CN106782425B - Input voltage rise time control circuit - Google Patents
Input voltage rise time control circuit Download PDFInfo
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- CN106782425B CN106782425B CN201710204095.2A CN201710204095A CN106782425B CN 106782425 B CN106782425 B CN 106782425B CN 201710204095 A CN201710204095 A CN 201710204095A CN 106782425 B CN106782425 B CN 106782425B
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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
- G09G3/34—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 by control of light from an independent source
- G09G3/36—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 by control of light from an independent source using liquid crystals
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Abstract
The present invention provides a kind of input voltage rise time control circuit.The input voltage rise time control circuit in panel driving unit by being arranged voltage control unit, voltage control unit includes: voltage rate of rise detecting unit, first comparator, second comparator, control unit, and capacitor cell, voltage rate of rise detecting unit is detected the voltage rate of rise of the second end of capacitor cell and is exported to first comparator and the second comparator, the first comparator, and second comparator the voltage rate of rise is compared with the second slope of the first slope of corresponding preset minimum available machine time and corresponding preset maximum available machine time respectively, control module changes the capacitance of the capacitor cell according to comparison result, the voltage of second end to adjust capacitor cell rises to the time of input voltage, the control panel available machine time meets normal boot-strap time range, improve product quality.
Description
Technical field
The present invention relates to technical field of integrated circuits more particularly to a kind of input voltage rise time control circuits.
Background technique
With the development of display technology, the planes such as liquid crystal display (Liquid Crystal Display, LCD) display dress
It sets because having many advantages, such as that high image quality, power saving, fuselage is thin and has a wide range of application, and is widely used in mobile phone, TV, a number
The various consumer electrical products such as word assistant, digital camera, laptop, desktop computer, become the master in display device
Stream.
Liquid crystal display device on existing market is largely backlight liquid crystal display comprising liquid crystal display panel and
Backlight module (Backlight Module).The working principle of liquid crystal display panel is put in the parallel glass substrate of two panels
Liquid crystal molecule is set, there are many tiny electric wires vertically and horizontally for two panels glass substrate centre, control liquid crystal whether by being powered
The light refraction of backlight module is come out and generates picture by molecular changes direction.
Usual liquid crystal display panel is by color film (CF, Color Filter) substrate, thin film transistor (TFT) (TFT, Thin Film
Transistor) substrate, the liquid crystal (LC, Liquid Crystal) that is sandwiched between color membrane substrates and thin film transistor base plate and close
Sealing frame (Sealant) composition, moulding process generally comprise: leading portion array (Array) processing procedure (film, yellow light, etching and stripping
Film), middle section is at box (Cell) processing procedure (TFT substrate is bonded with CF substrate) and back segment module group assembling processing procedure (driving IC and printing electricity
Road plate pressing).Wherein, leading portion Array processing procedure mainly forms TFT substrate, in order to control the movement of liquid crystal molecule；Middle section
Cell processing procedure mainly adds liquid crystal between TFT substrate and CF substrate；Back segment module group assembling processing procedure mainly drives IC pressing
With the integration of printed circuit board, and then drive liquid crystal molecule rotation, show image.
The available machine time of continuous improvement with consumer to product quality requirement, liquid crystal display panel closes as consumer
One of focus of note, and the available machine time of liquid crystal display panel and the rise time of the input voltage of liquid crystal display panel are (defeated
Enter voltage to be switched on the time needed for voltage from zero to panel) it is related, it is too short when the rise time of input voltage, it will lead to surge electricity
It is too big to flow (Inrush Current), it will the integrated circuit on impact panel, and then integrated circuit is damaged, when input voltage
Rise time is too long, and it is too long to will lead to the available machine time, causes customer complaint, therefore the available machine time of usually liquid crystal display panel needs
It is maintained between 0.5ms to 10ms.As shown in Figure 1, being a kind of existing input voltage rise time control circuit, comprising: machine
Core plate 101, the panel driving unit 102 being electrically connected with the machine core board 101, the panel driving unit 102 are equipped with simultaneously
Multiple capacitor C10 of connection, the first end of the multiple capacitor C10 are electrically connected with machine core board 101, and second end is grounded, institute
It states machine core board 101 and inputs a machine core board voltage Vin12 and one input voltage vin 1 of the backward output of panel driving unit 102, pass through
The rise time of the quantity control input voltage vin 1 of capacitor C10 in control panel driving unit 102, and then control panel is opened
The machine time, capacitor C10 quantity is more, and 1 rise time of input voltage vin is longer, and the available machine time of panel is longer, capacitor C10 number
Amount is fewer, and 1 rise time of input voltage vin is shorter, and the available machine time of panel is shorter, this kind of input voltage rise time control electricity
Road cannot be guaranteed that the arrange in pairs or groups machine core board 101 of any specification of the panel driving unit 102 can make the available machine time of panel in 0.5ms
To between 10ms, it will influence product quality.
Summary of the invention
The purpose of the present invention is to provide a kind of input voltage rise time control circuits, can adjust the upper of input voltage
It rises the time, and then the control panel available machine time meets normal boot-strap time range, improves product quality.
To achieve the above object, the present invention provides a kind of input voltage rise time control circuit, comprising: machine core board, with
The panel driving unit that the machine core board is electrically connected, the panel driving unit are electrically connected load；The panel driving list
Member includes: the voltage control unit being electrically connected with the machine core board；
The voltage control unit includes: voltage rate of rise detecting unit, first comparator, the second comparator, control
Module and capacitor cell；The input terminal of the voltage rate of rise detecting unit is electrically connected the output end of machine core board, the electricity
The output end of rate of rise detecting unit is pressed to be electrically connected the non-inverting input terminal of first comparator, the same phase of the second comparator simultaneously
Input terminal；The inverting input terminal of the first comparator receives first slope, and the output end of the first comparator is electrically connected
The first input end of control module；The inverting input terminal of second comparator receives the second slope, second comparator
Second input terminal of output end electric connection control module；The first end of the capacitor cell is electrically connected the output of control module
End, the second end of the capacitor cell are electrically connected the output end of machine core board；When first slope is corresponding preset minimum booting
Between capacitor cell second end the voltage rate of rise, the second slope is the capacitor cell of corresponding preset maximum available machine time
Second end the voltage rate of rise；
The output end of the machine core board exports an input voltage to panel driving unit；The voltage rate of rise detecting is single
The voltage rate of rise of the second end of member detecting capacitor cell, and the voltage rate of rise is exported to first comparator and second and is compared
Compared with the non-inverting input terminal of device, the voltage rate of rise is compared by the first comparator with first slope, and to control module
Export the first comparison result；The voltage rate of rise is compared by second comparator with the second slope, and to control module
Export the second comparison result；The control module changes the capacitor list according to first comparison result and the second comparison result
The capacitance of member, so that the voltage for adjusting the second end of capacitor cell rises to the time of input voltage.
When second comparison result be the voltage rate of rise less than the second slope when, the control module controls the electricity
The capacitance for holding unit reduces, so that the voltage for reducing the second end of capacitor cell rises to the time of input voltage；
When first comparison result is that the voltage rate of rise is greater than first slope, the control module controls the electricity
The capacitance for holding unit increases, so that the voltage for increasing the second end of capacitor cell rises to the time of input voltage.
When first comparison result is that the voltage rate of rise is less than first slope and is greater than the second slope, the control
Module does not change the capacitance of capacitor cell.
The capacitor cell include: multiple field-effect tube and with the multiple field-effect tube multiple capacitors correspondingly；
The grid of the multiple field-effect tube is electrically connected control module, source grounding, and drain electrode is electrically connected the of corresponding capacitor
One end；The second end of the multiple capacitor is electrically connected the output end of machine core board；
Described control unit passes through the conducting and the capacitance of cut-off change capacitor cell for controlling multiple field-effect tube respectively.
The panel driving unit further includes the current control unit being electrically connected with the voltage control unit；
The current control unit includes: photo-coupler, first resistor, second resistance, third comparator and the 4th compares
Device；First pin of the photo-coupler is electrically connected the output end of machine core board, and second pin is electrically connected load, third pin
It is electrically connected the first end of second resistance, the 4th pin is electrically connected first node；The second end of the second resistance accesses electricity
Source voltage；The first end of the first resistor is electrically connected first node, second end ground connection；The third comparator it is same mutually defeated
Enter end and be electrically connected first node, inverting input terminal receives the first comparison voltage, and it is defeated that output end is electrically connected control module third
Enter end；The non-inverting input terminal of 4th comparator is electrically connected first node, and inverting input terminal receives the second comparison voltage, defeated
4th input terminal of outlet electric connection control module；
When first comparison voltage is that preset minimum surge current flows into the first pin of photo-coupler, first node
The voltage at place；When second comparison voltage is the first pin that preset maximum surge current flows into photo-coupler, first segment
Voltage at point；
It is described when surge current when the voltage of the second end of capacitor cell rises flows into the first pin of photo-coupler
Voltage at first node is compared by third comparator with the first comparison voltage, and compares knot to control module output third
Fruit；Voltage at first node is compared by the 4th comparator with the second comparison voltage, and to control module output the
Four comparison results；The control module changes the electricity of the capacitor cell according to the third comparison result and the 4th comparison result
Capacity, thus the surge current when voltage for adjusting the second end of capacitor cell rises.
The photo-coupler includes light emitting diode and phototriode；The anode of the light emitting diode is photo-coupler
The first pin, cathode be photo-coupler second pin；The third of the transmitting extremely photo-coupler of the phototriode is drawn
Foot, the 4th pin of current collection extremely photo-coupler.
When the third comparison result be first node at voltage less than the first comparison voltage when, the control module control
The capacitance for making the capacitor cell reduces, thus the surge current when voltage for increasing the second end of capacitor cell rises；
When the 4th comparison result is greater than the second comparison voltage for the voltage at first node, the control module control
The capacitance for making the capacitor cell increases, thus the surge current when voltage for reducing the second end of capacitor cell rises.
When the third comparison result is that voltage at first node is greater than the first comparison voltage, and the described 4th compares knot
Fruit be first node at voltage less than the second comparison voltage when, the control module does not change the capacitor of the capacitor cell
Amount.
The control module is sequence controller；
The voltage rate of rise detecting unit is differentiator.
The preset minimum available machine time is 0.5ms, and the preset maximum available machine time is 10ms.
Beneficial effects of the present invention: input voltage rise time control circuit of the invention, by panel driving unit
Interior setting voltage control unit, voltage control unit include: voltage rate of rise detecting unit, first comparator, second compare
Device, control unit and capacitor cell, voltage rate of rise detecting unit detect the voltage rate of rise of the second end of capacitor cell
And export to first comparator and the second comparator, the first comparator and the second comparator respectively rise the voltage tiltedly
Rate is compared with the second slope of the first slope of corresponding preset minimum available machine time and corresponding preset maximum available machine time
Compared with control module changes the capacitance of the capacitor cell according to comparison result, to adjust the electricity of the second end of capacitor cell
Pressure rises to the time of input voltage, and the control panel available machine time meets normal boot-strap time range, improves product quality.
Detailed description of the invention
For further understanding of the features and technical contents of the present invention, it please refers to below in connection with of the invention detailed
Illustrate and attached drawing, however, the drawings only provide reference and explanation, is not intended to limit the present invention.
In attached drawing,
Fig. 1 is the circuit diagram of existing input voltage rise time control circuit；
Fig. 2 is the circuit diagram of input voltage rise time control circuit of the invention；
Fig. 3 is what the voltage of input voltage rise time control circuit capacitor cell second end of the invention changed over time
Line Chart.
Specific embodiment
Further to illustrate technological means and its effect adopted by the present invention, below in conjunction with preferred implementation of the invention
Example and its attached drawing are described in detail.
Referring to Fig. 2, the present invention provides a kind of input voltage rise time control circuit, comprising: machine core board 1, with it is described
The panel driving unit 2 that machine core board 1 is electrically connected, the connection of panel driving unit 2 load 3；The panel driving unit 2 is wrapped
It includes: the voltage control unit 21 being electrically connected with the machine core board 1；
The voltage control unit 21 includes: voltage rate of rise detecting unit 211, first comparator 212, second compares
Device 213, control module 214 and capacitor cell 215；The input terminal of the voltage rate of rise detecting unit 211 is electrically connected machine
The output end of the output end of core plate 1, the voltage rate of rise detecting unit 211 is electrically connected first comparator 212 simultaneously
The non-inverting input terminal of non-inverting input terminal, the second comparator 213；The inverting input terminal of the first comparator 212 receives first tiltedly
Rate K1, the output end of the first comparator 212 are electrically connected the first input end of control module 214；Second comparator
213 inverting input terminal receives the second slope K 2, and the output end of second comparator 212 is electrically connected control module 214
Second input terminal；The first end of the capacitor cell 215 is electrically connected the output end of control module 214, the capacitor cell 215
Second end be electrically connected machine core board 1 output end；First slope K1 is the capacitor cell of corresponding preset minimum available machine time
The voltage rate of rise of 215 second end, the second slope K 2 are the of the capacitor cell 215 of corresponding preset maximum available machine time
The voltage rate of rise at two ends；
The output end of the machine core board 1 exports an input voltage vin to panel driving unit 2；The voltage rate of rise
Detecting unit 211 detects the second end voltage rate of rise of capacitor cell 215, and the voltage rate of rise is exported to first and is compared
The non-inverting input terminal of device 212 and the second comparator 213, the first comparator 212 is by the voltage rate of rise and first slope K1
It is compared, and exports the first comparison result to control module 214；Second comparator 213 is by the voltage rate of rise and the
Two slope Ks 2 are compared, and export the second comparison result to control module 214；The control module 214 is according to described first
Comparison result and the second comparison result change the capacitance of the capacitor cell 215, to adjust the second end of capacitor cell 215
Voltage rise to time of input voltage vin.
Specifically, the control module 214 can be sequence controller.
Specifically, the voltage rate of rise detecting unit 211 can be differentiator.
Preferably, the preset minimum available machine time is 0.5ms, and the preset maximum available machine time is 10ms.
It should be noted that due to the characteristic of capacitor, the capacitor cell of voltage control unit 21 in panel driving unit 2
The voltage of 215 second ends being electrically connected with 1 output end of machine core board is electric to one input of the output of panel driving unit 2 in machine core board 1
The input voltage vin can't be reached at once after pressure Vin, but linear rise and is somebody's turn to do to input voltage vin within a certain period of time
The input voltage vin rise time influences the available machine time of panel, needs to control the input voltage vin rise time preset
Between maximum available machine time and preset minimum available machine time, referring to Fig. 3, the rise time of input voltage vin and capacitor list
There are proportionate relationships for the voltage slope of first 215 second ends, and the voltage rate of rise is bigger, and the input voltage vin rise time is shorter, electricity
Press the rate of rise smaller, the input voltage vin rise time is longer, therefore the present invention utilizes voltage rate of rise detecting unit 211
Detect capacitor cell 215 second end the voltage rate of rise, by the voltage rate of rise input respectively first comparator 212,
The non-inverting input terminal of second comparator 213, and receive a corresponding preset minimum in the inverting input terminal of first comparator 212 and open
The first slope K1 of machine time receives a corresponding preset maximum available machine time in the anti-phase input point of the second comparator 213
Second slope K 2, first slope K1 and the second slope K 2 by input voltage vin respectively with preset minimum available machine time and pre-
If the maximum available machine time be divided by acquisition, by first comparator 212 and the second comparator 213 respectively by capacitor cell 215
The voltage rate of rise and first slope K1 of second end and the second slope K 2 are compared to obtain the first comparison result and the second ratio
Compared with as a result, and the first, second comparison result is exported to control module 214, control module 214 compares knot according to first, second
Fruit changes the capacitance of capacitor cell 215, and the voltage rate of rise of the second end of capacitor cell 215 is made to be maintained at first slope K1
Between the second slope K 2, it will also be maintained at preset maximum available machine time and pre- the input voltage vin rise time at this time
If the minimum available machine time between, the control panel available machine time meets normal boot-strap time range, improves product quality.
Specifically, the specific work process of input voltage rise time control circuit of the invention is as follows:
When second comparison result be the voltage rate of rise less than the second slope K 2 when namely the second comparison result be it is low
Level, the capacitance that the control module controls the capacitor cell 215 reduces, to reduce the second end of capacitor cell 215
Voltage rise to time of input voltage vin；
When first comparison result be the voltage rate of rise be greater than first slope K1 when namely the first comparison result be height
Level, the capacitance that the control module 214 controls the capacitor cell 215 increases, to increase the second of capacitor cell 215
The voltage at end rises to the time of input voltage vin；
When first comparison result is that the voltage rate of rise is less than first slope K1, and second comparison result is electricity
When the rate of rise being pressed to be greater than the second slope K 2 namely the first comparison result is low potential, when the second comparison result is high potential, institute
The capacitance that control module 214 does not change capacitor cell 215 is stated, the voltage of the second end of capacitor cell 215 rises to input electricity
Press the time of Vin constant.
Specifically, the capacitor cell 215 includes: multiple field-effect tube Q and a pair of with the multiple field-effect tube Q mono-
The multiple capacitor C answered；The grid of the multiple field-effect tube Q is electrically connected control module 214, source grounding, drain electrode electricity
Property connect the first end of corresponding capacitor C；The second end of the multiple capacitor C is electrically connected the output end of machine core board 1；The control
Unit 214 processed passes through the conducting and the quantity of the capacitor C of cut-off change first end ground connection for controlling multiple field-effect tube Q respectively, changes
Become the capacitance of capacitor cell 215.
Further, the multiple field-effect tube Q is N-type field-effect tube, and described control unit 214 passes through the high electricity of output
Position controls multiple field-effect tube Q and opens, and controls multiple field-effect tube Q by output low potential and closes.
Specifically, the panel driving unit 2 further includes the current control being electrically connected with the voltage control unit 21
Unit 22；The voltage control unit 21 passes through the current control unit 22 connection load 3；
The current control unit 22 includes: photo-coupler 221, first resistor R1, second resistance R2, third comparator
222 and the 4th comparator 223；First pin 10 of the photo-coupler 221 is electrically connected the output end of machine core board 1, and second draws
Foot 20 is electrically connected load 3, and third pin 30 is electrically connected the first end of second resistance R2, and the 4th pin 40 is electrically connected first
Node A；The second end of the second resistance R2 accesses supply voltage VCC；The first end of the first resistor R1 is electrically connected the
One node A, second end ground connection；The non-inverting input terminal of the third comparator 222 is electrically connected first node A, inverting input terminal
The first comparison voltage V1 is received, output end is electrically connected the third input terminal of control module 214；4th comparator 223
Non-inverting input terminal is electrically connected first node A, and inverting input terminal receives the second comparison voltage V2, and output end is electrically connected control mould
4th input terminal of block 214；
When the first comparison voltage V1 is that preset minimum surge current flows into the first pin 10 of photo-coupler 221,
Voltage at first node A；The second comparison voltage V2 is that preset maximum surge current flows into the first of photo-coupler 221
Voltage when pin 10, at first node A；
Surge current when the voltage of the second end of capacitor cell 215 rises to input voltage vin flows into photo-coupler
When 221 the first pin 10, the third comparator 222 compares the voltage at first node A with the first comparison voltage V1
Compared with, and third comparison result is exported to control module 214；4th comparator 223 is by the voltage and second at first node A
Comparison voltage V2 is compared, and exports the 4th comparison result to control module 214；Control module 214 is according to the third ratio
Change the capacitance of the capacitor cell 215 compared with result and the 4th comparison result, thus adjust the second end of capacitor cell 215
Surge current when voltage rises.
Specifically, the photo-coupler 221 includes light emitting diode D and phototriode VT；The light emitting diode D's
Anode is the first pin 10 of photo-coupler 221, and cathode is the second pin 20 of photo-coupler 221；The phototriode VT
Transmitting extremely photo-coupler 221 third pin 30, the 4th pin 40 of current collection extremely photo-coupler 221.
It should be noted that due to machine core board 1 output end to 2 output-input voltage Vin of panel driving unit when, capacitor
The voltage for the second end that unit 215 and 1 output end of machine core board are electrically connected, which increases continuously until, reaches input voltage vin, has
Surge current is flowed into from the first pin 10 of photo-coupler 221 namely the anode of light emitting diode D, after light emitting diode D
The cathode of second pin 20 namely light emitting diode D from photo-coupler 221 is exported to load 3, and light emitting diode D is sent out at this time
Light, and luminous intensity and surge current are positively correlated, therefore the voltage of the 4th pin 40 of photo-coupler 221 namely first node A
Voltage is one and the positively related value of surge current, by comparing the voltage input third comparator 222 and the 4th of first node A
The non-inverting input terminal of device 223, while one is received respectively in the inverting input terminal of third comparator 222 and the 4th comparator 223
One comparison voltage V1 and the second comparison voltage V2, the third comparator 222 and the 4th comparator 223 are respectively by first node A
The voltage at place is tied compared with being compared to obtain third comparison result and the 4th with the first comparison voltage V1 and the second comparison voltage V2
Fruit simultaneously exports to control module 214, and control module 214 changes the capacitor list according to third comparison result and the 4th comparison result
Member 215 capacitance, thus adjust the second end of capacitor cell 215 voltage rise when surge current be maintained at it is preset most
Between big surge current and minimum surge current, prevents surge current excessive, the integrated circuit of panel is caused to impact, Jin Eryan
Long panel service life.
Specifically, when the third comparison result be first node A at voltage less than the first comparison voltage V1 when, namely
When third comparison result is low level, the capacitance that the control module 214 controls the capacitor cell 215 is reduced, to increase
The surge current when voltage of the second end of capacitor cell 215 being added to rise；
When the 4th comparison result is greater than the second comparison voltage V2 for the voltage at first node A namely the 4th compares
When relatively result is high level, the capacitance that the control module 214 controls the capacitor cell 215 increases, to reduce capacitor
The surge current when voltage of the second end of unit 215 rises；
When the voltage that the third comparison result is the place first node A is greater than the first comparison voltage V1, and the 4th compares knot
Fruit be voltage at first node A less than the second comparison voltage V2 when namely third comparison result be high level, the 4th compares knot
Fruit is low level, and the control module 214 does not change the capacitance of the capacitor cell 215, the second end of capacitor cell 215
Surge current when voltage rises is constant.
In conclusion a kind of input voltage rise time control circuit provided by the invention, by panel driving unit
Interior setting voltage control unit, voltage control unit include: voltage rate of rise detecting unit, first comparator, second compare
Device, control unit and capacitor cell, voltage rate of rise detecting unit detect the voltage rate of rise of the second end of capacitor cell
And export to first comparator and the second comparator, the first comparator and the second comparator respectively rise the voltage tiltedly
Rate is compared with the second slope of the first slope of corresponding preset minimum available machine time and corresponding preset maximum available machine time
Compared with control module changes the capacitance of the capacitor cell according to comparison result, to adjust the electricity of the second end of capacitor cell
Pressure rises to the time of input voltage, and the control panel available machine time meets normal boot-strap time range, improves product quality.More than
It is described, for those of ordinary skill in the art, other can be made with technical concept according to the technique and scheme of the present invention
Various corresponding changes and modifications, and all these change and modification all should belong to the protection model of appended claims of the present invention
It encloses.
Claims (10)
1. a kind of input voltage rise time control circuit characterized by comprising machine core board (1) and the machine core board (1)
The panel driving unit (2) of electric connection, panel driving unit (2) the connection load (3)；The panel driving unit (2)
It include: the voltage control unit (21) being electrically connected with the machine core board (1)；
The voltage control unit (21) includes: voltage rate of rise detecting unit (211), first comparator (212), the second ratio
Compared with device (213), control module (214) and capacitor cell (215)；The input terminal of the voltage rate of rise detecting unit (211)
It is electrically connected the output end of machine core board (1), the output end of the voltage rate of rise detecting unit (211) is electrically connected the simultaneously
Non-inverting input terminal, the non-inverting input terminal of the second comparator (213) of one comparator (212)；The first comparator (212) it is anti-
Phase input terminal receives first slope (K1), and the output end of the first comparator (212) is electrically connected the of control module (214)
One input terminal；The inverting input terminal of second comparator (213) receives the second slope (K2), second comparator (213)
Output end be electrically connected control module (214) the second input terminal；The first end of the capacitor cell (215) is electrically connected control
The output end of molding block (214), the second end of the capacitor cell (215) are electrically connected the output end of machine core board (1)；First tiltedly
Rate (K1) is the voltage rate of rise of the second end of the capacitor cell (215) of corresponding preset minimum available machine time, the second slope
It (K2) is the voltage rate of rise of the second end of the capacitor cell (215) of corresponding preset maximum available machine time；
The output end of the machine core board (1) exports an input voltage (Vin) to panel driving unit (2)；The voltage rises oblique
Rate detecting unit (211) detect capacitor cell (215) second end the voltage rate of rise, and by the voltage rate of rise export to
The non-inverting input terminal of first comparator (212) and the second comparator (213), the first comparator (212) rise voltage oblique
Rate is compared with first slope (K1), and exports the first comparison result to control module (214)；Second comparator
(213) the voltage rate of rise and the second slope (K2) are compared, and export the second comparison result to control module (214)；
The control module (214) changes the electricity of the capacitor cell (215) according to first comparison result and the second comparison result
Capacity, so that the voltage for adjusting the second end of capacitor cell (215) rises to the time of input voltage (Vin).
2. input voltage rise time control circuit as described in claim 1, which is characterized in that when second comparison result
When for the voltage rate of rise less than the second slope (K2), the control module (214) controls the capacitor of the capacitor cell (215)
Amount reduces, so that the voltage for reducing the second end of capacitor cell (215) rises to the time of input voltage (Vin)；
When first comparison result is that the voltage rate of rise is greater than first slope (K1), control module (214) control
The capacitance of the capacitor cell (215) increases, so that the voltage for increasing the second end of capacitor cell (215) rises to input electricity
Press the time of (Vin).
3. input voltage rise time control circuit as claimed in claim 1 or 2, which is characterized in that compare when described first
As a result it is less than first slope (K1) for the voltage rate of rise, and second comparison result is that the voltage rate of rise is greater than second tiltedly
When rate (K2), the control module (214) does not change the capacitance of capacitor cell (215).
4. input voltage rise time control circuit as described in claim 1, which is characterized in that the capacitor cell (215)
Include: multiple field-effect tube (Q) and with the one-to-one multiple capacitors (C) of the multiple field-effect tube (Q)；The multiple field
The grid of effect pipe (Q) is electrically connected control module (214), source grounding, and drain electrode is electrically connected the of corresponding capacitor (C)
One end；The second end of the multiple capacitor (C) is electrically connected the output end of machine core board (1)；
Described control unit (214) passes through the conducting for controlling multiple field-effect tube (Q) respectively and cut-off changes capacitor cell (215)
Capacitance.
5. input voltage rise time control circuit as described in claim 1, which is characterized in that the panel driving unit
It (2) further include the current control unit (22) being electrically connected with the voltage control unit (21)；
The current control unit (22) includes: that photo-coupler (221), first resistor (R1), second resistance (R2), third compare
Device (222) and the 4th comparator (223)；The first pin (10) of the photo-coupler (221) is electrically connected machine core board (1)
Output end, second pin (20) are electrically connected load (3), and third pin (30) is electrically connected the first end of second resistance (R2),
4th pin (40) is electrically connected first node (A)；The second end of the second resistance (R2) accesses supply voltage (VCC)；Institute
The first end for stating first resistor (R1) is electrically connected first node (A), second end ground connection；The third comparator (222) it is same
Phase input terminal is electrically connected first node (A), and inverting input terminal receives the first comparison voltage (V1), and output end is electrically connected control
The third input terminal of module (214)；The non-inverting input terminal of 4th comparator (223) is electrically connected first node (A), reverse phase
Input terminal receives the second comparison voltage (V2), and output end is electrically connected the 4th input terminal of control module (214)；
First comparison voltage (V1) is the first pin (10) that preset minimum surge current flows into photo-coupler (221)
When, the voltage at first node (A)；Second comparison voltage (V2) is that preset maximum surge current flows into photo-coupler
(221) voltage when the first pin (10), at first node (A)；
Surge current when the voltage of the second end of capacitor cell (215) rises flows into first pin of photo-coupler (221)
(10) when, the voltage at first node (A) is compared by the third comparator (222) with the first comparison voltage (V1), and
Third comparison result is exported to control module 214；4th comparator (223) is by the voltage and second at first node (A)
Comparison voltage (V2) is compared, and exports the 4th comparison result to control module 214；The control module (214) is according to institute
It states third comparison result and the 4th comparison result changes the capacitance of the capacitor cell (215), to adjust capacitor cell
(215) surge current when voltage of second end rises.
6. input voltage rise time control circuit as claimed in claim 5, which is characterized in that the photo-coupler (221)
Including light emitting diode (D) and phototriode (VT)；The anode of the light emitting diode (D) is the of photo-coupler (221)
One pin (10), cathode are the second pin (20) of photo-coupler (221)；The transmitting extremely optocoupler of the phototriode (VT)
The third pin (30) of clutch (221), the 4th pin (40) of current collection extremely photo-coupler (221), base stage are not drawn.
7. input voltage rise time control circuit as claimed in claim 5, which is characterized in that when the third comparison result
When for the voltage at first node (A) less than the first comparison voltage (V1), the control module (214) controls the capacitor cell
(215) capacitance reduces, thus the surge current when voltage for increasing the second end of capacitor cell (215) rises；
When the 4th comparison result is greater than the second comparison voltage (V2) for the voltage at first node (A), the control mould
The capacitance that block (214) controls the capacitor cell (215) increases, to reduce the voltage of the second end of capacitor cell (215)
Surge current when rising.
8. input voltage rise time control circuit as described in claim 5 or 7, which is characterized in that when the third compares
As a result it is greater than the first comparison voltage (V1) for the voltage at first node (A), and the 4th comparison result is first node (A)
When the voltage at place is less than the second comparison voltage (V2), the control module (214) does not change the capacitor of the capacitor cell (215)
Amount.
9. input voltage rise time control circuit as described in claim 1, which is characterized in that the control module (214)
For sequence controller；
The voltage rate of rise detecting unit (211) is differentiator.
10. input voltage rise time control circuit as described in claim 1, which is characterized in that the preset minimum is opened
The machine time is 0.5ms, and the preset maximum available machine time is 10ms.
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| CN107301849B (en) * | 2017-07-19 | 2018-08-14 | 深圳市华星光电半导体显示技术有限公司 | Display driver chip and liquid crystal display device |
| CN109188306B (en) * | 2018-07-18 | 2019-11-26 | 深圳市华星光电半导体显示技术有限公司 | Detect the circuit and method of the input voltage rate of climb |
| CN109326254B (en) * | 2018-11-07 | 2020-09-08 | 深圳市华星光电技术有限公司 | Output signal control circuit and control method |
| CN110112901B (en) * | 2019-05-28 | 2024-03-12 | 苏州浪潮智能科技有限公司 | Soft start circuit applied to voltage regulating circuit and control method thereof |
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| JP2006323311A (en) * | 2005-05-20 | 2006-11-30 | Sharp Corp | Display apparatus |
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| CN101471054A (en) * | 2007-12-27 | 2009-07-01 | 东部高科股份有限公司 | LCD driver IC and method for operating the same |
| CN102354487A (en) * | 2011-02-15 | 2012-02-15 | 明基电通有限公司 | Method for controlling power supply and display device |
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| JP4059969B2 (en) * | 1997-12-26 | 2008-03-12 | 株式会社半導体エネルギー研究所 | Display device and driving method thereof |
| JP2006323311A (en) * | 2005-05-20 | 2006-11-30 | Sharp Corp | Display apparatus |
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