CN101742766A - LED light dimming method and device - Google Patents
LED light dimming method and device Download PDFInfo
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- CN101742766A CN101742766A CN200810217680A CN200810217680A CN101742766A CN 101742766 A CN101742766 A CN 101742766A CN 200810217680 A CN200810217680 A CN 200810217680A CN 200810217680 A CN200810217680 A CN 200810217680A CN 101742766 A CN101742766 A CN 101742766A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The invention provides LED light dimming method and device suitable for the field of LEDs. The LED light dimming method comprises the following steps of: regulating the duty ratio of a PWM signal according to a light dimming signal input by a user; controlling an LED drive and control unit to switch the frequency of a drive and control signal output by the LED drive and control unit according to the PWM signal; sending a drive switch signal according to the drive and control signal output by the LED drive and control units, and controlling and regulating the luminous flux of an LED unit. In the invention, the duty ratio of the output PWM signal is regulated, the LED drive and control unit is controlled to switch the frequency of the drive and control signal output by the LED drive and control unit, the drive switch signal is sent, and the purpose of controlling and regulating the luminous flux of the LED is realized; and in addition, in the light dimming process of the method, an LED driver is in a working state all the time so that the LED unit bears less impact current, thereby being beneficial to prolonging the service life of the LED and having high applicability.
Description
Technical field
The invention belongs to the LED field, relate in particular to a kind of LED light-dimming method and device.
Background technology
Present many LED use, and as illumination, signal lamp, backlight etc., all need to carry out luminous flux control accurately.
The existing PWM light-dimming method that adopts usually can reach dimming effect preferably, and one of its dimming mode is controlled the purpose that the LED average light is exported for to control the unlatching and the shutoff of led driver with pwm signal thereby reach.Because unlatching and shutoff by Control Driver come light modulation, the operating current of LED frequently switches between the zero-sum rated current, and power supply frequently switches between zero load and nominal load, supply power voltage has very big fluctuation, thereby make LED bear bigger impulse current, cause LED short useful life, applicability is poor.
Summary of the invention
The purpose of the embodiment of the invention is to provide a kind of LED light-dimming method and device, be intended to solve existing by pwm signal control led driver unlatching and during the light-dimming method light modulation of shutoff, the operating current of LED frequently switches between the zero-sum rated current, cause LED short useful life, the problem of applicability difference.
The embodiment of the invention is achieved in that a kind of LED light-dimming method, said method comprising the steps of:
According to the dim signal of user's input, regulate the duty ratio of pwm signal;
Switch the frequency of the drive control signal of its output according to described pwm signal control LED driving control unit;
Drive control signal according to described LED driving control unit output is sent the driving switch signal, the luminous flux of regulating and controlling LED unit.
Another purpose of the embodiment of the invention is to provide a kind of LED light modulating device, comprise a led driver, power supply, LED unit and pwm signal generator, wherein, described led driver further comprises the LED driver element that is connected between described power supply and the LED unit, and the LED driving control unit that links to each other with this LED driver element, described LED driver element is used for sending the driving switch signal according to the drive control signal of described LED driving control unit output, the luminous flux of the described LED of regulating and controlling unit, described pwm signal generator further comprises:
The pwm signal generating unit is used for output pwm signal;
The duty cycle adjustment unit is used for the dim signal according to user's input, regulates the duty ratio of the pwm signal of described pwm signal generating unit output;
Switch control unit is used for controlling the frequency that described LED driving control unit is switched the drive control signal of its output according to the pwm signal of described pwm signal generating unit output.
In the embodiment of the invention, regulate the duty ratio of the pwm signal of output, control LED driving control unit is switched the frequency of the drive control signal of its output, and sends the driving switch signal according to the drive control signal of output, realizes the purpose of the luminous flux of regulating and controlling LED.This method is in the light modulation process, and led driver is in running order all the time, when LED unit light flux hour, it still works under certain average current, thereby the impulse current that makes the LED unit bear is less, helps the LED prolongation in useful life, and applicability is strong.
Description of drawings
Fig. 1 is the flow chart of the LED light-dimming method that provides of the embodiment of the invention;
Fig. 2 is the oscillogram of the first embodiment of the invention pwm signal, LED drive control signal, LED driving switch signal and the LED cell operation electric current that provide;
Fig. 3 is the oscillogram of the second embodiment of the invention pwm signal, LED drive control signal, LED driving switch signal and the LED cell operation electric current that provide;
Fig. 4 is the principle assumption diagram of the LED light modulating device that provides of the embodiment of the invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
In the embodiment of the invention, regulate the duty ratio of the pwm signal of output, control LED driving control unit is switched the frequency of the drive control signal of its output, and sends the driving switch signal according to the drive control signal of output, realizes the purpose of the luminous flux of regulating and controlling LED.
Fig. 1 shows the flow process of the LED light-dimming method that the embodiment of the invention provides.
In step S101,, regulate the duty ratio of pwm signal according to the dim signal of user's input.
Wherein, the duty ratio of pwm signal can be regulated arbitrarily between certain limit.When carrying out light modulation by pwm signal, if the frequency of pwm signal drops in the scope of 200Hz～20KHz, then the device around the led driver can produce the audible noise of people's ear, if the frequency of pwm signal is below 50Hz, then human eye can be felt the flicker of light source, therefore, for obtain to stablize, continuous light source, avoiding simultaneously can audible generating noise, and in embodiments of the present invention, the frequency of pwm signal is between the 50Hz to 200Hz or more than the 20KHz.
In step S102, switch the frequency of the drive control signal of its output according to pwm signal control LED driving control unit.
In first embodiment of the invention, switch the frequency of the drive control signal of its output according to pwm signal control LED driving control unit, the frequency of the drive control signal when making the frequency of the drive control signal when pwm signal is high level be higher than pwm signal to be low level.
In second embodiment of the invention, switch the frequency of the drive control signal of its output according to pwm signal control LED driving control unit, the frequency of the drive control signal when making the frequency of the drive control signal when pwm signal is high level be lower than pwm signal to be low level.
In step S103, send the driving switch signal, the luminous flux of regulating and controlling LED unit according to the drive control signal of LED driving control unit output.Wherein, the LED unit can be single led, also can be serial or parallel connection and other the various composite modules of a plurality of LED, as LED street lamp, signal lamp and backlight of LCD etc.
In first embodiment of the invention, please, for convenience of explanation, be modulated to example when being in high level with pwm signal referring to Fig. 2, those skilled in the art will appreciate that the method for modulating when the method for modulating is in high level with pwm signal is identical when pwm signal is in low level.
When pwm signal is in the low level sustained period (is V
PWMBe in T
OffIn time period) or LED driving control unit when not adopting pwm signal to modulate, the LED driving control unit is exported it and is in the drive control signal (V of Fig. 2 under the normal operating conditions
DrainIn the waveform with T
OffThe part of time correspondence), at this moment, the LED driver element is exported the driving switch signal (I of Fig. 2 according to this drive control signal of LED driving control unit output
ChokeIn the waveform with T
OffThe part of time correspondence), the LED unit works in the state of the mean value of operating current in the one-period for maximum, the I of its operating current such as Fig. 2 according to this driving switch signal
LedIn the waveform with T
OffThe part of time correspondence, wherein, dotted line a represents T
OffThe peak value of LED cell operation electric current in cycle, dotted line b represents T
OffThe load current value of LED cell operation electric current in cycle, c represent to be modulated back T
OffThe mean value of LED cell operation electric current in cycle.
When pwm signal is in the high level sustained period (is V
PWMBe in T
OnIn time period), when the drive control signal after the output of LED driving control unit is switched, its frequency are higher than pwm signal and are low level, the frequency (V of Fig. 2 of the drive control signal of LED driver element output
DrainIn the waveform with T
OnThe part of time correspondence), at this moment, the LED driver element is exported the driving switch signal (I of Fig. 2 according to this drive control signal of LED driving control unit output
ChokeIn the waveform with T
OnThe part of time correspondence), the LED unit works in the state of the mean value of operating current in the one-period for minimum, the I of its operating current such as Fig. 2 according to this driving switch signal
LedIn the waveform with T
OnThe part of time correspondence, wherein, dotted line d represents to be modulated back T
OnThe mean value of LED cell operation electric current in cycle.In cycle, the average current value of LED cell operation electric current is for being modulated back T at a pwm signal
OffThe mean value and the T of LED cell operation electric current in cycle
OnThe mean value of the mean value of LED cell operation electric current in cycle.
In embodiments of the present invention, when the dim signal according to user's input, the duty ratio of regulating the pwm signal of output is T
On/ T=0%, the mean value of default driving switch signal is the load current value of LED cell operation electric current, at this moment, the LED unit has best luminous flux, the power output maximum of LED driver element; When the dim signal according to user's input, the duty ratio of regulating pwm signal is T
On/ T=100%, the power output minimum of LED driver element, LED unit light flux minimum, but still work under certain average current, thereby the impulse current that makes the LED unit bear is less, helps the LED prolongation in useful life.The duty ratio of pwm signal can be regulated arbitrarily according to user's needs between 0%～100%, with the adjusting of realization to the luminous flux of LED unit, and T
OffDuration is long more, and LED unit light flux is strong more.Certainly, when specific implementation, can in the duty ratio of pwm signal T also
OnWhen/T was other arbitrary value, the mean value of default driving switch signal was the load current value of LED cell operation electric current, made the duty ratio of pwm signal between other scope, according to user's adjusting, realized the adjusting to the luminous flux of LED unit.
In addition, in embodiments of the present invention, in order to improve the usefulness of system, driving switch signal I
ChokeBe one-period zero current cross signal, certainly, when specific implementation, also can adopt the not current signal of zero passage.
Fig. 3 shows the oscillogram of pwm signal, LED drive control signal, LED driving switch signal and LED cell operation electric current that second embodiment of the invention provides.With shown in Figure 2 different, in embodiments of the present invention, (be V when pwm signal is in the high level sustained period
PWMBe in T
OnIn time period), when the drive control signal after the output of LED driving control unit is switched, its frequency are lower than pwm signal and are high level, the frequency (V of Fig. 3 of the drive control signal of LED driver element output
DrainIn the waveform with T
OnThe part of time correspondence), at this moment, the LED unit is according to the driving switch signal (I of Fig. 3
ChokeIn the waveform with T
OnThe part of time correspondence) mean value that works in operating current in the one-period (is V for maximum state when pwm signal is in the low level sustained period
PWMBe in T
OffIn time period), the LED unit is according to the driving switch signal (I of Fig. 3
ChokeIn the waveform with T
OffThe part of time correspondence), the LED unit works in the state of the mean value of operating current in the one-period for minimum according to this driving switch signal.That is to say that in one-period, the adjustment process of the embodiment of the invention is opposite with the adjustment process that first embodiment of the invention provides, the embodiment of the invention is at T
OffT in the adjustment process that adjustment process in cycle and first embodiment of the invention provide
OnAdjustment process in cycle is identical, and the embodiment of the invention is at T
OnT in the adjustment process that adjustment process in cycle and first embodiment of the invention provide
OffAdjustment process in cycle is identical.
In embodiments of the present invention, when the dim signal according to user's input, the duty ratio of regulating the pwm signal of output is T
On/ T=100%, the mean value of default driving switch signal is the load current value of LED cell operation electric current, at this moment, the LED unit has best luminous flux, the power output maximum of LED driver element; When the dim signal according to user's input, the duty ratio of regulating pwm signal is T
On/ T=0%, the power output minimum of LED driver element, LED unit light flux minimum.The duty ratio of pwm signal can be regulated arbitrarily according to user's needs between 0%～100% equally, and T
OnDuration is long more, and LED unit light flux is strong more.Similarly, when specific implementation, can in the duty ratio of pwm signal T also
OnWhen/T was other arbitrary value, the mean value of default driving switch signal was the load current value of LED cell operation electric current, made the duty ratio of pwm signal between other scope, according to user's adjusting, realized the adjusting to the luminous flux of LED unit.Similarly, I
ChokeFor one-period zero current cross signal, when specific implementation, also can adopt the not current signal of zero passage.
