CN106714372A - LED dimming method and LED dimming circuit - Google Patents
LED dimming method and LED dimming circuit Download PDFInfo
- Publication number
- CN106714372A CN106714372A CN201611179519.6A CN201611179519A CN106714372A CN 106714372 A CN106714372 A CN 106714372A CN 201611179519 A CN201611179519 A CN 201611179519A CN 106714372 A CN106714372 A CN 106714372A
- Authority
- CN
- China
- Prior art keywords
- voltage
- drive
- led
- driving
- current
- 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.)
- Pending
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]
- H05B45/10—Controlling the intensity of the light
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention discloses an LED dimming method and an LED dimming circuit. The method comprises the following steps: adjusting a driving voltage output by a voltage driving circuit in an LED driving power supply; determining whether the current driving voltage meets a preset driving mode switching condition; and if the current driving voltage meets the preset driving mode switching condition, adjusting a driving current output by the LED driving power supply, providing a constant current for an LED load, and carrying out dimming. The flash problem in the full brightness range of LED dimming is solved. Soft and gradual change of LED light is realized.
Description
Technical field
The present invention relates to LED illumination control technology field, more particularly to a kind of LED light-dimming methods and circuit.
Background technology
Light emitting diode (Light Emitting Diode, LED) illumination is with the spy such as its low in energy consumption, long lifespan, light efficiency be high
Point has progressively been popularized and as main flow lighting engineering, simultaneously because its fast response time, luminous intensity and driving current are into just
The characteristic of ratio so that LED light regulating technologies have possessed application conditions basic.Conventional LED light regulating technologies are with PWM (Pulse at present
Width Modulation, pulse width modulation) technology, based on the combination of constant-current drive technology or both.
PWM technologies are the time scales for controlling LED to be switched on and off by carrying out high-frequency switch to LED, and are utilized
The visual persistence effect of human eye realizes light modulation.The advantage is that and realize fairly simple, circuit cost is low.But there is also several obvious
Problem：
1) as switching frequency relatively low (about below 5KHz), visually there is flickering, it is especially particularly evident in low-light level；
2) maximum current is always worked in LED openings, and is substantially dropped during the luminous light efficiency smaller current of LED under high current
It is low, therefore PWM light regulating technologies make the whole lighting efficiency of LED relatively low；3) improving switching frequency can substantially increase the switch of circuit
Loss, reduces operating efficiency, and cost can be dramatically increased；4) because circuit is in switch, the electromagnetic interference for externally producing
Than more serious；5) under video capture especially slow motion, easily there is ripple or flicker interference in scene.
Make LED operation under constant current drive pattern by constant-current dimming technology, the major part of PWM dimming modes can be avoided
Problem, but obvious shortcoming is there is also, it is mainly reflected in：
Illuminating LED operation electric current span is very big, rated current generally in more than 300mA, but below 100uA's
Weak current can be lighted.Its operating current is spanned more than three orders of magnitude, and this brings very big difficulty to circuit design,
It is difficult to the light modulation in the range of total current.
For these reasons, the brightness of constant-current dimming method is adjustable is limited in scope, it is impossible to cover low-light level occasion；Cannot be real
The existing LED illumination product gradually dark effect that gets brighter smooth when lamping on and off, it is difficult to build soft comfortable light atmosphere.
Prior art also has a kind of method, with reference to PWM and constant-current dimming technology, is adjusted using constant current in brightness occasion higher
Light technology, uses PWM light regulating technologies, but still cannot solve the congenital of PWM technologies under low-light level in the relatively low occasion of brightness
Defect.
The content of the invention
In view of this, the purpose of the present invention is to propose to a kind of LED light-dimming methods and circuit, to solve LED light modulation full brightnesses
In the range of stroboscopic problem, realize the soft gradual change of LED light line.
To achieve the above object, the present invention is adopted the following technical scheme that：
In a first aspect, a kind of LED light-dimming methods are the embodiment of the invention provides, including：
The driving voltage of Voltag driving circuit output in regulation LED drive power；
Determine whether present drive voltage meets default type of drive switch condition；
If meeting, the driving current of the LED drive power output is adjusted, driven for LED load provides constant electric current
Move and dimmed.
Second aspect, the embodiment of the invention provides a kind of LED light adjusting circuits, including：
Driving voltage module, the driving voltage for adjusting Voltag driving circuit output in LED drive power；
Determining module is driven, for determining whether present drive voltage meets default type of drive switch condition；
Load drive module, if determining that present drive voltage meets the type of drive and turns for the driving determining module
Condition is changed, then adjusts the driving current of the LED drive power output, driven and realize for LED load provides constant electric current
Light modulation.
