CN205827885U - A kind of LCD backlight power circuit - Google Patents
A kind of LCD backlight power circuit Download PDFInfo
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- CN205827885U CN205827885U CN201620631781.9U CN201620631781U CN205827885U CN 205827885 U CN205827885 U CN 205827885U CN 201620631781 U CN201620631781 U CN 201620631781U CN 205827885 U CN205827885 U CN 205827885U
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- pressure regulation
- interface
- regulation chip
- electric capacity
- resistance
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Abstract
The utility model discloses a kind of LCD backlight power circuit, belong to power circuit technical field.This utility model includes the first resistance to the 3rd resistance, the first electric capacity to the 4th electric capacity, first coil, the first diode, the first pressure regulation chip, signal input part, cathode voltage outfan, cathode voltage outfan.The advantage that this utility model has precise control, good stability.
Description
Technical field
This utility model belongs to power circuit technical field, relates to a kind of LCD backlight power circuit.
Background technology
In existing commercial production and each class of electronic devices, LCD backlight has become the most conventional technology.And in order to
Keep the stability of LCD backlight, the backlight electric power circuit for LCD powered generally is separately configured, the backlight electric power electricity powered for LCD
Road cannot be only used for powering for LCD, can be additionally used in the brightness controlling LCD backlight simultaneously.And existing LCD is in use, often
Occur that flashing is fixed and light flash more significantly phenomenon occurs, improving the stability that LCD backlight power circuit is powered
Can be as the one of which method solving this problem.
Summary of the invention
The purpose of this utility model is to there are the problems referred to above for existing technology, it is proposed that a kind of precise control, stable
The LCD backlight power circuit that property is good.
The purpose of the present invention can be realized by following technical proposal: a kind of LCD backlight power circuit, described LCD backlight
Power circuit includes the first resistance to the 3rd resistance, the first electric capacity to the 4th electric capacity, first coil, the first diode, and first adjusts
Pressure chip, signal input part, cathode voltage outfan, cathode voltage outfan, described first pressure regulation chip includes first interface
To the 6th interface, the first interface of described first pressure regulation chip connects 5V positive pole input voltage, the first of described first pressure regulation chip
Interface is via ground connection, the first interface warp of described first pressure regulation chip after the parallel circuit of the first electric capacity and the second electric capacity composition
Connecting the 4th interface of the first pressure regulation chip after first coil, the 4th interface of described first pressure regulation chip is successively through the first diode
Anode, negative electrode be followed by cathode voltage outfan, the negative electrode of described first diode ground connection after the 4th electric capacity, described first adjusts
Second interface of pressure chip connects signal input part after the first resistance, and the second interface of described first pressure regulation chip is through the second resistance
Rear ground connection, the 3rd interface ground connection after the 3rd electric capacity of described first pressure regulation chip, the 5th interface of described first pressure regulation chip
Even cathode voltage outfan, the 5th interface also ground connection after the 3rd resistance of described first pressure regulation chip, described first pressure regulation core
6th interfacing ground of sheet.
Compared with prior art, LCD backlight power circuit disclosed in the utility model is provided with pressure regulation chip, pressure regulation core
Sheet can adjust the signal of output according to the signal of input, improves the stability of the supply voltage of circuit, also improves simultaneously
Control the accuracy of the brightness of LCD backlight.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of LCD backlight power circuit.
Detailed description of the invention
The following is the specific embodiment of the present invention and combine accompanying drawing, technical scheme is further described,
But the present invention is not limited to these embodiments.
As shown in figure, a kind of LCD backlight power circuit, described LCD backlight power circuit includes the first resistance R1 to the
Three resistance R3, the first electric capacity C1 to the 4th electric capacity C4, first coil L1, the first diode D1, the first pressure regulation chip U1, signal is defeated
Entering and hold Vin, cathode voltage outfan V1, cathode voltage outfan V2, described first pressure regulation chip U1 includes that first interface is to
Six interfaces, the first interface of described first pressure regulation chip U1 connects 5V positive pole input voltage, the first of described first pressure regulation chip U1
Interface is via ground connection, the first of described first pressure regulation chip U1 after the parallel circuit of the first electric capacity C1 and the second electric capacity C2 composition
Interface connects the 4th interface of the first pressure regulation chip U1 after first coil L1, and the 4th interface of described first pressure regulation chip U1 is successively
Being followed by cathode voltage outfan V1 through anode, the negative electrode of the first diode D1, the negative electrode of described first diode D1 is through the 4th electricity
Holding ground connection after C4, second interface of described first pressure regulation chip U1 connects signal input part Vin after the first resistance R1, and described first
Second interface of pressure regulation chip U1 is ground connection after the second resistance R2, and the 3rd interface of described first pressure regulation chip U1 is through the 3rd electric capacity
Ground connection after C3, the 5th interface of described first pressure regulation chip U1 connects cathode voltage outfan V2, described first pressure regulation chip U1's
5th interface also ground connection after the 3rd resistance R3, the 6th interfacing ground of described first pressure regulation chip U1.
Described voltage signal inputs through signal input part Vin, and exports to second interface of the first pressure regulation chip U1, described
Second resistance R2 is connected to signal input part Vin, between the first resistance R1 and earth terminal, the second resistance R2 act as holding circuit
In in the earth terminal i.e. voltage difference of zero potential point, keep the stablizing of voltage of the second interface input of the first pressure regulation chip U1.Institute
State the 3rd interface ground connection after the 3rd electric capacity of the first pressure regulation chip U1, be for filtering, by by the of the first pressure regulation chip U1
Interference signal in the voltage signal of two interface inputs is removed, and improves the accuracy that the first pressure regulation chip U1 controls.
The first interface of the first pressure regulation chip U1 connects 5V positive pole input voltage, and 5V positive pole input voltage is used for the first pressure regulation core
The startup voltage of sheet U1.5V positive pole input voltage is ground connection after the first electric capacity C1, the parallel circuit that the second electric capacity C2 is constituted, described
In the first electric capacity C1, the second electric capacity C2 in parallel circuit, the capacitance of the first electric capacity C1 is big compared with the second electric capacity C2, and described the
One electric capacity C1 act as filtering, and the second electric capacity C2 act as prevent High-frequency Interference.
Described voltage signal after the first pressure regulation chip U1 after the first pressure regulation chip U1 pressure regulation again through the 4th interface and
5th interface output, described 4th interface and the 5th interface output cathode voltage signal, cathode voltage signal respectively, and finally
Exported by cathode voltage outfan V1, cathode voltage outfan V2 respectively.The brightness of LCD backlight is mainly by the size control of power
System, and the size of power is determined by voltage, when needing to adjust the brightness of LCD backlight, then adjusts the pressure regulation of the first pressure regulation chip U1
Multiple, simultaneously in order to prevent LCD backlight from the unstable phenomenons such as flicker occurring, improve the defeated of LCD backlight power circuit
The stability going out voltage solves this problem.
Described first diode D1 is connected between the 4th interface and the cathode voltage outfan V1 of the first pressure regulation chip U1, its
It act as preventing the backward voltage in circuit from the first pressure regulation chip U1 being impacted after cathode voltage signal is removed in output and damaging
Bad first pressure regulation chip U1, wherein cathode voltage outfan V1 also ground connection after the 4th electrician C4, its 4th electric capacity C4 is used for filtering
Ripple, prevents from there is interference signal in the cathode voltage signal of output.Described cathode voltage outfan V2 is followed by through the 3rd resistance R3
Ground, its voltage stability acting as improving the output of this end cathode voltage signal, keep cathode voltage and earth terminal zero potential
Voltage difference.
Connect between first interface and the 4th interface of the first pressure regulation chip U1 in above-mentioned LCD backlight power circuit and have the
One coil L1, the acting as of described first coil L1 prevents when unexpected power-off in circuit, the instantaneous electricity of two voltage output ends
Press through and occur that greatly circuit is caused damage by negative-phase sequence curent, improve the stability of circuit.
Specific embodiment described herein is only to present invention spirit explanation for example.Technology neck belonging to the present invention
Described specific embodiment can be made various amendment or supplements or use similar mode to replace by the technical staff in territory
Generation, but without departing from the spirit of the present invention or surmount scope defined in appended claims.
Claims (1)
1. a LCD backlight power circuit, it is characterised in that described LCD backlight power circuit includes that the first resistance is to the 3rd electricity
Resistance, the first electric capacity to the 4th electric capacity, first coil, the first diode, the first pressure regulation chip, signal input part, cathode voltage is defeated
Go out end, cathode voltage outfan, described first pressure regulation chip include first interface to the 6th interface, described first pressure regulation chip
First interface connects 5V positive pole input voltage, and the first interface of described first pressure regulation chip is via the first electric capacity and the second electric capacity structure
Ground connection after the parallel circuit become, the first interface of described first pressure regulation chip connects the 4th of the first pressure regulation chip after first coil
Interface, the 4th interface of described first pressure regulation chip anode, negative electrode through the first diode successively is followed by cathode voltage outfan,
The negative electrode of described first diode ground connection after the 4th electric capacity, the second interface of described first pressure regulation chip connects after the first resistance
Signal input part, the second interface ground connection after the second resistance of described first pressure regulation chip, the 3rd of described first pressure regulation chip
Interface is ground connection after the 3rd electric capacity, and the 5th interface of described first pressure regulation chip connects cathode voltage outfan, described first pressure regulation
5th interface of chip also ground connection after the 3rd resistance, the 6th interfacing ground of described first pressure regulation chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620631781.9U CN205827885U (en) | 2016-06-21 | 2016-06-21 | A kind of LCD backlight power circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620631781.9U CN205827885U (en) | 2016-06-21 | 2016-06-21 | A kind of LCD backlight power circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205827885U true CN205827885U (en) | 2016-12-21 |
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ID=58145966
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620631781.9U Active CN205827885U (en) | 2016-06-21 | 2016-06-21 | A kind of LCD backlight power circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN205827885U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107767836A (en) * | 2017-12-08 | 2018-03-06 | 武汉精测电子集团股份有限公司 | A kind of liquid crystal module realized based on FPGA opens the method and device of electric and powered-down sequential |
| CN108556632A (en) * | 2018-06-10 | 2018-09-21 | 重庆三三电器股份有限公司 | A kind of intelligence TFT instrument screen intensity wake-up circuits and its control method |
| CN114170971A (en) * | 2021-11-05 | 2022-03-11 | 惠州Tcl移动通信有限公司 | Filtering backlight circuit and mobile terminal |
-
2016
- 2016-06-21 CN CN201620631781.9U patent/CN205827885U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107767836A (en) * | 2017-12-08 | 2018-03-06 | 武汉精测电子集团股份有限公司 | A kind of liquid crystal module realized based on FPGA opens the method and device of electric and powered-down sequential |
| CN108556632A (en) * | 2018-06-10 | 2018-09-21 | 重庆三三电器股份有限公司 | A kind of intelligence TFT instrument screen intensity wake-up circuits and its control method |
| CN108556632B (en) * | 2018-06-10 | 2023-08-25 | 重庆三三电器股份有限公司 | Intelligent TFT instrument screen brightness wake-up circuit and control method thereof |
| CN114170971A (en) * | 2021-11-05 | 2022-03-11 | 惠州Tcl移动通信有限公司 | Filtering backlight circuit and mobile terminal |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |