CN105873309B - Multi-stage dimming method and device for LED lamp - Google Patents
Multi-stage dimming method and device for LED lamp Download PDFInfo
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Abstract
The invention discloses a multistage dimming method and a multistage dimming device for an LED lamp, which comprise the following steps: generating a pulse width modulation signal with a first duty ratio and a pulse width modulation signal with a second duty ratio according to a dimming value input by a user; alternately and circularly outputting the pulse width modulation signal with the first duty ratio and the pulse width modulation signal with the second duty ratio according to a preset time interval to obtain a pulse width modulation signal with a third duty ratio; and modulating the current of the LED according to the pulse width modulation signal with the third duty ratio. By adopting the invention, the dimming level of the LED lamp can be increased, and the smooth adjustment of the brightness of the LED lamp is realized.
Description
Technical Field
The present invention relates to the field of intelligent lighting technologies, and in particular, to a method and an apparatus for multi-level dimming of an LED (Light-Emitting Diode) lamp.
Background
As society develops, there is an increasing need to use adjustable circuits. Such as a flashlight, an electric fan and the like, thereby not only having good energy-saving effect, but also meeting the needs of people to the maximum extent. Currently, electrodeless dimming control of an LED portable lamp is generally realized by adjusting LED driving current by adopting PWM (Pulse Width Modulation) duty ratio, when 8-bit binary PWM is used for driving, the maximum dimming level is not more than 256 steps, and the maximum duty ratio cannot be adjusted generally under the limitation of LED rated output current when the current is adjusted by PWM, so that the dimming level is lower than an ideal level in actual use, the dimming is unsmooth, and continuous dimming cannot be realized.
Disclosure of Invention
The invention aims to provide a multistage dimming method and device for an LED lamp, which can increase the dimming stage number of the LED lamp and realize smooth adjustment of the brightness of the LED lamp.
In order to achieve the object of the present invention, the present invention provides a multi-level dimming method for an LED lamp, comprising:
generating a pulse width modulation signal with a first duty ratio and a pulse width modulation signal with a second duty ratio according to a dimming value input by a user;
alternately and circularly outputting the pulse width modulation signal with the first duty ratio and the pulse width modulation signal with the second duty ratio according to a preset time interval to obtain a pulse width modulation signal with a third duty ratio;
and modulating the current of the LED according to the pulse width modulation signal with the third duty ratio.
The preset time interval comprises a first preset time interval and a second preset time interval, the pulse width modulation signal with the first duty ratio is output in the first preset time interval, and the pulse width modulation signal with the second duty ratio is output in the second preset time interval.
Calculating a weight value of the first duty ratio and a weight value of the second duty ratio according to the first preset time interval and the second preset time interval respectively;
and calculating a weighted average value of the first duty ratio and the second duty ratio as the third duty ratio according to the weight value of the first duty ratio and the weight value of the second duty ratio.
Determining a first duty ratio of the pulse width modulation signal according to a dimming value input by a user;
and calculating the sum of the first duty ratio and a preset dimming increment, and determining a second duty ratio of the pulse width modulation signal.
Wherein, the pulse width modulation signal is square wave or triangular wave.
Correspondingly, the invention also provides a multistage dimming device of the LED lamp, which comprises:
the signal generating module is used for generating a pulse width modulation signal with a first duty ratio and a pulse width modulation signal with a second duty ratio according to a dimming value input by a user;
the signal output module is used for alternately and circularly outputting the pulse width modulation signal with the first duty ratio and the pulse width modulation signal with the second duty ratio according to a preset time interval to obtain a pulse width modulation signal with a third duty ratio;
and the signal modulation module is used for modulating the current of the LED according to the pulse width modulation signal with the third duty ratio.
The signal output module is further configured to output the pulse width modulation signal with the first duty ratio in the first preset time interval, and output the pulse width modulation signal with the second duty ratio in the second preset time interval.
Wherein the signal output module is configured to:
respectively calculating a weight value of the first duty ratio and a weight value of the second duty ratio according to the first preset time interval and the second preset time interval;
and calculating a weighted average value of the first duty ratio and the second duty ratio as the third duty ratio according to the weight value of the first duty ratio and the weight value of the second duty ratio.
Wherein the signal generation module comprises:
the first determining unit is used for determining a first duty ratio of the pulse width modulation signal according to a dimming value input by a user;
and the second determining unit is used for calculating the sum of the first duty ratio and a preset dimming increment and determining the second duty ratio of the pulse width modulation signal.
Wherein, the pulse width modulation signal is square wave or triangular wave.
Firstly, generating a pulse width modulation signal with a first duty ratio and a pulse width modulation signal with a second duty ratio according to a dimming value input by a user; then, alternately and circularly outputting the pulse width modulation signal with the first duty ratio and the pulse width modulation signal with the second duty ratio according to a preset time interval to obtain a pulse width modulation signal with a third duty ratio; and finally, modulating the current of the LED according to the pulse width modulation signal with the third duty ratio, thereby increasing the dimming level of the LED lamp and realizing smooth regulation of the brightness of the LED lamp.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a flowchart of a first embodiment of a multi-level dimming method for an LED lamp according to the present invention;
fig. 2 is a flowchart of a second embodiment of a multi-level dimming method for an LED lamp according to the present invention;
fig. 3 is a schematic structural diagram of a multi-level dimming device of an LED lamp according to the present invention;
fig. 4 is a schematic structural diagram of a signal generation module in the apparatus according to the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a flowchart of a first embodiment of a multi-level dimming method for an LED lamp, which may be executed by a single chip, includes:
s101, according to a dimming value input by a user, generating a pulse width modulation signal with a first duty ratio and a pulse width modulation signal with a second duty ratio. The pulse width modulation signal may be a square wave or a triangular wave.
In a specific implementation, a first duty ratio of the pulse width modulation signal may be determined according to a dimming value input by a user; and calculating the sum of the first duty ratio and a preset dimming increment to obtain a second duty ratio of the pulse width modulation signal. 256-level dimming can be realized for the 8-bit binary pulse width modulation signal, the preset dimming increment can be set to be 1, and the dimming level number is increased by one level every time 1 dimming value is increased. For example: when the dimming value input by the user is 200, a pulse width modulation signal with a duty ratio of 200 and a pulse width modulation signal with a duty ratio of 201 may be generated.
And S102, alternately and circularly outputting the pulse width modulation signal with the first duty ratio and the pulse width modulation signal with the second duty ratio according to a preset time interval to obtain a pulse width modulation signal with a third duty ratio. The preset time interval may include a first preset time interval and a second preset time interval.
In a specific implementation, the pwm signal with the first duty ratio is output in the first preset time interval, and the pwm signal with the second duty ratio is output in the second preset time interval. Further, according to the first preset time interval and the second preset time interval, respectively calculating a weight value of the first duty ratio and a weight value of the second duty ratio; and calculating a weighted average value of the first duty ratio and the second duty ratio as the third duty ratio according to the weight value of the first duty ratio and the weight value of the second duty ratio.
For example: the first preset time interval may be 2ms, the second preset time interval may be 1ms, the pwm information with the duty ratio of 200 is output in 0-2ms, the pwm information with the duty ratio of 201 is output in 2ms-3ms, the pwm information with the duty ratio of 200 is output again in 3ms-5ms, and the pwm information with the duty ratio of 201 is output in 5ms-6ms, and the output is performed cyclically and alternately in this way. Then, in a period of several minutes or hours, the output pulse width modulation signal with the third duty ratio is a weighted average of the pulse width modulation signal with the first duty ratio and the pulse width modulation signal with the second duty ratio, wherein if the first preset time interval is T1 and the second preset time interval is T2, the third duty ratio is the first duty ratio (T1/T1+ T2) + the second duty ratio (T2/T1+ T2), and when TI is 2ms and T2 is 1ms, the third duty ratio is 200.33. It should be noted that the first preset time interval is not limited to be set to 2ms, and may also be set to other times; the second preset time interval is not limited to be set to 1ms, and may be set to other times.
And S103, modulating the current of the LED according to the pulse width modulation signal with the third duty ratio.
In specific implementation, 256-level dimming brightness can be realized for 8-bit pulse width modulation signals, and as the third duty ratio is a value inserted in the original two continuous dimming levels, the current modulation of the LED is smoother, and the dimming levels of the LED are increased.
In the embodiment of the invention, firstly, according to a dimming value input by a user, a pulse width modulation signal with a first duty ratio and a pulse width modulation signal with a second duty ratio are generated; then, alternately and circularly outputting the pulse width modulation signal with the first duty ratio and the pulse width modulation signal with the second duty ratio according to a preset time interval to obtain a pulse width modulation signal with a third duty ratio; and finally, modulating the current of the LED according to the pulse width modulation signal with the third duty ratio, thereby increasing the dimming level of the LED lamp and realizing smooth regulation of the brightness of the LED lamp.
Referring to fig. 2, a flowchart of a multi-level dimming method of an LED lamp according to a second embodiment is shown, the method includes:
s201, determining a first duty ratio of the pulse width modulation signal according to a dimming value input by a user. The pulse width modulation signal may be a square wave or a triangular wave.
And S202, calculating the sum of the first duty ratio and a preset dimming increment to obtain a second duty ratio of the pulse width modulation signal. 256-level dimming can be realized for the 8-bit binary pulse width modulation signal, the preset dimming increment can be set to be 1, and the dimming level number is increased by one level every time 1 dimming value is increased. For example: when the dimming value input by the user is 200, a pulse width modulation signal with a duty ratio of 200 and a pulse width modulation signal with a duty ratio of 201 may be generated.
And S203, alternately and circularly outputting the pulse width modulation signal with the first duty ratio and the pulse width modulation signal with the second duty ratio according to a preset time interval to obtain a pulse width modulation signal with a third duty ratio.
In a specific implementation, the pwm signal with the first duty ratio is output in the first preset time interval, and the pwm signal with the second duty ratio is output in the second preset time interval. Further, according to the first preset time interval and the second preset time interval, respectively calculating a weight value of the first duty ratio and a weight value of the second duty ratio; and calculating a weighted average value of the first duty ratio and the second duty ratio as the third duty ratio according to the weight value of the first duty ratio and the weight value of the second duty ratio.
For example: the first preset time interval may be 2ms, the second preset time interval may be 1ms, the pwm information with the duty ratio of 200 is output in 0-2ms, the pwm information with the duty ratio of 201 is output in 2ms-3ms, the pwm information with the duty ratio of 200 is output again in 3ms-5ms, and the pwm information with the duty ratio of 201 is output in 5ms-6ms, and the output is performed cyclically and alternately in this way. Then, in a period of several minutes or hours, the output pulse width modulation signal with the third duty ratio is a weighted average of the pulse width modulation signal with the first duty ratio and the pulse width modulation signal with the second duty ratio, wherein if the first preset time interval is T1 and the second preset time interval is T2, the third duty ratio is the first duty ratio (T1/T1+ T2) + the second duty ratio (T2/T1+ T2), and when TI is 2ms and T2 is 1ms, the third duty ratio is 200.33. It should be noted that the first preset time interval is not limited to be set to 2ms, and may also be set to other times; the second preset time interval is not limited to be set to 1ms, and may be set to other times.
And S204, modulating the current of the LED according to the pulse width modulation signal with the third duty ratio.
In specific implementation, 256-level dimming brightness can be realized for 8-bit pulse width modulation signals, and as the third duty ratio is a value inserted in the original two continuous dimming levels, the current modulation of the LED is smoother, and the dimming levels of the LED are increased.
In the embodiment of the invention, firstly, according to a dimming value input by a user, a pulse width modulation signal with a first duty ratio and a pulse width modulation signal with a second duty ratio are generated; then, alternately and circularly outputting the pulse width modulation signal with the first duty ratio and the pulse width modulation signal with the second duty ratio according to a preset time interval to obtain a pulse width modulation signal with a third duty ratio; and finally, modulating the current of the LED according to the pulse width modulation signal with the third duty ratio, thereby increasing the dimming level of the LED lamp and realizing smooth regulation of the brightness of the LED lamp.
Fig. 3 is a schematic structural diagram of a multi-level dimming device of an LED lamp. The multilevel dimming device in the third embodiment includes:
the signal generating module 301 is configured to generate a pulse width modulation signal with a first duty ratio and a pulse width modulation signal with a second duty ratio according to a dimming value input by a user. The pulse width modulation signal may be a square wave or a triangular wave.
Optionally, as shown in fig. 4, the signal generating module 301 may further include:
and the first determining unit is used for determining the first duty ratio of the pulse width modulation signal according to a dimming value input by a user.
And the second determining unit is used for calculating the sum of the first duty ratio and a preset dimming increment to obtain a second duty ratio of the pulse width modulation signal. 256-level dimming can be realized for the 8-bit binary pulse width modulation signal, the preset dimming increment can be set to be 1, and the dimming level number is increased by one level every time 1 dimming value is increased. For example: when the dimming value input by the user is 200, a pulse width modulation signal with a duty ratio of 200 and a pulse width modulation signal with a duty ratio of 201 may be generated.
A signal output module 302, configured to perform alternate cycle output on the pulse width modulation signal with the first duty ratio and the pulse width modulation signal with the second duty ratio according to a preset time interval to obtain a pulse width modulation signal with a third duty ratio.
In a specific implementation, the pwm signal with the first duty ratio is output in the first preset time interval, and the pwm signal with the second duty ratio is output in the second preset time interval. Further, according to the first preset time interval and the second preset time interval, respectively calculating a weight value of the first duty ratio and a weight value of the second duty ratio; and calculating a weighted average value of the first duty ratio and the second duty ratio as the third duty ratio according to the weight value of the first duty ratio and the weight value of the second duty ratio.
For example: the first preset time interval may be 2ms, the second preset time interval may be 1ms, the pwm information with the duty ratio of 200 is output in 0-2ms, the pwm information with the duty ratio of 201 is output in 2ms-3ms, the pwm information with the duty ratio of 200 is output again in 3ms-5ms, and the pwm information with the duty ratio of 201 is output in 5ms-6ms, and the output is performed cyclically and alternately in this way. Then, in a period of several minutes or hours, the output pulse width modulation signal with the third duty ratio is a weighted average of the pulse width modulation signal with the first duty ratio and the pulse width modulation signal with the second duty ratio, wherein if the first preset time interval is T1 and the second preset time interval is T2, the third duty ratio is the first duty ratio (T1/T1+ T2) + the second duty ratio (T2/T1+ T2), and when TI is 2ms and T2 is 1ms, the third duty ratio is 200.33. It should be noted that the first preset time interval is not limited to be set to 2ms, and may also be set to other times; the second preset time interval is not limited to be set to 1ms, and may be set to other times.
And a signal modulation module 303, configured to modulate the current of the LED according to the pulse width modulation signal with the third duty ratio.
In specific implementation, 256-level dimming brightness can be realized for 8-bit pulse width modulation signals, and as the third duty ratio is a value inserted in the original two continuous dimming levels, the current modulation of the LED is smoother, and the dimming levels of the LED are increased.
In the embodiment of the invention, firstly, according to a dimming value input by a user, a pulse width modulation signal with a first duty ratio and a pulse width modulation signal with a second duty ratio are generated; then, alternately and circularly outputting the pulse width modulation signal with the first duty ratio and the pulse width modulation signal with the second duty ratio according to a preset time interval to obtain a pulse width modulation signal with a third duty ratio; and finally, modulating the current of the LED according to the pulse width modulation signal with the third duty ratio, thereby increasing the dimming level of the LED lamp and realizing smooth regulation of the brightness of the LED lamp.
It should be noted that, for simplicity of description, the above-mentioned embodiments of the method are described as a series of acts or combinations, but those skilled in the art will recognize that the present invention is not limited by the order of acts, as some steps may occur in other orders or concurrently in accordance with the invention. Further, those skilled in the art should also appreciate that the embodiments described in the specification are preferred embodiments and that the acts and modules referred to are not necessarily required by the invention.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by associated hardware instructed by a program, which may be stored in a computer-readable storage medium, and the storage medium may include: flash Memory disks, Read-Only memories (ROMs), Random Access Memories (RAMs), magnetic or optical disks, and the like.
The content downloading method, the related device and the system provided by the present invention are described in detail above, and a specific example is applied in the text to explain the principle and the implementation of the present invention, and the description of the above embodiment is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (6)
1. A multi-level dimming method for an LED lamp, the method comprising:
generating a pulse width modulation signal with a first duty ratio and a pulse width modulation signal with a second duty ratio according to a dimming value input by a user; the method comprises the following steps: determining a first duty ratio of the pulse width modulation signal according to a dimming value input by a user; calculating the sum of the first duty ratio and a preset dimming increment to obtain a second duty ratio of the pulse width modulation signal;
and alternately and circularly outputting the pulse width modulation signal with the first duty ratio and the pulse width modulation signal with the second duty ratio according to a preset time interval, wherein the preset time interval comprises a first preset time interval and a second preset time interval, and the method comprises the following steps of: outputting the pulse width modulation signal with the first duty ratio in the first preset time interval, and outputting the pulse width modulation signal with the second duty ratio in the second preset time interval to obtain a pulse width modulation signal with a third duty ratio;
and modulating the current of the LED according to the pulse width modulation signal with the third duty ratio.
2. The method of claim 1, wherein the weight value of the first duty cycle and the weight value of the second duty cycle are calculated according to the first preset time interval and the second preset time interval, respectively;
and calculating a weighted average value of the first duty ratio and the second duty ratio as the third duty ratio according to the weight value of the first duty ratio and the weight value of the second duty ratio.
3. The method of claim 1, wherein the pulse width modulated signal is a square wave or a triangular wave.
4. A multi-level dimming device for an LED lamp, the device comprising:
the signal generating module is used for generating a pulse width modulation signal with a first duty ratio and a pulse width modulation signal with a second duty ratio according to a dimming value input by a user; the method comprises the following steps: determining a first duty ratio of the pulse width modulation signal according to a dimming value input by a user; calculating the sum of the first duty ratio and a preset dimming increment to obtain a second duty ratio of the pulse width modulation signal;
a signal output module, configured to perform alternate cycle output on the pulse width modulation signal with the first duty ratio and the pulse width modulation signal with the second duty ratio according to a preset time interval, where the preset time interval includes a first preset time interval and a second preset time interval, and includes: outputting the pulse width modulation signal with the first duty ratio in the first preset time interval, and outputting the pulse width modulation signal with the second duty ratio in the second preset time interval to obtain a pulse width modulation signal with a third duty ratio;
and the signal modulation module is used for modulating the current of the LED according to the pulse width modulation signal with the third duty ratio.
5. The apparatus of claim 4, wherein the signal output module is to:
respectively calculating a weight value of the first duty ratio and a weight value of the second duty ratio according to the first preset time interval and the second preset time interval;
and calculating a weighted average value of the first duty ratio and the second duty ratio as the third duty ratio according to the weight value of the first duty ratio and the weight value of the second duty ratio.
6. The apparatus of claim 4, wherein the pulse width modulated signal is a square wave or a triangular wave.
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| CN109378976A (en) * | 2018-10-25 | 2019-02-22 | 广东美的厨房电器制造有限公司 | Power regulation method, apparatus, kitchen appliance and computer readable storage medium |
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| JP2009026544A (en) * | 2007-07-18 | 2009-02-05 | Showa Denko Kk | Light-control device for light-emitting diode and led lighting device |
| CN102316621A (en) * | 2010-06-29 | 2012-01-11 | 英飞特光电（杭州）有限公司 | Method and device for reducing EMI (Electro-Magnetic Interference) of PWM (Pulse-Width Modulation) dimming circuit |
| CN203166760U (en) * | 2011-09-29 | 2013-08-28 | 爱特梅尔公司 | Primary side power factor correction driver circuit with dimming capability |
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| KR101231419B1 (en) * | 2011-03-21 | 2013-02-07 | 호서대학교 산학협력단 | Dimming data generating apparatus for led display system |
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|---|---|---|---|---|
| JP2009026544A (en) * | 2007-07-18 | 2009-02-05 | Showa Denko Kk | Light-control device for light-emitting diode and led lighting device |
| CN102316621A (en) * | 2010-06-29 | 2012-01-11 | 英飞特光电（杭州）有限公司 | Method and device for reducing EMI (Electro-Magnetic Interference) of PWM (Pulse-Width Modulation) dimming circuit |
| CN203166760U (en) * | 2011-09-29 | 2013-08-28 | 爱特梅尔公司 | Primary side power factor correction driver circuit with dimming capability |
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