CN107318197A - A kind of LED multi-path current balance circuit - Google Patents
A kind of LED multi-path current balance circuit Download PDFInfo
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- CN107318197A CN107318197A CN201710709557.6A CN201710709557A CN107318197A CN 107318197 A CN107318197 A CN 107318197A CN 201710709557 A CN201710709557 A CN 201710709557A CN 107318197 A CN107318197 A CN 107318197A
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- 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]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Abstract
The invention discloses a kind of LED multi-path current balance circuit, including converting unit, constant-current control unit, LED voltage detection unit and LED open-circuit conditions output voltage holding/feedback unit, the electric connection constant-current control unit of converting unit, constant-current control unit is electrically connected with LED voltage detection unit, and LED voltage detection unit is electrically connected with LED open-circuit conditions output voltage holding/feedback unit.The LED multi-path current balance circuit, realize the mode of multiple-channel output electric current constant current and the mode of current balance type, real-time and appropriate adjustment can be made to different LED strip voltage, to make each string LED current all accurately be adjusted to design desired size.
Description
Technical field
The present invention relates to LED drive power technical field, specially a kind of LED multi-path current balance circuit.
Background technology
LED is a kind of semiconductor subassembly, typically in the LED peddled on the market, has been manufacturer according to wavelength or brightness etc.
After characteristic sifting sort.Rate of change of the current changing rate much larger than forward conducting voltage when being turned on due to LED, so surveying
When trying its characteristic and classification, a load current value (such as 20mA) is mostly based on, then provide the change model of forward conducting voltage
Enclose.Such purpose, seeks to obtain desired brightness requirement, under identical driving current, obtains every LEDs brightness, color
The uniformity of degree.And to ensure assembly reliability, driving LED electric current have to be lower than the requirement of LED rated values.Meanwhile, when
The rated current that ambient temperature is allowed when being lifted can be reduced.As can be seen here, when being backlight with LED, it is necessary to be driven to it
Move under fixed current, to avoid driving current from exceeding maximum rating, influence its reliability.Because LED is in itself with precipitous
C-V characteristic, add the discreteness of LED characteristics, and the characteristics of luminescence caused by temperature change is offset, it is necessary to using constant current
Control mode.Simultaneously in order to keep the uniformity that each parallel connection LED string is luminous, the stream of each parallel connection LED string turns into research LED drivings
The key issue of power supply.
The content of the invention
It is an object of the invention to provide a kind of LED multi-path current balance circuit, solve to mention in above-mentioned background technology
The problem of.
To achieve the above object, the present invention provides following technical scheme：
A kind of LED multi-path current balance circuit, including converting unit, constant-current control unit, LED voltage detection unit and
LED open-circuit conditions output voltage holding/feedback unit, the electric connection constant-current control unit of converting unit, constant-current control unit
LED voltage detection unit is electrically connected with, LED voltage detection unit is electrically connected with LED open-circuit conditions output voltage holding/feedback
Member.
It is preferred that, the converting unit includes rectifier bridge BD2, transformer XFMR1, IGCT Q2 and pwm chip IC；
The ac input end of the rectifier bridge BD2 is connected on input power Vin1, and rectifier bridge BD2 direct current output termination electric capacity C14 connects
Ground, and transformer XFMR1 the interface of winding 0；Series resistance R102 and two poles between the winding 0 and 1 of the transformer XFMR1
Pipe D18, transformer XFMR1 winding 1 is also connected with IGCT Q2 source electrode, and IGCT Q2 grid is connected to WM control chips
IC, IGCT Q2 drain series resistance Re ground connection；The series diode D12 of winding 2 and inductance of the transformer XFMR1
Lout1 is connected on output voltage Vout, the transformer XFMR1 series capacitance C12 of winding 3 ground connection.
It is preferred that, the constant-current control unit is by the first current constant control part, the second current constant control part and the 3rd constant current
Control section is constituted.
It is preferred that, wherein the first current constant control part includes amplifier U7A, IGCT M3, light emitting diode D6, luminous two
Pole pipe D7, light emitting diode D8, light emitting diode D9 and light emitting diode D10；The positive pole of the amplifier U7A connects power supply V5's
One end, power supply V5 other end ground connection；Amplifier U7A output end series resistance R12 is connected to IGCT M3 grid, IGCT
M3 source series resistance R13 ground connection and series resistance R14 are connected to amplifier U7A negative pole, and amplifier U7A negative pole also connects
Meet electric capacity C8 and resistance R15 is connected to amplifier U7A output end；Drain series light emitting diode D6, the hair of the IGCT M3
Optical diode D7, light emitting diode D8, light emitting diode D9 and light emitting diode D10 are connected on output voltage Vout.
