CN207706481U - A kind of LED drive circuit of dual output - Google Patents
A kind of LED drive circuit of dual output Download PDFInfo
- Publication number
- CN207706481U CN207706481U CN201721653849.4U CN201721653849U CN207706481U CN 207706481 U CN207706481 U CN 207706481U CN 201721653849 U CN201721653849 U CN 201721653849U CN 207706481 U CN207706481 U CN 207706481U
- Authority
- CN
- China
- Prior art keywords
- field
- effect tube
- switch
- led
- current
- 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.)
- Expired - Fee Related
Links
Landscapes
- Led Devices (AREA)
Abstract
The utility model discloses a kind of LED drive circuits of dual output, it is intended to solve the problems, such as can not the exporting two load currents of the same LED drive circuit of the prior art and cannot be satisfied and the LED of two different operating size of current is arranged in same one drive circuit and then leads to the narrow application range of LED drive circuit；First switch and second switch is arranged in the application, and corresponding first LED load and the second LED load, when first switch is in running order, when second switch is in off working state, current mirror is formed between field-effect tube Q2 and field-effect tube Q3, field-effect tube Q3 output currents work for the first LED load；When the in running order first switch of second switch is in off working state, current mirror is formed between field-effect tube Q2 and field-effect tube Q4, field-effect tube Q4 output currents work for the second LED load, realize the dual output of LED drive circuit；The application is suitable for field of LED drive.
Description
Technical field
The utility model is related to LED drive circuit related fields, and in particular to a kind of LED drive circuit of dual output.
Background technology
Existing LED drive circuit is typically to be made of current generating circuit, control circuit and LED load；Control circuit
It controls electric current and generates voltage, voltage is used to use for multigroup LED load.But in actual use, when different or feelings
Condition needs the bright-dark degree of LED light different, but this directly cannot be satisfied needs by voltage-controlled two groups of LED loads.Than
It in tunnel, needs the bright-dark degree of lamp different in different situations, when almost not having vehicle in the late into the night, then needs to open
Dark LED, but vehicle flowrate is big when then need the LED light more to become clear.But if using same LED lamps into
The variation of row light and shade has a LED that will necessarily work under abnormal operating state, be easy to cause the short life of LED in this way；But
If using two voltage sources, the cost of the driving circuit of LED is necessarily caused to greatly increase in this way.So how to realize same drive
Dual output under dynamic circuit, the use for controlling LED have important meaning.
Invention content
The purpose of this utility model is that：For the same LED drive circuit of the prior art can not export two it is different
Load current and cannot be satisfied in same one drive circuit be arranged two different operating size of current LED so that cause LED to drive
The problem of narrow application range of dynamic circuit, this application provides a kind of LED drive circuits of dual output.
The technical solution adopted in the utility model is as follows：
A kind of LED drive circuit of dual output, including：First LED load, the second LED load, VDD, electric current generate electricity
Road, current mirror, first switch, second switch and control circuit；
VDD：Primary current is provided for circuit；
Current generating circuit：Receive the primary current that VDD is exported；
Current mirror：Receive the load current that current generating circuit is exported and for negative to the first LED load and the 2nd LED
Carry power supply；
First switch：It is arranged where the first LED load in the first branch of current mirror；
Second switch：It is arranged where the first LED load in the second branch of current mirror；
Control circuit：Control circuit：The first control signal V1 and second control signal V2 of output interlocking, to obtain the
One switch and second switch interlocking；
First LED load is different from the required load current of the second LED load.
Specifically, the current generating circuit include generating circuit from reference voltage, error amplifier U2, field-effect tube Q1 and
First resistor R1；
Generating circuit from reference voltage：It receives the primary current that VDD is exported and generates reference current；
The high electrode of error amplifier U2 and the output end of generating circuit from reference voltage connect, the low electricity of error amplifier U2
Pole is connect with the source electrode of field-effect tube Q1, and the output of error amplifier U2 is connect with the grid of field-effect tube Q1；
The source electrode of field-effect tube Q1 is connect with first resistor R1, the other end ground connection of first resistor R1.
Specifically, current mirror includes field-effect tube Q2, field-effect tube Q3 and field-effect tube Q4；
The drain electrode of field-effect tube Q1 is connect with the drain electrode of field-effect tube Q2；
The source electrode of field-effect tube Q2 is connect with VDD with the source electrode of the source electrode of field-effect tube Q3 and field-effect tube Q4；
The grid of field-effect tube Q2 is connect with the grid of the grid of field-effect tube Q3 and field-effect tube Q4 simultaneously, field-effect tube
The drain electrode of Q2 is connect with the drain electrode of field-effect tube Q3.
Specifically, the drain electrode of the field-effect tube Q3 is connect by first switch with the first LED load X1.
Specifically, the drain electrode of the field-effect tube Q4 is connect by second switch with the second LED load X2.
Specifically, the first switch uses the first field-effect tube, second switch to use the second field-effect tube, first effect
It should manage different with the cut-in voltage of the second field-effect tube.
In conclusion by adopting the above-described technical solution, the utility model has the beneficial effects that：
The application by be arranged first switch and second switch and third switch and corresponding first LED load,
Second LED load and third LED load export control first switch, second switch and third switch using control circuit
Opening and closing, when the in running order second switch of first switch and third switch in off working state when, field-effect tube
Current mirror is formed between Q2 and field-effect tube Q3, field-effect tube Q3 output currents work for the first LED load；At second switch
In working condition, when first switch and third switch are in off working state, between field-effect tube Q2 and field-effect tube Q4
Current mirror is formed, field-effect tube Q4 output currents work for the second LED load, and when third switch is in running order, first opens
Forming current mirror when pass and second switch are in off working state, between field-effect tube Q2 and field-effect tube Q7 realizes
The multi output of LED drive circuit realizes same drive circuitry in the LED light of different operating current source, expands LED drives
The use scope of dynamic circuit.
Description of the drawings
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description is only the utility model
Some embodiments for those of ordinary skill in the art without creative efforts, can also be according to this
A little attached drawings obtain other attached drawings.Attached drawing does not press actual size equal proportion scaling deliberately and draws attached drawing, it is preferred that emphasis is shows this
The purport of utility model.
Fig. 1 is the module diagram of the driving circuit of the application；
Fig. 2 is the circuit diagram of the driving circuit of the application；
Fig. 3 is that the control circuit of the utility model exports schematic diagram.
Reference numeral：
100-VDD；200- current generating circuits；300- current mirrors；400- control circuits；The first LED loads of 510-；520-
Second LED load；610- first switches；620- second switches；630- thirds switch；530- third LED loads.
Specific implementation mode
It is new below in conjunction with this practicality to keep the purpose, technical scheme and advantage of the utility model embodiment clearer
Attached drawing in type embodiment, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that is retouched
The embodiment stated is the utility model a part of the embodiment, instead of all the embodiments.Based on the implementation in the utility model
Example, every other embodiment obtained by those of ordinary skill in the art without making creative efforts belong to
The range of the utility model protection.
Embodiment one
A kind of LED drive circuit of dual output, including：First LED load 510, the second LED load 520, VDD100, electricity
Flow generation circuit 200, current mirror 300, first switch 610, second switch 620 and control circuit 400；
VDD100：Primary current is provided for circuit；
Current generating circuit 200：Receive the primary current that VDD100 is exported；
Current mirror 300：Receive the load current that is exported of current generating circuit 200 and for the first LED load 510 with
Second LED load 520 is powered；
First switch 610：It is arranged in the first branch of 510 place current mirror 300 of the first LED load；
Second switch 620：It is arranged in the second branch of 520 place current mirror 300 of the second LED load；
Control circuit 400：The first control signal V1 and second control signal V2 of output interlocking, to obtain first switch
610 and second switch 620 interlock；
First LED load 510 is different from the required load current of the second LED load 520.
Specifically, the current generating circuit 200 includes generating circuit from reference voltage, error amplifier U2, field-effect tube
Q1 and first resistor R1；
Generating circuit from reference voltage：It receives the primary current that VDD100 is exported and generates reference current；
The high electrode of error amplifier U2 and the output end of generating circuit from reference voltage connect, the low electricity of error amplifier U2
Pole is connect with the source electrode of field-effect tube Q1, and the output of error amplifier U2 is connect with the grid of field-effect tube Q1；
The source electrode of field-effect tube Q1 is connect with first resistor R1, the other end ground connection of first resistor R1.
