CN109862657A - A kind of anti-Flash drives of LED - Google Patents
A kind of anti-Flash drives of LED Download PDFInfo
- Publication number
- CN109862657A CN109862657A CN201811377108.7A CN201811377108A CN109862657A CN 109862657 A CN109862657 A CN 109862657A CN 201811377108 A CN201811377108 A CN 201811377108A CN 109862657 A CN109862657 A CN 109862657A
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- China
- Prior art keywords
- led
- duty ratio
- module
- light
- input
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Classifications
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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
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Abstract
The invention belongs to field of LED illumination, more particularly to a kind of LED driver for preventing LED from flashing comprising drive module, computing module, judgment module, amplifier, attenuator, light-adjusting module, extraneous control signal is converted into pulsewidth signal and time pulse signal by drive module, computing module calculates the first duty ratio according to pulsewidth signal and time pulse signal, is handled through judgment module input amplifier or attenuator, and by treated, duty ratio inputs light-adjusting module；Duty ratio is input in different processing units and handles, light-adjusting module is made smoothly to change the brightness of LED, LED is avoided to generate scintillation according to the change of extraneous control signal by device.
Description
Technical field
The invention belongs to field of LED illumination, in particular to a kind of anti-Flash drives of LED.
Background technique
The flicker problem that LED light source occurs during switching comes from phenomenon although the duration is very short
See, be can flash during switching or it is several under, give a kind of very uncomfortable feeling of people.
Summary of the invention
A kind of device for preventing LED from flashing is provided, the control signal that the external world is transmitted can be converted into reasonably dimming news
Number the brightness of LED is adjusted, so that the LED is generated scintillation.
A kind of anti-Flash drives of LED comprising drive module, control unit, adjustment portion, control unit is according to drive module
Output, the dynamically operation in control and regulation portion；
The drive module is used to for the control signal of the raising LED luminance of external world's input or reduction LED luminance being converted into
Pulsewidth signal and time pulse signal, and export to the control unit；
The control unit is made of computing module and judgment module, in which:
The computing module is used to calculate the first duty ratio according to pulsewidth signal and time pulse signal；
The judgment module includes storage chip, difference circuit and comparison circuit, in which:
Storage chip stores the second currently used duty ratio of LED；
Difference circuit is used to calculate the absolute value of the difference of first duty ratio and second duty ratio；
Comparison circuit, according to the size relation between the absolute value and the limit value of setting, to adjustment portion output first
Duty ratio or the second duty ratio；
The adjustment portion is made of amplifier, attenuator and light-adjusting module, wherein amplifier and attenuator are by judgment module
The duty that output is exported to light-adjusting module, light-adjusting module according to amplifier or attenuator after the duty ratio of output is enlarged or reduced
Than the brightness for adjusting LED；
Difference circuit will be in the absolute value of difference and the limit value of setting input comparison circuit:
When the absolute value of difference is less than the limit value of setting, show computing module calculated first duty ratio input light modulation
LED will not be made to generate scintillation in module, then first duty ratio is input in light-adjusting module by comparison circuit；
When the absolute value of difference is greater than the limit value of setting, show computing module calculated first duty ratio input light modulation
It will cause LED flashing in module, then comparison circuit is believed according to the control of the raising LED luminance or reduction LED luminance of external world's input
Number, by the second duty ratio input amplifier or attenuator in storage chip, second duty ratio is through amplifier or decaying
Enter light-adjusting module after device processing, light-adjusting module is made smoothly to change the brightness of LED, LED is avoided to generate scintillation.
The beneficial effects of the present invention are: duty ratio is input to different by the present invention according to the change of extraneous control signal
It is handled in processing unit, light-adjusting module is made smoothly to change the brightness of LED, LED is avoided to generate scintillation.
Detailed description of the invention
Fig. 1 shows the schematic diagram of driver；
Fig. 2 shows the schematic diagrames of judgment module；
Fig. 3 shows the schematic diagram of difference circuit；
Fig. 4 shows the schematic diagram of comparison circuit；
Fig. 5 shows the control flow chart of driver；
Fig. 6 shows the theory of constitution block diagram of driver.
Specific embodiment
1-6 with reference to the accompanying drawings, the function that the structure of this system is described in detail and is realized.
A kind of LED driver for preventing LED from flashing comprising drive module 1, control unit 2, adjustment portion 3, control unit 2
According to the operation in the testing result dynamically control and regulation portion 3 of drive module 1；
The raising LED luminance of external world's input or the control signal for reducing LED luminance are converted into pulsewidth by drive module 1
Signal and time pulse signal are simultaneously input in control unit 2；
Control unit 2 is made of computing module 21, judgment module 22, in which:
Computing module 21 calculates the first duty ratio according to pulsewidth signal and time pulse signal；
Judgment module 22 comprising storage chip 221, difference circuit 222, comparison circuit 223, in which:
Storage chip 221 stores the second currently used duty ratio of device
Difference circuit 222, the device that the first duty ratio and storage chip 221 for being used to input in computing module 21 store
The absolute value of the difference of the second currently used duty ratio；
Comparison circuit 223, according to the size relation between the absolute value of difference and the limit value of system, to adjustment portion 3
The first duty ratio of middle input or the second duty ratio；
Adjustment portion 3, by amplifier 31, attenuator 32, light-adjusting module 33 is formed, and wherein amplifier 31 and attenuator 32 will
The duty ratio that judgment module 22 exports inputs in light-adjusting module 33 after being enlarged or reduced；Light-adjusting module 33 according to amplifier 31 or
The brightness for the duty ratio adjustment LED that attenuator 32 exports；
Control unit 2 and drive module 11, amplifier 31, attenuator 32, the connection of 32 signal of light-adjusting module, and be configured that
Difference circuit 222 will be in the absolute value of difference and system limit value input comparison circuit 223:
When difference absolute value be less than system limit value, show by calculated first duty ratio of computing module 21 input
LED will not be made to generate scintillation in light-adjusting module 33, comparison circuit 223 is defeated by calculated first duty ratio of computing module 21
Enter into light-adjusting module 33；
When difference absolute value be greater than system limit value, show by calculated first duty ratio of computing module 21 input
It will cause LED light group flashing in light-adjusting module 33, comparison circuit 223 is according to the extraneous control for improving LED luminance or reducing LED luminance
For signal processed by device in storage chip 221 current the second duty ratio input amplifier 31 or attenuator 32, device is current
Second duty ratio enters in light-adjusting module 33 after amplifier 31 or attenuator 32 are handled, so that light-adjusting module 33 can smoothly change
The brightness for becoming LED will not make LED generate scintillation.
One skilled in the art would recognize that without departing substantially from the spirit and scope of the invention as generally describing,
Various variations and/or modification can be carried out to invention shown in each specific embodiment.Therefore, in terms of all
For, embodiment here is considered as illustrative and and non-limiting.Equally, the present invention includes any feature
Combination, the combination of any feature especially in Patent right requirement, even if the combination of this feature or feature is not in patent
It is explicitely stated in claim or each embodiment here.
Claims (2)
1. a kind of anti-Flash drives of LED, which is characterized in that it is converted into external control signal reasonably to dim signal to adjust
The brightness of whole LED, to avoid or mitigate the flashing of LED.
2. a kind of anti-Flash drives of LED comprising drive module, control unit, adjustment portion, control unit is according to the defeated of drive module
Out, the dynamically operation in control and regulation portion；It is characterized in that,
The drive module is used to the control signal of the raising LED luminance of external world's input or reduction LED luminance being converted into pulsewidth
Signal and time pulse signal, and export to the control unit；
The control unit is made of computing module and judgment module, in which:
The computing module is used to calculate the first duty ratio according to pulsewidth signal and time pulse signal；
The judgment module includes storage chip, difference circuit and comparison circuit, in which:
Storage chip stores the second currently used duty ratio of LED；
Difference circuit is used to calculate the absolute value of the difference of first duty ratio and second duty ratio；
Comparison circuit exports the first duty to adjustment portion according to the size relation between the absolute value and the limit value of setting
Than or the second duty ratio；
The adjustment portion is made of amplifier, attenuator and light-adjusting module, wherein amplifier and attenuator export judgment module
Duty ratio be enlarged or reduced after output to light-adjusting module, duty ratio tune that light-adjusting module is exported according to amplifier or attenuator
The brightness of whole LED；
Control unit is configured as:
Difference circuit will be in the absolute value of difference and the limit value of setting input comparison circuit:
When the absolute value of difference is less than the limit value of setting, show computing module calculated first duty ratio input light-adjusting module
In will not make LED generate scintillation, then first duty ratio is input in light-adjusting module by comparison circuit；
When the absolute value of difference is greater than the limit value of setting, show computing module calculated first duty ratio input light-adjusting module
In will cause LED flashing, then comparison circuit according to the external world input raisings LED luminance or reduce LED luminance control signal, by
In the second duty ratio input amplifier or attenuator in storage chip, second duty ratio is handled through amplifier or attenuator
Enter light-adjusting module afterwards, light-adjusting module is made smoothly to change the brightness of LED, LED is avoided to generate scintillation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811377108.7A CN109862657A (en) | 2018-11-19 | 2018-11-19 | A kind of anti-Flash drives of LED |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811377108.7A CN109862657A (en) | 2018-11-19 | 2018-11-19 | A kind of anti-Flash drives of LED |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109862657A true CN109862657A (en) | 2019-06-07 |
Family
ID=66890121
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811377108.7A Pending CN109862657A (en) | 2018-11-19 | 2018-11-19 | A kind of anti-Flash drives of LED |
Country Status (1)
| Country | Link |
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| CN (1) | CN109862657A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102340907A (en) * | 2010-07-21 | 2012-02-01 | 立锜科技股份有限公司 | Light emitting diode (LED) controller having function of flicker removal, LED flicker removal circuit and related method |
| CN103152900A (en) * | 2011-12-07 | 2013-06-12 | 立锜科技股份有限公司 | Dimming controller and method for controlling LED brightness |
| CN103456275A (en) * | 2012-05-29 | 2013-12-18 | 乐金显示有限公司 | Backlight driver of liquid crystal display device and method for driving the same |
| CN104396348A (en) * | 2012-04-25 | 2015-03-04 | 首尔半导体株式会社 | Led dimmer, led lighting device comprising same, and method for controlling dimming of led lighting device |
| US20150124003A1 (en) * | 2013-11-01 | 2015-05-07 | Nlt Technologies, Ltd. | Led driving circuit, led driving method, and liquid crystal display device |
-
2018
- 2018-11-19 CN CN201811377108.7A patent/CN109862657A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102340907A (en) * | 2010-07-21 | 2012-02-01 | 立锜科技股份有限公司 | Light emitting diode (LED) controller having function of flicker removal, LED flicker removal circuit and related method |
| CN103152900A (en) * | 2011-12-07 | 2013-06-12 | 立锜科技股份有限公司 | Dimming controller and method for controlling LED brightness |
| CN104396348A (en) * | 2012-04-25 | 2015-03-04 | 首尔半导体株式会社 | Led dimmer, led lighting device comprising same, and method for controlling dimming of led lighting device |
| CN103456275A (en) * | 2012-05-29 | 2013-12-18 | 乐金显示有限公司 | Backlight driver of liquid crystal display device and method for driving the same |
| US20150124003A1 (en) * | 2013-11-01 | 2015-05-07 | Nlt Technologies, Ltd. | Led driving circuit, led driving method, and liquid crystal display device |
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| WD01 | Invention patent application deemed withdrawn after publication | ||
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Application publication date: 20190607 |