CN207475938U - A kind of dual output LED drive circuit with drainage function - Google Patents
A kind of dual output LED drive circuit with drainage function Download PDFInfo
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- CN207475938U CN207475938U CN201721668060.6U CN201721668060U CN207475938U CN 207475938 U CN207475938 U CN 207475938U CN 201721668060 U CN201721668060 U CN 201721668060U CN 207475938 U CN207475938 U CN 207475938U
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Abstract
The utility model discloses a kind of dual output LED drive circuits with drainage function, it is intended to which LED drive circuit can not be realized and can not to eliminate remaining charge in the dual output LED circuit service life of LED caused by short by solving the problems, such as the LED circuit of the prior art；The application is provided with the first switch and second of releasing on LED drive circuit and releases switch, detect when the voltage overshoot of busbar that the second switch breakdown Zener diode of releasing carries out charge of releasing, under non-overshoot condition, first the release Zener diode of switch of switch short second of releasing carries out being directly grounded charge of releasing, the remaining charge in LED drive circuit can be efficiently discharged, improves the service life of LED；The application realizes the dual output of LED drive circuit by setting first switch and second switch and corresponding first LED load and the second LED load simultaneously；The application is suitable for the field of releasing of dual output LED drive circuit.
Description
Technical field
The utility model is related to LED drive circuits, and in particular to a kind of dual output LED driving electricity with drainage function
Road.
Background technology
It is one kind of semiconductor diode, electric energy can be converted to luminous energy.Light emitting diode and general-purpose diode one
Sample is made of a PN junction, it may have unilateral conduction.After forward voltage is added to light emitting diode, N is injected into from P areas
The hole in area and the electronics that P areas are injected by N areas, the hole near the PN junction in a few micrometers respectively with the electronics in N areas and P areas are answered
It closes, generates the fluorescence of spontaneous radiation.Energy state in different semi-conducting materials residing for electrons and holes is different.When electronics and
The amount released during hole-recombination is different, and the energy released is more, then the wavelength of the light sent out is shorter.The most commonly used is
It glows, the diode of green light or yellow light.The breakdown reverse voltage of light emitting diode is more than 5 volts.Its positive C-V characteristic is bent
Line is very steep, during use must series limiting resistor to control the electric current by diode.
In existing LED circuit, the charge accumulated of circuit can be caused after overshoot, certain circuit itself also has small part
Charge accumulated, if the charge in circuit largely accumulates, then open LED next time when, is easy to cause electrical part and burns out suddenly
Or staff is damaged；Existing generally use is that release switch power-up appearance, resistance etc. releases to circuit,
On the one hand the time of releasing is unable to control, on the other hand, resistance is released less efficient, and removing of the capacitance for remaining charge
It is limited；But remaining charge be easy to cause when LED is opened and dodges, and easily causes the damage of LED, then how to eliminate
Remaining charge in circuit has important meaning for the service life for extending LED.
Invention content
The purpose of this utility model is that：LED drive circuit can not be realized for the LED circuit of the prior art and can not
The remaining charge the problem of service life of LED is short caused by dual output LED circuit is eliminated, this application provides one kind
There is the dual output LED drive circuit of drainage function.
The technical solution adopted in the utility model is as follows：
A kind of dual output LED drive circuit with drainage function, including：First LED load, the second LED load, VDD,
Current generating circuit, 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 being born to the first LED load and the 2nd LED
Carry power supply；
First switch：Where being arranged on the first LED load in the first branch of current mirror；
Second switch：Where being arranged on the second LED load in the second branch of current mirror；
Control circuit：Control circuit：The first control signal V1 of output interlocking and second control signal V2, so as to obtain
One switch and second switch interlocking；
First LED load is different from the required load current of the second LED load；
Leadage circuit：For the remaining charge in leadage circuit.
The leadage circuit includes：
Current mirror is connected with detection circuit, and detection circuit is connected with control circuit of releasing, control circuit of releasing connection first
Switch and second of releasing is released switch；
Detection circuit：For the detection of the remaining charge of busbar；
It releases control circuit：Remaining charge signal that receiving test circuit is exported simultaneously selectively exports first control signal
And second control signal；
First releases switch：Receive the first control signal and the mistake for switch of being released by first control signal short circuit second
Punching protection circuit；
Second releases switch：It receives second control signal switch of selectively releasing with first and forms remaining charge discharging resisting
Circuit.
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 terminal 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 the source electrode of field-effect tube Q3 and the source electrode of field-effect tube Q4 with VDD；
The grid of field-effect tube Q2 is connect simultaneously with the grid of field-effect tube Q3 and the grid of field-effect tube Q4, 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, and second switch uses 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 beneficial effects of the utility model are：
The application is provided with the first switch and second of releasing on LED drive circuit and releases switch, detects the electricity of busbar
It presses through when punching the second switch breakdown Zener diode of releasing and carries out charge of releasing, under non-overshoot condition, first releases switch
The Zener diode that switch is released in short circuit second carries out being directly grounded charge of releasing, and can efficiently discharge in LED drive circuit
Remaining charge, solve in the prior art as being difficult releasing when charge remaining in LED drive circuit is less
Problem；
The application is by setting first switch and second switch and corresponding first LED load and second simultaneously
LED load exports the opening and closing of control first switch and second switch using control circuit, when first switch is in running order,
When second switch is in off working state, current mirror, field-effect tube Q3 are formed between field-effect tube Q2 and field-effect tube Q3
Output current works for the first LED load；When second switch is in running order, first switch be in off working state when
It waits, 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,
The dual output of LED drive circuit is realized, same drive circuitry is realized in the LED light of different operating current source, expands
The use scope of LED drive circuit.
Description of the drawings
It 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 deliberately draw attached drawing by actual size equal proportion scaling, 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 the leadage circuit figure of the driving circuit of the application；
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；700- leadage circuits.
Specific embodiment
Purpose, technical scheme and advantage to make the utility model embodiment are clearer, new below in conjunction with this practicality
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 part of the embodiment, instead of all the embodiments.Based on the implementation in the utility model
Example, those of ordinary skill in the art's all other embodiments obtained without making creative work, belongs to
The range of the utility model protection.
A kind of dual output LED drive circuit with drainage function, including：First LED load 510, the second LED load
520th, VDD100, current generating 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 of output interlocking and second control signal V2, so as 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.
Leadage circuit 700：For the remaining charge in leadage circuit.
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 terminal 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 the source electrode of field-effect tube Q3 and the source electrode of field-effect tube Q4 with VDD100；
The grid of field-effect tube Q2 is connect simultaneously with the grid of field-effect tube Q3 and the grid of field-effect tube Q4, 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, first field-effect tube of first switch, second switch uses the second field-effect tube,
First field-effect tube cut-in voltage is 3V, and the cut-in voltage of the second field-effect tube is 1V, and the load current of the first LED load is
1A,
The load current of second LED load is 3A, sets first switch and second switch and corresponding first
LED load and the second LED load are exported the opening and closing of control first switch and second switch using control circuit, work 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
In a kind of dual output LED drive circuit with drainage function described in embodiment two, the leadage circuit 700 wraps
It includes：
Current mirror 300 is connected with detection circuit, and detection circuit is connected with control circuit of releasing, control circuit of releasing connection the
One switch and second of releasing is released switch；
Detection circuit：For the detection of the remaining charge of busbar；
It releases control circuit：Remaining charge signal that receiving test circuit is exported simultaneously selectively exports first control signal
And second control signal；
First releases switch：Receive the first control signal and the mistake for switch of being released by first control signal short circuit second
Punching protection circuit；
Second releases switch：It receives second control signal switch of selectively releasing with first and forms remaining charge discharging resisting
Circuit.
Example IV
On the basis of a kind of dual output LED drive circuit with drainage function described in embodiment three, specifically, institute
Detection circuit is stated to be made of the 25th resistance R25 and the 26th resistance R26 connections；
The other end of the 25th resistance R25 is connect with busbar, the other end of the 26th resistance R26 and control of releasing
Circuit connection processed.
Specifically, described first release switch be made of the 31st resistance R31 and the 6th field-effect tube Q6；
31st resistance R31 is connect with control circuit of releasing, and the grid of field-effect tube Q2 and the 31st resistance R31 connect
It connects, the drain electrode of the 6th field-effect tube Q6 is released with source electrode and second switchs connection.
Specifically, described second release switch by the 5th field-effect tube Q5, Zener diode S5, the 30th resistance R30 and
Capacitance C16 is formed；
The grid and source electrode of 5th field-effect tube Q5 is connect with control circuit of releasing, the drain electrode of the 5th field-effect tube Q5
It being connect with the high electrode of Zener diode, the low electrode of Zener diode is connect respectively with capacitance C16 and the 30th resistance R30,
The other end of capacitance C16 and the 30th resistance R30 are connect with busbar.
Control circuit of releasing to control illustrates；Control circuit chip of releasing selects RT7786,
The VCC interfaces connection power supply of the control chip RT7786, the SC interfaces and the 27th of control chip RT7786
Resistance R27 and the 14th capacitance C14 connections connect with resistance R28 be grounded again again；
The interface of the HV of control chip RT7786 is connect with the 26th resistance R26；
The OUT1 interfaces of control chip RT7786 are connect with the 31st resistance R31；
The OUT2 interfaces of control chip RT7786 are connect with the grid of field-effect tube Q1, and chip is controlled in certain the present embodiment
The OUT2 interfaces of RT7786 are connect by the 29th resistance R29 with the grid of field-effect tube Q1；
The application releases to switch Q1 and release using control circuit control of releasing switchs the start and stop state of Q2, obtains best
Residual charge in efficiency of releasing and farthest leadage circuit.
Embodiment five
On the basis of above-described embodiment, as long as control circuit can export pulse square wave control signal；It may be used
DSP, CPU or GPU, the RISC Architecture of APU, ARM or x86 frameworks, quantum or the photon CPU choices of technology.
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 or single led lamp.
The above description is merely a specific embodiment, but protection scope 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 should
It is included within the scope of the present invention.
Claims (7)
1. a kind of dual output LED drive circuit with drainage function, which is characterized in that including：First LED load (510),
Two LED loads (520), VDD (100), current generating circuit (200), current mirror (300), first switch (610), second switch
(620), control circuit (400) and leadage circuit (700)；
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)：Where being arranged on the first LED load (510) in the first branch of current mirror (300)；
Second switch (620)：Where being arranged on the second LED load (520) in the second branch of current mirror (300)；
Control circuit (400)：The first control signal V1 of output interlocking and second control signal V2, so as 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)；
Leadage circuit (700)：For the remaining charge in leadage circuit.
2. a kind of dual output LED drive circuit with drainage function as described in claim 1, which is characterized in that described to let out
Electric discharge road (700) includes：
Current mirror (300) is connected with detection circuit, and detection circuit is connected with control circuit of releasing, control circuit of releasing connection first
Switch and second of releasing is released switch；
Detection circuit：For the detection of the remaining charge of busbar；
It releases control circuit：Remaining charge signal that receiving test circuit is exported simultaneously selectively exports first control signal and the
Two control signals；
First releases switch：Receive the first control signal and by first control signal short circuit second release switch overshoot protect
Protection circuit；
Second releases switch：It receives second control signal switch of selectively releasing with first and forms remaining charge discharging resisting electricity
Road.
A kind of 3. dual output LED drive circuit with drainage function as described in claim 1, which is characterized in that the electricity
Stream generation 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 VDD (100) is exported and generates reference current；
The output terminal 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 connection of field-effect tube Q1, the output of error amplifier U2 are 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.
A kind of 4. dual output LED drive circuit with drainage function as claimed in claim 3, which is characterized in that current mirror
(300) including 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 the source electrode of field-effect tube Q3 and the source electrode of field-effect tube Q4 with VDD (100)；
The grid of field-effect tube Q2 is connect simultaneously with the grid of field-effect tube Q3 and the grid of field-effect tube Q4, field-effect tube Q2's
Drain electrode is connect with the drain electrode of field-effect tube Q3.
A kind of 5. dual output LED drive circuit with drainage function as claimed in claim 4, which is characterized in that the field
The drain electrode of effect pipe Q3 is connect by first switch (610) with the first LED load (510) X1.
A kind of 6. dual output LED drive circuit with drainage function as claimed in claim 4, which is characterized in that the field
The drain electrode of effect pipe Q4 is connect by second switch (620) with the second LED load (520) X2.
7. a kind of dual output LED drive circuit with drainage function as described in claim 1, which is characterized in that described the
One switch (610) is using the first field-effect tube, and second switch (620) is using the second field-effect tube, the first field-effect tube and second
The cut-in voltage of field-effect tube is different.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721668060.6U CN207475938U (en) | 2017-12-05 | 2017-12-05 | A kind of dual output LED drive circuit with drainage function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721668060.6U CN207475938U (en) | 2017-12-05 | 2017-12-05 | A kind of dual output LED drive circuit with drainage function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207475938U true CN207475938U (en) | 2018-06-08 |
Family
ID=62257071
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721668060.6U Expired - Fee Related CN207475938U (en) | 2017-12-05 | 2017-12-05 | A kind of dual output LED drive circuit with drainage function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207475938U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114466480A (en) * | 2021-12-31 | 2022-05-10 | 珠海雷特科技股份有限公司 | LED driving circuit, device and driving method for silicon controlled rectifier dimming |
| CN116526821A (en) * | 2023-01-10 | 2023-08-01 | 深圳市思远半导体有限公司 | Chip, direct current-direct current circuit and control method thereof |
-
2017
- 2017-12-05 CN CN201721668060.6U patent/CN207475938U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114466480A (en) * | 2021-12-31 | 2022-05-10 | 珠海雷特科技股份有限公司 | LED driving circuit, device and driving method for silicon controlled rectifier dimming |
| CN116526821A (en) * | 2023-01-10 | 2023-08-01 | 深圳市思远半导体有限公司 | Chip, direct current-direct current circuit and control method thereof |
| CN116526821B (en) * | 2023-01-10 | 2024-03-19 | 深圳市思远半导体有限公司 | Chip, direct current-direct current circuit and control method thereof |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180608 Termination date: 20201205 |