CN104936350B - A kind of light-dimming method of LED light emission device - Google Patents
A kind of light-dimming method of LED light emission device Download PDFInfo
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Abstract
The present invention relates to a kind of light-dimming method of LED light emission device, it is characterized in that, the light-dimming method corresponding multiple control signal and controls the multiple control signal at most to have one to be in high level at any one moment respectively by be time-multiplexed control module output and the light source module groups of multiple different colours so that at most all the way outputting drive voltage or electric current drive corresponding to light source module group light.The electric energy that so power supply changeover device is provided is distributed to different branch roads in different time sections successively and used, and the problem of power supply changeover device that power peak stacked tape comes overloads just is not present, thus power supply changeover device power configuration can be reduced to 1/3rd of prior art.The reduction of power supply changeover device power, it is meant that its volume and weight all reduces, thus saves the cost of LED.
Description
The present invention is Application No. 201110272764.2, and the applying date is September in 2011 15, entitled one kind
The divisional application of LED color adjustment driver.
Technical field
The invention belongs to LED control technology field, more specifically, is related to a kind of light modulation side of LED light emission device
Method.
Background technology
LED is as a kind of new light sources of high benefit, due to having the advantages that long lifespan, energy consumption be low, energy-conserving and environment-protective, just extensively
It is general to be applied to the fields such as business, industry, road, advertising lamp box.
With the extensive use of LED, requirement of the people to LED also more and more higher, form from single brightness tune
Save the multiple control modes of color adjustment.Color adjustment use control mode mainly including analog form linearity light adjusting,
PWM (Pulse Width Modulation, the pulse width modulation) light modulations of digital form.
It is not particularly limited in terms of the driving of LED color adjustment, to realize function to be primarily directed toward, typically using common anode
Pole or the structure of common cathode, are powered with constant voltage mode, and the change of its color is controlled with pwm signal.But fixed for light-source structure
Application scenario, mainly with the type of drive of every group of independence constant current, its color change is controlled with PWM.
For pwm signal control carries out the color LED of toning, to avoid the Power convert that power peak stacked tape comes
The problem of device overloads, peak power sum when generally being worked independently using the LED light source module of three kinds of colors is used as LED power supply
The power of converter.But the actual power loss maximum of LED only has 1/3rd or so of power supply changeover device power, such power supply
Converter power configuration by three kinds of color light source module groups work independently when power sum on the basis of, then can cause configure power supply turn
The waste of parallel operation power, meanwhile, also result in that power supply changeover device volume is larger, heavier-weight, cost is of a relatively high.Moreover, generally
In the case of, power supply changeover device is mounted in lamp housing, and only power supply changeover device just occupies the big half space of light fixture so that whole
The volume of LED lamp, weight and cost are all larger.Especially for open air LED lamp (such as street lamp) for, light fixture volume and
The increase of weight has strong influence to the cost of product.Because it is not only to need to spend more materials in preparation process
And human resources, and involved Related product in the installation process in later stage, it is used for example as supporting the lamp stand of light fixture, to this
The strength character requirement of a little products is also high, otherwise can not support the LED lamp of such weight and volume.Also, in platform
The coastal area that wind takes place frequently, the volume and weight of LED lamp cross conference and very big potential safety hazard be present.Therefore, how to obtain small
Type, in light weight, inexpensive power supply changeover device and the mesh for how reaching light modulation to LED using the Miniature Power Unit converter
, it is current urgent problem to be solved.Chinese patent CN 101196276A disclose a kind of program controlled mixed color LED light projector, the hair
Bright technical problem to be solved is how by PWM pulse-width signals to export specific color and bright to adjust LED light group
Degree.Chinese patent CN 201515523U disclose a kind of drive device of LED, and disclose by " waypoint
It is bright " mode is come the problem of transient current is excessive, electromagnetic interference is obvious in circuit caused by reducing traditional LED type of drive, purpose
It is to reduce the transient current in circuit, reduces output power of power supply.Chinese patent CN 102087834A disclose a kind of LED and driven
Dynamic circuit, its technical problem solved are：Reduce the infrastructure cost of scanning display and reduce the measures of scanning display.
Above-mentioned documents without reference to how to be minimized, in light weight, inexpensive power supply changeover device and how using should
Miniature Power Unit converter reaches the purpose problem and related art method of light modulation to LED.
The content of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide one kind to make power supply changeover device power real with LED
The suitable LED color adjustment driver of border power consumption maximum.
To achieve the above object, LED color adjustment driver of the present invention, it is characterised in that including：
One time-division multiplexing control module, time division multiplexing control module have three registers and communication interface, three registers
The turn-on time of red storage, green and blue-light source module is respectively used to, communication interface is connected with toning control circuit, connect
The turn-on time data of the red from toning control circuit, green and blue-light source module are received, for adjusting and updating three
The turn-on time of red, green and blue-light source module that individual register stores, realize the color adjustment of LED；There are three tunnels
Light source module group control signal exports, and corresponds to the control of red, green and blue three colors respectively；
In controlling cycle, light source module group control signal corresponding to first color is changed into high electricity from low level first
It is flat, and turn-on time corresponding to maintenance, then, after light source module group control signal corresponding to first color is changed into low level,
Light source module group control signal corresponding to second color is changed into high level, and turn-on time corresponding to maintenance from low level, most
Afterwards, after light source module group control signal corresponding to second color is changed into low level, by the 3rd light source module group corresponding to color
Control signal is changed into high level, and turn-on time corresponding to maintenance from low level；
One power output module, when light source module group control signal corresponding to a certain color is high level, output driving electricity
Pressure or electric current, light source module group corresponding to driving light；
Time division multiplexing control module, power output module are all connected with power supply changeover device, and power supply changeover device is time division multiplexing
Control module, power output module provide dc source.
What the object of the invention was realized in：
LED color adjustment driver of the present invention is by the control module that is time-multiplexed, by light source die corresponding to three colors
Group control signal is split in the time, makes them at most have one to be in high level, power output mould at any one moment
At most outputting drive voltage or electric current, light source module group corresponding to driving light block all the way, the electricity for so providing power supply changeover device
Different branch roads can be distributed in different time sections to use, the power supply changeover device mistake that power peak stacked tape comes just is not present successively
The problem of load, thus power supply changeover device power configuration can be reduced to 1/3rd of prior art.Power supply changeover device power subtracts
It is small, it is meant that its volume and weight all reduces, thus saves the cost of LED.
Brief description of the drawings
Fig. 1 is a kind of embodiment schematic diagram of LED color adjustment driver of the present invention；
Fig. 2 is a kind of embodiment schematic diagram of time division multiplexing control module shown in Fig. 1；
Fig. 3 is a kind of embodiment theory diagram of power output module shown in Fig. 1；
Fig. 4 is the power output module another kind embodiment theory diagram shown in Fig. 1；
Fig. 5 is timing diagram of the light source module group control signal in the different next instantiations of color state.
Embodiment
The embodiment of the present invention is described below in conjunction with the accompanying drawings, so as to those skilled in the art preferably
Understand the present invention.Requiring particular attention is that in the following description, when known function and the detailed description of design perhaps
When can desalinate the main contents of the present invention, these descriptions will be ignored herein.
Fig. 1 is a kind of embodiment schematic diagram of LED color adjustment driver of the present invention.
In the present embodiment, as shown in figure 1, LED color adjustment driver 2 includes the time division multiplexing He of control module 201
Power output module 202.
Time division multiplexing control module 201 has three tunnel light source module group control signal PMW1, PMW2, PMW3 outputs, corresponds to respectively
The control of red, green and blue three colors.
Power output module 202, when light source module group control signal corresponding to a certain color is high level, output driving electricity
Pressure or electric current, light source module group corresponding to driving light.That is when light source module group control signal PMW1 is high level, its output driving electricity
Pressure or electric current, driving red light source module light；When light source module group control signal PMW2 is high level, its outputting drive voltage or
Electric current, driving green light source module light；When light source module group control signal PMW3 is high level, its outputting drive voltage or electricity
Stream, driving blue-light source module light.
Time division multiplexing control module 201, power output module 202 are all connected with power supply changeover device 1, and power supply changeover device 1 is
Be time-multiplexed control module 201, the offer dc source of power output module 202.In the present embodiment, power supply changeover device 1 includes
AC-DC converter 101 and plug 102；Plug 102 is single-phase three end plug, including zero line L, earth terminal E, zero line side N, is led to
Cross plug-in power pack converter 1 to be connected with power network, obtain AC power.The AC power that AC-DC converter 101 will obtain from power network
Dc source is converted to, and is supplied to time division multiplexing control module 201, power output module 202.The structure of power supply changeover device and
Principle belongs to prior art, will not be repeated here.
Fig. 2 is a kind of embodiment schematic diagram of time division multiplexing control module shown in Fig. 1.
In the present embodiment, as shown in Fig. 2 time division multiplexing control module 201 includes the He of a microprocessing unit (MCU) 2011
Dc-dc 2012；There are three register R1~R3 and communication interface in microprocessing unit 2011, in the present embodiment, lead to
Letter interface is that (Digital Addressable Lighting Interface, the illumination of digital address connect DALI interfaces
Mouthful).
Three register R1~R3 are respectively used to the turn-on time of red storage, green and blue-light source module, communication
Interface connects with toning control circuit, receives the connection of the red from toning control circuit, green and blue-light source module
Time data DATA, red, green and the blue-light source module stored for adjusting and updating three register R1~R3
Turn-on time, realize the color adjustment of LED.
Due in the present embodiment, 1 output of power supply changeover device power supply Vdd all the way, due to its need simultaneously it is defeated to power
Go out module and power supply is provided, its magnitude of voltage is higher, it is therefore desirable to be depressured, to meet wanting for power supply needed for microprocessing unit 2011
Ask, dc-dc 2012 is exactly to be depressured power supply Vdd, then power supply of the output as microprocessing unit 2011.
Fig. 3 is a kind of embodiment theory diagram of power output module shown in Fig. 1.
In the present embodiment, as shown in figure 3, power output module 202 includes three constant-flow driver Q1~Q3, the perseverance
Stream driver Q1~Q3 is respectively provided with PWM dimming interfaces, connected when light source module group control signal is high level all the way for certain
Constant-flow driver have driving current output, and light source module group corresponding to driving lights.Have in addition, constant-flow driver is one
The constant-current supply of open-circuit-protection.
It is light source module group control signal corresponding to red in the present embodiment first by first color in controlling cycle T
PWM1 is changed into high level from low level, and turn-on time t1 corresponding to maintaining, then, in first color, i.e., it is red corresponding to
It is in the present embodiment light source die corresponding to green by second color after light source module group control signal PWM1 is changed into low level
Group control signal PWM2 is changed into high level from low level, and turn-on time t2 corresponding to maintaining, finally, in second color, i.e.,
After light source module group control signal is changed into low level corresponding to green, by the 3rd color, i.e., light source module group control corresponding to blueness
Signal PWM3 is changed into high level, and turn-on time t3 corresponding to maintenance from low level.
As shown in figure 1, time division multiplexing control module 201 exports the nonoverlapping three tunnels light source module group control signal of high level
PWM1~PWM3 signals, when light source module group control signal PWM1 is high level, the driving of constant-flow driver Q1 output driving currents is red
Color light source module lights；When light source module group control signal PWM2 is high level, the driving of constant-flow driver Q2 output driving currents is green
Color light source module lights；When light source module group control signal PWM3 is high level, the driving of constant-flow driver Q3 output driving currents is blue
Color light source module lights, and so as to realize the defeated power of power supply different time sections in controlling cycle T, is distributed via constant-flow driver Q1
Green light source module is assigned to red light source module, via constant-flow driver Q2, is assigned to blueness via constant-flow driver Q3
In light source module group.
By setting turn-on time t1~t3 of red, green and blue-light source module, control light source module group control letter
Number PWM1, PWM2 and PWM3 high level time, realize the regulation of LED color.
In the present embodiment, LED is that a rated power is the color flat lamp of 20W tonings, and light source part is by 14 strings 24
0.06W and red simple grain composition red light source module, 14 string 24 0.06W and green simple grain composition green light source module and
The blue-light source module of 14 24 0.06W of string and blue simple grain composition is formed, and the light source module group of three colors is each using independent
Loop connects.
Fig. 4 is the power output module another kind embodiment theory diagram shown in Fig. 1.
In the present embodiment, as shown in figure 3, power output module 202 includes a constant-flow driver 2021 and three
Switching tube K1~K3, constant-flow driver 202 be one have open-circuit-protection constant-current supply, three switching tube K1~K3 respectively with
Light source module group D1~D3 series connection of respective corresponding color, then it is all connected to the output end of constant-flow driver 2021, three road light sources
Module control signal PWM1, PWM2 and PWM3 are coupled with switching tube K1~K3 of corresponding color control terminal, when certain light all the way
When source module control signal is high level, connected switching tube conducting, constant-flow driver has output to pass through the switching tube
Light source module group lights corresponding to driving.This mode, relative to the power output module shown in Fig. 3, it needs a constant current
Driver, such cost are greatly lowered.
Fig. 5 is timing diagram of the light source module group control signal in the different next instantiations of color state.
In the present embodiment, as shown in figure 5, (a)~(f) be light source module group control signal in different color states, i.e.,
White high bright, white half are bright, purple is highlighted, purple half is bright, red highlighted, the bright lower time division multiplexing control module output of red half
Light source module group control signal PWM1, PWM2 and PWM3 signal timing diagram.Wherein, turn-on time t1 corresponding light sources module control signal
PWM1 high level times, turn-on time t2 corresponding light source module control signal PWM2 high level times, turn-on time, t3 was to PWM3
High level time, wherein T=4ms are PWM cycle.
Fig. 5 (a) show white high bright state time division multiplexing module timing diagram, t1=4/3ms, t2=4/3ms, t3=4/
3ms, t1+t2+t3=T, constant-flow driver Q1~Q3 power output sums are about 20W, red light source module, green light source module
Worked with blue-light source module with 1/3 power, the power consumption of the light source module group of each color is 6.67W.
Fig. 5 (b) show white half bright state time division multiplexing module timing diagram, t1=2/3ms, t2=2/3ms, t3=2/
3ms, t1+t2+t3=T/2, constant-flow driver Q1~Q3 power output sums are about 10W, red light source module, green light source mould
Group and blue-light source module are worked with 1/6 power, and the power consumption of the light source module group of each color is 3.33W.In addition, in control
Between in T, uniform intervals between each light source module group control signal PWM1~PWM3 high level, so can further keep electricity
The stationarity of the power output of source converter 1.
Fig. 5 (c) show purple highlighted state time division multiplexing module timing diagram, t1=2ms, t2=0ms, t3=2ms, t1
+ t2+t3=T, constant-flow driver Q1, Q3 power output sum are about 20W, and red light source module and blue-light source module are with half
Power works, i.e., power consumption is 10W, and green light source module does not work.
Fig. 5 (d) show purple half bright state time division multiplexing module timing diagram, t1=1ms, t2=0ms, t3=1ms, t1
+ t2+t3=T/2, constant-flow driver Q1, Q3 power output sum are about 10W, red light source module and blue-light source module with
1/4 power works, i.e., power consumption is 5W, and green light source module does not work.
Fig. 5 (e) show red highlighted state time division multiplexing module timing diagram, t1=4ms, t2=0ms, t3=0ms, t1
+ t2+t3=T, constant-flow driver Q1 power outputs are about 20W, and red light source module is 20W with full power operation, i.e. power consumption, and
Green light source module and blue-light source module do not work.
Fig. 5 (f) show red half bright state time division multiplexing timing diagram, t1=2ms, t2=0ms, t3=0ms, t1+t2+
T3=T/2, constant-flow driver Q1 power output about 10W, red light source module are worked with half-power, i.e., power consumption is 10W, and green
Light source module group and blue-light source module do not work.
The example of 6 color adjustments is presented above, other color states can be by adjusting light source module group control signal
PWM1, PWM2 and PWM3 high level time, i.e.,：Change turn-on time t1, t2 and t3, control red light source module, green light
Source module and blue-light source module luminous power, so as to which colour mixture is into different color state.Regulation for a certain color, keeping
In the case that brightness is constant, change turn-on time t1, t2 and t3, but t1, t2 and t3 sum maintain a definite value.
Meanwhile as long as the peak power that Fig. 5 can be seen that LED determines, the peak power of each light source module group is also just true
It is fixed, and the peak power of LED is identical, because high-high brightness during high-high brightness and three-colour light-emitting when monochromatic luminous should
When consistent, not so during color adjustment, it may occur that luminance transformation.
In the present embodiment, if using traditional type of drive, it may appear that light source module group control signal PWM1, PWM2 and
PWM3 is high level, the situation of power peak superposition, now needs to configure 60W power supply changeover device.And use the present invention's
Scheme, power supply changeover device power are 1/3rd of traditional scheme.Further, since be not in the situation of power peak superposition,
Power output is also more steady.
In the present embodiment, as shown in figure 5, in control time T, each light source module group control signal PWM1~PWM3's
Uniform intervals between high level, it so can further keep the stationarity of the power output of power supply changeover device 1.
Light source module group control signal pwm signal of the present invention uses positive logic, is effective using high level, controls power
Output module exports, and the light source module group of three colors of driving lights, and the present invention can also use negative logic, or mixed logic to mix
The mode of conjunction, realize the complementary control of power output peak value.
Although the illustrative embodiment of the present invention is described above, in order to the technology of the art
Personnel understand the present invention, it should be apparent that the invention is not restricted to the scope of embodiment, to the common skill of the art
For art personnel, if various change in the spirit and scope of the present invention that appended claim limits and determines, these
Change is it will be apparent that all utilize the innovation and creation of present inventive concept in the row of protection.
Claims (1)
1. a kind of light-dimming method of LED light emission device, it is characterised in that the light-dimming method is defeated by the control module that is time-multiplexed
Go out and corresponding multiple control signal and control the multiple control signal any respectively with the light source module group of multiple different colours
One moment at most has one to be in high level so that at most all the way outputting drive voltage or electric current driving corresponding to light source module group
It is luminous；
Wherein, the LED light emission device includes red, green and blue-light source module, power output module and time division multiplexing
Control module,
The light-dimming method is exported by the control module that is time-multiplexed and the red, green and blue-light source module are corresponding respectively
The first light source module group control signal, secondary light source module control signal and the 3rd light source module group control signal and control described
One light source module group control signal, the secondary light source module control signal and the 3rd light source module group control signal are any one
The individual moment at most has one to be in high level so that the power output module at most outputting drive voltage or electric current all the way, from
And light source module group corresponding to driving lights；
The time division multiplexing control module, the power output module are all connected with power supply changeover device, and power supply changeover device is the time-division
Multiplexing control module, power output module provide dc source, so as to LED peak power determine and it is identical, then it is described red
Color, green, the peak power of blue-light source module are identical, ensure that monochromatic luminous high-high brightness is sent out with three colors in color adjustment
The high-high brightness of light is consistent；
It is described time division multiplexing control module by the first light source module group control signal, the secondary light source module control signal and
The 3rd light source module group control signal is split in time, by adjusting the red, green and blue-light source module
Turn-on time adjust the first light source module group control signal, the secondary light source module control signal and the 3rd light
The high level time of source module control signal, and then realize the regulation of LED light emission device color；
The turn-on time sum of red, the described green and described blue-light source module maintains a definite value；
Turn-on time t1 corresponds to the first light source module group control signal high level time, and turn-on time t2 corresponds to second light
Source module control signal high level time, turn-on time t3 correspond to the 3rd light source module group control signal high level time, T=
4ms is PWM cycle, wherein,
T1=4/3ms, t2=4/3ms, t3=4/3ms, and t1+t2+t3=T, it is now white high bright state, the red light
Source module, green light source module and blue-light source module are worked with 1/3 power, or t1=2ms, t2=0ms, t3=2ms, and
T1+t2+t3=T, it is now purple highlighted state, the red light source module and blue-light source module are worked with half-power,
Green light source module does not work, or t1=4ms, t2=0ms, t3=0ms, and t1+t2+t3=T, is now the highlighted shape of red
State, the red light source module are not worked with full power operation, green light source module and blue-light source module；
Also,
T1=2/3ms, t2=2/3ms, t3=2/3ms, and t1+t2+t3=T/2, it is now white half bright state, the red
Light source module group, green light source module and blue-light source module are worked with 1/6 power, or t1=1ms, t2=0, t3=1ms, and
T1+t2+t3=T/2, it is now purple half bright state, the red light source module and blue-light source module are with 1/4 power work
Make, green light source module does not work, or t1=2ms, t2=0, t3=0, and t1+t2+t3=T/2, is now red half bright shape
State, the red light source module are worked with half-power, and green light source module and blue-light source module do not work；
In controlling cycle, the first light source module group control signal, the secondary light source module control signal and the described 3rd
It is evenly spaced between the high level of light source module group control signal；
Three registers of the time division multiplexing control module store the connection of the red, green and blue-light source module respectively
Time, the communication interface of the time division multiplexing control module connect with toning control circuit, receive from the toning control electricity
Red, described green and the blue-light source module the turn-on time data on road, and for adjusting and updating three
The turn-on time of red, green and blue-light source module that register stores, realize the color adjustment of LED；
In controlling cycle, light source module group control signal corresponding to first color is changed into high level from low level first, and
Turn-on time corresponding to maintenance, then after light source module group control signal is changed into low level corresponding to the first color, by second
Light source module group control signal corresponding to color is changed into high level, and turn-on time corresponding to maintenance from low level, finally second
After light source module group control signal is changed into low level corresponding to individual color, by the 3rd light source module group control signal corresponding to color from
Low level is changed into high level, and turn-on time corresponding to maintenance；
The power output module includes three constant-flow drivers, wherein
When the first light source module group control signal is high level, the first constant-flow driver output driving current driving red light source
Module lights；When the secondary light source module control signal is high level, the driving of the second constant-flow driver output driving current is green
Color light source module lights；When the 3rd light source module group control signal is high level, the 3rd constant-flow driver output driving current
Driving blue-light source module lights；So as to realize that voltage output power different periods in controlling cycle drive via the first constant current
Device is assigned to red light source module, the second constant-flow driver is assigned to green light source module, the 3rd constant-flow driver is assigned to indigo plant
Color light source module.
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| CN201510353103.0A CN104936350B (en) | 2011-09-15 | 2011-09-15 | A kind of light-dimming method of LED light emission device |
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| CN201510353103.0A CN104936350B (en) | 2011-09-15 | 2011-09-15 | A kind of light-dimming method of LED light emission device |
| CN201110272764.2A CN102421230B (en) | 2011-09-15 | 2011-09-15 | A kind of LED color adjustment driver |
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| CN103179757B (en) * | 2013-03-25 | 2015-07-08 | 浙江海振电子科技有限公司 | Time-sharing multi-path constant current driving light emitting diode (LED) lamp |
| CN103634986B (en) * | 2013-11-04 | 2016-10-19 | 惠州雷士光电科技有限公司 | Multichannel light modulating device and light-dimming method thereof |
| CN103874310A (en) * | 2014-04-10 | 2014-06-18 | 浙江省能源与核技术应用研究院 | Method for improving LED visual illuminating effect and lowering heating of LED lamp |
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Also Published As
| Publication number | Publication date |
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| CN102421230B (en) | 2015-08-05 |
| CN104936350A (en) | 2015-09-23 |
| CN102421230A (en) | 2012-04-18 |
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