CN105050298B - LED light adjusting circuit device - Google Patents
LED light adjusting circuit device Download PDFInfo
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- CN105050298B CN105050298B CN201510571246.9A CN201510571246A CN105050298B CN 105050298 B CN105050298 B CN 105050298B CN 201510571246 A CN201510571246 A CN 201510571246A CN 105050298 B CN105050298 B CN 105050298B
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- input terminal
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- led light
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Abstract
The present invention relates to LED light adjusting circuit devices, including MCU, D/A converter module, PWM comparator, voltage comparator, reference voltage module, amplifier, gate driving circuit, rectification module and LED light, the input terminal of D/A converter module and the non-inverting input terminal of PWM comparator are connect with MCU, the output end of PWM comparator and the input terminal of rectification module are connect with gate driving circuit, LED light, the non-inverting input terminal of amplifier, inverting input terminal and reference voltage module are connect with the output end of rectification module, the output end of D/A converter module and the inverting input terminal of voltage comparator are connect with reference voltage module, the non-inverting input terminal of the output end connection voltage comparator of amplifier, the inverting input terminal of the output end connection PWM comparator of voltage comparator.It solves the deficiency of LED light modulation colour temperature stability difference, and can guarantee the dimming characteristic of outstanding low-light level.
Description
Technical field
The present invention relates to LED field of luminescent technology more particularly to LED light adjusting circuit devices.
Background technique
The mode that great power LED on the market generallys use simulation constant current driving at present carries out linearity light adjusting, although light modulation
Effect is preferable, but the colour temperature of LED light can generate shift phenomenon with the variation of average driving circuit.By being improved it
Afterwards, it is driven using PWM constant current and simulation constant current driving is replaced to be dimmed, although the colour temperature for being able to maintain LED light is inconvenient, with
LED is during by secretly changing to all light, it may appear that light spends the phenomenon that bright and low-light level light modulation flashing.
Summary of the invention
In view of the above technical problems, the purpose of the present invention is to provide a kind of good dimming effects, and colour temperature is stable and shines equal
Even LED light adjusting circuit device
To achieve the above object, the present invention adopts the following technical scheme:
LED light adjusting circuit device, which is characterized in that including MCU, D/A converter module, PWM comparator, voltage comparator,
Reference voltage module, amplifier, gate driving circuit, rectification module and LED light, the input terminal of the D/A converter module and
The non-inverting input terminal of PWM comparator is connect with MCU, the input terminal of the output end of the PWM comparator and rectification module with
Gate driving circuit connection, the LED light, the non-inverting input terminal of amplifier, inverting input terminal and reference voltage module with it is whole
The output end of flow module connects, and the output end of the D/A converter module and the inverting input terminal of voltage comparator are electric with reference
Die block connection, the non-inverting input terminal of the output end connection voltage comparator of the amplifier, the output end of the voltage comparator
Connect the inverting input terminal of PWM comparator.
Preferably, the rectification module includes direct current VCC, field-effect tube M1, field-effect tube M2, inductance L1 and resistance
R1, the grid of the field-effect tube M1 and the grid of field-effect tube M2 are connect with gate driving circuit, the leakage of field-effect tube M1
Pole connects direct current VCC, and the drain electrode of the source electrode and field-effect tube M2 of field-effect tube M1 is connect with one end of inductance L1, field-effect
The source electrode of pipe M2 is grounded, and the other end of inductance L1 and the non-inverting input terminal of amplifier are connect with one end of resistance R1, resistance R1
The other end, amplifier inverting input terminal and reference voltage module connect with the positive terminal of LED light, the negative pole end of LED light
Ground connection.
Compared with the prior art, beneficial effects of the present invention are as follows:
The present invention solves the deficiency of LED light modulation colour temperature stability difference, and can guarantee that the light modulation of outstanding low-light level is special
Property, PWM constant current driving light modulation not only may be implemented, but also simulation constant current driving light modulation may be implemented.
Detailed description of the invention
Fig. 1 is circuit structure diagram of the invention.
Wherein, 1, D/A converter module；2, PWM comparator；3, voltage comparator；4, reference voltage module；5, amplifier,
6, gate driving circuit；7, LED light.
Specific embodiment
In the following, being described further in conjunction with attached drawing and specific embodiment to the present invention:
Referring to Fig. 1, the present invention provides a kind of LED light adjusting circuit device, including MCU, D/A converter module 1, PWM comparator
2, voltage comparator 3, reference voltage module 4, amplifier 5, gate driving circuit 6, rectification module and LED light 7.Digital-to-analogue conversion mould
The input terminal of block 1 and the non-inverting input terminal of PWM comparator 2 are connect with MCU, the output end of PWM comparator 2 and rectification module
Input terminal is connect with gate driving circuit 6, the LED light 7, the non-inverting input terminal of amplifier 5, inverting input terminal and reference electricity
Die block is connect with the output end of rectification module, and the output end of the D/A converter module 1 and the reverse phase of voltage comparator 3 are defeated
Enter end to connect with reference voltage module 4, the non-inverting input terminal of the output end connection voltage comparator 3 of amplifier 5, the voltage ratio
Compared with the inverting input terminal of the output end connection PWM comparator 2 of device 3.The digital pulse signal that D/A converter module 1 exports MCU
Be converted to analog signal.
Specifically, rectification module includes direct current VCC, field-effect tube M1, field-effect tube M2, inductance L1 and resistance R1, institute
The grid of the grid and field-effect tube M2 of stating field-effect tube M1 is connect with gate driving circuit 6, and the drain electrode of field-effect tube M1 connects
Direct current VCC is met, the drain electrode of the source electrode and field-effect tube M2 of field-effect tube M1 is connect with one end of inductance L1, field-effect tube M2
Source electrode ground connection, the other end of inductance L1 and the non-inverting input terminal of amplifier 5 connect with one end of resistance R1, and resistance R1's is another
One end, the inverting input terminal of amplifier 5 and reference voltage module are connect with the positive terminal of LED light 7, the cathode termination of LED light 7
Ground.
Resistance R1 is sampling resistor, and MCU output set of number pulse signal PWM1 controls grid drive to PWM comparator 2
Dynamic circuit 6, while exporting another group of digital pulse signal PWM2 and being converted to analog signal to D/A converter module 1.Amplifier 5 will
Output amplifies voltage V1 to voltage comparator 3 after the voltage at the both ends of resistance R1 amplifies, and reference voltage module 4 obtains digital-to-analogue
Output reference voltage V0 is to voltage comparator 3 after the analog signal of conversion module 1 and the sampled voltage of resistance R1, via voltage
Comparator 3 is compared rear output digit signals PWM3 to PWM comparator 2, and common control gate driving circuit 6 drives field-effect
Pipe M1 conducting and field-effect tube M2 cut-off or driving FET M1 cut-off and field-effect tube M2 conducting.When PWM2 is 1, V1
When less than V0, PWM3 1, the output of PWM comparator 2 is 1, field-effect tube M1 conducting and field-effect tube M2 cut-off；Conversely, when V1 >=
When V0, PWM3 1, the output of PWM comparator 2 is 0, field-effect tube M1 cut-off and field-effect tube M2 conducting；Inductance L1 passes through energy storage
With electric discharge constant-current driving LED lamp, the light modulation of PWM count word or simulation linearity light adjusting are realized.
Simulation is dimmed, the electric current I=Vo/R1 of LED light, when the duty ratio that PWM2 is 1, PWM1 is become by 0 to 100%
Change, reference voltage V0 is as by 0 to Vomax linear change, for LED current I also by 0 to Imax linear change, this is linear for simulation
Light modulation.
PWM count word is dimmed, the electric current I=Vo/R1 of LED light, when PWM1 is fixed value duty ratio, reference voltage V0 is
Fixed value, for the duty ratio of PWM2 by 0 to 100% variation, LED is bright with constant current I or goes out, due to switching frequency height, human eye
It does not see that LED flashes, can only see the variation of LED luminance, this is the light modulation of PWM count word.
It for high-power LED lamp, in high brightness, is dimmed with PWM count word, had not only been able to maintain LED light colour temperature inconvenience, but also energy
It realizes good dimming effect, in low-light level, is dimmed with simulation, linearity light adjusting works well, and the light color temperature of LED light is impacted
Also very little, the advantages of combining PWM and simulate constant current driving.
It will be apparent to those skilled in the art that can make various other according to the above description of the technical scheme and ideas
Corresponding change and deformation, and all these changes and deformation all should belong to the protection scope of the claims in the present invention
Within.
Claims (1)
1.LED light adjusting circuit device, which is characterized in that including MCU, D/A converter module, PWM comparator, voltage comparator, ginseng
Examine voltage module, amplifier, gate driving circuit, rectification module and LED light, the input terminal and PWM of the D/A converter module
The non-inverting input terminal of comparator is connect with MCU, the input terminal of the output end connection gate driving circuit of the PWM comparator,
It is connected with the output end of the input terminal of rectification module and gate driving circuit, the output end of the D/A converter module connects reference
The connection of the output end of the input terminal of voltage module and the inverting input terminal of voltage comparator and reference voltage module, the amplification
The non-inverting input terminal of the output end connection voltage comparator of device, the reverse phase of the output end connection PWM comparator of the voltage comparator
Input terminal；The rectification module includes direct current VCC, field-effect tube M1, field-effect tube M2, inductance L1 and resistance R1, the field
The grid of effect pipe M1 and the grid of field-effect tube M2 are connect with the output end of gate driving circuit, the drain electrode of field-effect tube M1
Direct current VCC is connected, the drain electrode of the source electrode and field-effect tube M2 of field-effect tube M1 is connect with one end of inductance L1, field-effect tube
The source electrode of M2 is grounded, and the other end of inductance L1 and the non-inverting input terminal of amplifier are connect with one end of resistance R1, resistance R1's
The other end, the inverting input terminal of amplifier and reference voltage module are connect with the positive terminal of LED light, the cathode termination of LED light
Ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510571246.9A CN105050298B (en) | 2015-09-09 | 2015-09-09 | LED light adjusting circuit device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510571246.9A CN105050298B (en) | 2015-09-09 | 2015-09-09 | LED light adjusting circuit device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105050298A CN105050298A (en) | 2015-11-11 |
| CN105050298B true CN105050298B (en) | 2019-01-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510571246.9A Active CN105050298B (en) | 2015-09-09 | 2015-09-09 | LED light adjusting circuit device |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109526091B (en) * | 2017-09-20 | 2021-02-19 | 昱京能源科技股份有限公司 | Dimming control system |
| CN108777133A (en) * | 2018-06-26 | 2018-11-09 | 广州视源电子科技股份有限公司 | Dimming circuit, backlight module and liquid crystal display device |
| JP7340383B2 (en) * | 2019-08-09 | 2023-09-07 | ローム株式会社 | dimmer circuit |
| CN111343764A (en) * | 2020-03-05 | 2020-06-26 | 深圳市晟碟半导体有限公司 | LED dimming circuit, device and dimming method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110285311A1 (en) * | 2010-05-18 | 2011-11-24 | Raydium Semiconductor Corporation | Control Circuit and Light Emitting Diode Driver and Method Using Thereof |
| CN202889703U (en) * | 2012-08-23 | 2013-04-17 | 冠捷显示科技（厦门）有限公司 | DC light-modulation type LED drive circuit |
| CN203984748U (en) * | 2014-07-29 | 2014-12-03 | 广东本邦电器有限公司 | LED light fixture Drive and Control Circuit and LED light fixture |
| CN104640303A (en) * | 2013-11-15 | 2015-05-20 | 西安艾力特电子实业有限公司 | Novel stepless light adjustment system of highway tunnel LED lighting street lamp |
-
2015
- 2015-09-09 CN CN201510571246.9A patent/CN105050298B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110285311A1 (en) * | 2010-05-18 | 2011-11-24 | Raydium Semiconductor Corporation | Control Circuit and Light Emitting Diode Driver and Method Using Thereof |
| CN202889703U (en) * | 2012-08-23 | 2013-04-17 | 冠捷显示科技（厦门）有限公司 | DC light-modulation type LED drive circuit |
| CN104640303A (en) * | 2013-11-15 | 2015-05-20 | 西安艾力特电子实业有限公司 | Novel stepless light adjustment system of highway tunnel LED lighting street lamp |
| CN203984748U (en) * | 2014-07-29 | 2014-12-03 | 广东本邦电器有限公司 | LED light fixture Drive and Control Circuit and LED light fixture |
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| Publication number | Publication date |
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| CN105050298A (en) | 2015-11-11 |
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