It is preferred that, wherein the second current constant control part include amplifier U10A, it is IGCT M4, light emitting diode D19, luminous
Diode D20, light emitting diode D21, light emitting diode D22 and light emitting diode D23；The positive pole of the amplifier U10A connects electricity
Source V6 one end, power supply V6 other end ground connection；Amplifier U10A output end series resistance R23 is connected to IGCT M4 grid
Pole, IGCT M4 source series resistance R24 ground connection and series resistance R25 are connected to amplifier U10A negative pole, amplifier
U10A negative pole is also connected with electric capacity C15 and resistance R26 is connected to amplifier U10A output end；The drain series of the IGCT M4
Light emitting diode D19, light emitting diode D20, light emitting diode D21, light emitting diode D22 and light emitting diode D23 are connected to defeated
Go out on voltage Vout.
It is preferred that, wherein the 3rd current constant control part include amplifier U10B, it is IGCT M5, light emitting diode D24, luminous
Diode D25, light emitting diode D26, light emitting diode D27 and light emitting diode D28；The positive pole of the amplifier U10B connects electricity
Source V7 one end, power supply V7 other end ground connection；Amplifier U10B output end series resistance R27 is connected to IGCT M5 grid
Pole, IGCT M5 source series resistance R28 ground connection and series resistance R29 are connected to amplifier U10B negative pole, amplifier
U10B negative pole is also connected with electric capacity C16 and resistance R30 is connected to amplifier U10B output end；The drain series of the IGCT M5
Light emitting diode D24, light emitting diode D25, light emitting diode D26, light emitting diode D27 and light emitting diode D28 are connected to defeated
Go out on voltage Vout.
It is preferred that, the LED voltage detection unit includes amplifier U8A, diode D16, diode D29, diode D30
With diode D31, amplifier U8A negative pole connects resistance R19 and resistance R20 one end, resistance R20 other end ground connection；Electricity
Resistance R19 other end series diode D29 is connected to the IGCT M3 of the first current constant control part drain electrode, series diode D30
It is connected to the brilliant lock that the IGCT M4 of the second current constant control part drain electrode, series diode D31 are connected to the 3rd current constant control part
Pipe M5 drain electrode；The output end series diode D16 of the amplifier U8A is connected to LED open-circuit conditions output voltage holding/feedback
On unit and amplifier U8A output end series capacitance C13 and resistance R22 is connected to amplifier U8A negative pole.
It is preferred that, the LED open-circuit conditions output voltage holding/feedback unit includes amplifier U7B, photoelectrical coupler U9
With diode D17；Amplifier U7B negative pole connects resistance R17 and resistance R18 one end, and the another of resistance R17 terminates to output
On voltage Vout.Resistance R18 other end ground connection；Amplifier U7B output end series diode D17 is connected to photoelectrical coupler U9
Negative pole, electric coupler U9 cathode series resistance R21 is connected on output voltage Vout, coupler U9 grounded emitter；Institute
The output end series capacitance C9 and resistance R16 for stating amplifier U7B are connected to amplifier U7B negative pole.
Compared with prior art, beneficial effects of the present invention are as follows：
1st, this LED multi-path current balance circuit, realizes the mode of multiple-channel output electric current constant current and the mode of current balance type, can
To make real-time and appropriate adjustment to different LED strip voltage, to make each string LED current be all accurately adjusted to
Desired size is designed, even if there are certain string LED open circuits, the electric current of other LED strips is not interfered with yet；And use up loss
It is possible low；The open loop state being likely to occur simultaneously for LED strip, is also suitable for.
Brief description of the drawings
Fig. 1 is single channel tandem type high voltage and constant current drive circuit figure of the present invention；
Fig. 2 is single channel tandem type high voltage and constant current drive circuit V-I curve maps of the present invention；
Fig. 3 determines voltage and series resistance constant-current drive circuit figure for the present invention；
Fig. 4 determines voltage and series resistance constant-current drive circuit V-I curve maps for the present invention；
Fig. 5 is total current constant-current drive circuit figure of the present invention；
Fig. 6 is total current constant-current drive circuit V-I curve maps of the present invention；
Fig. 7 is integrated form constant-current drive circuit figure of the present invention；
Fig. 8 is integrated form constant-current drive circuit V-I curve maps of the present invention；
Fig. 9 is multichannel independence low pressure low current constant-current drive circuit figure of the present invention；
Figure 10 is integrated circuit schematic diagram of the present invention；
Figure 11 is conversion unit circuit schematic diagram of the present invention；
Figure 12 is constant-current control unit circuit theory diagrams of the present invention；
Figure 13 is the first current constant control partial circuit schematic diagram of the invention；
Figure 14 is the second current constant control partial circuit schematic diagram of the invention；
Figure 15 is the 3rd current constant control partial circuit schematic diagram of the invention；
Figure 16 is LED voltage detection cell circuit schematic diagram of the present invention；
Figure 17 is LED open-circuit conditions output voltage holding/feedback unit circuit theory diagrams of the present invention.
In figure：1 converting unit, 2 constant-current control units, 21 first current constant control parts, 22 second current constant control parts, 23
3rd current constant control part, 3 LED voltage detection units, 4 LED open-circuit conditions output voltage holdings/feedback unit.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
In existing LED power driving circuit, Fig. 1-2 is referred to, is single channel tandem type high voltage and constant current drive circuit side
Case, its electric circuit characteristic：All LED strips are unified into a string, therefore can ensure that the electric currents of every LEDs is all consistent；But LED
The quantity of series connection is more, therefore output voltage is higher；Bigger the problem of is, when wherein a LEDs are opened a way, to cause whole
Individual LED string does not work.
Fig. 3-4 are referred to, to determine the LED power drive circuit of voltage+series resistance current constant mode, it is illustrated that middle circuit is with surely
Potential source coordinates steady resistance to control LED electric current, and the advantage of this structure is to select the leeway of voltage source very big, adjuster with
A connection end point is only needed between LED；Have the disadvantage it is less efficient, what this loss for being mainly steady resistance was caused, in addition, it
Control to LED forward currents is not very accurate.V-I test curves can be seen that 6 difference LED curent change scope is：
14.2mA to 18.4mA, the LED mean flow rates provided by vendor A are higher than manufacturer B, and operating current is higher by 2mA.
Fig. 5-6 are referred to, are the LED power drive circuit of total current constant current+plus steady resistance, its electric circuit characteristic：Diagram
Circuit be used to adjust LED total current, steady resistance is used to realize the matching between each LED.This circuit is same in driving
Preferable effect can be obtained during same a batch of product that manufacturer provides.The condition of same current is being provided with foregoing circuit
Under, steady resistance can be reduced, make lower power consumption half.V-I curves give the change model of six different LED drive currents
Enclose：15.4mA to 19.6mA, the LED current change provided by vendor A is smaller, and the LED from vendor A and manufacturer B is averaged
Control electric current is identical：17.5mA.The defect of this structure is that steady resistance power consumption is still larger, moreover, the matching of each LED current
Property is not fine.But the compromise ease for considering performance and circuit of this circuit.
Refer to Fig. 7-8, be the LED power drive circuit of integrated form current constant control mode, it is illustrated that in can adjust each respectively
LED electric current, without steady resistance.Electric current degree of regulation and matching degree depend on each independent current regulator.V-I curves
Show that all 6 tested White LED electric currents are held in stable electric current.This circuit can provide higher performance and refer to
Mark；But it is due to that the acceptable LED output voltages of the program and/or electric current are relatively low, therefore is more common in small size (small-power) LED
Driving application.
Referring to Fig. 9, being multichannel independence low pressure low current constant-current drive circuit, LED V-I curves and the collection of this driving
Accepted way of doing sth current constant control mode is identical, and electric current degree of regulation and matching degree are fine.This circuit can provide higher performance indications；
But it is due to that program topology is complicated, therefore cost highest.
To solve the defect of foregoing circuit, this practicality realizes multiple-channel output electric current using the current balance circuit of multi-string LED
The mode of constant current and the mode of multiple-channel output current balance type.
Referring to Fig. 10, a kind of LED multi-path current balance circuit, including converting unit 1, constant-current control unit 2, LED electricity
Press detection unit 3 and LED open-circuit conditions output voltage holding/feedback unit 4, the electric connection current constant control list of converting unit 1
Member 2, constant-current control unit 2 is electrically connected with LED voltage detection unit 3, and LED voltage detection unit 3 is electrically connected with LED open-circuit conditions
Output voltage holding/feedback unit 4.
