CN107995751A - A kind of LED drive circuit - Google Patents
A kind of LED drive circuit Download PDFInfo
- Publication number
- CN107995751A CN107995751A CN201810006040.5A CN201810006040A CN107995751A CN 107995751 A CN107995751 A CN 107995751A CN 201810006040 A CN201810006040 A CN 201810006040A CN 107995751 A CN107995751 A CN 107995751A
- Authority
- CN
- China
- Prior art keywords
- led
- module
- drive circuit
- colour temperature
- microcontroller
- 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
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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]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
-
- 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
-
- 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]
- H05B45/20—Controlling the colour of the light
Abstract
The invention discloses a kind of LED drive circuit, including：Sampling module, for gathering the information of voltage of input signal IN；Rectification module, for carrying out rectification to input signal IN, is converted to DC voltage and is supplied to subsequent conditioning circuit；Microcontroller, for exporting different control signals under the output control of the sampling module and rectification module to change the colour temperature of LED module and brightness；Drive module, corresponding electric current is provided for the high/low colour temperature LED under the control according to microcontroller to LED module；LED module, including multiple high/low colour temperature LED light, different-colour and the light of brightness are sent with the change with input signal IN under the control of the drive module, by the present invention, it can be achieved that adjusting colour temperature at the same time and adjusting the dual-use function of brightness.
Description
Technical field
The present invention relates to a kind of LED drive circuit, is driven more particularly to a kind of LED that can adjust colour temperature and brightness at the same time
Circuit.
Background technology
In recent years, high-brightness LED illumination with specular removal, the long-life, high reliability and it is pollution-free the advantages that progressively take
For conventional light sources such as incandescent lamp, fluorescent lamps.LED illumination has specular removal, long-life, ring as a kind of new illuminations
The advantages that guarantor, therefore also it is applied to various lighting areas more and more widely, in some applications, it may be desirable in some cases may be used
The brightness of light is adjusted, so as to the comfortable illumination of further energy saving and offer.At present, LED light regulating technologies are more and more ripe, LED
Dimming mode be divided into direct current light modulation and PWM dims two kinds, since PWM light modulations have photochromic inconvenience, during low-light level stability compared with
The advantages that good, therefore widely used by those skilled in the art.
As high-tech development and the continuous improvement of living standards of the people, people it is also proposed the lighting system of household
New requirement, wherein, most common one side is, for LE lighting systems, not only to want that the lighting hours of light can be controlled now,
And the adjusting change of corresponding lamplight scene, brightness, colour temperature etc. is made, especially for some special occasions environment, no
The brightness to LED lamp is only needed to be adjusted, it is also necessary to be adjusted to the colour temperature of LED lamp, and to use more intelligence
Can be with convenient control mode.
Colour temperature is the scale for representing that light source is photochromic, and unit is K (Kelvin).Colour temperature is in the field such as photography, video, publication tool
There is important application.The colour temperature of light source is by contrasting its color and theoretical hot dark matter radiator come definite.Hot dark matter spoke
The kelvin degree when color of beam and light source matches is exactly the colour temperature of that light source, it is directly radiated with Planck blackbody
Law is associated.The office illumination lamp used at present is substantially based on cool white dichromatism.And colour temperature is fixed after lamp installation, i.e.,
Colour temperature can not be changed.And people easily causes eye fatigue under cool white colour temperature environment for a long time, and work efficiency is low
However, the driving adjusting circuit of existing LED light generally can not all accomplish the modulation to colour temperature, using upper in the presence of scarce
Fall into.
The content of the invention
To overcome above-mentioned the shortcomings of the prior art, the purpose of the present invention is to provide a kind of LED drive circuit, with reality
Colour temperature is now adjusted at the same time and adjusts the dual-use function of brightness.
In view of the above and other objects, the present invention proposes a kind of LED drive circuit, including：
Sampling module, for gathering the information of voltage of input signal IN；
Rectification module, for carrying out rectification to input signal IN, is converted to DC voltage and is supplied to subsequent conditioning circuit；
Microcontroller, for exporting different control signals under the output control of the sampling module and rectification module to change
Become colour temperature and the brightness of LED module；
Drive module, corresponding electricity is provided for the high/low colour temperature LED under the control according to microcontroller to LED module
Stream；
LED module, including multiple high/low colour temperature LED light, with the control of the drive module with input signal IN
Change send the light of different-colour and brightness.
