CN205726567U - A kind of multiple-channel output constant-current circuit - Google Patents
A kind of multiple-channel output constant-current circuit Download PDFInfo
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- CN205726567U CN205726567U CN201620552201.7U CN201620552201U CN205726567U CN 205726567 U CN205726567 U CN 205726567U CN 201620552201 U CN201620552201 U CN 201620552201U CN 205726567 U CN205726567 U CN 205726567U
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Abstract
The utility model discloses a kind of multiple-channel output constant-current circuit, including LLC control circuit, switching circuit, isolated variable circuit, current rectifying and wave filtering circuit, isolation feedback circuit, current/voltage control circuit；Current rectifying and wave filtering circuit includes the first output loop, the second output loop, the 3rd output loop, the 4th output loop.This utility model output loop is all to have been driven by same switching circuit, so all of output loop operating frequency is identical, the output electric current that the thin-film capacitor that precision is higher the most only need to be selected can to realize each loop as current-sharing electric capacity is consistent.Therefore only the electric current in one of them loop need to carry out inspection ensures that other output loop electric currents are consistent.Even if opening a way in one of them loop, the electric current also not resulting in other loops rises.
Description
Technical field
This utility model relates to LED drive circuit, is specifically related to a kind of multiple-channel output constant-current circuit.
Background technology
The advantages such as current LED illumination collection low-power consumption, long-life, the most very popular.Along with the continuous decline of price,
LED has started to be applied in domestic lighting.36,60 LED that market is sold at present, power consumption only about 3w, brightness
Be equivalent to 10w electric filament lamp, very power saving.After using a period of time, find that light decay ratio is more serious.Its circuit is very simple, adopts
Be all capacity voltage dropping circuit.Although capacitance decompression belongs to constant current source, but is equivalent to short circuit, electric current at booting moment electric capacity
Change is very big, and when line voltage is widely varied, curent change is the biggest.Reason is that the electric current of wide variation result in
The light decay of LED.And current LED circuit is when existing due to great power LED power supply plurality of LEDs parallel connection, in parallel is the most, more appearance
Easily cause the problem that the situation that often string current error is the biggest occurs.
Summary of the invention
This utility model is for the problems referred to above, it is provided that a kind of multiple-channel output constant-current circuit, including LLC control circuit, switching
Circuit, isolated variable circuit, current rectifying and wave filtering circuit, isolation feedback circuit, current/voltage control circuit；Current rectifying and wave filtering circuit includes
First output loop, the second output loop, the 3rd output loop, the 4th output loop；Described LLC control circuit controls end and connects
Switching circuit；Described switching circuit outfan connects isolated variable circuit；Described isolated variable circuit output end connects rectification filter
Wave circuit；Described isolation feedback circuit input connects control circuit, and outfan connects current/voltage control circuit；Described electric current
Voltage control circuit connects the 4th output loop of current rectifying and wave filtering circuit；Described first output loop, the second output loop, the 3rd
Output loop, the outfan of the 4th output loop connect LED respectively.
Further, described switching circuit includes NMOS tube Q1, Q2；Described Q1 drain electrode connects DC400V, and source electrode connects Q2
Drain electrode, grid connects LLC control circuit；Described Q2 source electrode connects ground, and grid connects LLC control circuit.
Further, described isolated variable circuit includes inductance L2, electric capacity C5, transformator T1；Described L2 connects T1；Institute
Stating C5 one end and connect Q2 source electrode, the other end connects T1.
Further, described first output loop includes diode D1, D2, D3, D4, electric capacity C1, C2, CE1, described D1
Positive pole connects D2 negative pole, C1 respectively；Described D1 negative pole connects D4 negative pole, CE1 positive pole, LED respectively；Described CE1 negative pole connects ground；
Described D2 positive pole connects D3 positive pole ground connection respectively；Described D3 negative pole connects D4 positive pole and C2 respectively；
Described second output loop includes diode D5, D6, D7, D8, electric capacity C3, C4, CE2, and described D5 positive pole connects respectively
Meet D6 negative pole, C1；Described D5 negative pole connects D8 negative pole, CE2 positive pole, LED respectively；Described CE2 negative pole connects ground；Described D6 positive pole
Connect D7 positive pole ground connection respectively；Described D7 negative pole connects D8 positive pole and C4 respectively；
Described 3rd output loop includes diode D9, D10, D11, D12, electric capacity C6, C7, CE3, and described D9 positive pole is respectively
Connect D10 negative pole, C6；Described D9 negative pole connects D12 negative pole, CE3 positive pole, LED respectively；Described CE3 negative pole connects ground；Described
D10 positive pole connects D11 positive pole ground connection respectively；Described D11 negative pole connects D12 positive pole and C7 respectively；
Described 4th output loop includes diode D13, D14, D15, D16, electric capacity C8, C9, CE4, and described D9 positive pole divides
Lian Jie D14 negative pole, C6；Described D9 negative pole connects D16 negative pole, CE4 positive pole, LED respectively；Described CE4 negative pole connects resistance
RES1 ground connection；Described D14 positive pole connects D15 positive pole ground connection respectively；Described D15 negative pole connects D16 positive pole and C9 respectively.
Further, described C1, C2, C3, C4, C6, C7, C8, C9 are current-sharing electric capacity.
Further, described isolation feedback circuit is optocoupler U1A.
Further, described CE1, CE2, CE3, CE4 are respectively the filter capacitor of current rectifying and wave filtering circuit output loop.
Advantage of the present utility model:
This utility model output loop is all to have been driven by same switching circuit, so the work of all of output loop
Frequency is identical, and the thin-film capacitor that precision is higher the most only need to be selected as current-sharing electric capacity can to realize the output electric current in each loop
Unanimously.Therefore only the electric current in one of them loop need to carry out inspection ensures that other output loop electric currents are consistent.Even if its
In loop open circuit, the electric current also not resulting in other loops rises.Circuit conversion efficiency of the present utility model is high, is designed to
This is low, and reliability is high, can well avoid the situation that every road current error is bigger to occur.
In addition to objects, features and advantages described above, this utility model also has other purpose, feature and excellent
Point.Below with reference to figure, this utility model is described in further detail.
Accompanying drawing explanation
The accompanying drawing of the part constituting the application is used for providing being further appreciated by of the present utility model, of the present utility model
Schematic description and description is used for explaining this utility model, is not intended that improper restriction of the present utility model.
Fig. 1 is a kind of multiple-channel output constant-current circuit schematic diagram of this utility model embodiment.
Detailed description of the invention
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with accompanying drawing and enforcement
Example, is further elaborated to this utility model.Should be appreciated that specific embodiment described herein is only in order to explain this
Utility model, is not used to limit this utility model.
What LLC referred to is half-bridge resonance translation circuit.
With reference to Fig. 1, a kind of multiple-channel output constant-current circuit as shown in Figure 1, including LLC control circuit, switching circuit, isolation
Translation circuit, current rectifying and wave filtering circuit, isolation feedback circuit, current/voltage control circuit；Current rectifying and wave filtering circuit includes the first output
Loop, the second output loop, the 3rd output loop, the 4th output loop；Described LLC control circuit controls end and connects switching electricity
Road；Described switching circuit outfan connects isolated variable circuit；Described isolated variable circuit output end connects current rectifying and wave filtering circuit；
Described isolation feedback circuit input connects control circuit, and outfan connects current/voltage control circuit；Described current/voltage control
Circuit processed connects the 4th output loop of current rectifying and wave filtering circuit；Described first output loop, the second output loop, the 3rd export back
Road, the outfan of the 4th output loop connect LED respectively.
Described switching circuit includes NMOS tube Q1, Q2；Described Q1 drain electrode connects DC400V, and source electrode connects Q2 drain electrode, grid
Connect LLC control circuit；Described Q2 source electrode connects ground, and grid connects LLC control circuit.
Described isolated variable circuit includes inductance L2, electric capacity C5, transformator T1；Described L2 connects T1；Described C5 one end is even
Connecing Q2 source electrode, the other end connects T1.
Described first output loop includes diode D1, D2, D3, D4, electric capacity C1, C2, CE1, and described D1 positive pole connects respectively
Meet D2 negative pole, C1；Described D1 negative pole connects D4 negative pole, CE1 positive pole, LED respectively；Described CE1 negative pole connects ground；Described D2 positive pole
Connect D3 positive pole ground connection respectively；Described D3 negative pole connects D4 positive pole and C2 respectively；
Described second output loop includes diode D5, D6, D7, D8, electric capacity C3, C4, CE2, and described D5 positive pole connects respectively
Meet D6 negative pole, C1；Described D5 negative pole connects D8 negative pole, CE2 positive pole, LED respectively；Described CE2 negative pole connects ground；Described D6 positive pole
Connect D7 positive pole ground connection respectively；Described D7 negative pole connects D8 positive pole and C4 respectively；
Described 3rd output loop includes diode D9, D10, D11, D12, electric capacity C6, C7, CE3, and described D9 positive pole is respectively
Connect D10 negative pole, C6；Described D9 negative pole connects D12 negative pole, CE3 positive pole, LED respectively；Described CE3 negative pole connects ground；Described
D10 positive pole connects D11 positive pole ground connection respectively；Described D11 negative pole connects D12 positive pole and C7 respectively；
Described 4th output loop includes diode D13, D14, D15, D16, electric capacity C8, C9, CE4, and described D9 positive pole divides
Lian Jie D14 negative pole, C6；Described D9 negative pole connects D16 negative pole, CE4 positive pole, LED respectively；Described CE4 negative pole connects resistance
RES1 ground connection；Described D14 positive pole connects D15 positive pole ground connection respectively；Described D15 negative pole connects D16 positive pole and C9 respectively.
Described C1, C2, C3, C4, C6, C7, C8, C9 are current-sharing electric capacity.
Described isolation feedback circuit is optocoupler U1A.
Described CE1, CE2, CE3, CE4 are respectively the filter capacitor of current rectifying and wave filtering circuit output loop.
Circuit of the present utility model output way does not limits, and every road fan-out capability is less than 60W.
This utility model output loop is all to have been driven by same switching circuit, so the work of all of output loop
Frequency is identical, and the thin-film capacitor that precision is higher the most only need to be selected as current-sharing electric capacity can to realize the output electric current in each loop
Unanimously.Therefore only the electric current in one of them loop need to carry out inspection ensures that other output loop electric currents are consistent.Even if its
In loop open circuit, the electric current also not resulting in other loops rises.Circuit conversion efficiency of the present utility model is high, is designed to
This is low, and reliability is high, can well avoid the situation that every road current error is bigger to occur.
The foregoing is only preferred embodiment of the present utility model, not in order to limit this utility model, all in this practicality
Within novel spirit and principle, any modification, equivalent substitution and improvement etc. made, should be included in guarantor of the present utility model
Within the scope of protecting.
Claims (7)
1. a multiple-channel output constant-current circuit, it is characterised in that include LLC control circuit, switching circuit, isolated variable circuit,
Current rectifying and wave filtering circuit, isolation feedback circuit, current/voltage control circuit；Current rectifying and wave filtering circuit include the first output loop, second
Output loop, the 3rd output loop, the 4th output loop；Described LLC control circuit controls end and connects switching circuit；Described switching
Circuit output end connects isolated variable circuit；Described isolated variable circuit output end connects current rectifying and wave filtering circuit；Described isolation is anti-
Current feed circuit input connects control circuit, and outfan connects current/voltage control circuit；Described current/voltage control circuit connects
4th output loop of current rectifying and wave filtering circuit；Described first output loop, the second output loop, the 3rd output loop, the 4th defeated
The outfan going out loop connects LED respectively.
Multiple-channel output constant-current circuit the most according to claim 1, it is characterised in that described switching circuit includes NMOS tube
Q1、Q2；Described Q1 drain electrode connects DC400V, and source electrode connects Q2 drain electrode, and grid connects LLC control circuit；Described Q2 source electrode connects
Ground, grid connects LLC control circuit.
Multiple-channel output constant-current circuit the most according to claim 1, it is characterised in that described isolated variable circuit includes inductance
L2, electric capacity C5, transformator T1；Described L2 connects T1；Described C5 one end connects Q2 source electrode, and the other end connects T1.
Multiple-channel output constant-current circuit the most according to claim 1, it is characterised in that described first output loop includes two poles
Pipe D1, D2, D3, D4, electric capacity C1, C2, CE1, described D1 positive pole connects D2 negative pole, C1 respectively；Described D1 negative pole connects D4 respectively
Negative pole, CE1 positive pole, LED；Described CE1 negative pole connects ground；Described D2 positive pole connects D3 positive pole ground connection respectively；Described D3 negative pole
Connect D4 positive pole and C2 respectively；
Described second output loop includes diode D5, D6, D7, D8, electric capacity C3, C4, CE2, and described D5 positive pole connects D6 respectively
Negative pole, C1；Described D5 negative pole connects D8 negative pole, CE2 positive pole, LED respectively；Described CE2 negative pole connects ground；Described D6 positive pole is respectively
Connect D7 positive pole ground connection；Described D7 negative pole connects D8 positive pole and C4 respectively；
Described 3rd output loop includes diode D9, D10, D11, D12, electric capacity C6, C7, CE3, and described D9 positive pole connects respectively
D10 negative pole, C6；Described D9 negative pole connects D12 negative pole, CE3 positive pole, LED respectively；Described CE3 negative pole connects ground；Described D10 is just
Pole connects D11 positive pole ground connection respectively；Described D11 negative pole connects D12 positive pole and C7 respectively；
Described 4th output loop includes diode D13, D14, D15, D16, electric capacity C8, C9, CE4, and described D9 positive pole connects respectively
Meet D14 negative pole, C6；Described D9 negative pole connects D16 negative pole, CE4 positive pole, LED respectively；Described CE4 negative pole connects resistance RES1 also
Ground connection；Described D14 positive pole connects D15 positive pole ground connection respectively；Described D15 negative pole connects D16 positive pole and C9 respectively.
Multiple-channel output constant-current circuit the most according to claim 4, it is characterised in that described C1, C2, C3, C4, C6, C7,
C8, C9 are current-sharing electric capacity.
Multiple-channel output constant-current circuit the most according to claim 1, it is characterised in that described isolation feedback circuit is optocoupler
U1A。
Multiple-channel output constant-current circuit the most according to claim 4, it is characterised in that described CE1, CE2, CE3, CE4 are respectively
Filter capacitor for current rectifying and wave filtering circuit output loop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620552201.7U CN205726567U (en) | 2016-06-08 | 2016-06-08 | A kind of multiple-channel output constant-current circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620552201.7U CN205726567U (en) | 2016-06-08 | 2016-06-08 | A kind of multiple-channel output constant-current circuit |
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| CN205726567U true CN205726567U (en) | 2016-11-23 |
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| CN201620552201.7U Active CN205726567U (en) | 2016-06-08 | 2016-06-08 | A kind of multiple-channel output constant-current circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106598127A (en) * | 2016-11-30 | 2017-04-26 | 无锡安特源科技股份有限公司 | Multipath output constant-current control circuit |
| CN107592704A (en) * | 2017-09-29 | 2018-01-16 | 深圳市华星光电技术有限公司 | A kind of constant-current circuit for LCD TV |
| CN109195261A (en) * | 2018-10-08 | 2019-01-11 | 深圳市崧盛电子股份有限公司 | A kind of multiple-channel output constant-current drive circuit and driving power |
-
2016
- 2016-06-08 CN CN201620552201.7U patent/CN205726567U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106598127A (en) * | 2016-11-30 | 2017-04-26 | 无锡安特源科技股份有限公司 | Multipath output constant-current control circuit |
| CN107592704A (en) * | 2017-09-29 | 2018-01-16 | 深圳市华星光电技术有限公司 | A kind of constant-current circuit for LCD TV |
| CN107592704B (en) * | 2017-09-29 | 2019-09-20 | 深圳市华星光电技术有限公司 | A kind of constant-current circuit for LCD TV |
| CN109195261A (en) * | 2018-10-08 | 2019-01-11 | 深圳市崧盛电子股份有限公司 | A kind of multiple-channel output constant-current drive circuit and driving power |
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