CN205986619U - Power supply circuit and liquid crystal display apparatus - Google Patents
Power supply circuit and liquid crystal display apparatus Download PDFInfo
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- CN205986619U CN205986619U CN201620913513.6U CN201620913513U CN205986619U CN 205986619 U CN205986619 U CN 205986619U CN 201620913513 U CN201620913513 U CN 201620913513U CN 205986619 U CN205986619 U CN 205986619U
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Abstract
The utility model provides a power supply circuit, second end via the first diode analog output voltage of outside reference voltage, inductance is received to the first termination of the inductance in the power management circuit, outside reference voltage is received to the reference voltage input of power manager, the on -off control of power manager holds the electric positive pole of first diode, the input of positive charge pump circuit and the input of negative electrical charge pump of being connected to respectively, and the feedback end electricity of power manager is connected to first resistance, and the compensation end electricity of power manager is connected to the first end of third resistance, and the second of third resistance is held via the second capacity ground, the positive charge pump circuit for output grid cut in voltage, the negative electrical charge pump circuit for the output grid turn -offs voltage, the first end and the cathodic electricity of first diode of bleeder circuit's fourth resistance are connected, and NULL voltage is exported to the second end of fourth resistance. The utility model discloses still provide liquid crystal disply device. The utility model discloses a power supply circuit and liquid crystal display apparatus simple structure, it is with low costs.
Description
Technical field
This utility model is related to power supply technique field, more particularly, to power circuit and the liquid crystal with described power circuit
Showing device.
Background technology
The power circuit of liquid crystal indicator provides analog power voltage (AVDD), and bias such as gate turn-on voltage
The voltages such as VGH, gate off voltage VGL, and public electrode voltages VCOM, are shown with driving liquid crystal indicator to carry out picture
Show.Therefore, the power circuit of liquid crystal indicator is indispensable part in liquid crystal display device drive circuit, and it produces electricity
The quality of source and bias has direct impact to the display quality of liquid crystal indicator and electromagnetic compatibility (EMC) characteristic.
The power circuit of liquid crystal indicator is mainly by booster switcher voltage-stabilized power supply circuit (Boost Switcher at present
Regulator) form with charge pump (Charge Bump) circuit.Wherein, booster switcher voltage-stabilized power supply circuit part produces and drives
Dynamic supply voltage such as analog power voltage AVDD, charge pump circuit produce liquid crystal indicator gate turn-on voltage VGH and
Gate off voltage VGL.
Boost framework in power circuit in prior art adopts the power supply chip of model ANX6623AAQ to realize, and
This power supply chip cost is relatively higher, and the peripheral circuit complex structure that this power supply chip needs, and electronic devices and components number is more,
In FPC/PCBA material object, circuit cabling is complicated, leads to FPC/PCBA holistic cost of a relatively high.
Utility model content
In view of this, this utility model purpose is to provide a kind of power circuit and liquid crystal indicator, employs less
Electronic devices and components just can provide liquid crystal indicator work required bias voltage, structure is simple, low cost.
Specifically, this utility model embodiment provides a kind of power circuit, and described power circuit includes：Power management electricity
Road, positive charge pump circuit, negative charge pump circuit and bleeder circuit；Described electric power management circuit includes boosting unit and power management
Device；Described boosting unit includes an inductance and the first diode, and the first end of described inductance receives external reference voltage, described electricity
Second end of sense is electrically connected to the anode of described first diode, so that the negative electrode output simulation electricity of described first diode
Pressure, the negative electrode of described first diode is grounded via after first resistor and second resistance, and the negative electrode of described first diode is also electric
Connect to the input of bleeder circuit；The reference voltage input terminal of described power supervisor receives external reference voltage, described ginseng
Examine voltage input end also via the first capacity earth, the switch control terminal of described power supervisor is electrically connected to described one or two pole
The anode of pipe, described switch control terminal is also respectively electrically connected to the input of described positive charge pump circuit and described negative charge pump
Input, the feedback end of described power supervisor is electrically connected with described first diode via described first resistor, described power supply
The compensation end of manager is electrically connected to the first end of 3rd resistor, and the second end of described 3rd resistor is via the second capacity earth；
Described positive charge pump circuit, for exporting gate turn-on voltage；Described negative charge pump circuit, for exporting gate off voltage；
The first end of the 4th resistance of described bleeder circuit is electrically connected with the negative electrode of described first diode, and the second of described 4th resistance
End output public electrode voltages, the second end of described 4th resistance is also via the 5th resistance eutral grounding.
Specifically, described electric power management circuit also includes the 3rd electric capacity and filter unit；Described external reference voltage via
Described 3rd capacity earth；Described filter unit includes the 4th electric capacity, the 5th electric capacity and the 6th electric capacity, described 4th to the 6th electricity
Hold and be connected in parallel respectively, the input of described filter unit is electrically connected to the negative electrode of described first diode, described filter unit
Output head grounding.
Specifically, described positive charge pump circuit includes the second diode, the 3rd diode, the 7th electric capacity and the 8th electric capacity；
The first end of described 7th electric capacity is electrically connected to the second end of described inductance, and the second end of described 7th electric capacity is electrically connected to described
The anode of the 3rd diode, the negative electrode output gate turn-on voltage of described 3rd diode, the negative electrode warp of described 3rd diode
By described 8th capacity earth, the anode of described second diode is electrically connected to the negative electrode of described first diode, and described second
The negative electrode of diode is electrically connected to the anode of described 3rd diode.
Specifically, described negative charge pump circuit includes the 9th electric capacity, the 4th diode, the 5th diode and the tenth electric capacity；
The first end of described 9th electric capacity is electrically connected to the second end of described inductance, and the second end of described 9th electric capacity is electrically connected to described
The negative electrode of the 4th diode, the anode of described 4th diode is electrically connected to the first end of described tenth electric capacity, described tenth electricity
The the second end ground connection held, the negative electrode of described 4th diode is electrically connected to the anode of described 5th diode, described five or two pole
The minus earth of pipe, the first end output gate off voltage of described tenth electric capacity.
Specifically, the first end of described first resistor is electrically connected to the negative electrode of described first diode, described first resistor
The second end be grounded via described second resistance, the second end of described first resistor is also electrically connected to described feedback end.
Specifically, described first diode is Xiao Jite diode.
This utility model also provides a kind of liquid crystal indicator it is characterised in that described liquid crystal indicator is included as above
Described power circuit.
The power circuit that the present embodiment provides, by power supervisor framework boost circuit structure, its encapsulation is simple, and electricity
Source control advantage of lower cost, meanwhile, required electronic devices and components are few, and structure is simple, facilitates circuit cabling layout, so as to
Enough reduce the processing cost of power circuit.
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
The schematic diagram of the circuit structure of the power circuit that Fig. 1 provides for this utility model embodiment.
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 power circuit 100 and liquid crystal indicator specific embodiment party
Formula, 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.
Refer to Fig. 1, the schematic diagram of the circuit structure of the power circuit 100 that Fig. 1 provides for this utility model embodiment.As
Shown in Fig. 1, power circuit 100 includes electric power management circuit 10, positive charge pump circuit 20, negative charge pump circuit 30 and bleeder circuit
40.Described electric power management circuit 10 is electrically connected with described positive charge pump circuit 20, negative charge pump circuit 30 and bleeder circuit 40 respectively
Connect, so that electric power management circuit 10 output analog voltage AVDD, positive charge pump circuit 20 output gate turn-on voltage VGH,
Negative charge pump circuit 30 exports gate off voltage VGL, and bleeder circuit 40 exports public electrode voltages VCOM.
Specifically, in one's own profession embodiment, electric power management circuit 10 includes boosting unit and power management U1 device.Boosting is single
Unit includes an inductance L1 and the first diode D1, but this utility model is not limited thereto.
In this utility model one embodiment, power management U1 circuit 10 also includes the 3rd electric capacity C3 and filter unit.
Specifically, the first end of this inductance L1 receives external reference voltage VIN, and second end of this inductance L1 is electrically connected to the
The anode of one diode D1, so that the negative electrode output analog voltage AVDD of the first diode D1.The negative electrode of the first diode D1
It is grounded via after first resistor R1 and second resistance R2, specifically, the negative electrode of the first diode D1 is electrically connected to first resistor R1
First end, first resistor R1 second end electrically connect second resistance R2 first end, second resistance R2 second end ground connection.The
The negative electrode of one diode D1 is also electrically connected to the input of bleeder circuit 40, so that the outfan output of bleeder circuit 40 is public
Electrode voltage VCOM.Wherein, the first diode D1 can be, but not limited to Xiao Jite diode, the model of the first diode D1
BAT760-7, but it is not limited to this.
Filter unit includes the 4th electric capacity C4, the 5th electric capacity C5 and the 6th electric capacity C6.4th to the 6th electric capacity C4-C6 is respectively
It is connected in parallel, that is, the first end of the 4th to the 6th electric capacity C4-C6 is respectively electrically connected to the negative electrode of the first diode D1, the 4th to
Second end of six electric capacity C4-C6 is grounded respectively.The input of filter unit is electrically connected to the negative electrode of described first diode D1, filter
The output head grounding of ripple unit, thus play the effect of burning voltage.
The reference voltage input terminal VDD of power management U1 device receives external reference voltage VIN, reference voltage input terminal VDD
Also it is grounded via the first electric capacity C1.Further, reference voltage input terminal VDD is also electrically connected to the first end of the 3rd electric capacity C3,
The second end ground connection of the 3rd electric capacity C3, thus reduce noise be injected in power management U1 circuit 10.The opening of power management U1 device
Close the anode that control end SW is electrically connected to the first diode D1, thus controlling the negative electrode of the first diode D1 to export analog voltage
AVDD.Switch control terminal SW is also respectively electrically connected to the input of positive charge pump circuit 20 and the input of negative charge pump circuit 30
End, thus controlling positive charge pump circuit 20 output gate turn-on voltage VGH, negative charge pump circuit 30 exports gate off voltage
VGL.The feedback end FB of power management U1 device electrically connect with the first diode D1 via first resistor R1 it is to be understood that electricity
The feedback end FB of source control U1 device is electrically connected to the second end of first resistor R1.The compensation end EO of power management U1 device is electrically connected to
The first end of 3rd resistor R3, the second end of 3rd resistor R3 is grounded via the second electric capacity C2, to reach the effect of voltage compensation,
Power management U1 circuit 10 is made to export more stable voltage.Wherein, in one embodiment, power management U1 device can but not
It is limited to the power supply chip of model AAT7412-S5-T, for example, can also use the power supply core of other models in other embodiments
Piece.
Specifically, the first end of the 4th resistance R4 of bleeder circuit 40 is electrically connected with the negative electrode of the first diode D1, thus
Make second end output public electrode voltages VCOM of the 4th resistance R4.Further, the second end electrical connection of the 4th resistance R4
To the first end of the 5th resistance R5, the second end ground connection of the 5th resistance R5.
Positive charge pump circuit 20 includes the second diode D2, the 3rd diode D3, the 7th electric capacity C7 and the 8th electric capacity C8.Tool
Body ground, the first end of the 7th electric capacity C7 is electrically connected to second end of inductance L1, and second end of the 7th electric capacity C7 is electrically connected to the 3rd
The anode of diode D3.Negative electrode output gate turn-on voltage VGH of the 3rd diode D3, the negative electrode of the 3rd diode D3 is via the
Eight electric capacity C8 ground connection, so that one end output gate turn-on voltage VGH of the 8th electric capacity C8.The anode electricity of the second diode D2
Connect to the negative electrode of the first diode D1, the negative electrode of the second diode D2 is electrically connected to the anode of the 3rd diode D3.Wherein,
2nd, three diode D2, D3 can be, but not limited to Xiao Jite diode, in one embodiment, the second diode D2 and the three or two
Pole pipe D3 can be a diode group, such as model BAT54 of this diode group, but is not limited thereto.
Negative charge pump circuit 30 includes the 9th electric capacity C9, the 4th diode D4, the 5th diode D5 and the tenth electric capacity C10.
Specifically, the first end of the 9th electric capacity C9 is electrically connected to second end of inductance L1, and second end of the 9th electric capacity C9 is electrically connected to
The negative electrode of four diode D4.The anode of the 4th diode D4 is electrically connected to the first end of the tenth electric capacity C10, the tenth electric capacity C10's
Second end ground connection.The negative electrode of the 4th diode D4 is electrically connected to the anode of the 5th diode D5, and the negative electrode of the 5th diode D5 connects
Ground, thus first end output gate off voltage VGL of the tenth electric capacity C10.Wherein, fourth, fifth diode D4, D5 can but not
It is limited to Xiao Jite diode, in one embodiment, the 4th diode D4 and the 5th diode D5 can be a diode group, example
As model BAT54 of this diode group, but it is not limited thereto.
Further, in an embodiment of the present utility model, power management U1 circuit 10 also includes the 11st electric capacity
(not shown) and the 12nd electric capacity (not shown), positive charge pump circuit 20 also includes the 6th resistance (not shown), negative electricity
Lotus pump circuit 30 also includes the 7th resistance (not shown).Specifically, the first end of the 11st electric capacity is electrically connected to the one or two pole
The negative electrode of pipe D1, the second end of the 11st electric capacity is electrically connected to the first end of second resistance R2.The first end electricity of the 12nd electric capacity
Connect to the first end of 3rd resistor R3, the second end ground connection of the 12nd electric capacity.First end electrical connection the 8th electricity of the 6th resistance
Hold the first end of C8, the second end of the 6th resistance is electrically connected to second end of the 8th electric capacity C8.The first end of the 7th resistance is electrically connected
Connect the first end of the tenth electric capacity C10, the second end of the 7th resistance is electrically connected to second end of the tenth electric capacity C10.
Further, this utility model embodiment also provides a kind of liquid crystal indicator, this liquid crystal indicator include as
Upper described power circuit 100.
Specifically, power circuit 100 utilizes the external reference voltage VIN that reference voltage input terminal VDD receives, so that
Boosting unit output analog voltage AVDD is to provide pixel voltage on the data wire to liquid crystal indicator, and then bleeder circuit
The analog voltage AVDD of 40 pairs of boosting unit outputs carries out partial pressure and obtains the public electrode on glass substrate in liquid crystal indicator
Voltage VCOM.Simultaneously positive charge pump circuit 20 analog voltage AVDD is carried out boosting obtain in scan line in liquid crystal indicator use
In the largest gate cut-in voltage VGH opening TFT, wherein VGH=2*AVDD-2Vd, Vd are second or three diode D2 or D3
Forward conduction voltage.Negative charge pump circuit 30 obtains in scan line in liquid crystal indicator after analog voltage AVDD being carried out reversely
For turning off minimum gate off voltage VGL of TFT, wherein VGL=-AVDD+2Vd, Vd are the 4th or five diode D4 or D5
Forward conduction voltage.
It follows that the power circuit 100 of the present embodiment offer and liquid crystal indicator, by power management U1 device framework
Boost circuit structure, its encapsulation is simple, and power management U1 advantage of lower cost, and meanwhile, required electronic devices and components are few, knot
Structure is simple, facilitates circuit cabling layout such that it is able to reduce the processing cost of power circuit 100.
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 is it is characterised in that described power circuit includes：Electric power management circuit, positive charge pump circuit, negative electricity
Lotus pump circuit and bleeder circuit；
Described electric power management circuit includes boosting unit and power supervisor；
Described boosting unit includes an inductance and the first diode, and the first end of described inductance receives external reference voltage, described
Second end of inductance is electrically connected to the anode of described first diode, so that the negative electrode output simulation electricity of described first diode
Pressure, the negative electrode of described first diode is grounded via after first resistor and second resistance, and the negative electrode of described first diode is also electric
Connect to the input of bleeder circuit；
The reference voltage input terminal of described power supervisor receives external reference voltage, and described reference voltage input terminal is also via the
One capacity earth, the switch control terminal of described power supervisor is electrically connected to the anode of described first diode, described switch control
End processed is also respectively electrically connected to the input of described positive charge pump circuit and the input of described negative charge pump, described power management
The feedback end of device is electrically connected with described first diode via described first resistor, the compensation end electrical connection of described power supervisor
To the first end of 3rd resistor, the second end of described 3rd resistor is via the second capacity earth；
Described positive charge pump circuit, for exporting gate turn-on voltage；
Described negative charge pump circuit, for exporting gate off voltage；
The first end of the 4th resistance of described bleeder circuit is electrically connected with the negative electrode of described first diode, described 4th resistance
Second end output public electrode voltages, the second end of described 4th resistance is also via the 5th resistance eutral grounding.
2. power circuit as claimed in claim 1 is it is characterised in that described electric power management circuit also includes the 3rd electric capacity and filter
Ripple unit；
Described external reference voltage is via described 3rd capacity earth；
Described filter unit includes the 4th electric capacity, the 5th electric capacity and the 6th electric capacity, and described 4th to the 6th electric capacity is in parallel respectively to be connected
Connect, the input of described filter unit is electrically connected to the negative electrode of described first diode, the output head grounding of described filter unit.
3. power circuit as claimed in claim 1 it is characterised in that described positive charge pump circuit include the second diode,
Three diodes, the 7th electric capacity and the 8th electric capacity；
The first end of described 7th electric capacity is electrically connected to the second end of described inductance, and the second end of described 7th electric capacity is electrically connected to
The anode of described 3rd diode, the negative electrode output gate turn-on voltage of described 3rd diode, the moon of described 3rd diode
Via described 8th capacity earth, the anode of described second diode is electrically connected to the negative electrode of described first diode, described for pole
The negative electrode of the second diode is electrically connected to the anode of described 3rd diode.
4. power circuit as claimed in claim 1 it is characterised in that described negative charge pump circuit include the 9th electric capacity, the 4th
Diode, the 5th diode and the tenth electric capacity；
The first end of described 9th electric capacity is electrically connected to the second end of described inductance, and the second end of described 9th electric capacity is electrically connected to
The negative electrode of described 4th diode, the anode of described 4th diode is electrically connected to the first end of described tenth electric capacity, and described
Second end ground connection of ten electric capacity, the negative electrode of described 4th diode is electrically connected to the anode of described 5th diode, and the described 5th
The minus earth of diode, the first end output gate off voltage of described tenth electric capacity.
5. power circuit as claimed in claim 1 is it is characterised in that the first end of described first resistor is electrically connected to described
The negative electrode of one diode, the second end of described first resistor is grounded via described second resistance, the second end of described first resistor
It is also electrically connected to described feedback end.
6. power circuit as claimed in claim 1 is it is characterised in that described first diode is Xiao Jite diode.
7. a kind of liquid crystal indicator is it is characterised in that described liquid crystal indicator is included as any one of claim 1 to 6
Described power circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620913513.6U CN205986619U (en) | 2016-08-22 | 2016-08-22 | Power supply circuit and liquid crystal display apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620913513.6U CN205986619U (en) | 2016-08-22 | 2016-08-22 | Power supply circuit and liquid crystal display apparatus |
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| Publication Number | Publication Date |
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| CN205986619U true CN205986619U (en) | 2017-02-22 |
Family
ID=58033654
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| Application Number | Title | Priority Date | Filing Date |
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| CN201620913513.6U Active CN205986619U (en) | 2016-08-22 | 2016-08-22 | Power supply circuit and liquid crystal display apparatus |
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Cited By (3)
| 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 |
| CN112002290A (en) * | 2020-09-22 | 2020-11-27 | 浙江鸿泉电子科技有限公司 | Liquid crystal display pixel point display voltage providing device |
| CN112967692A (en) * | 2021-02-26 | 2021-06-15 | 惠科股份有限公司 | Ghost eliminating circuit and display device |
-
2016
- 2016-08-22 CN CN201620913513.6U patent/CN205986619U/en active Active
Cited By (4)
| 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 |
| CN112002290A (en) * | 2020-09-22 | 2020-11-27 | 浙江鸿泉电子科技有限公司 | Liquid crystal display pixel point display voltage providing device |
| CN112967692A (en) * | 2021-02-26 | 2021-06-15 | 惠科股份有限公司 | Ghost eliminating circuit and display device |
| CN112967692B (en) * | 2021-02-26 | 2022-01-04 | 惠科股份有限公司 | Ghost eliminating circuit and display device |
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