CN109152132A - A kind of LED multi-path light adjusting circuit - Google Patents
A kind of LED multi-path light adjusting circuit Download PDFInfo
- Publication number
- CN109152132A CN109152132A CN201810932637.2A CN201810932637A CN109152132A CN 109152132 A CN109152132 A CN 109152132A CN 201810932637 A CN201810932637 A CN 201810932637A CN 109152132 A CN109152132 A CN 109152132A
- Authority
- CN
- China
- Prior art keywords
- led
- branch
- connects
- oxide
- semiconductor
- 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.)
- Granted
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
Abstract
The present invention relates to a kind of LED multi-path light adjusting circuits, comprising: dimming control unit, feedback control unit, voltage regulator and LED channel array；Wherein, the first output end of dimming control unit is separately connected the first input end of LED channel array and the first input end of feedback control circuit, the second input terminal of the second output terminal connection LED channel array of adjusting control circuit；The input terminal of the first output end connection voltage regulator of feedback control unit；The third input terminal of the output end connection LED channel array of voltage regulator；Second input terminal of the output end connection feedback control unit of LED channel array.The overshoot current of LED extends the service life of LED light so that the electric current for flowing through LED light string is more stable when the present invention can effectively inhibit to dim metal-oxide-semiconductor conducting, avoids the flashing of LED light.
Description
Technical field
The invention belongs to field of power electronics, and in particular to a kind of LED multi-path light adjusting circuit.
Background technique
In recent years, LED (light emitting diode) is widely answered as green, energy conservation, the luminous product of long-life
With.Compared with traditional lighting source, LED has apparent advantage.LED is substantially a kind of semiconductor diode, has allusion quotation
The PN junction C-V characteristic of type, the i.e. electric current of LED are not as voltage linear changes.It is thus impossible to directly be given with voltage source
LED power supply, needs to control the size of current for flowing through LED.In daily LED illumination application, in different environments,
LED light needs to adjust different brightness, meets different crowd to the different demands of brightness, therefore can flow through LED by adjusting
Average current size adjust the brightness of LED light.
Continuous with LED illumination is popularized, and requirement of the people to LED is also more and more, corresponding tune consequently also occurs
Photosystem, for the characteristic of LED, it is thus proposed that a kind of LED multi-path adjusting control circuit, using computer, MCU module,
Light adjusting circuit and multi-way LED lamp realize the brightness that multi-way LED lamp is controlled to adjust by computer, and which is simple, stablizes.
Somebody proposes a kind of LED drive circuit of Multipath dimming constant current output, permanent using constant pressure source, control circuit, multichannel
Stream source and LED light string realize LED light modulation, and which circuit is realized simply, at low cost, and realize and pass through current constant control
LED light string,
However, can not achieve 0~100% light modulation precision in a kind of this mode of LED multi-path adjusting control circuit,
Dimming scope is limited, and electric current will appear wild effect, and LED light is caused to flash.In a kind of Multipath dimming constant current output
In this mode of LED drive circuit, light modulation precision is limited, cannot fully achieve 0~100% light modulation.
Summary of the invention
In order to solve the above-mentioned problems in the prior art, the present invention provides a kind of LED multi-path light adjusting circuits.This hair
Bright technical problems to be solved are achieved through the following technical solutions:
The embodiment of the invention provides a kind of LED multi-path light adjusting circuits, comprising: dimming control unit, feedback control unit,
Voltage regulator and LED channel array；Wherein,
First output end of dimming control unit is separately connected first input end and the feedback control of the LED channel array
The first input end of circuit processed, the second output terminal of the adjusting control circuit connect the second input of the LED channel array
End, for generating pulse signal, sawtooth signal and control signal；
First output end of the feedback control unit connects the input terminal of the voltage regulator, for according to the saw
Tooth wave signal and control signal output voltage instruction；
The output end of the voltage regulator connects the third input terminal of the LED channel array, for according to the electricity
Pressure instruction output services voltage；
The output end of the LED channel array connects the second input terminal of the feedback control unit, for according to
Pulse signal, the control signal and the operating voltage are turned on and off LED channel array.
In one embodiment of the invention, the dimming control unit includes logic gate subelement, light modulation array and two
A counter；Wherein,
It is connect after described two calculator series connection with the logic gate subelement, the logic gate subelement connects the tune
Optical arrays.
