CN109637474A - Overcurrent protection circuit and display device - Google Patents
Overcurrent protection circuit and display device Download PDFInfo
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- CN109637474A CN109637474A CN201811558733.1A CN201811558733A CN109637474A CN 109637474 A CN109637474 A CN 109637474A CN 201811558733 A CN201811558733 A CN 201811558733A CN 109637474 A CN109637474 A CN 109637474A
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- 238000001514 detection method Methods 0.000 claims abstract description 23
- 230000005540 biological transmission Effects 0.000 claims description 8
- 230000005611 electricity Effects 0.000 claims description 7
- 230000000630 rising effect Effects 0.000 claims description 4
- 238000007689 inspection Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 5
- 239000004973 liquid crystal related substance Substances 0.000 description 3
- 239000010409 thin film Substances 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 239000010408 film Substances 0.000 description 2
- 239000002096 quantum dot Substances 0.000 description 2
- 238000007688 edging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
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Classifications
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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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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/20—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for electronic equipment
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of Voltage And Current In General (AREA)
Abstract
The application relates to an overcurrent protection circuit, which comprises a switch module, a voltage division module, a detection module and a control module; the switch module is connected with a load; the voltage division module is connected between the power management module and the switch module and used for dividing voltage to reduce the voltage of the load when the current of the load is increased; the detection module is connected with the switch module and used for detecting the voltage of the load through the switch module; the control module is respectively connected with the detection module and the switch module and used for controlling the switch module to be cut off when the voltage of the load is smaller than a preset voltage so as to disconnect the power management module from the load.
Description
Technical field
This application involves field of display technology, in particular to a kind of current foldback circuit and display device.
Background technique
(Thin Film Transistor Liquid Crystal Display, tft liquid crystal are aobvious by TFT-LCD
Show device) it is one of the principal item that current flat panel is shown, have become modern IT, display platform important in video product.
The main driving principle of TFT-LCD is: R/G/B compressed signal and control signal are passed through the company on wire rod and pcb board by system board
It connects device (connector) to be connected, data are integrated by the TCON (Timing Controller, sequence controller) on pcb board
After circuit (IC) processing, through pcb board, pass through S-COF (Source-Chip on Film) and G-COF (Gate-Chip on
Film it) is connect with viewing area, so that LCD obtains required signal；The motherboard power supply of system board is transmitted to by wire rod
Power management module on pcb board is transmitted to LCD through pcb board after the processing of power management module, to drive LCD.
Power management module is transmitted to the power supply of LCD, it is possible that LCD shorted to earth etc. is abnormal, causes LCD electric current different
Often increase, power management module is caused to damage.
Summary of the invention
Based on this, it is necessary to the power supply of LCD is transmitted to for power management module, it is possible that LCD shorted to earth etc.
It is abnormal, the problem of causing LCD current anomaly to increase, power management module is caused to damage, provide a kind of current foldback circuit and aobvious
Showing device.
A kind of current foldback circuit, the current foldback circuit include:
Switch module is connected with load；
Division module is connected between power management module and the switch module, is increased for the electric current when the load
When big, divide so that the voltage of the load reduces；
Detection module is connect with the switch module, for detecting the voltage of the load by the switch module；And
Control module is connect with the detection module and the switch module respectively, small for the voltage when the load
When predeterminated voltage, the switch module cut-off is controlled, to disconnect the connection of the power management module Yu the load.
The control module is also used to the voltage when the load more than or equal to described pre- in one of the embodiments,
If when voltage, the switch module conducting is controlled, to establish the connection of the power management module Yu the load.
The detection module includes: in one of the embodiments,
Operational amplifier, the reverse input end of the operational amplifier are connect with the switch module, the operation amplifier
The output end of device is connect with the control module；
First resistor, the first end of the first resistor are connect with the noninverting input of the operational amplifier, and described
The second end of one resistance is connect with the power management module；And
Second resistance, the first end of the second resistance are connect with the first end of the first resistor, the second resistance
Second end ground connection.
The control module includes: in one of the embodiments,
First control unit is connect with the output end of the operational amplifier and the switch module respectively, for working as institute
When stating the voltage of load less than predeterminated voltage, transmission high level to the switch module, to control the switch module cut-off；And
Second control unit is connect with the switch module, is greater than or equal to default electricity for the voltage when the load
When pressure, transmission low level to the switch module, to control the switch module conducting.
The first control unit includes d type flip flop in one of the embodiments, the d type flip flop include first end,
Second end and third end；The first end of the d type flip flop is connect with the output end of the operational amplifier, the d type flip flop
Second end receives high level signal, and the third end of the d type flip flop is connect with the switch module；The third of the d type flip flop
When the rising edge for holding the output end for receiving the operational amplifier when the first end of the d type flip flop to transmit, institute is received
State the high level that the second end of d type flip flop is assigned to.
Second control unit includes 3rd resistor in one of the embodiments,；The first end of the 3rd resistor
It is connect with the switch module, the second end ground connection of the 3rd resistor.
The division module includes the 4th resistance, the first end of the 4th resistance and institute in one of the embodiments,
Power management module connection is stated, the second end of the 4th resistance is connect with the switch module.
The switch module includes electronic switch in one of the embodiments, the first end of the electronic switch and institute
The second end connection of the 4th resistance is stated, the second end of the electronic switch and the load connect, the third of the electronic switch
End is connect with the first end at the third end of the d type flip flop and the 3rd resistor respectively.
A kind of current foldback circuit, the current foldback circuit include:
Switch module is connected with load；
Division module is connected between power management module and the switch module, is increased for the electric current when the load
When big, divide so that the voltage of the load reduces；
Detection module is connect with the switch module, for detecting the voltage of the load by the switch module；Institute
Stating detection module includes operational amplifier, first resistor and second resistance；The reverse input end of the operational amplifier with it is described
Switch module connection, the output end of the operational amplifier are connect with the control module；The first end of the first resistor with
The noninverting input of the operational amplifier connects, and the second end of the first resistor is connect with the power management module；Institute
The first end for stating second resistance is connect with the first end of the first resistor, the second end ground connection of the second resistance；And
Control module is connect with the detection module and the switch module respectively, small for the voltage when the load
When predeterminated voltage, the switch module cut-off is controlled, to disconnect the connection of the power management module Yu the load；It is described
Control module is also used to when the voltage of the load is greater than or equal to the predeterminated voltage, controls the switch module conducting,
To establish the connection of the power management module Yu the load.
A kind of display device, which is characterized in that the display device includes load, drive module, printed circuit board, power supply
Management module and above-mentioned current foldback circuit；The current foldback circuit and the power management module are all set in the print
Printed circuit board；The power management module is connect with motherboard power supply；The power management module be used for the motherboard power supply into
Row handles and treated motherboard power supply by the current foldback circuit is supplied to load, the display picture loaded with driving
Face.
Above-mentioned current foldback circuit is increased by the voltage of detection module detection load when short circuit current occurs for load
When, by division module the voltage of load is reduced, when the voltage of load is less than predeterminated voltage, control module control switch
Module cut-off, to disconnect the connection of power management module and load, avoids power management module from damaging because electric current is excessive.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the display device of one embodiment；
Fig. 2 is the functional block diagram of the current foldback circuit of one embodiment；
Fig. 3 is the power management module of one embodiment and the circuit diagram that load is connect with current foldback circuit respectively.
Specific embodiment
The application in order to facilitate understanding is described more fully the application below with reference to relevant drawings.In attached drawing
Give the better embodiment of the application.But the application can realize in many different forms, however it is not limited to herein
Described embodiment.On the contrary, the purpose of providing these embodiments is that making to understand more disclosure of this application
Add thorough and comprehensive.
It should be noted that it can directly on the other element when element is referred to as " being fixed on " another element
Or there may also be elements placed in the middle.When an element is considered as " connection " another element, it, which can be, is directly connected to
To another element or it may be simultaneously present centering elements.Term as used herein " vertical ", " horizontal ", " left side ",
" right side " and similar statement for illustrative purposes only, are not meant to be the only embodiment.