Further, the input signal IN is voltage signal or pulse width modulating signal.
Further, the rectification module includes rectification rectifier diode D1 and the first filter capacitor C1, for that will be arteries and veins
The input signal IN for rushing bandwidth modulation signals carries out rectification and is converted to DC voltage and is supplied to subsequent conditioning circuit.
Further, the LED drive circuit further includes regulator circuit, and the regulator circuit is used for through the defeated of over commutation
Enter signal and be converted to steady dc voltage so that the microcontroller steady operation.
Further, the anode of the rectifier diode D1 connects the input signal IN, and cathode is connected to described first
One end of filter capacity C1 and the regulator circuit, the first filter capacity C1 minus earths.
Further, the regulator circuit includes current-limiting resistance R3, zener diode D2 and the second filter capacitor C2, described
The cathode of one end connection rectifier diode D1 of current-limiting resistance R3, the cathode of the other end connection zener diode D2,
One end of second filter capacitor C2 and the supply voltage anode of microcontroller U1, the anode of the zener diode D2 and the second filter
The other end ground connection of ripple capacitance C2.
Further, the drive module includes high color temperature drive circuit and low colour temperature drive circuit, and the high color temperature drives
The high color temperature LED that dynamic circuit is used for the LED module under the control of the microcontroller provides current path, the low color
The low colour temperature LED that warm drive circuit is used for the LED module under the control of the microcontroller provides stabling current.
Further, the high color temperature drive circuit includes NPN triode Q1, the first output terminal of the microcontroller U1
The base stage of the NPN triode Q1 is connected to, the collector of the NPN triode Q1 connects the high color temperature LED of the LED module
Cathode, emitter ground connection.
Further, the low colour temperature drive circuit is a constant-current circuit, and the second output terminal of the microcontroller U1 connects
The control terminal of the constant-current circuit is connected to, the output terminal of the constant-current circuit connects the low colour temperature LED cathode of the LED module.
Further, when input signal IN is low, the microcontroller U1 controls the low colour temperature LED of the LED module permanent
Flow point is bright, and high color temperature LED does not work；When input signal IN is high, the microcontroller U1 is controlled by the NPN triode Q1
High color temperature LED is gradually lighted, while low colour temperature LED keeps constant current work.
Compared with prior art, a kind of LED drive circuit of the present invention is by detecting input voltage value or PWM (pulse widths
Modulation) duty cycle, carry out the export ratio of control circuit, so that colour temperature and colour temperature during high brightness during the LED drive circuit low-light level
Difference, realizes by adjusting the purpose of colour temperature and brightness with power supply all the way and signal.
Brief description of the drawings
Fig. 1 is a kind of circuit structure diagram of LED drive circuit of the present invention.
Embodiment
Below by way of specific instantiation and embodiments of the present invention are described with reference to the drawings, those skilled in the art can
Understand the further advantage and effect of the present invention easily by content disclosed in the present specification.The present invention can also pass through other differences
Instantiation implemented or applied, the various details in this specification also can be based on different viewpoints with application, without departing substantially from
Various modifications and change are carried out under the spirit of the present invention.
Fig. 1 is a kind of circuit structure diagram of LED drive circuit of the present invention.A kind of as shown in Figure 1, LED drivings electricity of the present invention
Road, by detecting input voltage value or PWM (pulse width modulation) duty cycle, carrys out the export ratio of control circuit, so that low bright
Colour temperature is different when colour temperature and high brightness when spending, and specifically includes：Sampling module 10, rectification module 20, Voltage stabilizing module 30, microcontroller
40th, drive module 50 and LED module 60.
Wherein, sampling module 10, including first resistor R1 and second resistance R2 compositions, for gathering the electricity of input signal IN
Press information；Rectification module 20, including rectifier diode D1 and the first filter capacitor C1, for input signal IN to be converted to direct current
Voltage supply subsequent conditioning circuit (Voltage stabilizing module 30, microcontroller 40, drive module 50 and LED module 60) uses, and needs to illustrate here
, in the specific embodiment of the invention, the input signal IN can be voltage signal or PWM (pulse width modulation) letters
Number, when for pwm signal when, then rectification is given by rectification module 20；Voltage stabilizing module 30, including current-limiting resistance R3, two pole of voltage stabilizing
Pipe D2 and the second filter capacitor C2, for the input signal through over commutation to be converted to steady dc voltage so that microcontroller
40 steady operations；Microcontroller 40 is made of MCU and its peripheral components, for the output in sampling module 10 and Voltage stabilizing module 30
Control is lower to export different control signals to change the colour temperature of LED module 60 and brightness；Drive module 50, including high color temperature driving electricity
Road and low colour temperature drive circuit, NPN triode Q1 composition high color temperature drive circuit, for giving height under the control of microcontroller 40
Colour temperature LED provides current path, and constant-current circuit (IC) U2 forms low colour temperature drive circuit, under the control of microcontroller 40
Stabling current is provided to low colour temperature LED；LED module 60 is by high color temperature LED groups (being illustrated as LED1, LED2, LED3) and low colour temperature
LED groups (being illustrated as LED4, LED5, LED6) form, under the control of drive module 50 with the change of input signal IN
Send different-colour and the light of brightness.
Specifically, input signal IN is connected to one end of first resistor R1 and the anode of rectifier diode D1, first resistor
The other end of R1 is connected with one end of second resistance R2 and is connected to the input signal control terminal of microcontroller U1, rectifier diode
The cathode of D1 is connected to the anode of one end of the first filter capacity C1, one end of current-limiting resistance R3, the anode of LED1 and LED4,
The other end of current-limiting resistance R3 is connected to the cathode of zener diode D2, one end of the second filter capacitor C2 and microcontroller U1's
Supply voltage anode, the anode of the cathode connection LED2 of LED1, the anode of the cathode connection LED3 of LED2, the cathode connection of LED3
To the collector of NPN triode Q1, the first output terminal of microcontroller U1 is connected to the base stage of NPN triode Q1, microcontroller
The second output terminal of U1 is connected to the control terminal of constant-current circuit U2, the anode of the cathode connection LED5 of LED4, and the cathode of LED5 connects
The anode of LED6 is connect, the cathode of LED6 is connected to the output terminal of constant-current circuit U2, the other end, the first wave filter of second resistance R2
The other end of capacitance C1, the other end of the second filter capacitor C2, the supply voltage negative terminal of microcontroller U1, NPN triode Q1
The supply voltage negativing ending grounding of emitter and constant-current circuit U2.That is, the present invention is only inputted with signal all the way to realize two
Kind control function.Circuit has a LED (LED1, LED2, LED3) of high color temperature and the LED (LED4, LED5, LED6) of low colour temperature, and two
The LED of kind colour temperature is arranged together mixed luminescence.Low colour temperature LED limits what is passed through by low current constant-current circuit (constant current IC) U2
Electric current, high color temperature LED are driven by NPN triode Q1, and constant-current circuit (constant current IC) U2 and NPN triode Q1 pass through microcontroller U1
To control, microcontroller U1 gathers the signal of input by resistance R1/R2, and when signal is low-light level, microcontroller U1 is controlled
Low colour temperature LED constant current is lighted, and high color temperature LED does not work；When signal is high brightness, microcontroller U1 is controlled by NPN triode Q1
High color temperature LED is gradually lighted, while low colour temperature LED keeps constant current work, two kinds of colour temperature LED mixed brightness increases, colour temperature
Rise, reaches by adjusting the function of colour temperature and brightness with power supply all the way and signal, current-limiting resistance R3 and zener diode D2,
Second filter capacitor C2 forms regulator circuit, is powered to microcontroller U1.
Specifically, in the present invention, the signal of circuit input can be voltage signal or PWM (pulse width modulation) letters
Number, its operation principle is as follows：
When circuit input signal is voltage, control process is as follows：
First stage：Input voltage can be raised by 0V, when voltage is less than the threshold value of low colour temperature LED series voltages
When, circuit does not work.
Second stage：Voltage gradually rises, and low colour temperature LED, which flows through electric current, gradually to be increased, and brightness increases therewith, microcontroller
U1 detects input voltage signal, and control high color temperature LED does not work, and the effect of output is low colour temperature LED luminance with input voltage liter
It is high and raise.
Phase III：When voltage is increased to the operation threshold of constant current IC (U2), low colour temperature LED luminance is not further added by, and is protected
Hold constant luminance, while microcontroller U1 output signal controls Q1 is begun to turn on, the brightness of high color temperature LED with input voltage liter
It is high and gradually increase, and the low colour temperature LED effects exported after mixing that shine all gradually are increasing for brightness and colour temperature.
Fourth stage：When input voltage is increased to the peak of circuit work, high color temperature LED and low colour temperature LED are protected
Constant luminance is held, is high-high brightness and highest colour temperature after the mixing that shines.
When circuit input signal inputs for PWM (pulse width modulation)：Diode (D1) passes through pwm signal rectification
It is whole circuit power supply after capacitance C1 filtering.Resistance R1R2 will be inputted after the sampling of pwm signal duty cycle to microcontroller U1, by U1
The four-stage that control circuit is adjusted according to voltage equally works.
Here it should be noted that, the series connection number of LED can adjust in the LED drive circuit of the present invention, can also go here and there more
Parallel connection, is not limited to the quantity of diagram.
In conclusion a kind of LED drive circuit of the present invention is accounted for by detecting input voltage value or PWM (pulse width modulation)
Empty ratio, carrys out the export ratio of control circuit, so that colour temperature is different with colour temperature during high brightness during the LED drive circuit low-light level, it is real
Show by adjusting the purpose of colour temperature and brightness with power supply all the way and signal.
Any those skilled in the art can repair above-described embodiment under the spirit and scope without prejudice to the present invention
Decorations and change.Therefore, the scope of the present invention, should be as listed by claims.
Claims (10)
1. a kind of LED drive circuit, including：
Sampling module, for gathering the information of voltage of input signal IN；
Rectification module, for carrying out rectification to input signal IN, is converted to DC voltage and is supplied to subsequent conditioning circuit；
Microcontroller, for exporting different control signals under the output control of the sampling module and rectification module to change
The colour temperature of LED module and brightness；
Drive module, corresponding electric current is provided for the high/low colour temperature LED under the control according to microcontroller to LED module；
LED module, including multiple high/low colour temperature LED light, with the control of the drive module with the change of input signal IN
Change the light for sending different-colour and brightness.
A kind of 2. LED drive circuit as claimed in claim 1, it is characterised in that：The input signal IN for voltage signal or
Pulse width modulating signal.
A kind of 3. LED drive circuit as claimed in claim 2, it is characterised in that：The rectification module includes rectification rectification two
Pole pipe D1 and the first filter capacitor C1, direct current is converted to for will carry out rectification for the input signal IN of pulse width modulating signal
Voltage is supplied to subsequent conditioning circuit.
A kind of 4. LED drive circuit as claimed in claim 3, it is characterised in that：The LED drive circuit further includes voltage stabilizing electricity
Road, the regulator circuit are used to the input signal through over commutation being converted to steady dc voltage so that the microcontroller is steady
Fixed work.
A kind of 5. LED drive circuit as claimed in claim 4, it is characterised in that：The anode connection of the rectifier diode D1
The input signal IN, cathode are connected to one end of the first filter capacity C1 and the regulator circuit, and described first
Filter capacity C1 minus earths.
A kind of 6. LED drive circuit as claimed in claim 5, it is characterised in that：The regulator circuit include current-limiting resistance R3,
One end of zener diode D2 and the second filter capacitor C2, the current-limiting resistance R3 connect the cathode of the rectifier diode D1,
The other end is connecting the supply voltage of the cathode of the zener diode D2, one end of the second filter capacitor C2 and microcontroller U1 just
The other end of end, the anode of the zener diode D2 and the second filter capacitor C2 are grounded.
A kind of 7. LED drive circuit as claimed in claim 1, it is characterised in that：The drive module drives including high color temperature
Circuit and low colour temperature drive circuit, the high color temperature drive circuit are used to give the LED moulds under the control of the microcontroller
The high color temperature LED of block provides current path, and the low colour temperature drive circuit is used under the control of the microcontroller to described
The low colour temperature LED of LED module provides stabling current.
A kind of 8. LED drive circuit as claimed in claim 7, it is characterised in that：The high color temperature drive circuit includes NPN tri-
The first output terminal of pole pipe Q1, the microcontroller U1 are connected to the base stage of the NPN triode Q1, the NPN triode Q1
Collector connect the high color temperature LED cathode of the LED module, emitter ground connection.
A kind of 9. LED drive circuit as claimed in claim 7, it is characterised in that：The low colour temperature drive circuit is a constant current
Circuit, the second output terminal of the microcontroller U1 are connected to the control terminal of the constant-current circuit, the output of the constant-current circuit
End connects the low colour temperature LED cathode of the LED module.
A kind of 10. LED drive circuit as claimed in claim 9, it is characterised in that：The micro-control when input signal IN is low
Device U1 processed controls the low colour temperature LED constant current of the LED module to light, and high color temperature LED does not work；Described in when input signal IN is high
Microcontroller U1 controls high color temperature LED gradually to light by the NPN triode Q1, while low colour temperature LED keeps constant electric current
Work.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810006040.5A CN107995751A (en) | 2018-01-03 | 2018-01-03 | A kind of LED drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810006040.5A CN107995751A (en) | 2018-01-03 | 2018-01-03 | A kind of LED drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107995751A true CN107995751A (en) | 2018-05-04 |
Family
ID=62040800
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810006040.5A Pending CN107995751A (en) | 2018-01-03 | 2018-01-03 | A kind of LED drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107995751A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109348583A (en) * | 2018-11-30 | 2019-02-15 | 宁波亚茂光电股份有限公司 | A kind of intelligent lamp |
| CN110493930A (en) * | 2019-09-19 | 2019-11-22 | 广州市莱帝亚照明股份有限公司 | A kind of control device and control method of LED light |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4749912B2 (en) * | 2006-03-29 | 2011-08-17 | 株式会社フジクラ | lighting equipment |
| CN204244510U (en) * | 2014-09-15 | 2015-04-01 | 马士科技有限公司 | A kind of emission control device and use the luminescent system of this emission control device |
| CN204513147U (en) * | 2015-04-17 | 2015-07-29 | 李伟 | LED jewelry, the decorative lamp of tunable optical toning |
| CN204829358U (en) * | 2015-07-01 | 2015-12-02 | 深圳市立基傲鹏光电有限公司 | Ball bubble lamp of adjusting luminance that possesses mixing of colors function |
-
2018
- 2018-01-03 CN CN201810006040.5A patent/CN107995751A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4749912B2 (en) * | 2006-03-29 | 2011-08-17 | 株式会社フジクラ | lighting equipment |
| CN204244510U (en) * | 2014-09-15 | 2015-04-01 | 马士科技有限公司 | A kind of emission control device and use the luminescent system of this emission control device |
| CN204513147U (en) * | 2015-04-17 | 2015-07-29 | 李伟 | LED jewelry, the decorative lamp of tunable optical toning |
| CN204829358U (en) * | 2015-07-01 | 2015-12-02 | 深圳市立基傲鹏光电有限公司 | Ball bubble lamp of adjusting luminance that possesses mixing of colors function |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109348583A (en) * | 2018-11-30 | 2019-02-15 | 宁波亚茂光电股份有限公司 | A kind of intelligent lamp |
| CN109348583B (en) * | 2018-11-30 | 2024-03-15 | 宁波亚茂光电股份有限公司 | Intelligent lamp |
| CN110493930A (en) * | 2019-09-19 | 2019-11-22 | 广州市莱帝亚照明股份有限公司 | A kind of control device and control method of LED light |
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| PB01 | Publication | ||
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180504 |
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