In one embodiment of the invention, the logic gate subelement further includes first port and second port, wherein
The first port is the first output end of the dimming control unit；
The second port connects the second output terminal of the dimming control unit by the light modulation array.
In one embodiment of the invention, the light modulation array includes m item light modulation branch, and every light modulation branch includes electricity
Stream source, metal-oxide-semiconductor, dimming capacitors and comparator, m are the integer greater than 1；Wherein,
The grid of the metal-oxide-semiconductor connects the logical subunit by the second port；
The dimming capacitors are connected between the source electrode and drain electrode of the metal-oxide-semiconductor；
The metal-oxide-semiconductor drain electrode is separately connected the reverse input end of the current source and the comparator；
The metal-oxide-semiconductor source electrode connects ground terminal；
The positive input of the comparator connects variable DC voltage；
The output end of the comparator is the second output terminal of the dimming control unit.
In one embodiment of the invention, the feedback control unit include feedback compensation network, trunk selector and
Trunk comparator；Wherein,
The feedback compensation network connects the trunk selector；
The trunk selector connects the reverse input end of the trunk comparator.
In one embodiment of the invention, the feedback compensation network includes m feedback compensation branch, and every feedback is mended
Repaying branch includes: sampling A/D chip, alternative selector, error amplifier and branch comparator；Wherein,
The first input end of the sampling A/D chip connects the LED channel array；
Second input terminal of the sampling A/D chip connects the second output terminal of the dimming control unit；
The output end of the sampling A/D chip connects the first end of the alternative selector；
The second end of the alternative selector connects the LED channel array；
The output end of the alternative selector connects the reverse input end of the branch error amplifier；
The positive input of the error amplifier connects ground terminal；
The error amplifier output connects the reverse input end of the branch comparator；
The positive input of the branch comparator connects reference voltage.
In one embodiment of the invention, the model AD781 of the sampling A/D chip.
In one embodiment of the invention, the LED channel array includes m LED branch, and every LED branch includes
Branch metal-oxide-semiconductor, LED light string, light modulation metal-oxide-semiconductor, sampling resistor and branch capacitor；Wherein,
The grid of the branch metal-oxide-semiconductor connects the first output end of the dimming control unit；
The drain electrode of the branch metal-oxide-semiconductor connects the output end of the voltage regulator；
The source electrode of the branch metal-oxide-semiconductor connects the anode of the branch LED light string；
The cathode of the LED light string connects the drain electrode of the light modulation metal-oxide-semiconductor；
The branch capacitor is connected between the source electrode and ground terminal end of the light modulation metal-oxide-semiconductor；
The feedback control unit second is connect at the source electrode and the node of the branch capacitance connection of the light modulation metal-oxide-semiconductor
Input terminal；
The second output terminal of the grid connection dimming control unit of the light modulation metal-oxide-semiconductor.
In one embodiment of the invention, the LED light string includes multiple LED light, and the multiple LED light series connection connects
It connects.
In one embodiment of the invention, the resistance value of the sampling resistor is 1 Europe.
Compared with prior art, beneficial effects of the present invention:
(1) overshoot current of LED when can effectively inhibit to dim metal-oxide-semiconductor conducting, so that flowing through the electric current of LED light string more
Add stabilization, extend the service life of LED light, avoids the flashing of LED light.
(2) dimming control unit is adjusted with the square wave control generated after the triangular wave and variable DC voltage comparator generated
Light metal-oxide-semiconductor may be implemented the variation of dim signal from 0~100% duty ratio, improve light modulation precision.
Detailed description of the invention
Fig. 1 is a kind of module connection diagram of LED multi-path light adjusting circuit provided by the invention；
Fig. 2 is a kind of dimming control unit electrical block diagram of LED multi-path light adjusting circuit provided by the invention；
Fig. 3 is a kind of electrical block diagram of LED multi-path light adjusting circuit provided by the invention；
Fig. 4 is a kind of circuit waveform figure of LED multi-path light adjusting circuit provided by the invention.
Specific embodiment
Further detailed description is done to the present invention combined with specific embodiments below, but embodiments of the present invention are not limited to
This.