Unless otherwise defined, all technical and scientific terms used herein and the technical field for belonging to the application
The normally understood meaning of technical staff is identical.The term used in the description of the present application is intended merely to description tool herein
The purpose of the embodiment of body, it is not intended that in limitation the application.
Referring to Fig. 1, Fig. 1 is the structural schematic diagram of the display device 10 in an embodiment, which be can wrap
Include display panel 100, drive module 200 and printed circuit board 300.
Display panel 100 includes display area 110 and non-display area 120, and display area 110 that is to say image information
One piece of region of display, is referred to as viewing area (active area).Multiple data lines 111 are provided in display area 110
With a plurality of grid line 112.Multiple data lines 111 extend in a first direction, and arrange in a second direction.Grid line 112 is also referred to as scan line,
A plurality of grid line 112 extends in a second direction, arranges along first direction.It is appreciated that the extension of grid line 112 and data line 111, row
Column direction is opposite, that is, the extending direction of data line 111 is the orientation of grid line 112, the arrangement side of data line 111
To the extending direction for grid line 112.First direction, second direction are orthogonal simultaneously, please refer to Fig. 1, first direction can be managed
Solution is the extending direction of the Y-axis in vertical direction, that is, two-dimensional coordinate, and second direction can be understood as horizontal direction, also
It is the extending direction of the X-axis in two-dimensional coordinate.Multiple pixel units 113 being arranged in array are additionally provided in display area 110,
Pixel unit 113 is electrically connected with data line 111 and grid line 112 respectively.
Non-display area 120 is often referred to the region that no image is shown, the partial region be mainly used for some routes and
Operative sensor is pressed together on this region.In the application, display panel may be, for example, TFT-LCD (Thin Film
Transistor Liquid Crystal Displayer, Thin Film Transistor-LCD) display panel, OLED
(Organic Light-Emitting Diode, Organic Light Emitting Diode) display panel, QLED (Quantum Dot Light
Emitting Diodes, light emitting diode with quantum dots) display panel, curved face display panel or other display panels.
Drive module 200 may include sequence controller 210, source drive unit 220 and drive element of the grid 230.Source
Pole driving unit 220 is electrically connected with data line 111, and drive element of the grid 230 is electrically connected with grid line 112.Sequence controller 210 is used
In transmission signal to source drive unit 220 and drive element of the grid 230.Specifically, sequence controller 210 be mainly used for will be
R (Red, red)/G (Green, green)/B (Blue, blue) compressed signal and control signal that mainboard of uniting transmits are handled,
It is that data line 111 provides data-signal and control signal and is by drive element of the grid 230 by source drive unit 220
Grid line 112 provides driving signal and control signal, so that pixel unit 113 is able to carry out normal display.
Printed circuit board 300, abbreviation PCB (Printed Circuit Board).Sequence controller 210 is set to printing
On circuit board 300.Printed circuit board 300 is important electronic component, is the supporter of electronic component, is electronic component electricity
The carrier of gas connection.
Referring to Fig. 2, for the functional block diagram of the current foldback circuit in an embodiment.The current foldback circuit includes opening
Close module 20, division module 30, detection module 40 and control module 50.Switch module 20 is connect with load 400.Division module 30
It is connected between power management module 250 and the switch module 20, for dividing when the electric current of the load 400 increases
So that the voltage of the load 400 reduces.Detection module 40 is connect with the switch module 20, for passing through the switch module
The voltage of the 20 detections load 400.Control module 50 is connect with the detection module 40 and the switch module 20 respectively, is used
In when the voltage of the load 400 is less than predeterminated voltage, controls the switch module 20 and end, to disconnect the power management
The connection of module 250 and the load 400.
It should be noted that the predeterminated voltage is the reference voltage according to actual needs setting.
In the present embodiment, the load 400 is display panel 100.
Drive module 200 can also include the current foldback circuit 240 and power management module 250.The overcurrent is protected
Protection circuit 240 and the power management module 250 are all set in the printed circuit board 300.The power management module 250 divides
It is not connect with the motherboard power supply of system board 500 and the current foldback circuit 240.The power management module 250 leads to respectively
It crosses source drive unit 220 and drive element of the grid 230 is connect with display panel 100.The power management module 250 for pair
The motherboard power supply 500 handle and will treated motherboard power supply 500 be supplied to by the current foldback circuit 240 it is negative
400 are carried, with 400 display picture of driving load.
