CN112055454B - Method for establishing dimming curve look-up table, dimming method and dimmer - Google Patents
Method for establishing dimming curve look-up table, dimming method and dimmer Download PDFInfo
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- CN112055454B CN112055454B CN202010898617.5A CN202010898617A CN112055454B CN 112055454 B CN112055454 B CN 112055454B CN 202010898617 A CN202010898617 A CN 202010898617A CN 112055454 B CN112055454 B CN 112055454B
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- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
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- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
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- H05B47/165—Controlling the light source following a pre-assigned programmed sequence; Logic control [LC]
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Abstract
The application relates to a method for establishing a dimming curve look-up table, a dimming method and a dimmer, wherein the method comprises the following steps: obtaining a current change curve, and calculating the average current equal division; correcting the current change curve according to the current average equal division to generate a first correction formula; and generating a dimming curve look-up table according to the human eye photosensitive curve and the first correction type curve. The beneficial effect of this application is: the method comprises the steps of establishing a dimming curve data table, obtaining chopping time in a table look-up mode, and outputting commercial power according to the chopping time; the light-emitting device has both the alternating current change characteristic and the light-emitting curve characteristic, and is applied to the silicon controlled dimmer, so that the dimming curve conforms to the linear change of human eyes.
Description
Technical Field
The present disclosure relates to the field of optical technologies, and in particular, to a method for establishing a dimming curve lookup table, a dimming method, and a dimmer.
Background
The existing silicon controlled rectifier dimmer in the market is a traditional dimmer which adjusts a variable resistor so as to change the charging time of a starting capacitor and achieve the chopping purpose; the characteristic that human eyes are insensitive to high brightness change and sensitive to low brightness change is that the brightness change sensed by the human eyes is increased in a logarithmic curve mode in the dimming process, the chopping control is carried out according to an input signal in a time division mode, and the dimming curve is nonlinear for the human eyes and cannot meet the increasing requirement of people on illumination comfort.
Disclosure of Invention
The application aims to solve the problem that in the prior art, chopping control is performed according to an input signal in a time equal division mode, and a dimming curve is nonlinear to human eyes.
A method for building a dimming curve look-up table, the method comprising the steps of:
obtaining a current change curve, and calculating the average current equal division;
correcting the current change curve according to the current average equal division to generate a first correction formula;
and generating a dimming curve look-up table according to the human eye photosensitive curve and the first correction type curve.
Optionally, the obtaining a current variation curve includes:
according to the mains voltage, the current variation curve is in sine periodic variation.
Optionally, the calculating the current average split comprises:
performing constant integral calculation on the current change curve, wherein the constant integral formula is
According to the definite integral formula, equally dividing according to the average area to obtain:
optionally, the first correction formula is:
wherein, it is made
S is the total area in the half period T of the mains power frequency, and the corresponding angle value when n is equally divided is obtained through calculation: α ═ arccos (1-S × N/N) (0 ≦ N. (4).
Optionally, the generating a dimming curve look-up table according to the human eye photosensitive curve and the first correction type curve includes:
acquiring the human eye photosensitive curve, wherein the formula is as follows: x is T (T/T) γ .., (5), wherein gamma is a photosensitive parameter, and the value range of gamma is more than or equal to 1.5 and less than or equal to 2.5; any time T in half period T of mains frequency<The half period of the mains frequency is T;
calculating the ratio of any time T to T in a half cycle T of the commercial power frequency according to the formula (4), wherein T/T is alpha/pi. (6);
and according to the formulas (5) and (6), calculating the corresponding chopping time x according to any time T in the half period T of the mains power frequency to obtain a dimming curve look-up table.
In addition, the present application further provides a dimming method, based on the above dimming curve lookup table, the dimming method includes the following steps:
performing power frequency detection to obtain the current commercial power frequency;
carrying out dimming input detection to obtain a dimming parameter;
calling and inquiring a dimming curve query table according to the dimming parameter and the current mains power frequency to obtain chopping time;
and dimming according to the chopping time.
Optionally, carry out power frequency detection, obtain current commercial power frequency, include:
and measuring the time interval of two zero-crossing points of the current alternating current to obtain the current commercial power frequency.
Optionally, the performing dimming input detection and obtaining the dimming parameter include:
the brightness ratio, i.e., the dimming parameter, input from the outside is acquired through a wired connection or a wireless connection.
Optionally, the calling and querying a dimming curve lookup table according to the dimming parameter and the current mains power frequency to obtain the chopping time includes:
calling a dimming curve look-up table matched with the current mains power frequency according to the current mains power frequency;
and inquiring the dimming curve lookup table according to the dimming parameters to obtain the chopping time.
Optionally, the dimming according to the chopping time includes:
detecting the zero point of the commercial power, and starting chopping timing when the zero point is detected;
and when the chopping timing is equal to the chopping time, chopping is carried out and output.
Optionally, the performing the mains zero point detection includes:
according to the conduction characteristic of the optocoupler, the neighborhood of a critical point of positive and negative half cycle conversion of voltage is identified as a pulse signal, and the central point of the pulse, namely a zero crossing point, is detected.
Optionally, when the chopping timer is equal to the chopping time, performing chopping output:
when the input commercial power is at a zero crossing point, switching off;
and adopting a front-end cutting method, and conducting the input commercial power when the chopping timing is equal to the chopping time.
In addition, the application also provides a dimmer comprising the dimming method, the dimmer comprises a controller, a timer and a memory which are connected with each other,
the memory is used for storing a program for operating the dimming method and a dimming curve look-up table;
the timer is used for chopping timing, starts timing when the zero crossing point of the input commercial power is reached, and is triggered at regular time when the timing reaches chopping time;
and the controller is used for calculating chopping time according to the dimming parameters and controlling the input commercial power to be conducted after timing triggering.
Compared with the prior art, the beneficial effects of this application are: the method comprises the steps of establishing a dimming curve data table, obtaining chopping time in a table look-up mode, and outputting commercial power according to the chopping time; the light-emitting device has both the alternating current change characteristic and the light-emitting curve characteristic, and is applied to the silicon controlled dimmer, so that the dimming curve conforms to the linear change of human eyes. Simultaneously, this application still through automated inspection commercial power frequency, the dimming curve that two kinds of power supply power frequencies of automatic selection correspond further promotes the effect of adjusting luminance.
Drawings
Fig. 1 is a schematic diagram illustrating a method for establishing a dimming curve look-up table according to an embodiment of the present application.
FIG. 2 is a schematic diagram of a 50Hz dimming curve according to an embodiment of the present application.
Fig. 3 is a schematic diagram of a dimming method according to an embodiment of the present application.
Detailed Description
The present application will be further described with reference to the following detailed description.
The same or similar reference numerals in the drawings of the embodiments of the present application correspond to the same or similar components; in the description of the present application, it is to be understood that the terms "upper", "lower", "left", "right", "top", "bottom", "inner", "outer", and the like, if any, are used in the orientations and positional relationships indicated in the drawings only for the convenience of describing the present application and for simplicity of description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore the terms describing the positional relationships in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent.
Furthermore, if the terms "first," "second," and the like are used for descriptive purposes only, they are used for mainly distinguishing different devices, elements or components (the specific types and configurations may be the same or different), and they are not used for indicating or implying relative importance or quantity among the devices, elements or components, but are not to be construed as indicating or implying relative importance.
In the embodiment shown in fig. 1, the present application provides a method for building a dimming curve lookup table, the method comprising the following steps:
100, acquiring a current change curve, and calculating the average equal division of current; in this embodiment, obtaining the current variation curve includes: according to the mains voltage, the current variation curve is in sine periodic variation. Calculating a current average aliquot comprising: the current change curve is subjected to definite integral calculation, and the definite integral formula is
According to a definite integral formula, equally dividing according to the average area to obtain:
200, according to the average equal division of the current, correcting the current change curve to generate a first correction formula; by the formula (1) and the formula (2),
solving a first correction formula as follows:
wherein, it is made
S is the total area in the half period T of the mains power frequency, and the corresponding angle value when n is equally divided is obtained through calculation: α ═ arccos (1-S × N/N) (0 ≦ N. (4).
And 300, generating a dimming curve look-up table according to the human eye photosensitive curve and the first correction type curve. In step 300, a dimming curve look-up table is generated according to the human eye sensitization curve and the first correction type curve, and the dimming curve look-up table comprises: acquiring a human eye photosensitive curve, wherein the formula is as follows: x is T (T/T) γ .., (5), wherein gamma is a photosensitive parameter, and the value range of gamma is more than or equal to 1.5 and less than or equal to 2.5; any time T in half period T of mains power frequency<The half period of the mains frequency is T; calculating the ratio of any time T to T in a half cycle T of the mains power frequency according to a formula (4), wherein T/T is alpha/pi. (6); according to the formulas (5), (6)And obtaining a dimming curve look-up table through chopping time x corresponding to any time T in the half cycle T of the mains power frequency.
In some embodiments, obtaining a current profile comprises: according to the mains voltage, the current variation curve is in sine periodic variation. In the present embodiment, the input current varies with the alternating current of the utility power, and generally the input current varies in a sinusoidal cycle. Calculating a current average aliquot comprising: the current change curve is subjected to definite integral calculation, and the definite integral formula of the current change curve in the (0, pi) interval is
According to a definite integral formula, equally dividing according to the average area to obtain:
in the present embodiment, the duty cycle division of the dimming output is performed according to the present application by dividing the average area equally, wherein the area is equivalent to the output of the power source energy, that is, the unit energy does not increase proportionally with time, but is related to the sinusoidal variation curve.
If the current change linearly increases in unit time, the current change curve should be corrected by adopting an average area equal division mode, and the current change curve is corrected according to the average area equal division mode to generate a first correction formula, wherein the first correction formula is as follows:
wherein, it is made
S is the total area in the half period T of the commercial power frequency, and the corresponding angle value when n is equally divided is calculated: (4) α ═ arccos (1-S × N/N) (0 ≦ N); wherein, S can be the total input energy of the half cycle T of the mains power frequency, and in this embodiment, can be 2.
In some embodiments, generating a dimming curve look-up table from the eye exposure curve and the first correction type curve comprises:
acquiring a human eye photosensitive curve, wherein the formula is as follows: x ═ T (T/T) γ .., (5), wherein gamma is a photosensitive parameter, and the value range of gamma is more than or equal to 1.5 and less than or equal to 2.5; any time T in half period T of mains power frequency<The half period of the mains frequency is T;
calculating the ratio of any time T to T in a half cycle T of the commercial power frequency according to a formula (4), wherein T/T is alpha/pi. (6);
and (4) obtaining a dimming curve look-up table according to the chopping time x corresponding to any time T in the half period T of the mains power frequency according to the formulas (5) and (6).
In this embodiment, the human eye photosensitive curve is preset by the method, the human eye's perception of brightness increases logarithmically with the luminous flux, the luminous flux needs to be compensated for correcting the non-linear perception, and the non-linear change required for the human eye's linear brightness perception is obtained according to the luminous flux and the inverse non-linear characteristic of the human eye's brightness perception γ And calculating, wherein gamma is a light sensing parameter, gamma is more than or equal to 1.5 and less than or equal to 2.5, and gamma is adjusted according to an actual dimmer to select a suitable light sensing parameter, and in the embodiment, gamma can be 2. And (4) according to formulas (5) and (6), obtaining a dimming curve look-up table through chopping time x corresponding to any time T in the half cycle T of the mains power frequency. In addition, according to different frequencies of the input commercial power, the half period of the commercial power frequency is different as T; two types of commercial power which are commonly used internationally are 50Hz and 60Hz, and both are sine alternating current; according to the mains power frequency and the algorithm, the following can be obtained:
constuint8_t dimmingTab50Hz[]＝
{100,99,99,98,97,97,96,96,95,94,94,93,92,92,91,90,
90,89,88,88,87,87,86,85,85,84,83,83,82,81,81,80,
79,79,78,77,77,76,75,74,74,73,72,72,71,70,70,69,
68,67,67,66,65,64,64,63,62,61,61,60,59,58,57,57,
56,55,54,53,52,52,51,50,49,48,47,46,45,44,43,42,
41,40,39,38,37,35,34,33,32,30,29,27,26,24,22,20,
18,16,13,9,0}
const uint8_t dimmingTab60Hz[]＝
{83,78,76,74,72,71,70,69,68,67,66,65,64,64,63,62,
61,61,60,59,59,58,57,57,56,55,55,54,54,53,52,52,
51,51,50,50,49,48,48,47,47,46,46,45,45,44,44,43,
43,42,42,41,40,40,39,39,38,38,37,37,36,36,35,35,
34,33,33,32,32,31,31,30,29,29,28,28,27,26,26,25,
24,24,23,22,22,21,20,19,19,18,17,16,15,14,13,12,
11,9,7,5,0,}
referring to fig. 2, fig. 2 is a schematic diagram of a dimming curve of constuit 8_ t dimming tab50Hz, where table constuit 8_ t dimming tab50Hz is a lookup table of a dimming curve of a 50Hz commercial power, and table constuit 8_ t dimming tab60Hz is a lookup table of a dimming curve of a 60Hz commercial power.
In the embodiment shown in fig. 3, the present application further provides a dimming method, based on the dimming curve lookup table, the dimming method includes the following steps:
400, performing power frequency detection to obtain the current mains power frequency; in step 400, power frequency detection is performed to obtain the current mains power frequency, including: and measuring the time interval of two zero-crossing points of the current alternating current to obtain the current commercial power frequency.
500, dimming input detection is carried out, and dimming parameters are obtained; in step 500, dimming input detection is performed to obtain dimming parameters, including: the brightness ratio, i.e., the dimming parameter, of the external input is acquired through a wired connection or a wireless connection.
600, calling and inquiring a dimming curve look-up table according to the dimming parameters and the current commercial power frequency to obtain chopping time; in step 600, according to the dimming parameter and the current mains power frequency, a dimming curve look-up table is called and queried to obtain the chopping time, which includes: calling a dimming curve look-up table matched with the current commercial power frequency according to the current commercial power frequency; and inquiring a dimming curve inquiry table through the dimming parameters to obtain the chopping time.
Dimming is performed according to the chopping time 700. In step 700, dimming is performed according to a chopping time, comprising: detecting the zero point of the commercial power, and starting chopping timing when the zero point is detected; when the chopping timing is equal to the chopping time, chopping output is performed.
In some embodiments, performing power frequency detection to obtain the current mains power frequency includes: and measuring the time interval of two zero-crossing points of the current alternating current to obtain the current commercial power frequency. In this embodiment, the two mains power frequencies commonly used internationally at present are 50Hz and 60Hz, and both are sinusoidal alternating currents. Different frequencies mean different periods, and the output time of the signal chopped by the silicon controlled rectifier changes correspondingly. Therefore, in order to automatically adapt to the mains supply input in different areas, a power frequency detection mechanism needs to be added. The power frequency detection means is that the current input commercial power frequency can be calculated by measuring the time interval of two zero-crossing points of the alternating current, for example, the time interval of adjacent zero-crossing points of 50Hz is 10 ms.
In some embodiments, performing dimming input detection and obtaining dimming parameters comprises: the brightness ratio, i.e., the dimming parameter, of the external input is acquired through a wired connection or a wireless connection. In this embodiment, the dimming parameter is input through an external device, which may be a switch, a wirelessly connected terminal device, or the like.
In some embodiments, calling and querying a dimming curve lookup table according to the dimming parameter and the current mains power frequency to obtain the chopping time includes:
calling a dimming curve look-up table matched with the current commercial power frequency according to the current commercial power frequency; in this embodiment, after performing power frequency detection and obtaining the current power frequency of the commercial power, according to the current power frequency of the commercial power, the method uses table constutcount 8_ t dimming tab50Hz and table constutcount 8_ t dimming tab60Hz, table constutcount 8_ t dimming tab50Hz as a dimming curve lookup table for which the commercial power is 50Hz, and table constutcount 8_ t dimming tab60Hz as a dimming curve lookup table for which the commercial power is 60 Hz.
And inquiring a dimming curve lookup table through the dimming parameters to obtain the chopping time. In this embodiment, the dimming parameter is a ratio of brightness, and the chopping time is output by looking up the brightness ratio of the table according to the brightness ratio. When the mains frequency is 50Hz, because the dimming brightness is the same as the dimming curve of the dimming curve look-up table, the dimming brightness value is the subscript of the dimming curve look-up table, that is, when the dimming brightness is 50%, the dimming curve look-up table is queried for constant 8_ T dimming tab50Hz [50] ═ 67, and it can be known that the time point of the thyristor conduction is not T/2, but T × 67%; the dimming curve is a straight line formed by connecting the dimming brightness and the absolute value of the difference between each point of the dimming curve look-up table and 100.
In some embodiments, dimming according to chopping time includes: detecting the zero point of the commercial power, and starting chopping timing when the zero point is detected; carrying out commercial power zero point detection, including: according to the conduction characteristic of the optical coupler, the neighborhood of a critical point of positive and negative half-cycle conversion of voltage is identified as a pulse signal, and the central point of the pulse, namely a zero crossing point, is detected. In this embodiment, the magnitude and direction of the alternating current voltage change with time according to a sine function law, and the critical point of the positive and negative half cycle conversion of the voltage is called a zero crossing point. By utilizing the conduction characteristic of the optocoupler device, the neighborhood of the point can be identified as a pulse signal, and ideally, the central point of the pulse is a zero crossing point. The zero crossing point is detected because the zero crossing point is the starting point of the chopping period, timing is started immediately when the zero crossing point is detected, and then the conduction time of the silicon controlled rectifier is controlled according to chopping time information, so that the purpose of chopping is achieved.
And when the chopping timing is equal to the chopping time, chopping output is carried out. In this embodiment, when the chopping timer is equal to the chopping time, chopping output is performed: when the input commercial power is at a zero crossing point, switching off; and adopting a front-end switching method, and conducting the input commercial power when the chopping timing is equal to the chopping time. According to the phase-cut dimming principle of the controllable silicon, when the controllable silicon is switched on, only the zero crossing point of the voltage can be switched off, so that a forward-cut mode, namely, a descending sequence arrangement is adopted for the switching-on time points of a dimming curve look-up table. Assuming that one conduction period T is divided into 100 equal parts, different from the conventional time-halved dimming manner, when the dimming brightness is 50%, according to the dimming curve obtained by the algorithm, the conduction time point of the thyristor is not T/2, but T × 67%. Through correction, the dimming process accords with the linear change of human eye perception, and people feel comfortable. The input commercial power is switched off at the zero-crossing point due to the conduction characteristic of the silicon controlled rectifier, the input commercial power is switched on after the chopping time is reached, the actually input current is 33%, human eyes are sensitive to low brightness, 33% of output brightness better conforms to the linear change of human eyes, and people feel comfortable.
In this embodiment, the present application further provides a dimmer including the dimming method described above. Wherein, the dimmer of the application comprises a controller, a timer and a memory which are connected with each other,
the memory is used for storing a program for operating the dimming method and a dimming curve look-up table;
the timer is used for chopping timing, starts timing when the zero crossing point of the input commercial power is reached, and triggers timing when the timing reaches the chopping time;
and the controller is used for calculating chopping time according to the dimming parameters and controlling the input commercial power to be conducted after timing triggering. The method comprises the steps of establishing a dimming curve data table, obtaining chopping time in a table look-up mode, and outputting commercial power according to the chopping time; the light-emitting device has both the alternating current change characteristic and the light-emitting curve characteristic, and is applied to the silicon controlled dimmer, so that the dimming curve conforms to the linear change of human eyes. Simultaneously, this application still through automated inspection commercial power frequency, the dimming curve that two kinds of power supply power frequencies of automatic selection correspond further promotes the effect of adjusting luminance.
It should be understood that the above examples of the present application are only examples for clearly illustrating the present application, and are not intended to limit the embodiments of the present application. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.
Claims (10)
1. A method for establishing a dimming curve look-up table is characterized by comprising the following steps:
according to the mains voltage, the current change curve changes in a sine periodic mode, and current average halving is calculated according to the current change curve, wherein the calculation of the current average halving comprises the following steps: after the current change curve is subjected to constant integral calculation, dividing equally according to the average area according to the constant integral formula;
according to the average current equal division, correcting the current change curve to generate a first correction formula, wherein the first correction formula is as follows:
wherein, it is made
S is the total area in the half period T of the commercial power frequency, and the corresponding angle value when n is equally divided is calculated: (4) α ═ arccos (1-S × N/N) (0 ≦ N);
acquiring a human eye photosensitive curve, wherein the formula is as follows: x ═ T (T/T) γ .., (5), wherein gamma is a photosensitive parameter, and the value range of gamma is more than or equal to 1.5 and less than or equal to 2.5; any time T in half period T of mains frequency<A half period T of mains power frequency;
calculating the ratio of any time T in the half cycle T of the commercial power frequency to the half cycle T of the commercial power frequency according to the formula (4), wherein T/T is alpha/pi. (6);
and (4) according to the formulas (5) and (6), obtaining a dimming curve look-up table through chopping time x corresponding to any time T in the half period T of the mains power frequency.
2. The method for building a dimming curve look-up table according to claim 1, wherein the calculating the average current halving comprises:
performing constant integral calculation on the current change curve, wherein the constant integral formula is
According to the definite integral formula, equally dividing according to the average area to obtain: i (n) ═
3. A dimming method, characterized in that, based on the dimming curve look-up table of any of claims 1-2, comprising the steps of:
performing power frequency detection to obtain the current commercial power frequency;
carrying out dimming input detection to obtain dimming parameters;
calling and inquiring a dimming curve look-up table according to the dimming parameter and the current mains power frequency to obtain chopping time;
and dimming according to the chopping time.
4. A dimming method according to claim 3, wherein the performing power frequency detection to obtain the current mains power frequency comprises:
and measuring the time interval of two zero-crossing points of the current alternating current to obtain the current commercial power frequency.
5. A dimming method according to claim 3, wherein the performing dimming input detection and obtaining dimming parameters comprises:
the brightness ratio, i.e., the dimming parameter, of the external input is acquired through a wired connection or a wireless connection.
6. A dimming method according to claim 3, wherein the calling and querying a dimming curve lookup table according to the dimming parameter and the current mains power frequency to obtain the chopping time comprises:
calling a dimming curve look-up table matched with the current mains power frequency according to the current mains power frequency;
and inquiring the dimming curve lookup table according to the dimming parameters to obtain the chopping time.
7. A dimming method according to claim 3, wherein dimming according to the chopping time comprises:
detecting the zero point of the commercial power, and starting chopping timing when the zero point is detected;
and when the chopping timing is equal to the chopping time, chopping is carried out and output.
8. A dimming method as claimed in claim 7, wherein the performing of mains zero detection comprises:
according to the conduction characteristic of the optocoupler, the neighborhood of a critical point of positive and negative half cycle conversion of voltage is identified as a pulse signal, and the central point of the pulse, namely a zero crossing point, is detected.
9. A dimming method according to claim 8, wherein when the chopping timer equals to the chopping time, the chopping output is performed:
when the input commercial power is at a zero crossing point, switching off;
and adopting a front-end cutting method, and conducting the input commercial power when the chopping timing is equal to the chopping time.
10. A dimmer, characterized by: a method of dimming comprising any one of claims 3 to 9; the dimmer comprises a controller, a timer and a memory which are connected with each other,
the memory is used for storing a program for operating the dimming method and a dimming curve look-up table;
the timer is used for chopping timing, starts timing when the zero crossing point of the input commercial power is zero, and triggers timing when the timing reaches the chopping time;
and the controller is used for calculating chopping time according to the dimming parameters and controlling the input commercial power to be conducted after timing triggering.
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