CN117580212B - Dimming lamp control method with smooth dark part - Google Patents
Dimming lamp control method with smooth dark part Download PDFInfo
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
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- H05B45/325—Pulse-width modulation [PWM]
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- H—ELECTRICITY
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Abstract
The application discloses a dimming lamp control method with smooth dark part, which comprises the following steps: receiving dimming parameter input data; outputting a PWM dimming signal based on the dimming parameter input data; receiving a current acquisition signal, wherein the current acquisition signal characterizes real-time output current of the constant current device; and controlling the resistance of the balancing device based on the current acquisition signal so as to keep the load voltage of the constant current device unchanged, wherein the balancing device is connected in series with the light source which is dimmed, the balancing device and the light source which is dimmed form a load unit together, and the load unit is connected in series with the constant current device. The dimming lamp control method for smooth dimming of the dark part balances voltage of a load unit of a constant current device load, dynamically compensates and adjusts nonlinear current accurately, enables current flowing through a dimmed light source to change linearly, enables light source brightness to smoothly and stably transition in the dimming process of the dark part, and avoids dimming jitter in the dimming process of the dark part.
Description
Technical Field
The application relates to the technical field of lamp dimming, in particular to a dimming lamp control method with smooth dark parts.
Background
The human eye is more sensitive to changes in light in dark environments, for example, a weak change in firefly fluorescence flicker can be seen in dark environments. The human eye is numer to perceive changes in light in a strong light environment, e.g., under a burning sun, there is no difference in the brightness of the point 1 candles and the point 2 candles.
The existing lamp has the problems that dimming flicker and dimming jitter occur in the dimming process, and the brightness of the lamp is lower, so that the lamp is more obvious. The phenomenon that the lamp light unevenly blinks during dimming may be referred to as dimming blinks, and the phenomenon that the lamp light unevenly blinks during dimming may be referred to as dimming jitter. For example, in an application scene of a program show, when the brightness of a lamp is slowly dimmed from dark or from bright within a certain period of time, for example, 30 seconds, during dimming of the lamp, an observer can feel that the lamp is unevenly dithered when dimming a dark portion. As shown in fig. 1, the horizontal axis represents the uniform dimming level and the vertical axis represents the observer's visual brightness. The greater the dimming level, the greater the brightness of the luminaire. The dimming of the dark part refers to the process of adjusting the brightness of the lamp from darker to a certain brightness, and the dimming level corresponding to the dimming process of the dark part is lower.
In order to solve the above-mentioned problems of dimming jitter or dimming flicker, some existing dimming schemes skip the dimming process of the dark portion, and gradually lighten from the time when the brightness is brighter, and accordingly, directly start dimming from a higher dimming level and gradually increase the dimming level.
However, the human eye is more sensitive to abrupt changes in brightness, e.g., eyes are not dared to open at the moment of waking up a lamp in the middle of the night. Therefore, the prior art skips the dimming process of the dark part, and the dimming is performed gradually when the brightness is brighter, so that the lamp light is suddenly very bright when dimming starts, the human eyes are difficult to adapt, and the experience is influenced.
Therefore, there is a need to develop a dimming scheme with smooth dark portions to meet the user's demands.
Disclosure of Invention
An advantage of the present application is that it provides a smooth dimming lamp control method of dark portion, wherein, smooth dimming lamp control method of dark portion can solve dark portion and adjust luminance unsmooth smooth problem, realizes dark portion linear dimming, avoids taking place to adjust luminance shake at dark portion in-process of adjusting luminance, guarantees at the in-process of adjusting luminance people's eye color comfort level.
Another advantage of the present invention is to provide a dimming lamp control method with smooth dark portions, wherein the dimming lamp control method with smooth dark portions can adjust current flowing through a dimmed light source in real time, so that a current rising slope is kept substantially constant, and further the brightness of the light source in the dimming process of the dark portions is smoothly and stably transited, so as to avoid dimming jitter in the dimming process of the dark portions.
Another advantage of the present application is to provide a dimming lamp control method with smooth dark portions, in which, in the dimming lamp control method with smooth dark portions, current flowing through a dimmed light source is sampled in real time, and an equalizing device related to parameters of a hardware dimming system is introduced to perform equalizing voltage on a load unit of a constant current device load, so that nonlinear current is dynamically compensated and adjusted accurately, and current flowing through the dimmed light source changes linearly.
According to one aspect of the present application, there is provided a dimming lamp control method with smooth dark portions, including:
presetting inherent dimming parameters of a system;
receiving dimming parameter input data;
outputting a PWM dimming signal based on the dimming parameter input data;
receiving a current acquisition signal, wherein the current acquisition signal characterizes real-time output current of the constant current device; and
controlling the resistance of an equalizing device based on the current acquisition signal so as to keep the load voltage of the constant current device unchanged, wherein the equalizing device is connected in series with the light source to be dimmed, the equalizing device and the light source to be dimmed form a load unit together, and the load unit is connected in series with the constant current device;
the preset system inherent dimming parameters comprise:
measuring the real-time output current of the constant current device and the real-time voltage at two ends of the light source to be dimmed in the process that the real-time output current of the constant current device rises from 0 to a peak value, and establishing and pre-storing a functional relation of the real-time voltage at two ends of the light source to be dimmed with respect to the real-time output current of the constant current device; and
measuring the load voltage of the constant current device when the constant current device is fully loaded;
controlling the resistance of the equalizing device based on the current collecting signal, comprising:
determining a real-time resistance to be achieved by the balancing device based on a functional relation of real-time voltage at two ends of the light source to be dimmed with respect to real-time output current of the constant current device, a load voltage of the constant current device when the constant current device is fully loaded, and the real-time output current of the constant current device represented by the current acquisition signal;
the real-time resistance that the equalization device should reach is calculated by the following equation:
；
wherein,R t representing the real-time resistance that the equalizing device should reach;V LED a load voltage for the constant current device;I t representing the real-time output current of the constant current device;f(I t )a functional relation representing the real-time voltage across the dimmed light source with respect to the real-time output current of the constant current device; and in the process of controlling the resistance of the balancing device based on the current acquisition signal, the load voltage of the constant current device is kept to be the load voltage when the constant current device is fully loaded.
In an embodiment of the dimming lamp control method with smooth dark part, in the process of receiving dimming parameter input data, the dimming parameter input data is received by the control device, and in the process of outputting PWM dimming signals based on the dimming parameter input data, the PWM dimming signals are output to the constant current device by the control device based on the dimming parameter input data, wherein the control device is connected to the constant current device, the constant current device is connected with the equalization device in series, and the equalization device is connected to the control device; and in the process of receiving the current acquisition signal, the control device is used for receiving the current acquisition signal from the current acquisition module, wherein the current acquisition module is connected in series with the constant current device and is connected with the control device.
In an embodiment of the dimming lamp control method with smooth dark portion, the balancing device is a digital potentiometer, and the basic topology of the constant current device is a BUCK topology.
According to another aspect of the present application, there is provided another dimming lamp control method for smooth dark portions, including:
presetting inherent dimming parameters of a system;
receiving dimming parameter input data;
outputting a PWM dimming signal based on the dimming parameter input data;
receiving a current acquisition signal, wherein the current acquisition signal characterizes real-time output current of the constant current device;
receiving a voltage acquisition signal, wherein the voltage acquisition signal represents real-time voltage at two ends of the light source to be dimmed; and
controlling the resistance of an equalizing device based on the current acquisition signal and the voltage acquisition signal so as to keep the load voltage of the constant current device unchanged, wherein the equalizing device is connected in series with the light source to be dimmed, the equalizing device and the light source to be dimmed form a load unit together, and the load unit is connected in series with the constant current device;
the preset system inherent dimming parameters comprise:
measuring the load voltage of the constant current device when the constant current device is fully loaded through a voltage acquisition module;
controlling the resistance of the equalizing device based on the current collecting signal and the voltage collecting signal, comprising:
measuring real-time voltage at two ends of the dimmed light source through the voltage acquisition module; and
determining a real-time resistance to be achieved by the balancing device based on the real-time voltage at two ends of the light source to be dimmed, the load voltage when the constant current device is fully loaded, and the real-time output current of the constant current device;
the real-time resistance that the equalization device should reach is calculated by the following equation:
；
wherein,R t representing the real-time resistance that the equalizing device should reach;V LED a load voltage for the constant current device;I t representing the real-time output current of the constant current device;V t representing real-time voltages across the dimmed light source measured by the voltage acquisition module; and in the process of controlling the resistance of the balancing device based on the current acquisition signal and the voltage acquisition signal, the load voltage of the constant current device is kept to be the load voltage when the constant current device is fully loaded.
In an embodiment of the dimming lamp control method with smooth dark portion, the voltage acquisition module is connected in parallel to the light source to be dimmed.
In an embodiment of the dimming lamp control method with smooth dark part, in the process of receiving dimming parameter input data, the dimming parameter input data is received by the control device, and in the process of outputting PWM dimming signals based on the dimming parameter input data, the PWM dimming signals are output to the constant current device by the control device based on the dimming parameter input data, wherein the control device is connected to the constant current device, the constant current device is connected with the equalization device in series, and the equalization device is connected to the control device; in the process of receiving the current acquisition signal, receiving the current acquisition signal from a current acquisition module through the control device, wherein the current acquisition module is connected in series with the constant current device and is connected with the control device; in the process of receiving the voltage acquisition signal, the control device receives the voltage acquisition signal from the voltage acquisition module; the voltage acquisition module is connected to the control device, the balancing device is a digital potentiometer, and the basic topology of the constant current device is BUCK topology.
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 a schematic diagram of a change of visual brightness with dimming level in a conventional dimming process.
Fig. 2 illustrates a corresponding schematic diagram of a voltage waveform of a PWM dimming signal and a current waveform of a light source controlled by the PWM dimming signal in a conventional dimming process.
Fig. 3 illustrates a prior art hardware dimming system.
Fig. 4 illustrates a schematic diagram of the current versus voltage of a light source in a conventional dimming process.
Fig. 5 illustrates a flow diagram of an implementation of a dim light control method with smooth dim portion according to an embodiment of the present application.
Fig. 6 illustrates a schematic diagram of a hardware dimming system in an implementation of the dimming lamp control method with smooth dark portion illustrated in fig. 5 according to an embodiment of the present application.
Fig. 7 illustrates a flow diagram of another implementation of a dim light control method according to an embodiment of the present application.
Fig. 8 illustrates a schematic diagram of a hardware dimming system in an implementation of the dim smooth dimming lamp control method according to an embodiment of the present application illustrated in fig. 7.
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, in order to solve the above-mentioned dimming jitter or dimming flicker problem, some existing dimming schemes skip the dimming process, and directly turn on gradually from when the brightness is brighter, and accordingly, directly start dimming from a higher dimming level and gradually turn up the dimming level.
However, the human eye is more sensitive to abrupt changes in brightness, e.g., eyes are not dared to open at the moment of waking up a lamp in the middle of the night. Therefore, the prior art skips the dimming process of the dark part, and the dimming is performed gradually when the brightness is brighter, so that the lamp light is suddenly very bright when dimming starts, the human eyes are difficult to adapt, and the experience is influenced.
Therefore, there is a need to develop a dimming scheme with smooth dark portions to meet the user's demands.
Of the present applicationThe inventor has found that in the prior art, one of the causes of dimming jitter or dimming flicker is that the driving circuit of the lamp is nonlinear. Specifically, fig. 2 illustrates a corresponding graphical representation of the voltage waveform of a PWM (Pulse Width Modulation, pulse width modulated) dimming signal and the current waveform of a light source controlled by the PWM dimming signal. Fig. 3 illustrates a prior art hardware dimming system. As shown in fig. 2 and 3, the dimming system in the prior art includes a control device and a constant current device, where the control device sends a PWM dimming signal to the constant current device, and the constant current device drives the light source to work. In the course of a light source controlled by a PWM dimming signal, t in each PWM period on In the time, the constant current device is started, t off In time, the constant current device is closed; when the constant current device is started, the current climbs from 0 to rated current I; when the constant current device is turned off, the current drops from the rated current to 0. When darker dimming is required, i.e. dark dimming, t on Narrowing, when the constant current device is started, the current rises. When t on At t1 in the figure, the current waveform is a curve S1, and thus appears as nonlinearity at the time of dimming. Thus, when dark dimming is performed, the brightness of the light source varies non-linearly, resulting in dimming jitter.
Based on the above findings, the inventors of the present application propose to linearly climb the current passing through the light source during the dimming of the dark portion, which is shown in the figure as follows: allowing the current through the light source to climb along a straight line OP.
Specifically, the rising slope of the current through the light source can be characterized by circuit parameters, calculated by the following equation:
(1)；
wherein,kis the rate of change of the current through the light source;V in is the input voltage of the constant-current device,V LED the load voltage of the constant current device; l is the inductance value of the inductance element when the constant current device is driven.
The input voltage of the constant current device is unchanged when in operation, and is constant asV in . The inductance value of the inductance element is unchanged when the constant current device is driven during operation, and is constant asL. In the course of the operation of the device,V LED will vary with current. The high-power light source is connected with a plurality of LED light sources in series,V LED the change with current is more pronounced. As shown in FIG. 4, when the forward current IF of the LED increases, the forward voltage VF increases, i.eV LED Increasing.
From the above, when the dimming level is increased at a constant speed during dimming of the dark portion, the current flowing through the light source is increased greatly, resulting inV LED Increasing the rate of change of the current through the light source, i.e. the slope of the current through the light sourcekAt the increase, the increase in current is thus a non-uniform nonlinear change. The human eye is visually sharp during dim dimming, so dimming jitter is seen (as in fig. 1). When the current climbs to the peak point P, the current is slightly waved, namely current ripple (shown in figure 2), and the current is generated by the working period of the constant current device, so that the light enters the bright part for dimming, the human eyes feel dullness at the moment, and the obtained light still linearly changes and is not influenced by the current ripple.
If the curve S0 is adjusted to a straight line S1, i.e. if the current rises along a straight line, a full smooth dimming can be achieved. If the load voltage of the constant current deviceV LED To a fixed value, the rate of change of the current through the regulated light source can be controlledkThe current passing through the light source can climb along a straight line for a fixed value, and further the whole-course smooth dimming is realized.
According to the method, the current flowing through the light source to be dimmed is sampled in real time, the balancing device related to the hardware dimming system parameter is introduced, the balancing voltage is carried out on the load unit of the constant-current device load, the nonlinear current is adjusted in a relatively accurate dynamic compensation mode, the current flowing through the light source to be dimmed is in linear change, the light source brightness in the dimming process of the dark portion is smoothly and stably transited, dimming jitter in the dimming process of the dark portion is avoided, and the human eye comfort level in the dimming process is guaranteed.
Based on this, the present application proposes a dimming lamp control method with smooth dark portion, which includes: receiving dimming parameter input data; outputting a PWM dimming signal based on the dimming parameter input data; receiving a current acquisition signal, wherein the current acquisition signal characterizes real-time output current of the constant current device; and controlling the resistance of the balancing device based on the current acquisition signal so as to keep the load voltage of the constant current device unchanged, wherein the balancing device is connected in series with the light source which is dimmed, the balancing device and the light source which is dimmed form a load unit together, and the load unit is connected in series with the constant current device.
The control method of the dimming lamp with smooth schematic dark part comprises the following steps:as shown in fig. 5 to 8, the dimming lamp control method with smooth dark portions according to the embodiment of the present application. Specifically, as shown in fig. 5, in an implementation manner of the dimming lamp control method with smooth dark portions according to the embodiment of the present application, the dimming lamp control method with smooth dark portions includes: s110, receiving dimming parameter input data; s120, outputting PWM dimming signals based on the dimming parameter input data; s130, receiving a current acquisition signal, wherein the current acquisition signal characterizes real-time output current of the constant current device; and S140, controlling the resistance of the balancing device based on the current acquisition signal so as to keep the load voltage of the constant current device unchanged, wherein the balancing device is connected in series with the light source to be dimmed, the balancing device and the light source to be dimmed jointly form a load unit, and the load unit is connected in series with the constant current device.
As described above, the present application samples the current flowing through the dimmed light source in real time, introduces an equalizing device related to the parameters of the hardware dimming system, and equalizes the voltage of the load unit loaded by the constant current device. Accordingly, in the dimming lamp control method with smooth dark portions, the hardware dimming system is adjusted. As shown in fig. 6, in an embodiment of the dimming lamp control method with smooth dark portion, the hardware dimming system includes a control device, a constant current device, a current collection module and an equalization device. The control device is connected with the constant current device; the current acquisition module is connected in series with the constant current device and is connected with the control device; the equalization deviceThe balancing device is connected with the control device in series with the light source to be dimmed, the balancing device and the light source to be dimmed form a load unit together, and the load unit is connected with the constant current device in series. Thus, the constant current device is connected in series with the equalizing device. The basic topology of the constant current device is BUCK topology. The current acquisition module is used for monitoring real-time current output by the constant current deviceI t . The equalizing device may be a digital potentiometer (Digital Potentiometer, also known as a digitally controlled programmable resistor) having a resistance value R. The light sources to be dimmed may be LED light sources, each light source may be 1 or more LEDs connected in series or parallel or series-parallel.
In step S110, dimming parameter input data is received. Specifically, dimming parameter input data input by a user is received through the control device.
In step S120, a PWM dimming signal is output based on the dimming parameter input data. Specifically, a PWM dimming signal is output to the constant current device by the control device based on the dimming parameter input data.
In step S130, a current acquisition signal is received. Specifically, a current collection signal from a current collection module is received by the control device.
In step S140, the resistance of the equalizing means is controlled based on the current collecting signal. Specifically, the control device controls the resistor of the balancing device based on the current collecting signal to balance the voltage of the load unit of the constant current device, so that the load voltage of the constant current device is kept unchanged, and the brightness of the light source is smoothly and stably transited in the dimming process of the dark part, so that the dimming jitter in the dimming process of the dark part is avoided, and the comfort level of eyes in the dimming process is ensured.
Before this, i.e. before steps S110 to S140, the dimming lamp control method for the dimming portion to be smooth further includes step S150, presetting the system inherent dimming parameters.
In the process of presetting inherent dimming parameters of a system, firstly, the current of an original constant-current device needs to be measured in the process of rising from 0 to a peak value P pointReal-time currentI t Real-time voltage across the light sourceV t And preset in the control device for inquiry, and is recorded as:
(2)；
then, the load voltage and the sum of the load voltage of the original constant current device when the constant current device is fully loaded are measuredf(I t )Is a system inherent dimming parameter.
Accordingly, in this embodiment, step S150 includes: s151, measuring the real-time output current of the constant current device and the real-time voltage at two ends of the light source to be dimmed in the process that the real-time output current of the constant current device rises from 0 to a peak value, and establishing and pre-storing a functional relation of the real-time voltage at two ends of the light source to be dimmed with respect to the real-time output current of the constant current device; and S152, measuring the load voltage of the constant current device when the constant current device is fully loaded.
In the process of controlling the resistance of the balancing device based on the current acquisition signal to keep the load voltage of the constant current device unchanged, setting the voltage at two ends of the balancing device implemented as a digital potentiometer as in the process of increasing the current of the constant current device from 0 to a peak P pointV R Is calculated by the following formula:
(3)；
according to ohm law R=U/I, the undetermined real-time resistance of the digital potentiometer can be further obtainedR t The method comprises the following steps:
(4)；
the simultaneous (2) formula, (3) formula and (4) formula are available;
(5)；
the current acquisition module monitors real-time current output by the constant current deviceI t By corresponding rulef(I t )Look-up table in the control device to obtain corresponding voltageV t Subtracting the load voltage of the constant current deviceV t The resulting difference divided by the real-time currentI t The undetermined real-time resistance of the digital potentiometer can be calculatedR t . At this time, the control device outputs a required signal to the digital potentiometer, and the required resistance value can be adjusted. And in the process of controlling the resistance of the balancing device based on the current acquisition signal, the load voltage of the constant current device is kept to be a constant value, and the load voltage when the constant current device is fully loaded can be used as the constant value.
From the whole-range regulation, the digital potential dynamically compensates the voltageV R So that the load voltage of the constant current deviceV LED Is a constant value. As can be seen from equation (1), the current rises along the straight line OP. Achieving the expected purpose.
Accordingly, step S140 includes: and determining the real-time resistance to be achieved by the balancing device based on a functional relation of the real-time voltage at the two ends of the light source to be dimmed with respect to the real-time output current of the constant current device, the load voltage of the constant current device when the constant current device is fully loaded, and the real-time output current of the constant current device, which is represented by the current acquisition signal.
The real-time resistance that the equalization device should reach is calculated by the following equation:
；
wherein,R t representing the real-time resistance that the equalizing device should reach;V LED a load voltage for the constant current device;I t representing the real-time output current of the constant current device;f(I t )representing a function of the real-time voltage across the dimmed light source as a function of the real-time output current of the constant current deviceA relational expression; and in the process of controlling the resistance of the balancing device based on the current acquisition signal, the load voltage of the constant current device is kept to be the load voltage when the constant current device is fully loaded.
As shown in fig. 7, in another implementation of the dimming lamp control method with smooth dark portions according to the embodiment of the present application, the dimming lamp control method with smooth dark portions includes: s210, receiving dimming parameter input data; s220, outputting PWM dimming signals based on the dimming parameter input data; s230, receiving a current acquisition signal, wherein the current acquisition signal characterizes real-time output current of the constant current device; s240, receiving a voltage acquisition signal, wherein the voltage acquisition signal represents real-time voltage at two ends of the light source to be dimmed; and S250, controlling the resistance of an equalization device based on the current acquisition signal and the voltage acquisition signal so as to keep the load voltage of the constant current device unchanged, wherein the equalization device is connected in series with the light source to be dimmed, the equalization device and the light source to be dimmed jointly form a load unit, and the load unit is connected in series with the constant current device.
As shown in fig. 8, in an embodiment of the dimming lamp control method with smooth dark portion illustrated in fig. 7, the hardware dimming system includes a control device, a constant current device, a current collection module, a voltage collection module, and an equalizing device. The control device is connected with the constant current device; the current acquisition module is connected in series with the constant current device and is connected with the control device; the balancing device is connected to the control device and is connected in series with the light source to be dimmed, the balancing device and the light source to be dimmed form a load unit together, and the load unit is connected in series with the constant current device. Thus, the constant current device is connected in series with the equalizing device. The basic topology of the constant current device is BUCK topology. The current acquisition module is used for monitoring real-time current output by the constant current deviceI t . The voltage acquisition module is used for monitoring real-time voltage at two ends of the light source to be dimmedV t . The equalizing device may be a digital potentiometer (Digital Potentiometer, also known as a numerical control deviceProgramming resistor) having a resistance value R. The light sources to be dimmed may be LED light sources, each light source may be 1 or more LEDs connected in series or parallel or series-parallel. The voltage acquisition module is connected in parallel with the light source to be dimmed and is connected with the control device.
In step S210, dimming parameter input data is received. Specifically, dimming parameter input data input by a user is received through the control device.
In step S220, a PWM dimming signal is output based on the dimming parameter input data. Specifically, a PWM dimming signal is output to the constant current device by the control device based on the dimming parameter input data.
In step S230, a current acquisition signal is received. Specifically, a current collection signal from a current collection module is received by the control device.
In step S240, a voltage acquisition signal is received. Specifically, a voltage acquisition signal from a voltage acquisition module is received by the control device.
In step S250, the resistance of the equalizing means is controlled based on the current collecting signal and the voltage collecting signal. Specifically, the control device controls the resistor of the balancing device based on the current acquisition signal and the voltage acquisition signal to balance the voltage of the load unit of the constant current device, so that the load voltage of the constant current device is kept unchanged, and the brightness of the light source is smoothly and stably transited in the dimming process of the dark part, so that the dimming jitter in the dimming process of the dark part is avoided, and the comfort level of eyes in the dimming process is ensured.
Before this, i.e. before steps S210 to S250, the dimming lamp control method for the dimming portion to be smooth further includes step S260, presetting the system inherent dimming parameters.
In the process of presetting inherent dimming parameters of a system, the load voltage of an original constant current device when the constant current device is fully loaded needs to be measured. The load voltage of the constant current device when the constant current device is fully loaded is the inherent dimming parameter of the system.
Accordingly, in this embodiment, step S260 includes: and measuring the load voltage of the constant current device when the constant current device is fully loaded through a voltage acquisition module.
In the process of controlling the resistance of the balancing device based on the current acquisition signal and the voltage acquisition signal, setting the voltage at two ends of the digital potentiometer asV R Is calculated by the following formula:
(6)；
according to ohm law R=U/I, the undetermined real-time resistance of the digital potentiometer can be further obtainedR t The method comprises the following steps:
(7)；
the simultaneous (6) and (7) formulas are available;
(8)；
the current acquisition module monitors real-time current output by the constant current deviceI t The voltage acquisition module monitors real-time voltage at two ends of the light sourceV t Subtracting the load voltage of the constant current device when the constant current device is fully loadedV t The resulting difference divided by the real-time currentI t The undetermined real-time resistance of the digital potentiometer can be calculatedR t . At this time, the control device outputs a required signal to the digital potentiometer, and the required resistance value can be adjusted.
From the whole-range regulation, the digital potential dynamically compensates the voltageV LED So that the load voltage of the constant current deviceV LED Is a constant value. As can be seen from equation (1), the current rises along the straight line OP. Achieving the expected purpose.
Accordingly, controlling the resistance of the equalizing device based on the current collecting signal and the voltage collecting signal, comprises: measuring real-time voltage at two ends of the dimmed light source through the voltage acquisition module; and determining the real-time resistance to be reached by the balancing device based on the real-time voltage at the two ends of the light source to be dimmed, the load voltage when the constant current device is fully loaded, and the real-time output current of the constant current device. The real-time resistance that the equalization device should reach is calculated by the following equation:
；
wherein,R t representing the real-time resistance that the equalizing device should reach;V LED a load voltage for the constant current device;I t representing the real-time output current of the constant current device;V t representing real-time voltages across the dimmed light source measured by the voltage acquisition module; and in the process of controlling the resistance of the balancing device based on the current acquisition signal and the voltage acquisition signal, the load voltage of the constant current device is kept to be the load voltage when the constant current device is fully loaded.
In summary, a dimming lamp control method with smooth dark portions according to embodiments of the present application is illustrated. The dimming lamp control method for smooth dimming of the dark part balances voltage of a load unit of a constant current device load, dynamically compensates and adjusts nonlinear current accurately, enables current flowing through a dimmed light source to change linearly, enables light source brightness to smoothly and stably transition in the dimming process of the dark part, avoids dimming jitter in the dimming process of the dark part, and ensures comfort level of eyes in the dimming process.
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 (6)
1. A dimming lamp control method with smooth dark part is characterized by comprising the following steps:
presetting inherent dimming parameters of a system;
receiving dimming parameter input data;
outputting a PWM dimming signal based on the dimming parameter input data;
receiving a current acquisition signal, wherein the current acquisition signal characterizes real-time output current of the constant current device; and
controlling the resistance of an equalizing device based on the current acquisition signal so as to keep the load voltage of the constant current device unchanged, wherein the equalizing device is connected in series with a light source to be dimmed, the equalizing device and the light source to be dimmed form a load unit together, and the load unit is connected in series with the constant current device;
the preset system inherent dimming parameters comprise:
measuring the real-time output current of the constant current device and the real-time voltage at two ends of the light source to be dimmed in the process that the real-time output current of the constant current device rises from 0 to a peak value, and establishing and pre-storing a functional relation of the real-time voltage at two ends of the light source to be dimmed with respect to the real-time output current of the constant current device; and
measuring the load voltage of the constant current device when the constant current device is fully loaded;
controlling the resistance of the equalizing device based on the current collecting signal, comprising:
determining a real-time resistance to be achieved by the balancing device based on a functional relation of real-time voltage at two ends of the light source to be dimmed with respect to real-time output current of the constant current device, a load voltage of the constant current device when the constant current device is fully loaded, and the real-time output current of the constant current device represented by the current acquisition signal;
the real-time resistance that the equalization device should reach is calculated by the following equation:
；
wherein the method comprises the steps of，Representing the real-time resistance that the equalizing device should reach; />A load voltage for the constant current device;representing the real-time output current of the constant current device; />A functional relation representing the real-time voltage across the dimmed light source with respect to the real-time output current of the constant current device; and in the process of controlling the resistance of the balancing device based on the current acquisition signal, the load voltage of the constant current device is kept to be the load voltage when the constant current device is fully loaded.
2. The dimmer lamp control method as claimed in claim 1, wherein the dimmer parameter input data is received by the control device during the process of receiving the dimmer parameter input data, the PWM dimmer signal is outputted to the constant current device by the control device during the process of outputting the PWM dimmer signal based on the dimmer parameter input data, wherein the control device is connected to the constant current device, the constant current device is connected in series with the equalization device, and the equalization device is connected to the control device; and in the process of receiving the current acquisition signal, the control device is used for receiving the current acquisition signal from the current acquisition module, wherein the current acquisition module is connected in series with the constant current device and is connected with the control device.
3. The dimmer lamp control method as claimed in claim 1, wherein the equalizing device is a digital potentiometer, and the constant current device has a basic topology of BUCK topology.
4. A dimming lamp control method with smooth dark part is characterized by comprising the following steps:
presetting inherent dimming parameters of a system;
receiving dimming parameter input data;
outputting a PWM dimming signal based on the dimming parameter input data;
receiving a current acquisition signal, wherein the current acquisition signal characterizes real-time output current of the constant current device;
receiving a voltage acquisition signal, wherein the voltage acquisition signal represents real-time voltage at two ends of the light source to be dimmed; and
controlling the resistance of an equalization device based on the current acquisition signal and the voltage acquisition signal so as to keep the load voltage of the constant current device unchanged, wherein the equalization device is connected in series with a light source to be dimmed, the equalization device and the light source to be dimmed form a load unit together, and the load unit is connected in series with the constant current device;
presetting system inherent dimming parameters, which comprises the following steps: measuring the load voltage of the constant current device when the constant current device is fully loaded through a voltage acquisition module;
controlling the resistance of the equalizing device based on the current collecting signal and the voltage collecting signal, comprising:
measuring real-time voltage at two ends of the dimmed light source through the voltage acquisition module; and
determining a real-time resistance to be achieved by the balancing device based on the real-time voltage at two ends of the light source to be dimmed, the load voltage when the constant current device is fully loaded, and the real-time output current of the constant current device;
the real-time resistance that the equalization device should reach is calculated by the following equation:
；
wherein,representing the real-time resistance that the equalizing device should reach; />A load voltage for the constant current device;representing the real-time output current of the constant current device; />Representing real-time voltages across the dimmed light source measured by the voltage acquisition module; and in the process of controlling the resistance of the balancing device based on the current acquisition signal and the voltage acquisition signal, the load voltage of the constant current device is kept to be the load voltage when the constant current device is fully loaded.
5. The dimming lamp control method of claim 4, wherein the voltage acquisition module is connected in parallel with the light source being dimmed.
6. The dimmer lamp control method as claimed in claim 5, wherein the dimmer parameter input data is received by the control device during the process of receiving the dimmer parameter input data, the PWM dimmer signal is outputted to the constant current device by the control device during the process of outputting the PWM dimmer signal based on the dimmer parameter input data, wherein the control device is connected to the constant current device, the constant current device is connected in series with the equalization device, and the equalization device is connected to the control device; in the process of receiving the current acquisition signal, receiving the current acquisition signal from a current acquisition module through the control device, wherein the current acquisition module is connected in series with the constant current device and is connected with the control device; in the process of receiving the voltage acquisition signal, the control device receives the voltage acquisition signal from the voltage acquisition module; the voltage acquisition module is connected to the control device, the balancing device is a digital potentiometer, and the basic topology of the constant current device is BUCK topology.
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