Embodiment one
Referring to Figure 1, Fig. 2, Fig. 3 and Fig. 4, Fig. 1 are a kind of module connection of LED multi-path light adjusting circuit provided by the invention
Schematic diagram；Fig. 2 is a kind of dimming control unit electrical block diagram of LED multi-path light adjusting circuit provided by the invention；Fig. 3 is
A kind of electrical block diagram of LED multi-path light adjusting circuit provided by the invention；Fig. 4 is a kind of LED multi-path provided by the invention
The circuit waveform figure of light adjusting circuit.
As shown in Figure 1, a kind of LED multi-path light adjusting circuit, comprising: dimming control unit, feedback control unit, voltage are adjusted
Device and LED channel array；Wherein,
Dimming control unit the first output end is separately connected the first input end and feedback control circuit of LED channel array
First input end, the second input terminal of the second output terminal connection LED channel array of adjusting control circuit, for generating pulse letter
Number, sawtooth signal and control signal；
The input terminal of the first output end connection voltage regulator of feedback control unit, for according to sawtooth signal and control
Signal output voltage instruction processed；
The third input terminal of the output end connection LED channel array of voltage regulator, for exporting work according to voltage instruction
Make voltage；
Second input terminal of the output end connection feedback control unit of LED channel array, for according to pulse signal, control
Signal and operating voltage work, that is, are turned on and off LED channel array.
Further, the first output end of dimming control unit and second output terminal include m port, wherein first
Output end includes port A1、A2······Am, second output terminal includes port B1、B2······Bm, wherein m
For the integer greater than 1.
Further, as shown in Fig. 2, dimming control unit includes logic gate subelement, light modulation array and two counters；
Wherein, it is connect after two calculator series connection with logic gate subelement, logic gate subelement connection light modulation array.
Further, logic gate subelement further includes first port and second port, wherein
First port is the first output end of dimming control unit；Including port A1、A2······Am, m be greater than
1 natural number；
Second port connects the second output terminal of dimming control unit by light modulation array, and second port includes port W1、
W2······Wm；
Further, light modulation array includes m item light modulation branch, and every light modulation branch includes current source, metal-oxide-semiconductor, light modulation electricity
Appearance and comparator；Wherein,
The grid of metal-oxide-semiconductor connects first port by port and connects logical subunit；
Dimming capacitors are connected between the source electrode of metal-oxide-semiconductor and drain electrode；
Metal-oxide-semiconductor, which drains, is separately connected the reverse input end of current source and comparator；
Metal-oxide-semiconductor source electrode connects ground terminal；
The positive input of comparator connects variable DC voltage；
The output end of comparator is the second output terminal of dimming control unit.
Specifically, nth light modulation branch includes current source In, metal-oxide-semiconductor Mcn, dimming capacitors CInWith comparator Ecn.Wherein, n
For integer, and 1≤n≤m.
Specifically, it is connect after two counter series connection with logic gate subelement, the port W of logic gate subelement1、
W2······Wm, in nth tune branch, port WnConnect the grid of metal-oxide-semiconductor, dimming capacitors CInIt is connected to metal-oxide-semiconductor
McnSource electrode and drain electrode between, dimming capacitors CInWith metal-oxide-semiconductor McnCurrent source I is separately connected at the node of drain electrode connectionnWith compare
Device EcnReverse input end, dimming capacitors CInGround terminal, variable DC voltage Vn are connected at the node connecting with metal-oxide-semiconductor source electrode
Connect the positive input of comparator, comparator EcnOutput end connectivity port Bn。
Specifically, logic gate subelement passes through port A1、A2······AmOutput pulse signal passes through current source
In, metal-oxide-semiconductor McnWith dimming capacitors CInGenerate sawtooth signal, the sawtooth signal, the reverse input end of input comparator.Pass through
Port B1、B2······BmThe control signal of output control LED channel array, it is preferable that control signal is square wave.
Preferably, the model CD4017B of counter, logic gate subelement pass through or door 74HC32 and with door 74HC08 structure
At current source InModel LM334.
Further, the first input end of feedback control unit includes port C1、C2······CmWith port D1、
D2······Dm, the second input terminal includes port and F1、F2······Fm。
Further, as shown in figure 3, feedback control unit includes that feedback compensation network, trunk selector and trunk compare
Device；Wherein,
Feedback compensation network connects trunk selector；
The reverse input end of trunk selector connection trunk comparator；
The selection end of trunk selection connects the first output end of dimming control unit；
The positive input of trunk comparator inputs triangular signal.
Further, LED multi-path light adjusting circuit according to claim 5, which is characterized in that feedback compensation network includes m
Feedback compensation branch, every feedback compensation branch includes: sampling A/D chip n, alternative selector, error amplifier and branch ratio
Compared with device；Wherein,
The first input end of sampling A/D chip connects LED channel array；
The second output terminal of the second input terminal connection dimming control unit of sampling A/D chip；
The selection end of the second input terminal of sampling A/D chip connection alternative selector；
The first end of the output end connection alternative selector of sampling A/D chip；
The second end of alternative selector connects LED channel array；
The reverse input end of the output end connection branch error amplifier of alternative selector；
The positive input of error amplifier connects ground terminal；
The reverse input end of error amplifier output connection branch comparator；
The positive input of branch comparator connects reference voltage.
Specifically, nth feedback compensation branch includes sampling A/D chip n, alternative selector MUX in feedback compensation networkn、
Error amplifier U1With branch comparator Ebn。
Specifically, in nth feedback compensation branch, the first input end connectivity port F of sampling A/D chip nn, second is defeated
Enter to hold connectivity port Bn, output end connects the alternative selector MUX of this branchnFirst end, alternative selector MUXn
Second end connectivity port Fn, alternative selector MUXnOutput end connect this branch error amplifier UnReversed input
End, error amplifier UnPositive input connect ground terminal, output end connects the branch comparator E of this branchbnIt is anti-
To input terminal, branch comparator EbnPositive input connect reference voltage Vref.
Specifically, trunk selector MUXaIncluding port C1、C2······CmWith port D1、D2······
Dm, port C1、C2······CmTrunk selector MUXaSelection end, the branch comparator E of nth branchbnOutput
End is connected to trunk selector MUXaPort Dn, port CnIt is connected to port An, and pass through port CnInput pulse signal, trunk
Selector MUXaOutput end connect trunk comparator EaPositive input, trunk comparator EaReverse input end input three
Angle wave SAW, wherein triangular wave SAW is generated by chip SG3525, trunk comparator EaOutput end connection voltage regulator
Input terminal.
Preferably, reference voltage VrefnIt is 3.5 volts, the model AD781 of sampling A/D chip n, alternative selector MUXn's
Model ADG819, trunk selector MUXaModel 74HC4051, error amplifier U1With branch comparator EbnModel
It is OP37.
Further, LED channel array includes m LED branch, every LED branch include branch metal-oxide-semiconductor, LED light string,
Dim metal-oxide-semiconductor, sampling resistor and branch capacitor；Wherein,
First output end of the grid connection dimming control unit of branch metal-oxide-semiconductor；
The output end of the drain electrode connection voltage regulator of branch metal-oxide-semiconductor；
The anode of the source electrode connection branch LED light string of branch metal-oxide-semiconductor；
The drain electrode of the cathode connection light modulation metal-oxide-semiconductor of LED light string；
Branch capacitor is connected between the source electrode and ground terminal end of light modulation metal-oxide-semiconductor；
It dims and connect the second input terminal of feedback control unit at the source electrode and the node of branch capacitance connection of metal-oxide-semiconductor；
Dim the second output terminal of the grid connection dimming control unit of metal-oxide-semiconductor.
Specifically, nth LED branch includes branch metal-oxide-semiconductor Man, LED light string, light modulation metal-oxide-semiconductor Mbn, sampling resistor R and branch
Road capacitor Ca, LED light string are multiple LED light series winding composition, it is preferable that the sampling resistor resistance value in every LED branch is identical.
Specifically, in nth LED branch, branch metal-oxide-semiconductor ManGrid connection dimming control unit port An, branch
Road metal-oxide-semiconductor ManDrain electrode connection voltage regulator output end, branch metal-oxide-semiconductor ManSource electrode connect this branch LED light string
Anode, the cathode connection light modulation metal-oxide-semiconductor M of the LED light stringbnDrain electrode, the branch capacitor Ca of this branch is connected on branch metal-oxide-semiconductor
ManBetween source electrode and ground terminal end, metal-oxide-semiconductor M is dimmedbnThe node that is connect with sampling resistor R of source electrode at connect feedback control list
The port F of membern, dim metal-oxide-semiconductor MbnGrid connection dimming control unit port Bn.
Preferably, sampling resistor resistance value is 1 Europe, the model LA_W57B_TYP of LED light, the model of branch metal-oxide-semiconductor
IRF4332 dims the model IRFB4332 of MOS.
Specifically, it is logical to generate control LED after logic gate subelement after two counters series connection of dimming control unit
The branch metal-oxide-semiconductor M of LED branch in channel arrayaPulse signal, pulse signal passes through the port A of the first output endnOutput, passes through
Branch metal-oxide-semiconductor ManGrid input, and to branch metal-oxide-semiconductor ManIt carries out opening or closing control.
Dimming control unit generates control light modulation metal-oxide-semiconductor MbControl signal, pass through port BnOutput extremely light modulation metal-oxide-semiconductor Mbn
Grid, and by the control signal to light modulation metal-oxide-semiconductor MbnIt carries out opening or closing control.
Branch metal-oxide-semiconductor M in m LED branchaIt is connected using time-division multiplex technology, so the output of dimming control unit
Hold port A1······AmIt is being the case where there is no while for virtual values in timing, is dimming metal-oxide-semiconductor MbAlthough can be same
When be connected, but the light modulation metal-oxide-semiconductor and branch metal-oxide-semiconductor of same LED branch in timing be also it is related, that is, work as light modulation
When metal-oxide-semiconductor turns off, branch metal-oxide-semiconductor is also turned off, but when the shutdown of branch metal-oxide-semiconductor, light modulation metal-oxide-semiconductor is not necessarily turned off, theirs leads
Logical initial time is consistent.
The embodiment of the present invention controls the branch metal-oxide-semiconductor and light modulation MOS of each LED branch using dimming control unit respectively
The light modulation of 0~100% duty ratio then may be implemented in the conducting and shutdown of pipe, branch metal-oxide-semiconductor timesharing conducting, light modulation metal-oxide-semiconductor, simultaneously
The output result that can control trunk selector selection each feedback compensation branch is compared with triangular wave VSAW, and control should
The LED current of branch.
The embodiment of the present invention is described further below by citing.
Specifically, working as first output end port A of dimming control unit1When exporting high level, the 1st article of LED branch
Branch metal-oxide-semiconductor Ma1Conducting, capacitor C of the voltage regulator to the 1st article of LED branchaCarry out charge and discharge.The port of dimming control unit
B1When exporting high level, the light modulation metal-oxide-semiconductor M of first LED branchb1Conducting, and first LED branch is flowed through into LED string
Electric current is recorded as I1.The port B of second input terminal connection of sampling A/D chip 11When output is high level, 1 pair of sampling A/D chip sampling
The voltage of resistance R is sampled, alternative selector MUX1Select the output voltage of sampling resistor R as output, as port B1It is defeated
Out be low level when, sampling A/D chip 1 keep before sample as a result, alternative selector MUX1Select the result of sampling A/D chip 1
As output, alternative selector MUX1The signal of output passes through error amplifier U1After amplification, it is input to comparator Eb1It is anti-
Phase input terminal is compared with the reference voltage Vref of its non-inverting input terminal, and A at this time1For high level, then select first it is anti-
The output of feedback compensation branch is as trunk selector MUXaOutput, be input to trunk comparator EaInverting input terminal, with trunk
Comparator EaThe input triangular wave VSAW of normal phase input end be compared, pass through trunk comparator E more afterwardsaOutput feedback control
Signal processed, feedback control signal are input to voltage regulator, control voltage regulator output services voltage to LED array.
Similarly, when other ports of first output end of dimming control unit export high level, with this working principle
Identical, details are not described herein again.
Specifically, as n=3, as shown in figure 4, port A1、A2、A3Output be impulse wave, in comparator Ec1, comparator
Ec2, comparator Ec3One end, corresponding input triangular wave SAW1、SAW2、SAW3, in comparator Ec2, comparator Ec3The other end pair
Variable DC voltage V should be inputted1、V2、V3, after comparison, corresponding comparator is through output port B1、B2、B3Output be square wave.
Specifically, logic gate subelement passes through port A1、A2······AmOutput pulse signal passes through current source
In, metal-oxide-semiconductor McnWith dimming capacitors CInThe signal for generating input comparator is triangular wave SAWn.Pass through port B1、
B2······BmThe control signal of output control LED channel array, it is preferable that control signal is square wave.
The embodiment of the present invention controls the branch metal-oxide-semiconductor and light modulation MOS of each LED branch using dimming control unit respectively
The light modulation of 0~100% duty ratio then may be implemented in the conducting and shutdown of pipe, branch metal-oxide-semiconductor timesharing conducting, light modulation metal-oxide-semiconductor, simultaneously
The output result that can control trunk selector selection each feedback compensation branch is compared with triangular wave SAW, and control should
The LED current of branch.
Voltage sample on sampling resistor is kept electricity by the sampling A/D chip in the feedback compensation branch of the embodiment of the present invention
Press it is constant, light modulation metal-oxide-semiconductor conducting when, alternative selector select the voltage on sampling resistor as export, opened in light modulation
When shutdown, the voltage on sampling resistor is zero, and alternative selector selects the holding voltage in sampling A/D chip as defeated
Out.Therefore, the output of alternative selector is almost a constant value, can effectively inhibit to dim metal-oxide-semiconductor conducting in this way
When LED overshoot current extend the service life of LED light so that the electric current for flowing through LED light string is more stable, avoid LED light
Flashing.Meanwhile the square wave control light modulation MOS generated after the triangular wave and variable voltage comparator of dimming control unit generation
Pipe, may be implemented the variation of dim signal from 0~100% duty ratio, improves light modulation precision.
The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be said that
Specific implementation of the invention is only limited to these instructions.For those of ordinary skill in the art to which the present invention belongs, exist
Under the premise of not departing from present inventive concept, a number of simple deductions or replacements can also be made, all shall be regarded as belonging to of the invention
Protection scope.
Claims (10)
1. a kind of LED multi-path light adjusting circuit characterized by comprising dimming control unit, feedback control unit, voltage are adjusted
Device and LED channel array；Wherein,
First output end of dimming control unit is separately connected the first input end and feedback control electricity of the LED channel array
The first input end on road, the second output terminal of the adjusting control circuit connect the second input terminal of the LED channel array, use
In generation pulse signal, sawtooth signal and control signal；
First output end of the feedback control unit connects the input terminal of the voltage regulator, for according to the sawtooth wave
Signal and control signal output voltage instruction；
The output end of the voltage regulator connects the third input terminal of the LED channel array, for being referred to according to the voltage
Enable output services voltage；
The output end of the LED channel array connects the second input terminal of the feedback control unit, for according to the pulse
Signal, the control signal and the operating voltage are turned on and off LED channel array.
2. LED multi-path light adjusting circuit according to claim 1, which is characterized in that the dimming control unit includes logic
Door subelement, light modulation array and two counters；Wherein,
It is connect after described two calculator series connection with the logic gate subelement, the logic gate subelement connects the light modulation battle array
Column.
3. LED multi-path light adjusting circuit according to claim 2, which is characterized in that the logic gate subelement further includes
Single port and second port, wherein
The first port is the first output end of the dimming control unit；
The second port connects the second output terminal of the dimming control unit by the light modulation array.
4. LED multi-path light adjusting circuit according to claim 3, which is characterized in that the light modulation array includes m item light modulation branch
Road, every light modulation branch include current source, metal-oxide-semiconductor, dimming capacitors and comparator, and m is the integer greater than 1；Wherein,
The grid of the metal-oxide-semiconductor connects the logical subunit by the second port；
The dimming capacitors are connected between the source electrode and drain electrode of the metal-oxide-semiconductor；
The metal-oxide-semiconductor drain electrode is separately connected the reverse input end of the current source and the comparator；
The metal-oxide-semiconductor source electrode connects ground terminal；
The positive input of the comparator connects variable DC voltage；
The output end of the comparator is the second output terminal of the dimming control unit.
5. LED multi-path light adjusting circuit according to claim 4, which is characterized in that the feedback control unit includes feedback
Compensation network, trunk selector and trunk comparator；Wherein,
The feedback compensation network connects the trunk selector；
The trunk selector connects the reverse input end of the trunk comparator.
6. LED multi-path light adjusting circuit according to claim 5, which is characterized in that the feedback compensation network includes that m item is anti-
Feedback compensation branch, every feedback compensation branch includes: sampling A/D chip, alternative selector, error amplifier and branch comparator；
Wherein,
The first input end of the sampling A/D chip connects the LED channel array；
Second input terminal of the sampling A/D chip connects the second output terminal of the dimming control unit；
The output end of the sampling A/D chip connects the first end of the alternative selector；
The second end of the alternative selector connects the LED channel array；
The output end of the alternative selector connects the reverse input end of the branch error amplifier；
The positive input of the error amplifier connects ground terminal；
The error amplifier output connects the reverse input end of the branch comparator；
The positive input of the branch comparator connects reference voltage.
7. LED multi-path light adjusting circuit according to claim 6, which is characterized in that the model of the sampling A/D chip
AD781。
8. LED multi-path light adjusting circuit according to claim 1, which is characterized in that the LED channel array includes m LED
Branch, every LED branch include branch metal-oxide-semiconductor, LED light string, light modulation metal-oxide-semiconductor, sampling resistor and branch capacitor；Wherein,
The grid of the branch metal-oxide-semiconductor connects the first output end of the dimming control unit；
The drain electrode of the branch metal-oxide-semiconductor connects the output end of the voltage regulator；
The source electrode of the branch metal-oxide-semiconductor connects the anode of the branch LED light string；
The cathode of the LED light string connects the drain electrode of the light modulation metal-oxide-semiconductor；
The branch capacitor is connected between the source electrode and ground terminal end of the light modulation metal-oxide-semiconductor；
The feedback control unit second is connect at the source electrode and the node of the branch capacitance connection of the light modulation metal-oxide-semiconductor to input
End；
The second output terminal of the grid connection dimming control unit of the light modulation metal-oxide-semiconductor.
9. LED multi-path light adjusting circuit according to claim 8, which is characterized in that the LED light string includes multiple LED light,
The multiple LED light is connected in series.
10. LED multi-path light adjusting circuit according to claim 8, which is characterized in that the resistance value of the sampling resistor is 1 Europe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810932637.2A CN109152132B (en) | 2018-08-16 | 2018-08-16 | A kind of LED multi-path light adjusting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810932637.2A CN109152132B (en) | 2018-08-16 | 2018-08-16 | A kind of LED multi-path light adjusting circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109152132A true CN109152132A (en) | 2019-01-04 |
| CN109152132B CN109152132B (en) | 2019-12-03 |
Family
ID=64789474
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810932637.2A Active CN109152132B (en) | 2018-08-16 | 2018-08-16 | A kind of LED multi-path light adjusting circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109152132B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110691445A (en) * | 2019-09-05 | 2020-01-14 | 西安电子科技大学 | Multi-path high-power LED drive circuit |
| CN111163549A (en) * | 2020-02-28 | 2020-05-15 | 深圳市晟碟半导体有限公司 | Time-sharing multiplexing LED dimming device, circuit and dimming method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100194299A1 (en) * | 2009-02-05 | 2010-08-05 | Ye Byoung-Dae | Method of driving a light source, light source apparatus for performing the method, and display apparatus having the light source apparatus |
| CN103037597A (en) * | 2013-01-06 | 2013-04-10 | 深圳创维－Rgb电子有限公司 | Multi-channel LED (Light Emitting Diode) constant current control circuit and LED light source control system |
| CN103137080A (en) * | 2013-03-14 | 2013-06-05 | 深圳市华星光电技术有限公司 | Light-emitting dioxide (LED) backlight drive circuit, liquid crystal display device and driving method |
| KR20150005758A (en) * | 2013-07-04 | 2015-01-15 | 성균관대학교산학협력단 | Led driving apparatus capable of adjusting switching duty ratio for multi-channel led application |
| CN105934029A (en) * | 2016-05-30 | 2016-09-07 | 西安电子科技大学 | Multi-path LED constant current drive circuit |
-
2018
- 2018-08-16 CN CN201810932637.2A patent/CN109152132B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100194299A1 (en) * | 2009-02-05 | 2010-08-05 | Ye Byoung-Dae | Method of driving a light source, light source apparatus for performing the method, and display apparatus having the light source apparatus |
| CN103037597A (en) * | 2013-01-06 | 2013-04-10 | 深圳创维－Rgb电子有限公司 | Multi-channel LED (Light Emitting Diode) constant current control circuit and LED light source control system |
| CN103137080A (en) * | 2013-03-14 | 2013-06-05 | 深圳市华星光电技术有限公司 | Light-emitting dioxide (LED) backlight drive circuit, liquid crystal display device and driving method |
| KR20150005758A (en) * | 2013-07-04 | 2015-01-15 | 성균관대학교산학협력단 | Led driving apparatus capable of adjusting switching duty ratio for multi-channel led application |
| CN105934029A (en) * | 2016-05-30 | 2016-09-07 | 西安电子科技大学 | Multi-path LED constant current drive circuit |
Non-Patent Citations (1)
| Title |
|---|
| LUCHEN YU等: "High efficiency multi-channel LED driver based on SIMO switch-mode converter", 《2012 INTERNATIONAL SOC DESIGN CONFERENCE》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110691445A (en) * | 2019-09-05 | 2020-01-14 | 西安电子科技大学 | Multi-path high-power LED drive circuit |
| CN110691445B (en) * | 2019-09-05 | 2021-09-14 | 西安电子科技大学 | Multi-path high-power LED drive circuit |
| CN111163549A (en) * | 2020-02-28 | 2020-05-15 | 深圳市晟碟半导体有限公司 | Time-sharing multiplexing LED dimming device, circuit and dimming method thereof |
| CN111163549B (en) * | 2020-02-28 | 2023-09-22 | 深圳市晟碟半导体有限公司 | Time-division multiplexing LED dimming device, circuit and dimming method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109152132B (en) | 2019-12-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101868090B (en) | Circuit for dimming or speed regulation control and control method | |
| CN103503563B (en) | Dimmable LED driver and control method thereof | |
| CN106455227B (en) | A kind of LED linear constant-current control circuit and LED light emission device | |
| WO2017067143A1 (en) | Automatic mode-switching full voltage segmented linear constant current led drive circuit | |
| CN106455216B (en) | A kind of thyristor regulating Optimizing Control System for LED luminance regulation | |
| CN103037597B (en) | Multi-channel LED (Light Emitting Diode) constant current control circuit and LED light source control system | |
| CN103648202B (en) | Active power factor correction control circuit, chip and LED (Light Emitting Diode) drive circuit | |
| CN208094847U (en) | A kind of efficient low ripple dimming LED drive circuit | |
| CN104703358B (en) | Wide-voltage-range LED (light emitting diode) lamp switching and dimming driving circuit and LED lamp dimming control system | |
| CN103874296B (en) | The constant current driver circuit for LED of multichannel self-adapting load | |
| CN201797622U (en) | Circuit for dimming or speed regulation control | |
| CN110446308A (en) | For controlling control circuit, driving circuit, LED lamp system and the control method of power transistor | |
| CN109152132B (en) | A kind of LED multi-path light adjusting circuit | |
| CN202799281U (en) | Control device for small LED strings | |
| CN102685989A (en) | PWM (Pulse-Width modulation) dimming method and circuit of LED constant-current source concentratively powered by high-voltage direct current | |
| CN210093619U (en) | Four-channel AC LED driving chip circuit with fine dimming function | |
| CN102014537B (en) | Drive circuit of LED lamp | |
| CN202759647U (en) | LED control circuit having high power factor and LED lighting device | |
| CN106954307B (en) | A kind of PWM light adjusting circuits for High Power Factor primary side feedback LED drive power | |
| CN211481551U (en) | LED power of mixing of colors temperature can adjust luminance | |
| CN203151813U (en) | LED light source drive circuit | |
| CN110267401A (en) | The LED control method and system of self feed back | |
| CN203884027U (en) | LED constant current driving circuit for multipath adaptive load | |
| CN105530728A (en) | Bus-current synchronous time-sharing multiplexing multi-channel constant current output LED driver topology and control method therefor | |
| CN214125566U (en) | LED dimming circuit, LED driving system and electronic equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |