CN109526091A - Dimming control system - Google Patents
Dimming control system Download PDFInfo
- Publication number
- CN109526091A CN109526091A CN201710861269.2A CN201710861269A CN109526091A CN 109526091 A CN109526091 A CN 109526091A CN 201710861269 A CN201710861269 A CN 201710861269A CN 109526091 A CN109526091 A CN 109526091A
- Authority
- CN
- China
- Prior art keywords
- signal
- module
- light
- voltage
- light modulation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
Landscapes
- Discharge-Lamp Control Circuits And Pulse- Feed Circuits (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention discloses a kind of dimming control systems, the light emission luminance signal for obtaining illuminator including the sampling module that shines is transferred to integrator module, integrator module integrates the sample signal that light emission luminance signal generates direct current kenel, error amplifier block receives sample signal and external light modulation reference voltage generates output offset voltage signal, whether the output signal of comparator module error in judgement amplifier reaches the critical point of conversion, select the offset voltage or critical point voltage of the output of output error amplifier, as a control reference signal, the periodical continuous wave input signal for controlling reference signal and limited peak value inputs light-adjusting module, light-adjusting module generates light modulation signal and is transferred to power conversion module, power conversion module will control reference signal and dim the cycle synchronisation of signal, dimming control system is enabled to control under middle high brightness in illuminator Simulation light modulation enters the digital dimming of fixed frequency in low-light level, and intermediate conversion does not generate the gap drop of conversion.
Description
Technical field
The present invention relates to a kind of dimming control systems, particularly relate to a kind of turn between simulation light modulation and digital dimming
It changes, the dimming control system of a flicker free control mode is provided.
Background technique
The mode of light modulation can be divided into simulation light modulation and digital dimming, simulate light modulation mode directly use stable voltage or
Electric current adjusts light emission luminance, and the output brightness of visual illuminator is according to voltage or current-mode, the electricity of adjustment controller output
Pressure or electric current；Digital dimming is under changeless voltage or electric current, with the side of PWM (Pulse Width Modulation)
The time scale that formula goes cutting luminous, brightness is that fluorescent lifetime is directly proportional with the ratio of shut-in time.Also there is integrated light modulation
Control mode, in high brightness to simulation brightness adjustment control is used between middle brightness, in middle low-light level digital dimming mode used below.
Because simulation light modulation relies on the signal that shines as feedback, in low-light level, feedback signal is too low to will affect control
Stability is with precision, and one to being not easy to control；Very and, simulation light modulation can generate different colour temperatures under height luminance, for making
For the application that color requirements are stringent, it is not appropriate under low luminance using simulation light modulation.And digital dimming also have the shortcomings that it is potential,
If will cause human ear abnormal sound in audio range including light modulating frequency, if light modulating frequency is too low, human eye can be appreciated that illuminator
Flashing.And digital dimming also be easy to cause power line to generate multiple harmonic and distortion, is unfavorable for PFC (Power Factor
Correction) specification requirement being increasingly stringenter is required with THD (Total Harmonic Distortion).So integration
Dimming mode at mixed type is that its advantage solution is respectively taken in the two, certainly it is certain control routes frameworks also because
Its gain curve can not obtain balance between low-light level control and efficiency, and this control route can be forced into prominent in low-light level
Hair mode (burst mode), but the frequency of such burst mode be it is uncontrollable, because the lower and lower frequency of its brightness is also got over
It is next defeated low, it is also inevitable into the visible flashing rate of human eye.
Therefore, dealer just develops the similar technology for combining digital dimming and simulation light modulation, as TaiWan, China invention is special
Sharp bulletin, notification number I 501006 " back light unit and its driving method " a, it is characterised in that: back light unit includes: one
LED array is with a plurality of LED；One voltage generating unit is used to generate a driving voltage to respond switching signal drive
Move these LED；One amplifying unit is for feeding back driving voltage and amplifying the driving voltage of feedback to export an amplification signal；
One stabilizer is used to stablize amplification signal；One comparator is for comparing amplification signal and a reference waveform to apply switching
Signal is to voltage generating unit；One first switch unit is used to respond and cut from one of timing controller PWM light modulation signal
Change one of LED array electric current；And one second switch unit, it is to switch cutting from comparator for responding PWM light modulation signal
Change signal；So, in this patent, for the technical of PWM light modulation, and the deficiency of starting transient voltage can not be reduced, led
Cause bigger error when PWM light modulation movement.
TaiWan, China new patent bulletin, notification number the M359771st " double dimming backlight source drive devices ", feature exists
In: a kind of double dimming backlight source drive devices receive a Pulse Width Modulation dim signal and carry out digital dimming, the light modulation of this Pulse Width Modulation
Signal within a period include an enable during and a forbidden energy during, and its responsibility cycle be an enable during and a period ratio
Value.Input direct-current voltage is converted into output AC voltage during enable to drive backlight to make it by this creation driving device
It is bright, and do not drive backlight to keep it dark during forbidden energy；In addition, when responsibility cycle is greater than critical responsibility cycle, in the enable phase
Between so that lamp current size is fixed as the first current value according to the difference of feedback voltage and the first voltage value, and detecting duty
When the period being appointed to be less than or equal to critical responsibility cycle, the first voltage value is adjusted to second voltage value, according to anti-during enable
The difference of feedthrough voltage and second voltage value makes lamp current size be fixed as the second current value, and the second current value is less than the first electricity
Flow valuve.Therefore, this creation is less than or equal to critical responsibility cycle, i.e. average brightness in responsibility cycle based on digital dimming
After certain degree, lamp current size further is reduced to simulate dimming mode, average brightness is made to further decrease and improve
Brightness contrast value；This right patent, on-t ime (actuation time) of the control of backlight in low-light level because of PWM is too short,
For shine the opening time be restricted, cause to lead to the problem of when low-light level it is nonlinear, although and this patent have number
Word is dimmed to be dimmed with simulation, but without solving the problem of that the two light-modulating mode generates step variation in switching.
And Chinese patent publication, a kind of " the Digital Simulation light modulation electricity of ports share of notification number the CN106535412Ath
Road ", it is characterised in that: the invention discloses a kind of Digital Simulation light adjusting circuits of ports share, including comparator module, buffering
Device module, gate logic module；Wherein, comparator module includes the first, second comparator A1 and A2, first comparator A1 processing
Digital dimming and the enable end EN working condition that the second comparator A2 is controlled by buffer module B1, B2 and capacitor C, the second ratio
Compared with device A2 processing simulation light modulation, through two comparators treated dim signal passes through again gate logic module or door or and with door
And output, beneficial effects of the present invention be to incorporate emulation light modulation and the input interface of digital dimming so that an input terminal
Mouth has the function of emulation and digital dimming simultaneously, while structure is simple, saves chip area and packaging cost；This right piece
Patent only has number and simulation both of which in the mode of input light modulation signal, but the control signal actually exported is still tieed up
Hold single digital PWM mode.
In view of disadvantages mentioned above has been commonly used, inventor is the road for aforesaid drawbacks Improvement, there is production of the present invention finally
It is raw.
Summary of the invention
Present invention is primarily aimed at provide a kind of light modulation simulated and will not generate flashing when light modulation is converted with digital dimming
Control system.
Secondary objective of the present invention is, provide it is a kind of with the same offset voltage in the quasi- light modulation of middle high brightness time control molding,
Enter the dimming control system of the digital dimming of fixed frequency in low-light level.
Still a further object of the present invention is, provides a kind of periodical continuous wave input signal for importing limited peak value, and make to adjust
The dimming control system of light signal property synchronizing cycle continuous wave input signal.
To reach above-mentioned purpose and effect, technological means practiced by the present invention includes:
One luminous sampling module, for the light emission luminance signal for obtaining an illuminator；
One integrator module is electrically connected with aforementioned luminous sampling module, is received and will be after light emission luminance signal integral
Generate the sample signal of an once-through type state；
One error amplifier block has and is electrically connected with aforementioned integrator module, receives sample signal and outside
The light modulation reference voltage provided, generates an output signal；
Whether one comparator module, the output signal of error in judgement transformer reach the critical point of conversion, and selection output misses
The offset voltage or critical point voltage of poor amplifier output, as a control reference signal；
One light-adjusting module, the periodical continuous wave input signal of one limited peak value of reception and aforementioned control reference signal,
Generate a light modulation signal；And
One power conversion module is electrically connected with aforementioned comparator module, light-adjusting module respectively, and power conversion module will
It controls reference signal and dims the cycle synchronisation of signal to export brightness of the dimming control signal to adjust illuminator；
Whereby, the control reference signal of aforementioned comparator module output tool offset voltage, control reference signal and limited peak
The periodical continuous wave input signal of value inputs light-adjusting module, and light-adjusting module generates light modulation signal and is transferred to power conversion module,
Power conversion module will control reference signal and dim the cycle synchronisation of signal, and dimming control system is enabled to highlight in illuminator
The lower control simulation light modulation of degree, the digital dimming of fixed frequency is entered in low-light level, and intermediate conversion does not generate conversion
Gap drop.
To reach above-mentioned purpose and effect, technological means practiced by the present invention includes:
According to above structure, the comparator module is positive feedback control, then power conversion module will control reference signal pincers
Position is in the positive peak for dimming signal, and the positive peak for dimming signal is the peak voltage of periodical continuous wave input signal.
According to above structure, the comparator module is negative feedback control, then power conversion module will control reference signal pincers
Position is in the negative peak for dimming signal, and the negative peak for dimming signal is the peak voltage of periodical continuous wave input signal.
According to above structure, the periodical continuous wave input signal is the sawtooth wave or triangular wave of cycle stability, and described
Limited peak value be offset voltage voltage range in.
According to above structure, it is electrically connected one jointly between the error amplifier block, comparator module and light-adjusting module
Compensating electric capacity, the compensating electric capacity generate offset voltage.
According to above structure, the light-adjusting module connects a decoupling capacitor, and the voltage on decoupling capacitor is aforementioned limited peak
The periodical continuous wave input signal of value.
More specifically understand to can get above-mentioned purpose of the invention, effect and feature, as follows according to each Detailed description of the invention:
Detailed description of the invention
Fig. 1 is the block diagram of present pre-ferred embodiments.
Fig. 2 is the block diagram of another preferred embodiment of the invention.
Fig. 3 is the movement oscillogram of Fig. 2.
Fig. 4 is the block diagram of another embodiment of the present invention.
Fig. 5 is the movement oscillogram of Fig. 4.
Specific embodiment
Refering to Figure 1, being the block diagram of present pre-ferred embodiments, it is known that system of the invention specifically includes that
One luminous sampling module 2, for the light emission luminance signal for obtaining an illuminator 1.
One integrator module 3 is electrically connected with aforementioned luminous sampling module 2, receives and integrate light emission luminance signal
The sample signal of an once-through type state is generated afterwards.
One error amplifier block 4 is electrically connected with aforementioned integrator module 3, is received sample signal and is mentioned with outside
The light modulation reference voltage supplied, generates an output signal.
One comparator module 5, with aforementioned error amplifier block 4 be electrically connected, error in judgement amplifier module 4 it is defeated
Whether signal reaches the critical point of conversion out, output error amplifier output offset voltage or critical point voltage is selected, as one
Control reference signal.
One light-adjusting module 6, the periodical continuous wave input signal of one limited peak value of reception and aforementioned control reference signal,
A light modulation signal is generated, and, light-adjusting module 6 connects a decoupling capacitor 9, and the voltage on decoupling capacitor 9 is aforementioned limited peak
The periodical continuous wave input signal of value, it is noted that the periodical continuous wave input signal is the sawtooth of cycle stability
Wave, triangular wave or string wave, and " limited peak value " is in the voltage range of aforementioned backoff voltage.
One power conversion module 7 is electrically connected with aforementioned comparator module 5, light-adjusting module 6, power supply modulus of conversion respectively
Block 7 will control reference signal and dim the cycle synchronisation of signal to export a dimming control signal to adjust the bright of illuminator
Degree.
And aforementioned backoff voltage, it is from a compensating electric capacity 8, the compensating electric capacity 8 is error amplifier block 4, ratio
It is electrically connected jointly compared between device module 5 and light-adjusting module 6.
Whereby, the control reference signal of the aforementioned output of comparator module 5 tool offset voltage, control reference signal and limited peak
The periodical continuous wave input signal of value inputs light-adjusting module 6, and light-adjusting module 6 generates light modulation signal and is transferred to power conversion module
7, power conversion module 7 will control reference signal and dim the cycle synchronisation of signal, enable dimming control system in illuminator 1 in
Control simulation light modulation under high brightness enters the digital dimming of fixed frequency in low-light level, and intermediate conversion does not generate and turns
The gap drop changed.
It please refers to shown in Fig. 2, Fig. 4, is the block diagram and movement oscillogram of another preferred embodiment of the invention, the present embodiment
Indicate that, comparator module 5 of the invention positive feedback state sample implementation, it can be seen in the drawing that the benefit in compensating electric capacity 8
Repay that voltage (VEA) is lower, i.e. the output signal voltage of error amplifier block 4 is lower, represents the output work of power conversion module 7
Rate is lower, when offset voltage (VEA) is as low as the wave crest (VP) of the periodical continuous wave input signal (Vc) closed on decoupling capacitor 9
When, power conversion module 7 will control reference signal clamp in periodical continuous wave input signal (Vc) and offset voltage (VEA) the
The negative peak of one contact point, i.e. trough (VV), but external input voltage still will change with light modulation reference voltage, when outer
The input voltage in portion is higher than the trough (VV) of periodical continuous wave input signal, lower than the wave crest of periodical continuous wave input signal
(VP) when between, the digital dimming signal T2 of a PWM control signal kenel can be generated.Power conversion module 7 will control at this time
The cycle synchronisation of reference signal and light modulation signal, the i.e. output of power conversion module 7 are reformed into as PWM controls what signal synchronized
ON/OFF alternate control mode.And power conversion module 7 is in the section of ON, used control signal is trough (VV).
Therefore, before offset voltage (VEA) is not contacted with periodical continuous wave input signal (Vc) also, power-switching circuit
The brightness adjustment control signal T of 7 outputs is the simulation light modulation signal T1 for simulating kenel, is simulation brightness adjustment control under this stage
State；When offset voltage (VEA) is not contacted with periodical continuous wave input signal (Vc) also, brightness adjustment control signal T's
Voltage cutting edge of a knife or a sword value can be clamped at the trough (VV) of periodical continuous wave input signal (Vc)；The voltage peak of brightness adjustment control signal T
After fixation, the brightness adjustment control signal T period can be because of 7 synchronously control reference signal of power conversion module and the week for dimming signal
Phase generates the digital dimming signal T2 of PWM control signal kenel, is the state of digital dimming control under this stage, and
More it is clear that being not directly to turn during simulation light modulation signal T1 is converted to digital dimming signal T2 in Fig. 3
It carries out simulation and reports the movement of position, but gradual conversion, and can achieve will not when simulation light modulation is converted with digital dimming
Generate the dimming control system of flashing.
In summary, dimming control system of the invention is reached really using the same offset voltage in middle high brightness
The quasi- light modulation of time control molding, the digital dimming of fixed frequency is entered in low-light level, and intermediate conversion process does not generate flashing
(the gap drop of conversion).Actually patent of invention is filed an application in a novel and progressive invention of tool, whence in accordance with the law；It is stated on only
Bright content, only presently preferred embodiments of the present invention explanation, technological means under this invention and scope are extended such as variation,
Modification, change or equivalent replacement person, should all fall within the claims of the present invention.
Claims (8)
1. a kind of dimming control system characterized by comprising
One luminous sampling module, for the light emission luminance signal for obtaining an illuminator；
One integrator module is electrically connected with aforementioned luminous sampling module, is received and will be generated after light emission luminance signal integral
The sample signal of one once-through type state；
One error amplifier block has and is electrically connected with aforementioned integrator module, receives sample signal and outside provides
One light modulation reference voltage, generate an output signal；
One comparator module is electrically connected, the output signal of error in judgement amplifier module with aforementioned error amplifier block
Whether reach the critical point of conversion, selects output error amplifier output offset voltage or critical point voltage；
One light-adjusting module, the periodical continuous wave input signal of one limited peak value of reception and aforementioned control reference signal, generate
One light modulation signal；And
One power conversion module is electrically connected with aforementioned comparator module, light-adjusting module respectively, and power conversion module will control
Reference signal and the cycle synchronisation of light modulation signal are to export brightness of the dimming control signal to adjust illuminator；
When aforementioned comparator module exports the control reference signal of tool offset voltage, the period of control reference signal and limited peak value
Property continuous wave input signal input light-adjusting module, light-adjusting module generates light modulation signal and is transferred to power conversion module, power supply conversion
Module will control reference signal and dim the cycle synchronisation of signal, and dimming control system is enabled to control under middle high brightness in illuminator
Simulation light modulation enters the digital dimming of fixed frequency in low-light level, and intermediate conversion does not generate the gap drop of conversion.
2. dimming control system according to claim 1, it is characterised in that: the comparator module is positive feedback control
System, then power conversion module will control reference signal clamp in the positive peak of light modulation signal.
3. the dimming control system according to claim 2, it is characterised in that: the positive peak of the light modulation signal is the period
The peak voltage of property continuous wave input signal.
4. dimming control system according to claim 1, it is characterised in that: the comparator module is negative-feedback control
System, then power conversion module will control reference signal clamp in the negative peak of light modulation signal.
5. the dimming control system according to claim 4, it is characterised in that: the negative peak of the light modulation signal is the period
The peak voltage of property continuous wave input signal.
6. dimming control system according to claim 1, it is characterised in that: the periodical continuous wave input signal is
Sawtooth wave, triangular wave or the string wave of cycle stability, and the limited peak value is in the voltage range of offset voltage.
7. dimming control system according to claim 1, it is characterised in that: the error amplifier block, comparator
A compensating electric capacity is electrically connected between module and light-adjusting module jointly, the compensating electric capacity generates offset voltage.
8. dimming control system according to claim 1, it is characterised in that: the one decoupling electricity of light-adjusting module connection
Hold, and the voltage on decoupling capacitor is the periodical continuous wave input signal of aforementioned limited peak value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710861269.2A CN109526091B (en) | 2017-09-20 | 2017-09-20 | Dimming control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710861269.2A CN109526091B (en) | 2017-09-20 | 2017-09-20 | Dimming control system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109526091A true CN109526091A (en) | 2019-03-26 |
| CN109526091B CN109526091B (en) | 2021-02-19 |
Family
ID=65769635
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710861269.2A Active CN109526091B (en) | 2017-09-20 | 2017-09-20 | Dimming control system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109526091B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114071837A (en) * | 2020-08-07 | 2022-02-18 | 全汉企业股份有限公司 | Lighting power supply circuit with dimming function and control method thereof |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1967652A (en) * | 2005-11-18 | 2007-05-23 | 联昌电子企业股份有限公司 | Synchronizing frequency doubling signal generating device and method |
| CN101426313A (en) * | 2008-12-04 | 2009-05-06 | 上海广电光电子有限公司 | Back light source driving method for LED |
| TWM359771U (en) * | 2008-12-30 | 2009-06-21 | Top Victory Invest Ltd | Backlight driving device with dual dimming |
| CN101836505A (en) * | 2007-10-25 | 2010-09-15 | 松下电工株式会社 | LED dimming apparatus |
| CN102196621A (en) * | 2010-03-19 | 2011-09-21 | 上海贝岭股份有限公司 | LED dimming circuit |
| CN102484918A (en) * | 2009-08-26 | 2012-05-30 | 皇家飞利浦电子股份有限公司 | Method and apparatus for controlling dimming levels of leds |
| US20130038233A1 (en) * | 2011-08-12 | 2013-02-14 | Raydium Semiconductor Corporation | Led driver |
| TWM479575U (en) * | 2014-01-21 | 2014-06-01 | Rosenlite Inc | Dimmable and suppressible blinking light emitting diode driving apparatus without electrolytic capacitors |
| CN105050298A (en) * | 2015-09-09 | 2015-11-11 | 广州达森灯光股份有限公司 | LED dimming circuit device |
| TWM518302U (en) * | 2015-11-27 | 2016-03-01 | Avertronics Inc | LED lamp dimming control device |
| CN106535412A (en) * | 2016-12-21 | 2017-03-22 | 贵州恒芯微电子科技有限公司 | Digital-analogue dimming circuit with shared port |
| US20170265274A1 (en) * | 2016-03-13 | 2017-09-14 | Yvette Seifert Hirth | Low-Voltage Alternating Current-Based Led Light With Built-In Cooling And Automatic Or Manual Dimming |
-
2017
- 2017-09-20 CN CN201710861269.2A patent/CN109526091B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1967652A (en) * | 2005-11-18 | 2007-05-23 | 联昌电子企业股份有限公司 | Synchronizing frequency doubling signal generating device and method |
| CN101836505A (en) * | 2007-10-25 | 2010-09-15 | 松下电工株式会社 | LED dimming apparatus |
| CN101426313A (en) * | 2008-12-04 | 2009-05-06 | 上海广电光电子有限公司 | Back light source driving method for LED |
| TWM359771U (en) * | 2008-12-30 | 2009-06-21 | Top Victory Invest Ltd | Backlight driving device with dual dimming |
| CN102484918A (en) * | 2009-08-26 | 2012-05-30 | 皇家飞利浦电子股份有限公司 | Method and apparatus for controlling dimming levels of leds |
| CN102196621A (en) * | 2010-03-19 | 2011-09-21 | 上海贝岭股份有限公司 | LED dimming circuit |
| US20130038233A1 (en) * | 2011-08-12 | 2013-02-14 | Raydium Semiconductor Corporation | Led driver |
| TWM479575U (en) * | 2014-01-21 | 2014-06-01 | Rosenlite Inc | Dimmable and suppressible blinking light emitting diode driving apparatus without electrolytic capacitors |
| CN105050298A (en) * | 2015-09-09 | 2015-11-11 | 广州达森灯光股份有限公司 | LED dimming circuit device |
| TWM518302U (en) * | 2015-11-27 | 2016-03-01 | Avertronics Inc | LED lamp dimming control device |
| US20170265274A1 (en) * | 2016-03-13 | 2017-09-14 | Yvette Seifert Hirth | Low-Voltage Alternating Current-Based Led Light With Built-In Cooling And Automatic Or Manual Dimming |
| CN106535412A (en) * | 2016-12-21 | 2017-03-22 | 贵州恒芯微电子科技有限公司 | Digital-analogue dimming circuit with shared port |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114071837A (en) * | 2020-08-07 | 2022-02-18 | 全汉企业股份有限公司 | Lighting power supply circuit with dimming function and control method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109526091B (en) | 2021-02-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8350488B2 (en) | Integrated backlight control system | |
| CN103037597B (en) | Multi-channel LED (Light Emitting Diode) constant current control circuit and LED light source control system | |
| CN105813255B (en) | Has the light emitting diode illuminating apparatus that clock-pulse width modulates brightness adjustment control | |
| CN103747576B (en) | A kind of LED backlight drive circuit and driving method thereof | |
| CN101754541A (en) | DC bus voltage following control circuit suitable for multi-path parallel LEDs | |
| CN107484299B (en) | LED lamp brightness and color temperature adjusting control circuit based on one-way PWM and implementation method thereof | |
| CN106101591B (en) | The method of adjustment of LCD TV and its backlight driving voltage, device | |
| EP3457814B1 (en) | Dimming control optimization system | |
| CN105120575A (en) | LED wide-scope accurate light modulation circuit | |
| CN201781654U (en) | DC bus voltage following type control circuit applicable to LEDs adopting multi-path parallel connection | |
| WO2013000410A1 (en) | Light emitting diode(led) driving device | |
| CN109526091A (en) | Dimming control system | |
| CN203554294U (en) | Power supply circuit and LCD television | |
| CN102958240B (en) | Light source device and dimming control circuit thereof | |
| CN205029925U (en) | Accurate dimmer circuit of LED wide region | |
| CN111194119A (en) | LED driving circuit and method capable of being controlled by switching and dimming | |
| CN104112429B (en) | The drive circuit of the LED-backlit of liquid crystal indicator | |
| CN201965499U (en) | Digital voltage controlled direct current constant current power supply device | |
| TWI621373B (en) | Dimming control optimization system | |
| CN106231727B (en) | Produce method, reverse-blocking tetrode thyristor light-dimming method and the device of stable DC electric signal | |
| CN211378326U (en) | But LED drive circuit of switch control of adjusting luminance | |
| CN212752683U (en) | Lamps and lanterns network deployment controlling means | |
| CN208046979U (en) | A kind of synchronous light adjusting system | |
| CN103582234A (en) | Light source dimming control circuit | |
| JP3214350U (en) | Dimming control optimization system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |