CN117295206A - Constant brightness constant power color mixing control method and lamp - Google Patents
Constant brightness constant power color mixing control method and lamp Download PDFInfo
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Abstract
The application discloses a constant-brightness constant-power color mixing control method and a lamp. The constant-brightness constant-power color mixing control method provides a light color mixing scheme which can keep the total brightness of light basically unchanged in the color mixing process, and is suitable for being used in scene lighting applications. Specifically, the constant-brightness constant-power color mixing control method comprises the following steps: obtaining the maximum brightness of each primary color light source in the lamp; acquiring brightness adjustment coefficients of all primary color light sources based on the maximum brightness of all primary color light sources in the lamp; receiving a color mixing parameter of at least one primary color light source corresponding to an input instruction; determining dynamic adjustment coefficients corresponding to all primary color light sources based on the color mixing parameters of at least one primary color light source corresponding to the input instruction; determining the duty ratio of dynamic pulse width modulation of each primary light source based on the dynamic adjustment coefficient corresponding to each primary light source and the brightness adjustment coefficient of each primary light source; and outputting a modulation pulse width time sequence to the drivers corresponding to the primary color light sources in a serial conduction mode.
Description
Technical Field
The application relates to the field of artificial light color matching, in particular to a constant-brightness constant-power color matching control method and a lamp.
Background
Artificial light has become an integral part of people's life. With the continuous research and development of artificial light, the artificial light has been widely used in the fields of daily lighting, medical treatment, light curing, and the like.
It should be noted that the light form, the light color, the relationship between light and shadow, etc. may be reshaped in practical applications. For example, in scene lighting, scene blending is required to dynamically dim and tone; the light existence state can be remodeled by fully utilizing the front lighting control technology in the digital technology. For example, static light is tuned to be dynamic. Therefore, the expressive force and artistic creativity of light can be fully mobilized by using the controllable system, the scene with the plot and drama space theme is reproduced, and the more artistic appeal and space scene are reflected.
However, the prior art toning has some problems. In particular, the prior art tinting is mainly performed using a single color independent superposition method. For example, in a scene, currently red, if it is to be changed to yellow, the dimmer will increase the brightness of the green light to mix into yellow. However, the brightness of the light of each color is superimposed, and increasing the brightness of the green light results in a significant change in the overall brightness of the light in the scene. Similarly, when the other colors of lights are mixed, the brightness of one or more colors of lights in RGB is changed, so that the whole mixed brightness is difficult to be unchanged.
Accordingly, the human eye may not adapt when the overall brightness of the lamp light changes during tinting by the prior art. For example, when a person enters a bright environment from a dark environment, the pupil of the human eye is contracted to reduce the light energy injected into the eye; the person will feel that the eyes are not open and see the object. Likewise, when a person enters a dark environment from a bright environment, the pupil of the human eye dilates to increase the light energy injected into the eye, and the person is also unadapted to see no surrounding objects. These two processes are called light adaptation and dark adaptation, respectively, and typically take about 1 minute to adapt.
Therefore, there is a need to develop a tinting scheme that does not change brightness during tinting to accommodate the scene lighting dynamic tinting needs.
Disclosure of Invention
An advantage of the present application is that a constant brightness constant power tinting control method and luminaire are provided, wherein the constant brightness constant power tinting control method provides a light tinting scheme that is capable of maintaining the overall brightness of the light substantially unchanged during tinting, suitable for use in a scene lighting application.
The application provides a constant-brightness constant-power color mixing control method and a lamp, wherein the total brightness of the light can be maintained unchanged basically in the color mixing process due to the light color mixing scheme, so that the human eyes can feel more comfortable and natural in the process of switching the light colors. In this way, the human eye comfort can be greatly optimized while guaranteeing atmosphere rendering and artistic appeal in scene lighting through light transformation.
Still another advantage of the present application is to provide a constant brightness constant power color mixing control method and a lamp, where the light color mixing scheme of the present application can implement global dynamic color mixing, and perform linkage dimming in the color mixing process, that is, correlate the lights of the primary colors with each other, and perform dimming by using the correlation between the lights of the primary colors, so that not only can the total brightness of the light be maintained in the color mixing process, but also the user adjustment trend can be perceived, and the primary colors are coordinated to be strong and weak in the adjustment process, and the user is assisted to wave and wave, so that the user shortens the "stroke" in the adjustment process.
Still another advantage of the present application is to provide a constant brightness and constant power color mixing control method and a lamp, where the light color mixing scheme of the present application not only can maintain the total brightness of the light to be substantially unchanged in the color mixing process, but also can maintain the output power to be substantially unchanged, so that the power supply is efficiently utilized, and the cost is reduced to a certain extent.
According to an aspect of the present application, there is provided a constant-luminance constant-power toning control method including: obtaining the maximum brightness of each primary color light source in the lamp; acquiring brightness adjustment coefficients of all primary color light sources based on the maximum brightness of all primary color light sources in the lamp; receiving a color mixing parameter of at least one primary color light source corresponding to an input instruction; determining dynamic adjustment coefficients corresponding to all primary color light sources based on the color mixing parameters of at least one primary color light source corresponding to the input instruction; determining the duty ratio of dynamic pulse width modulation of each primary light source based on the dynamic adjustment coefficient corresponding to each primary light source and the brightness adjustment coefficient of each primary light source; and outputting a modulation pulse width time sequence to the drivers corresponding to the primary color light sources in a serial conduction mode.
In an embodiment of the constant brightness and constant power color mixing control method according to the present application, obtaining the maximum brightness of each primary color light source in the lamp includes: respectively placing each primary color light source in a black room, and measuring the maximum brightness of each primary color light sourceWherein->The value of (2) is an integer greater than or equal to 1, ">Representing the primary colors.
In an embodiment of the constant brightness constant power color mixing control method according to the present application, the obtaining the brightness adjustment coefficient of each primary light source based on the maximum brightness of each primary light source in the lamp includes: calculating brightness adjustment coefficients of the primary color light sources by the following relation:the method comprises the steps of carrying out a first treatment on the surface of the Wherein (1)>A brightness adjustment coefficient representing each primary color light source;；/>representing the minimum value operation,/->The value of (2) is an integer greater than or equal to 1, ">Representing the primary colors.
In one embodiment of the constant brightness constant power color mixing control method according to the present applicationWherein, determining the dynamic adjustment coefficient corresponding to each primary color light source based on the color mixing parameter of at least one primary color light source corresponding to the input instruction comprises: calculating the dynamic adjustment coefficient corresponding to each primary color light source by the following relation:the method comprises the steps of carrying out a first treatment on the surface of the Wherein (1)>A brightness adjustment coefficient representing each primary color light source; />；/>The value of (2) is an integer greater than or equal to 1, ">Representing the primary color->And the color mixing parameters of the primary color light sources corresponding to the input instruction are represented.
In one embodiment of the constant brightness constant power color mixing control method according to the present application, determining a duty ratio of dynamic pulse width modulation of each primary light source based on a dynamic adjustment coefficient corresponding to each primary light source and a brightness adjustment coefficient of each primary light source includes: the duty cycle of the dynamic pulse width modulation of each primary light source is calculated by the following relation:the method comprises the steps of carrying out a first treatment on the surface of the Wherein,a brightness adjustment coefficient representing each primary color light source; />；/>The value of (2) is an integer greater than or equal to 1, ">Representing the primary colors.
In an embodiment of the constant brightness and constant power color mixing control method according to the present application, the outputting of the modulation pulse width timing to the driver corresponding to each primary color light source in a serial conduction mode includes: the output timing is converted by the following relation:the method comprises the steps of carrying out a first treatment on the surface of the Wherein (1)>Representing the corresponding period on-time of each primary light source, < >>Representing the period closing time corresponding to each primary color; />Indicating the set period.
In one embodiment of the constant brightness constant power toning control method according to the present application,500 microseconds.
According to another aspect of the present application, another constant brightness constant power toning control method is provided, which includes: modulating the pulse width of one primary light based on the input instruction; and modulating the pulse widths of the other primary lights in linkage based on the modulation of the pulse widths of the primary lights so that the sum of the pulse widths of all the primary lights is kept at a constant value.
According to yet another aspect of the present application, a luminaire comprises: a plurality of primary color light sources; the controller is connected with the primary color light sources and is used for obtaining the maximum brightness of each primary color light source in the lamp; acquiring brightness adjustment coefficients of all primary color light sources based on the maximum brightness of all primary color light sources in the lamp; receiving a color mixing parameter of at least one primary color light source corresponding to an input instruction; determining dynamic adjustment coefficients corresponding to all primary color light sources based on the color mixing parameters of at least one primary color light source corresponding to the input instruction; determining the duty ratio of dynamic pulse width modulation of each primary light source based on the dynamic adjustment coefficient corresponding to each primary light source and the brightness adjustment coefficient of each primary light source; and outputting a modulation pulse width time sequence to the drivers corresponding to the primary color light sources in a serial conduction mode.
According to yet another aspect of the present application, a luminaire comprises: a plurality of primary color light sources; and a controller connected to a plurality of the primary light sources, the controller for modulating a pulse width of one primary light based on an input instruction; and modulating the pulse widths of the other primary lights in linkage based on the modulation of the pulse widths of the primary lights so that the sum of the pulse widths of all the primary lights is kept at a constant value.
According to yet another aspect of the application, the luminaire operates with a constant brightness constant power tinting control method as described above.
Further objects and advantages of the present application will become fully apparent from the following description and the accompanying drawings.
These and other objects, features, and advantages of the present application will become more fully apparent from the following detailed description, the accompanying drawings, and the appended claims.
Drawings
The foregoing and other objects, features and advantages of the present application will become more apparent from the following more particular description of embodiments of the present application, as illustrated in the accompanying drawings. The accompanying drawings are included to provide a further understanding of embodiments of the application and are incorporated in and constitute a part of this specification, illustrate the application and not constitute a limitation to the application. In the drawings, like reference numerals generally refer to like parts or steps.
Fig. 1 illustrates the manner in which light of the individual primary colors is controlled in a prior art color mixing scheme.
Fig. 2 illustrates a flow chart of a constant brightness constant power toning control method according to an embodiment of the present application.
Fig. 3 illustrates a schematic diagram of a color mixing principle of a constant brightness constant power color mixing control method according to an embodiment of the present application.
Fig. 4 illustrates a schematic diagram of the toning principle of a hypothetical toning scheme.
Fig. 5 illustrates a flow chart of another constant brightness constant power toning control method according to an embodiment of the present application.
Fig. 6 illustrates a schematic diagram of a toning principle of another constant brightness constant power toning control method according to an embodiment of the present application.
Fig. 7 illustrates a schematic block diagram of a luminaire according to an embodiment of the present application.
Detailed Description
Hereinafter, example embodiments according to the present application will be described in detail with reference to the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application and not all of the embodiments of the present application, and it should be understood that the present application is not limited by the example embodiments described herein.
It will be understood that the terms "a" and "an" should be interpreted as referring to "at least one" or "one or more," i.e., in one embodiment, the number of elements may be one, while in another embodiment, the number of elements may be plural, and the term "a" should not be interpreted as limiting the number. "plurality" means two or more.
Although ordinal numbers such as "first," "second," etc., will be used to describe various components, those components are not limited herein. The term is used merely to distinguish one component from another. For example, a first component may be referred to as a second component, and likewise, a second component may be referred to as a first component, without departing from the teachings of the present application. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
The terminology used herein is for the purpose of describing various embodiments only and is not intended to be limiting. As used herein, the singular is intended to include the plural unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, or groups thereof.
Summary of the application: as described above, the prior art toning mainly uses a single-color independent superposition method for toning. For example, in a scene, currently red, if it is to be changed to yellow, the dimmer will increase the brightness of the green light to mix into yellow. However, the brightness of the light of each color is superimposed, and increasing the brightness of the green light results in a significant change in the overall brightness of the light in the scene. Similarly, when the other colors of lights are mixed, the brightness of one or more colors of lights in RGB is changed, so that the whole mixed brightness is difficult to be unchanged.
Accordingly, the human eye may not adapt when the overall brightness of the lamp light changes during tinting by the prior art.
The inventors of the present application analyzed the color mixing mechanism of the prior art and found that the light control of the individual primary colors (i.e., red, green, blue) was independent and uncorrelated when the prior art luminaire was RGB-mixed. The user freely adjusts the brightness level of the light of each primary color, and then converts the light into a pulse wave after PWM (Pulse Width Modulation ) of each primary color and outputs the pulse wave to the driver to control color mixing, as shown in fig. 1 below. This control results in a different overall brightness after each color mixture.
Accordingly, the inventors of the present application propose to perform independent PWM adjustment of the light of each primary color to perform coordinated PWM adjustment of the light of each primary color. As shown in fig. 3, the light of 3 primary colors is distributed into a fixed period T.
When the primary color R, i.e. red light, is dimmed, the point a moves to the left in the figure to the target position, assuming that the displacement of the point a is s 1 The position b in the graph is dynamically adjusted accordingly; alternatively, when the primary color R, i.e., red light, is turned on, the point a moves rightward in the figure to the target position, assuming that the displacement of the point a is s 1 The position b in the figure is dynamically adjusted accordingly. The position of the point b is adjusted by the method of s 1 The original PMW pulse width size is scaled according to the primary color G, i.e., green light, and the primary color B, i.e., blue light.
When dimmingWhen the primary color G, i.e. green light, is moved rightward to the target position in the figure, and the point b is moved leftward to the target position, assuming that the total displacement of the points a and b is s 2 The method comprises the steps of carrying out a first treatment on the surface of the Alternatively, when the primary color G, i.e., green light, is turned on, point a moves to the left in the figure to its target position, point b moves to the right to its target position, assuming that the total displacement of points a and b is s 2 The method comprises the steps of carrying out a first treatment on the surface of the The adjustment mode of the position of the point a and the position of the point b is that s is adjusted 2 The original PMW pulse width size is scaled according to the primary R, red light, and the primary B, blue light.
When the primary color B, i.e. blue light, is dimmed, the point B moves to the right in the figure to the target position, assuming a shift s 3 The point a in the graph is dynamically adjusted accordingly; alternatively, when the primary color B, i.e., blue light, is turned on, the point B in the figure moves to the left to the target position, assuming a displacement s 3 The point a in the figure is dynamically adjusted accordingly. The position of the point a is adjusted by the method that s 3 The original PMW pulse width size is scaled according to the primary color G, i.e., green light, and the primary color R, i.e., red light.
As shown in fig. 3, no matter any adjustment is made to the primary colors by the user, the PWM pulse width of the overall output is unchanged, so that the overall brightness of the lamp light does not change. In this application, PWM pulse width refers to pulse width after pulse width modulation.
In addition, the color mixing mode has the function of sensing the regulation trend of the user, and the regulation process coordinates the intensity of the primary colors to promote the wave and shorten the stroke of the user in the regulation process. For example, the user may turn on the red light (only the parameters of the red light are changed at the input), at which time the system will automatically scale down the green and blue lights, highlighting the red color, allowing the user to shorten the "stroke" during the red light adjustment.
Correspondingly, the application provides a constant-brightness constant-power color mixing control method, which comprises the following steps: modulating the pulse width of one primary light based on the input instruction; and modulating the pulse widths of the other primary lights in linkage based on the modulation of the pulse widths of the primary lights so that the sum of the pulse widths of all the primary lights is kept at a constant value.
Further, the above-described manner of controlling the PWM pulse width of the overall output does not necessarily allow the overall brightness to be unchanged. The reason is that the original maximum brightness between the RGB primaries may be quite different, and uneven (e.g., different heights, different distances to step), may cause maladjustment, and may not reach the desired result. Therefore, in the optimized color mixing scheme, the original maximum brightness parameter of each primary color light can be introduced to achieve the aim of stably controlling the overall brightness of the mixed color light to be unchanged.
Further, after calculating the PWM pulse width of each primary light, if the PWM pulse width is outputted in parallel as in the prior art shown in fig. 1, the current is superimposed, the peak current is increased by several times (the number of primary colors is several times) as shown in fig. 4, and a larger power supply is required to be selected for supplying power, thereby increasing the cost.
Accordingly, the inventors of the present application propose a driving circuit corresponding to each primary color light by serially outputting a current.
Based on this, the present application proposes another constant-brightness constant-power toning control method, which includes: obtaining the maximum brightness of each primary color light source in the lamp; acquiring brightness adjustment coefficients of all primary color light sources based on the maximum brightness of all primary color light sources in the lamp; receiving a color mixing parameter of at least one primary color light source corresponding to an input instruction; determining dynamic adjustment coefficients corresponding to all primary color light sources based on the color mixing parameters of at least one primary color light source corresponding to the input instruction; determining the duty ratio of dynamic pulse width modulation of each primary light source based on the dynamic adjustment coefficient corresponding to each primary light source and the brightness adjustment coefficient of each primary light source; and outputting a modulation pulse width time sequence to the drivers corresponding to the primary color light sources in a serial conduction mode.
The method for controlling the color mixing of the schematic constant brightness and the constant power comprises the following steps: as shown in fig. 2 to 6, a constant-brightness constant-power toning control method according to an embodiment of the present application is illustrated. The constant-brightness constant-power color mixing control method provides a light color mixing scheme which can keep the total brightness of light basically unchanged in the color mixing process, and is suitable for being used in scene lighting applications. Because the lamplight color mixing scheme provided by the application can keep the total brightness of lamplight unchanged basically in the color mixing process, the human eyes can feel more comfortable and natural in the process of switching lamplight colors. In this way, the human eye comfort can be greatly optimized while guaranteeing atmosphere rendering and artistic appeal in scene lighting through light transformation.
Specifically, as previously described, the inventors of the present application propose to perform independent PWM adjustment of light of each primary color to perform linked PWM adjustment of light of each primary color. As shown in fig. 3, the light of 3 primary colors is distributed into a fixed period T. Accordingly, the present application proposes a constant brightness constant power color mixing control method, as shown in fig. 2, which includes: s110, modulating pulse width of one primary color light based on an input instruction; and S120, modulating the pulse width of other primary lights in linkage based on the modulation of the pulse width of the primary lights, so that the sum of the pulse widths of all the primary lights is kept at a constant value.
In step S110, the pulse width of one of the primary color lights is modulated based on the input instruction. Specifically, in practical applications, the luminaire comprises a plurality of primary light sources and a controller. And executing a corresponding algorithm after the controller of the lamp runs, and controlling each driving circuit by PWM so that each driving circuit outputs current to each primary color light source. The input instruction is issued by the customer, for example, the customer may issue an input instruction to turn down the brightness of the red light source through the operation member or the operation interface. The pulse width of the red light may be modulated based on an input instruction to turn down the brightness of the red light source.
In step S120, the pulse widths of the other primary lights are modulated in conjunction with the modulation of the pulse widths of the primary lights so that the sum of the pulse widths of all the primary lights is kept at a constant value. Specifically, since the sum of pulse widths of all the primary lights is kept at a constant value, when the pulse width of one of the primary lights is reduced, the pulse width of at least one of the other primary lights is increased; when the pulse width of one of the primary lights is increased, the pulse width of at least one of the other primary lights is decreased.
In an embodiment of the present application, the primary light includes red light, green light, and blue light. Accordingly, in some application scenarios, in step S110, the pulse width of the red light is modulated based on the input instruction. Then in step S120, the pulse width of the green light and the pulse width of the blue light are modulated in tandem based on the modulation of the pulse width of the red light so that the sum of the pulse widths of the red light, the green light, and the blue light remains at a constant value.
When the pulse width of the red light is reduced in the process of modulating the pulse width of the red light based on the input instruction, the pulse width of the green light and/or the pulse width of the blue light is increased in the process of modulating the pulse width of the green light and the pulse width of the blue light in linkage based on the modulation of the pulse width of the red light. When the pulse width of the red light is increased in the process of modulating the pulse width of the red light based on the input instruction, the pulse width of the green light and/or the pulse width of the blue light is decreased in the process of modulating the pulse width of the green light and the pulse width of the blue light in linkage based on the modulation of the pulse width of the red light.
In other application scenarios, in step S110, the pulse width of the green light is modulated based on the input instruction; then in step S120, the pulse width of the red light and the pulse width of the blue light are modulated in tandem based on the modulation of the pulse width of the green light so that the sum of the pulse widths of the red light, the green light, and the blue light remains at a constant value.
Reducing the pulse width of green light in the process of modulating the pulse width of red light based on an input instruction; the pulse width of the red light and/or the pulse width of the blue light is increased in the course of modulating the pulse width of the red light and the pulse width of the blue light in tandem based on the modulation of the pulse width of the green light. When the pulse width of the green light is increased during the modulation of the pulse width of the green light based on the input command, the pulse width of the red light and/or the pulse width of the blue light is decreased during the coordinated modulation of the pulse width of the red light and the pulse width of the blue light based on the modulation of the pulse width of the green light.
In still other application scenarios, in step S110, the pulse width of the blue light is modulated based on the input instruction; then in step S120, the pulse width of the green light and the pulse width of the red light are modulated in tandem based on the modulation of the pulse width of the blue light so that the sum of the pulse widths of the red light, the green light, and the blue light remains at a constant value.
Reducing the pulse width of the blue light in the process of modulating the pulse width of the blue light based on the input instruction; the pulse width of the green light and/or the pulse width of the red light is increased in the course of modulating the pulse width of the green light and the pulse width of the red light in tandem based on the modulation of the pulse width of the blue light. Increasing the pulse width of the blue light in the process of modulating the pulse width of the blue light based on the input instruction; the pulse width of the green light and/or the pulse width of the red light is reduced in the course of modulating the pulse width of the green light and the pulse width of the red light in tandem based on the modulation of the pulse width of the blue light.
