CN110086337A - Voltage conversion circuit - Google Patents
Voltage conversion circuit Download PDFInfo
- Publication number
- CN110086337A CN110086337A CN201910364451.6A CN201910364451A CN110086337A CN 110086337 A CN110086337 A CN 110086337A CN 201910364451 A CN201910364451 A CN 201910364451A CN 110086337 A CN110086337 A CN 110086337A
- Authority
- CN
- China
- Prior art keywords
- voltage
- transformation module
- conversion circuit
- voltage transformation
- low potential
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/1563—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators without using an external clock
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Liquid Crystal Display Device Control (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The present invention provides a kind of voltage conversion circuit.The voltage conversion circuit includes control signal generator module and voltage transformation module, the output end for controlling signal generator module is electrically connected the control terminal of voltage transformation module, the input terminal of voltage transformation module accesses supply voltage, when work, control terminal transmission of control signals of the signal generator module from its output end to voltage transformation module is controlled, voltage transformation module carries out conversion generation constant pressure low potential to supply voltage under control of the control signal and exported by its output end.Driving capability of the present invention is strong, stable constant pressure low potential can be exported, with the leakage current being effectively reduced in GOA circuit.
Description
Technical field
The present invention relates to field of display technology more particularly to a kind of voltage conversion circuits.
Background technique
Liquid crystal display (Liquid Crystal Display, LCD) has thin fuselage, power saving, radiationless etc. numerous excellent
Point, is widely used.Such as: LCD TV, mobile phone, personal digital assistant (PDA), digital camera, computer screen
Curtain or laptop screen etc., occupy an leading position in flat display field.
GOA (Gate Driver on Array) technology, that is, array substrate row actuation techniques is to utilize thin film transistor (TFT)
Gated sweep driving circuit is produced on film crystal by (Thin Film Transistor, TFT) LCD (Liquid Crystal Display) array processing procedure
In pipe array substrate, to realize the driving method of progressive scan, having reduces production cost and realizes panel narrow frame design
Advantage is used by a variety of displays.GOA circuit has two basic functions: first is output gated sweep driving signal, is driven
Grid line in dynamic panel, opens the TFT in viewing area, to charge to pixel；Second is shift LD function, when one
After the completion of the output of gated sweep driving signal, the output of next gated sweep driving signal is carried out by clock control, and according to
It is secondary to hand on.GOA technology can be reduced welding (bonding) process of external chip (IC), has an opportunity to promote production capacity and reduce
Product cost, and liquid crystal display panel can be made to be more suitable for making the display product of narrow frame.
In the prior art, in order to which the scanning signal to key node and GOA circuit output in GOA circuit pulls down
And drop-down maintains, and reduces the leakage current of the thin film transistor (TFT) of drop-down scanning signal, needs crucial to GOA circuit transmission respectively
Node low potential and scanning signal low potential, key node low potential will be lower than scanning signal low potentials (generally between the two
Difference be 2V or more).Wherein, scanning signal low potential is by the system low potential collocation pressure stabilizing electricity lower than scanning signal low potential
Road generates, and key node low potential is generated by system low potential.Referring to Fig. 1, to be existing for generating the low electricity of scanning signal
The circuit diagram of the voltage conversion circuit of position, the voltage conversion circuit include power management chip (PMIC) 100, triode T10, the
One resistance R10, diode D10, capacitor C10, second resistance R20 and level conversion unit 200.Power management chip 100 it is defeated
Outlet is electrically connected the emitter of triode T10 with output system low potential VGL.The base stage of triode T10 is electrically connected two poles
The anode of pipe D10, the input terminal that collector is electrically connected level conversion unit 200 export scanning signal low potential Vssg to it,
Output is into GOA circuit after being converted by level conversion unit 200 to scanning signal low potential Vssg.First resistor R10's
The base stage and emitter of triode T10 is electrically connected in both ends.The minus earth of diode D10.One end of capacitor C10 is electrical
The collector of connecting triode T10, other end ground connection.The both ends of capacitor C10 are electrically connected in the both ends of second resistance R20.
The driving force of this voltage conversion circuit is insufficient, and scanning signal low potential Vssg can leak electricity to system low potential VGL in actual work,
So that scanning signal low potential Vssg is substantially subjected to the control of constant pressure low potential VGL, lead to key node low potential and scanning
It not can guarantee enough pressure differences between signal low potential, and then the leakage current of thin film transistor (TFT) in GOA circuit can not be effectively reduced,
Usually by the resistance value of change second resistance R20 to solve the above problems, however effect is poor.
Summary of the invention
The purpose of the present invention is to provide a kind of voltage conversion circuits, and driving force is high, can export the low electricity of stable constant pressure
Position, with the leakage current being effectively reduced in GOA circuit.
To achieve the above object, the present invention provides a kind of voltage conversion circuit, including control signal generator module and voltage
Conversion module；
The output end of the control signal generator module is electrically connected the control terminal of voltage transformation module to convert to voltage
The control terminal transmission of control signals of module；
The input terminal of the voltage transformation module accesses supply voltage, under control of the control signal to supply voltage
It is converted to generate constant pressure low potential, the output end of the voltage transformation module exports constant pressure low potential.
The voltage transformation module includes switch unit, inductance, diode and capacitor；The control terminal of the switch unit is
The control terminal of voltage transformation module, first end are the input terminal of voltage transformation module, and second end is electrically connected one end of inductance, institute
Switch unit is stated its first end is turned on or off with second end for the control of suspension control signal；The other end of the inductance
Ground connection；The cathode of the diode is electrically connected one end of inductance, and anode is the output end of voltage transformation module；The capacitor
One end is electrically connected the anode of diode, other end ground connection.
The voltage transformation module further includes resistance；The both ends of capacitor are electrically connected in the both ends of the resistance.
The diode is Schottky diode.
The maximum peak inverse voltage repeatedly of the diode is 40V, and the average switching current of maximum is 2A.
The switch unit is field-effect tube；The grid of the field-effect tube is the control terminal of switch unit, source electrode and leakage
Pole is respectively the first end and second end of switch unit.
The control signal generator module is power management chip.
The output end of the voltage transformation module is for being electrically connected GOA circuit；The constant pressure low potential is scanning signal
Low potential.
The constant pressure low potential is -5V~-6V.
The supply voltage is greater than 0.
Beneficial effects of the present invention: voltage conversion circuit of the invention includes control signal generator module and voltage modulus of conversion
Block, the output end for controlling signal generator module are electrically connected the control terminal of voltage transformation module, the input terminal of voltage transformation module
Supply voltage is accessed, when work, control terminal of the signal generator module from its output end to voltage transformation module is controlled and transmits control
Signal, voltage transformation module carry out conversion to supply voltage under control of the control signal and generate constant pressure low potential and by its output
End output, driving capability is strong, stable constant pressure low potential can be exported, with the leakage current being effectively reduced in GOA circuit.
Detailed description of the invention
For further understanding of the features and technical contents of the present invention, it please refers to below in connection with of the invention detailed
Illustrate and attached drawing, however, the drawings only provide reference and explanation, is not intended to limit the present invention.
In attached drawing,
Fig. 1 is the structural schematic diagram of existing voltage conversion circuit；
Fig. 2 is the structural schematic diagram of voltage conversion circuit of the invention.
Specific embodiment
Further to illustrate technological means and its effect adopted by the present invention, below in conjunction with preferred implementation of the invention
Example and its attached drawing are described in detail.
Referring to Fig. 2, the present invention provides a kind of voltage conversion circuit, including control signal generator module 10 and voltage conversion
Module 20.
The output end of the control signal generator module 10 is electrically connected the control terminal of voltage transformation module 20, for by it
Control terminal transmission of control signals of the output end to voltage transformation module 20.
The input terminal of the voltage transformation module 20 accesses supply voltage VCC, under control of the control signal to electricity
Source voltage VCC is converted to generate constant pressure low potential VSSG, the low electricity of output end output constant pressure of the voltage transformation module 20
Position VSSG.
Specifically, the voltage transformation module 20 includes switch unit 21, inductance L1, diode D1 and capacitor C1.It is described
The control terminal of switch unit 21 is the control terminal of voltage transformation module 20, and first end is the input terminal of voltage transformation module 20, the
Two ends are electrically connected one end of inductance L1, the switch unit 21 for suspension control signal control and by its first end and second
End is turned on or off.The other end of the inductance L1 is grounded.The cathode of the diode D1 is electrically connected one end of inductance L1, sun
The extremely output end of voltage transformation module 20.One end of the capacitor C1 is electrically connected the anode of diode D1, other end ground connection.
Further, in the embodiment shown in Figure 2, the voltage transformation module 20 further includes resistance R1.The resistance
The both ends of capacitor C1 are electrically connected in the both ends of R1.
Preferably, the diode D1 is Schottky diode.
It is highly preferred that the maximum peak inverse voltage repeatedly of the diode D1 is 40V, the average switching current of maximum is
2A。
Specifically, in the embodiment shown in Figure 2, the switch unit 21 is field-effect tube Q1.The field-effect tube Q1
Grid be switch unit 21 control terminal, source electrode and drain electrode be respectively switch unit 21 first end and second end.Certainly, exist
In the other embodiment of the present invention, the switch unit 21 also can choose the common switch unit such as thin film transistor (TFT), this is simultaneously
It will not influence realization of the invention.
Preferably, the control signal generator module 10 is power management chip.
Specifically, the output end of the voltage transformation module 20 is for being electrically connected GOA circuit 30.The constant pressure low potential
VSSG is the pull-down module that scanning signal low potential namely the constant pressure low potential access every level-one GOA unit in GOA circuit 30
And drop-down maintenance module, the scanning signal of every level-one GOA unit is maintained for pulling down and pulling down.
Preferably, the constant pressure low potential VSSG is -5V~-6V.
Specifically, the supply voltage VCC is greater than 0.
It should be noted that voltage conversion circuit of the invention is at work, control signal generator module 10 is by its output
The control terminal transmission of control signals to voltage transformation module 20 is held, voltage transformation module 20 is under control of the control signal to power supply
Voltage VCC is converted to generate constant pressure low potential VSSG and be exported by its output end into GOA circuit, compared with the prior art
In for generating the voltage conversion circuit of scanning signal low potential, the driving capability of voltage conversion circuit of the invention promotes one
The order of magnitude, driving capability is strong, can export stable constant pressure low potential VSSG, it is low to be effectively prevented from scanning signal in the prior art
Electric leakage causes system low potential to pull down scanning signal low potential between current potential and system low potential, effectively guarantees to be used for conduct
The constant pressure low potential VSSG of scanning signal and for pull down and pull down maintain GOA circuit in key node low potential between electricity
Pressure difference, to promote the reliability of GOA circuit with the leakage current being effectively reduced in GOA circuit.
In conclusion voltage conversion circuit of the invention includes control signal generator module and voltage transformation module, control
The output end of signal generator module is electrically connected the control terminal of voltage transformation module, and the input terminal of voltage transformation module accesses power supply
Voltage when work, controls control terminal transmission of control signals of the signal generator module from its output end to voltage transformation module, voltage
Conversion module carries out conversion generation constant pressure low potential to supply voltage under control of the control signal and is exported by its output end, drives
Kinetic force is strong, stable constant pressure low potential can be exported, with the leakage current being effectively reduced in GOA circuit.
The above for those of ordinary skill in the art can according to the technique and scheme of the present invention and technology
Other various corresponding changes and modifications are made in design, and all these change and modification all should belong to the claims in the present invention
Protection scope.
Claims (10)
1. a kind of voltage conversion circuit, which is characterized in that including control signal generator module (10) and voltage transformation module (20)；
The output end of control signal generator module (10) is electrically connected the control terminal of voltage transformation module (20) with to voltage
The control terminal transmission of control signals of conversion module (20)；
The input terminal of the voltage transformation module (20) accesses supply voltage (VCC), under control of the control signal to electricity
Source voltage (VCC) is converted to generate constant pressure low potential (VSSG), and the output end of the voltage transformation module (20) exports permanent
Force down current potential (VSSG).
2. voltage conversion circuit as described in claim 1, which is characterized in that the voltage transformation module (20) includes that switch is single
First (21), inductance (L1), diode (D1) and capacitor (C1)；The control terminal of the switch unit (21) is voltage transformation module
(20) control terminal, first end are the input terminal of voltage transformation module (20), and second end is electrically connected the one end of inductance (L1), institute
Switch unit (21) are stated its first end is turned on or off with second end for the control of suspension control signal；The inductance (L1)
The other end ground connection；The cathode of the diode (D1) is electrically connected the one end of inductance (L1), and anode is voltage transformation module
(20) output end；One end of the capacitor (C1) is electrically connected the anode of diode (D1), other end ground connection.
3. voltage conversion circuit as claimed in claim 2, which is characterized in that the voltage transformation module (20) further includes resistance
(R1)；The both ends of capacitor (C1) are electrically connected in the both ends of the resistance (R1).
4. voltage conversion circuit as claimed in claim 2, which is characterized in that the diode (D1) is Schottky diode.
5. voltage conversion circuit as claimed in claim 4, which is characterized in that the maximum peak value repeatedly of the diode (D1) is anti-
It is 40V to voltage, the average switching current of maximum is 2A.
6. voltage conversion circuit as claimed in claim 2, which is characterized in that the switch unit (21) is field-effect tube
(Q1)；The grid of the field-effect tube (Q1) is the control terminal of switch unit (21), and source electrode and drain electrode are respectively switch unit
(21) first end and second end.
7. voltage conversion circuit as described in claim 1, which is characterized in that the control signal generator module (10) is power supply
Managing chip.
8. voltage conversion circuit as described in claim 1, which is characterized in that the output end of the voltage transformation module (20) is used
In electric connection GOA circuit (30)；The constant pressure low potential (VSSG) is scanning signal low potential.
9. voltage conversion circuit as claimed in claim 8, which is characterized in that the constant pressure low potential (VSSG) be -5V~-
6V。
10. voltage conversion circuit as described in claim 1, which is characterized in that the supply voltage (VCC) is greater than 0.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910364451.6A CN110086337A (en) | 2019-04-30 | 2019-04-30 | Voltage conversion circuit |
| PCT/CN2019/092725 WO2020220449A1 (en) | 2019-04-30 | 2019-06-25 | Voltage conversion circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910364451.6A CN110086337A (en) | 2019-04-30 | 2019-04-30 | Voltage conversion circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110086337A true CN110086337A (en) | 2019-08-02 |
Family
ID=67418333
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910364451.6A Pending CN110086337A (en) | 2019-04-30 | 2019-04-30 | Voltage conversion circuit |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN110086337A (en) |
| WO (1) | WO2020220449A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114223126A (en) * | 2019-08-23 | 2022-03-22 | 三菱电机株式会社 | Power conversion control device |
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| CN1242925A (en) * | 1997-01-03 | 2000-01-26 | 艾利森电话股份有限公司 | Driver circuit, and method for operating same |
| CN102983744A (en) * | 2012-12-25 | 2013-03-20 | 深圳市华星光电技术有限公司 | DC/DC module for LCD driving circuit |
| CN104933987A (en) * | 2015-05-29 | 2015-09-23 | 京东方科技集团股份有限公司 | Power circuit for supplying power to organic light-emitting diode, and display panel |
| CN105375762A (en) * | 2015-12-15 | 2016-03-02 | 深圳市华星光电技术有限公司 | Buck-boost conversion circuit, power source management module and liquid crystal drive device |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1014256A (en) * | 1996-06-27 | 1998-01-16 | Toshiba Corp | Power conversion device |
| TWI497883B (en) * | 2013-08-14 | 2015-08-21 | Beyond Innovation Tech Co Ltd | Boost apparatus with over-current and over-voltage protection function |
| CN103761953B (en) * | 2014-01-28 | 2016-04-06 | 北京京东方显示技术有限公司 | A kind of indicative control unit and display device |
| CN204794074U (en) * | 2015-07-15 | 2015-11-18 | 长城信息产业股份有限公司 | Constant voltage source among electric current voltage conversion circuit makes can circuit |
| CN108962165B (en) * | 2018-07-18 | 2021-08-31 | 南京熊猫电子制造有限公司 | Circuit and method for eliminating power-down residual image of IGZO display panel |
| CN109510463A (en) * | 2018-11-12 | 2019-03-22 | 浙江工业大学 | The continuous buck DC-DC converter of input and output electric current |
-
2019
- 2019-04-30 CN CN201910364451.6A patent/CN110086337A/en active Pending
- 2019-06-25 WO PCT/CN2019/092725 patent/WO2020220449A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1242925A (en) * | 1997-01-03 | 2000-01-26 | 艾利森电话股份有限公司 | Driver circuit, and method for operating same |
| CN102983744A (en) * | 2012-12-25 | 2013-03-20 | 深圳市华星光电技术有限公司 | DC/DC module for LCD driving circuit |
| CN104933987A (en) * | 2015-05-29 | 2015-09-23 | 京东方科技集团股份有限公司 | Power circuit for supplying power to organic light-emitting diode, and display panel |
| CN105375762A (en) * | 2015-12-15 | 2016-03-02 | 深圳市华星光电技术有限公司 | Buck-boost conversion circuit, power source management module and liquid crystal drive device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114223126A (en) * | 2019-08-23 | 2022-03-22 | 三菱电机株式会社 | Power conversion control device |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2020220449A1 (en) | 2020-11-05 |
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Application publication date: 20190802 |
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