CN207475936U - A kind of feedback regulation formula dual output LED drive circuit - Google Patents
A kind of feedback regulation formula dual output LED drive circuit Download PDFInfo
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- CN207475936U CN207475936U CN201721653827.8U CN201721653827U CN207475936U CN 207475936 U CN207475936 U CN 207475936U CN 201721653827 U CN201721653827 U CN 201721653827U CN 207475936 U CN207475936 U CN 207475936U
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Abstract
The utility model discloses a kind of feedback regulation formula dual output LED drive circuit, according to the peculiar structure of dual output LED drive circuit provide it is a kind of can be with the LED drive circuit of feedback regulation dual output；The dual output of the application is the dual output of intermittence simultaneously, possibility is provided for sampling feedback circuit, only need single PWM that the feedback regulation of dual output can be realized, feedback circuit is the voltage signal by sampling out driving LED current lose-lose out position and is converted to feedback voltage, driving LED current in real time is flowed through on sampling resistor, and the FB ends of ohmically Voltage Feedback to PWM generation circuits, the voltage is and the waveform of LED current is driven to be consistent, capacitance plays filter action, so that the voltage for feeding back to FB is more steady, change with the variation of output driving LED current, PWM generation circuits export corresponding duty ratio according to the height of feedback voltage, thereby realize stable dual output driving LED current；The application is suitable for LED drive circuit circuit and modulates field.
Description
Technical field
The utility model is related to driving circuit fields, and in particular to a kind of feedback regulation formula dual output LED drive circuit.
Background technology
Existing LED drive current directly influences the illuminating effect of LED, and LED drive circuit is based on switching power circuit
Design, while the monitoring of LED current is the critically important part of circuit design in LED control system circuit, by direct
Electric current in feedback LED light can directly reflect the situation of the driving circuit in LED light, adjust LED drive current in real time, just not
It will appear：Electric current is excessive to cause LED to burn out, and electric current is too small so that LED luminance is inadequate.It is existing to be driven for the LED singly exported
The adjusting of circuit is more, but due to dual output LED drive circuit structure almost without, but the LED of dual output driving electricity
Road is equally unstable there is also circuit, and LED shines unstable situation, how the LED driving structures of dual output is adjusted and realized
LED stabilized illuminations.
Invention content
The purpose of this utility model is that：Providing one kind according to the peculiar structure of dual output LED drive circuit can be anti-
Feedback adjusts the LED drive circuit of dual output, and that realizes dual output stablizes output.
The technical solution adopted in the utility model is as follows：
A kind of feedback regulation formula dual output LED drive circuit, including：
First LED array, the second LED array, VDD, current generating circuit, current mirror, first switch, second switch and control
Circuit processed；
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 is exported of current generating circuit and for the first LED array and the 2nd LED gusts
Row power supply；
First switch：Where being arranged on the first LED array in the first branch of current mirror；
Second switch：Where being arranged on the second LED array in the second branch of current mirror；
Control circuit：The first control signal V1 of output interlocking and second control signal V2, so as to obtain first switch and
Second switch interlocks；
First LED array is different from the required load current of the second LED array；
The current generating circuit：It is adjusted including rectification circuit, power converter circuit, half-bridge driven output circuit and feedback
Economize on electricity road；
The rectification circuit connects VDD；The output terminal of the power converter circuit and rectification circuit connects；The power supply
The output terminal of converter circuit is connect with half-bridge driven output circuit；The output terminal and current mirror of the half-bridge driven output circuit
Connection；
The feedback regulating circuit is connect simultaneously with the first LED array and the second LED array, acquisition the first LED array and
The current signal of second LED array；
The feedback regulating circuit is connect with power converter circuit, and power converter circuit is according to feedback regulation electricity
The current signal that road is acquired carries out the load current of feedback regulation input current mirror.
Specifically, the rectification circuit is by the first diode D1, the second diode D2, third diode D3 and the four or two pole
Pipe D4；
The high electrode of the high electrode of first diode D1 and third diode D3 ground connection, the low electrode of the first diode D1 and
The low electrode of third diode D3 is connect with VDD；
High electrode of the low electrode of first diode D1 also with the second diode D2 is connect；
High electrode of the low electrode of third diode D3 also with the 4th diode D4 is connect；
The low electrode of second diode D2 and the low electrode of the 4th diode D4 are connected to the first potential point；
The input terminal of power converter circuit is connected to the first potential point.
Specifically, the power converter circuit is by the first capacitance C1, the second capacitance C2, first resistor R1, third capacitance
C3, second resistance R2 transformers U1 and the 5th diode D5；
One end of first capacitance C1 is connected to the first potential point, the other end ground connection of the first capacitance C1；
One end of first resistor R1 is connected to the first potential point, and the other end of the second capacitance C2 is another with first resistor R1's
End connection, the other end ground connection of the second capacitance C2；
One end of third capacitance C3 is connected to the first potential point, and one end of second resistance R2 is connected to the first potential point；
One end that the other end of third capacitance C3 and the other end of second resistance R2 are connected again with the 5th diode D5 is connect,
The other end of 5th diode D5 is connect with 1 port of transformer U1, and one end of second resistance R2 connects with 2 ports of transformer U1
It connects.
Specifically, the half-bridge driven output circuit includes the 6th diode D6, the 4th capacitance C4, field-effect tube Q1 and the
Five resistance R5；
3 ports of transformer U1 are connect with the high electrode of the 6th diode D6,4 ports and the ground connection of transformer U1, and the 6th
The low electrode of diode D6 is connect with one end of the 4th capacitance C4, the other end ground connection of the 4th capacitance C4；
The low electrode of 6th diode D6 is connect with the grid of field-effect tube Q1, and drain electrode and the current mirror of field-effect tube Q1 connect
It connects.
Specifically, the feedback regulating circuit includes PWM generation circuits, field-effect tube Q5, the 5th capacitance C5, the 6th capacitance
C6,3rd resistor R3, the 4th resistance R4, the 8th resistance R8, the 9th resistance R9, the first operational transconductance amplifiers U2 and second across
Conductivity type operational amplifier U3；
The VCC interfaces of PWM generation circuits are connect with the high electrode of the 5th diode D5, the VB interfaces of PWM generation circuits with
The grid connection of field-effect tube Q5, the drain electrode of field-effect tube Q5 are connect with 1 port of transformer U1；
The GT interface and the 5th capacitance C5 of PWM generation circuits are connected to the second potential point, another termination of the 5th capacitance C5
Ground；
The GT interface and the 6th capacitance C6 of PWM generation circuits are connected to third potential point, another termination of the 6th capacitance C6
Ground；
One end of 3rd resistor R3 is connected to the second potential point, and one end of the 4th resistance R4 is connected to the second potential point, the
The other end ground connection of three resistance R3, the other end of the 4th resistance R4 are connect with the output terminal of the first operational transconductance amplifiers U2；
One end of 8th resistance R8 is connected to the second potential point, and one end of the 9th resistance R9 is connected to the second potential point, the
The other end ground connection of eight resistance R8, the other end of the 9th resistance R9 are connect with the output terminal of the second operational transconductance amplifiers U3；
Two input terminals of first operational transconductance amplifiers U2 are connect with the both ends of the first LED array；
Two input terminals of second operational transconductance amplifiers U3 are connect with the both ends of the second LED array.
Specifically, the current mirror includes field-effect tube Q2, field-effect tube Q3 and field-effect tube Q4：
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 array X1；The field-effect
The drain electrode second switch of pipe Q4 is connect with the second LED array X2.
In conclusion by adopting the above-described technical solution, the beneficial effects of the utility model are：
The sampling feedback circuit is the voltage signal by sampling out driving LED current lose-lose out position and is converted to anti-
Feedthrough voltage flows through driving LED current in real time on the sampling resistor, samples the electric current on the sampling resistor using described
Operational transconductance amplifiers are converted to voltage, and the ohmically Voltage Feedback to the FB ends of the PWM generation circuits, institute
It is directly proportional with the electric current flowed through to state the 5th ohmically voltage, which is and the waveform of LED current is driven to be consistent, institute
It states the 5th capacitance and plays filter action so that the voltage for feeding back to FB is more steady, this voltage is with output driving LED
The variation of electric current and change, the PWM generation circuits export corresponding duty ratio according to the height of feedback voltage, thus realize
The dual output driving LED current stablized；The dual output of the application is the dual output of intermittence simultaneously, is carried for sampling feedback circuit
Having supplied may, it is only necessary to which the feedback regulation of dual output can be realized in single PWM.
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 partial circuit diagram of the current generating circuit in the application；
Fig. 2 is the module diagram of the LED drive circuit in the application；
Fig. 3 is the circuit diagram of the LED drive circuit in the application；
Reference numeral：
100-VDD；200- current generating circuits；300- current mirrors；400- control circuits；The first LED arrays of 510-；520-
Second LED array；610- first switches；620- second switches；210- rectification circuits；220- power converter circuits；230- half
Bridge drives output circuit；240- feedback regulating 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.
Embodiment one
A kind of feedback regulation formula dual output LED drive circuit, including：
First LED array 510, the second LED array 520, VDD100, current generating circuit 200, current mirror 300, first open
Close 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 array 510 with
Second LED array 520 is powered；
First switch 610：It is arranged in the first branch of 510 place current mirror 300 of the first LED array；
Second switch 620：It is arranged in the second branch of 520 place current mirror 300 of the second LED array；
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 array 510 is different from the required load current of the second LED array 520；
The current generating circuit 200：Including rectification circuit 210, power converter circuit 220, half-bridge driven output electricity
Road 230 and feedback regulating circuit 240；
The rectification circuit 210 connects VDD100；The output terminal of the power converter circuit 220 and rectification circuit 210
Connection；The output terminal of the power converter circuit 220 is connect with half-bridge driven output circuit 230；The half-bridge driven output
The output terminal of circuit 230 is connect with current mirror 300；
The feedback regulating circuit 240 is connect simultaneously with the first LED array 510 and the second LED array 520, acquisition first
The current signal of 510 and second LED array 520 of LED array；
The feedback regulating circuit 240 is connect with power converter circuit 220, and power converter circuit 220 is according to described
The current signal that feedback regulating circuit 240 is acquired carries out the load current of feedback regulation input current mirror 300.
Specifically, the rectification circuit 210 is by the first diode D1, the second diode D2, third diode D3 and the 4th
Diode D4；
The high electrode of the high electrode of first diode D1 and third diode D3 ground connection, the low electrode of the first diode D1 and
The low electrode of third diode D3 is connect with VDD100；
High electrode of the low electrode of first diode D1 also with the second diode D2 is connect；
High electrode of the low electrode of third diode D3 also with the 4th diode D4 is connect；
The low electrode of second diode D2 and the low electrode of the 4th diode D4 are connected to the first potential point；
The input terminal of power converter circuit 220 is connected to the first potential point.
Specifically, the power converter circuit 220 is by the first capacitance C1, the second capacitance C2, first resistor R1, third electricity
Hold C3, second resistance R2 transformers U1 and the 5th diode D5；
One end of first capacitance C1 is connected to the first potential point, the other end ground connection of the first capacitance C1；
One end of first resistor R1 is connected to the first potential point, and the other end of the second capacitance C2 is another with first resistor R1's
End connection, the other end ground connection of the second capacitance C2；
One end of third capacitance C3 is connected to the first potential point, and one end of second resistance R2 is connected to the first potential point；
One end that the other end of third capacitance C3 and the other end of second resistance R2 are connected again with the 5th diode D5 is connect,
The other end of 5th diode D5 is connect with 1 port of transformer U1, and one end of second resistance R2 connects with 2 ports of transformer U1
It connects.
Specifically, the half-bridge driven output circuit 230 includes the 6th diode D6, the 4th capacitance C4, field-effect tube Q1
With the 5th resistance R5；
3 ports of transformer U1 are connect with the high electrode of the 6th diode D6,4 ports and the ground connection of transformer U1, and the 6th
The low electrode of diode D6 is connect with one end of the 4th capacitance C4, the other end ground connection of the 4th capacitance C4；
The low electrode of 6th diode D6 is connect with the grid of field-effect tube Q1, the drain electrode of field-effect tube Q1 and current mirror
300 connections.
Specifically, the feedback regulating circuit 240 includes PWM generation circuits, field-effect tube Q5, the 5th capacitance C5, the 6th
Capacitance C6,3rd resistor R3, the 4th resistance R4, the 8th resistance R8, the 9th resistance R9, the first operational transconductance amplifiers U2 and
Second operational transconductance amplifiers U3；
The VCC interfaces of PWM generation circuits are connect with the high electrode of the 5th diode D5, the VB interfaces of PWM generation circuits with
The grid connection of field-effect tube Q5, the drain electrode of field-effect tube Q5 are connect with 1 port of transformer U1；
The GT interface and the 5th capacitance C5 of PWM generation circuits are connected to the second potential point, another termination of the 5th capacitance C5
Ground；
The GT interface and the 6th capacitance C6 of PWM generation circuits are connected to third potential point, another termination of the 6th capacitance C6
Ground；
One end of 3rd resistor R3 is connected to the second potential point, and one end of the 4th resistance R4 is connected to the second potential point, the
The other end ground connection of three resistance R3, the other end of the 4th resistance R4 are connect with the output terminal of the first operational transconductance amplifiers U2；
One end of 8th resistance R8 is connected to the second potential point, and one end of the 9th resistance R9 is connected to the second potential point, the
The other end ground connection of eight resistance R8, the other end of the 9th resistance R9 are connect with the output terminal of the second operational transconductance amplifiers U3；
Two input terminals of first operational transconductance amplifiers U2 are connect with the both ends of the first LED array 510；
Two input terminals of second operational transconductance amplifiers U3 are connect with the both ends of the second LED array 520.
Specifically, the current mirror 300 includes field-effect tube Q2, field-effect tube Q3 and field-effect tube Q4：
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 array 510X1；It is described
The drain electrode second switch 620 of field-effect tube Q4 is connect with the second LED array 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, and the load of the first LED array is electric
It flows for 1A,
The load current of second LED array is 3A, sets first switch and second switch and corresponding first
LED arrays and the second LED array 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 array；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 array works, and realizes the dual output of LED drive circuit.
Embodiment three
On the basis of above-described embodiment, 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 array 510 is different from the required load current of the second LED array 520；It is negative
The electric current that electric current refers to the normal work of LED is carried, wherein the first LED array 510 can be multiple with the second LED array 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 feedback regulation formula dual output LED drive circuit, which is characterized in that including：
First LED array (510), the second LED array (520), VDD (100), current generating circuit (200), current mirror (300),
First switch (610), second switch (620) and control circuit (400)；
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 array (510)
It powers with the second LED array (520)；
First switch (610)：Where being arranged on the first LED array (510) in the first branch of current mirror (300)；
Second switch (620)：Where being arranged on the second LED array (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 array (510) is different from the required load current of the second LED array (520)；
The current generating circuit (200)：Including rectification circuit (210), power converter circuit (220), half-bridge driven output
Circuit (230) and feedback regulating circuit (240)；
Rectification circuit (210) the connection VDD (100)；The power converter circuit (220) is defeated with rectification circuit (210)
Outlet connects；The output terminal of the power converter circuit (220) is connect with half-bridge driven output circuit (230)；The half-bridge
The output terminal of driving output circuit (230) is connect with current mirror (300)；
It the feedback regulating circuit (240) while is connect with the first LED array (510) and the second LED array (520), acquisition the
The current signal of one LED array (510) and the second LED array (520)；
The feedback regulating circuit (240) connect with power converter circuit (220), and power converter circuit (220) is according to institute
State the load current that the current signal that feedback regulating circuit (240) is acquired carries out feedback regulation input current mirror (300).
A kind of 2. feedback regulation formula dual output LED drive circuit as described in claim 1, which is characterized in that the rectified current
Road (210) is by the first diode D1, the second diode D2, third diode D3 and the 4th diode D4；
The high electrode of first diode D1 and the high electrode ground connection of third diode D3, the low electrode and third of the first diode D1
The low electrode of diode D3 is connect with VDD (100)；
High electrode of the low electrode of first diode D1 also with the second diode D2 is connect；
High electrode of the low electrode of third diode D3 also with the 4th diode D4 is connect；
The low electrode of second diode D2 and the low electrode of the 4th diode D4 are connected to the first potential point；
The input terminal of power converter circuit (220) is connected to the first potential point.
3. a kind of feedback regulation formula dual output LED drive circuit as claimed in claim 2, which is characterized in that the power supply becomes
Converter circuit (220) is by the first capacitance C1, the second capacitance C2, first resistor R1, third capacitance C3, second resistance R2 transformers U1
With the 5th diode D5；
One end of first capacitance C1 is connected to the first potential point, the other end ground connection of the first capacitance C1；
One end of first resistor R1 is connected to the first potential point, and the other end of the second capacitance C2 connects with the other end of first resistor R1
It connects, the other end ground connection of the second capacitance C2；
One end of third capacitance C3 is connected to the first potential point, and one end of second resistance R2 is connected to the first potential point；
One end that the other end of third capacitance C3 and the other end of second resistance R2 are connected again with the 5th diode D5 is connect, and the 5th
The other end of diode D5 is connect with 1 port of transformer U1, and one end of second resistance R2 is connect with 2 ports of transformer U1.
4. a kind of feedback regulation formula dual output LED drive circuit as claimed in claim 3, which is characterized in that the half-bridge drives
Dynamic output circuit (230) includes the 6th diode D6, the 4th capacitance C4, field-effect tube Q1 and the 5th resistance R5；
3 ports of transformer U1 are connect with the high electrode of the 6th diode D6,4 ports and ground connection, the six or two pole of transformer U1
The low electrode of pipe D6 is connect with one end of the 4th capacitance C4, the other end ground connection of the 4th capacitance C4；
The low electrode of 6th diode D6 is connect with the grid of field-effect tube Q1, drain electrode and the current mirror (300) of field-effect tube Q1
Connection.
5. a kind of feedback regulation formula dual output LED drive circuit as claimed in claim 4, which is characterized in that the feedback is adjusted
Economize on electricity road (240) includes PWM generation circuits, field-effect tube Q5, the 5th capacitance C5, the 6th capacitance C6,3rd resistor R3, the 4th electricity
Hinder R4, the 8th resistance R8, the 9th resistance R9, the first operational transconductance amplifiers U2 and the second operational transconductance amplifiers U3；
The VCC interfaces of PWM generation circuits are connect with the high electrode of the 5th diode D5, and VB interfaces and the field of PWM generation circuits are imitated
Should pipe Q5 grid connection, the drain electrode of field-effect tube Q5 connect with 1 port of transformer U1；
The GT interface and the 5th capacitance C5 of PWM generation circuits are connected to the second potential point, the other end ground connection of the 5th capacitance C5；
The GT interface and the 6th capacitance C6 of PWM generation circuits are connected to third potential point, the other end ground connection of the 6th capacitance C6；
One end of 3rd resistor R3 is connected to the second potential point, and one end of the 4th resistance R4 is connected to the second potential point, third electricity
The other end ground connection of R3 is hindered, the other end of the 4th resistance R4 is connect with the output terminal of the first operational transconductance amplifiers U2；
One end of 8th resistance R8 is connected to the second potential point, and one end of the 9th resistance R9 is connected to the second potential point, the 8th electricity
The other end ground connection of R8 is hindered, the other end of the 9th resistance R9 is connect with the output terminal of the second operational transconductance amplifiers U3；
Two input terminals of first operational transconductance amplifiers U2 are connect with the both ends of the first LED array (510)；
Two input terminals of second operational transconductance amplifiers U3 are connect with the both ends of the second LED array (520).
A kind of 6. feedback regulation formula dual output LED drive circuit as claimed in claim 5, which is characterized in that the current mirror
(300) including field-effect tube Q2, field-effect tube Q3 and field-effect tube Q4：
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 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 7. feedback regulation formula dual output LED drive circuit as claimed in claim 6, which is characterized in that the field-effect
The drain electrode of pipe Q3 is connect by first switch (610) with the first LED array (510) X1；The drain electrode second of the field-effect tube Q4
Switch (620) is connect with the second LED array (520) X2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721653827.8U CN207475936U (en) | 2017-12-01 | 2017-12-01 | A kind of feedback regulation formula dual output LED drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721653827.8U CN207475936U (en) | 2017-12-01 | 2017-12-01 | A kind of feedback regulation formula dual output LED drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207475936U true CN207475936U (en) | 2018-06-08 |
Family
ID=62256853
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721653827.8U Expired - Fee Related CN207475936U (en) | 2017-12-01 | 2017-12-01 | A kind of feedback regulation formula dual output LED drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207475936U (en) |
-
2017
- 2017-12-01 CN CN201721653827.8U patent/CN207475936U/en not_active Expired - Fee Related
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Granted publication date: 20180608 Termination date: 20201201 |