CN206948672U - L ED backlight constant current circuit - Google Patents
L ED backlight constant current circuit Download PDFInfo
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- CN206948672U CN206948672U CN201720896611.8U CN201720896611U CN206948672U CN 206948672 U CN206948672 U CN 206948672U CN 201720896611 U CN201720896611 U CN 201720896611U CN 206948672 U CN206948672 U CN 206948672U
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Abstract
The utility model discloses an L ED constant current circuit that is shaded, a serial communication port, including transformer, Boost constant current unit and L ED unit, the transformer is equipped with input winding and first output winding, wherein, input winding is used for connecting power supply, first output winding with Boost constant current unit's input is connected, Boost constant current unit's output with L ED unit connection, first output winding has current input end and current output end, first output winding's current input end still is used for being connected to the output of superimposed power supply the utility model discloses a L ED constant current circuit that is shaded can effectively reduce L ED power supply circuit's current-voltage stress, alleviates the circuit burden, reduction in production cost to improve circuit's security.
Description
Technical field
It the utility model is related to power supply circuit field, more particularly to a kind of LED backlight constant-current circuit.
Background technology
In the prior art, it is usually that it is defeated to convert individually one group of pull-out by DC/DC to the power supply plan of LED backlight
After entering voltage, using a larger Boost voltage increase and current constants circuit by low defeated of script ignition voltage minimum than LED backlight
Enter voltage to be boosted, obtain enough as the output voltage of LED backlight power supply.But so also result in whole power supply circuit
Current Voltage stress it is big, so as to have to use the circuit element with more high withstand voltage ability, and Boost circuit
Power is big, causes high expensive.
The content of the invention
The purpose of the utility model embodiment is to provide a kind of LED backlight constant-current circuit, can effectively reduce LED power supply circuits
Current Voltage stress, mitigate circuit burden, reduce production cost, and improve the security of circuit.
To achieve the above object, the utility model embodiment provides a kind of LED backlight constant-current circuit, including transformer,
Boost voltage increase and current constants unit and LED unit；The transformer is provided with input winding and the first output winding；Wherein, the input
Winding is used to connect power supply；The first output winding is connected with the input of the Boost voltage increase and current constants unit, described
The output end of Boost voltage increase and current constant units is connected with the LED unit；The first output winding has current input terminal and electricity
Output end is flowed, the current input terminal of the first output winding is additionally operable to be connected to the output end of superposition power supply.
Compared with prior art, LED backlight constant-current circuit provided by the utility model, by described in transformer output
Input voltage needed for the boosting of Boost voltage increase and current constants unit, and described input voltage is added in the superimposed voltage,
The input voltage is boosted by Boost voltage increase and current constants unit, obtains the high voltage needed for LED unit.Meeting LED
On the basis of unit power supply, the power of the Boost voltage increase and current constants unit is reduced, alleviates Boost voltage increase and current constant units
Current Voltage stress and circuit burden, reduce the material cost in production process, improve the security that circuit uses.
As the improvement of such scheme, the Boost voltage increase and current constants unit includes the first electric capacity, inductance, switching tube, second
Diode and the second electric capacity；The first end of first electric capacity is connected by inductance with the input of the switching tube, and described
Second end of one electric capacity is connected with the output end of the switching tube；The positive pole of second diode and the input of the switching tube
End connection, the negative pole of second diode is connected with the first end of second electric capacity, the second end of second electric capacity and
The output end connection of the switching tube；Current input terminal of second end of first electric capacity also with the described first output winding connects
Connect；The first end of second electric capacity is connected with the output end of the Boost voltage increase and current constants unit；The control terminal of the switching tube
For receiving voltage up control signal.
As the improvement of such scheme, the Boost voltage increase and current constants unit includes the first electric capacity, inductance, switching tube, second
Diode and the second electric capacity；The first end of first electric capacity is connected by inductance with the input of the switching tube, described to open
Close positive pole of the input of pipe also with second diode to be connected, the negative pole of second diode and second electric capacity
First end is connected, and the second end of second electric capacity and the output end of the switching tube are connected to ground；First electric capacity
Current input terminal of second end also with the described first output winding is connected；The first end of second electric capacity and the Boost liters
Press the output end connection of constant current unit；The control terminal of the switching tube is used to receive voltage up control signal.
As the improvement of such scheme, the LED backlight constant-current circuit also includes the first diode, first output around
The current output terminal of group is connected with the positive pole of first diode, the negative pole of first diode and first electric capacity
First end connects.
As the improvement of such scheme, the transformer be additionally provided with for as it is described superposition power supply second output around
Group.
As the improvement of such scheme, the LED backlight constant-current circuit includes the 3rd diode and the 3rd electric capacity；Described
Two output windings have current input terminal and current output terminal；The current output terminal and the described 3rd 2 of the second output winding
The positive pole connection of pole pipe, the negative pole of the 3rd diode are connected with the first end of the 3rd electric capacity, the 3rd electric capacity
Second end is grounded, the current input terminal ground connection of the second output winding；The output end and the described 3rd 2 of the superposition power supply
The negative pole connection of pole pipe.
Compared with prior art, LED backlight constant-current circuit provided by the utility model is by setting the 3rd diode
With the 3rd electric capacity, the antijamming capability and stability of the superposition power supply are enhanced, while is also prevented from too high reverse electricity
Pressure causes the transformer to be damaged, and improves the security of the LED backlight constant-current circuit.
As the improvement of such scheme, the LED unit includes LED light group and resistance；It is defeated that the LED light group includes electric current
Enter end and current output terminal, the current input terminal of the LED light group be connected with the output end of the Boost voltage increase and current constants unit,
The current output terminal of the LED light group passes through the resistance eutral grounding.
As the improvement of such scheme, first electric capacity and the second electric capacity are electrochemical capacitor.
As the improvement of such scheme, the 3rd electric capacity is electrochemical capacitor.
As the improvement of such scheme, the switching tube can be FET or triode.
Brief description of the drawings
Fig. 1 is the circuit diagram of one embodiment of LED backlight constant-current circuit provided by the utility model.
Fig. 2 is a kind of circuit diagram of another embodiment of LED backlight constant-current circuit provided by the utility model.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out
Clearly and completely describing, it is clear that described embodiment is only the utility model part of the embodiment, rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made
The every other embodiment obtained, belong to the scope of the utility model protection.
It is a kind of circuit diagram for LED backlight constant-current circuit that the utility model embodiment 1 provides referring to Fig. 1.Wherein, institute
Stating LED backlight constant-current circuit includes transformer 1, Boost voltage increase and current constants circuit 2, LED unit 3.In the utility model embodiment
In, the electric capacity used in circuit is electrochemical capacitor, and in other embodiments, the electric capacity used in circuit can also be ceramic electrical
Appearance, electric capacity of the dacron etc., the beneficial effect of the utility model acquirement is not influenceed.
Transformer 1 includes input winding, the first output winding and the second output winding, the input winding connection DC/DC
Conversion power supply, the current output terminal of the first output winding are connected to Boost voltage increase and current constant circuits by the first diode D1
2, the current output terminal of the first output winding is connected to the output end of superposition power supply 4.Specifically, the first output winding
Current output terminal be connected to the first diode D1 positive pole, the first diode D1 negative pole is connected to Boost voltage increase and current constants electricity
The input on road 2.The voltage of the superposition power supply 4 is provided by the described second output winding, the electric current of the second output winding
Output end connects the 3rd diode D3 positive pole, and the output end of the negative pole connection superposition power supply 4 of the 3rd diode D3 is described
3rd diode D3 negative pole is also connected to the 3rd electric capacity C3 positive pole, and the negative pole of the 3rd electric capacity C3 is grounded, and described second
Export the current input terminal ground connection of winding.
The input of Boost voltage increase and current constants circuit 2 connects the first electric capacity C1 positive pole, and the first electric capacity C1 positive pole is also connected with
To inductance L1 first end, inductance L2 the second end is connected to switching tube Q1 input, and switching tube Q1 input is also connected with
To the second diode D2 positive pole, the second diode D2 negative pole is connected to the output end of Boost voltage increase and current constants circuit 2, and second
Diode D2 negative pole is also connected to the second electric capacity C2 positive pole, and the second electric capacity C2 negative pole is connected to switching tube Q1 output
End, switching tube Q1 output end are also connected to the first electric capacity C1 negative pole, and it is defeated that the first electric capacity C1 negative pole is connected to described first
Go out the current input terminal of winding, the current input terminal of the first output winding is also connected to the output end of superposition power supply 4.Switch
Pipe Q1 control terminal is used to receive voltage up control signal.In the present embodiment, switching tube Q1 selects FET, the switching tube
Q1 input corresponds to the source electrode of FET, and the output end of the switching tube Q1 corresponds to the drain electrode of FET, the switch
Pipe Q1 control terminal corresponds to the grid of FET, and in other embodiments, switching tube Q1 can also use triode, not influence
The beneficial effect that the utility model obtains.
LED unit 3 includes LED light group and resistance, the input of LED unit 3 and the output of Boost voltage increase and current constants circuit 2
End connection, and the current input terminal of the LED light group is connected to, the current output terminal of the LED light group is connect by the resistance
Ground.
With reference to Fig. 1, a kind of course of work of the LED backlight constant-current circuit provided the utility model embodiment 1 is carried out in detail
Thin description.Startup power supply, the first output winding of transformer 1 is that Boost voltage increase and current constants circuit 2 is powered, while the second output
Winding provides the voltage needed for superposition power supply 4.
First electric capacity C1 both end voltages difference is equal to current output terminal and the current input terminal both ends of the described first output winding
Pressure difference, because negative pole that low-pressure end is the first electric capacity C1 is connected to the output end of superposition power supply 4 so that Boost voltage increase and current constants electricity
In the case where the voltage stress that the first electric capacity C1 is born is constant, input voltage is raised on road 2, in switching tube Q1 input
When receiving boost signal, the high voltage after the output boosting of the output end of Boost voltage increase and current constants circuit 2, due to the second electric capacity C2's
Negative pole is also connected to be superimposed the output end of power supply 4, and the second electric capacity C2 low-pressure end is that the voltage of negative pole is applied power supply 4 and exports electricity
Pressure is raised, and the voltage stress that the second electric capacity C2 is born reduces, likewise, switching tube Q1 output end is connected to superposition power supply 4
Output end, switching tube Q1 source-drain voltage is reduced, reduce the first diode D1, switching tube Q1, the second diode D2 electric current
Stress.
Input of the output voltage of Boost voltage increase and current constants circuit 2 as LED unit 3, the electricity of the LED light group of LED unit 3
Stream input is connected with the output end of Boost voltage increase and current constants circuit 2, and the current output terminal of the LED light group passes through resistance
Ground connection, maintain the High Pressure Difference at both ends.
A kind of LED backlight constant-current circuit that the utility model embodiment 1 provides, the output electricity provided by being superimposed power supply 4
Pressure, the output voltage of Boost voltage increase and current constants circuit 2 is raised, electric capacity, diode in Boost voltage increase and current constant circuits are not increased
In the case of the electric current and voltage stress of switching tube, the power of Boost voltage increase and current constants circuit 2 is reduced, has saved boost process
In unnecessary power consumption, while improve the security of the LED backlight constant-current circuit, reduce the LED backlight
The production cost of constant-current circuit.
It is a kind of circuit diagram for LED backlight constant-current circuit that the utility model embodiment 2 provides referring to Fig. 2.Wherein, institute
Stating LED backlight constant-current circuit includes transformer 1, Boost voltage increase and current constants circuit 2, LED unit 3.In the utility model embodiment
In, the electric capacity used in circuit is electrochemical capacitor, and in other embodiments, the electric capacity used in circuit can also be ceramic electrical
Appearance, electric capacity of the dacron etc., the beneficial effect of the utility model acquirement is not influenceed.
Transformer 1 includes input winding, the first output winding and the second output winding, the input winding connection DC/DC
Conversion power supply, the current output terminal of the first output winding are connected to Boost voltage increase and current constant circuits by the first diode D1
2, the current output terminal of the first output winding is connected to the output end of superposition power supply 4.Specifically, the first output winding
Current output terminal be connected to the first diode D1 positive pole, the first diode D1 negative pole is connected to Boost voltage increase and current constants electricity
The input on road 2.The voltage of the superposition power supply 4 is provided by the described second output winding, the electric current of the second output winding
Output end connects the 3rd diode D3 positive pole, and the output end of the negative pole connection superposition power supply 4 of the 3rd diode D3 is described
3rd diode D3 negative pole is also connected to the 3rd electric capacity C3 positive pole, and the negative pole of the 3rd electric capacity C3 is grounded, and described second
Export the current input terminal ground connection of winding.
The input of Boost voltage increase and current constants circuit 2 connects the first electric capacity C1 positive pole, and the first electric capacity C1 positive pole is also connected with
To inductance L1 first end, the C1 of the first electric capacity negative pole is connected to the current input terminal of the first output winding, and described the
The current input terminal of one output winding is also connected to the output end of superposition power supply 4.Inductance L2 the second end is connected to switching tube Q1
Input, switching tube Q1 input is also connected to the second diode D2 positive pole, and the second diode D2 negative pole is connected to
The output end of Boost voltage increase and current constants circuit 2, the second diode D2 negative pole are also connected to the second electric capacity C2 positive pole, the second electricity
The negative pole for holding C2 is connected to switching tube Q1 output end, switching tube Q1 output head grounding.Switching tube Q1 control terminal is used to connect
Receive voltage up control signal.In the present embodiment, switching tube Q1 selects FET, the input corresponding fields effect of the switching tube Q1
Should pipe source electrode, the output end of the switching tube Q1 corresponds to the drain electrode of FET, the control terminal corresponding fields of the switching tube Q1
The grid of effect pipe, in other embodiments, switching tube Q1 can also use triode, not influence having for the utility model acquirement
Beneficial effect.
With reference to Fig. 2, a kind of course of work of the LED backlight constant-current circuit provided the utility model embodiment 2 is carried out in detail
Thin description.Startup power supply, the first output winding of transformer 1 is that Boost voltage increase and current constants circuit 2 is powered, while the second output
Winding provides the voltage needed for superposition power supply 4.
First electric capacity C1 both end voltages difference is equal to current output terminal and the current input terminal both ends of the described first output winding
Pressure difference, because negative pole that low-pressure end is the first electric capacity C1 is connected to the output end of superposition power supply 4 so that Boost voltage increase and current constants electricity
In the case where the voltage stress that the first electric capacity C1 is born is constant, input voltage is raised on road 2, in switching tube Q1 input
When receiving boost signal, the high voltage after the output boosting of the output end of Boost voltage increase and current constants circuit 2.
Input of the output voltage of Boost voltage increase and current constants circuit 2 as LED unit 3, the electricity of the LED light group of LED unit 3
Stream input is connected with the output end of Boost voltage increase and current constants circuit 2, and the current output terminal of the LED light group passes through resistance
Ground connection, maintain the High Pressure Difference at both ends.
A kind of LED backlight constant-current circuit that the utility model embodiment 1 provides, the output electricity provided by being superimposed power supply 4
Pressure, the output voltage of Boost voltage increase and current constants circuit 2 is raised, the first electric capacity C1 in Boost voltage increase and current constant circuits are not increased
In the case of voltage stress, the power of Boost voltage increase and current constants circuit 2 is reduced, has saved the unnecessary electric power in boost process
Loss, while the security of the LED backlight constant-current circuit is improved, reduce being produced into for the LED backlight constant-current circuit
This.
Described above is preferred embodiment of the present utility model, it is noted that for the ordinary skill of the art
For personnel, on the premise of the utility model principle is not departed from, some improvements and modifications can also be made, these are improved and profit
Decorations are also considered as the scope of protection of the utility model.
Claims (10)
1. a kind of LED backlight constant-current circuit, it is characterised in that including transformer, Boost voltage increase and current constants unit and LED unit；
The transformer is provided with input winding and the first output winding；Wherein, the input winding is used to connect power supply；Institute
The input that the first output winding is stated with the Boost voltage increase and current constants unit is connected, the output of the Boost voltage increase and current constants unit
End is connected with the LED unit；
The first output winding has current input terminal and current output terminal, and the current input terminal of the first output winding is also
For being connected to the output end of superposition power supply.
2. LED backlight constant-current circuit as claimed in claim 1, it is characterised in that the Boost voltage increase and current constants unit includes the
One electric capacity, inductance, switching tube, the second diode and the second electric capacity；
The first end of first electric capacity is connected by inductance with the input of the switching tube, the second end of first electric capacity
It is connected with the output end of the switching tube；The positive pole of second diode is connected with the input of the switching tube, and described
The negative pole of two diodes is connected with the first end of second electric capacity, and the second end of second electric capacity is defeated with the switching tube
Go out end connection；
Current input terminal of second end of first electric capacity also with the described first output winding is connected；The of second electric capacity
One end is connected with the output end of the Boost voltage increase and current constants unit；The control terminal of the switching tube is used to receive boosting rectifier control letter
Number.
3. LED backlight constant-current circuit as claimed in claim 1, it is characterised in that the Boost voltage increase and current constants unit includes the
One electric capacity, inductance, switching tube, the second diode and the second electric capacity；
The first end of first electric capacity is connected by inductance with the input of the switching tube, and the input of the switching tube is also
It is connected with the positive pole of second diode, the negative pole of second diode is connected with the first end of second electric capacity, institute
State the second end of the second electric capacity and the output end of the switching tube is connected to ground；
Current input terminal of second end of first electric capacity also with the described first output winding is connected；The of second electric capacity
One end is connected with the output end of the Boost voltage increase and current constants unit；The control terminal of the switching tube is used to receive boosting rectifier control letter
Number.
4. the LED backlight constant-current circuit as described in any one of Claims 2 or 3, it is characterised in that the LED backlight Constant Electric Current
Road also includes the first diode, and the current output terminal of the first output winding is connected with the positive pole of first diode, institute
The negative pole for stating the first diode is connected with the first end of first electric capacity.
5. LED backlight constant-current circuit as claimed in claim 1, it is characterised in that the transformer is additionally provided with for conduct
Second output winding of the superposition power supply.
6. LED backlight constant-current circuit as claimed in claim 5, it is characterised in that the LED backlight constant-current circuit includes the 3rd
Diode and the 3rd electric capacity；The second output winding has current input terminal and current output terminal；
The current output terminal of the second output winding is connected with the positive pole of the 3rd diode, and the 3rd diode is born
Pole is connected with the first end of the 3rd electric capacity, the second end ground connection of the 3rd electric capacity, the electric current of the second output winding
Input end grounding；The output end of the superposition power supply is connected with the negative pole of the 3rd diode.
7. LED backlight constant-current circuit as claimed in claim 1, it is characterised in that the LED unit includes LED light group and electricity
Resistance；The LED light group includes current input terminal and current output terminal, the current input terminal of the LED light group and the Boost liters
The output end connection of constant current unit is pressed, the current output terminal of the LED light group passes through the resistance eutral grounding.
8. LED backlight constant-current circuit as claimed in claim 2 or claim 3, it is characterised in that first electric capacity and the second electric capacity are equal
For electrochemical capacitor.
9. LED backlight constant-current circuit as claimed in claim 6, it is characterised in that the 3rd electric capacity is electrochemical capacitor.
10. the LED backlight constant-current circuit as described in any one of Claims 2 or 3, it is characterised in that the switching tube can be
FET or triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720896611.8U CN206948672U (en) | 2017-07-20 | 2017-07-20 | L ED backlight constant current circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720896611.8U CN206948672U (en) | 2017-07-20 | 2017-07-20 | L ED backlight constant current circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206948672U true CN206948672U (en) | 2018-01-30 |
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ID=61371249
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720896611.8U Active CN206948672U (en) | 2017-07-20 | 2017-07-20 | L ED backlight constant current circuit |
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| Country | Link |
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| CN (1) | CN206948672U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022041873A1 (en) * | 2020-08-24 | 2022-03-03 | 海信视像科技股份有限公司 | Display apparatus and step power circuit |
-
2017
- 2017-07-20 CN CN201720896611.8U patent/CN206948672U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022041873A1 (en) * | 2020-08-24 | 2022-03-03 | 海信视像科技股份有限公司 | Display apparatus and step power circuit |
| US11825577B2 (en) | 2020-08-24 | 2023-11-21 | Hisense Visual Technology Co., Ltd. | Display apparatus and step power circuit |
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| TR01 | Transfer of patent right |
Effective date of registration: 20200409 Address after: 510530 Guangdong city of Guangzhou province YUNPU Whampoa district four Road No. 6 Patentee after: Guangzhou Shiyuan Electronic Technology Company Limited Address before: 510530 Guangdong city of Guangzhou province YUNPU Whampoa district four Road No. 6 Co-patentee before: GUANGZHOU RUIXIN ELECTRONICS Co.,Ltd. Patentee before: Guangzhou Shiyuan Electronic Technology Company Limited |