In addition, because luminous flux and temperature are inversely proportional to, variation of temperature has certain influence to LED unit wavelength, therefore, among the first embodiment of the invention and second embodiment, before or after step S103, can further include following steps: obtain LED unit heating temp, and send feedback signal; According to feedback signal, by regulating the duty ratio of pwm signal, regulate the luminous flux of LED unit, thereby stablize the luminous flux output of LED unit.
Fig. 4 shows the theory structure of the LED light modulating device that the embodiment of the invention provides, and for convenience of explanation, only shows the part relevant with the embodiment of the invention.
Duty cycle adjustment unit 141 in the pwm signal generator 14 receives the dim signal of user's input, and according to this dim signal, regulate the duty ratio of the pwm signal of pwm signal generating unit 142 outputs in the pwm signal generator 14, switch control unit 143 in the pwm signal generator 14 is according to the pwm signal of pwm signal generating unit 142 outputs, and the LED driving control unit 122 in the control led driver 12 is switched the frequency of the drive control signal of its output.
Wherein, for the ease of the operating frequency of led driver 12 is modulated, so that it is easy to realize the zero current of switching device, led driver 12 employings one work in the high frequency switch-mode converter of variable mode, be suitable for use as the converter of the topology of controlled constant-current source as BUCK, BOOST, FLYBACK or other, and its operating frequency can be modulated with pwm signal, thereby has improved its usefulness.
In first embodiment of the invention, switch control unit 143 is according to the pwm signal of pwm signal generating unit 142 outputs, control LED driving control unit 122 is switched the frequency of the drive control signal of its outputs, the frequency of the drive control signal when making the frequency of the drive control signal when pwm signal is high level be higher than pwm signal to be low level.
In second embodiment of the invention, switch control unit 143 is according to the pwm signal of pwm signal generation unit 142 outputs, control LED driving control unit 122 is switched the frequency of the drive control signal of its outputs, the frequency of the drive control signal when making the frequency of the drive control signal when pwm signal is high level be lower than pwm signal to be low level.
In the LED light modulating device that first embodiment of the invention and second embodiment are provided, also further comprise temperature sensor 15, be used to obtain LED unit 13 heating temps, and send and feed back signal to duty cycle adjustment unit 141, duty cycle adjustment unit 141 is according to its feedback signal that receives, the duty ratio of the pwm signal by regulating 142 outputs of pwm signal generating unit regulate the luminous flux of LED unit 13, thereby the luminous flux of stablize LED unit 13 is exported.Wherein, temperature sensor 15 can also place pwm signal generator 14.
In the embodiment of the invention, regulate the duty ratio of the pwm signal of output, control LED driving control unit is switched the frequency of the drive control signal of its output, and sends the driving switch signal according to the drive control signal of output, realizes the purpose of the luminous flux of regulating and controlling LED.This method is in the light modulation process, and led driver is in running order all the time, when LED unit light flux hour, it still works under certain average current, thereby the impulse current that makes the LED unit bear is less, helps the LED prolongation in useful life, and applicability is strong.In addition, this light-dimming method can also obtain its heating temp in the LED cell operation therebetween, sends feedback signal, and according to this feedback signal, by regulating the duty ratio of pwm signal, regulates the luminous flux of LED unit, thereby has stablized the luminous flux output of LED unit.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a LED light-dimming method is characterized in that, said method comprising the steps of:
According to the dim signal of user's input, regulate the duty ratio of pwm signal;
Switch the frequency of the drive control signal of its output according to described pwm signal control LED driving control unit;
Drive control signal according to described LED driving control unit output is sent the driving switch signal, the luminous flux of regulating and controlling LED unit.
2. LED light-dimming method as claimed in claim 1 is characterized in that, the step of the frequency of the described drive control signal of switching its output according to described pwm signal control LED driving control unit is specially:
Switch the frequency of the drive control signal of its output according to described pwm signal control LED driving control unit, make the frequency of the drive control signal when described pwm signal is high level be higher or lower than the frequency of the drive control signal of described pwm signal when being low level.
3. LED light-dimming method as claimed in claim 1, it is characterized in that, send the driving switch signal in described drive control signal, further may further comprise the steps before or after the step of the luminous flux of regulating and controlling LED unit according to described LED driving control unit output:
Obtain LED unit heating temp, and send feedback signal;
According to described feedback signal,, regulate the luminous flux of LED unit by regulating the duty ratio of pwm signal.
4. as each described LED light-dimming method of claim 1 to 3, it is characterized in that described LED driver element is a controlled constant-current source.
5. as each described LED light-dimming method of claim 1 to 3, it is characterized in that the frequency of described pwm signal is between the 50Hz to 200Hz or more than the 20KHz.
6. LED light modulating device, comprise a led driver, power supply, LED unit and pwm signal generator, wherein, described led driver further comprises the LED driver element that is connected between described power supply and the LED unit, and the LED driving control unit that links to each other with this LED driver element, it is characterized in that, described LED driver element is used for sending the driving switch signal according to the drive control signal of described LED driving control unit output, the luminous flux of the described LED of regulating and controlling unit, described pwm signal generator further comprises:
The pwm signal generating unit is used for output pwm signal;
The duty cycle adjustment unit is used for the dim signal according to user's input, regulates the duty ratio of the pwm signal of described pwm signal generating unit output;
Switch control unit is used for controlling the frequency that described LED driving control unit is switched the drive control signal of its output according to the pwm signal of described pwm signal generating unit output.
7. LED light modulating device as claimed in claim 6, it is characterized in that, described switch control unit specifically is to be used for controlling the frequency that described LED driving control unit is switched the drive control signal of its output according to the pwm signal of described pwm signal generating unit output, makes the frequency of the drive control signal when the pwm signal of described pwm signal generation unit output is high level be higher or lower than the frequency of the drive control signal of described pwm signal when being low level.
8. LED light modulating device as claimed in claim 6 is characterized in that, described device further comprises:
Temperature sensor is used to obtain LED unit heating temp, and sends feedback signal;
Described duty cycle adjustment unit also is used for the feedback signal sent according to described temperature sensor, and the duty ratio of the pwm signal by regulating described pwm signal generating unit output is regulated the luminous flux of described LED unit.
9. as claim 6,7 or 8 described LED light modulating devices, it is characterized in that described LED driver element is a controlled constant-current source.
10. as claim 6,7 or 8 described LED light modulating devices, it is characterized in that described led driver adopts the high frequency switch-mode converter that works in variable mode.
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| CN200810217680A CN101742766A (en) | 2008-11-20 | 2008-11-20 | LED light dimming method and device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810217680A CN101742766A (en) | 2008-11-20 | 2008-11-20 | LED light dimming method and device |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102123548A (en) * | 2010-12-30 | 2011-07-13 | 深圳市京泉华电子有限公司 | Brightness adjusting method and system of LED lamp |
| CN102131333A (en) * | 2011-04-28 | 2011-07-20 | 浙江晶日照明科技有限公司 | Dimming method of light emitting diode (LED) |
| CN102158083A (en) * | 2011-04-22 | 2011-08-17 | 复旦大学 | BUCK converter for stabilizing output light flux of LED (light-emitting diode) |
| WO2012055283A1 (en) * | 2010-10-28 | 2012-05-03 | 英飞特电子（杭州）有限公司 | Method, apparatus and system for controlling light source |
| CN102455577A (en) * | 2010-10-20 | 2012-05-16 | 精工爱普生株式会社 | Light source control device, projector, and light source control method |
| CN102625527A (en) * | 2012-03-07 | 2012-08-01 | 深圳世强电讯有限公司 | LED (Light Emitting Diode) dimming device, system and method |
| CN102811525A (en) * | 2011-05-31 | 2012-12-05 | 海洋王照明科技股份有限公司 | LED lamp and control circuit thereof |
| CN103052232A (en) * | 2012-12-24 | 2013-04-17 | 常州星宇车灯股份有限公司 | Automatic adjusting method for LED (Light Emitting Diode) luminous flux |
| CN103687212A (en) * | 2013-11-29 | 2014-03-26 | 青岛威力电子科技有限公司 | High-brightness LED lamp and control circuit |
| CN104113966A (en) * | 2014-06-13 | 2014-10-22 | 佛山市南海赛威科技技术有限公司 | Constant current source system for average current mode control, and control method thereof |
| WO2016065528A1 (en) * | 2014-10-28 | 2016-05-06 | Texas Instruments Incorporated | Dual control led driver |
| CN110389306A (en) * | 2018-04-16 | 2019-10-29 | 纬创资通股份有限公司 | Arrangement for detecting and method for detecting |
| CN112087844A (en) * | 2020-08-21 | 2020-12-15 | 蜂联智能（深圳）有限公司 | Dimming processing method, dimming driving device and light source component |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102455577B (en) * | 2010-10-20 | 2016-02-03 | 精工爱普生株式会社 | Light source control device and method and projector |
| CN102455577A (en) * | 2010-10-20 | 2012-05-16 | 精工爱普生株式会社 | Light source control device, projector, and light source control method |
| WO2012055283A1 (en) * | 2010-10-28 | 2012-05-03 | 英飞特电子（杭州）有限公司 | Method, apparatus and system for controlling light source |
| CN102123548B (en) * | 2010-12-30 | 2014-04-09 | 深圳市京泉华科技股份有限公司 | Brightness adjusting method and system of LED lamp |
| CN102123548A (en) * | 2010-12-30 | 2011-07-13 | 深圳市京泉华电子有限公司 | Brightness adjusting method and system of LED lamp |
| CN102158083B (en) * | 2011-04-22 | 2013-05-01 | 复旦大学 | BUCK converter for stabilizing output light flux of LED (light-emitting diode) |
| CN102158083A (en) * | 2011-04-22 | 2011-08-17 | 复旦大学 | BUCK converter for stabilizing output light flux of LED (light-emitting diode) |
| CN102131333B (en) * | 2011-04-28 | 2013-08-28 | 浙江晶日照明科技有限公司 | Dimming method of light emitting diode (LED) |
| CN102131333A (en) * | 2011-04-28 | 2011-07-20 | 浙江晶日照明科技有限公司 | Dimming method of light emitting diode (LED) |
| CN102811525A (en) * | 2011-05-31 | 2012-12-05 | 海洋王照明科技股份有限公司 | LED lamp and control circuit thereof |
| CN102625527B (en) * | 2012-03-07 | 2015-02-11 | 深圳市世强先进科技有限公司 | LED (Light Emitting Diode) dimming device, system and method |
| CN102625527A (en) * | 2012-03-07 | 2012-08-01 | 深圳世强电讯有限公司 | LED (Light Emitting Diode) dimming device, system and method |
| CN103052232A (en) * | 2012-12-24 | 2013-04-17 | 常州星宇车灯股份有限公司 | Automatic adjusting method for LED (Light Emitting Diode) luminous flux |
| CN103687212A (en) * | 2013-11-29 | 2014-03-26 | 青岛威力电子科技有限公司 | High-brightness LED lamp and control circuit |
| CN104113966A (en) * | 2014-06-13 | 2014-10-22 | 佛山市南海赛威科技技术有限公司 | Constant current source system for average current mode control, and control method thereof |
| WO2016065528A1 (en) * | 2014-10-28 | 2016-05-06 | Texas Instruments Incorporated | Dual control led driver |
| CN110389306A (en) * | 2018-04-16 | 2019-10-29 | 纬创资通股份有限公司 | Arrangement for detecting and method for detecting |
| CN110389306B (en) * | 2018-04-16 | 2022-05-24 | 纬创资通股份有限公司 | Detection device and detection method |
| CN112087844A (en) * | 2020-08-21 | 2020-12-15 | 蜂联智能（深圳）有限公司 | Dimming processing method, dimming driving device and light source component |
| CN112087844B (en) * | 2020-08-21 | 2023-05-23 | 蜂联智能（深圳）有限公司 | Dimming processing method, dimming driving device and light source component |
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Application publication date: 20100616 |