CN105405422B - A kind of voltage-stabilized power supply circuit and liquid crystal display device - Google Patents
A kind of voltage-stabilized power supply circuit and liquid crystal display device Download PDFInfo
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- CN105405422B CN105405422B CN201510909176.3A CN201510909176A CN105405422B CN 105405422 B CN105405422 B CN 105405422B CN 201510909176 A CN201510909176 A CN 201510909176A CN 105405422 B CN105405422 B CN 105405422B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3696—Generation of voltages supplied to electrode drivers
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/02—Details of power systems and of start or stop of display operation
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Dc-Dc Converters (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Liquid Crystal Display Device Control (AREA)
Abstract
The present invention provides a kind of voltage-stabilized power supply circuit, including booster power and Voltage stabilizing module.Voltage stabilizing module includes the second diode, the second capacitance, third diode, the 4th diode, first resistor；Wherein, the anode of second diode receives DC input voitage, the cathode of second diode is connected with the power input of first switch control unit, second capacitance connection is between the cathode and ground of the second diode, the plus earth of third diode, the cathode of third diode is connected with the cathode of the second diode, the cathode of 4th diode is connected with the cathode of the second diode, first resistor is connected between the anode of the 4th diode and the first end of the first capacitance, and the clamp voltage of third diode is more than the minimum operating voltage of first switch control unit.The present invention also provides a kind of liquid crystal display devices.The voltage-stabilized power supply circuit and liquid crystal display device of the present invention be when can prevent DC input voitage relatively low, and the phenomenon that cause output voltage unstable, it is at low cost.
Description
Technical field
The present invention relates to a kind of power circuit, more particularly to a kind of voltage-stabilized power supply circuit and liquid crystal display device.
Background technology
Liquid crystal display device (Liquid Crystal Display, LCD) has frivolous, energy saving, radiationless etc. many excellent
Point, therefore gradually replaced traditional cathode-ray tube (CRT) display.Liquid crystal display is widely used in height at present
The electronics such as clear DTV, desktop computer, personal digital assistant (PDA), laptop, mobile phone, digital camera
In equipment.
When liquid crystal display device works, power circuit provides necessary voltage for the driving circuit of liquid crystal display panel,
And the operating voltage of power circuit have a certain range (by taking G5517 as an example, ranging from 2.5V of the operating voltage on specifications~
5.5V), the power supply of the operating voltage provided power circuit may be due to other system modules such as video card module, audio-frequency module
Etc. energy consumption increase sharply less than the minimum value of this operating voltage, and power circuit may be caused to export to the voltage of driving circuit
It is abnormal, it is abnormal to may result in liquid crystal display panel display in this way.
Chip in existing power circuit is generally substituted for the broader chip of operating voltage, but this side by the prior art
Method is of high cost.
Therefore, it is necessary to improved technical solution is provided to overcome Yi Shang technical problem in the prior art.
Invention content
The main technical problem to be solved in the present invention is to provide a kind of voltage-stabilized power supply circuit, can export stable voltage and into
This is low.
The present invention provides a kind of voltage-stabilized power supply circuit, and the voltage-stabilized power supply circuit includes boost module and Voltage stabilizing module.Institute
It states boost module and includes the first inductance, first switching element, first switch control unit, the first diode, the first capacitance；Its
In, the first end of first inductance receives DC input voitage, the second end of first inductance and first diode
Anode be connected, the cathode of first diode is connected with the first end of first capacitance, the second of first capacitance
End ground connection, the first path terminal of the first switching element are connected with the anode of first diode, the first switch member
The alternate path end ground connection of part, the control terminal of the first switching element are connected with the first switch control unit；Voltage stabilizing mould
Block, the Voltage stabilizing module include the second diode, the second capacitance, third diode, the 4th diode, first resistor；Wherein, institute
The anode for stating the second diode receives the DC input voitage, the cathode of the second diode and the first switch control unit
Power input be connected, the first end of second capacitance is connected with the cathode of second diode, second capacitance
Second end ground connection, the plus earth of the third diode, the cathode of the third diode and second diode
Cathode is connected, and the cathode of the 4th diode is connected with the cathode of second diode, and the first resistor is connected to described
Between the first end of the anode of four diodes and first capacitance, the clamp voltage of third diode is controlled more than first switch
The minimum operating voltage of unit.
Further, first diode is Schottky diode.
Further, the third diode is zener diode.
Further, the first switching element in the boost module and the first switch control unit are integrated in
In power supply chip.
Further, the mould of the voltage stabilizing the second diode in the block, the second capacitance, third diode, the 4th diode,
First resistor is respectively positioned on the outside of power supply chip.
Further, the power pins of the power supply chip are connected with the cathode of second diode.
The present invention also provides a kind of liquid crystal display devices using above-mentioned voltage-stabilized power supply circuit.
Further, the liquid crystal display device further includes power supply chip, the first switch in the boost module
Element and the first switch control unit are integrated in power supply chip.
The voltage-stabilized power supply circuit and liquid crystal display device of the present invention can utilize and include the second diode, the second capacitance, third
Diode, the 4th diode, first resistor Voltage stabilizing module prevent DC input voitage minimum less than voltage-stabilized power supply circuit
During operating voltage, and the phenomenon that cause output voltage unstable, and it is at low cost.
Through the following detailed description with reference to the accompanying drawings, other aspects of the invention and feature become apparent.But it should know
Road, attached drawing be only explain purpose design, not as the restriction of the scope of the present invention, this is because its should refer to it is attached
The claim added.It should also be noted that unless otherwise noted, it is not necessary to which scale attached drawing, they only try hard to conceptually
Illustrate structure and flow described herein.
Description of the drawings
Fig. 1 is the structure diagram of the voltage-stabilized power supply circuit of first embodiment of the invention.
Fig. 2 is the structure diagram of the voltage-stabilized power supply circuit of second embodiment of the invention.
Specific embodiment
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, below in conjunction with the accompanying drawings to the present invention
Specific embodiment be described in detail.
Although the present invention describes different elements, signal, port, component or portion using first, second, third, etc. term
Point, but these elements, signal, port, component or part are not limited by these terms.These terms are intended merely to one
A element, signal, port, component or part are distinguished with another element, signal, port, component or part.In the present invention
In, an element, port, component or part and another element, port, component or part " connected ", " connection ", it is possible to understand that
To be directly electrically connected or it can be appreciated that indirect electric connection there are intermediary element.Unless otherwise defined, this
All terms (including technical terms and scientific terms) used in invention have and ordinary skill people of the art
The normally understood meaning of member institute.
Fig. 1 is the structure diagram of the voltage-stabilized power supply circuit of first embodiment of the invention.As shown in Figure 1, regulated power supply is electric
Road includes booster power and Voltage stabilizing module.
Wherein, boost module includes the first inductance L1, first switching element T1, first switch control unit U1, the one or two
Pole pipe D1, the first capacitance C1；Wherein, the first end of the first inductance L1 receives DC input voitage VIN, and the second of the first inductance L1
End is connected with the anode of the first diode D1, and the cathode of the first diode D1 is connected with the first end of the first capacitance C1, the first electricity
Hold the second end ground connection of C1, the first path terminal of first switching element T1 is connected with the anode of the first diode D1, first switch
The alternate path end ground connection of element T1, the control terminal of first switching element T1 are connected with first switch control unit U1.Wherein,
One diode D1 is Schottky diode.
Wherein, Voltage stabilizing module includes the second diode D2, the second capacitance C2, third diode D3, the 4th diode D4, the
One resistance R1；Wherein, the anode of the second diode D2 receives DC input voitage VIN, the cathode and first of the second diode D2
The power input of switch control unit U1 is connected, and the first end of the second capacitance C2 is connected with the cathode of the second diode D2, the
The second end ground connection of two capacitance C2, the plus earth of third diode D3, the cathode of third diode D3 and the second diode D2
Cathode be connected, the cathode of the 4th diode D4 is connected with the cathode of the second diode D2, and first resistor R1 is connected to the four or two
Between the first end of the anode of pole pipe D4 and the first capacitance C1.It is single that the clamp voltage of third diode D3 is more than first switch control
The minimum operating voltage of first U1.In an embodiment of the present invention, third diode D3 is zener diode.Certain this field
Technical staff it is understood that if the minimum operating voltage of first switch control unit U1 is relatively low, also may be used by third diode D3
Think other types of diode.
Specifically, when DC input voitage VIN is more than the minimum operating voltage of first switch control unit U1, first opens
It closes control unit U1 mainly to power using the electric current flowed through on the second diode D2, so as to output pulse width modulated signal to the
The control terminal of one switch element T1 is so that first switching element T1 is worked normally, so that boost module is by DC input voitage
VIN is promoted to output voltage Vmain.When DC input voitage VIN is less than the minimum operating voltage of first switch control unit U1
When, output voltage Vmain is exported after first resistor R1 and the 4th diode D4 to first switch control unit U1, and due to
The pressure stabilization function of second capacitance C2 and the clamping action of third diode D3, the voltage that first switching element control unit U1 is received
Can be more than the operating voltage operating voltage of first switching element control unit U1 (clamp voltage of third diode D3 be more than) and
Stablize near operating voltage, so as to which first switching element T1 be enable to work normally, and then make the defeated of booster circuit output stabilization
Go out voltage Vmain.
Fig. 2 is the structure diagram of the voltage-stabilized power supply circuit of second embodiment of the invention.As shown in Fig. 2, in boost module
First switching element T1 and first switch control unit U1 be integrated in power supply chip, the first inductance L1 in boost module,
First switching element T1, the first diode D1, the first capacitance C1 are located at the outside of power supply chip, the power input of power supply chip
VDD is connected with the cathode of the second diode D2.
In an embodiment of the present invention, mould the second diode D2 in the block, the second capacitance C2, the third diode of voltage stabilizing
D3, the 4th diode D4, first resistor R1 are located at the outside of power supply chip.Certainly it will be appreciated by those skilled in the art that
It is, it can be by the mould of voltage stabilizing the second diode D2 in the block, the second capacitance C2, third diode D3, the 4th diode D4, first
Resistance R1 at least one is integrated in power supply chip.
In an embodiment of the present invention, power supply chip can be G5517 chips, but the present invention is not limited thereto.
The present invention also provides a kind of liquid crystal display devices using above-mentioned voltage-stabilized power supply circuit.Voltage-stabilized power supply circuit includes rising
Voltage source and Voltage stabilizing module.
Wherein, boost module includes the first inductance L1, first switching element T1, first switch control unit U1, the one or two
Pole pipe D1, the first capacitance C1；Wherein, the first end of the first inductance L1 receives DC input voitage VIN, and the second of the first inductance L1
End is connected with the anode of the first diode D1, and the cathode of the first diode D1 is connected with the first end of the first capacitance C1, the first electricity
Hold the second end ground connection of C1, the first path terminal of first switching element T1 is connected with the anode of the first diode D1, first switch
The alternate path end ground connection of element T1, the control terminal of first switching element T1 are connected with first switch control unit U1.
Wherein, Voltage stabilizing module includes the second diode D2, the second capacitance C2, third diode D3, the 4th diode D4, the
One resistance R1；Wherein, the anode of the second diode D2 receives DC input voitage VIN, the cathode and first of the second diode D2
The power input of switch control unit U1 is connected, and the first end of the second capacitance C2 is connected with the cathode of the second diode D2, the
The second end ground connection of two capacitance C2, the plus earth of third diode D3, the cathode of third diode D3 and the second diode D2
Cathode be connected, the cathode of the 4th diode D4 is connected with the cathode of the second diode D2, and first resistor R1 is connected to the four or two
Between the first end of the anode of pole pipe D4 and the first capacitance C1.It is single that the clamp voltage of third diode D3 is more than first switch control
The minimum operating voltage of first U1.
The present invention voltage-stabilized power supply circuit and liquid crystal display device, can using include the second diode D2, the second capacitance C2,
Third diode D3, the 4th diode D4, first resistor R1 Voltage stabilizing module prevent DC input voitage VIN less than voltage stabilizing electricity
During the minimum operating voltage of source circuit, and the phenomenon that cause output voltage Vmain unstable, and it is at low cost.
Specific case used herein carries out the voltage-stabilized power supply circuit, liquid crystal display device and embodiment of the present invention
It illustrates, the explanation of embodiment of above is merely used to help understand method and its core concept of the invention；Meanwhile for this
The those skilled in the art in field, thought according to the present invention, there will be changes in specific embodiments and applications,
To sum up, the content of the present specification should not be construed as limiting the invention, and protection scope of the present invention should be with appended claim
Subject to.
Claims (8)
1. a kind of voltage-stabilized power supply circuit, which is characterized in that the voltage-stabilized power supply circuit includes：
Boost module, the boost module include the first inductance, first switching element, first switch control unit, the one or two pole
Pipe, the first capacitance；
Wherein, the first end of first inductance receives DC input voitage, the second end of first inductance and described first
The anode of diode is connected, and the cathode of first diode is connected with the first end of first capacitance, first capacitance
Second end ground connection, the first path terminal of the first switching element is connected with the anode of first diode, described first
The alternate path end ground connection of switch element, the control terminal of the first switching element are connected with the first switch control unit；
Voltage stabilizing module, the Voltage stabilizing module include the second diode, the second capacitance, third diode, the 4th diode, the first electricity
Resistance；
Wherein, the anode of second diode receives the DC input voitage, the cathode of the second diode and described first
The power input of switch control unit is connected, and the first end of second capacitance is connected with the cathode of second diode,
Second capacitance second end ground connection, the plus earth of the third diode, the cathode of the third diode with it is described
The cathode of second diode is connected, and the cathode of the 4th diode is connected with the cathode of second diode, the first resistor
It is connected between the anode of the 4th diode and the first end of first capacitance, the clamp voltage of third diode is more than
The minimum operating voltage of first switch control unit.