Figure 11 is referred to, converting unit 1 includes rectifier bridge BD2, transformer XFMR1, IGCT Q2 and pwm chip
IC；Rectifier bridge BD2 ac input end is connected on input power Vin1, and rectifier bridge BD2 direct current output termination electric capacity C14 connects
Ground, and transformer XFMR1 the interface of winding 0；Series resistance R102 and diode between transformer XFMR1 winding 0 and 1
D18, transformer XFMR1 winding 1 is also connected with IGCT Q2 source electrode, and IGCT Q2 grid is connected to WM control chip IC,
IGCT Q2 drain series resistance Re ground connection；The transformer XFMR1 series diode D12 of winding 2 and inductance Lout1 is connected to defeated
Go out on voltage Vout, the transformer XFMR1 series capacitance C12 of winding 3 ground connection.
Figure 12-15 are referred to, constant-current control unit 2 is by the first current constant control part 21, the and of the second current constant control part 22
3rd current constant control part 23 is constituted.
Wherein the first current constant control part 21 includes amplifier U7A, IGCT M3, light emitting diode D6, light emitting diode
D7, light emitting diode D8, light emitting diode D9 and light emitting diode D10；Amplifier U7A positive pole connects power supply V5 one end, electricity
Source V5 other end ground connection；Amplifier U7A output end series resistance R12 is connected to IGCT M3 grid, IGCT M3 source
Pole series resistance R13 ground connection and series resistance R14 are connected to amplifier U7A negative pole, and amplifier U7A negative pole is also connected with electric capacity
C8 and resistance R15 are connected to amplifier U7A output end；IGCT M3 drain series light emitting diode D6, light emitting diode D7,
Light emitting diode D8, light emitting diode D9 and light emitting diode D10 are connected on output voltage Vout.
Wherein the second current constant control part 22 includes amplifier U10A, IGCT M4, light emitting diode D19, light-emitting diodes
Pipe D20, light emitting diode D21, light emitting diode D22 and light emitting diode D23；Amplifier U10A positive pole meets the one of power supply V6
End, power supply V6 other end ground connection；Amplifier U10A output end series resistance R23 is connected to IGCT M4 grid, IGCT
M4 source series resistance R24 ground connection and series resistance R25 are connected to amplifier U10A negative pole, and amplifier U10A negative pole is also
Connection electric capacity C15 and resistance R26 is connected to amplifier U10A output end；IGCT M4 drain series light emitting diode D19, hair
Optical diode D20, light emitting diode D21, light emitting diode D22 and light emitting diode D23 are connected on output voltage Vout.
3rd current constant control part 23 includes amplifier U10B, IGCT M5, light emitting diode D24, light emitting diode
D25, light emitting diode D26, light emitting diode D27 and light emitting diode D28；Amplifier U10B positive pole meets the one of power supply V7
End, power supply V7 other end ground connection；Amplifier U10B output end series resistance R27 is connected to IGCT M5 grid, IGCT
M5 source series resistance R28 ground connection and series resistance R29 are connected to amplifier U10B negative pole, and amplifier U10B negative pole is also
Connection electric capacity C16 and resistance R30 is connected to amplifier U10B output end；IGCT M5 drain series light emitting diode D24, hair
Optical diode D25, light emitting diode D26, light emitting diode D27 and light emitting diode D28 are connected on output voltage Vout.
Its operation principle is：The in-phase input end of operational amplifier is set to reference voltage, and inverting input is to flow through
LED actual current passes through the voltage that resistance is produced, and from negative-feedback principle, flows through LED actual current=Vref ÷ Re；
The device for performing adjustment LED current is operated in linear state for transistor in transistor, then secondary circuit.
Figure 16 is referred to, LED voltage detection unit 3 includes amplifier U8A, diode D16, diode D29, diode
D30 and diode D31, amplifier U8A negative pole connect resistance R19 and resistance R20 one end, resistance R20 other end ground connection；
Resistance R19 other end series diode D29 is connected to the IGCT M3 of the first current constant control part 21 drain electrode, series diode
D30 is connected to the IGCT M4 of the second current constant control part 22 drain electrode, series diode D31 and is connected to the 3rd current constant control part 23
IGCT M5 drain electrode；Amplifier U8A output end series diode D16 be connected to LED open-circuit conditions output voltage keep/it is anti-
On feedback unit 4 and amplifier U8A output end series capacitance C13 and resistance R22 is connected to amplifier U8A negative pole.
Due to LED particle Vf dispersiveness, each LED (diode D16, diode D29, diode D30 and diode are caused
D31 the driving voltage required for) crossfire crosses same current is different；If driving voltage is too high, then current constant control portion
Dividing the loss of transistor just becomes very high, the problem of the problem of causing temperature rise and efficiency are reduced；If driving voltage is too low,
So obviously the electric current of some LED strips will be reduced, or even can not light LED；Therefore need to provide LED strip one suitably
Magnitude of voltage；Its operation principle is：Voltage signal on transistor drain/colelctor electrode from each LED strip is converged by diode
Collect the inverting input of operational amplifier, same to characteristic, therefore the anti-phase input of operational amplifier are unidirectionally led due to diode
The voltage signal at end is the maximum of the voltage signal on transistor drain/colelctor electrode that LED respectively goes here and there；The signal is put by computing
Preceding pole adjuster can be also directly output to photo-coupler by being exported after the negative-feedback of big device, to form electrical equipment isolated form closed loop control
System.
Figure 17 is referred to, LED open-circuit conditions output voltage holding/feedback unit 4 includes amplifier U7B, photoelectrical coupler
U9 and diode D17；Amplifier U7B negative pole connects resistance R17 and resistance R18 one end, resistance R17 it is another terminate to it is defeated
Go out on voltage Vout.Resistance R18 other end ground connection；Amplifier U7B output end series diode D17 is connected to photoelectrical coupler
U9 negative pole, electric coupler U9 cathode series resistance R21 is connected on output voltage Vout, coupler U9 grounded emitter；
Amplifier U7B output end series capacitance C9 and resistance R16 are connected to amplifier U7B negative pole.
Its operation principle is：When LED, which respectively goes here and there, all to open a way, because LED voltage detection part can't detect LED strip
Voltage signal, the situation of this similar open loop, at this moment the output voltage of adjustment period/converter can be generally electric always toward rising
Pressure can rise to/or it is enough to puncture the level of circuit；To avoid the appearance of this " open loop phenomenon ", LED open-circuit conditions are added defeated
Go out voltage holding/feedback fraction circuit；Output voltage of the anti-phase end signal from converter of operational amplifier, the signal and fortune
The reference signal for calculating the in-phase end of amplifier is made comparisons, and makees to drive photo-coupler (can also be directly output to after negative-feedback computing
Preceding pole adjuster), to control the level of output voltage.
Although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of changes, modification can be carried out to these embodiments, replace without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (8)
1. a kind of LED multi-path current balance circuit, it is characterised in that：Including converting unit (1), constant-current control unit (2), LED
Voltage detection unit (3) and LED open-circuit conditions output voltage holding/feedback unit (4), the electric connection of converting unit (1) are permanent
Flow control unit (2), constant-current control unit (2) is electrically connected with LED voltage detection unit (3), LED voltage detection unit (3) electricity
Property connection LED open-circuit conditions output voltage holding/feedback unit (4).
2. a kind of LED multi-path current balance circuit according to claim 1, it is characterised in that：Converting unit (1) bag
Include rectifier bridge BD2, transformer XFMR1, IGCT Q2 and pwm chip IC；The ac input end of the rectifier bridge BD2 is connected to
On input power Vin1, rectifier bridge BD2 direct current output termination electric capacity C14 ground connection, and transformer XFMR1 the interface of winding 0；
Series resistance R102 and diode D18 between the winding 0 and 1 of the transformer XFMR1, transformer XFMR1 winding 1 is also connected with
IGCT Q2 source electrode, IGCT Q2 grid is connected to WM control chip IC, IGCT Q2 drain series resistance Re ground connection；
The series diode D12 of winding 2 and inductance Lout1 of the transformer XFMR1 is connected on output voltage Vout, transformer XFMR1
The series capacitance C12 of winding 3 ground connection.
3. a kind of LED multi-path current balance circuit according to claim 1, it is characterised in that：The constant-current control unit
(2) it is made up of the first current constant control part (21), the second current constant control part (22) and the 3rd current constant control part (23).
4. a kind of LED multi-path current balance circuit according to claim 3, it is characterised in that：Wherein the first current constant control
Partly (21) include amplifier U7A, IGCT M3, light emitting diode D6, light emitting diode D7, light emitting diode D8, luminous two
Pole pipe D9 and light emitting diode D10；The positive pole of the amplifier U7A connects power supply V5 one end, power supply V5 other end ground connection；Put
Big device U7A output end series resistance R12 is connected to IGCT M3 grid, IGCT M3 source series resistance R13 be grounded with
And series resistance R14 is connected to amplifier U7A negative pole, amplifier U7A negative pole is also connected with electric capacity C8 and resistance R15 is connected to amplification
Device U7A output end；Drain series light emitting diode D6, light emitting diode D7, light emitting diode D8, the hair of the IGCT M3
Optical diode D9 and light emitting diode D10 are connected on output voltage Vout.
5. a kind of LED multi-path current balance circuit according to claim 3, it is characterised in that：Wherein the second current constant control
Partly (22) include amplifier U10A, IGCT M4, light emitting diode D19, light emitting diode D20, light emitting diode D21, hair
Optical diode D22 and light emitting diode D23；The positive pole of the amplifier U10A connects power supply V6 one end, the power supply V6 other end
Ground connection；Amplifier U10A output end series resistance R23 is connected to IGCT M4 grid, IGCT M4 source series resistance
R24 ground connection and series resistance R25 are connected to amplifier U10A negative pole, and amplifier U10A negative pole is also connected with electric capacity C15 and electricity
Resistance R26 is connected to amplifier U10A output end；Drain series light emitting diode D19, the light emitting diode of the IGCT M4
D20, light emitting diode D21, light emitting diode D22 and light emitting diode D23 are connected on output voltage Vout.
6. a kind of LED multi-path current balance circuit according to claim 3, it is characterised in that：Wherein the 3rd current constant control
Partly (23) include amplifier U10B, IGCT M5, light emitting diode D24, light emitting diode D25, light emitting diode D26, hair
Optical diode D27 and light emitting diode D28；The positive pole of the amplifier U10B connects power supply V7 one end, the power supply V7 other end
Ground connection；Amplifier U10B output end series resistance R27 is connected to IGCT M5 grid, IGCT M5 source series resistance
R28 ground connection and series resistance R29 are connected to amplifier U10B negative pole, and amplifier U10B negative pole is also connected with electric capacity C16 and electricity
Resistance R30 is connected to amplifier U10B output end；Drain series light emitting diode D24, the light emitting diode of the IGCT M5
D25, light emitting diode D26, light emitting diode D27 and light emitting diode D28 are connected on output voltage Vout.
7. a kind of LED multi-path current balance circuit according to claim 1, it is characterised in that：The LED voltage detection is single
First (3) include amplifier U8A, diode D16, diode D29, diode D30 and diode D31, and amplifier U8A negative pole connects
Connecting resistance R19 and resistance R20 one end, resistance R20 other end ground connection；Resistance R19 other end series diode D29 is connected to
The IGCT M3 of first current constant control part (21) drain electrode, series diode D30 are connected to the second current constant control part (22)
IGCT M4 drain electrode, series diode D31 are connected to the IGCT M5 of the 3rd current constant control part (23) drain electrode；The amplification
Device U8A output end series diode D16 is connected on LED open-circuit conditions output voltage holding/feedback unit (4) and amplifier
U8A output end series capacitance C13 and resistance R22 are connected to amplifier U8A negative pole.
8. a kind of LED multi-path current balance circuit according to claim 1, it is characterised in that：The LED open-circuit conditions are defeated
Going out voltage holding/feedback unit (4) includes amplifier U7B, photoelectrical coupler U9 and diode D17；Amplifier U7B negative pole connects
Connecting resistance R17 and resistance R18 one end, the another of resistance R17 are terminated on output voltage Vout.Resistance R18 another termination
Ground；Amplifier U7B output end series diode D17 is connected to photoelectrical coupler U9 negative pole, electric coupler U9 positive pole series connection
Resistance R21 is connected on output voltage Vout, coupler U9 grounded emitter；The output end series capacitance of the amplifier U7B
C9 and resistance R16 are connected to amplifier U7B negative pole.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710709557.6A CN107318197A (en) | 2017-08-17 | 2017-08-17 | A kind of LED multi-path current balance circuit |
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| CN201710709557.6A CN107318197A (en) | 2017-08-17 | 2017-08-17 | A kind of LED multi-path current balance circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110099474A (en) * | 2018-01-30 | 2019-08-06 | 帝奥微电子有限公司 | LED multi-channel parallel driving circuit |
| CN112286270A (en) * | 2020-09-16 | 2021-01-29 | 深圳市崧盛电子股份有限公司 | Multi-output automatic current-equalizing circuit and driving power supply |
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