CN109362155A - A kind of device for preventing LED from flashing - Google Patents
A kind of device for preventing LED from flashing Download PDFInfo
- Publication number
- CN109362155A CN109362155A CN201811377093.4A CN201811377093A CN109362155A CN 109362155 A CN109362155 A CN 109362155A CN 201811377093 A CN201811377093 A CN 201811377093A CN 109362155 A CN109362155 A CN 109362155A
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- CN
- China
- Prior art keywords
- duty ratio
- led
- module
- light
- difference
- 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.)
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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
Abstract
The invention belongs to field of LED illumination, more particularly to a kind of device for preventing LED from flashing comprising optical sensor, 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 according to the change of environment illumination intensity by device, and light-adjusting module is made smoothly to change the brightness of LED, and LED is avoided to generate scintillation.
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.
It includes data portion, control unit, adjustment portion, and control unit is according to the output of data portion, dynamically control and regulation portion
Operation；
The data portion includes:
Optical sensor is used to detect environment illumination intensity；
Drive module generates pulsewidth signal and time pulse signal according to the variation of the environment illumination intensity, and exports extremely
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；
Control unit is configured as:
When the environment illumination intensity change that optical sensor measures, show that the brightness of environment changes, LED needs to change
Brightness is more to match lighting requirement, then drive module generates pulsewidth signal and time pulse signal, computing module calculate corresponding
First duty ratio, the second duty ratio in the first duty ratio and storage chip are absolute by the difference that difference circuit both obtains
Value, difference circuit will be in absolute differences 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: change of the present invention according to environment illumination intensity, duty ratio is input to different
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
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 data portion 1, control unit 2, adjustment portion 3,2 basis of control unit
The operation in the testing result of data portion 1 dynamically control and regulation portion 3；
Data portion 1, by optical sensor 11, drive module 12 is formed, in which:
Optical sensor 11 is used to measure the intensity of illumination of environment,
Drive module 12 transmits environment illumination intensity variation according to optical sensor and generates pulsewidth signal and time pulse signal
And it is 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 or attenuator 32 will
It is inputted in light-adjusting module 33 after duty ratio amplification or decaying that judgment module 22 exports；Light-adjusting module 33 is according to amplifier 31 or declines
Subtract the brightness of the duty ratio adjustment LED of the output of device 32；
Control unit 2 and optical sensor 11, drive module 12, amplifier 31, attenuator 32,32 signal of light-adjusting module connect
It connects, and is configured that
When the environment illumination intensity change that optical sensor 11 measures, show that the brightness of environment changes, LED will change
To meet lighting requirement, drive module 11 generates pulsewidth signal and time pulse signal for brightness, and computing module 21 calculates corresponding the
One duty ratio, the second duty ratio in the first duty ratio and storage chip 221 are exhausted by the difference that difference circuit 222 both obtains
To value, 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 adjustment 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 adjustment module 33, comparison circuit 223 improves LED luminance according to environment or reduces the control of 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 32 after amplifier 311 or attenuator 312 are handled, so that light-adjusting module 32 can be smoothly
The brightness for changing 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 device for preventing LED from flashing, which is characterized in that external control signal is converted into reasonably dimming signal by it
The brightness for adjusting LED, to avoid or mitigate the flashing of LED.
2. a kind of device for preventing LED from flashing comprising data portion, control unit, adjustment portion, control unit is according to the defeated of data portion
Out, the dynamically operation in control and regulation portion；It is characterized in that,
The data portion includes:
Optical sensor is used to detect environment illumination intensity；
Drive module generates pulsewidth signal and time pulse signal according to the variation of the environment illumination intensity, and exports to described
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:
When the environment illumination intensity that optical sensor measures changes, drive module generates pulsewidth signal and time pulse signal, calculates mould
Block calculates corresponding first duty ratio, and the second duty ratio in the first duty ratio and storage chip obtains two by difference circuit
The absolute difference of person, difference circuit will be in absolute differences 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 |
|---|---|---|---|
| CN201811377093.4A CN109362155A (en) | 2018-11-19 | 2018-11-19 | A kind of device for preventing LED from flashing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811377093.4A CN109362155A (en) | 2018-11-19 | 2018-11-19 | A kind of device for preventing LED from flashing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109362155A true CN109362155A (en) | 2019-02-19 |
Family
ID=65332193
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811377093.4A Pending CN109362155A (en) | 2018-11-19 | 2018-11-19 | A kind of device for preventing LED from flashing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109362155A (en) |
Citations (4)
| 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 |
| CN103200735A (en) * | 2013-03-06 | 2013-07-10 | 广州凯盛电子科技有限公司 | Light-emitting diode (LED) actuator preventing LED from flickering |
| CN205179441U (en) * | 2015-09-10 | 2016-04-20 | 天津工业大学 | Indoor LED lighting system of intelligence bluetooth of mobile phone control |
| CN106714391A (en) * | 2017-03-07 | 2017-05-24 | 苏州佳世达电通有限公司 | Dimming device and dimming method thereof |
-
2018
- 2018-11-19 CN CN201811377093.4A patent/CN109362155A/en active Pending
Patent Citations (4)
| 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 |
| CN103200735A (en) * | 2013-03-06 | 2013-07-10 | 广州凯盛电子科技有限公司 | Light-emitting diode (LED) actuator preventing LED from flickering |
| CN205179441U (en) * | 2015-09-10 | 2016-04-20 | 天津工业大学 | Indoor LED lighting system of intelligence bluetooth of mobile phone control |
| CN106714391A (en) * | 2017-03-07 | 2017-05-24 | 苏州佳世达电通有限公司 | Dimming device and dimming method thereof |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
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| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20190219 |