CN205986618U - Power supply circuit - Google Patents
Power supply circuit Download PDFInfo
- Publication number
- CN205986618U CN205986618U CN201620915710.1U CN201620915710U CN205986618U CN 205986618 U CN205986618 U CN 205986618U CN 201620915710 U CN201620915710 U CN 201620915710U CN 205986618 U CN205986618 U CN 205986618U
- Authority
- CN
- China
- Prior art keywords
- electric capacity
- power supply
- changeover device
- supply changeover
- power circuit
- 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.)
- Active
Links
Landscapes
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The utility model provides a power supply circuit, include: power converter's messenger can receive external control signal by the termination, and outside reference voltage, power converter's earthing terminal ground connection is received to power converter's reference voltage input, the first end electricity of first electric capacity is connected to power converter's first positive terminal, and the second end electricity of first electric capacity is connected to power converter's first negative pole end, the first end electricity of second electric capacity is connected to power converter's second positive terminal, and the second end electricity of second electric capacity is connected to power converter's second negative pole end, the first end electricity of third electric capacity is connected to power converter's third positive terminal, and the second end electricity of third electric capacity is connected to power converter's third negative pole end, when the messenger can hold received external control signal to be the high level, power converter's positive voltage output end output forward analog voltage and power converter's negative voltage output end output negative sense analog voltage to drive liquid crystal disply device carries out image display, and circuit structure is simple, and is with low costs.
Description
Technical field
This utility model is related to power supply technique field, more particularly, to power circuit.
Background technology
Vertically displaying screen in liquid crystal indicator generally requires positive negative sense analog voltage VSP/VSN or AVDD/ at present
AVEE is powered, to drive liquid crystal indicator to be shown it will usually adopt discrete component circuit just to produce on mainboard
Negative sense analog voltage.Fig. 1 is the schematic diagram of the circuit structure of power circuit of prior art.As shown in figure 1, power supply chip U1 '
Reference voltage input terminal VIN and Enable Pin EN receive external reference voltage VDD respectively, and by the first electric capacity C10 ' ground connection, electricity
The switch control terminal SW of source chip U1 ' is electrically connected with the anode of the first diode D1 ', and the first end of inductance L1 ' receives outward respectively
Second end of portion reference voltage VDD, inductance L1 ' is electrically connected to the anode of the first diode D1 ', so that the first diode D1 '
The positive analog voltage VSP of negative electrode output, the negative electrode of the first diode D1 ' is also respectively via first resistor R1 ' and second resistance R2 '
After be grounded, one end of the second electric capacity C11 ' is electrically connected with second end of inductance L1 ', and the other end of the second electric capacity C11 ' is electrically connected to
The negative electrode of the second diode D2 ' and the anode of the 3rd diode D3 ', the negative electrode of the second diode D2 ' and the 3rd diode D3's '
Anode electrically connects, and the negative electrode of the 3rd diode D3 ' is electrically connected with the anode of the second diode D2 ' via the 3rd electric capacity C12 ', the
Three resistance R3 ' are grounded with the 3rd electric capacity C12 ', thus exporting negative sense analog voltage VSN, the first end electricity of the 4th electric capacity C13 '
Connect to the negative electrode of the first diode D1 ', the second end ground connection of the 4th electric capacity C13 '.
But foregoing circuit, because diode and the electronic devices and components such as inductance, complex structure need to be used, and increased mainboard
Cost, and foregoing circuit only one of which Enable Pin, its application compares limitation it is difficult to realize many of coupling different liquid crystal displays dress
The timing requirements of the drive circuit put.
Utility model content
In view of this, this utility model purpose is to provide a kind of power circuit it is only necessary to by power supply changeover device and capacitance group
The circuit becoming just enables to export the positive negative sense analog voltage that vertically displaying screen needs, and circuit structure is simple, low cost.
Specifically, this utility model embodiment provides a kind of power circuit, and described power circuit is used for providing liquid crystal display
The positive negative sense analog voltage of device, described power circuit includes：Power supply changeover device, the first electric capacity, the second electric capacity and the 3rd electric capacity；
The Enable Pin of described power supply changeover device receives external control signal, and the reference voltage input terminal of described power supply changeover device receives outside
Reference voltage, the earth terminal ground connection of described power supply changeover device；The first end of described first electric capacity is electrically connected to described Power convert
First positive terminal of device, the second end of described first electric capacity is electrically connected to the first negative pole end of described power supply changeover device；Described
The first end of two electric capacity is electrically connected to the second positive terminal of described power supply changeover device, and the second end of described second electric capacity is electrically connected to
Second negative pole end of described power supply changeover device；The first end of described 3rd electric capacity is just being electrically connected to the 3rd of described power supply changeover device
Extremely, the second end of described 3rd electric capacity is electrically connected to the 3rd negative pole end of described power supply changeover device；When described Enable Pin receives
When the external control signal arriving is high level, the positive analog voltage of positive voltage output end output of described power supply changeover device and described
The negative voltage outfan output negative sense analog voltage of power supply changeover device, is shown with driving described liquid crystal indicator to carry out picture.
Specifically, described power circuit also includes the 4th electric capacity, and the first end of described 4th electric capacity is electrically connected to described ginseng
Examine voltage input end, the second end ground connection of described 4th electric capacity.
Specifically, described power circuit also includes the 5th electric capacity, the first end of described 5th electric capacity be electrically connected to described just
Voltage output end, the second end ground connection of described 5th electric capacity.
Specifically, described power circuit also includes the 6th electric capacity, and the first end of described 6th electric capacity is electrically connected to described bearing
Voltage output end, the second end ground connection of described 6th electric capacity.
Specifically, the sequencing contro end of described power circuit receives external timing signal.
Specifically, the frequency of described external timing signal is more than predeterminated frequency value.
Specifically, the sequencing contro end ground connection of described power circuit.
The power circuit that the present embodiment provides, produces, by power supply changeover device, the positive negative sense simulation electricity that vertically displaying screen needs
Laminate section circuit design is on the FPC/PCBA in liquid crystal indicator, and is directly produced it is only necessary to by power supply by power supply changeover device
Transducer just enables to export portrait layout positive negative sense analog voltage with the circuit of electric capacity composition, and circuit structure is simple, low cost, simultaneously
Signal can be enabled by the drive circuit output in liquid crystal indicator flexibly controls power supply changeover device to be turned on and off, and can
Freely control the operating frequency of power supply changeover device, improve capacity of resisting disturbance and there is broad applicability.
What the present embodiment provided is that above and other objects, features and advantages of the present utility model can be become apparent,
Preferred embodiment cited below particularly, and coordinate institute's accompanying drawings, it is described in detail below.
Brief description
Fig. 1 is the schematic diagram of the circuit structure of power circuit of prior art.
The schematic diagram of the circuit structure of the power circuit that Fig. 2 provides for this utility model embodiment.
Fig. 3 is the construction module schematic diagram of power supply changeover device in Fig. 2.
Specific embodiment
For further illustrating that this utility model is to realize technological means and effect that expected purpose is taken, below in conjunction with
Accompanying drawing and preferred embodiment, to according to the utility model proposes the specific embodiment of power circuit, method, step, structure,
Feature and effect, after describing in detail such as.
About of the present utility model aforementioned and other technology contents, feature and effect, coordinate with reference to schema relatively following
Can clearly present in the detailed description of good embodiment.By the explanation of specific embodiment, when to this utility model being
Reach the technological means that expected purpose taken and effect be able to more deeply and specific understand, but institute's accompanying drawings only carry
For reference with purposes of discussion, not it is used for this utility model is any limitation as.
Please one with reference to Fig. 2 and Fig. 3, the circuit structure of the power circuit that Fig. 2 provides for this utility model first embodiment
Schematic diagram, Fig. 3 is the construction module schematic diagram of power supply changeover device U1 in Fig. 2.This power circuit is used for providing liquid crystal indicator
Portrait layout positive negative sense analog voltage, as shown in Figure 2 and Figure 3, power circuit include power supply changeover device U1, the first electric capacity C1, second
Electric capacity C2 and the 3rd electric capacity C3.This power circuit can be mounted on FPC or PCBA in liquid crystal indicator, with to liquid crystal
Display screen provides positive negative sense analog voltage.
In this utility model one embodiment, power circuit also includes the 4th electric capacity C4, the 5th electric capacity C5 and the 6th electricity
Hold C6.
Specifically, power supply changeover device U1 includes control module 12, positive charge pump module 14 and negative charge pump module 16.This control
Molding block 12 is respectively electrically connected to positive charge pump module 14 and negative charge pump module 16.Control module 12 is used for controlling positive charge pump
Module 14 presses certain operating frequency work, so that this positive charge pump module 14 exports positive analog voltage AVDD/VSP.Control
Module 12 is additionally operable to control negative charge pump module 16 to work by certain operating frequency, so that the output of this negative charge pump module 16 is negative
To analog voltage AVEE/VSN.
Enable Pin EN of power supply changeover device U1 receives external control signal, and this external control signal is transmitted to control mould
Block 12.The reference voltage input terminal of power supply changeover device U1 receives external reference voltage VCI/VIN, and reference voltage input terminal electrically connects
To the first end of the 4th electric capacity C4, the second end ground connection of the 4th electric capacity C4, external reference voltage VCI/VIN is transmitted separately to
Positive charge pump module 14 and negative charge pump module 16, and can reduce in the supply-injected circuit of noise, power supply changeover device U1 connects
Ground terminal is grounded.The positive voltage output end of power supply changeover device U1 is electrically connected to the first end of the 5th electric capacity C5, and the of the 5th electric capacity C5
Two end ground connection.The negative voltage outfan of power supply changeover device U1 is electrically connected to the first end of the 6th electric capacity C6, and the of the 6th electric capacity C6
Two end ground connection.Specifically, in the present embodiment, the sequencing contro end PSYNC/CLK of power supply changeover device U1 receives external clock letter
Number CLK, wherein, the frequency of this external timing signal CLK is more than predeterminated frequency value, wherein, predeterminated frequency in one embodiment
Value is desirable to be more than or equal to 50Hz, so that positive charge pump module 14 and negative charge pump module 16 are according to external timing signal CLK
Frequency work, realize the controlled purpose of operating frequency, but be not limited thereto, for example, in other embodiments, power supply turns
The sequencing contro end PSYNC/CLK of parallel operation U1 can also be grounded, so that positive charge pump module 14 and negative charge pump module 16
Fixed frequency work according to power supply changeover device U1.Wherein, power supply changeover device U1 can be, but not limited to the electricity of model AAT7517B
Source chip, for example in other embodiments, power supply changeover device U1 can also be using the power supply chip of other models.
Specifically, in the present embodiment, the first end of the first electric capacity C1 is electrically connected to the first of described power supply changeover device U1
Second end of positive terminal C1P, the first electric capacity C1 is electrically connected to the first negative pole end C1N of power supply changeover device U1, so that positive charge
The input of the first boosting unit of pump module 14 is electrically connected with the first end of the first electric capacity C1, the outfan of the first boosting unit
Electrically connect with second end of the first electric capacity C1 so that the first boosting unit according to the control signal of control module 12 by outside
Reference voltage VCI/VIN is boosted.The first end of the second electric capacity C2 is electrically connected to second positive pole of described power supply changeover device U1
End C2P, second end of the second electric capacity C2 is electrically connected to the second negative pole end C2N of described power supply changeover device U1, so that positive charge
The input of the second boosting unit of pump module 14 is electrically connected with the first end of the second electric capacity C2, the outfan of the second boosting unit
Electrically connect with second end of the second electric capacity C2, so that the second boosting unit will pass through according to the control signal of control module 12
The voltage of the first boosting unit boosting is boosted again, and then makes the outfan of positive charge pump module 14 export positive simulation
Voltage AVDD/VSP, but it is not limited to this, for example positive simulation electricity can also be obtained by once boosting in other embodiments
Pressure AVDD/VSP.
Specifically, in the present embodiment, the first end of the 3rd electric capacity C3 is electrically connected to the 3rd positive pole of power supply changeover device U1
End C3P, second end of the 3rd electric capacity C3 is electrically connected to the 3rd negative pole end C3N of power supply changeover device U1, so that negative charge pump mould
The input of the rp unit of block 16 is electrically connected with the first end of the 3rd electric capacity C3, the outfan of rp unit and the 3rd electric capacity C3
Second end electrical connection so that rp unit is exported with aligning electric charge pump module 14 according to the control signal of control module 12
Forward voltage AVDD/VSP is carried out reversely, and then makes the outfan of negative charge pump module 16 export negative sense analog voltage AVEE/
VSN.
When the external control signal that Enable Pin EN receives is high level, when control module 12 receives external timing signal
During CLK, control module 12 controls positive charge pump module 14 and negative charge pump module 16 to be entered according to the frequency of external timing signal CLK
Row work, when control module 12 receives the inside fixed frequency of power supply changeover device U1, control module 12 controls positive charge pump
Module 14 and negative charge pump module 16 are operated according to fixed frequency, so that the positive voltage output end of power supply changeover device U1
The negative voltage outfan output negative sense analog voltage AVEE/VSN of the positive analog voltage AVDD/VSP and power supply changeover device U1 of output,
Shown with driving described liquid crystal indicator to carry out picture.Due in one embodiment, positive/negative electric charge pump module can be according to electricity
The frequency of the clock signal of the inside fixed frequency of source converter U1 or outside is operated, thus positive/negative electric charge pump module
Operating frequency adjustable, and then enable power circuit to mate the timing requirements of different drive circuits.
When the external control signal that Enable Pin EN receives is low level, power circuit does not work, thus not exporting vertical
Positive negative sense analog voltage required for display screen.
It follows that the power circuit that the present embodiment provides, portrait layout positive negative sense simulation electricity is produced by power supply changeover device U1
Laminate section circuit design is on the FPC/PCBA in liquid crystal indicator, and is directly produced by power supply changeover device U1, circuit structure
Simple it is only necessary to the circuit that is made up of with electric capacity power supply changeover device U1 just enables output portrait layout positive negative sense analog voltage, low cost,
Signal can be enabled by the drive circuit output in liquid crystal indicator flexibly controls power supply changeover device U1 to be turned on and off simultaneously, with
And can freely control the operating frequency of power supply changeover device U1, improve capacity of resisting disturbance and there is broad applicability.
The above, be only preferred embodiment of the present utility model, not this utility model is made any formal
Restriction although this utility model is disclosed above with preferred embodiment, but be not limited to utility model, any be familiar with
Professional and technical personnel, in the range of without departing from utility model technical scheme, when the technology contents of available the disclosure above are made
Go out a little Equivalent embodiments changing or be modified to equivalent variations, as long as being without departing from utility model technical scheme content, foundation
Any simple modification, equivalent variations and modification that the technical spirit of utility model is made to above example, all still fall within this reality
In the range of new technique scheme.
Claims (7)
1. a kind of power circuit, described power circuit is used for providing the positive negative sense analog voltage of liquid crystal indicator, and its feature exists
In described power circuit includes：Power supply changeover device, the first electric capacity, the second electric capacity and the 3rd electric capacity；
The Enable Pin of described power supply changeover device receives external control signal, and the reference voltage input terminal of described power supply changeover device receives
External reference voltage, the earth terminal ground connection of described power supply changeover device；
The first end of described first electric capacity is electrically connected to the first positive terminal of described power supply changeover device, and the second of described first electric capacity
End is electrically connected to the first negative pole end of described power supply changeover device；
The first end of described second electric capacity is electrically connected to the second positive terminal of described power supply changeover device, and the second of described second electric capacity
End is electrically connected to the second negative pole end of described power supply changeover device；
The first end of described 3rd electric capacity is electrically connected to the 3rd positive terminal of described power supply changeover device, and the second of described 3rd electric capacity
End is electrically connected to the 3rd negative pole end of described power supply changeover device；
When the external control signal that described Enable Pin receives is high level, the positive voltage output end of described power supply changeover device is defeated
Go out the negative voltage outfan output negative sense analog voltage of positive analog voltage and described power supply changeover device, to drive described liquid crystal
Showing device carries out picture and shows.
2. power circuit as claimed in claim 1 is it is characterised in that described power circuit also includes the 4th electric capacity, and described
The first end of four electric capacity is electrically connected to described reference voltage input terminal, the second end ground connection of described 4th electric capacity.
3. power circuit as claimed in claim 1 is it is characterised in that described power circuit also includes the 5th electric capacity, and described
The first end of five electric capacity is electrically connected to described positive voltage output end, the second end ground connection of described 5th electric capacity.
4. power circuit as claimed in claim 1 is it is characterised in that described power circuit also includes the 6th electric capacity, and described
The first end of six electric capacity is electrically connected to described negative voltage outfan, the second end ground connection of described 6th electric capacity.
5. power circuit as claimed in claim 1 is it is characterised in that when the sequencing contro end of described power circuit receives outside
Clock signal.
6. power circuit as claimed in claim 5 is it is characterised in that the frequency of described external timing signal is more than predeterminated frequency
Value.
7. power circuit as claimed in claim 1 is it is characterised in that the sequencing contro end of described power circuit is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620915710.1U CN205986618U (en) | 2016-08-22 | 2016-08-22 | Power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620915710.1U CN205986618U (en) | 2016-08-22 | 2016-08-22 | Power supply circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205986618U true CN205986618U (en) | 2017-02-22 |
Family
ID=58032589
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620915710.1U Active CN205986618U (en) | 2016-08-22 | 2016-08-22 | Power supply circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205986618U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111223462A (en) * | 2020-02-21 | 2020-06-02 | 湖北亿咖通科技有限公司 | Liquid crystal display screen drive circuit |
-
2016
- 2016-08-22 CN CN201620915710.1U patent/CN205986618U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111223462A (en) * | 2020-02-21 | 2020-06-02 | 湖北亿咖通科技有限公司 | Liquid crystal display screen drive circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102063877B (en) | LCD (Liquid Crystal Display) and detecting method thereof | |
| CN104464673B (en) | Display device and its control method, circuit | |
| CN103474018B (en) | Power supply circuit of display device | |
| CN107274850B (en) | A kind of display driver circuit and its driving method, display device | |
| CN109285526A (en) | Charging circuit, display panel driving circuit and display device | |
| CN101604515B (en) | Discharge circuit and display device with the same | |
| CN104753340B (en) | charge pump capable of adjusting output voltage | |
| CN102751868B (en) | Voltage converter | |
| CN103198807A (en) | Display signal processing system and circuit board and liquid crystal display device | |
| CN1953030A (en) | Control circuit device and liquid crystal display with the same | |
| CN104156106A (en) | Touch device and driving method thereof | |
| CN100444239C (en) | Display apparatus and portable terminal | |
| CN110264971A (en) | Anti- splashette circuit and method, driving circuit, display device | |
| CN205986618U (en) | Power supply circuit | |
| CN205986619U (en) | Power supply circuit and liquid crystal display apparatus | |
| CN104167186B (en) | LED backlight and liquid crystal display for liquid crystal display | |
| CN104518662A (en) | Half-voltage ratio charge-pump circuit | |
| CN104795029B (en) | Gate driver and circuit buffer thereof | |
| CN103105712B (en) | Display module and liquid crystal display | |
| CN104299588B (en) | Grid drive circuit, grid drive method and display device | |
| CN101692324B (en) | Timing controller with built-in voltage stabilizing circuit function | |
| CN106300492B (en) | power supply system and display device | |
| CN101295470A (en) | Gamma voltage output circuit | |
| CN104935161A (en) | Timing control (TCON) power supply management circuit for onboard display screen | |
| CN206379936U (en) | Multi signal change-over circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |