CN105430814B - LED light temperature compensation control method, device and system - Google Patents
LED light temperature compensation control method, device and system Download PDFInfo
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- CN105430814B CN105430814B CN201511023277.7A CN201511023277A CN105430814B CN 105430814 B CN105430814 B CN 105430814B CN 201511023277 A CN201511023277 A CN 201511023277A CN 105430814 B CN105430814 B CN 105430814B
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- 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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Abstract
The invention discloses a kind of LED light temperature compensation control method, device and system.This method includes：Obtain the junction temperature of current red wick, junction temperature and the correspondence of red wick relative luminous intensity according to the red wick prestored, calculate the current red wick relative luminous intensity corresponding to the junction temperature of current red wick, the value that the actual luminous intensity of red wick obtains when the actual luminous intensity of red wick divided by junction temperature are reference temperature when red wick relative luminous intensity is current junction temperature, by reference PWM duty cycle set in advance divided by current red wick relative luminous intensity, obtain PWM and correct duty cycle, with reference to the duty cycle of the junction temperature that PWM duty cycle the is red wick pwm signal corresponding in reference temperature, output duty cycle for PWM correction values pwm signal to driver, the break-make of the red wick of control.The present invention can ensure that the light intensity of atmosphere lamp and colour temperature are held essentially constant at different temperatures, so as to lift user experience.
Description
Technical field
The present invention relates to electronic technology field, more particularly to a kind of LED light temperature compensation control method, device and system.
Background technology
At present, the intelligent atmosphere lamp of vehicle selects rgb color pattern LED (Light Emitting Diode, light-emitting diodes
Pipe) lamp, rgb color pattern LED light is generally driven using constant-current source, and utilizes PWM (Pulse Width Modulation, arteries and veins
Rush width modulated) realize the adjusting of the different colours of atmosphere lamp and light intensity.
But the luminous intensity (abbreviation light intensity) of rgb color pattern LED light changes with the change of temperature, wherein, it is red
The light intensity of colored lights core is obvious with the change decay of temperature, and green wick and blue wick are then decayed smaller, can be neglected
Slightly disregard.And current control method can not compensate the light intensity attenuation brought by temperature change, therefore, it is impossible to ensure intelligent atmosphere
The light intensity and colour temperature of lamp are held essentially constant at different temperatures, influence user experience.
The content of the invention
In view of this, the present invention provides a kind of LED light temperature compensation control method, device and system, intelligence can be ensured
The light intensity and colour temperature of energy atmosphere lamp are held essentially constant at different temperatures, so as to lift user experience.
To achieve the above object, the present invention provides following technical solution：
A kind of LED light temperature compensation control method, method include：
Obtain the junction temperature of current red wick；
The junction temperature and the correspondence of the red wick relative luminous intensity for the red wick that foundation prestores,
Calculate the current red wick relative luminous intensity corresponding to the junction temperature of the current red wick；The red wick is opposite to be sent out
The red wick is real when the actual luminous intensity of the red wick divided by junction temperature are reference temperature when luminous intensity is current junction temperature
The value that border luminous intensity obtains；The correspondence is divided into continuous preset number according to the value of the junction temperature of the red wick
Cross-talk correspondence, every section of sub- correspondence are different；
By reference PWM duty cycle set in advance divided by the current red wick relative luminous intensity, PWM amendments are obtained
Duty cycle；Described to be with reference to PWM duty cycle, the junction temperature of the red wick is in the reference temperature, with the red wick
The duty cycle of corresponding pwm signal；
Output duty cycle for the PWM correction values pwm signal to driver, control the break-make of the red wick.
Preferably, the junction temperature for obtaining current red wick, including：
The resistance value for the thermistor for being arranged on the red wick pad locations that measurement obtains is obtained, is calculated described
The junction temperature of red wick；
Or the temperature for the red wick surrounding environment that measurement obtains is obtained, pass through the red wick surrounding environment
Temperature computation obtain the junction temperature of the red wick；
Or the temperature of controller is obtained, the red wick surrounding environment is obtained by the temperature computation of the controller
Temperature, the junction temperature of the red wick is obtained by the temperature computation of the red wick surrounding environment；
Or obtain the voltage at the red wick both ends that measurement obtains, calculate the voltage at the red wick both ends with
The difference of the voltage at red wick both ends during reference temperature, it is corresponding with the junction temperature of the red wick according to the difference
Relation, determines the junction temperature of the red wick.
Preferably, the junction temperature for the red wick that the foundation prestores and the red wick relative luminous intensity
Correspondence, before calculating the current red wick relative luminous intensity corresponding to the junction temperature of the current red wick, also
Including：
Obtain and store the junction temperature and pair of the red wick relative luminous intensity of the red wick input by user
It should be related to.
Preferably, the reference temperature is 25 degrees Celsius.
A kind of LED light temperature compensation and control device, including：
First acquisition module, for obtaining the junction temperature of current red wick；
First computing module, for the junction temperature hair opposite with the red wick according to the red wick prestored
The correspondence of luminous intensity, calculates the current red wick relative luminous intensity corresponding to the junction temperature of the current red wick；
The red wick relative luminous intensity when being current junction temperature the actual luminous intensity of the red wick divided by junction temperature be with reference to temperature
The value that the red actual luminous intensity of wick obtains when spending；The correspondence is according to the value of the junction temperature of the red wick
It is divided into continuous preset number cross-talk correspondence, every section of sub- correspondence is different；
Second computing module, for reference PWM duty cycle set in advance divided by the current red wick to be sent out relatively
Luminous intensity, obtains PWM and corrects duty cycle；Described to be with reference to PWM duty cycle, the junction temperature of the red wick is in the reference temperature
When, the duty cycle with the corresponding pwm signal of the red wick；
Drive module, for output duty cycle for the PWM correction values pwm signal to driver, it is described red to control
The break-make of colored lights core.
Preferably, first acquisition module includes：
First acquisition unit, the thermistor for being arranged on the red wick pad locations obtained for obtaining measurement
Resistance value, is calculated the junction temperature of the red wick；
Or second acquisition unit, the temperature of the red wick surrounding environment obtained for obtaining measurement, passes through institute
The temperature computation for stating red wick surrounding environment obtains the junction temperature of the red wick；
Or the 3rd acquiring unit, for obtaining the temperature of controller, obtained by the temperature computation of the controller described
The temperature of red wick surrounding environment, the knot of the red wick is obtained by the temperature computation of the red wick surrounding environment
Temperature；
Or the 4th acquiring unit, the voltage at the red wick both ends obtained for obtaining measurement, calculates described red
The difference of the voltage at the red wick both ends when voltage and reference temperature at colored lights core both ends, according to the difference with it is described red
The correspondence of the junction temperature of colored lights core, determines the junction temperature of the red wick.
Preferably, further include：
Second acquisition module, for the junction temperature for obtaining and storing the red wick input by user and the red wick
The correspondence of relative luminous intensity.
Preferably, the reference temperature is 25 degrees Celsius.
A kind of LED light function of temperature compensation control system, including：
Controller, the driver being connected with the controller, the LED light being connected with the driver；
The operation of the controller includes：Obtain the junction temperature of current red wick；According to the red colored lamp prestored
The junction temperature of core and the correspondence of the red wick relative luminous intensity, corresponding to the junction temperature for calculating the current red wick
Current red wick relative luminous intensity；The correspondence is divided into continuously according to the value of the junction temperature of the red wick
Preset number cross-talk correspondence, every section of sub- correspondence are different；Will be set in advance with reference to PWM duty cycle divided by described
Current red wick relative luminous intensity, obtains PWM and corrects duty cycle；It is described to be with reference to PWM duty cycle, the red wick
Junction temperature is in reference temperature, the duty cycle with the corresponding pwm signal of the red wick；Output duty cycle is repaiied for the PWM
On the occasion of pwm signal to driver, control the break-make of the red wick.
It can be seen via above technical scheme that compared with prior art, the present invention provides a kind of LED light temperature-compensating control
Methods, devices and systems processed.Technical solution provided by the invention, obtains the junction temperature of current red wick first, and foundation is deposited in advance
(correspondence is according to institute with the correspondence of the red wick relative luminous intensity for the junction temperature of the red wick of storage
The value for stating the junction temperature of red wick is divided into continuous preset number cross-talk correspondence, and every section of sub- correspondence is different),
The current red wick relative luminous intensity corresponding to the junction temperature of the current red wick is calculated, and the red wick is opposite
Red wick when the actual luminous intensity of the red wick divided by junction temperature are reference temperature when luminous intensity is current junction temperature
The value that actual luminous intensity obtains, the value are a ratio value, and it is real to characterize relative to junction temperature red wick when being reference temperature
Border luminous intensity, the specific ratio that the red actual luminous intensity of wick decays to, PWM duty cycle is referred to by set in advance
(described to be with reference to PWM duty cycle, the junction temperature of the red wick is in reference temperature, with the corresponding PWM of the red wick
The duty cycle of signal) divided by the current red wick relative luminous intensity, obtain PWM and correct duty cycle, specifically, PWM is accounted for
It is empty more proportional than with luminous intensity, but red wick varies with temperature light intensity attenuation, and therefore, the PWM corrects duty cycle
Be multiplied by after the current red wick relative luminous intensity should with it is set in advance equal with reference to PWM duty cycle, so can
Ensure variation with temperature, be output to the pwm signal duty cycle of red wick after attenuation portions are offset, still with it is set in advance
It is equal with reference to PWM duty cycle, therefore, by reference PWM duty cycle set in advance divided by the current red wick relative luminous
Intensity, just can obtain PWM and correct duty cycle, last output duty cycle for the PWM correction values pwm signal to driver,
Control the break-make of the red wick.That is, using technical solution provided by the invention, it can ensure the change with junction temperature
The luminous intensity for changing the red wick is held essentially constant, and the luminous intensity of the green wick of LED and blue wick is tied
Temperature influence is smaller, is also held essentially constant, so that the summation of light intensity is held essentially constant, further, since red, green and blue colored lights
The luminous intensity substantially constant of core, with variations injunction temperature, as long as the ratio of three's light intensity remains unchanged, colour temperature is just basically unchanged.
Therefore, using technical solution provided by the invention, it can ensure that the light intensity of intelligent atmosphere lamp and colour temperature are basic at different temperatures
Keep constant, so as to lift user experience.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is attached drawing needed in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
The embodiment of invention, for those of ordinary skill in the art, without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is a kind of flow chart of LED light temperature compensation control method provided in an embodiment of the present invention；
Fig. 2 is the correspondence curve map of the first difference and the junction temperature of the red wick；
Fig. 3 is the optical indicatrix figure of certain rgb color pattern red wick；
Fig. 4 is a kind of structure chart of LED light temperature compensation and control device provided in an embodiment of the present invention.
Embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without making creative work
Embodiment, belongs to the scope of protection of the invention.
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, it is below in conjunction with the accompanying drawings and specific real
Applying mode, the present invention is described in further detail.
Embodiment
Referring to Fig. 1, Fig. 1 is a kind of flow chart of LED light temperature compensation control method provided in an embodiment of the present invention.Such as
Shown in Fig. 1, this method includes：
Step S101, obtains the junction temperature of current red wick；
Specifically, technical solution provided in an embodiment of the present invention, corresponding to rgb color pattern LED light, rgb color pattern
LED light includes red wick, green wick and blue wick.I.e. described (step S101) obtains the junction temperature of current red wick,
Namely obtain the junction temperature of current LED light red wick.
Specifically, the step S101 can include:
The resistance value for the thermistor for being arranged on the red wick pad locations that measurement obtains is obtained, is calculated described
The junction temperature of red wick；
Or the temperature for the red wick surrounding environment that measurement obtains is obtained, pass through the red wick surrounding environment
Temperature computation obtain the junction temperature of the red wick；
Optionally, by the thermistor being arranged near the red wick, measurement is obtained around the red wick
The temperature T of environmentRing, then pass through the temperature T of the red wick surrounding environmentRingThe junction temperature of the red wick is calculated
TKnot：
TKnot=TRing+ LED light consumption power * (thermal resistance between environment and LED light PN junction).(1)
Or obtain the temperature T of controllerMCU, by the temperature T of the controllerMCUIt is calculated around the red wick
The temperature T of environmentRing, pass through the temperature T of the red wick surrounding environmentRingThe junction temperature T of the red wick is calculatedKnot；
Specifically, TRing=TMCU- MCU consumption power * (thermal resistance between environment and MCU)；(2)
Wherein, MCU refers to controller.T is calculated by (2) formulaRingAfterwards, T can be calculated further according to (1) formulaKnot。
Or obtain the voltage at the red wick both ends that measurement obtains, calculate the voltage at the red wick both ends with
The difference (referred to as the first difference) of the voltage at red wick both ends during reference temperature, according to the difference and the red colored lamp
The correspondence of the junction temperature of core, determines the junction temperature of the red wick；
Specifically, as shown in Fig. 2, Fig. 2 is the correspondence curve map of the first difference and the junction temperature of the red wick.Can
Choosing, which obtains from the Datasheet (basic parameter) of LED light.
Step S102, junction temperature and the red wick relative luminous intensity according to the red wick prestored
Correspondence, calculates the current red wick relative luminous intensity corresponding to the junction temperature of the current red wick；
Specifically, the red wick relative luminous intensity when be current junction temperature the red actual luminous intensity of wick remove
The value that the red actual luminous intensity of wick obtains during using junction temperature as reference temperature, which is a ratio value, and characterization is described red
The tool that the actual luminous intensity of colored lights core (the red wick actual luminous intensity when relative to junction temperature being reference temperature) decays to
Body ratio.Optionally, the reference temperature is 25 degrees Celsius.
Specifically, the junction temperature of the red wick and the correspondence of the red wick relative luminous intensity, according to institute
The value for stating the junction temperature of red wick is divided into continuous preset number cross-talk correspondence, and every section of sub- correspondence is different.
Optionally, every section of sub- correspondence is linear corresponding relation.
Referring to Fig. 3, Fig. 3 is the optical indicatrix figure of certain rgb color pattern red wick, the optical indicatrix figure
It is widely used in the LED light (red wick) of rgb color pattern.As seen from Figure 3, the luminous intensity of red wick is with temperature
The change decay of degree is obvious.By taking Fig. 3 as an example, since attenuation trend and the variations injunction temperature of red wick luminous intensity are in non-thread
Sexual intercourse, therefore the temperature-compensating for red wick also can be correspondingly arranged different compensation dynamics according to its actual junction temperature Tj；
Assuming that the light intensity change that junction temperature often rises 1 degree Celsius of red wick turns to a (- 1%<a<0) it is different, according to different LED junction temperature Tj
The calculation formula of a is as follows under temperature range：
A1=[Iv ' (- 40)-Iv ' (- 10)]/- 30, -40≤Tj<-10； (3)
A2=[Iv ' (- 10)-Iv ' (10)]/- 20, -10≤Tj<10； (4)
A3=[Iv ' (10)-Iv ' (40)]/- 30,10≤Tj<40； (5)
A4=[Iv ' (40)-Iv ' (80)]/- 40,40≤Tj≤80； (6)
Wherein, Iv ' refers to the relative value of LED light luminous intensity, and luminous intensity when Iv ' (- 40) is exactly -40 degrees Celsius is removed
The value that luminous intensity during with 25 degrees Celsius obtains.The data source of Iv ' is in the Datasheet of every LED lamp.
The then meter of the current red wick relative luminous intensity Iv ' (Tj) corresponding to the junction temperature Tj of the current red wick
Calculate formula (junction temperature of the i.e. described red wick prestored and the corresponding pass of the red wick relative luminous intensity
System) be：
Iv ' (Tj)=Iv ' (- 10)+a1 × (Tj+10), -40≤Tj<-10； (7)
Iv ' (Tj)=Iv ' (10)+a2 × (Tj-10), -10≤Tj<10； (8)
Iv ' (Tj)=Iv ' (40)+a3 × (Tj-40), 10≤Tj<40； (9)
Iv ' (Tj)=Iv ' (80)+a4 × (Tj-80), 40≤Tj≤80； (10)
According to above-mentioned formula, the current red colored lamp corresponding to the junction temperature Tj of the current red wick just can be calculated
Core relative luminous intensity Iv ' (Tj).
Step S103, reference PWM duty cycle set in advance divided by the current red wick relative luminous intensity obtain
Duty cycle is corrected to PWM；
Specifically, described refer to reference to PWM duty cycle, the junction temperature of the red wick is in the reference temperature, with institute
State the duty cycle of corresponding (i.e. to be delivered to the red wick) pwm signal of red wick.Optionally, it is described with reference to temperature
Spend for 25 degrees Celsius.
Specifically, to when the red wick of pwm signal control of PWM amendment duty cycles is worked, red wick shines
Brightness is held essentially constant, then needs to ensure that the PWM amendments duty cycle can compensate for red wick and shine in temperature change
The decay of brightness.Since under normal circumstances, PWM duty cycle is directly proportional to luminosity, therefore, the ratio between luminosity,
The ratio between PWM duty cycle can be converted to.It is described set in advance to refer to PWM specifically, it is c that if PWM, which corrects duty cycle,
Duty cycle is b, and the current red wick relative luminous intensity is Iv ' (Tj), then can determine：
C × Iv ' (Tj)=b (11)
So as to c=b/Iv ' (Tj) (12).
Step S104, output duty cycle for the PWM correction values pwm signal to driver, control the red wick
Break-make；
Specifically, controller output duty cycle drives for pwm signal to driver, the control driver of the PWM correction values
The break-make of the dynamic red wick.
Optionally, technical solution provided in an embodiment of the present invention, the reference temperature is 25 degrees Celsius, with reference temperature phase
Corresponding reference forward current IFFor 20mA.
Using technical solution provided in an embodiment of the present invention, can ensure with the hair of the change of the junction temperature red wick
Luminous intensity is held essentially constant, and the luminous intensity of the green wick of LED and blue wick influenced by junction temperature it is smaller, it is also basic to protect
Hold it is constant so that the summation of light intensity is held essentially constant, further, since the luminous intensity of red, green and blue wick is substantially permanent
Fixed, with variations injunction temperature, as long as the ratio of three's light intensity remains unchanged, colour temperature is just basically unchanged.Therefore, provided using the present invention
Technical solution, the light intensity and colour temperature that can ensure intelligent atmosphere lamp are held essentially constant at different temperatures, so as to lift use
Experience at family.
The LED light temperature compensation control method that another embodiment of the present invention provides, optionally, the step S102 it
Before, further include：
Obtain and store the junction temperature and pair of the red wick relative luminous intensity of the red wick input by user
It should be related to.
In order to illustrate technical solution provided by the invention more fully hereinafter, corresponding to LED light provided in an embodiment of the present invention
Temperature compensation control method, the present invention disclose a kind of LED light temperature compensation and control device.
Referring to Fig. 4, Fig. 4 is a kind of structure chart of LED light temperature compensation and control device provided in an embodiment of the present invention.Such as
Shown in Fig. 4, which includes：
First acquisition module 401, for obtaining the junction temperature of current red wick；
First computing module 402, for the junction temperature according to the red wick prestored and the red wick phase
To the correspondence of luminous intensity, the current red wick relative luminous calculated corresponding to the junction temperature of the current red wick is strong
Degree；The red wick relative luminous intensity when being current junction temperature the actual luminous intensity of the red wick divided by junction temperature be reference
The value that the red actual luminous intensity of wick obtains during temperature；The correspondence takes according to the junction temperature of the red wick
Value is divided into continuous preset number cross-talk correspondence, and every section of sub- correspondence is different；
Second computing module 403, for reference PWM duty cycle set in advance divided by the current red wick is opposite
Luminous intensity, obtains PWM and corrects duty cycle；Described to be with reference to PWM duty cycle, the junction temperature of the red wick is in the reference temperature
When spending, the duty cycle with the corresponding pwm signal of the red wick；
Drive module 404, for output duty cycle for the PWM correction values pwm signal to driver, with described in control
The break-make of red wick.
Optionally, the reference temperature is 25 degrees Celsius.
Using LED light temperature compensation and control device provided in an embodiment of the present invention, it can ensure the change institute with junction temperature
The luminous intensity for stating red wick is held essentially constant, and the luminous intensity of the green wick of LED and blue wick is by junction temperature shadow
Sound is smaller, is also held essentially constant, so that the summation of light intensity is held essentially constant, further, since red, green and blue wick
Luminous intensity substantially constant, with variations injunction temperature, as long as the ratio of three's light intensity remains unchanged, colour temperature is just basically unchanged.Therefore,
Using technical solution provided by the invention, it can ensure that the light intensity of intelligent atmosphere lamp and colour temperature keep permanent substantially at different temperatures
It is fixed, so as to lift user experience.
Optionally, LED light temperature compensation and control device provided in an embodiment of the present invention, first acquisition module 401 wrap
Include：
First acquisition unit, the thermistor for being arranged on the red wick pad locations obtained for obtaining measurement
Resistance value, is calculated the junction temperature of the red wick；
Or second acquisition unit, the temperature of the red wick surrounding environment obtained for obtaining measurement, passes through institute
The temperature computation for stating red wick surrounding environment obtains the junction temperature of the red wick；
Or the 3rd acquiring unit, for obtaining the temperature of controller, obtained by the temperature computation of the controller described
The temperature of red wick surrounding environment, the knot of the red wick is obtained by the temperature computation of the red wick surrounding environment
Temperature；
Or the 4th acquiring unit, the voltage at the red wick both ends obtained for obtaining measurement, calculates described red
The difference of the voltage at the red wick both ends when voltage and reference temperature at colored lights core both ends, according to the difference with it is described red
The correspondence of the junction temperature of colored lights core, determines the junction temperature of the red wick.
Optionally, the LED light temperature compensation and control device that another embodiment of the present invention provides, further includes：
Second acquisition module, for the junction temperature for obtaining and storing the red wick input by user and the red wick
The correspondence of relative luminous intensity.
In order to illustrate technical solution provided by the invention more fully hereinafter, invention additionally discloses a kind of LED light temperature-compensating
Control system.
LED light function of temperature compensation control system provided in an embodiment of the present invention, including：
Controller, the driver being connected with the controller, the LED light being connected with the driver；
The operation of the controller includes：Obtain the junction temperature of current red wick；According to the red colored lamp prestored
The junction temperature of core and the correspondence of the red wick relative luminous intensity, corresponding to the junction temperature for calculating the current red wick
Current red wick relative luminous intensity；The correspondence is divided into continuously according to the value of the junction temperature of the red wick
Preset number cross-talk correspondence, every section of sub- correspondence are different；Will be set in advance with reference to PWM duty cycle divided by described
Current red wick relative luminous intensity, obtains PWM and corrects duty cycle；It is described to be with reference to PWM duty cycle, the red wick
Junction temperature is in reference temperature, the duty cycle with the corresponding pwm signal of the red wick；Output duty cycle is repaiied for the PWM
On the occasion of pwm signal to driver, control the break-make of the red wick.
Optionally, the LED light function of temperature compensation control system that another embodiment of the present invention provides, the behaviour of the controller
Further include：
Obtain and store the junction temperature and pair of the red wick relative luminous intensity of the red wick input by user
It should be related to.
It can be seen via above technical scheme that compared with prior art, the present invention provides a kind of LED light temperature-compensating control
Methods, devices and systems processed.Technical solution provided by the invention, obtains the junction temperature of current red wick first, and foundation is deposited in advance
(correspondence is according to institute with the correspondence of the red wick relative luminous intensity for the junction temperature of the red wick of storage
The value for stating the junction temperature of red wick is divided into continuous preset number cross-talk correspondence, and every section of sub- correspondence is different),
The current red wick relative luminous intensity corresponding to the junction temperature of the current red wick is calculated, and the red wick is opposite
Red wick when the actual luminous intensity of the red wick divided by junction temperature are reference temperature when luminous intensity is current junction temperature
The value that actual luminous intensity obtains, the value are a ratio value, and it is real to characterize relative to junction temperature red wick when being reference temperature
Border luminous intensity, the specific ratio that the red actual luminous intensity of wick decays to, PWM duty cycle is referred to by set in advance
(described to be with reference to PWM duty cycle, the junction temperature of the red wick is in reference temperature, with the corresponding PWM of the red wick
The duty cycle of signal) divided by the current red wick relative luminous intensity, obtain PWM and correct duty cycle, specifically, PWM is accounted for
It is empty more proportional than with luminous intensity, but red wick varies with temperature light intensity attenuation, and therefore, the PWM corrects duty cycle
Be multiplied by after the current red wick relative luminous intensity should with it is set in advance equal with reference to PWM duty cycle, so can
Ensure variation with temperature, be output to the pwm signal duty cycle of red wick after attenuation portions are offset, still with it is set in advance
It is equal with reference to PWM duty cycle, therefore, by reference PWM duty cycle set in advance divided by the current red wick relative luminous
Intensity, just can obtain PWM and correct duty cycle, last output duty cycle for the PWM correction values pwm signal to driver,
Control the break-make of the red wick.That is, using technical solution provided by the invention, it can ensure the change with junction temperature
The luminous intensity for changing the red wick is held essentially constant, and the luminous intensity of the green wick of LED and blue wick is tied
Temperature influence is smaller, is also held essentially constant, so that the summation of light intensity is held essentially constant, further, since red, green and blue colored lights
The luminous intensity substantially constant of core, with variations injunction temperature, as long as the ratio of three's light intensity remains unchanged, colour temperature is just basically unchanged.
Therefore, using technical solution provided by the invention, it can ensure that the light intensity of intelligent atmosphere lamp and colour temperature are basic at different temperatures
Keep constant, so as to lift user experience.
Finally, it is to be noted that, herein, relational terms such as first and second and the like be used merely to by
One entity or operation are distinguished with another entity or operation, without necessarily requiring or implying these entities or operation
Between there are any actual relationship or order.Moreover, term " comprising ", "comprising" or its any other variant meaning
Covering non-exclusive inclusion, so that process, method, article or equipment including a series of elements not only include that
A little key elements, but also including other elements that are not explicitly listed, or further include for this process, method, article or
The intrinsic key element of equipment.In the absence of more restrictions, the key element limited by sentence "including a ...", is not arranged
Except also there are other identical element in the process, method, article or apparatus that includes the element.
Each embodiment is described by the way of progressive in this specification, what each embodiment stressed be and other
The difference of embodiment, between each embodiment identical similar portion mutually referring to.For device disclosed in embodiment
For system, since it is corresponded to the methods disclosed in the examples, so description is fairly simple, related part is referring to method
Part illustrates.
The foregoing description of the disclosed embodiments, enables professional and technical personnel in the field to realize or use the present invention.
A variety of modifications to these embodiments will be apparent for those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, it is of the invention
The embodiments shown herein is not intended to be limited to, and is to fit to and the principles and novel features disclosed herein phase one
The most wide scope caused.
Claims (9)
1. a kind of LED light temperature compensation control method, it is characterised in that method includes：
Obtain the junction temperature of current red wick；
According to the junction temperature and the correspondence of the red wick relative luminous intensity of the red wick prestored, calculate
Current red wick relative luminous intensity corresponding to the junction temperature of the current red wick；The red wick relative luminous is strong
Spend for current junction temperature when the actual luminous intensity of the red wick divided by junction temperature be reference temperature when the actual hair of the red wick
The value that luminous intensity obtains；The correspondence is divided into continuous preset number cross-talk according to the value of the junction temperature of the red wick
Correspondence, every section of sub- correspondence are different；
By reference pulse width modulated PWM duty cycle set in advance divided by the current red wick relative luminous intensity, obtain
Duty cycle is corrected to pulse width modulation (PWM)；The reference pulse width modulated PWM duty cycle is the knot of the red wick
Temperature is in the reference temperature, the duty cycle with the corresponding pulse width modulation (PWM) signal of the red wick；
Output duty cycle for the pulse width modulation (PWM) correction value pulse width modulation (PWM) signal to driver, control institute
State the break-make of red wick.
2. according to the method described in claim 1, it is characterized in that, the junction temperature for obtaining current red wick, including：
The resistance value for the thermistor for being arranged on the red wick pad locations that measurement obtains is obtained, the red is calculated
The junction temperature of wick；
Or the temperature for the red wick surrounding environment that measurement obtains is obtained, pass through the temperature of the red wick surrounding environment
The junction temperature of the red wick is calculated in degree；
Or the temperature of controller is obtained, the temperature of the red wick surrounding environment is obtained by the temperature computation of the controller
Degree, the junction temperature of the red wick is obtained by the temperature computation of the red wick surrounding environment；
Or the voltage at the red wick both ends that measurement obtains is obtained, calculate voltage and the reference at the red wick both ends
The difference of the voltage at red wick both ends during temperature, the corresponding pass according to the difference with the junction temperature of the red wick
System, determines the junction temperature of the red wick.
3. the according to the method described in claim 1, it is characterized in that, junction temperature for the red wick that the foundation prestores
With the correspondence of the red wick relative luminous intensity, calculate current red corresponding to the junction temperature of the current red wick
Before colored lights core relative luminous intensity, further include：
Obtain and store the junction temperature of the red wick input by user and the corresponding pass of the red wick relative luminous intensity
System.
4. according to claims 1 to 3 any one of them method, it is characterised in that the reference temperature is 25 degrees Celsius.
A kind of 5. LED light temperature compensation and control device, it is characterised in that including：
First acquisition module, for obtaining the junction temperature of current red wick；
First computing module is strong for the junction temperature according to the red wick prestored and the red wick relative luminous
The correspondence of degree, calculates the current red wick relative luminous intensity corresponding to the junction temperature of the current red wick；It is described
Red wick relative luminous intensity is when the actual luminous intensity of the red wick divided by junction temperature are reference temperature when being current junction temperature
The value that the red actual luminous intensity of wick obtains；The correspondence is divided into according to the value of the junction temperature of the red wick
Continuous preset number cross-talk correspondence, every section of sub- correspondence are different；
Second computing module, for by reference pulse width modulated PWM duty cycle set in advance divided by the current red colored lamp
Core relative luminous intensity, obtains pulse width modulation (PWM) and corrects duty cycle；The reference pulse width modulated PWM duty cycle is,
The junction temperature of the red wick is in the reference temperature, with the corresponding pulse width modulation (PWM) signal of the red wick
Duty cycle；
Drive module, for output duty cycle for the pulse width modulation (PWM) correction value pulse width modulation (PWM) signal extremely
Driver, to control the break-make of the red wick.
6. device according to claim 5, it is characterised in that first acquisition module includes：
First acquisition unit, the resistance of the thermistor for being arranged on the red wick pad locations obtained for obtaining measurement
Value, is calculated the junction temperature of the red wick；
Or second acquisition unit, the temperature of the red wick surrounding environment obtained for obtaining measurement, by described red
The temperature computation of colored lights core surrounding environment obtains the junction temperature of the red wick；
Or the 3rd acquiring unit, for obtaining the temperature of controller, the red is obtained by the temperature computation of the controller
The temperature of wick surrounding environment, the junction temperature of the red wick is obtained by the temperature computation of the red wick surrounding environment；
Or the 4th acquiring unit, the voltage at the red wick both ends obtained for obtaining measurement, calculates the red colored lamp
The difference of the voltage at the red wick both ends when voltage and reference temperature at core both ends, according to the difference and the red colored lamp
The correspondence of the junction temperature of core, determines the junction temperature of the red wick.
7. device according to claim 5, it is characterised in that further include：
Second acquisition module, the junction temperature for obtaining and storing the red wick input by user are opposite with the red wick
The correspondence of luminous intensity.
8. according to claim 5~7 any one of them device, it is characterised in that the reference temperature is 25 degrees Celsius.
A kind of 9. LED light function of temperature compensation control system, it is characterised in that including：
Controller, the driver being connected with the controller, the LED light being connected with the driver；
The operation of the controller includes：Obtain the junction temperature of current red wick；According to the red wick prestored
Junction temperature and the correspondence of the red wick relative luminous intensity, calculate working as corresponding to the junction temperature of the current red wick
Preceding red wick relative luminous intensity；The correspondence is divided into continuous default according to the value of the junction temperature of the red wick
Number cross-talk correspondence, every section of sub- correspondence are different；By reference pulse width modulated PWM duty cycle set in advance
Divided by the current red wick relative luminous intensity, obtain pulse width modulation (PWM) and correct duty cycle；The reference pulse is wide
Degree modulation (PWM) duty cycle is that the junction temperature of the red wick is wide with the corresponding pulse of the red wick in reference temperature
Spend the duty cycle of modulation (PWM) signal；Output duty cycle is the pulse width modulation (PWM) of the pulse width modulation (PWM) correction value
Signal controls the break-make of the red wick to driver.
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| CN106132002B (en) * | 2016-06-27 | 2018-11-02 | 佛山市毅丰电器实业有限公司 | Control LED light color color-mixture device and its method |
| FR3063198B1 (en) * | 2017-02-23 | 2019-04-19 | Valeo Vision | METHOD AND CONTROL MODULE FOR LUMINOUS SOURCES WITH PULSE LUMINOUS FLUX OF A MOTOR VEHICLE |
| CN108184285A (en) * | 2017-12-19 | 2018-06-19 | 生迪智慧科技有限公司 | Feux rouges compensation method, device and RGB lamps based on RGB lamps |
| CN109963377B (en) * | 2017-12-22 | 2021-03-23 | 上海北汇信息科技有限公司 | Multicolor LED lamp and control method and device thereof |
| CN109410488B (en) * | 2018-07-06 | 2020-10-16 | 北京西门子西伯乐斯电子有限公司 | Light alarm and light intensity compensation method thereof |
| CN109100306A (en) * | 2018-07-31 | 2018-12-28 | 广东美的制冷设备有限公司 | Cleanliness detection method, device and computer readable storage medium |
| CN109443533B (en) * | 2018-10-31 | 2021-06-29 | 天津经纬恒润科技有限公司 | Method and device for calibrating backlight brightness of switch panel |
| CN111988531B (en) * | 2019-05-21 | 2022-07-08 | 北京小米移动软件有限公司 | Light supplementing module, light supplementing control method of light supplementing module, terminal and device |
| CN112599095B (en) * | 2020-12-31 | 2021-10-15 | 南京国兆光电科技有限公司 | OLED micro-display brightness compensation method and system based on temperature feedback |
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