No matter the user makes any adjustment to the primary colors, the PWM pulse width of the overall output is unchanged, so the overall brightness of the lamp light will not change. In this application, PWM pulse width refers to pulse width after pulse width modulation.
In addition, the lamplight color matching scheme can realize global dynamic color matching, link dimming is carried out in the color matching process, namely, the lights of the primary colors are mutually associated, and dimming is carried out by utilizing the association between the lights of the primary colors, so that the total brightness of lamplight can be maintained in the color matching process, the user adjusting trend can be perceived, the intensity of primary colors is coordinated in the adjusting process, the intensity of primary colors is increased, the stroke of the user is shortened in the adjusting process, and the effect of promoting the fluctuation is improved.
As described above, the PWM pulse width of the overall output is controlled to be constant, and thus the overall brightness is not necessarily constant. The reason is that the original maximum brightness between the RGB primaries may be quite different, and uneven (e.g., different heights, different distances to step), may cause maladjustment, and may not reach the desired result. Therefore, in the optimized color mixing scheme, the original maximum brightness parameter of each primary color light can be introduced to achieve the aim of stably controlling the overall brightness of the mixed color light to be unchanged.
Further, after calculating the PWM pulse width of each primary light, if the PWM pulse width is outputted in parallel as in the prior art shown in fig. 1, the current is superimposed, the peak current is increased by several times (the number of primary colors is several times) as shown in fig. 4, and a larger power supply is required to be selected for supplying power, thereby increasing the cost.
Accordingly, the inventors of the present application propose a driving circuit corresponding to each primary color light by serially outputting a current. The color matching device can maintain the total brightness of the lamplight basically unchanged in the color matching process, and can also maintain the output power basically unchanged, so that the power supply is efficiently utilized, and the cost is reduced to a certain extent.
Accordingly, another method for controlling constant brightness and constant power color mixing is provided, as shown in fig. 5, which includes: s210, obtaining the maximum brightness of each primary color light source in the lamp; s220, acquiring brightness adjustment coefficients of all primary light sources based on the maximum brightness of all the primary light sources in the lamp; s230, receiving the color mixing parameters of at least one primary color light source corresponding to the input instruction; s240, determining dynamic adjustment coefficients corresponding to the primary color light sources based on the color mixing parameters of at least one primary color light source corresponding to the input instruction; s250, determining the duty ratio of dynamic pulse width modulation of each primary light source based on the dynamic adjustment coefficient corresponding to each primary light source and the brightness adjustment coefficient of each primary light source; and S260, outputting a modulation pulse width time sequence to the drivers corresponding to the primary color light sources in a serial conduction mode.
In step S210, the maximum brightness of each primary light source in the luminaire is obtained. Specifically, in the process of obtaining the maximum brightness of each primary light source in the lamp, each primary light source is respectively placed in a black room, and the maximum brightness of each primary light source is measured. The black room refers to a space with extremely dark light. />The value of (2) is an integer greater than or equal to 1, ">Representing the primary colors. For example, when->When equal to 1>Representing red; when->When equal to 2->Representing green; when->When equal to 3->Indicating blue. Accordingly, the +>Representing the maximum brightness of the red light source +.>Representing the maximum brightness of the green light source, +.>Indicating the maximum brightness of the blue light source.
It should be understood that, in other embodiments,the primary colors corresponding to the respective values of (a) may be implemented in other manners.
In step S220, the brightness adjustment coefficient of each primary light source is obtained based on the maximum brightness of each primary light source in the lamp. Specifically, the luminance adjustment coefficient of each primary color light source is calculated by the following relation:the method comprises the steps of carrying out a first treatment on the surface of the Wherein (1)>A brightness adjustment coefficient representing each primary color light source; />；/>Representing a minimum value operation.
In step S230, a color matching parameter of at least one primary color light source corresponding to the input command is received. For example, the user performs the color matching operation on the lamp and inputs the color matching parametersn 1 ，n 2 ，…，n i . The values of the respective shading parameters are 0-N, where N represents the highest dimming level (hereinafter, referred to as "highest dimming level"), typically N may be n=99 or 255 or 65535, in this case n=255 (hereinafter, referred to as "highest dimming level"), and 0 represents the 0 th level, which is the off (non-lighted) state.
In step S240, a dynamic adjustment coefficient corresponding to each primary light source is determined based on the color mixing parameter of at least one primary light source corresponding to the input instruction. Specifically, the dynamic adjustment coefficients corresponding to the primary color light sources are calculated by the following relation:the method comprises the steps of carrying out a first treatment on the surface of the Wherein (1)>A brightness adjustment coefficient representing each primary color light source; />；/>And the color mixing parameters of the primary color light sources corresponding to the input instruction are represented.
In step S250, the duty cycle of the dynamic pulse width modulation of each primary light source is determined based on the dynamic adjustment coefficient corresponding to each primary light source and the luminance adjustment coefficient of each primary light source. Specifically, the duty cycle of the dynamic pulse width modulation of each primary light source is calculated by the following relation:the method comprises the steps of carrying out a first treatment on the surface of the Wherein (1)>A brightness adjustment coefficient representing each primary color light source; />；/>The value of (2) is an integer greater than or equal to 1, ">Representing the primary colors.
In step S260, a modulation pulse width timing is outputted to the driver corresponding to each primary light source in a serial on manner. Specifically, the output timing is converted by the following relation:the method comprises the steps of carrying out a first treatment on the surface of the Wherein (1)>Representing the corresponding period on-time of each primary light source, < >>Representing the period closing time corresponding to each primary color; />Indicating the set period. />Can be set according to the requirements, e.g. in a specific example of the present application,/or->Set to 500 microseconds.
As shown in FIG. 6, gaps appear between adjacent timings, gapsIs proportional to +.>。/>Maximum luminance +.>Related to, because->Is a constant value related to the system, so the gap +.>Also, the value is constant, so that the output mixed current is stable regardless of the color mixing, so that a constant power output is realized.
In summary, the constant brightness and constant power color mixing control method is clarified, so that the total brightness of the lamplight can be maintained unchanged basically in the color mixing process, and the output power can be maintained unchanged basically in an optimized implementation mode, so that the power supply is utilized efficiently, and the cost is reduced to a certain extent.
An exemplary luminaire: as shown in fig. 7, a luminaire according to an embodiment of the present application is illustrated. The lamp comprises a plurality of primary color light sources and a controller, wherein the controller is connected with the primary color light sources. The luminaire is capable of maintaining the overall brightness of the light substantially unchanged during tinting, and is suitable for use in a scene lighting application.
In some embodiments of the present application, the controller is connected to a plurality of primary color light sources, and the controller is configured to obtain a maximum brightness of each primary color light source in the lamp; acquiring brightness adjustment coefficients of all primary color light sources based on the maximum brightness of all primary color light sources in the lamp; receiving a color mixing parameter of at least one primary color light source corresponding to an input instruction; determining dynamic adjustment coefficients corresponding to all primary color light sources based on the color mixing parameters of at least one primary color light source corresponding to the input instruction; determining the duty ratio of dynamic pulse width modulation of each primary light source based on the dynamic adjustment coefficient corresponding to each primary light source and the brightness adjustment coefficient of each primary light source; and outputting a modulation pulse width time sequence to the drivers corresponding to the primary color light sources in a serial conduction mode.
In some embodiments of the present application, the controller is further configured to calculate the brightness adjustment coefficient of each primary light source by the following relation:the method comprises the steps of carrying out a first treatment on the surface of the Wherein (1)>A brightness adjustment coefficient representing each primary color light source; />；Representing the minimum value operation,/->The value of (2) is an integer greater than or equal to 1, ">Representing the primary colors.
In some embodiments of the present application, the controller is further configured to calculate a dynamic adjustment coefficient corresponding to each primary light source by the following relation:the method comprises the steps of carrying out a first treatment on the surface of the Wherein (1)>A brightness adjustment coefficient representing each primary color light source; />；And the color mixing parameters of the primary color light sources corresponding to the input instruction are represented.
In some embodiments of the present application, the controller is further configured to calculate the duty cycle of the dynamic pulse width modulation of each primary light source by the following relationship:the method comprises the steps of carrying out a first treatment on the surface of the Wherein (1)>A brightness adjustment coefficient representing each primary color light source; />。
In some embodiments of the present application, the controller is further configured to convert the output timing by the following relationship:the method comprises the steps of carrying out a first treatment on the surface of the Wherein (1)>Representing the corresponding period on-time of each primary light source, < >>Representing the period closing time corresponding to each primary color; />Indicating the set period.
The controller of the lamp is also used for controlling each driving circuit by PWM so that each driving circuit outputs current to each primary color light source.
In some embodiments of the present application, the controller is configured to modulate the pulse width of one of the primary lights based on an input instruction; and modulating the pulse widths of the other primary lights in linkage based on the modulation of the pulse widths of the primary lights so that the sum of the pulse widths of all the primary lights is kept at a constant value.
In summary, a luminaire according to embodiments of the present application is illustrated that is capable of maintaining the overall brightness of the light substantially unchanged during tinting, and is suitable for use in a scene lighting application.
The present application and its embodiments have been described above with no limitation, and the actual structure is not limited to this, but is only one of the embodiments of the present application shown in the drawings. In summary, if one of ordinary skill in the art is informed by this disclosure, a structural manner and an embodiment similar to the technical solution are not creatively devised without departing from the gist of the present application, and all the structural manners and the embodiments are considered to be within the protection scope of the present application.
Claims (8)
1. The constant brightness and constant power color mixing control method is characterized by comprising the following steps: obtaining the maximum brightness of each primary color light source in the lamp; acquiring brightness adjustment coefficients of all primary color light sources based on the maximum brightness of all primary color light sources in the lamp; receiving color mixing parameters of all primary color light sources corresponding to an input instruction; determining dynamic adjustment coefficients corresponding to all primary color light sources based on the color mixing parameters of all primary color light sources corresponding to the input instruction; determining the duty ratio of dynamic pulse width modulation of each primary light source based on the dynamic adjustment coefficient corresponding to each primary light source and the brightness adjustment coefficient of each primary light source; and outputting a modulation pulse width time sequence to the drivers corresponding to the primary color light sources in a serial conduction mode.
2. The constant brightness constant power color mixing control method according to claim 1, wherein obtaining the maximum brightness of each primary color light source in the lamp comprises: respectively placing each primary color light source in a black room, and measuring the maximum brightness of each primary color light sourceWherein->The value of (2) is an integer greater than or equal to 1, ">Representing the primary colors.
3. The constant-luminance constant-power toning control method according to claim 1, wherein obtaining the luminance adjustment coefficient of each primary light source based on the maximum luminance of each primary light source in the lamp comprises: calculating brightness adjustment coefficients of the primary color light sources by the following relation:the method comprises the steps of carrying out a first treatment on the surface of the Wherein (1)>A brightness adjustment coefficient representing each primary color light source; />；/>Representing the minimum value operation,/->The value of (2) is an integer greater than or equal to 1, ">Representing the primary colors.
4. The constant brightness constant power toning control method according to claim 1, wherein determining the dynamic adjustment coefficient corresponding to each primary color light source based on the toning parameter of at least one primary color light source corresponding to the input instruction comprises: calculating the dynamic adjustment coefficient corresponding to each primary color light source by the following relation:the method comprises the steps of carrying out a first treatment on the surface of the Wherein (1)>A brightness adjustment coefficient representing each primary color light source; />；/>The value of (2) is an integer greater than or equal to 1, ">Representing the primary color->And the color mixing parameters of the primary color light sources corresponding to the input instruction are represented.
5. The constant brightness constant power toning control method according to claim 1, wherein determining the duty ratio of the dynamic pulse width modulation of each primary light source based on the dynamic adjustment coefficient corresponding to each primary light source and the brightness adjustment coefficient of each primary light source comprises: the duty cycle of the dynamic pulse width modulation of each primary light source is calculated by the following relation:the method comprises the steps of carrying out a first treatment on the surface of the Wherein (1)>A brightness adjustment coefficient representing each primary color light source; />；/>The value of (2) is an integer greater than or equal to 1, ">Representing the primary colors.
6. The constant brightness constant power toning control method according to claim 5, wherein outputting modulation pulse width timing to the driver corresponding to each primary color light source in a serial conduction mode, comprises: the output timing is converted by the following relation:the method comprises the steps of carrying out a first treatment on the surface of the Wherein (1)>Representing the corresponding period on-time of each primary light source, < >>Representing the period closing time corresponding to each primary color; />Indicating the set period.
7. The constant brightness constant power toning control method according to claim 6, wherein,500 microseconds.
8. A luminaire operating with a constant brightness constant power tinting control method as claimed in any one of claims 1 to 7.
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