Wherein, the power management module 250 be transmitted to the current foldback circuit 240 voltage it is constant.
Further, the control module 50 is also used to be greater than or equal to the default electricity when the voltage of the load 400
It when pressure, controls the switch module 20 and is connected, to establish the connection of the power management module 250 with the load 400.Negative
When carrying 400 without short circuit, the switch module 20 establishes the connection of power management module 250 and load 400, so that power management
The motherboard power supply that module 250 is transmitted can drive load 400；When loading 400 short circuit, the switch module 20 disconnects power supply pipe
The connection for managing module 250 and load 400 avoids the power management module 250 from being damaged because the electric current for loading 400 is excessive
It is bad.
Referring to Fig. 3, in one embodiment, the detection module 40 includes operational amplifier U1, first resistor R1 and the
Two resistance R2.The reverse input end of the operational amplifier U1 is connect with the switch module 20, the operational amplifier U1's
Output end is connect with the control module 50.The input in the same direction of the first end of the first resistor R1 and the operational amplifier U1
End connection, the second end of the first resistor R1 are connect with the power management module 250.The first end of the second resistance R2
It is connect with the first end of the first resistor R1, the second end ground connection of the second resistance R2.In the present embodiment, the operation
The reference voltage of the noninverting input of amplifier U1 is by the output voltage of the power management module 250 through the first resistor R1
And the partial pressure of the second resistance R2 provides.The operational amplifier U1 is using inexpensive, micro energy lose benchmark with voltage
Chip saves power consumption to reduce costs.
In other embodiments, the reference voltage of the noninverting input of the operational amplifier U1 can be mentioned by other power supplys
For.
In one embodiment, the control module 50 includes first control unit 51 and the second control unit 52.First control
Unit 51 processed is connect with the output end of the operational amplifier U1 and the switch module 20 respectively, for when the load 400
Voltage when being less than predeterminated voltage, transmission high level is ended with controlling the switch module 20 to the switch module 20.Second
Control unit 52 is connect with the switch module 20, for passing when the voltage of the load 400 is greater than or equal to predeterminated voltage
Defeated low level is connected to the switch module 20 with controlling the switch module 20.It is controlled by first control unit 51 described
The cut-off of switch module 20 and the conducting that the switch module 20 is controlled by the second control unit 52, so that the switch module
20 conducting and cut-off access independent control, avoid the occurrence of the power supply that switching off load 400 is missed caused by accidentally controlling.It is described
The voltage that the voltage of load 400 is less than predeterminated voltage, that is, operational amplifier U1 reverse input end is less than the operation amplifier
The output end of the voltage of the noninverting input of device U1, the operational amplifier U1 exports high level.The voltage of the load 400 is small
It is same more than or equal to the operational amplifier U1 in the voltage of predeterminated voltage, that is, operational amplifier U1 reverse input end
To the voltage of input terminal, the output end of the operational amplifier U1 exports low level.
In one embodiment, the first control unit 51 include d type flip flop U2, the d type flip flop U2 include first end,
Second end and third end.The first end of the d type flip flop U2 is connect with the output end of the operational amplifier U1, the D triggering
The second end of device U2 receives high level signal H, and the third end of the d type flip flop U2 is connect with the switch module 20.The D touching
The third end of hair device U2 is used to receive the output end transmission of the operational amplifier U1 when the first end of the d type flip flop U2
When rising edge, the high level that the second end of the d type flip flop U2 is assigned to is received.Using the d type flip flop U2, the d type flip flop
The edging trigger characteristic of U2 can prevent the interference in signals transmission by extraneous signal, guarantee the stability of signal transmission.
In one embodiment, second control unit 52 includes 3rd resistor R3.The first end of the 3rd resistor R3
It is connect with the switch module 20, the second end ground connection of the 3rd resistor R3.The 3rd resistor R3 makes the d type flip flop
When the three-polar output high level of U2, high level is maintained.
In one embodiment, the division module 30 includes the 4th resistance R4, the first end of the 4th resistance R4 and institute
The connection of power management module 250 is stated, the second end of the 4th resistance R4 is connect with the switch module 20.4th resistance
R4 realize can the division module 30 partial pressure effect.
Further, the switch module 20 includes electronic switch Q1, the first end of the electronic switch Q1 and described the
The second end of four resistance R4 connects, and the second end of the electronic switch Q1 is connect with the load 400, the electronic switch Q1's
Third end is connect with the first end at the third end of the d type flip flop U2 and the 3rd resistor R3 respectively.
In the present embodiment, the electronic switch Q1 is PMOS tube or PNP type triode, the of the electronic switch Q1
One end, second end and third end respectively correspond source electrode, drain electrode and the grid of PMOS tube or emitter, the current collection of PNP type triode
Pole and base stage.In other embodiments, the electronic switch Q1 can be other switches with identity function.
For the electronic switch Q1 using metal-oxide-semiconductor field effect transistor or triode, loss is small, and response is fast, reliable and stable.
The working principle of the current foldback circuit is illustrated below.
The output voltage of the power management module 250 is VAA, and the voltage of the load 400 is VAA_O, the operation
The voltage of the noninverting input of amplifier U1 is V1.The predeterminated voltage is the electricity of the noninverting input of the operational amplifier U1
Press V1, wherein V1=VAA*r2/ (r1+r2), r1 are the resistance value of first resistor R1, the resistance value of r2 second resistance R2.
When there is no when shorted to earth, i.e., the voltage VAA_O of the described load 400 is greater than or equal to described pre- for load 400
If when voltage V1, the output end of the operational amplifier U1 exports low level, and the d type flip flop U2 does not work, the PMOS tube
Grounded-grid, and then the PMOS tube be connected, power management module 250 by the current foldback circuit be the load
400 power supplies；When load 400 occur shorted to earth when, it is described load 400 electric current increase, the power management module 250 it is defeated
Voltage VAA is constant out, since the partial pressure of the 4th resistance R4 increases, the voltage VAA_O of the load 400 reduces, when
When the voltage VAA_O of the load 400 is less than the predeterminated voltage V1, the high electricity of output end output of the operational amplifier U1
Flat, the first end of the d type flip flop U2 receives rising edge, and the high level of second end is assigned to third end by the d type flip flop U2,
The PMOS tube cut-off avoids power management mould to disconnect the connection of the power management module 250 with the load 400
Block 250 is damaged because electric current is excessive.
Above-mentioned current foldback circuit is increased by the voltage of detection module detection load when short circuit current occurs for load
When, by division module the voltage of load is reduced, when the voltage of load is less than predeterminated voltage, control module control switch
Module cut-off, to disconnect the connection of power management module and load, avoids power management module from damaging because electric current is excessive.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention
Range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (10)
1. a kind of current foldback circuit, which is characterized in that the current foldback circuit includes:
Switch module is connected with load；
Division module is connected between power management module and the switch module, for when the load electric current increase when,
Partial pressure is so that the voltage of the load reduces；
Detection module is connect with the switch module, for detecting the voltage of the load by the switch module；And
Control module is connect with the detection module and the switch module respectively, is less than for the voltage when the load pre-
If when voltage, the switch module cut-off is controlled, to disconnect the connection of the power management module Yu the load.
2. current foldback circuit according to claim 1, which is characterized in that the control module is also used to when the load
Voltage when being greater than or equal to the predeterminated voltage, control switch module conducting, with establish the power management module with
The connection of the load.
3. current foldback circuit according to claim 1, which is characterized in that the detection module includes:
Operational amplifier, the reverse input end of the operational amplifier are connect with the switch module, the operational amplifier
Output end is connect with the control module；
First resistor, the first end of the first resistor are connect with the noninverting input of the operational amplifier, first electricity
The second end of resistance is connect with the power management module；And
Second resistance, the first end of the second resistance are connect with the first end of the first resistor, and the of the second resistance
Two ends ground connection.