The beneficial effects of the invention are as follows：LED light-dimming methods and circuit that the present invention is provided, driving power supply can be negative for LED
Carry and driving voltage and driving current are provided, driven by voltage and electric current drives, realize the light modulation to LED load.With reference to constant current
With the type of drive of constant pressure, it is possible to achieve the light modulation in the full current margins of LED, realize in the range of LED full brightnesses it is constant,
Do not flash, the dimming function without additional interference, build soft, comfortable light atmosphere, be obviously improved light quality and use
Experience at family.
Brief description of the drawings
Exemplary embodiment of the invention will be described in detail by referring to accompanying drawing below, make one of ordinary skill in the art
Above-mentioned and other feature and advantage of the invention are become apparent from, in accompanying drawing：
Fig. 1 is a kind of schematic flow sheet of LED light-dimming methods that the embodiment of the present invention one is provided；
Fig. 2 is the LED current voltage curve schematic diagram that the embodiment of the present invention one is provided；
Fig. 3 is a kind of schematic flow sheet of LED light-dimming methods that the embodiment of the present invention two is provided；
Fig. 4 is a kind of structured flowchart of LED light adjusting circuits that the embodiment of the present invention three is provided.
Specific embodiment
Further illustrate technical scheme below in conjunction with the accompanying drawings and by specific embodiment.May be appreciated
It is that specific embodiment described herein is used only for explaining the present invention, rather than limitation of the invention.Further need exist for explanation
, for the ease of description, part rather than entire infrastructure related to the present invention is illustrate only in accompanying drawing.
Embodiment one
Fig. 1 is a kind of schematic flow sheet of LED light-dimming methods that the embodiment of the present invention one is provided.The method is applied to LED
The situation of light modulation is loaded, the method can be performed by LED light adjusting circuits.LED light adjusting circuits can be by software and/or hardware
Mode is realized.As shown in figure 1, the method includes：
The driving voltage of Voltag driving circuit output in step 110, regulation LED drive power.
When LED load starts to light, the driving voltage in regulation LED drive power drives for LED load provides constant pressure.
Wherein, LED drive power includes：Voltage drives and electric current drives.
Step 120, determine whether present drive voltage meets default type of drive switch condition.
Further, if present drive voltage is more than beginning luminous point voltage, and driven less than minimum current constant current is met
The driving conversion voltage of condition, it is determined that present drive voltage is unsatisfactory for type of drive switch condition；If present drive voltage reaches
Voltage is changed to the driving for meeting minimum current constant current drive condition, and less than maximum operating currenbt point voltage, it is determined that it is current
Driving voltage meets type of drive switch condition.Wherein, it is driving voltage when LED load starts luminous to start luminous point voltage,
Critical driving voltage when driving conversion voltage is LED load conversion type of drive.Alternatively, the determination bag of conversion voltage is driven
Include：According to the voltage response of LED load, drive circuit can constant current operation minimum current and operating temperature, it is determined that driving
Dynamic conversion voltage.It is different for the voltage response of different LED loads, the type of drive switch condition of setting is not
Together；For the different operating temperature of same LED load, the voltage response of LED load is also different, the driving side of setting
Formula switch condition is also different；Minimum current, corresponding LED operation voltage are driven for the constant current that different circuit parameters are met
Difference, the type of drive switch condition of setting is also different；The circuit of same hardware configuration can be by setting different driving sides
Formula switch condition, realizes the light modulation to different LED loads under different working condition.Alternatively, default type of drive conversion
Condition can be judged, when output current value is more than according to driving adjustment electric current to be configured according to LED load output current
During default driving adjustment electric current, constant pressure type of drive is converted into constant current drive mode.
If step 130, satisfaction, the driving current of regulation LED drive power output, for LED load provides constant electricity
Stream drives and is dimmed.
When the driving voltage of LED load meets default type of drive switch condition, driving current is changed to for LED load
There is provided constant current to drive, continuation dims LED load.
Fig. 2 is the LED load current-voltage correlation curve synoptic diagram that the embodiment of the present invention one is provided；Wherein, A points are LED
The beginning luminous point of load, need not be dimmed before A points, and C points are maximum operating currenbt point.The corresponding LED load electricity of A points
Generally in the range of tens microamperes to 100 microamperes, the corresponding LED load electric current of C points is generally between 100mA~1.5A for stream.B
It is flex point that current curve slope is significantly improved, and B points are defined as LED load and are driven the point that mode is changed, will B points
Corresponding LED load voltage is used as driving conversion voltage, or adjusts electric current using the corresponding LED load electric current of B points as driving.B
The electric current of point is generally 1%~5% or so of C point electric currents.Be can see according to the curve, in order to be able to allow LED load sending out entirely
Dimming function is realized in the range of photoelectric current, the driving current of LED load must be adjusted from few tens of microamps to hundreds of milliamperes
It is whole, the function of constant-current source control is generally realized by gathering the voltage on sampling resistor due to electronic circuit, in low current
The reasons such as the quantization error due to the error of electronic device, the offset voltage of amplifying circuit and digital circuit, so high accuracy
Constant-current drive circuit it is extremely difficult in realization.
It is relatively low with voltage curve slope to the electric current between B points in A points by Fig. 2 curves, and with the reduction of electric current,
The slope is in the state for gradually reducing.Accordingly, the change of the driving current of interval LED load has corresponded to obvious driving herein
Voltage change, and electric current it is lower when the change it is more notable.According to this principle, driven first with constant pressure is carried out to LED load
Light modulation, after the curtage of LED load reaches B points, is then driven with constant current and LED load is dimmed.
So that white-light illuminating is with LED as an example, single LEDs are supported on A point voltage typically 2.5V or so, B point voltages and are typically
3.2V or so, C point voltage are typically 3.4V or so.It can be seen that, although A points are to the curent change very little of B, voltage change range
But clearly；Therefore, interval in A to the B of LED load work, it is right to be realized by adjusting the driving voltage of LED load
The brightness adjustment control of LED load, and then realize dimming function.Because electronic circuit realizes that the voltage adjustment of the excursion is simpler
It is single, therefore can realize that LED load is dimmed by adjusting the method for driving voltage at A to B sections.In B to the C of LED load work
Section, because LED load operating current is larger, electronic circuit can then be relatively easy to realizes that constant current drives, therefore, at B to C sections
Can realize that LED load is dimmed by adjusting the method for driving current.
Further, the method can be applied in the light gradient control during LED load is lamped on and off.Opening
Lamp and during turning off the light, the working condition of LED load will necessarily experience the change procedure of A points and B points, logical according to above-mentioned principle
The driving voltage for crossing slow adjustment LED load can make the working condition of LED load slowly realize the transformation from A points to B points.By
When closer to A points, LED load operating current is lower with the corresponding slope of voltage, therefore, the change of LED load luminous intensity
Also it is slower.Then can realize that light is slowly varying by adjusting the constant current driving method of electric current between B points and C points.According to
This principle can realize the slow smooth change in switch lamp of LED load light.This slow switch light can be applied
In occasions such as movie theatre, music hall, the Art Museums, fully build releive, graceful atmosphere.
A kind of LED light-dimming methods that the embodiment of the present invention one is provided, driving power supply is driven for LED load provides constant pressure first
Dynamic, after driving voltage meets type of drive switch condition, driving power supply drives for LED load provides constant current, continues negative to LED
It is loaded into going light modulation, it is real with reference to constant current and the type of drive of constant pressure, it is possible to achieve the light modulation in the full current margin of LED load
In the range of existing LED load full brightness it is constant, do not flash, the dimming function without additional interference, build soft, comfortable light
Atmosphere, is obviously improved light quality and Consumer's Experience.
Embodiment two
Fig. 3 is a kind of schematic flow sheet of LED light-dimming methods that the embodiment of the present invention two is provided.The present embodiment is with above-mentioned
It is optimized based on embodiment, in the present embodiment, will determines whether present drive voltage meets default type of drive
Switch condition is optimized for：Input current of load current feedback LED load exported by feedback circuit to LED drive power
End；The source current of regulation LED drive power output, and source current is converted into equivalent voltage；Compare equivalent voltage and LED
The supply voltage of driving power supply output；Determine whether present drive voltage meets type of drive switch condition according to comparative result.
The method of the present embodiment mainly includes：
The driving voltage of Voltag driving circuit output in step 310, regulation LED drive power.
The input electricity of step 320, the load current feedback exported LED load by feedback circuit to LED drive power
Stream end.
Step 330, the source current of regulation LED drive power output, and source current is converted into equivalent voltage.
In the present embodiment, the electric current for LED load being exported makes the difference with the driving adjustment electric current for pre-setting, according to difference
The electric current of regulation LED drive power output, and source current is converted into equivalent voltage.Wherein, it is foundation to drive adjustment electric current
The voltage response of LED load, drive circuit can constant current operation minimum current and operating temperature determine.
Step 340, the supply voltage for comparing equivalent voltage and LED drive power output, determine current according to comparative result
Whether driving voltage meets type of drive switch condition.
Further, if equivalent voltage is equal to or more than supply voltage, it is determined that present drive voltage meets type of drive
Switch condition；Otherwise, it determines present drive voltage is unsatisfactory for type of drive switch condition.It should be noted that working as driving voltage
When meeting type of drive switch condition, type of drive is driven by constant pressure and is converted into constant current driving, accordingly, when driving voltage is discontented
During sufficient type of drive switch condition, type of drive continues to keep constant pressure to drive.
If step 350, satisfaction, the driving current of regulation LED drive power output, for LED load provides constant electricity
Stream drives and is dimmed.
It should be noted that the present embodiment be also applied for by LED load by high brightness adjust to low-light level situation, this
When, LED load drives for constant current, and whether the voltage that can be exported according to current LED load meets default type of drive conversion
Condition is judged the type of drive of LED load, when the output voltage of LED load is less than default type of drive switch condition
In magnitude of voltage when, by constant current drive be changed to constant pressure drive；The output voltage of LED load can also be fed back to LED and drive electricity
The Input voltage terminal in source, adjusts the output voltage of LED drive power, when output voltage drives output less than or equal to constant current
During equivalent voltage, then the driving voltage of LED drive power output is adjusted, drive and carry out for LED load provides constant voltage
Light modulation.
A kind of LED light-dimming methods that the embodiment of the present invention two is provided, have been carried out excellent on the basis of the embodiment of the present invention one
Change, when default type of drive switch condition can not meet LED load light modulation needs, can be by introducing closed loop feedback electricity
Road, completes the dynamic adjustment to default type of drive switch condition；Fed back to by the curtage for exporting LED load
LED drive power, adjustment electric current drives and voltage drives, and compares the equivalent voltage value of both outputs, by the drive that magnitude of voltage is larger
Flowing mode drives LED load, is dimmed.By constant current and the type of drive of constant pressure, it is possible to achieve the full operating current of LED load
In the range of light modulation, realize in the range of LED load full brightness it is constant, do not flash, the dimming function without additional interference, build
Soft, comfortable light atmosphere, is obviously improved light quality and Consumer's Experience.
Embodiment three
Fig. 4 is a kind of structured flowchart of LED light adjusting circuits that the embodiment of the present invention three is provided.As shown in figure 4, being somebody's turn to do and circuit
Including：Driving voltage module 410, driving determining module 420 and load drive module 430, wherein：
Driving voltage module 410, the driving voltage for adjusting Voltag driving circuit output in LED drive power；Drive
Determining module 420, for determining whether present drive voltage meets default type of drive switch condition；Load drive module
430, if driving determining module 420 to determine that present drive voltage meets type of drive switch condition, regulation LED drive power is defeated
The driving current for going out, drives and is dimmed for LED load provides constant electric current.
Further, light adjusting circuit includes：Drive conversion voltage module, for according to LED load voltage response,
Drive circuit can constant current operation minimum current and operating temperature, it is determined that drive conversion voltage.
Alternatively, driving determining module 420 includes：First drives determining unit, if be more than for present drive voltage opening
Luminous point voltage is originated, and voltage is changed less than the driving for meeting minimum current constant current drive condition, it is determined that present drive voltage
It is unsatisfactory for type of drive switch condition；Second drives determining unit, if driving conversion voltage is reached for present drive voltage, and
Less than maximum operating currenbt point voltage, it is determined that present drive voltage meets type of drive switch condition.
Alternatively, driving determining module 420 includes：Load circuit feedback unit, for by feedback circuit by LED load
The load current feedback of output is to the input current end of LED drive power；Power circuit conditioning unit, drives for adjusting LED
The source current of power supply output, and source current is converted into equivalent voltage；Voltage comparison unit, for compare equivalent voltage and
The supply voltage of LED drive power output；Determining unit is driven, for determining whether present drive voltage is full according to comparative result
Sufficient type of drive switch condition.
Further, drive determining unit specifically for：If equivalent voltage is equal to or more than present operating voltage, it is determined that
Present drive voltage meets type of drive switch condition；Otherwise, it determines present drive voltage is unsatisfactory for type of drive switch condition.
A kind of LED light adjusting circuits that the present embodiment is provided, when LED load is started working, driving voltage module 410 is first
The driving voltage of regulation Voltag driving circuit output is powered for LED load；Meanwhile, determining module 420 is driven, constantly judge current
Whether driving voltage meets, and drives what conversion voltage module determined according to the voltage response and operating temperature of LED load
Drive conversion voltage；If driving determining module 420 to determine that present drive voltage meets type of drive switch condition, load drives mould
Block 430 then adjusts the driving current of LED drive power output, drives and is dimmed for LED load provides constant electric current.It is logical
Cross the type of drive of constant current and constant pressure, it is possible to achieve the light modulation in the full current margins of LED, lift light quality and user
Experience.
A kind of LED light adjusting circuits that the present embodiment is provided, a kind of LED light modulation sides provided with any embodiment of the present invention
It is owned by France to can perform a kind of LED light-dimming methods that any embodiment of the present invention is provided in same inventive concept, possess corresponding work(
Energy and beneficial effect.Not ins and outs of detailed description in the present embodiment, reference can be made to any embodiment of the present invention provide one
Plant LED light-dimming methods.
Note, above are only presently preferred embodiments of the present invention and institute's application technology principle.It will be appreciated by those skilled in the art that
The invention is not restricted to specific embodiment described here, can carry out for a person skilled in the art various obvious changes,
Readjust and substitute without departing from protection scope of the present invention.Therefore, although the present invention is carried out by above example
It is described in further detail, but the present invention is not limited only to above example, without departing from the inventive concept, also
More other Equivalent embodiments can be included, and the scope of the present invention is determined by scope of the appended claims.
Claims (10)
1. a kind of LED light-dimming methods, it is characterised in that including：
The driving voltage of Voltag driving circuit output in regulation LED drive power；
Determine whether present drive voltage meets default type of drive switch condition；
If meeting, the driving current of the LED drive power output is adjusted, driven simultaneously for LED load provides constant electric current
Dimmed.
2. light-dimming method according to claim 1, it is characterised in that whether the determination present drive voltage meets default
Type of drive switch condition, including：
If present drive voltage is more than beginning luminous point voltage, and is changed less than the driving for meeting minimum current constant current drive condition
Voltage, it is determined that present drive voltage is unsatisfactory for the type of drive switch condition；
If present drive voltage reaches described driving changes voltage, and less than maximum operating currenbt point voltage, it is determined that work as forerunner
Dynamic voltage meets the type of drive switch condition.
3. light-dimming method according to claim 2, it is characterised in that the determination of the driving conversion voltage includes：
According to the voltage response of LED load, drive circuit can constant current operation minimum current and operating temperature, determine institute
State driving conversion voltage.
4. light-dimming method according to claim 1, it is characterised in that whether the determination present drive voltage meets default
Type of drive switch condition, including：
Load current feedback LED load exported by feedback circuit is to the input current end of LED drive power；
The source current of the LED drive power output is adjusted, and the source current is converted into equivalent voltage；
Compare the supply voltage of the equivalent voltage and LED drive power output；
Determine whether present drive voltage meets the type of drive switch condition according to comparative result.
5. light-dimming method according to claim 4, it is characterised in that described to determine present drive voltage according to comparative result
Whether the type of drive switch condition is met, including：
If the equivalent voltage is equal to or more than the supply voltage, it is determined that present drive voltage meets the type of drive and turns
Change condition；Otherwise, it determines present drive voltage is unsatisfactory for the type of drive switch condition.
6. a kind of LED light adjusting circuits, it is characterised in that including：
Driving voltage module, the driving voltage for adjusting Voltag driving circuit output in LED drive power；
Determining module is driven, for determining whether present drive voltage meets default type of drive switch condition；
Load drive module, if the driving determining module determines that present drive voltage meets the type of drive switch condition,
The driving current of the LED drive power output is then adjusted, is driven and is dimmed for LED load provides constant electric current.
7. light adjusting circuit according to claim 6, it is characterised in that the driving determining module includes：
First drives determining unit, if for present drive voltage more than starting luminous point voltage, and less than meeting minimum current
The driving conversion voltage of constant current drive condition, it is determined that present drive voltage is unsatisfactory for the type of drive switch condition；
Second drives determining unit, if reaching described driving for present drive voltage changes voltage, and less than maximum functional electricity
Flow point voltage, it is determined that present drive voltage meets the type of drive switch condition.
8. light adjusting circuit according to claim 7, it is characterised in that including：
Drive conversion voltage module, for according to the voltage response of LED load, drive circuit can constant current operation minimum electricity
Stream and operating temperature, determine that described driving changes voltage.
9. light adjusting circuit according to claim 6, it is characterised in that the driving determining module includes：
Load circuit feedback unit, for the load current feedback that is exported LED load by feedback circuit to LED drive power
Input current end；
Power circuit conditioning unit, for adjusting the source current of the LED drive power output, and the source current is turned
It is changed to equivalent voltage；
Voltage comparison unit, the supply voltage for comparing the equivalent voltage and LED drive power output；
Determining unit is driven, for determining whether present drive voltage meets the type of drive conversion stripes according to comparative result
Part.
10. light adjusting circuit according to claim 9, it is characterised in that the driving determining unit specifically for：
If the equivalent voltage is equal to or more than the supply voltage, it is determined that present drive voltage meets the type of drive and turns
Change condition；Otherwise, it determines present drive voltage is unsatisfactory for the type of drive switch condition.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2016110649563 | 2016-11-28 | ||
| CN201611064956 | 2016-11-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106714372A true CN106714372A (en) | 2017-05-24 |
Family
ID=58938361
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611179519.6A Pending CN106714372A (en) | 2016-11-28 | 2016-12-19 | LED dimming method and LED dimming circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106714372A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107230456A (en) * | 2017-08-10 | 2017-10-03 | 京东方科技集团股份有限公司 | A kind of display device and brightness adjusting method |
| CN117528858A (en) * | 2024-01-08 | 2024-02-06 | 杭州罗莱迪思科技股份有限公司 | Hidden-lighting controllable dimming lamp control method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101960922A (en) * | 2008-03-24 | 2011-01-26 | 东芝照明技术株式会社 | Power supply units and lighting fixtures |
-
2016
- 2016-12-19 CN CN201611179519.6A patent/CN106714372A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101960922A (en) * | 2008-03-24 | 2011-01-26 | 东芝照明技术株式会社 | Power supply units and lighting fixtures |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107230456A (en) * | 2017-08-10 | 2017-10-03 | 京东方科技集团股份有限公司 | A kind of display device and brightness adjusting method |
| CN117528858A (en) * | 2024-01-08 | 2024-02-06 | 杭州罗莱迪思科技股份有限公司 | Hidden-lighting controllable dimming lamp control method |
| CN117528858B (en) * | 2024-01-08 | 2024-04-09 | 杭州罗莱迪思科技股份有限公司 | Hidden-lighting controllable dimming lamp control method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8653739B2 (en) | Circuit for operating light emitting diodes (LEDs) | |
| US9642202B2 (en) | Systems and methods for dimming of a light source | |
| US9730289B1 (en) | Solid state light fixtures having ultra-low dimming capabilities and related driver circuits and methods | |
| JP4943892B2 (en) | Light control device and lighting fixture using the same | |
| US8680787B2 (en) | Load control device for a light-emitting diode light source | |
| US9301359B2 (en) | Lighting control system and method | |
| US9119262B2 (en) | Boost and linear LED control | |
| KR101111387B1 (en) | Power integrated circuit for LED lighting | |
| CN104427720B (en) | Lighting device and illumination apparatus using the same | |
| US20130113394A1 (en) | Lighting system and luminaire | |
| CN103262399A (en) | Controlled power dissipation in a switch path in a lighting system | |
| CN102668712A (en) | LED drive electric source device and LED illumination device | |
| CN103167688A (en) | lighting device | |
| CN106714372A (en) | LED dimming method and LED dimming circuit | |
| CN110741733A (en) | Method and device for driving LED | |
| CN107155243B (en) | A kind of LED lamplight control method and device | |
| JP5562081B2 (en) | LED dimming method and dimming device | |
| CN206977744U (en) | A kind of controller and chip of double LED drive systems | |
| CN114189957B (en) | Device and method for reducing low-brightness jitter of light source and lamp | |
| CA3070831C (en) | A pwm dimming circuit with low stand-by power | |
| CN106686809B (en) | A kind of adaptive LED light adjusting circuit and method | |
| CN106879127B (en) | A kind of controller, chip and the method for double LED drive systems | |
| CN105848375A (en) | Drive unit, illuminating device, illuminating system, and method for controlling illuminating system | |
| WO2013035177A1 (en) | Dimming method and dimming device for led | |
| CN104427722B (en) | Lighting device and illumination apparatus using the same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170524 |