CN206850669U - Power circuit and its liquid crystal display device - Google Patents
Power circuit and its liquid crystal display device Download PDFInfo
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- CN206850669U CN206850669U CN201720616691.7U CN201720616691U CN206850669U CN 206850669 U CN206850669 U CN 206850669U CN 201720616691 U CN201720616691 U CN 201720616691U CN 206850669 U CN206850669 U CN 206850669U
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Abstract
The utility model embodiment discloses a kind of power circuit and its liquid crystal display device, and the power circuit includes：Control unit, negative charge pump unit, partial pressure unit, boosting unit；Control unit includes control chip and the input block being connected with control chip, input block receives external input voltage, control chip is electrical connected with negative charge pump unit, partial pressure unit, boosting unit, the analog voltage output end output analog power voltage of control chip；Negative charge pump unit is connected with the negative charge pump analog voltage adjustment end of control chip and the gate off voltage feedback end of control chip, its output end output gate off voltage；Partial pressure unit is connected with the public electrode voltages end of control chip and the negative temperature compensating end of control chip, its output end output public electrode voltages；Boosting unit is connected with control chip, its output end output gate turn-on voltage.The utility model power circuit and its liquid crystal display device can the high supply voltage of output accuracy, and simple in construction, cost is low.
Description
Technical field
Power supply technique field is the utility model is related to, more particularly to a kind of power circuit and its liquid crystal display device.
Background technology
The power circuit of liquid crystal display device provides analog power voltage (AVDD), and bias such as gate turn-on voltage
VGH, gate off voltage VGL, and the voltage such as public electrode voltages VCOM, shown with driving liquid crystal display device to carry out picture
Show.Therefore, the power circuit of liquid crystal display device is part indispensable in liquid crystal display device drive circuit, and it produces electricity
The quality of source and bias has direct influence to display quality and electromagnetic compatibility (EMC) characteristic of liquid crystal display device.
At present, the power circuit of liquid crystal display device is mainly by booster switcher voltage-stabilized power supply circuit (Boost Switch
Converter) formed with charge pump (Charge Pump) circuit.Wherein, booster switcher voltage-stabilized power supply circuit produces driving electricity
Source voltage, such as analog power voltage AVDD etc., charge pump circuit produce gate turn-on voltage VGH, the grid of liquid crystal display device
Pole shut-off voltage VGL etc..
However, the analog power voltage AVDD that power circuit provides in the prior art, gate turn-on voltage VGH, grid closes
When any one voltage in power-off pressure VGL, and public electrode voltages VCOM changes, then it is required to adjust power circuit
In corresponding electronic component parameter, and voltage accuracy is also limited by the precision of electronic component parameter.Also, complicated adjustment
Process also increases cost of labor, reduces convenience, flexibility and the applicability of power circuit.
Utility model content
The utility model provides a kind of power circuit and its liquid crystal display device, can digitize and adjust and provide liquid crystal
Voltage needed for showing device work, precision is high, and simple in construction, cost is low.
The technical scheme is as follows：
The utility model provides a kind of power circuit, and it includes：Control unit, negative charge pump unit, partial pressure unit, liter
Press unit；Described control unit, including control chip and the input block that is connected with the control chip, wherein, the input
Unit receives external input voltage, the control chip and the negative charge pump unit, the partial pressure unit, the boosting unit
It is electrical connected, the analog voltage output end output analog power voltage of the control chip；The negative charge pump unit, it is and described
The negative charge pump analog voltage adjustment end of control chip is connected with the gate off voltage feedback end of the control chip, and it is exported
End output gate off voltage；The partial pressure unit, public electrode voltages end and the control chip with the control chip
Negative temperature compensating end be connected, its output end output public electrode voltages；The boosting unit, it is connected with the control chip,
Its output end exports gate turn-on voltage.
Further, the control chip also include the first signal oscillating end, first voltage input, reset output terminal,
Compensating end, buck converter control unit output end；The input block includes the first inductance, first resistor, second resistance, the
Three resistance, the first electric capacity；One end of first inductance receives external input voltage, and the other end of first inductance is connected to
First signal oscillating end of the control chip；One end of the first resistor receives external input voltage, the first resistor
The other end be connected to the first voltage input of the control chip；One end of the second resistance connects the control chip
Buck converter control unit output end, the other end of the second resistance is connected to the reset output of the control chip
End；One end of first electric capacity is connected to the compensating end of the control chip, first electric capacity by the 3rd resistor
The other end ground connection.
Further, the input block also includes the second electric capacity, and one end of second electric capacity is connected to the control
The first voltage input of chip, the other end ground connection of second electric capacity.
Further, the input block also includes filter unit, and the filter unit includes the 3rd electric capacity and the 4th electricity
Hold, one end of the 3rd electric capacity receives external input voltage, the other end ground connection of the 3rd electric capacity；4th electric capacity
One end receives external input voltage, the other end ground connection of the 4th electric capacity.
Further, the control chip also includes：Multiple free ends, simulation ground terminal, address of devices selection end, clock
End, data terminal, write-protect end, second voltage input, multiple digital ground terminals；The free end of the control chip is hanging；It is described
Terminate to the simulation of control chip simulation ground；The address of devices selection end of the control chip receives selection signal；The control
The clock end of chip receives clock signal, and the data terminal of the control chip receives data-signal；The control chip writes guarantor
Protect end and receive write-protect signal, the second voltage input of the control chip receives external input voltage, the control chip
Second voltage input also pass through the 5th capacity earth；The digitally end ground connection of the control chip.
Further, the negative charge pump unit includes the first diode, the second diode, the 6th electric capacity, the 7th electric capacity,
The negative charge pump analog voltage adjustment end phase that the anode of first diode passes through the 6th electric capacity and the control chip
Even, the minus earth of first diode；The negative electrode of second diode passes through the 6th electric capacity and the control core
The negative charge pump analog voltage adjustment end of piece is connected, the anode output gate off voltage of second diode, and described second
The anode of diode is also connected with the gate off voltage feedback end of the control chip, and the anode of second diode also passes through
7th capacity earth, the anode of second diode are also connected electrically to the analog voltage output end of negative charge pump unit.
Further, the partial pressure unit includes the 4th resistance, the 5th resistance, the 6th resistance, negative temperature coefficient thermistor power
Resistance, the 8th electric capacity, one end of the 4th resistance are connected with the public electrode voltages end of the control chip, the other end of the 4th resistance
Public electrode voltages are exported, the other end of the 4th resistance also passes through the 8th capacity earth；One end of 5th resistance with
The negative temperature compensating end of the control chip is connected, and the other end of the 5th resistance passes through the 6th resistance eutral grounding；The subzero temperature
One end of degree coefficient resistance is connected with the negative temperature compensating end of the control chip, the negative tempperature coefficient thermistor
The other end is connected with the other end of the 5th resistance.
Further, the boosting unit includes the second inductance, the 3rd diode and the 9th electric capacity, second inductance
One end is electrically connected to the analog power voltage output end of the control chip to receive analog power voltage, second inductance
The other end is connected with the secondary signal vibration end of the control chip；The anode of 3rd diode and the control chip
Secondary signal vibration end is connected, the negative electrode output gate turn-on voltage of the 3rd diode, the negative electrode of the 3rd diode
Also pass through the 9th capacity earth, the negative electrode of the 3rd diode and the boosting unit positive feedback end of the control chip
Connection, the negative electrode of the 3rd diode are electrically connected to the output end of boosting unit.
Further, the power circuit also includes：Operation amplifier unit and buck converter control unit, the computing
Amplifying unit includes the 7th resistance and the tenth electric capacity, and described control unit buck converter control unit includes the 3rd inductance and the
11 electric capacity；The amplification input of the control chip, which receives, is exaggerated input signal；One end of 7th resistance with it is described
The amplification output end of control chip is connected, the other end of the 7th resistance output amplified signal, the 7th resistance it is another
End also passes through the tenth capacity earth；One end of 3rd inductance connects with the 3rd signal oscillating end of the control chip
Connect, the other end of the 3rd inductance is electrically connected to institute by the 11st capacity earth, the other end of the 3rd inductance
The buck converter control unit output end of control chip is stated, the other end of the 3rd inductance is electrically connected to buck converter control
The output end of unit processed, the analog power voltage output end of the control chip also by the 12nd electric capacity, the 13rd electric capacity and
14th capacity earth.
The utility model provides a kind of liquid crystal display device, and it includes：Above-mentioned power circuit.
The beneficial effect brought of technical scheme that the utility model embodiment provides is：
The external input voltage received by the input block of circuit, so as to control chip digitized processing and export simulation
Supply voltage, gate off voltage is obtained by negative charge pump unit, and glass in liquid crystal display device is obtained by partial pressure unit
Public electrode voltages on substrate, handle to obtain gate turn-on voltage by boosting unit, so as to according to different liquid crystals
The panel demand of showing device, realize digitlization adjustment output analog power voltage, gate turn-on voltage, gate off voltage and
Public electrode voltages, operation is convenient and the precision of voltage output is high and simple in construction, and cost is relatively low.
Described above is only the general introduction of technical solutions of the utility model, in order to better understand skill of the present utility model
Art means, and being practiced according to the content of specification, and in order to allow above and other purpose of the present utility model, feature
It can be become apparent with advantage, below especially exemplified by preferred embodiment, and coordinate accompanying drawing, described in detail as follows.
Brief description of the drawings
Fig. 1 is the circuit diagram for the power circuit that the utility model embodiment provides；
Embodiment
Further to illustrate that the utility model is to reach the technological means and effect that predetermined purpose of utility model taken,
Below in conjunction with accompanying drawing and preferred embodiment, to according to the utility model proposes power circuit and its liquid crystal display device its is specific
Embodiment, structure, feature and effect, describe in detail as after.
Relevant of the present utility model foregoing and other technology contents, feature and effect, it is following coordinate with reference to schema compared with
Good embodiment can be clearly presented in describing in detail.By the explanation of embodiment, when can be to the utility model up to
The technological means and effect taken into predetermined purpose are able to more go deep into and specific understanding, but institute's accompanying drawings are only to provide
With reference to purposes of discussion, not be used for the utility model is any limitation as.
Fig. 1 is the circuit diagram for the power circuit that the utility model embodiment provides.The power circuit can digitize tune
Whole and provide the voltage needed for liquid crystal display device work, precision is high, and simple in construction, cost is low.It refer to Fig. 1, the present embodiment
Power circuit include：Control unit, negative charge pump unit 11, partial pressure unit 12, boosting unit 13.
Specifically, control unit, including control chip U1 and the input block 101 that is connected with control chip U1.Wherein, it is defeated
Enter unit 101 and receive input voltage, control chip U1 and negative charge pump unit 11, partial pressure unit 12,13 electrical phase of boosting unit
Even, control chip U1 analog voltage output end VAA output analog power voltages AVDD.Negative charge pump unit 11 is used to export grid
Pole shut-off voltage VGL.Partial pressure unit 12 is used to export public electrode voltages VCOM and carries out temperature-compensating to voltage.Boosting is single
Member 13 is used to export gate turn-on voltage VGH.
Further, control chip U1 is also defeated including the first signal oscillating end LX, first voltage input VIN1, reset
Go out to hold XAO, compensating end CompA, buck converter control unit output end Vbuck1.Input block 101 includes inductance L1 (first
Inductance), resistance R1 (first resistor), resistance R2 (second resistance), resistance R3 (3rd resistor), electric capacity C1 (the first electric capacity).Electricity
The one end for feeling L1 receives external input voltage Vin, and the inductance L1 other end is connected to control chip U1 the first signal oscillating end
LX.The first voltage that resistance R1 one end reception external input voltage Vin, resistance the R1 other end are connected to control chip U1 is defeated
Enter to hold VIN1.Resistance R2 one end connection control chip U1 buck converter control unit output end Vbuck1, buck become
The output end Vbuck of the buck converter control unit of control unit output end Vbuck1 connections one is changed, the resistance R2 other end connects
It is connected to control chip U1 reset output terminal XAO.Electric capacity C1 one end is connected to control chip U1 compensating end by resistance R3
CompA, electric capacity C1 other end ground connection.Preferably, input block 101 can also include the electric capacity for playing voltage stabilizing and filter action
C2 (the second electric capacity).Wherein, electric capacity C2 one end is connected to control chip U1 first voltage input VIN1, and electric capacity C2's is another
One end is grounded.
Preferably, input block 101 can also include playing burning voltage and the filter unit of filter action, filter unit
Including electric capacity C3 (the 3rd electric capacity) and electric capacity C4 (the 4th electric capacity).Wherein, electric capacity C3 one end receives external input voltage Vin,
Electric capacity C3 other end ground connection.Electric capacity C4 one end receives external input voltage Vin, electric capacity C4 other end ground connection.
Preferably, control chip U1 is except including above-mentioned pin：Outside reset output terminal XAO etc., control chip U1 is also
It can include：Multiple free end NC, simulation ground terminal AGND, address of devices selection end A0, clock end SCL1, data terminal SDA1, write
Protection end WPN1, second voltage input VIN2, multiple digital ground terminal PGND1-PGND3.Wherein, control chip U1 free end
NC is hanging.Control chip U1 simulation ground terminal AGND connects simulation ground.Control chip U1 negative charge pump analog voltage adjustment end
DRVN and gate off voltage feedback end VGL1 are connected with negative charge pump unit 11.Control chip U1 address of devices selection end A0
Receive selection signal (such as selection signal can be high level or low level input voltage).Control chip U1 clock end
SCL1 receives clock signal SCL, and control chip U1 data terminal SDA1 receives data-signal SDA.Wherein, clock signal SCL and
Data-signal SDA can be provided by I2C buses.Control chip U1 write-protect end WPN1 receives write-protect signal WPN, controls core
Piece U1 second voltage input VIN2 receives external input voltage Vin, and control chip U1 second voltage input VIN2 is also
It is grounded by the electric capacity C5 (the 5th electric capacity) for playing burning voltage and filter action.Control chip U1 digital ground terminal PGND1,
PGND2, PGND3 are grounded.Control chip U1 analog voltage output end VAA output analog power voltages AVDD.Preferably, control
Electric capacity C12s, electric capacity C13 and electric capacity C14 of the coremaking piece U1 voltage output end VAA also by playing burning voltage and filter action
Parallel circuit ground connection.Wherein, in one embodiment, control chip U1 can be, but not limited to model AAT1137 power supply
Chip, such as the power supply chip of other models can also be used in other embodiments.
Negative charge pump unit 11, with control chip U1 negative charge pump analog voltage adjustment end DRVN and control chip U1
Gate off voltage feedback end VGL1 is connected, its output end output gate off voltage VGL.Negative charge pump unit 11 includes two poles
Pipe D0 (the first diode), diode D1 (the second diode), electric capacity C6 (the 6th electric capacity), electric capacity C7 (the 7th electric capacity).Wherein,
Diode D0 anode is connected by electric capacity C6 with control chip U1 negative charge pump analog voltage adjustment end DRVN, diode D0
Minus earth.The negative charge pump analog voltage adjustment end DRVN phases that diode D1 negative electrode passes through electric capacity C6 and control chip U1
Even, diode D1 anode output gate off voltage VGL, diode D1 anode are also connected with control chip U1 gate turn-off
Pressure feedback port VGL1, it is preferable that diode D1 anode can also be grounded by playing the electric capacity C7 of voltage stabilizing and filter action.Two
Pole pipe D1 anode is also connected electrically to the analog voltage output end of negative charge pump unit, to export gate off voltage VGL.Two poles
Pipe D0, D1 model BAT54, but it is not limited to this.
Partial pressure unit 12, compensated with control chip U1 public electrode voltages end DVCOM and control chip U1 negative temperature
End NTC is connected, its output end output public electrode voltages VCOM.Partial pressure unit 12 includes resistance R4 (the 4th resistance), resistance R5
(the 5th resistance), resistance R6 (the 6th resistance), negative tempperature coefficient thermistor Rnlc, electric capacity C8 (the 8th electric capacity).Wherein, resistance
R4 one end is connected with control chip U1 public electrode voltages end DVCOM, resistance R4 other end output public electrode voltages
VCOM, resistance the R4 other end are also grounded by electric capacity C8.Resistance R5 one end and control chip U1 negative temperature compensating end NTC
It is connected, the other end is grounded by resistance R6.Mended with control chip U1 negative temperature negative tempperature coefficient thermistor Rnlc one end
Repay end NTC to be connected, the negative tempperature coefficient thermistor Rnlc other end is grounded by resistance R6.
Boosting unit 13, it is connected with control chip U1 secondary signal vibration end LXH, its output end output grid opens electricity
Press VGH.Boosting unit 13 includes inductance L2 (the second inductance), diode D2 (the 3rd diode) and electric capacity C9 (the 9th electric capacity).
Wherein, inductance L2 one end is electrically connected to the analog power voltage output end of control chip to receive analog power voltage AVDD,
The inductance L2 other end is connected with control chip U1 signal oscillating end LXH (secondary signal vibration end).Diode D2 anode
It is connected with control chip U1 signal oscillating end LXH, diode D2 negative electrode output gate turn-on voltage VGH.Diode D2's
The boosting unit positive feedback end VGH1 connections of negative electrode and control chip, diode D2 negative electrode are also connected electrically to boosting unit
Output end is to export gate turn-on voltage VGH.Preferably, diode D2 negative electrode is also grounded by electric capacity C9.Diode D2's
Model BAT760-7, but it is not limited to this.
Preferably, power circuit can also include：Operation amplifier unit 15.Wherein, operation amplifier unit 15 can include
Resistance R8 (the 8th resistance) and electric capacity C10 (the tenth electric capacity).Wherein, control chip U1 amplification input OP-IN1 is received and put
Big input signal OP-IN.Resistance R8 one end is connected with control chip U1 amplification output end OP-OUT1, and resistance R8's is another
End output amplified signal OP-OUT, the resistance R8 other end are also grounded by electric capacity C10.Operation amplifier unit 15 can reach increasing
The effect of strong signal, strengthens the driving force for being exaggerated input signal.
Preferably, power circuit can also include：Buck converter control unit control unit 16.Wherein, buck becomes
Inductance L3 (the 3rd inductance) and electric capacity C11 (the 11st electric capacity) can be included by changing control unit 16.Wherein, inductance L3 one end with
Control chip U1 the 3rd signal oscillating end LXB connections, the inductance L3 other end are grounded by electric capacity C11.Inductance L3's is another
End is electrically connected to the buck converter control unit output end Vbuck1 of control chip, and the inductance L3 other end is also connected electrically to drop
Pressure type converts the output end Vbuck of control unit.
Further, the utility model embodiment also provides a kind of liquid crystal display device, and the liquid crystal display device is included such as
Upper described power circuit.
Specifically, the external input voltage Vin that power circuit is received using the input block 101 of control unit, so as to control
Coremaking piece U1 digitized processings simultaneously export analog power voltage AVDD to provide pixel on the data wire into liquid crystal display device
Voltage AVDD, and partial pressure unit 12 obtains the public electrode voltages VCOM in liquid crystal display device on glass substrate.Rise simultaneously
Pressure unit 13 obtains being used for the grid for opening TFT in liquid crystal display device in scan line to analog power voltage AVDD processing
Cut-in voltage VGH.Negative charge pump unit 11 obtains being used for the gate off voltage for turning off TFT in liquid crystal display device in scan line
VGL。
In summary, the power circuit and its liquid crystal display device that the utility model embodiment provides, pass through control unit
The external input voltage Vin that receives of input block 101, so as to control chip U1 digitized processings and export analog power voltage
AVDD, gate off voltage VGL is obtained by negative charge pump unit 11, and glass in liquid crystal display device is obtained by partial pressure unit 12
Public electrode voltages VCOM on glass substrate, handled by boosting unit 13 and obtain gate turn-on voltage VGH, so as to basis
The panel demand of different liquid crystal display devices, realize analog power voltage AVDD, the gate turn-on voltage of digitlization adjustment output
VGH, gate off voltage VGL and public electrode voltages VCOM, operation is convenient and the precision of voltage output is high, and structure letter
Single, cost is relatively low.
In addition, corresponding deposit inside control chip U1 can also also be changed by the communication of control chip U1 and I2C buses
The parameter of device, to export accurate analog power voltage AVDD, gate turn-on voltage VGH, gate off voltage VGL and common electrical
Pole tension VCOM and switch oscillating frequency.Because it can dynamically change the switch oscillating frequency inside control chip U1, therefore
Reduce the frequency resonance between power circuit and other parts, improve the Electro Magnetic Compatibility of power circuit.In addition, power circuit
Also there is the operation amplifier unit 15 being connected with control chip and control unit buck converter control unit 16, it is with better function,
Therefore there is wide applicability.
It is described above, only it is preferred embodiment of the present utility model, not the utility model is made any formal
Limitation, although the utility model is disclosed above with preferred embodiment, but be not limited to the utility model, it is any ripe
Professional and technical personnel is known, is not being departed from the range of technical solutions of the utility model, when in the technology using the disclosure above
Hold the equivalent embodiment made a little change or be modified to equivalent variations, as long as being without departing from technical solutions of the utility model
Hold, any simple modification, equivalent change and modification made according to the technical essence of the utility model to above example, still
Belong in the range of technical solutions of the utility model.
Claims (10)
1. a kind of power circuit, it is characterised in that it includes：Control unit, negative charge pump unit, partial pressure unit, boosting unit；
Described control unit, including control chip and the input block that is connected with the control chip, wherein, the input block
External input voltage is received, the control chip and the negative charge pump unit, the partial pressure unit, the boosting unit are electrical
It is connected, the analog power voltage output end output analog power voltage of the control chip；
The negative charge pump unit, with the negative charge pump analog voltage adjustment end of the control chip and the grid of the control chip
Pole shut-off pressure feedback port is connected, its output end output gate off voltage；
The partial pressure unit, with the public electrode voltages end of the control chip and the negative temperature compensating end phase of the control chip
Even, its output end output public electrode voltages；
The boosting unit, it is connected with the control chip, its output end output gate turn-on voltage.
2. power circuit according to claim 1, it is characterised in that the control chip also includes the first signal oscillating
End, first voltage input, reset output terminal, compensating end, buck converter control unit output end；The input block includes
First inductance, first resistor, second resistance, 3rd resistor, the first electric capacity；One end of first inductance receives outside input electricity
Pressure, the other end of first inductance are connected to the first signal oscillating end of the control chip；One end of the first resistor
External input voltage is received, the other end of the first resistor is connected to the first voltage input of the control chip；It is described
One end of second resistance connects the buck converter control unit output end of the control chip, the other end of the second resistance
It is connected to the reset output terminal of the control chip；One end of first electric capacity is connected to the control by the 3rd resistor
The compensating end of coremaking piece, the other end ground connection of first electric capacity.
3. power circuit according to claim 2, it is characterised in that the input block also includes the second electric capacity, described
One end of second electric capacity is connected to the first voltage input of the control chip, the other end ground connection of second electric capacity.
4. power circuit according to claim 2, it is characterised in that the input block also includes filter unit, described
Filter unit includes the 3rd electric capacity and the 4th electric capacity, and one end of the 3rd electric capacity receives external input voltage, the 3rd electricity
The other end ground connection of appearance；One end of 4th electric capacity receives external input voltage, the other end ground connection of the 4th electric capacity.
5. power circuit according to claim 1, it is characterised in that the control chip also includes：Multiple free ends, mould
Intend ground terminal, address of devices selection end, clock end, data terminal, write-protect end, second voltage input, multiple digital ground terminals；It is described
The free end of control chip is hanging；Terminate to the simulation of the control chip simulation ground；The address of devices choosing of the control chip
Select end and receive selection signal；The clock end of the control chip receives clock signal, and the data terminal of the control chip receives number
It is believed that number；The write-protect end of the control chip receives write-protect signal, and the second voltage input of the control chip receives
External input voltage, the second voltage input of the control chip also pass through the 5th capacity earth；The number of the control chip
Word ground terminal is grounded.
6. power circuit according to claim 1, it is characterised in that the negative charge pump unit include the first diode,
Second diode, the 6th electric capacity, the 7th electric capacity, the anode of first diode pass through the 6th electric capacity and the control core
The negative charge pump analog voltage adjustment end of piece is connected, the minus earth of first diode；The negative electrode of second diode
It is connected by the 6th electric capacity with the negative charge pump analog voltage adjustment end of the control chip, the sun of second diode
Pole exports gate off voltage, and the anode of second diode is also connected with the gate off voltage feedback of the control chip
End, the anode of second diode are also also connected electrically to by the 7th capacity earth, the anode of second diode
The analog voltage output end of negative charge pump unit.
7. power circuit according to claim 1, it is characterised in that the partial pressure unit includes the 4th resistance, the 5th electricity
Resistance, the 6th resistance, negative tempperature coefficient thermistor, the 8th electric capacity, one end of the 4th resistance and the common electrical of the control chip
Pole tension end is connected, and the other end output public electrode voltages of the 4th resistance, the other end of the 4th resistance also passes through the 8th
Capacity earth；One end of 5th resistance is connected with the negative temperature compensating end of the control chip, the 5th resistance it is another
One end passes through the 6th resistance eutral grounding；One end of the negative tempperature coefficient thermistor and the negative temperature compensating end of the control chip
It is connected, the other end of the negative tempperature coefficient thermistor is connected with the other end of the 5th resistance.
8. power circuit according to claim 1, it is characterised in that the boosting unit includes the second inductance, the three or two
Pole pipe and the 9th electric capacity, one end of second inductance are electrically connected to the analog power voltage output end of the control chip to connect
Analog power voltage is received, the other end of second inductance is connected with the secondary signal vibration end of the control chip；Described
The anode of three diodes is connected with the secondary signal vibration end of the control chip, the negative electrode output grid of the 3rd diode
Cut-in voltage, the negative electrode of the 3rd diode also pass through the 9th capacity earth, the negative electrode of the 3rd diode and institute
The boosting unit positive feedback end connection of control chip is stated, the negative electrode of the 3rd diode is electrically connected to the output of boosting unit
End.
9. power circuit according to claim 1, it is characterised in that the power circuit also includes：Operation amplifier unit
With buck converter control unit, the operation amplifier unit includes the 7th resistance and the tenth electric capacity, described control unit decompression
Formula conversion control unit includes the 3rd inductance and the 11st electric capacity；The amplification input of the control chip, which receives, is exaggerated input
Signal；One end of 7th resistance is connected with the amplification output end of the control chip, and the other end of the 7th resistance is defeated
Go out amplified signal, the other end of the 7th resistance also passes through the tenth capacity earth；One end of 3rd inductance and institute
The 3rd signal oscillating end connection of control chip is stated, the other end of the 3rd inductance passes through the 11st capacity earth, institute
The other end for stating the 3rd inductance is electrically connected to the buck converter control unit output end of the control chip, the 3rd inductance
The other end be electrically connected to the output end of buck converter control unit, the analog power voltage output end of the control chip is also
Pass through the 12nd electric capacity, the 13rd electric capacity and the 14th capacity earth.
10. a kind of liquid crystal display device, it is characterised in that it includes：Power supply electricity as claimed in any one of claims 1-9 wherein
Road.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2017203846980 | 2017-04-12 | ||
| CN201720384698 | 2017-04-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206850669U true CN206850669U (en) | 2018-01-05 |
Family
ID=60798496
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720616691.7U Active CN206850669U (en) | 2017-04-12 | 2017-05-27 | Power circuit and its liquid crystal display device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206850669U (en) |
-
2017
- 2017-05-27 CN CN201720616691.7U patent/CN206850669U/en active Active
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