CN107231728A

CN107231728A - A kind of PWM light modulations toning LED

Info

Publication number: CN107231728A
Application number: CN201710554318.8A
Authority: CN
Inventors: 王品杰
Original assignee: Dongguan Three Grace Lighting Industry Co Ltd
Current assignee: Dongguan Three Grace Lighting Industry Co Ltd
Priority date: 2017-07-10
Filing date: 2017-07-10
Publication date: 2017-10-03

Abstract

A kind of PWM light modulations toning LED, including mobile phone A PP modules, bluetooth communication, digital analog converter, PWM control modules and LED, described LED is RGB LEDs, mobile phone A PP modules and bluetooth communication wireless connection, bluetooth communication connects digital analog converter, digital analog converter connects PWM control modules, PWM control modules connect LED, PWM control modules are by changing color and the brightness of the duty cycle adjustment LED of LED, the present invention is by algorithm chip and circuit can by inputting, corresponding parameter is counter to extrapolate corresponding dutycycle directly by the LED light of needs, in the case where adjusting dutycycle to color, illumination is dynamically adjusted, the advantage of PWM light modulations is that have light modulation more accurate, colors changing hue is faster, the color more beautiful of light modulation, the pattern of light modulation has more color changes than traditional mode, light fixture heating simultaneously is low, it is more efficient.

Description

A kind of PWM light modulations toning LED

Technical field

The present invention relates to field of household appliances, more particularly to a kind of PWM light modulation toning LEDs.

Background technology

Intelligent appliance, exactly introduces microprocessor, sensor technology, the network communications technology family formed after home appliance Electric product, with automatic sensing residence space state and household electrical appliances oneself state, household electrical appliances service state, can automatically control and receive Residential customer is in premises or long-range control instruction；Meanwhile, intelligent appliance, can be with living as the part of smart home Other household electrical appliances and household, facility interconnection composition system, realize smart home function in residence, and which forms one in Internet of Things Individual application most specifically, with mankind's application demand and household electrical appliances are intelligentized continues to develop, its content will more be enriched, and most The intelligent appliance that mankind's daily life can be incorporated is exactly LED lamp, certainly, according to the different intelligent household electrical appliances of actual application environment Function also can difference, but intelligent appliance should typically possess following basic function：Communication function, intelligent program control function, Interactive control etc., most basic homework therein, is exactly wireless control function, in intelligent domestic system and Internet of Things application, LED is also to best embody one of household electrical appliances of intelligent control, remote control, controlled in wireless.

As the rapid advances of photoelectric technology, and attention of the China's Mainland to New Energy Industry are increased, possess environmental protection, section The LED illumination industry of energy characteristic is quickly becoming one of most popular industry, is researched and developed according to China national Semiconductor Lighting And the data display that industry alliance provides, Chinese LED illumination sales Value of Industry increases on year-on-year basis up to 60,000,000,000 yuans within 2009 Long more than 30%, China is turned into one of global LED industry region with fastest developing speed, Chinese LED manufacture strength and manufacture water Why the flat leading role for also playing the part of the whole world, LED can be favored by market or even people, be because its luminance It is very high, 801m/w can be reached, more than 80% can be economized on electricity under identical light situation, largely just served The effect of energy-conservation, the colour temperature of LED has many kinds, and the colour rendering of various colour temperatures is very good, and the index of colour developing is also very high, can To be selected and be allocated according to the usage scenario of terminal user, the EMI of LED meets the index in the whole world, and power factor is more than It is less than or equal to 20% equal to 0.9, two harmonic distortion, the loss of the electric energy of supply circuit can be reduced, reduces the infringement to circuit, Power network will not be polluted, the full voltage range index of LED is between 264V, it ensure that the brightness of LED in 85V Less likely influenceed with service life ratio by voltage pulsation, LED is almost used in the world, LED does not have Without mercury etc. hazardous substance inside radiation, its lamp, safer to human body, LED is pure DC operation, will not be because handing over There is the phenomenon of stroboscopic in stream switching, and this eliminates the need for causing visual fatigue phenomenon because of stroboscopic during light fixture use.

At present, the switch that people are touched on light fixture by using hand carries out the control to light fixture, uses very not square Just, if the control to light fixture can be carried out by the smart mobile phone in people's hand, just it can be brought great convenience to life.Pass through SMS etc. is controlled to light fixture, needs user to pay campus network.

The content of the invention

The present invention is intended to provide a kind of PWM light modulations toning LED.

To realize above-mentioned technical purpose, the present invention uses following technical scheme, a kind of PWM light modulations toning LED, including hand Machine APP modules, bluetooth communication, digital analog converter, PWM control modules and LED, described LED are RGB LEDs, Mobile phone A PP modules and bluetooth communication wireless connection, bluetooth communication connection digital analog converter, digital analog converter connection PWM control modules, PWM control modules connection LED, bluetooth communication is received after mobile phone A PP control signal by number Weighted-voltage D/A converter outputs signal to PWM control modules, and bluetooth communication enters line number using bluetooth hop algorithm and mobile phone A PP modules According to transmission, Bluetooth communication hop algorithm is write into mobile phone A PP and bluetooth communication, to ensure mobile phone A PP and Bluetooth communication The consistent communication module of receiving and sending messages of module can be just in communication with each other, and PWM control modules are by changing the duty cycle adjustment of LED The color of LED and brightness, it is first determined the relation of LED chromaticity coordinates and dutycycle, change driving LED PWM duty cycle, its LED chromaticity coordinates do not change substantially, and luminous flux correspondingly linear change and luminous flux ratio be equal to dutycycle ratio Value, so for the convenience of call for Votes in engineering, luminous flux and dutycycle functional relation in direct ratio are approximately considered, with reference to lattice The graceful blend of colors law in Lars has：

Y_m=D_rY_r+D_gY_g+D_bY_b. (1)；

According to colour mixture principle and cie color computational methods is added, dutycycle distinguishes D_r、D_g、D_bWhen, after light source R, G, B mixed light Chromaticity coordinate is met：

X in formula_m、Y_m、Z_mIt is the tristimulus values for mixing light source M, Y_r、Y_g、Y_bFor the Y thorns under the full current work of light source R, G, B Swash value；C_r=Y_r/y_r、C_g=Y_g/y_g、C_b=Y_b/y_bExpire the tristimulus values sum under current work for light source R, G, B, in CIE- 1931 standard colorimetric system moderate stimulation value Y are equal to luminous flux, under PWM light modulations, and dutycycle is the unique of control LED chromaticity coordinates Factor, if desired luminous flux is Y_m, desired chromaticity coordinate is (x, y), dutycycle as unknown number, then triple channel is accounted for Sky than can convolution (1), (2) try to achieve：

The span of the luminous flux in triangle RGB is [0, Y in theory_r+Y_g+Y_b], but when using PWM light modulations, Luminous flux is constrained by dutycycle, it is impossible to the span on realization theory, in dimming process, the mixing of different chromaticity coordinates Light, the ratio of its RGB three primary colours is different, and only for 1: 1: 1 mixed light, its duty Bizet can reach dutycycle ratio simultaneously 100%, now the span of luminous flux is 0~Y_r+Y_g+Y_b, the luminous flux span of other mixed lights is then less than this model Enclose, every group of chromaticity coordinate has corresponding highlight flux, from practical significance, PWM dutycycle should meet D_r≤ 1, D_g ≤ 1, D_b≤ 1, Y_mAs object function, (3) formula is carried out to deform and can obtain

The luminous flux of mixed light should meet (4)~(6) formula simultaneously, can by further colorimetry and algebraic manipulation Know, when mixed light LED coordinates are located at close to the region of feux rouges, the largest duty cycle of feux rouges, now the light described by (4) formula is logical Measure span minimum, it is expected that luminous flux only needs to meet (4) formula, remaining luminous flux need to only meet (5), (6) respectively Formula, further, since there is clear and definite functional relation with correlated colour temperature Tcp in the chromaticity coordinate of daylight track, can be according to correlation Colour temperature tries to achieve the chromaticity coordinate of correspondence daylight, then by dutycycle and the functional relation of chromaticity coordinate determined by (3) formula, directly The functional relation of dutycycle and correlated colour temperature is set up, the chromaticity coordinate of daylight track has following relation：

In correlated colour temperature T_cpIn the case of known, the chromaticity coordinate of typical daylight can be calculated by following formula.

As 4000K≤T_cpDuring≤7000K：

As 7000K≤T_cpDuring≤25000K：

Correlated colour temperature and luminous flux are set when using, you can corresponding chromaticity coordinate is calculated by (7), (8) formula, then (3) formula, which is substituted into, with reference to expected luminous flux tries to achieve corresponding dutycycle.

Further, the bluetooth communication is directly driven by high voltage power supply, and bluetooth communication is furnished with identifier.

Further, described bluetooth communication uses BK3260 chips.

Further, if desired 4000K correlated colour temperatures, 80lm daylight, corresponding chromaticity is calculated according to (7), (8) formula Coordinate is (0.3823,0.3838), and substituting into (3) formula with reference to expected luminous flux tries to achieve corresponding dutycycle for D_r=68.64%, D_g =83.64%, D_b=14.46%.

The present invention is by algorithm chip and circuit can by inputting, corresponding parameter is counter to be calculated directly by the LED light of needs Go out corresponding dutycycle, color, illumination are dynamically adjusted in the case where adjusting dutycycle, the advantage of PWM light modulations is More accurate with dimming, faster, the color more beautiful of light modulation, the pattern of light modulation have more colors to colors changing hue than traditional mode Change, while light fixture heating is low, it is more efficient.

Brief description of the drawings

Fig. 1 is the schematic diagram of the present invention.

Embodiment

Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning to end Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached The embodiment of figure description is exemplary, is only used for explaining the present invention, and is not considered as limiting the invention.

In the description of the invention, unless otherwise prescribed with limit, it is necessary to explanation, term " installation ", " connected ", " connection " should be interpreted broadly, for example, it may be mechanically connect or electrical connection or the connection of two element internals, can To be to be joined directly together, it can also be indirectly connected to by intermediary.For the ordinary skill in the art, can basis Concrete condition understands the concrete meaning of above-mentioned term.

A kind of PWM light modulation toning LEDs according to embodiments of the present invention, including mobile phone A PP moulds are described referring to Fig. 1 Block, bluetooth communication, digital analog converter, PWM control modules and LED, described LED are RGB LEDs, mobile phone A PP Module and bluetooth communication wireless connection, bluetooth communication connection digital analog converter, digital analog converter connection PWM control moulds Block, PWM control modules connection LED, bluetooth communication receives defeated by digital analog converter after mobile phone A PP control signal Go out signal and give PWM control modules, bluetooth communication is carried out data transmission using bluetooth hop algorithm with mobile phone A PP modules, will Bluetooth communication hop algorithm writes mobile phone A PP and bluetooth communication, to ensure mobile phone A PP and bluetooth communication transmitting-receiving The consistent communication module of information can be just in communication with each other, and PWM control modules are by changing the color of the duty cycle adjustment LED of LED And brightness, it is first determined the relation of LED chromaticity coordinates and dutycycle, change driving LED PWM duty cycle, its LED chromaticity coordinate Substantially do not change, and luminous flux correspondingly linear change and luminous flux ratio be equal to dutycycle ratio, so engineering On for the convenience of call for Votes, luminous flux and dutycycle functional relation in direct ratio are approximately considered, with reference to Jim Glassman color Mixing rule has：

Y_m=D_rY_r+D_gY_g+D_bY_b. (1)；

The span of the luminous flux in triangle RGB is [0, Y in theory_r+Y_g+Y_b], but when using PWM light modulations, Luminous flux is constrained by dutycycle, it is impossible to the span on realization theory, in dimming process, the mixing of different chromaticity coordinates Light, the ratio of its RGB three primary colours is different, and only dutycycle ratio is 1：1：Its duty Bizet of 1 mixed light can reach simultaneously 100%, now the span of luminous flux is 0~Y_r+Y_g+Y_b, the luminous flux span of other mixed lights is then less than this model Enclose, every group of chromaticity coordinate has corresponding highlight flux, from practical significance, PWM dutycycle should meet D_r≤ 1, D_g ≤ 1, D_b≤ 1, Y_mAs object function, (3) formula is carried out to deform and can obtain

As 4000K≤T_cpDuring≤7000K：

As 7000K≤T_cpDuring≤25000K：

Further, described bluetooth communication uses BK3260 chips.

In the description of this specification, the description meaning of reference term " one embodiment ", " example " or " some examples " etc. Refer at least one reality that the present invention is contained in reference to specific features, structure, material or the feature that the embodiment or example are described Apply in example or example.In this manual, identical embodiment is not necessarily referring to the schematic representation of above-mentioned term or shown Example.Moreover, specific features, structure, material or the feature of description can be in any one or more embodiments or example Combine in an appropriate manner.

Although an embodiment of the present invention has been shown and described, it will be understood by those skilled in the art that：Not In the case of departing from the principle and objective of the present invention a variety of change, modification, replacement and modification can be carried out to these embodiments, this The scope of invention is limited by claim and its equivalent.

Claims

1. a kind of PWM light modulations toning LED, it is characterised in that including mobile phone A PP modules, bluetooth communication, digital-to-analogue conversion Device, PWM control modules and LED, described LED is RGB LED lamp, and mobile phone A PP modules wirelessly connect with bluetooth communication Connect, bluetooth communication connection digital analog converter, digital analog converter connection PWM control modules, PWM control modules connection LED, Bluetooth communication outputs signal to PWM control modules, bluetooth after receiving mobile phone A PP control signal by digital analog converter Communication module is carried out data transmission using bluetooth hop algorithm with mobile phone A PP modules, and Bluetooth communication hop algorithm is write into mobile phone APP and bluetooth communication, could be mutually with the consistent communication module of receiving and sending messages for ensuring mobile phone A PP and bluetooth communication Communication, PWM control modules are by changing color and the brightness of the duty cycle adjustment LED of LED, it is first determined LED chromaticities are sat Mark and the relation of dutycycle, change driving LED PWM duty cycle, its LED chromaticity coordinate does not change substantially, and luminous flux Correspondingly the ratio of linear change and luminous flux is equal to the ratio of dutycycle, so for the convenience of call for Votes in engineering, closely Seemingly think luminous flux and dutycycle functional relation in direct ratio, have with reference to Jim Glassman blend of colors law：

Y_m=D_rY_r+D_gY_g+D_bY_b. (1)；

According to colour mixture principle and cie color computational methods is added, dutycycle distinguishes D_r、D_g、D_bWhen, the chromaticity after light source R, G, B mixed light Coordinate is met：

X in formula_m、Y_m、Z_mIt is the tristimulus values for mixing light source M, Y_r、Y_g、Y_bFor the Y values under the full current work of light source R, G, B； C_r=Y_r/y_r、C_g=Y_g/y_g、C_b=Y_b/y_bFor the tristimulus values sum under the full current work of light source R, G, B, marked in CIE-1931 Quasi- colorimeter system moderate stimulation value Y is equal to luminous flux, under PWM light modulations, and dutycycle is the single factor for controlling LED chromaticity coordinates, If desired luminous flux is Y_m, desired chromaticity coordinate is (x, y), dutycycle of the dutycycle as unknown number, then triple channel Can convolution (1), (2) try to achieve：

The span of the luminous flux in triangle RGB is [0, Y in theory_r+Y_g+Y_b], but when using PWM light modulations, light leads to Amount is constrained by dutycycle, it is impossible to the span on realization theory, in dimming process, the mixed light of different chromaticity coordinates, its The ratio of RGB three primary colours is different, and only dutycycle ratio is 1：1：Its duty Bizet of 1 mixed light can reach 100% simultaneously, Now the span of luminous flux is 0~Y_r+Y_g+Y_b, the luminous flux span of other mixed lights is then less than this scope, every group Chromaticity coordinate has corresponding highlight flux, from practical significance, and PWM dutycycle should meet D_r≤ 1, D_g≤ 1, D_b ≤ 1, Y_mAs object function, (3) formula is carried out to deform and can obtain

The luminous flux of mixed light should meet (4)~(6) formula simultaneously, by further colorimetry and algebraic manipulation, when Mixed light LED coordinates be located at close to feux rouges region when, the largest duty cycle of feux rouges, now the luminous flux described by (4) formula take It is worth scope minimum, it is expected that luminous flux only needs to meet (4) formula, remaining luminous flux need to only meet (5), (6) formula respectively i.e. Can, further, since there is clear and definite functional relation with correlated colour temperature Tcp in the chromaticity coordinate of daylight track, can be according to correlated colour temperature The chromaticity coordinate of correspondence daylight is tried to achieve, then by dutycycle and the functional relation of chromaticity coordinate determined by (3) formula, is directly set up The functional relation of dutycycle and correlated colour temperature, the chromaticity coordinate of daylight track has following relation：

In correlated colour temperature T_cpIn the case of known, the chromaticity coordinate of typical daylight can be calculated by following formula

As 4000K≤T_cpDuring≤7000K：

As 7000K≤T_cpDuring≤25000K：

Correlated colour temperature and luminous flux are set when using, you can corresponding chromaticity coordinate is calculated by (7), (8) formula, in conjunction with It is expected that luminous flux, which substitutes into (3) formula, tries to achieve corresponding dutycycle.

2. LED as claimed in claim 1, its is special to be, the bluetooth communication is directly driven by high voltage power supply, Bluetooth communication is furnished with identifier.

3. LED as claimed in claim 1, it is characterised in that described bluetooth communication uses BK3260 chips.

4. LED as claimed in claim 1, it is characterised in that if desired 4000K correlated colour temperatures, 80lm daylight, according to (7), (8) formula calculates corresponding chromaticity coordinate for (0.3823,0.3838), and substituting into (3) formula with reference to expected luminous flux tries to achieve pair The dutycycle answered is D_r=68.64%, D_g=83.64%, D_b=14.46%.