of B paths of LEDs, therefore regard the DMX numerical value 140 of B paths of LEDs as control power supply
The dim signal value of electric current；It is I that the current value of R paths of LEDs at this time, which is calculated, by formula (1)R100, the electric current of G paths of LEDs at this time
Value is IG120, the current value of B paths of LEDs at this time is IB140, the current value of W paths of LEDs at this time is IW80, the current value of power supply is IP140；
By IR100、IG120、IB140And IW80Addition obtains total current value IRGBW, compare IRGBWAnd IP140If IRGBW≤IP140, then
IRGBWIt remains unchanged, if IRGBW>IP140, then control IR100、IG120、IB140And Iw80Decline in proportion, it will in the present embodiment
The reduction amount of RGBW is reduced by the proportion of 1:1:1:1, can also be reduced certainly according to the other proportion of actual needs, after reducing
The I newly calculatedRGBW≤IP140。
Obviously, the above embodiment of the present invention be only to clearly illustrate example of the present invention, and not be pair
The restriction of embodiments of the present invention.For those of ordinary skill in the art, may be used also on the basis of the above description
To make other variations or changes in different ways.There is no necessity and possibility to exhaust all the enbodiments.It is all this
Made any modifications, equivalent replacements, and improvements etc., should be included in the claims in the present invention within the spirit and principle of invention
Protection scope within.
Claims (4)
1. electric current when a kind of LED multi-path dims distributes control method, which comprises the steps of:
S1. obtaining each paths of LEDs respectively can received maximum current value；Obtain the maximum current value Ip that power supply can provide；Ip is greater than
Individually every paths of LEDs can received maximum current value；
S2. bent based on the received maximum current value of each paths of LEDs energy and dim signal value, the current control for obtaining each paths of LEDs respectively
Line；The maximum current value Ip and dim signal value that can be provided based on power supply, obtain the current control curve of power supply；Current control is bent
Line is the mapping of dim signal value to electric current accounting, and electric current accounting is the corresponding current value of dim signal value and maximum current value
Ratio；
S3. when LED multi-path dims, the current control curve based on each paths of LEDs obtains the dim signal for controlling each paths of LEDs respectively
It is worth corresponding each road current value, each road current value is added and obtains total current value Ia；
S4. when LED multi-path dims, compare the dim signal value for controlling each paths of LEDs and obtain maximum dimmer signal value therein；
Current control curve based on power supply obtains the current value Ib that power supply should export under the maximum dimmer signal value；
S5. compare Ia and Ib；If it is constant to control Ia by Ia≤Ib；If Ia > Ib, each road current value decline is controlled, directly
To Ia≤Ib.
2. electric current when a kind of LED multi-path according to claim 1 dims distributes control method, which is characterized in that step
In S5, if Ia > Ib, controls each road current value averagely or decline in proportion.
3. electric current when dimming according to claim 1 to a kind of 2 described in any item LED multi-paths distributes control method, feature
It is, in step S2, the current control curve of each paths of LEDs and the current control curve of power supply are calculated by formula (1):
Wherein, IiFor i-th point of current value in the current control curve that is calculated；
IOFor the maximum current value of this current control curve；For each paths of LEDs, IOIt can received maximum current for each paths of LEDs
Value；For power supply, IOThe maximum current value Ip that can be provided for power supply；
DMX is dim signal value, that is, is used to control the DMX numerical value of DMX light modulation, and the numerical value for being 0 to 255；
GAMMA is GAMMA value corresponding to the current control curve of corresponding current value formation when DMX changes from 0 to 255, right
It is identical in the numerical value of each paths of LEDs, GAMMA.
4. electric current when a kind of LED multi-path according to claim 3 dims distributes control method, which is characterized in that step
In S2, GAMMA value is 2.0,2.2,2.4,2.6 or 2.8.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810866665.9A CN109041340B (en) | 2018-08-01 | 2018-08-01 | A kind of electric current when LED multi-path dims distributes control method |
| PCT/CN2019/075195 WO2020024572A1 (en) | 2018-08-01 | 2019-02-15 | Method for controlling current distribution during dimming of multiple leds |
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| CN201810866665.9A CN109041340B (en) | 2018-08-01 | 2018-08-01 | A kind of electric current when LED multi-path dims distributes control method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020024572A1 (en) * | 2018-08-01 | 2020-02-06 | 广州市浩洋电子股份有限公司 | Method for controlling current distribution during dimming of multiple leds |
| CN111511071A (en) * | 2019-01-31 | 2020-08-07 | 松下知识产权经营株式会社 | PWM signal correction method, L ED lighting device |
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| CN103369776A (en) * | 2012-04-10 | 2013-10-23 | 深圳中科光华科技有限公司 | Driving device with a plurality of serially-connected LED circuits connected in parallel and with real-time detection function and constant-current driving method |
| US20170339761A1 (en) * | 2016-05-18 | 2017-11-23 | Avago Technologies General Ip (Singapore) Pte. Ltd. | Dual mode light emitting diode (led) driver |
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| CN102026439B (en) * | 2009-09-23 | 2014-11-05 | 联咏科技股份有限公司 | Driving device and driving method for light emitting diode |
| US9538604B2 (en) * | 2014-12-01 | 2017-01-03 | Hubbell Incorporated | Current splitter for LED lighting system |
| DE102015104973B3 (en) * | 2015-03-31 | 2016-08-18 | Varroc Lighting Systems, s.r.o. | Arrangement and method for driving a plurality of light-emitting diodes arranged in a series circuit |
| CN106851903B (en) * | 2017-01-10 | 2018-10-12 | 深圳市光迹科技有限公司 | The method and system of LED multi-path lamp bead driving are realized using small-power power |
| CN109041340B (en) * | 2018-08-01 | 2019-08-27 | 广州市浩洋电子股份有限公司 | A kind of electric current when LED multi-path dims distributes control method |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103369776A (en) * | 2012-04-10 | 2013-10-23 | 深圳中科光华科技有限公司 | Driving device with a plurality of serially-connected LED circuits connected in parallel and with real-time detection function and constant-current driving method |
| US20170339761A1 (en) * | 2016-05-18 | 2017-11-23 | Avago Technologies General Ip (Singapore) Pte. Ltd. | Dual mode light emitting diode (led) driver |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020024572A1 (en) * | 2018-08-01 | 2020-02-06 | 广州市浩洋电子股份有限公司 | Method for controlling current distribution during dimming of multiple leds |
| CN111511071A (en) * | 2019-01-31 | 2020-08-07 | 松下知识产权经营株式会社 | PWM signal correction method, L ED lighting device |
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| CN109041340B (en) | 2019-08-27 |
| WO2020024572A1 (en) | 2020-02-06 |
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