CN109545123A - Voltage compensating circuit, its voltage compensating method, drive system and display device - Google Patents
Voltage compensating circuit, its voltage compensating method, drive system and display device Download PDFInfo
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- CN109545123A CN109545123A CN201910012467.0A CN201910012467A CN109545123A CN 109545123 A CN109545123 A CN 109545123A CN 201910012467 A CN201910012467 A CN 201910012467A CN 109545123 A CN109545123 A CN 109545123A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
Abstract
The invention discloses a kind of voltage compensating circuit, its voltage compensating method, drive system and display devices, by bleeder circuit comparison voltage will be generated after the voltage of power supply voltage output end, and by detection output circuit according to comparison voltage and reference voltage, output detection voltage allows detection voltage to reflect the ripple variation of the voltage of power supply voltage output end in real time.And it is compensated by boost control circuit according to the voltage that detection voltage exports power supply voltage output end, so as to be changed in real time according to the ripple of the voltage of power supply voltage output end, the voltage of power supply voltage output end is compensated, to reduce the ripple of the voltage of power supply voltage output end, and then improve the stability of Gamma voltage.
Description
Technical field
The present invention relates to field of display technology, in particular to a kind of voltage compensating circuit, its voltage compensating method, driving system
System and display device.
Background technique
The drive system of existing display device generally includes programmable gamma (P-Gamma) voltage generation circuit.P-
Gamma voltage generation circuit is used to receive the voltage AVDD of power supply voltage output end, and generates pixel according to voltage AVDD
Gray scale reference voltages (Gamma voltage), to drive each pixel in display device.Currently, generally using single channel booster circuit
(Boost circuit) generates voltage AVDD, and switching frequency is constant.However, the size due to the load in display device is working
When can change, it is unstable to will lead to voltage AVDD in this way, larger ripple is also easy to produce, to influence the stabilization of Gamma voltage
Property, and then influence picture display quality.
Summary of the invention
The embodiment of the present invention provides a kind of voltage compensating circuit, its voltage compensating method, drive system and display device, uses
To improve the stability of voltage AVDD.
The embodiment of the invention provides a kind of voltage compensating circuits, comprising: bleeder circuit, detection output circuit and boosting
Control circuit；
The bleeder circuit is configured as that comparison voltage will be generated after the voltage of power supply voltage output end；
The detection output circuit is configured as according to the comparison voltage and reference voltage, output detection voltage；
The boost control circuit is configured as exporting the power supply voltage output end according to the detection voltage
Voltage compensate.
Optionally, in embodiments of the present invention, the boost control circuit at least two；
One boost control circuit is configured as when the detection voltage is no more than first threshold voltage, according to institute
The voltage that detection voltage exports the power supply voltage output end is stated to compensate；
At least two boost control circuits are configured as when the detection voltage is greater than the first threshold voltage,
It is compensated according to the voltage that the detection voltage exports the power supply voltage output end.
Optionally, in embodiments of the present invention, it is not more than first threshold voltage, the boosting control for the detection voltage
Circuit processed is specifically configured to work when the detection voltage is no more than second threshold voltage using first switch frequency, right
The voltage of the power supply voltage output end output compensates；The detection voltage be greater than the second threshold voltage and
It when no more than the first threshold voltage, is worked using second switch frequency, to power supply voltage output end output
Voltage compensates；Wherein, the first switch frequency is less than the second switch frequency, and the second threshold voltage is less than institute
State first threshold voltage.
Optionally, in embodiments of the present invention, it is greater than the first threshold voltage, each liter for the detection voltage
Pressure control circuit is specifically configured to be greater than the first threshold voltage in the detection voltage and the detection voltage is not more than
When third threshold voltage, using identical or different third switching frequency operation, the power supply voltage output end is exported
Voltage compensate；When the detection voltage is greater than the third threshold voltage, using the 4th identical or different switch
Frequency work compensates the voltage of power supply voltage output end output.
Optionally, in embodiments of the present invention, the boost control circuit include: inductance, switching transistor, diode,
First resistor, capacitor and boost control chip；Wherein, the enable end of the boost control chip is configured as receiving the inspection
Survey voltage, the grid coupling of output end and the switching transistor；The first end and booster power input terminal of the inductance couple,
The second end of the inductance is coupled with the first pole of the anode of the diode and the switching transistor respectively；The switch
Second pole of transistor and the ground terminal；The cathode of the diode and the power supply voltage output end couple；
The first end of the first resistor and the power supply voltage output end couple, and the second end of the first resistor connects with described
Ground terminal coupling；The first end of the capacitor and the power supply voltage output end couple, the second end of the capacitor with it is described
Ground terminal；And/or
The detection output circuit includes: subtracter, the 4th resistance, the 5th resistance, the 6th resistance and the 7th resistance；Its
In, the first end of the 4th resistance is configured as receiving the comparison voltage, the second end of the 4th resistance respectively with institute
State the first end coupling of the negative-phase input and the 5th resistance of subtracter；The first end of 6th resistance is configured as
The reference voltage is received, the second end of the 6th resistance and the normal phase input end of the subtracter couple；7th electricity
The normal phase input end of the first end of resistance and the subtracter couples, the second end and ground terminal of the 7th resistance；It is described
The second end of the output end of subtracter and the 5th resistance couples, and is configured as exporting the detection voltage.
Optionally, in embodiments of the present invention, the bleeder circuit includes: second resistance and 3rd resistor；
The first end of the second resistance and the power supply voltage output end couple, the second end of the second resistance
It is coupled respectively with the first end of the 3rd resistor and the detection output circuit, is configured as exporting the comparison voltage；
The second end and ground terminal of the 3rd resistor.
Optionally, in embodiments of the present invention, the bleeder circuit further include: gamma voltage generation circuit and pressure stabilizing electricity
Road；Wherein, the first end of the second resistance passes through the gamma voltage generation circuit and the voltage regulator circuit and the power supply
The coupling of supply voltage output end；
The voltage regulator circuit is configured as after the voltage of the power supply voltage output end is reduced predetermined voltage threshold
It is supplied to the gamma voltage generation circuit；
After the gamma voltage generation circuit is configured as the voltage for providing the voltage regulator circuit, it is supplied to described
The first end of second resistance.
Correspondingly, the embodiment of the invention also provides a kind of voltage of voltage compensating circuit provided in an embodiment of the present invention benefits
Compensation method, comprising:
The bleeder circuit will generate comparison voltage after the voltage of power supply voltage output end；
The detection output circuit is according to the comparison voltage and reference voltage, output detection voltage；
The boost control circuit according to the detection voltage, to the voltage of power supply voltage output end output into
Row compensation.
Correspondingly, the embodiment of the invention also provides a kind of drive systems, including voltage provided in an embodiment of the present invention to mend
Repay circuit.
Correspondingly, the embodiment of the invention also provides a kind of display devices, including driving provided in an embodiment of the present invention is
System.
The present invention has the beneficial effect that:
Voltage compensating circuit, its voltage compensating method, drive system and display device provided in an embodiment of the present invention, pass through
Bleeder circuit will generate comparison voltage after the voltage of power supply voltage output end, and by detection output circuit according to than
Compared with voltage and reference voltage, output detection voltage allows detection voltage to reflect the electricity of power supply voltage output end in real time
The ripple of pressure changes.And voltage power supply voltage output end exported by boost control circuit according to detection voltage into
Row compensation, so as to be changed in real time according to the ripple of the voltage of power supply voltage output end, to power supply voltage output
The voltage at end compensates, and to reduce the ripple of the voltage of power supply voltage output end, and then improves the stabilization of Gamma voltage
Property.
Detailed description of the invention
Fig. 1 is the electrical block diagram of Gamma voltage voltage regulation way in the related technology；
Fig. 2 is the electrical block diagram of voltage compensating circuit provided in an embodiment of the present invention；
Fig. 3 is one of the particular circuit configurations schematic diagram of voltage compensating circuit provided in an embodiment of the present invention；
Fig. 4 is the two of the particular circuit configurations schematic diagram of voltage compensating circuit provided in an embodiment of the present invention；
Fig. 5 is the flow chart of voltage compensating method provided in an embodiment of the present invention.
Specific embodiment
In order to make the purpose of the present invention, the technical scheme and advantages are more clear, with reference to the accompanying drawing, to the embodiment of the present invention
The voltage compensating circuit of offer, its voltage compensating method, drive system and display device specific embodiment carry out in detail
Explanation.It should be appreciated that preferred embodiment disclosed below is only configured to the description and interpretation present invention, it is not configured to be limited
The fixed present invention.And in the absence of conflict, the features in the embodiments and the embodiments of the present application can be combined with each other.It needs
It should be noted that the size and shape of each figure do not reflect actual proportions in attached drawing, purpose is schematically illustrate the content of present invention.
And same or similar label indicates same or similar element or element with the same or similar functions from beginning to end.
With the rapid development of field of display technology, display of the people to large scale, high-resolution and high refreshing frequency
The demand of device increases increasingly.Large scale, high-resolution, the display device of high refreshing frequency generally use single channel at present
The voltage AVDD of Boost circuit generation power supply voltage output end.Also, in practical applications, Boost circuit is using fixation
Grid load pulses width modulated (Pulse Width Modulation, PWM) of the switching frequency to switching transistor therein
Signal, with being turned on and off for control switch transistor, to obtain required voltage AVDD.However, current single channel Boost
The switching frequency of circuit is constant, and is influenced by the variation of the size loaded in display device, and curent change is bright in circuit
It is aobvious, it is also easy to produce larger ripple so as to cause voltage AVDD, so that the Gamma spread of voltage that P-Gamma circuit generates, Jin Erying
Ring picture display quality.
Currently, mode used by Gamma voltage pressure stabilizing is the voltage input end increase pressure stabilizing electricity in P-Gamma circuit 02
Road 01, by voltage regulator circuit 01 P-Gamma circuit will be inputed to again after voltage AVDD pressure stabilizing that Boost circuit 03 generates, such as
Shown in Fig. 1.Due to the effect of voltage regulator circuit 01, AVDD_GMA of its output of voltage can be made to be less than voltage AVDD and between the two
With certain pressure difference, accordingly even when voltage AVDD has ripple, as long as would not influence Gamma voltage in pressure differential range.So
And such design is disadvantageous in that the load of large scale, high-resolution and high refreshing frequency display device changes greatly,
The ripple of voltage AVDD is caused easily to exceed pressure differential range, to still will affect the Gamma voltage of generation.
In addition, working if Boost circuit is under relatively large load state for a long time, since electric current is larger, Boost electricity is obtained
The power consumption on road is larger, causes own loss and fever serious.
Based on this, the embodiment of the invention provides a kind of voltage compensating circuits, as shown in Figure 2, comprising: bleeder circuit 10,
Detect output circuit 20 and boost control circuit 30_m (1≤m≤M, and m is integer；M is the sum of boost control circuit, figure
2 by taking M=2 as an example).Wherein, bleeder circuit 10 is configured as after dividing the voltage AVDD of power supply voltage output end avdd
Generate comparison voltage.Detection output circuit 20 is configured as according to comparison voltage and reference voltage VF, output detection voltage.Boosting
Control circuit 30_m is configured as mending the voltage AVDD of power supply voltage output end avdd output according to detection voltage
It repays.
Voltage compensating circuit provided in an embodiment of the present invention, by bleeder circuit by the voltage of power supply voltage output end
Comparison voltage is generated after partial pressure, and by detection output circuit according to comparison voltage and reference voltage, output detects voltage, so that
Detection voltage can reflect the ripple variation of the voltage of power supply voltage output end in real time.And pass through boost control circuit root
It is compensated according to the voltage that detection voltage exports power supply voltage output end, so as in real time according to power supply voltage
The ripple of the voltage of output end changes, and compensates to the voltage of power supply voltage output end, to reduce power supply voltage
The ripple of the voltage of output end, and then improve the stability of Gamma voltage.
Combined with specific embodiments below, the present invention is described in detail.It should be noted that be in the present embodiment in order to
It preferably explains the present invention, but does not limit the present invention.
In the specific implementation, as shown in Fig. 2, boost control circuit 30_m at least can be two.For example, can be set 2
A, 3,4 or more, this needs to design determination according to actual application environment, is not limited thereto.Implement in the present invention
In example, when detecting voltage no more than first threshold voltage, in order to reduce power consumption, one of boost control circuit can control
It works, is compensated with the voltage AVDD exported to power supply voltage output end avdd.Specifically, a boosting rectifier control
Circuit is configured as when detecting voltage no more than first threshold voltage, according to detection voltage to power supply voltage output end
The voltage AVDD of avdd output is compensated.When boost control circuit is set as two, i.e. the first boost control circuit 30_1
With the second boost control circuit 30_2.First boost control circuit 30_1 can be configured as in detection voltage no more than the first threshold
When threshold voltage, the power supply voltage output end avdd voltage AVDD exported is compensated according to detection voltage.Further,
It is not more than first threshold voltage for detection voltage, the first boost control circuit 30_1 is specifically configured to little in detection voltage
It when second threshold voltage, is worked using first switch frequency, to the voltage AVDD of power supply voltage output end avdd output
It compensates；When detecting voltage greater than second threshold voltage and being not more than first threshold voltage, using second switch frequency work
Make, the voltage AVDD of power supply voltage output end avdd output is compensated；Wherein, first switch frequency is opened less than second
Frequency is closed, second threshold voltage is less than first threshold voltage.
In the specific implementation, in embodiments of the present invention, when detecting voltage greater than first threshold voltage, in order to effective
The voltage of power supply voltage output end is compensated, wherein at least two boost control circuit is can control and works.
Specifically, at least two boost control circuits are configured as when detecting voltage greater than first threshold voltage, according to detection voltage
The voltage of power supply voltage output end output is compensated.As shown in Fig. 2, when boost control circuit is set as two,
First boost control circuit 30_1 and the second boost control circuit 30_2 is all in accordance with detection voltage to power supply voltage output end
The voltage AVDD of avdd output is compensated.
In the specific implementation, it is greater than first threshold voltage, in embodiments of the present invention, each boosting rectifier control for detection voltage
Circuit is specifically configured to use when detecting voltage greater than first threshold voltage and detection voltage is no more than third threshold voltage
Identical or different third switching frequency operation compensates the voltage of power supply voltage output end output.Specifically, such as
Shown in Fig. 2, when boost control circuit is set as two, the first boost control circuit 30_1 is greater than first threshold in detection voltage
Voltage and detection voltage be not more than third threshold voltage when, using third switching frequency operation, to power supply voltage output
The voltage AVDD of end avdd output is compensated.Second boost control circuit 30_2 detection voltage be greater than first threshold voltage and
When detecting voltage no more than third threshold voltage, using third switching frequency operation, to power supply voltage output end avdd
The voltage AVDD of output is compensated.At this point, the third switching frequency that the first boost control circuit 30_1 is used can be with second
The third switching frequency that boost control circuit 30_2 is used is identical.Alternatively, the third that the first boost control circuit 30_1 is used is opened
The third switching frequency that the second boost control circuit 30_2 is used can be greater than by closing frequency.Alternatively, the first boost control circuit 30_
The 1 third switching frequency used might be less that the third switching frequency that the second boost control circuit 30_2 is used, and not make herein
It limits.
In the specific implementation, in embodiments of the present invention, third switching frequency can be opened with first switch frequency and second
One closed in frequency is identical.Alternatively, third switching frequency can also be greater than in first switch frequency and second switch frequency
One.Alternatively, third switching frequency might be less that one in first switch frequency and second switch frequency, do not limit herein
It is fixed.
Further, in the specific implementation, it is greater than first threshold voltage for detection voltage, in embodiments of the present invention,
Each boost control circuit is specifically configured to open when detecting voltage greater than third threshold voltage using the identical or different the 4th
Frequency work is closed, the voltage of power supply voltage output end output is compensated.Specifically, as shown in Fig. 2, in boosting rectifier control
When circuit is set as two, the first boost control circuit 30_1 is opened when detecting voltage greater than third threshold voltage using the 4th
Frequency work is closed, is compensated with the voltage AVDD exported to power supply voltage output end avdd.Second boost control circuit
30_2 is when detecting voltage greater than third threshold voltage, using the 4th switching frequency operation, to power supply voltage output end
The voltage AVDD of avdd output is compensated.At this point, the 4th switching frequency that the first boost control circuit 30_1 is used can be with
The 4th switching frequency that second boost control circuit 30_2 is used is identical.Alternatively, the first boost control circuit 30_1 use the
Four switching frequencies can be greater than the 4th switching frequency that the second boost control circuit 30_2 is used.Alternatively, the first boosting rectifier control is electric
The 4th switching frequency that road 30_1 is used might be less that the 4th switching frequency that the second boost control circuit 30_2 is used, herein
It is not construed as limiting.
In the specific implementation, in embodiments of the present invention, the 4th switching frequency can be with first switch frequency, second switch
One in frequency and third switching frequency is identical.Alternatively, the 4th switching frequency can also be greater than first switch frequency, second
One in switching frequency and third switching frequency.Alternatively, the 4th switching frequency might be less that first switch frequency, second
It one in switching frequency and third switching frequency, is not limited thereto.
In the specific implementation, the third switching frequency that the first boost control circuit 30_1 is used can be with second switch frequency
Identical, the third switching frequency that the second boost control circuit 30_2 is used can be identical as first switch frequency；First boosting control
The 4th switching frequency that circuit 30_1 processed is used can be identical as second switch frequency, what the second boost control circuit 30_2 was used
4th switching frequency can be identical as second switch frequency.It can make the first boost control circuit and the second boosting rectifier control electricity in this way
Road uses identical circuit structure, so as to reduce circuit design difficulty.
In the specific implementation, in embodiments of the present invention, as shown in Figure 3 and Figure 4, boost control circuit 30_m can wrap
It includes: inductance L0, switching transistor M0, diode D0, first resistor R1, capacitor C0 and boost control chip IC_m；Wherein, it opens
The first pole for closing transistor M0 can be used as its source electrode, and the second pole can be used as its drain electrode；Alternatively, the first pole can be used as its leakage
Pole, the second pole can be used as its source electrode, is not limited thereto.
The enable end of boost control chip IC_m is configured as receiving detection voltage, the grid of output end and switching transistor M0
Pole coupling.Wherein, boost control chip IC_m can be essentially identical with structure in the prior art, is not limited thereto.
The first end and booster power input terminal VIN of inductance L0 couples, and the second end of inductance L0 is respectively with diode D0's
The coupling of the first pole of anode and switching transistor M0.
The second pole of switching transistor M0 and ground terminal GND are coupled.
The cathode and power supply voltage output end avdd of diode D0 couples.
The first end of first resistor R1 and power supply voltage output end avdd are coupled, the second end of first resistor R1 with connect
Ground terminal GND coupling.
The first end and power supply voltage output end avdd of capacitor C0 couples, the second end and ground terminal GND of capacitor C0
Coupling.
In the specific implementation, boost control chip IC_m can load PWM letter to the grid of the switching transistor M0 of connection
Number, with being turned on and off for control switch transistor M0.Also, the boosting principle of above-mentioned boost control circuit in the prior art
It is essentially identical, be it will be apparent to an ordinarily skilled person in the art that, this will not be repeated here, also should not be used as to of the invention
Limitation.
Since when voltage AVDD has ripple, the voltage variety Δ VB that ripple generates meets formula: Δ VB=Δ I*
ESR；Wherein, when Δ I represents voltage AVDD with ripple, the variable quantity of the electric current flowed through in voltage compensating circuit circuit, ESR generation
The equivalent resistance in the entire circuit of table voltage compensating circuit.Also,Wherein, Dz represents the duty ratio of pwm signal, f
The switching frequency of representation switch transistor M0, l0 represent the inductance of inductance L0.Due to the voltage of duty ratio and the AVDD of output
Value is related, therefore cannot improve the influence of ripple by adjusting duty ratio.Also, since inductance increases, it will lead to power consumption
It is improved with cost.Therefore in the case where not changing duty ratio and inductance, the switch of change switching transistor M0 can be passed through
Frequency f adjusts Δ VB.
It is below two to be illustrated with boost control circuit, second threshold voltage can be set to voltage AVDD and exist
When not generating the ripple of ripple or generation within allowable range of error, the comparison generated after the partial pressure of bleeder circuit 10 is electric
Pressure.It, can be when detecting voltage no more than second threshold voltage in this way using second threshold voltage as reference voltage, account for voltage
AVDD does not generate ripple or it is very small to load variation within allowable range of error at this time for the ripple of generation, and in order to drop
Low-power consumption can only make the first boost control circuit 30_1 carry out work according to the first switch frequency compared with low switching frequency at this time
Make.When detecting voltage greater than second threshold voltage, account for voltage AVDD generates ripple or the ripple of generation not to be allowed in error
Within the scope of, in this way in order to inhibit the output ripple to need using higher switching frequency, however since detection voltage is not more than
First threshold voltage, account for voltage AVDD generate ripple it is smaller or generate ripple biased error allowed band it is smaller, in this way
In order to reduce power consumption, the first boost control circuit 30_1 can only be made to carry out work according to the second switch frequency of higher switching frequency
Make.Further, when detecting voltage greater than first threshold voltage and being not more than third threshold voltage, account for voltage AVDD is generated
Ripple it is larger or the ripple biased error allowed band that generates is larger, in this way in order to inhibit the output ripple and share first liter
The electric current for pressing control circuit 30_1, can be in the first boost control circuit 30_1 according to the second switch frequency of higher switching frequency
On the basis of being worked, the second boost control circuit 30_2 is made to be worked according to third switching frequency.So as to pass through
Second boost control circuit 30_2 shares the electric current of the first boost control circuit 30_1, that is, will be originally merely through first liter
The electric current of pressure control circuit 30_1 gives the first boost control circuit 30_1 and the second boost control circuit 30_2, so that first liter
Control circuit 30_1 and the load of the second boost control circuit 30_2 shared are pressed, so that ripple be made to reduce, improves the electricity of output
Press the stability of AVDD.Also, due to using the first boost control circuit 30_1 and the second common work of boost control circuit 30_2
Make that the circuit temperature of the first boost control circuit 30_1 and the second boost control circuit 30_2 can also be reduced with share current,
So as to improve circuit heating problem, circuit lifetime is improved.
When detecting voltage greater than third threshold voltage, the ripple that account for voltage AVDD is generated is further larger or generation
Ripple biased error allowed band further increases, can be in the first boost control circuit in this way in order to inhibit the output ripple
On the basis of 30_1 is worked according to the second switch frequency of higher switching frequency, make the second boost control circuit 30_2 according to
4th switching frequency of higher switching frequency works, to reduce the output ripple of voltage AVDD.
In the specific implementation, second threshold voltage and third threshold voltage can design really according to actual application environment
It is fixed, it is not limited thereto.
In the specific implementation, in embodiments of the present invention, as shown in Figure 3 and Figure 4, detection output circuit 20 may include:
Subtracter OP, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6 and the 7th resistance R7；Wherein,
The first end of 4th resistance R4 be configured as receive comparison voltage, the second end of the 4th resistance R4 respectively with subtracter
The coupling of the first end of the negative-phase input of OP and the 5th resistance R5；
The first end of 6th resistance R6 is configured as receiving reference voltage VF, the second end and subtracter OP of the 6th resistance R6
Normal phase input end coupling；
The first end of 7th resistance R7 and the normal phase input end of subtracter OP couple, the second end of the 7th resistance R7 and ground connection
Hold GND coupling；
The coupling of the second end of the output end of subtracter OP and the 5th resistance R5 is configured as output detection voltage.
In the specific implementation, in embodiments of the present invention, the resistance value of the 4th resistance R4 can be with the electricity of the 5th resistance R5
Resistance value is identical, and the 6th resistance R6 is identical as the resistance value of the 7th resistance R7.Then detecting voltage VS can satisfy formula:Can make in this way VS represent voltage AVDD after variation between reference voltage
Voltage variety.
In the specific implementation, in embodiments of the present invention, as shown in figure 3, bleeder circuit 10 may include: second resistance R2
With 3rd resistor R3；Wherein, the first end of second resistance R2 and power supply voltage output end avdd are coupled, second resistance R2's
Second end is coupled with the first end of 3rd resistor R3 and detection output circuit 20 respectively, is configured as output comparison voltage, the
The second end and ground terminal GND of three resistance R3 couples.Wherein, comparison voltage VG meets formula:Its
In, r2 represents the resistance value of second resistance R2, and r3 represents the resistance value of 3rd resistor R3.
Further, in the specific implementation, in embodiments of the present invention, as shown in figure 4, bleeder circuit 10 can also wrap
It includes: gamma voltage generation circuit 11 and voltage regulator circuit 12；Wherein, the first end of second resistance R2 passes through gamma voltage generation circuit
11 and voltage regulator circuit 12 and power supply voltage output end avdd is coupled.Wherein, voltage regulator circuit 12 is configured as power supply
The voltage of voltage output end avdd is supplied to gamma voltage generation circuit 12 after reducing predetermined voltage threshold.Gamma electric voltage generates electricity
After road 12 is configured as the voltage for providing voltage regulator circuit 11, it is supplied to the first end of second resistance R2.Voltage regulator circuit 12
The voltage of output is AVDD- Δ V；Wherein, Δ V represents predetermined voltage threshold.Gamma voltage generation circuit 12 is by AVDD- Δ V points
The voltage exported after pressure is V1.Make in this wayFurther, V1 can be one in Gamma voltage,
The fluctuation of the response fluctuation AVDD voltage of Gamma voltage can be passed through in this way.In practical applications, predetermined voltage threshold, r3, r4
Determination can be designed according to actual application environment, be not limited thereto.Specifically, gamma voltage generation circuit 11 may include
P-Gamma voltage generation circuit.Voltage regulator circuit 12 may include voltage-stabiliser tube.Certainly, in practical applications, gamma electric voltage generates electricity
Road 11 and voltage regulator circuit 12 can also with it is in the prior art essentially identical, be not limited thereto.
Below by taking structure shown in Fig. 4 as an example, to the course of work of voltage compensating circuit provided in an embodiment of the present invention into
Row description.
Voltage regulator circuit 12 carries out pressure stabilizing, the then electricity exported after pressure stabilizing to the voltage AVDD of power supply voltage output end avdd
Pressure is AVDD- Δ V.Output voltage V1, such second resistance R2 and the after gamma voltage generation circuit 12 divides AVDD- Δ V
Three resistance R3 divide to export comparison voltage voltage V1It, can be with by the effect of subtracter OP
Output detection voltage VS,
Boost control chip IC_1 and IC_2 receive detection voltage VS respectively, in detection voltage VS no more than second threshold electricity
When pressure, account for voltage AVDD does not generate the ripple of ripple or generation within allowable range of error, i.e., load variation at this time is very
It is small, and in order to reduce power consumption, the switching transistor M0 of boost control chip IC_2 control connection does not work, so that the second boosting
Control circuit 30_2 does not work.Boost control chip IC_1 has first switch frequency to the switching transistor M0 of connection output
Pwm signal, with being turned on and off for control switch transistor M0, so as to so that the first boost control circuit 30_1 uses first
Switching frequency operation compensates the voltage AVDD of power supply voltage output end avdd output, and then reduces voltage AVDD
Ripple, improve the stability of the voltage AVDD of output.
When detecting voltage VS greater than second threshold voltage, account for voltage AVDD generates the ripple of ripple or generation not accidentally
Within poor allowed band, in this way in order to inhibit the output ripple to need using higher switching frequency, however due to detecting voltage
VS be not more than first threshold voltage, account for voltage AVDD generate ripple it is smaller or generate ripple biased error allowed band compared with
Small, so in order to reduce power consumption, the switching transistor M0 of boost control chip IC_2 control connection does not work, so that the second boosting
Control circuit 30_2 does not work.Boost control chip IC_1 has higher switching frequency to the switching transistor M0 of connection output
The pwm signal of second switch frequency, with being turned on and off for control switch transistor M0, so as to so that the first boosting rectifier control is electric
Road 30_1 is worked using second switch frequency, is compensated with the voltage AVDD exported to power supply voltage output end avdd,
And then reduce the ripple of voltage AVDD, improve the stability of the voltage AVDD of output.
When detecting voltage greater than first threshold voltage and detection voltage is not more than third threshold voltage, account for voltage AVDD
The ripple of generation is larger or the ripple biased error allowed band that generates is larger, in this way in order to inhibit the output ripple and share the
The electric current of one boost control circuit can be carried out in the first boost control circuit according to the second switch frequency of higher switching frequency
On the basis of work, believed by boost control chip IC_2 to the PWM that the switching transistor M0 of connection exports third switching frequency
Number, with being turned on and off for control switch transistor M0, so as to so that the second boost control circuit 30_2 is switched according to third
Frequency works.The electric current of the first boost control circuit 30_1 can be shared by the second boost control circuit 30_2 in this way,
So that the first boost control circuit 30_1 and the load of the second boost control circuit 30_2 shared, so that ripple be made to reduce, mention
The stability of the voltage AVDD of height output.Wherein, third switching frequency is identical as first switch frequency.
When detecting voltage greater than third threshold voltage, the ripple that account for voltage AVDD is generated is further larger or generation
Ripple biased error allowed band is further larger, can be in the first boost control circuit in this way in order to inhibit the output ripple
On the basis of 30_1 is worked according to the second switch frequency of higher switching frequency, by boost control chip IC_2 to connection
Switching transistor M0 export higher switching frequency the 4th switching frequency pwm signal, with leading for control switch transistor M0
It is logical and close, so as to further make ripple so that the second boost control circuit 30_2 works according to the 4th switching frequency
Reduce, improves the stability of the voltage AVDD of output.Wherein, the 4th switching frequency is identical as second switch frequency.
Based on the same inventive concept, the embodiment of the invention also provides a kind of voltage compensation electricity provided in an embodiment of the present invention
The voltage compensating method on road, the principle which solves the problems, such as is similar to aforesaid voltage compensation circuit, therefore the electricity
The implementation of pressure compensation method may refer to the implementation of aforesaid voltage compensation circuit, and repeating place, details are not described herein.
As shown in figure 5, voltage compensating method provided in an embodiment of the present invention, may include steps of:
S501, bleeder circuit will generate comparison voltage after the voltage of power supply voltage output end；
S502, detection output circuit are according to comparison voltage and reference voltage, output detection voltage；
S503, boost control circuit compensate the voltage of power supply voltage output end output according to detection voltage.
In the specific implementation, boost control circuit at least two are not more than in detection voltage in embodiments of the present invention
When first threshold voltage, a boost control circuit carries out the voltage that power supply voltage output end exports according to detection voltage
Compensation.
When detecting voltage greater than first threshold voltage, at least two boost control circuits are according to detection voltage to power supply electricity
The voltage of source voltage output end output compensates.
In the specific implementation, it is not more than first threshold voltage for detection voltage, in embodiments of the present invention, in detection electricity
When pressure is no more than second threshold voltage, boost control circuit is worked using first switch frequency, to power supply voltage output end
The voltage of output compensates.
When detecting voltage greater than second threshold voltage and being not more than first threshold voltage, boost control circuit uses second
Switching frequency operation compensates the voltage of power supply voltage output end output.
In the specific implementation, it is greater than first threshold voltage for detection voltage, in embodiments of the present invention, in detection voltage
Greater than first threshold voltage and when detection voltage is not more than third threshold voltage, each boost control circuit is using identical or different
Third switching frequency operation compensates the voltage of power supply voltage output end output.
When detecting voltage greater than third threshold voltage, each boost control circuit is using the 4th identical or different switch frequency
Rate work compensates the voltage of power supply voltage output end output.
Based on the same inventive concept, the embodiment of the invention also provides a kind of drive systems, including the embodiment of the present invention to mention
The above-mentioned voltage compensating circuit supplied.Also, other essential component parts for the drive system are this field
Those of ordinary skill should be understood that have, and this will not be repeated here, also should not be taken as limiting the invention.The drive system
Implementation may refer to the embodiment of above-mentioned voltage compensating circuit, and overlaps will not be repeated.
Based on the same inventive concept, the embodiment of the invention also provides a kind of display devices, including the embodiment of the present invention to mention
The above-mentioned drive system supplied.The display device can be with are as follows: mobile phone, tablet computer, television set, display, laptop, number
Any products or components having a display function such as photo frame, navigator.For other essential compositions of the display device
Part is it will be apparent to an ordinarily skilled person in the art that having, and this will not be repeated here, also should not be used as to of the invention
Limitation.The implementation of the display device may refer to the embodiment of above-mentioned voltage compensating circuit, and overlaps will not be repeated.
Voltage compensating circuit, its voltage compensating method, drive system and display device provided in an embodiment of the present invention, pass through
Bleeder circuit will generate comparison voltage after the voltage of power supply voltage output end, and by detection output circuit according to than
Compared with voltage and reference voltage, output detection voltage allows detection voltage to reflect the electricity of power supply voltage output end in real time
The ripple of pressure changes.And voltage power supply voltage output end exported by boost control circuit according to detection voltage into
Row compensation, so as to be changed in real time according to the ripple of the voltage of power supply voltage output end, to power supply voltage output
The voltage at end compensates, and to reduce the ripple of the voltage of power supply voltage output end, and then improves the stabilization of Gamma voltage
Property.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (10)
1. a kind of voltage compensating circuit characterized by comprising bleeder circuit, detection output circuit and boost control circuit；
The bleeder circuit is configured as that comparison voltage will be generated after the voltage of power supply voltage output end；
The detection output circuit is configured as according to the comparison voltage and reference voltage, output detection voltage；
The boost control circuit is configured as according to the detection voltage, to the electricity of power supply voltage output end output
Pressure compensates.
2. voltage compensating circuit as described in claim 1, which is characterized in that the boost control circuit at least two；
One boost control circuit is configured as when the detection voltage is no more than first threshold voltage, according to the inspection
The voltage that voltage exports the power supply voltage output end is surveyed to compensate；
At least two boost control circuits are configured as when the detection voltage is greater than the first threshold voltage, according to
The voltage that the detection voltage exports the power supply voltage output end compensates.
3. voltage compensating circuit as claimed in claim 2, which is characterized in that be not more than first threshold for the detection voltage
Voltage, the boost control circuit are specifically configured to when the detection voltage is no more than second threshold voltage, using first
Switching frequency operation compensates the voltage of power supply voltage output end output；It is greater than institute in the detection voltage
When stating second threshold voltage and being not more than the first threshold voltage, worked using second switch frequency, to the power supply
The voltage of voltage output end output compensates；Wherein, the first switch frequency is less than the second switch frequency, and described the
Two threshold voltages are less than the first threshold voltage.
4. voltage compensating circuit as claimed in claim 2, which is characterized in that be greater than first threshold for the detection voltage
Threshold voltage, each boost control circuit are specifically configured to be greater than the first threshold voltage and described in the detection voltage
When detecting voltage no more than third threshold voltage, using identical or different third switching frequency operation, to the power supply
The voltage of voltage output end output compensates；When the detection voltage is greater than the third threshold voltage, using identical or
The 4th different switching frequency operations compensates the voltage of power supply voltage output end output.
5. voltage compensating circuit as described in claim 1, which is characterized in that the boost control circuit includes: inductance, switch
Transistor, diode, first resistor, capacitor and boost control chip；Wherein, the enable end of the boost control chip is matched
It is set to and receives the detection voltage, the grid of output end and the switching transistor couples；The first end and boosting of the inductance
Power input coupling, the second end of the inductance respectively with the anode of the diode and the switching transistor first
Pole coupling；Second pole of the switching transistor and the ground terminal；The cathode of the diode and the power supply
Voltage output end coupling；The first end of the first resistor and the power supply voltage output end couple, the first resistor
Second end and the ground terminal；The first end of the capacitor and the power supply voltage output end couple, the electricity
The second end of appearance and the ground terminal；And/or
The detection output circuit includes: subtracter, the 4th resistance, the 5th resistance, the 6th resistance and the 7th resistance；Wherein,
The first end of 4th resistance is configured as receiving the comparison voltage, and the second end of the 4th resistance subtracts with described respectively
The coupling of the first end of the negative-phase input of musical instruments used in a Buddhist or Taoist mass and the 5th resistance；The first end of 6th resistance is configured as receiving
The reference voltage, the second end of the 6th resistance and the normal phase input end of the subtracter couple；7th resistance
The normal phase input end of first end and the subtracter couples, the second end and ground terminal of the 7th resistance；The subtraction
The second end of the output end of device and the 5th resistance couples, and is configured as exporting the detection voltage.
6. voltage compensating circuit as described in claim 1, which is characterized in that the bleeder circuit includes: second resistance and the
Three resistance；
The first end of the second resistance and the power supply voltage output end couple, the second end difference of the second resistance
It is coupled with the first end of the 3rd resistor and the detection output circuit, is configured as exporting the comparison voltage；
The second end and ground terminal of the 3rd resistor.
7. voltage compensating circuit as claimed in claim 6, which is characterized in that the bleeder circuit further include: gamma electric voltage produces
Raw circuit and voltage regulator circuit；Wherein, the first end of the second resistance passes through the gamma voltage generation circuit and the pressure stabilizing
Circuit and the power supply voltage output end couple；
The voltage regulator circuit is configured as providing after the voltage of the power supply voltage output end is reduced predetermined voltage threshold
To the gamma voltage generation circuit；
After the gamma voltage generation circuit is configured as the voltage for providing the voltage regulator circuit, it is supplied to described second
The first end of resistance.
8. a kind of voltage compensating method of such as described in any item voltage compensating circuits of claim 1-7, which is characterized in that packet
It includes:
The bleeder circuit will generate comparison voltage after the voltage of power supply voltage output end；
The detection output circuit is according to the comparison voltage and reference voltage, output detection voltage；
The boost control circuit mends the voltage of power supply voltage output end output according to the detection voltage
It repays.
9. a kind of drive system, which is characterized in that including such as described in any item voltage compensating circuits of claim 1-7.
10. a kind of display device, which is characterized in that including drive system as claimed in claim 9.
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| CN201910012467.0A CN109545123A (en) | 2019-01-07 | 2019-01-07 | Voltage compensating circuit, its voltage compensating method, drive system and display device |
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| CN201910012467.0A CN109545123A (en) | 2019-01-07 | 2019-01-07 | Voltage compensating circuit, its voltage compensating method, drive system and display device |
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