Specifically, current mirror 300 includes field-effect tube Q2, field-effect tube Q3 and field-effect tube Q4；
The drain electrode of field-effect tube Q1 is connect with the drain electrode of field-effect tube Q2；
The source electrode of field-effect tube Q2 is connect with VDD100 with the source electrode of the source electrode of field-effect tube Q3 and field-effect tube Q4；
The grid of field-effect tube Q2 is connect with the grid of the grid of field-effect tube Q3 and field-effect tube Q4 simultaneously, field-effect tube
The drain electrode of Q2 is connect with the drain electrode of field-effect tube Q3.
Specifically, the drain electrode of the field-effect tube Q3 is connect by first switch 610 with the first LED load 510X1.
Specifically, the drain electrode of the field-effect tube Q4 is connect by second switch 620 with the second LED load 520X2.
Embodiment two
On the basis of embodiment one, the first switch uses the first field-effect tube, and second switch is using second effect
Ying Guan, the first field-effect tube cut-in voltage are 3V, and the cut-in voltage of the second field-effect tube is 1V, the load electricity of the first LED load
Stream is 1A, and the load current of the second LED load is 3A, and first switch and second switch and corresponding first is arranged
LED is loaded and the second LED load, and the opening and closing of control first switch and the second switch is exported using control circuit, works as first switch
It is in running order, when second switch is in off working state, electric current is formed between field-effect tube Q2 and field-effect tube Q3
Mirror, field-effect tube Q3 output currents work for the first LED load；When second switch is in running order, first switch is in non-
When working condition, current mirror is formed between field-effect tube Q2 and field-effect tube Q4, field-effect tube Q4 output currents supply second
LED load works, and realizes the dual output of LED drive circuit.
Embodiment three
On the basis of the above embodiments, as long as shown in figure 3, control circuit can export pulse square wave control signal i.e.
It can；It is equal that DSP, CPU or GPU, the RISC Architecture of APU, ARM or x86 frameworks, quantum or the photon CPU choices of technology may be used
It can.
Wherein it should be noted that the first LED load 510 is different from the required load current of the second LED load 520；It is negative
The electric current that electric current refers to the normal work of LED is carried, wherein the first LED load 510 can be multiple with the second LED load 520
LED array can also be single led lamp.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Belong to those skilled in the art in the technical scope disclosed by the present invention, the change or replacement that can be readily occurred in all are answered
It is included within the scope of the present invention.
Claims (6)
1. a kind of LED drive circuit of dual output, which is characterized in that including：First LED load (510), the second LED load
(520), VDD (100), current generating circuit (200), current mirror (300), first switch (610), second switch (620) and control
Circuit (400) processed；
VDD(100)：Primary current is provided for circuit；
Current generating circuit (200)：Receive the primary current that VDD (100) is exported；
Current mirror (300)：Receive the load current that current generating circuit (200) is exported and for giving the first LED load (510)
It powers with the second LED load (520)；
First switch (610)：It is arranged in the first branch of the first LED load (510) place current mirror (300)；
Second switch (620)：It is arranged in the second branch of the second LED load (520) place current mirror (300)；
Control circuit (400)：The first control signal V1 and second control signal V2 of output interlocking, to obtain first switch
(610) it is interlocked with second switch (620)；
First LED load (510) is different from the required load current of the second LED load (520).
2. a kind of LED drive circuit of dual output as described in claim 1, which is characterized in that the current generating circuit
(200) include generating circuit from reference voltage, error amplifier U2, field-effect tube Q1 and first resistor R1；
Generating circuit from reference voltage：It receives the primary current that VDD (100) is exported and generates reference current；
The output end of the high electrode of error amplifier U2 and generating circuit from reference voltage connects, the low electrode of error amplifier U2 with
The source electrode of field-effect tube Q1 connects, and the output of error amplifier U2 is connect with the grid of field-effect tube Q1；
The source electrode of field-effect tube Q1 is connect with first resistor R1, the other end ground connection of first resistor R1.
3. a kind of LED drive circuit of dual output as claimed in claim 2, which is characterized in that current mirror (300) includes field effect
It should pipe Q2, field-effect tube Q3 and field-effect tube Q4；
The drain electrode of field-effect tube Q1 is connect with the drain electrode of field-effect tube Q2；
The source electrode of field-effect tube Q2 is connect with VDD (100) with the source electrode of the source electrode of field-effect tube Q3 and field-effect tube Q4；
The grid of field-effect tube Q2 is connect with the grid of the grid of field-effect tube Q3 and field-effect tube Q4 simultaneously, field-effect tube Q2's
Drain electrode is connect with the drain electrode of field-effect tube Q3.
4. a kind of LED drive circuit of dual output as claimed in claim 3, which is characterized in that the leakage of the field-effect tube Q3
Pole is connect by first switch (610) with the first LED load (510) X1.
5. a kind of LED drive circuit of dual output as claimed in claim 3, which is characterized in that the leakage of the field-effect tube Q4
Pole is connect by second switch (620) with the second LED load (520) X2.
6. a kind of LED drive circuit of dual output as described in claim 1, which is characterized in that the first switch (610) is adopted
With the first field-effect tube, second switch (620) uses the second field-effect tube, the unlatching of the first field-effect tube and the second field-effect tube
Voltage is different.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721653849.4U CN207706481U (en) | 2017-12-01 | 2017-12-01 | A kind of LED drive circuit of dual output |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721653849.4U CN207706481U (en) | 2017-12-01 | 2017-12-01 | A kind of LED drive circuit of dual output |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207706481U true CN207706481U (en) | 2018-08-07 |
Family
ID=63024673
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721653849.4U Expired - Fee Related CN207706481U (en) | 2017-12-01 | 2017-12-01 | A kind of LED drive circuit of dual output |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207706481U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110390913A (en) * | 2019-06-26 | 2019-10-29 | 昆山龙腾光电有限公司 | Driving circuit, back light system and display device |
-
2017
- 2017-12-01 CN CN201721653849.4U patent/CN207706481U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110390913A (en) * | 2019-06-26 | 2019-10-29 | 昆山龙腾光电有限公司 | Driving circuit, back light system and display device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR20160042148A (en) | Localized power point optimizer for solar cell installations | |
| CN104333934A (en) | LED illumination driving circuit | |
| CN105656307A (en) | Charge pump circuit and grid turn-on voltage generating circuit | |
| CN105025632A (en) | Light-emitting diode (LED) lamp capable of color modulation by switches and control circuit thereof | |
| CN208488962U (en) | A kind of pixel circuit and display device | |
| CN106026618A (en) | Control circuit of switch power supply | |
| CN207706481U (en) | A kind of LED drive circuit of dual output | |
| CN105934026A (en) | Double-port constant current LED drive chip | |
| CN105576951A (en) | Current limiting method, current limiting-constant current combined power circuit and control method thereof | |
| CN105896941B (en) | A kind of Bootstrapping drive circuit that can generate negative pressure | |
| CN107750078A (en) | It is a kind of can feedback regulation LED drive circuit | |
| CN205657888U (en) | Auxiliary power circuit , LED drive circuit , LED driver | |
| CN207625836U (en) | One kind being based on pulse controlled dual output LED drive circuit | |
| CN108923626B (en) | A kind of negative pressure Bootstrapping drive circuit of three level T-type common source current transformer | |
| CN107770920A (en) | A kind of LED drive circuit occurred based on dipulse | |
| CN203872383U (en) | Discharging circuit of solar LED lighting device | |
| CN206323600U (en) | It is a kind of while changing the LED drive circuit of luminous flux and light color temperature | |
| CN201821272U (en) | Three-wire dimmer | |
| CN206517632U (en) | A kind of battery case controller of control lamp string | |
| CN201577223U (en) | LED driving circuit and display unit with same | |
| CN212183798U (en) | Intelligent traffic indicator lamp system | |
| CN108063549A (en) | A kind of isolation control circuit | |
| CN207475936U (en) | A kind of feedback regulation formula dual output LED drive circuit | |
| CN203596744U (en) | LED array interface circuit comprising three-winding coupling inductor | |
| CN103327697B (en) | Drive circuit and light emitting device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180807 Termination date: 20201201 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |