CN109634338A - Power circuit, control method and display system - Google Patents
Power circuit, control method and display system Download PDFInfo
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- CN109634338A CN109634338A CN201811548896.1A CN201811548896A CN109634338A CN 109634338 A CN109634338 A CN 109634338A CN 201811548896 A CN201811548896 A CN 201811548896A CN 109634338 A CN109634338 A CN 109634338A
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 230000001629 suppression Effects 0.000 claims abstract description 30
- 230000009466 transformation Effects 0.000 claims abstract description 18
- 238000006243 chemical reaction Methods 0.000 claims description 16
- 229920001621 AMOLED Polymers 0.000 claims description 15
- 230000006641 stabilisation Effects 0.000 claims description 8
- 238000011105 stabilization Methods 0.000 claims description 8
- 239000004973 liquid crystal related substance Substances 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 3
- 239000002096 quantum dot Substances 0.000 claims description 3
- 238000012512 characterization method Methods 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 8
- 230000005611 electricity Effects 0.000 description 20
- 238000010586 diagram Methods 0.000 description 8
- 239000004065 semiconductor Substances 0.000 description 6
- 230000008859 change Effects 0.000 description 5
- 230000009467 reduction Effects 0.000 description 5
- 230000002411 adverse Effects 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 230000005669 field effect Effects 0.000 description 3
- 229910044991 metal oxide Inorganic materials 0.000 description 3
- 150000004706 metal oxides Chemical class 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000010009 beating Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
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Abstract
The invention discloses the control method of a kind of power circuit, display system and power circuit, power circuit includes: voltage transformation module, for converting input voltage into output voltage under the adjusting of reference voltage；Base modules, for providing reference voltage to voltage transformation module according to operating voltage；And noise suppression module, for converting input voltage into the builtin voltage for being less than input voltage, builtin voltage can be used as the operating voltage of base modules, noise suppression module is as internal electric source, to the attenuation process of an intergrade more than the wobble variation of input voltage, influence of the disturbance to power circuit that can reduce input voltage increases power circuit to the power supply rejection ratio of input voltage, improves the stability of circuit.
Description
Technical field
The present invention relates to technical field of integrated circuits, relate more specifically to the controlling party of a kind of power circuit, power circuit
Method and display system.
Background technique
Power supply rejection ratio (Power Supply Rejection Ratio, PSRR) is input terminal voltage variation and output end
The ratio of voltage change, power supply rejection ratio is bigger, and output end voltage is influenced smaller by input terminal voltage variation.
Fig. 1 shows a kind of structural schematic diagram of AMOLED power circuit according to prior art, as shown in Figure 1, power supply is electric
Road 100 includes base modules 110, the first converting unit 120 and the second converting unit 130.
Base modules 110 are, for example, band-gap reference circuit (Bandgap), for providing reference voltage Vbg.
First converting unit 120 is, for example, DC-DC converter (DC-DC converter), for turning input voltage vin
Change conversion voltage Vreg into.Such as when input voltage vin is 2V~4.5V, and the output voltage Vout of system is 5V~8V,
With regard to needing the first converting unit 120 to carry out boost conversion to input voltage vin.But simple booster circuit or reduction voltage circuit
Output ripple generally at tens millivolts or so, therefore in order to inhibit output ripple, it will usually in booster circuit or decompression electricity
A low pressure difference linear voltage regulator (Low dropout regulator, LDO) is connected after road.
Second converting unit 130 is used to obtain output voltage Vout according to conversion voltage Vreg.Second converting unit 130 packet
Include operational amplifier OP1, transistor N1, transistor P1 and P2, resistance R1 and R2 and output capacitance Co.Wherein, transistor N1
It is N-type MOSFET (N-Metal-Oxide-Semiconductor, N-type Metal Oxide Semiconductor Field Effect Transistor) crystal
Pipe P1 and P2 are that (metal oxide semiconductor field-effect of P-Metal-Oxide-Semiconductor, p-type are brilliant by p-type MOSFET
Body pipe).
The grid and source electrode of transistor P1 and transistor P2 composition current mirror, transistor P1 and transistor P2 are connected with each other,
The source electrode of transistor P1 and transistor P2 receive conversion voltage Vreg.Transistor N1 is connected to drain electrode and the ground of transistor P1
Between, resistance R1 and resistance R2 are connected in series between the drain electrode and ground of transistor P2, and the intermediate node of resistance R1 and resistance R2 are used
In offer feedback voltage VFB.Output capacitance Co is connected between output voltage Vout and ground.
Operational amplifier OP1 is used for according to feedback voltage VFBThe voltage drop of transistor N1 is adjusted with reference voltage Vbg, then
Realize the stabilization of output voltage Vout.Such as when output voltage Vout is increased, feedback voltage VFBAlso it can increase, operational amplifier
The error signal V of OP1 outputN1It reduces, the drain voltage V of transistor N1P1It reduces, then leads to output voltage Vout reduction.
The power circuit of the prior art has deficiency below: the inhibition that power circuit generates the shake of input voltage is imitated
Fruit is undesirable, for such as AMOLED driving application scenarios when, output voltage can be generated with the shake of input voltage compared with
Big shake causes screen display " water ripples " (i.e. screen shows the trend for light and shade variation occur) occur.
Therefore, it is necessary to which the power circuit to the prior art improves, to improve power circuit to the electricity of input voltage
Source inhibits ratio.
Summary of the invention
In view of this, the purpose of the present invention is to provide the control methods and display of a kind of power circuit, power circuit
The power supply rejection ratio of power circuit can be improved in system.
A kind of power circuit provided according to a first aspect of the embodiments of the present invention, comprising: voltage transformation module is used for
Output voltage is converted input voltage under the adjusting of reference voltage；Base modules, for providing the base according to operating voltage
Quasi- voltage；And noise suppression module, for the input voltage to be converted to the builtin voltage less than the input voltage, and
The base modules are provided to using the builtin voltage as the operating voltage.
Preferably, the power circuit further includes switching module, for initial phase after the power-up by the input
Voltage is exported as the operating voltage, and using the builtin voltage as the work electricity after initial phase
Pressure.
Preferably, the switching module is according to characterizing the sampled signal of the builtin voltage for the input voltage and described
The output of one of builtin voltage is the operating voltage, wherein is less than predetermined electricity when the sampled signal characterizes the builtin voltage
When pressure, the switching module exports the input voltage for the operating voltage, when the sampled signal characterizes the inside
Voltage be greater than/be equal to predetermined voltage when, the switching module exports the builtin voltage for the operating voltage.
Preferably, the switching module includes: first switch, is connected to the Input voltage terminal and the switching module is defeated
Between outlet, control terminal is for receiving the sampled signal；Second switch is connected to the noise suppression module output end and institute
It states between switching module output end, control terminal is used to receive the inversion signal of the sampled signal, wherein when the sampled signal
When characterizing the builtin voltage less than the predetermined voltage, the first switch, the second switch is connected in the sampled signal
Shutdown；Be greater than when the sampled signal characterizes the builtin voltage/when being equal to the predetermined voltage, the reverse phase of the sampled signal
Second switch described in signal conduction, the first switch shutdown.
Preferably, the first switch and the second switch respectively by P-channel type MOSFET, N-channel type MOSFET or
Transmission gate is realized.
Preferably, the power circuit further include: buffer module, for providing first to third according to the reference voltage
Reference voltage, wherein the noise suppression module is according to the feedback voltage tune of second reference voltage and the builtin voltage
Save the builtin voltage, the voltage transformation module is according to first reference voltage, the third reference voltage and described defeated
The feedback voltage of voltage adjusts the output voltage out.
Preferably, the voltage transformation module includes: the first converting unit, for according to first reference voltage and institute
It states input voltage and generates conversion voltage；And second converting unit, for electric according to the third reference voltage and the conversion
Pressure generates the output voltage.
Preferably, first converting unit includes Boost circuit, and second converting unit includes LDO pressure stabilizing
Circuit.
Preferably, second converting unit includes current mirror, the first operational amplifier, the first transistor, the first feedback
Circuit and the first output capacitance, the feeder ear of the current mirror receive the conversion voltage, and the third transistor series connection connects
It connects between the input side and ground of the current mirror, first feed circuit and first output capacitance are connected in institute in parallel
It states between the outlet side of current mirror and ground, the tie point of the current mirror and first feed circuit provides the output electricity
Pressure, the normal phase input end of first operational amplifier is for receiving the third reference voltage, and inverting input terminal is for receiving
First feedback voltage, output end are connected to the control electrode of the third transistor, and first feed circuit is to the output electricity
Pressure samples to obtain the first feedback voltage, and the normal phase input end of first operational amplifier receives the third reference voltage, reverse phase
Input terminal receives first feedback voltage, and output end is connected to the control terminal of the first transistor to adjust and flow through described the
The electric current of one transistor.
Preferably, the noise suppression module includes: the second feed circuit and the second output capacitance, is connected in parallel described
Between the output end and ground of noise suppression module, second feed circuit samples the builtin voltage to obtain the second feedback electricity
Pressure；Second transistor, the first path terminal receive the input voltage, the output at alternate path end and the noise suppression module
End connection；And second operational amplifier, normal phase input end receive second reference voltage, inverting input terminal receives described the
Two feedback voltages, output end are connected to the control terminal of the second transistor to adjust the electric current for flowing through the second transistor.
Preferably, the buffer module includes third to four-operational amplifier, the positive of the third operational amplifier
Input terminal is connected with each other for receiving the reference voltage, inverting input terminal and output end, and output end is used to provide the described first
Reference voltage, the normal phase input end of the four-operational amplifier is for receiving the reference voltage, inverting input terminal and output
End is connected with each other, and output end is used to provide the described the second reference voltage, and the normal phase input end of the 5th operational amplifier is used for
The reference voltage is received, inverting input terminal and output end are connected with each other, and output end is used to provide the described third reference voltage.
A kind of display system provided according to a second aspect of the embodiments of the present invention, comprising: display screen；And above-mentioned electricity
Source circuit, the power circuit are used to export supply voltage to the display screen.
Preferably, the display screen include liquid crystal display, LED display, AMOLED display screen, quantum dot display screen,
Electronic Paper, MicroLED or MiniLED display screen.
A kind of control method of the power circuit provided according to a third aspect of the embodiments of the present invention, power circuit include upper
The power circuit stated, wherein the control method includes: when starting power up, using the switching module by the input voltage
It is exported as the operating voltage；And stablize in the builtin voltage in preset value, it will be described using the switching module
Builtin voltage is exported as the operating voltage.
Preferably, stablize in the builtin voltage in preset value, made the builtin voltage using the switching module
It include: the detection builtin voltage for the step of operating voltage output, when the builtin voltage is greater than/is equal to described preset
It when value, is exported using the switching module using the builtin voltage as the operating voltage, or tests in advance and store institute
The settling time for stating builtin voltage will be described interior using the switching module after power-on time reaches the settling time
Portion's voltage is exported as the operating voltage.
The control method of power circuit provided in an embodiment of the present invention, display system and power circuit has and below has
Beneficial effect:
Power circuit includes voltage transformation module, base modules and noise suppression module, and voltage transformation module is used in base
Output voltage is converted input voltage under the adjusting of quasi- voltage；Base modules are used to provide benchmark electricity to voltage transformation module
Pressure；Noise suppression module is used to convert input voltage into the builtin voltage less than input voltage, and builtin voltage can be used as benchmark
The operating voltage of module.Noise suppression module is as internal electric source, to intergrade more than the wobble variation of input voltage
Attenuation process can reduce influence of the disturbance to power circuit of input voltage, increase power circuit to the electricity of input voltage
Source inhibits ratio, solves the problems, such as that output voltage caused by beating because of input voltage is beated.
In a preferred embodiment, power circuit further includes switching module, the initial phase of switching module after the power-up
It exports input voltage as operating voltage to late-class circuit, and using builtin voltage as work electricity after initial phase
Pressure output will not reduce the driving capability of circuit while improving power circuit, it is steady to be conducive to raising circuit to late-class circuit
It is qualitative.
In a preferred embodiment, power circuit further includes buffer module, and buffer module has very strong driving capability, can
It avoids the power supply of late-class circuit from adversely affecting the voltage value of band-gap reference by capacitive coupling, improves the stabilization of reference voltage
Property, further increase the stability of circuit.
Detailed description of the invention
By referring to the drawings to the description of the embodiment of the present invention, above-mentioned and other purposes of the invention, feature and
Advantage will be apparent from.
Fig. 1 shows the structural schematic diagram of the power circuit of the AMOLED using the prior art；
Fig. 2 shows the structural schematic diagrams of the power circuit of AMOLED according to a first embodiment of the present invention；
Fig. 3 shows the circuit diagram of the power circuit of AMOLED according to a first embodiment of the present invention；
Fig. 4 shows the output effect figure of power circuit according to a first embodiment of the present invention；
Fig. 5 shows the flow diagram of the control method of power circuit according to a second embodiment of the present invention.
It include: base modules 110, the first converting unit 120, the second converting unit 130, base modules 210, voltage in figure
Conversion module 260, the first converting unit 220, the second converting unit 230, noise suppression module 240, switching module 250.
Specific embodiment
Hereinafter reference will be made to the drawings, and the present invention will be described in more detail.In various figures, identical element is using similar attached
Icon is remembered to indicate.For the sake of clarity, the various pieces in attached drawing are not necessarily to scale.In addition, may not show in figure
Certain well known parts out.
Many specific details of the invention, such as structure, material, size, the processing work of component is described hereinafter
Skill and technology, to be more clearly understood that the present invention.But it just as the skilled person will understand, can not press
The present invention is realized according to these specific details.
It should be appreciated that in the following description, " circuit ", which refers to, passes through electrical connection by least one element or sub-circuit
Or the galvanic circle that electromagnetism connects and composes.When title element or another element of circuit " being connected to " or element/circuit " being connected to "
When between two nodes, it can be directly coupled or connected to another element or may exist intermediary element, between element
Connection can be physically, in logic or its combination.On the contrary, when claiming element " being directly coupled to " or " being directly connected to
To " another element when, it is meant that the two be not present intermediary element.
Fig. 2 shows the structural schematic diagrams of the power circuit of AMOLED according to a first embodiment of the present invention.As shown in Fig. 2,
Power circuit 200 includes base modules 210, voltage transformation module 260, noise suppression module 240 and switching module 250.
Voltage transformation module 260 is connected between Input voltage terminal and output voltage terminal, for according to operating voltage
Vinner and input voltage vin generate output voltage Vout.Specifically, voltage transformation module 260 includes the first converting unit 220
With the second converting unit 230, the first converting unit 220 is used to carry out voltage transformation to input voltage vin to obtain conversion voltage
Vreg, the second converting unit 230 are used to obtain output voltage Vout according to conversion voltage Vreg.
In the present embodiment, the first converting unit 220 is, for example, DC-DC converter (DC-DC converter), Ke Yiwei
Booster circuit may be reduction voltage circuit.It is described by taking booster circuit as an example in the specific embodiment.
Base modules 210 are band-gap reference circuit (Bandgap), for providing reference voltage according to operating voltage Vinner
Vbg。
Noise suppression module 240 is connected to Input voltage terminal, obtains being less than for decaying to input voltage vin defeated
Enter the builtin voltage Vbuf of voltage Vin, and is provided to using the builtin voltage Vbuf as the operating voltage Vinner described
Base modules 210.
Switching module 250 is used for the sampled signal Vcs according to characterization builtin voltage Vbuf for input voltage vin or inside
Voltage Vbuf output is operating voltage Vinner.
In the initial phase that the power circuit 200 has just powered on, sampled signal Vcs is low level, and switching module 250 will
Input voltage vin output is operating voltage Vinner；At the end of the initial phase powered on, builtin voltage Vbuf increases to pre-
If value, sampled signal become high level, switching module 250 exports builtin voltage Vbuf for operating voltage Vinner.
In some embodiments, the settling time that can also test in advance and store builtin voltage Vbuf, in power-on time
After reaching the settling time, switching module 250 is exported builtin voltage Vbuf as operating voltage Vinner.
Internal electric source of the noise suppression module 240 as power circuit 200, more than the wobble variation of input voltage vin
The attenuation process of one intergrade increases power circuit to the power supply rejection ratio of input voltage vin.
In order to avoid the power supply of late-class circuit adversely affects by capacitive coupling the voltage of the band-gap reference of power circuit 200
Value, power circuit 200 further include buffer module 260, and buffer module 260 is used for according to reference voltage Vbg to the first converting unit
220, noise suppression module 240 and the second converting unit 230 provide first to third reference voltage Vref 1-Vref3.Buffering
Module 260 has very strong driving capability, therefore first to third reference voltage Vref 1-Vref3 voltage dithering will not influence
To the stabilization of reference voltage Vbg.
Fig. 3 shows the circuit diagram of power circuit according to a first embodiment of the present invention.
Second converting unit 230 includes operational amplifier OP1, transistor N1, current mirror 231, resistance R1 and R2 and defeated
Capacitor Co1 out.
Current mirror 231 includes the feeder ear of the first converting unit 220 of connection, input side, the Yi Jilian for connecting transistor N1
Connect the outlet side of output voltage terminal.Current mirror 231 includes transistor P1 and transistor P2, the grid of transistor P1 and transistor P2
It is connected with each other, the source electrode or drain electrode of transistor P1 and transistor P2 receive conversion voltage Vreg.Transistor N1 is connected to crystal
Between another pole of pipe P1 and ground.Wherein, transistor N1 is N-type MOSFET (Metal-Oxide-Semiconductor, metal
Oxide semiconductor field effect transistor), transistor P1 and P2 are p-type MOSFET.
Resistance R1 and resistance R2 are connected in series between output voltage terminal and ground, and resistance R1 and resistance R2 constitute the first feedback
The intermediate node of circuit, resistance R1 and resistance R2 are for providing the first feedback voltage VFB1.Output capacitance Co1 is connected to output electricity
It presses between Vout and ground.
The normal phase input end of operational amplifier OP1 receives third reference voltage Vref 3, and inverting input terminal receives the first feedback
Voltage VFB1, output end is connected to the grid of transistor N1.Operational amplifier OP1 is used for according to the first feedback voltage VFB1And third
Reference voltage Vref 3 adjusts the electric current for flowing through transistor N1, then realizes the stabilization of output voltage Vout.Such as work as output voltage
When Vout is increased, the first feedback voltage VFB1Also it can increase, the error signal V of operational amplifier OP1 outputN1It reduces, transistor N1
Drain voltage VP1It reduces, then leads to output voltage Vout reduction.
Noise suppression module 240 includes operational amplifier OP2, transistor N2, resistance R3 and R4 and output capacitance Co2.
Transistor N2, resistance R3 and resistance R4 are connected in series between Input voltage terminal and ground, resistance R3 and resistance R4 structure
At the second feed circuit, the intermediate node of resistance R3 and resistance R4 are for providing the second feedback voltage VFB2.Output capacitance Co2's
First end is connected to the source electrode of transistor N2, second end ground connection.
The normal phase input end of operational amplifier OP2 receives the second reference voltage Vref 2, and inverting input terminal receives the second feedback
Voltage VFB2, output end is connected to the grid of transistor N2.Wherein, transistor N2 is N-type MOSFET, and operational amplifier OP2 is used for
According to the second feedback voltage VFB2The electric current for flowing through transistor N2 is adjusted with the second reference voltage Vref 2, then realizes builtin voltage
The stabilization of Vbuf.Such as when builtin voltage Vbuf is increased, the second feedback voltage VFB2Also it can increase, operational amplifier OP2 output
Error signal VN2It reduces, then leads to builtin voltage Vbuf reduction.
Noise suppression module 240 is for decaying to input voltage vin to obtain builtin voltage Vbuf, wherein Vbuf=
Vref3*(R3+R4)/R4< Vin, the resistance value by the way that resistance R3 and resistance R4 is rationally arranged can guarantee that late-class circuit can be in internal electricity
It is worked normally under pressure Vbuf.
Switching module 250 includes switch P3 and switch P4.Switch P3 is connected to the defeated of Input voltage terminal and switching module 250
Between outlet, control terminal is for receiving sampled signal Vcs.Switch P4 is connected to output end and the switching of noise suppression module 240
Between the output end of module 250, control terminal is used to receive the inversion signal of sampled signal Vcs.Switch P3 is according to sampled signal Vcs
Turn-on and turn-off, switch P4 is according to the inversion signal turn-on and turn-off of sampled signal Vcs.
In some embodiments, switching module 250 further includes phase inverter U1, and the first end of phase inverter U1 is connected to sampling letter
Number Vcs input terminal, second end are connected to the control terminal of switch P4.
Switch P3 and switch P4 is for example realized by P-channel type MOSFET, N-channel type MOSFET or transmission gate respectively.Institute
When stating power circuit 200 and just powering on, sampled signal Vcs is low level, switch P3 conducting, and switch P4 is turned off, the general of switching module 250
Input voltage vin output is operating voltage Vinner；When builtin voltage Vbuf increases to scheduled voltage, sampled signal becomes
High level, switch P4 conducting, switch P3 shutdown, switching module 250 export builtin voltage Vbuf for operating voltage Vinner.
Buffer module 260 includes operational amplifier OP3-OP4.The normal phase input end of operational amplifier OP3 receives benchmark electricity
Vbg is pressed, inverting input terminal and output end are connected with each other, and output end provides the first reference voltage signal Vref1.Operational amplifier
The normal phase input end of OP4 receives reference voltage Vbg, and inverting input terminal and output end are connected with each other, and output end provides the second reference
Voltage signal Vref2.The normal phase input end of operational amplifier OP5 receives reference voltage Vbg, and inverting input terminal and output end are mutual
Connection, output end provide third reference voltage signal Vref3.
Assuming that base modules 210, the first converting unit 220, the second converting unit 230 and noise suppression module 240
Power supply rejection ratio is 40dB, i.e. 40dB=20log100.Then when the available voltage dithering for having AmV when input voltage vin,
Then there is Vinner=A/100, Δ Vbg=VinnerThe electricity of/100=A/10000, available conversion voltage Vreg in the ideal case
Pressure is dithered as Δ Vreg=Δ Vbg*Vreg/Vbg=A/10000*Vreg/Vbg, the voltage dithering for finally obtaining output voltage Vout is
ΔVout=Δ Vbg*(R1+R2)/R2+ΔVreg/100.Assuming that Vbg=1V, Vreg=6.3V, Vout=6V, A=500, then (R1+
R2)/R2=6, finally obtain Δ Vout=0.303mV.
And the driving of AMOLED is when requiring input voltage vin to have the voltage dithering of 500mV, by screen gray scale regulation stall
It is required that the voltage dithering of the output voltage Vout of power circuit is no more than 4mV, therefore the power circuit of the embodiment of the present invention is full
The driving requirement of sufficient AMOLED, caused by what is occurred when can be used for AMOLED with effective solution power circuit shakes because of input voltage
The problem of water ripples.
Also, the power supply rejection ratio PSRR=20log (500/0.303) of the power circuit of the embodiment of the present invention=
64.4dB effectively increases the power supply rejection ratio of power circuit.
Fig. 4 shows the output effect figure of power circuit according to a first embodiment of the present invention, and Vin indicates input in Fig. 4
The conversion curve of voltage, Vout1 indicate that the output voltage change curve of power circuit according to prior art, Vout2 indicate root
According to the output voltage change curve of the power circuit of the embodiment of the present invention.As seen from Figure 4, when input voltage vin changes,
Occur a variation peak 11 and variation peak 12 in the change curve of output voltage Vout1 and output voltage Vout2 respectively, and becomes
The height for changing peak 12 is less than the height at variation peak 11.Therefore the power circuit of the embodiment of the present invention can effectively improve the electricity of circuit
Source inhibits ratio, solves the problems, such as that output voltage caused by beating because of input voltage is beated.
In the above-described embodiments, it is illustrated with the power circuit for AMOLED display screen, still, power supply of the invention
Circuit is not limited system, and power circuit of the invention is equally applicable to the display screens such as liquid crystal, LED.
Illustratively, the embodiment of the present invention proposes a kind of display system simultaneously, including described in display screen and above-described embodiment
Power circuit, the power circuit be used for the display screen export supply voltage.Wherein, the display screen includes liquid crystal
Display screen, LED display, AMOLED display screen, quantum dot display screen, Electronic Paper, MicroLED or MiniLED display screen.
As Fig. 5 shows the flow diagram of the control method of power circuit according to a second embodiment of the present invention, the electricity
Source circuit includes above-mentioned power circuit, and the control method includes the following steps.
In step s101, it when starting power up, is exported using switching module using input voltage as operating voltage.
In step s 102, in internal voltage stabilization in preset value, using switching module using builtin voltage as work
Voltage output.Specifically, detect the builtin voltage, when the builtin voltage is greater than/be equal to the preset value when, using described
Switching module is exported the builtin voltage as the operating voltage；Or it tests in advance and stores building for the builtin voltage
Between immediately, after power-on time reaches the settling time, using the switching module using the builtin voltage as described in
Operating voltage output.
Internal electric source of the noise suppression module as power circuit, to an intergrade more than the wobble variation of input voltage
Attenuation process, increase power circuit to the power supply rejection ratio of input voltage, solve to export caused by because of input voltage bounce
The problem of voltage is beated.
In conclusion the control method of the power circuit of the embodiment of the present invention, display system and power circuit.Power supply electricity
Road includes voltage transformation module, base modules and noise suppression module, and voltage transformation module is connected to Input voltage terminal and output
Between voltage end, for generating output voltage according to input voltage.Base modules are used to provide benchmark electricity to voltage transformation module
Pressure.Noise suppression module obtains builtin voltage, operating voltage of the builtin voltage as base modules for input voltage of decaying.It makes an uproar
Sound suppression module to the attenuation process of an intergrade more than the wobble variation of input voltage, can reduce as internal electric source
Influence of the disturbance of input voltage to power circuit increases power circuit to the power supply rejection ratio of input voltage, solve because
The problem of bounce of output voltage caused by input voltage is beated.
In a preferred embodiment, power circuit further includes switching module, the initial phase of switching module after the power-up
It exports input voltage as operating voltage to late-class circuit, and using builtin voltage as work electricity after initial phase
Pressure output will not reduce the driving capability of circuit while improving power circuit, it is steady to be conducive to raising circuit to late-class circuit
It is qualitative.
In a preferred embodiment, power circuit further includes buffer module, and buffer module has very strong driving capability, can
It avoids the power supply of late-class circuit from adversely affecting the voltage value of band-gap reference by capacitive coupling, improves the stabilization of reference voltage
Property, further increase the stability of circuit.
The power circuit of the embodiment of the present invention meets the driving requirement of AMOLED, can be used for effective solution power circuit
Occur when AMOLED because input voltage shake caused by water ripples the problem of.
It should be noted that herein, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, method, article or equipment including the element.
It is as described above according to the embodiment of the present invention, these embodiments details all there is no detailed descriptionthe, also not
Limiting the invention is only the specific embodiment.Obviously, as described above, can make many modifications and variations.This explanation
These embodiments are chosen and specifically described to book, is principle and practical application in order to better explain the present invention, thus belonging to making
Technical field technical staff can be used using modification of the invention and on the basis of the present invention well.The present invention is only by right
The limitation of claim and its full scope and equivalent.
Claims (15)
1. a kind of power circuit, comprising:
Voltage transformation module, for converting input voltage into output voltage under the adjusting of reference voltage；
Base modules, for providing the reference voltage according to operating voltage；And
Noise suppression module, for the input voltage to be converted to the builtin voltage less than the input voltage, and will be described
Builtin voltage is provided to the base modules as the operating voltage.
2. power circuit according to claim 1, which is characterized in that further include switching module, at the beginning of after the power-up
Stage beginning exports the input voltage as the operating voltage, and by the inside after initial phase
Voltage is as the operating voltage.
3. power circuit according to claim 2, which is characterized in that the switching module is according to the characterization builtin voltage
Sampled signal one of the input voltage and the builtin voltage are exported as the operating voltage,
Wherein, when the sampled signal, which characterizes the builtin voltage, is less than predetermined voltage, the switching module is by the input
Voltage output is the operating voltage,
Be greater than when the sampled signal characterizes the builtin voltage/when being equal to predetermined voltage, the switching module is by the inside
Voltage output is the operating voltage.
4. power circuit according to claim 1, which is characterized in that the switching module includes:
First switch is connected between the Input voltage terminal and the switching module output end, and control terminal is described for receiving
Sampled signal；
Second switch is connected between the noise suppression module output end and the switching module output end, and control terminal is used for
The inversion signal of the sampled signal is received,
Wherein, when the sampled signal, which characterizes the builtin voltage, is less than the predetermined voltage, institute is connected in the sampled signal
State first switch, the second switch shutdown；
Be greater than when the sampled signal characterizes the builtin voltage/when being equal to the predetermined voltage, the reverse phase of the sampled signal
Second switch described in signal conduction, the first switch shutdown.
5. power circuit according to claim 4, which is characterized in that the first switch and the second switch respectively by
P-channel type MOSFET, N-channel type MOSFET or transmission gate are realized.
6. power circuit according to claim 1, which is characterized in that further include:
Buffer module is used for according to reference voltage offer first to third reference voltage,
Wherein, the noise suppression module is according to the adjusting of the feedback voltage of second reference voltage and the builtin voltage
Builtin voltage,
The voltage transformation module is according to the feedback of first reference voltage, the third reference voltage and the output voltage
Voltage adjusts the output voltage.
7. power circuit according to claim 6, wherein the voltage transformation module includes:
First converting unit, for generating conversion voltage according to first reference voltage and the input voltage；And
Second converting unit, for generating the output voltage according to the third reference voltage and the conversion voltage.
8. power circuit according to claim 7, wherein first converting unit includes Boost circuit, described
Second converting unit includes LDO voltage regulator circuit.
9. power circuit according to claim 7, wherein second converting unit includes that current mirror, the first operation are put
Big device, the first transistor, the first feed circuit and the first output capacitance,
The feeder ear of the current mirror receives the conversion voltage, and the third transistor is connected in series in the defeated of the current mirror
Enter between side and ground, first feed circuit and first output capacitance be connected in parallel the outlet side of the current mirror with
Between ground, the tie point of the current mirror and first feed circuit provides the output voltage,
The normal phase input end of first operational amplifier is for receiving the third reference voltage, and inverting input terminal is for receiving
First feedback voltage, output end are connected to the control electrode of the third transistor,
First feed circuit samples to obtain the first feedback voltage, the positive of first operational amplifier to the output voltage
Input terminal receives the third reference voltage, and inverting input terminal receives first feedback voltage, and output end is connected to described the
The control terminal of one transistor flows through the electric current of the first transistor to adjust.
10. power circuit according to claim 6, wherein the noise suppression module includes:
Second feed circuit and the second output capacitance, are connected in parallel between the output end and ground of the noise suppression module, institute
The second feed circuit is stated the builtin voltage is sampled to obtain the second feedback voltage；
Second transistor, the first path terminal receive the input voltage, and alternate path end is defeated with the noise suppression module
Outlet connection；And
Second operational amplifier, normal phase input end receive second reference voltage, and inverting input terminal receives second feedback
Voltage, output end are connected to the control terminal of the second transistor to adjust the electric current for flowing through the second transistor.
11. power circuit according to claim 6, wherein the buffer module includes third to four-operational amplifier,
For the normal phase input end of the third operational amplifier for receiving the reference voltage, inverting input terminal is mutual with output end
Connection, output end are used to provide the described the first reference voltage,
For the normal phase input end of the four-operational amplifier for receiving the reference voltage, inverting input terminal is mutual with output end
Connection, output end are used to provide the described the second reference voltage,
For the normal phase input end of 5th operational amplifier for receiving the reference voltage, inverting input terminal is mutual with output end
Connection, output end are used to provide the described third reference voltage.
12. a kind of display system characterized by comprising
Display screen；And
Power circuit as described in any one of claim 1 to 11, the power circuit are used to export to the display screen and power
Voltage.
13. display system according to claim 12, wherein the display screen include liquid crystal display, LED display,
AMOLED display screen, quantum dot display screen, Electronic Paper, MicroLED or MiniLED display screen.
14. a kind of control method of power circuit, the power circuit includes power supply as described in any one of claim 1 to 11
Circuit, which is characterized in that the control method includes:
When starting power up, exported using the switching module using the input voltage as the operating voltage；And
It is in internal voltage stabilization in preset value, the builtin voltage is defeated as the operating voltage using the switching module
Out.
15. control method according to claim 14, which is characterized in that stablize in the builtin voltage in preset value,
The step of being exported the builtin voltage as the operating voltage using the switching module include:
Detect the builtin voltage, when the builtin voltage is greater than/be equal to the preset value when, using the switching module by institute
Builtin voltage is stated to export as the operating voltage, or
The settling time for testing and storing in advance the builtin voltage utilizes after power-on time reaches the settling time
The switching module is exported the builtin voltage as the operating voltage.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811548896.1A CN109634338A (en) | 2018-12-18 | 2018-12-18 | Power circuit, control method and display system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811548896.1A CN109634338A (en) | 2018-12-18 | 2018-12-18 | Power circuit, control method and display system |
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| CN201811548896.1A Pending CN109634338A (en) | 2018-12-18 | 2018-12-18 | Power circuit, control method and display system |
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| CN111740477A (en) * | 2020-07-28 | 2020-10-02 | 深圳市航顺芯片技术研发有限公司 | Display screen control system and electronic equipment |
| CN112650348A (en) * | 2020-12-31 | 2021-04-13 | 成都瓴科微电子有限责任公司 | Low dropout regulator |
| CN113721689A (en) * | 2021-09-08 | 2021-11-30 | 无锡力芯微电子股份有限公司 | Power supply voltage stabilization chip for improving power supply rejection ratio |
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