2. voltage-stabilized power supply circuit as described in claim 1, which is characterized in that first diode is Schottky diode.
3. voltage-stabilized power supply circuit as described in claim 1, which is characterized in that the third diode is zener diode.
4. voltage-stabilized power supply circuit as described in claim 1, which is characterized in that the first switch member in the boost module
Part and the first switch control unit are integrated in power supply chip.
5. voltage-stabilized power supply circuit as claimed in claim 4, which is characterized in that the second diode in the Voltage stabilizing module,
Two capacitances, third diode, the 4th diode, first resistor are respectively positioned on the outside of power supply chip.
6. voltage-stabilized power supply circuit as claimed in claim 5, which is characterized in that the power pins of the power supply chip and described the
The cathode of two diodes is connected.
7. a kind of liquid crystal display device, which is characterized in that the liquid crystal display device includes the voltage stabilizing as described in claim 1
Power circuit.
8. liquid crystal display device as claimed in claim 7, which is characterized in that the liquid crystal display device further includes power supply core
Piece, the first switching element and the first switch control unit in the boost module are integrated in power supply chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510909176.3A CN105405422B (en) | 2015-12-10 | 2015-12-10 | A kind of voltage-stabilized power supply circuit and liquid crystal display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510909176.3A CN105405422B (en) | 2015-12-10 | 2015-12-10 | A kind of voltage-stabilized power supply circuit and liquid crystal display device |
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| Publication Number | Publication Date |
|---|---|
| CN105405422A CN105405422A (en) | 2016-03-16 |
| CN105405422B true CN105405422B (en) | 2018-07-06 |
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| CN201510909176.3A Active CN105405422B (en) | 2015-12-10 | 2015-12-10 | A kind of voltage-stabilized power supply circuit and liquid crystal display device |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114596823B (en) * | 2020-12-07 | 2023-04-25 | 华润微集成电路(无锡)有限公司 | LCD driving circuit structure for realizing low power consumption and wide working voltage |
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| CN201946973U (en) * | 2011-01-17 | 2011-08-24 | 惠州Tcl移动通信有限公司 | Static protection device of mobile terminal with touch screen |
| CN202210839U (en) * | 2011-08-01 | 2012-05-02 | 北京彩讯科技股份有限公司 | Simulated high definition video interface clamping protective circuit |
| CN203895095U (en) * | 2014-05-28 | 2014-10-22 | 广州视源电子科技股份有限公司 | Backlight power supply circuit of display screen |
| CN204166058U (en) * | 2014-09-05 | 2015-02-18 | 江苏银佳企业集团有限公司 | A kind of city electro-mechanical wave quick detection circuit |
| CN104754805A (en) * | 2013-12-31 | 2015-07-01 | 深圳富泰宏精密工业有限公司 | Backlight driving device |
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2015
- 2015-12-10 CN CN201510909176.3A patent/CN105405422B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20070121284A (en) * | 2006-06-21 | 2007-12-27 | 엘지.필립스 엘시디 주식회사 | Lcd and driving method thereof |
| CN201946973U (en) * | 2011-01-17 | 2011-08-24 | 惠州Tcl移动通信有限公司 | Static protection device of mobile terminal with touch screen |
| CN202210839U (en) * | 2011-08-01 | 2012-05-02 | 北京彩讯科技股份有限公司 | Simulated high definition video interface clamping protective circuit |
| CN104754805A (en) * | 2013-12-31 | 2015-07-01 | 深圳富泰宏精密工业有限公司 | Backlight driving device |
| CN203895095U (en) * | 2014-05-28 | 2014-10-22 | 广州视源电子科技股份有限公司 | Backlight power supply circuit of display screen |
| CN204166058U (en) * | 2014-09-05 | 2015-02-18 | 江苏银佳企业集团有限公司 | A kind of city electro-mechanical wave quick detection circuit |
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| CN105405422A (en) | 2016-03-16 |
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Address after: 215301, 1, Longteng Road, Kunshan, Jiangsu, Suzhou Patentee after: Kunshan Longteng Au Optronics Co Address before: 215301, 1, Longteng Road, Kunshan, Jiangsu, Suzhou Patentee before: Kunshan Longteng Optronics Co., Ltd. |