CN106163024A - A kind of PWM light-dimming method and PWM light modulating device - Google Patents
A kind of PWM light-dimming method and PWM light modulating device Download PDFInfo
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Abstract
The present invention provides a kind of PWM light modulating device, comprising: dim signal interface circuit, receives dim signal；Drive circuit, outputting drive voltage or driving electric current, its work period is Td；Drive power output interface circuit, connect load；Control circuit, described control circuit receives described dim signal from described dim signal interface circuit, generating pwm signal, output to described drive circuit, wherein when PWM light modulation is carried out and lighting apparatus generates the pwm signal of different frequencies to control circuit when normally working.After have employed such light-dimming method so that this PWM light modulating device can the different dimmer switch of compatible light adjusting grade, thus stroboscopic can be prevented effectively from when normal work and occur, can obtain simultaneously and more smooth out soft dimming effect.
Description
Technical field
The present invention relates to a kind of PWM light-dimming method and PWM light modulating device.
Background technology
With the development of the rapid technology of LED, increasing LED light source instead of traditional light source.It is known that LED has many advantages as light source, easily light modulation toning is one of great advantage of LED.With development and the popularization of Internet of Things and Smart Home, dimming light source demand is got more and more, and also more and more higher to the quality requirement of light modulation.So the light regulating technology of LED needs constantly progressive, the advantage of competence exertion self, comply with the development spring tide of Smart Home.
At present, the most frequently used LED dimming mode is PWM light modulation, and its principle is to utilize pwm signal to be controlled Buck/Boost type switching power circuit, according to the dutyfactor value of pwm signal, exports corresponding voltage x current value.The switching frequency of Buck/Boost type Switching Power Supply is higher as shown in Figure 1, typically between tens of Khz to hundreds of Khz.The frequency of PWM typically hundreds of between several Khz, by the High/Low of PWM level control Switching Power Supply first-harmonic electric current on/off.The cycle of pwm signal is generally the integral multiple in switching power circuit cycle, because, if the part Δ t that the PWM pulsewidth PWM HIGH time increases as shown in Figure 1 is placed exactly in the LOW in one cycle of switching power circuit, the increase of so PWM pulsewidth is exactly invalid for output electric current, rear end exports to the electric current of LED unchanged, it is impossible to play the light modulation effect of reality.And in view of the stationary problem of two signals, therefore in existing PWM control program, effective light adjusting grade of PWM is equal to switching power circuit frequency fbDivided by PWM frequency fp(Leff=fb/fp).
Adjusting control circuit in usual lighting apparatus and light modulation interface are corresponding, as, the dimmer switch of the stepping position on metope, the frequency of its light adjusting grade and pwm signal matches, but, as the requirement in people's focus ring border is more and more higher, everybody is it is well recognized that when PWM frequency is low, easily there is stroboscopic in LED light source, when shooting LED light source with picture pick-up device, can be appreciated that obvious ripple.Now a lot of lighting apparatus all improve this state by improving PWM frequency, and change the lighting apparatus after frequency and just cannot mate with original dimmer switch, if it is cumbersome to reinstall corresponding dimmer switch, also can increase the expense expenditure of client.
Content of the invention
The invention aims to solve the problems referred to above, provide a kind of can the PWM light-dimming method of compatible high light adjusting grade dimmer switch, PWM light modulating device.
The present invention is for realizing above-mentioned functions, a kind of PWM light-dimming method of offer is provided, to at least one dimming light sources, turn on drive circuit by the high/low level of pwm signal and to load outputting drive voltage or drive electric current, described pwm signal is pulse signal, it is characterised in that:
When described pwm signal pulsewidth is constant, described light source is in running order, carries out variation to described pwm signal pulsewidth when arranging, and described light source is in dimming state, and when described light source is in running order, the frequency of described pwm signal is operating frequency fW, when described light source is in dimming state, the frequency of described pwm signal is light modulating frequency fP, the pulsewidth of described pwm signal changes at light modulating frequency fPUnder complete.
Preferably, described light modulating frequency fPLess than described operating frequency fW。
Preferably, described control signal is produced by following steps:
Step A receives dim signal, calculates the pwm signal characteristic value of described pwm signal；
Step B by the frequency of described pwm signal from described operating frequency fWBecome described light modulating frequency fp；
Step C changes the described pwm signal characteristic value of described pwm signal；
Step E by the frequency of described pwm signal from described light modulating frequency fpBecome described operating frequency fW。
Preferably, operating frequency f in described step BWProgressively become light modulating frequency f through N stepP, concrete steps are decomposed into:
Step B1 i=1, fP (i)=fW；
Step B2 fP (i)=fP (i)-i*(fW-fP)/N；
Step B3 judges i=N, and equation is set up and terminated, and is false, and i=i+1 simultaneously continues executing with step B2.
Preferably, also having step D before described step E, described step D is a delaying step, is further continued for subsequent step through a time delay T.
Preferably, the choosing value scope of described time delay T is 10 ~ 100ms.
Preferably, the choosing value scope of described time delay T is 20 ~ 50ms.
Preferably, light modulating frequency f in described step EPProgressively become operating frequency f through M stepW, concrete steps are decomposed into:
Step E1 j=1, fP (j)=fP；
Step E2 fP (j)=fP (j)+ j*(fW-fP)/M；
Step E3 judges j=M, and equation is set up and terminated, and is false, and j=j+1 simultaneously continues executing with step B2.
The present invention also provides a kind of PWM light modulating device, comprising:
Dim signal interface circuit, receives dim signal；
Drive circuit, outputting drive voltage or driving electric current, its work period is Td；
Drive power output interface circuit, connect load；
Control circuit, described control circuit receives described dim signal from described dim signal interface circuit, generate pwm signal, output is to described drive circuit, it is characterized in that described control circuit uses aforesaid PWM light-dimming method to generate pwm signal, described control circuit includes that computing module and pwm signal perform module, described computing module calculates pwm signal characteristic value according to described dim signal, and described pwm signal performs module and generates control signal output to described drive circuit according to described pwm signal characteristic value.
Preferably, described control circuit includes:
Computing module receives described dim signal from described dim signal interface circuit, and calculates pwm signal characteristic value according to described dim signal, sends dimmer command；
Frequency control module receives the dimmer command that described computing module sends, and calculates and output frequency signal；
PWM signal generator receives described computing module and calculates the pwm signal characteristic value obtaining and the frequency signal of described frequency control module output, generates described pwm signal, output to described drive circuit.
Preferably, described frequency control module includes frequency generator, and described frequency generator, according to described dimmer command, sends different frequency signal values in the different time, and described frequency signal value is light modulating frequency fPOr operating frequency fW。
Preferably, described frequency control module also includes frequency computing module, described frequency computing module calculates the frequency signal value of each time point according to described dimmer command, and controls described frequency generator and at the appointed time send the frequency signal value corresponding with the described appointment time.
Preferably, described frequency computing module also includes a timer.
Preferably, described control circuit also includes a memory cell, in order to deposit described pwm signal characteristic value.
Preferably, described drive circuit is switching mode circuit.
Preferably, described pwm signal characteristic value is pwm value or dutyfactor value.
Technical scheme provided by the present invention is when PWM light modulation is carried out and lighting apparatus uses different PWM frequency when normally working, make it can the different dimmer switch of compatible light adjusting grade, and stroboscopic can be prevented effectively from when normal work and occur, can obtain simultaneously and more smooth out soft dimming effect.
Brief description
Fig. 1 is the waveform diagram of existing PWM light-dimming method；
Fig. 2 is the structural representation of the PWM light modulating device meeting the preferred embodiment of the present invention；
Fig. 3 is the flow chart of PWM light-dimming method of the present invention.
Detailed description of the invention
A kind of PWM light-dimming method, the PWM light modulating device that propose the present invention below in conjunction with the drawings and specific embodiments are described in further detail.
Refer to Fig. 2, be the structural representation of a preferred embodiment of a kind of PWM light modulating device that the present invention proposes shown in Fig. 2, this PWM light modulating device includes dim signal interface circuit the 1st, control circuit the 2nd, drive circuit the 3rd, drive circuit output interface circuit 4.Dim signal interface circuit 1 receives the dimming control signal transmitting outside and sends control circuit 2 to, is resolved dimming control signal by control circuit 2, and produces control signal and be sent to drive circuit 3.Dimming control signal is produced by all kinds of and that user is mutual interface, mutual interface can be revolving switch, the button of stepping position, remote controller or handheld mobile device, and control signal is by the pwm signal of the particular duty cycle corresponding with dimming control signal, drive circuit 3 is according to the corresponding driving voltage current value of dutyfactor value output of pwm signal, and is exported to corresponding light source by driving power output interface circuit 4.Drive circuit 3 is Buck/Boost type switching power circuit in the present embodiment.Control circuit 2 can be built by some resolution elements and also can be realized by a MCU.Certain complete light modulating device will also include power supply, AC/DC circuit etc. (not shown in Fig. 2), and this can make corresponding configuration according to actual practical situation.
The present invention and the processing method differring primarily in that control circuit of existing light adjusting system.In existing PWM light modulating device, general control circuit is by obtaining PWM duty cycle value to the computing of outside dimming control signal, and PWM signal generator realizes light modulation according to this dutycycle output pwm signal.Such light-dimming method is completely no problem in the case of matching in light adjusting grade and the pwm signal frequency of user interface, but when the light adjusting grade of user interface is more than attainable light adjusting grade, is i.e. more than drive circuit frequency fbWith PWM frequency fpBusiness (Leff=fb/fp), system just cannot realize light modulation smoothly.And the solution of the present invention is to use different PWM frequency in the light modulation stage with normal work stage, in the preferred embodiment of the present invention, drive circuit frequency fbFor 100khz, by prior test, PWM frequency when determining that lighting apparatus normally works, i.e. operating frequency fwFor 4khz, under this PWM frequency, the stroboscopic of light source, the effect of shooting ripple can meet the use demand of client, and when light modulation is carried out, determine PWM frequency i.e. light modulating frequency f according to the light adjusting grade of institute's User Interfacep, because light adjusting grade Leff =fb/fp, our L hereeffValue is 200, such fpIt is equal to 500hz.It is to operationally use higher frequency to avoid stroboscopic in the present embodiment, therefore operating frequency fwMore than light modulating frequency fp.In order to realize such scheme, the structure of control circuit also has to be correspondingly improved, first it is necessary to have a computing module 21 in control circuit, the input of this computing module 21 is dimming control signal, is output as characteristic value and the dimmer command of each pwm signal in the control signal cycle.This pwm signal characteristic value can be expressed as the dutycycle of pwm signal, it is also possible to represents the pulsewidth becoming pwm signal.Control circuit 2 also includes a frequency control module 23, the dimmer command that this frequency control module 23 sends according to computing module 21, calculate and output frequency signal.Other control circuit 2 also has a PWM signal generator 24, PWM signal generator 24 receives described computing module 21 and calculates the pwm signal characteristic value obtaining and the frequency signal of frequency control module 23 output, generating the pwm signal of corresponding frequencies and pulsewidth, output is to drive circuit 3.Computing module 21 can export corresponding pwm signal characteristic value in each pwm signal cycle to PWM signal generator 24, but it is so obviously economical not, therefore in the present embodiment, also include a memory cell 22, computing module 21 only carries out once-through operation when dimming control signal changes detecting, then by operation result write storage unit 22, described memory cell 22 can be a hardware storage device, it is also possible to realized by data structures such as array, stack, queues.
Including frequency of signal generator 2301 at frequency control module 23, frequency of signal generator 2301 can send different frequency signals according to dimmer command, and the frequency signal value that i.e. frequency of signal generator 2301 sends when receiving dimmer command is equal to light modulating frequency fp, and the frequency signal value that frequency of signal generator 2301 sends when not having dimmer command is equal to operating frequency fw.Whole dimming process can be expressed as, and computing module 21 receives dimming control signal, calculates and obtains PWM characteristic value and be simultaneously emitted by dimmer command, and after frequency control module 23 receives dimmer command, it is light modulating frequency f that frequency of signal generator 2301 sends valuepFrequency signal, PWM signal generator 24 receives this frequency signal and new PWM characteristic value, generates the pwm signal of the dutycycle with new calculating, and then dimming cycle terminates, and frequency of signal generator 2301 sends value for operating frequency fwFrequency signal, it is operating frequency f that PWM signal generator 24 then generates frequencyw, pulsewidth keeps the constant pwm signal i.e. with the just now the same dutycycle for new calculating.If only one PWM cycle of dimming cycle here, too short so that the change of brightness cannot be perceived from the point of view of the vision of people on the time, it is therefore desirable to pwm signal maintains light modulating frequency f within a certain period of timepTherefore in frequency control module 23, also include a timer 2 303, filling, to timer 2 303, the time value preset when receiving dimmer command, after timer 2 303 covers the timing of setting, the numerical value of frequency of signal generator 2301 frequency signal is by light modulating frequency fpBecome operating frequency f againw, thus complete the light modulation stage.And this timing choosing value scope is 10 ~ 100ms, preferably 20 ~ 50ms, is 30ms in the present embodiment.Additionally, due to the frequency of pwm signal at light modulating frequency fpWith operating frequency fwChange between the two, and drive circuit output is also a pulse signal, although pwm signal characteristic value keeps constant, after pwm signal and drive circuit Signal averaging, when frequency changes, the voltage x current value of actual output has a small change, is not therefore directly by operating frequency f in the present embodimentwBecome light modulating frequency fp, but another functional module by being arranged in frequency control module 23, frequency computing module 2302, enter line frequency change step by step, PWM frequency is by f i.e. in the present embodimentwGradually reduce to fp(N can be divided to walk, and each step reduces (fw-fp)/N), vice versa, and PWM frequency is at fpRise to fwAlso point multistep realizes (M can be divided into walk).N with M can be identical, it is also possible to different, the value of N or M depends primarily on fwWith fpFrequency distance, if gap little N value can be smaller, single step step-length is preferably 100hz ~ 1000hz, the 400hz of single step value in the present embodiment, thus calculates the value of N.And each step can stay for some time, therefore aforementioned timer 2303 also can be a part of frequency computing module 2302, often completing a timing, frequency computing module 2302 sends a signal to frequency of signal generator 2301, makes it change frequency signal value.
Illustrating with regard to PWM light-dimming method to the present invention of the flow chart of specific embodiment below, Fig. 3 is the flow chart of a preferred embodiment of the present invention, and it includes four basic steps:
Step A receives dim signal, is calculated the pwm signal characteristic value of pwm signal by computing module 21；
Step B by the frequency of pwm signal from operating frequency fWBecome light modulating frequency fp；
Step C changes the pwm signal characteristic value of described pwm signal；
Step E by the frequency of pwm signal from light modulating frequency fpBecome operating frequency fW。
PWM light-dimming method described above is the most basic embodiment of the present invention, i.e. assumes that an existing dim signal transmits, then by computing and export control signal, this is a basic step.But the light modulation demand of user is uncertain in actual applications, running check whether must there is light modulation demand, therefore we this provide to detect and judge step, i.e. step A includes two sub-steps, dimming control signal and current brightness value are compared by i.e. detecting dimming control signal, perform calculation step if any change, unchanged then continuation detects, say, that only just perform calculation step when brightness needs to change.When system is run first, current brightness value is zero, as long as so opening light fixture just to have monochrome information and come hence into calculation step, and carry out follow-up step B successively, and end here is only the end of dimming process after completing step E, just coming back to step A as long as no turning off the light, thus detecting with keeping, the once change of discovery light modulation brightness begins to step B.
And as it was previously stated, operating frequency f in a preferred embodimentWIt is progressively to become light modulating frequency f through N stepP, therefore and as it is shown on figure 3, step B can refine further is decomposed into following steps:
Step B1 i=1, fP (i)=fW；
Step B2 fP (i)=fP (i)-i*(fW-fP)/N；
Step B3 judges i=N, and equation is set up and terminated, and is false, and i=i+1 simultaneously continues executing with step B2.
Step E corresponding with step B is also a process that frequency is changed stepwise, therefore as it is shown on figure 3, step E can refine further is decomposed into following steps:
Step E1 j=1, fP (j)=fP；
Step E2 fP (j)=fP (j)+ j*(fW-fP)/M；
Step E3 judges j=M, and equation is set up and terminated, and is false, and j=j+1 simultaneously continues executing with step B2.
Simultaneously as it was previously stated, after the change completing pwm signal characteristic value, pwm signal can be first at light modulating frequency fpLower holding a period of time, therefore also having step D as shown in Figure 3 before step E, step D is a delaying step, is further continued for subsequent step through a time delay T.
Description of the preferred embodiment of the present invention illustrates that and describes above, it is not intended to limit of the present invention or be confined to disclosed concrete form, obviously, many modifications and variations may be made, these modifications and variations are possibly for being obvious for those skilled in the art, it should include within the scope of the present invention being defined by the appended claims.
Claims (16)
1. a PWM light-dimming method, at least one dimming light sources, turns on drive circuit by the high/low level of pwm signal and to load outputting drive voltage or drives electric current, and described pwm signal is pulse signal, it is characterised in that:
When described pwm signal pulsewidth is constant, described light source is in running order, carries out variation to described pwm signal pulsewidth when arranging, and described light source is in dimming state, and when described light source is in running order, the frequency of described pwm signal is operating frequency fW, when described light source is in dimming state, the frequency of described pwm signal is light modulating frequency fP, the pulsewidth of described pwm signal changes at light modulating frequency fPUnder complete.
2. PWM light-dimming method according to claim 1, it is characterised in that described light modulating frequency fPLess than described operating frequency fW。
3. PWM light-dimming method according to claim 1 and 2, it is characterised in that described control signal is produced by following steps:
Step A receives dim signal, calculates the pwm signal characteristic value of described pwm signal；
Step B by the frequency of described pwm signal from described operating frequency fWBecome described light modulating frequency fp；
Step C changes the described pwm signal characteristic value of described pwm signal；
Step E by the frequency of described pwm signal from described light modulating frequency fpBecome described operating frequency fW。
4. PWM light-dimming method according to claim 3, it is characterised in that operating frequency f in described step BWProgressively become light modulating frequency f through N stepP, concrete steps are decomposed into:
Step B1 i=1, fP (i)=fW；
Step B2 fP (i)=fP (i)-i*(fW-fP)/N；
Step B3 judges i=N, and equation is set up and terminated, and is false, and i=i+1 simultaneously continues executing with step B2.
5. PWM light-dimming method according to claim 3, it is characterised in that also having step D before described step E, described step D is a delaying step, is further continued for subsequent step through a time delay T.
6. PWM light-dimming method according to claim 5, it is characterised in that the choosing value scope of described time delay T is 10 ~ 100ms.
7. PWM light-dimming method according to claim 6, it is characterised in that the choosing value scope of described time delay T is 20 ~ 50ms.
8. PWM light-dimming method according to claim 3, it is characterised in that light modulating frequency f in described step EPProgressively become operating frequency f through M stepW, concrete steps are decomposed into:
Step E1 j=1, fP (j)=fP；
Step E2 fP (j)=fP (j)+ j*(fW-fP)/M；
Step E3 judges j=M, and equation is set up and terminated, and is false, and j=j+1 simultaneously continues executing with step B2.
9. a PWM light modulating device, comprising:
Dim signal interface circuit, receives dim signal；
Drive circuit, outputting drive voltage or driving electric current, its work period is Td；
Drive power output interface circuit, connect load；
Control circuit, described control circuit receives described dim signal from described dim signal interface circuit, generate pwm signal, output is to described drive circuit, it is characterized in that described control circuit uses the arbitrary described PWM light-dimming method of claim 1-8 to generate pwm signal, described control circuit includes that computing module and pwm signal perform module, described computing module calculates pwm signal characteristic value according to described dim signal, and described pwm signal performs module and generates control signal output to described drive circuit according to described pwm signal characteristic value.
10. PWM light modulating device according to claim 9, it is characterised in that described control circuit includes:
Computing module receives described dim signal from described dim signal interface circuit, and calculates pwm signal characteristic value according to described dim signal, sends dimmer command；
Frequency control module receives the dimmer command that described computing module sends, and calculates and output frequency signal；
PWM signal generator receives described computing module and calculates the pwm signal characteristic value obtaining and the frequency signal of described frequency control module output, generates described pwm signal, output to described drive circuit.
11. PWM light modulating devices according to claim 10, it is characterized in that described frequency control module includes frequency generator, described frequency generator, according to described dimmer command, sends different frequency signal values in the different time, and described frequency signal value is light modulating frequency fPOr operating frequency fW。
12. PWM light modulating devices according to claim 11, it is characterized in that described frequency control module also includes frequency computing module, described frequency computing module calculates the frequency signal value of each time point according to described dimmer command, and controls described frequency generator and at the appointed time send the frequency signal value corresponding with the described appointment time.
13. PWM light modulating devices according to claim 12, it is characterised in that described frequency computing module also includes a timer.
14. PWM light modulating devices according to claim 11, it is characterised in that described control circuit also includes a memory cell, in order to deposit described pwm signal characteristic value.
15. PWM light modulating devices according to claim 9, it is characterised in that described drive circuit is switching mode circuit.
The 16. PWM light modulating devices according to claim 9 to 15 is arbitrary, it is characterised in that described pwm signal characteristic value is pwm value or dutyfactor value.
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| CN108184287A (en) * | 2017-12-28 | 2018-06-19 | 大道网络（上海）股份有限公司 | The Intelligent light system and control method and console of a kind of console |
| CN110881234A (en) * | 2019-12-25 | 2020-03-13 | 珠海市圣昌电子有限公司 | Method for realizing non-stroboscopic and non-noise PWM dimming |
| CN111210778A (en) * | 2018-11-22 | 2020-05-29 | 海信视像科技股份有限公司 | Method and device for modulating backlight source driving signal |
| CN113709934A (en) * | 2021-08-26 | 2021-11-26 | 广州彩熠灯光股份有限公司 | Lamp control method and device, lamp and storage medium |
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| CN113709934A (en) * | 2021-08-26 | 2021-11-26 | 广州彩熠灯光股份有限公司 | Lamp control method and device, lamp and storage medium |
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