4. current foldback circuit according to claim 3, which is characterized in that the control module includes:
First control unit is connect with the output end of the operational amplifier and the switch module respectively, for when described negative
When the voltage of load is less than predeterminated voltage, transmission high level to the switch module, to control the switch module cut-off；And
Second control unit is connect with the switch module, for when the voltage of the load be greater than or equal to predeterminated voltage when,
Low level is transmitted to the switch module, to control the switch module conducting.
5. current foldback circuit according to claim 4, which is characterized in that the first control unit includes d type flip flop,
The d type flip flop includes first end, second end and third end；The first end of the d type flip flop is defeated with the operational amplifier
Outlet connection, the second end of the d type flip flop receive high level signal, the third end of the d type flip flop and the switch module
Connection；The third end of the d type flip flop is used to receive the output end of the operational amplifier when the first end of the d type flip flop
When the rising edge of transmission, the high level that the second end of the d type flip flop is assigned to is received.
6. current foldback circuit according to claim 5, which is characterized in that second control unit includes third electricity
Resistance；The first end of the 3rd resistor is connect with the switch module, the second end ground connection of the 3rd resistor.
7. current foldback circuit according to claim 6, which is characterized in that the division module includes the 4th resistance, institute
The first end for stating the 4th resistance is connect with the power management module, and the second end of the 4th resistance and the switch module connect
It connects.
8. current foldback circuit according to claim 7, which is characterized in that the switch module includes electronic switch, institute
The first end for stating electronic switch is connect with the second end of the 4th resistance, and the second end of the electronic switch and the load connect
It connects, the third end of the electronic switch is connect with the first end at the third end of the d type flip flop and the 3rd resistor respectively.
9. a kind of current foldback circuit, which is characterized in that the current foldback circuit includes:
Switch module is connected with load；
Division module is connected between power management module and the switch module, for when the load electric current increase when,
Partial pressure is so that the voltage of the load reduces；
Detection module is connect with the switch module, for detecting the voltage of the load by the switch module；The inspection
Surveying module includes operational amplifier, first resistor and second resistance；The reverse input end of the operational amplifier and the switch
Module connection, the output end of the operational amplifier are connect with the control module；The first end of the first resistor with it is described
The noninverting input of operational amplifier connects, and the second end of the first resistor is connect with the power management module；Described
The first end of two resistance is connect with the first end of the first resistor, the second end ground connection of the second resistance；And
Control module is connect with the detection module and the switch module respectively, is less than for the voltage when the load pre-
If when voltage, the switch module cut-off is controlled, to disconnect the connection of the power management module Yu the load；The control
Module is also used to when the voltage of the load is greater than or equal to the predeterminated voltage, the switch module conducting is controlled, to build
Stand the connection of the power management module Yu the load.
10. a kind of display device, which is characterized in that the display device includes load, drive module, printed circuit board, power supply
Current foldback circuit described in any one of management module and claim 1-9；The current foldback circuit and the power supply
Management module is all set in the printed circuit board；The power management module is connect with motherboard power supply；The power management mould
Block be used to that the motherboard power supply to be carried out to handle and will treated motherboard power supply be supplied to by the current foldback circuit it is negative
It carries, to drive the load to show picture.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811558733.1A CN109637474A (en) | 2018-12-19 | 2018-12-19 | Overcurrent protection circuit and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811558733.1A CN109637474A (en) | 2018-12-19 | 2018-12-19 | Overcurrent protection circuit and display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109637474A true CN109637474A (en) | 2019-04-16 |
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| CN201811558733.1A Pending CN109637474A (en) | 2018-12-19 | 2018-12-19 | Overcurrent protection circuit and display device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110794333A (en) * | 2019-11-25 | 2020-02-14 | 伯恩光学(惠州)有限公司 | LCD short circuit detection circuit and detection method |
| WO2020248856A1 (en) * | 2019-06-10 | 2020-12-17 | 惠科股份有限公司 | Overcurrent protection circuit, method for driving overcurrent protection circuit, and display device |
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| WO2020248856A1 (en) * | 2019-06-10 | 2020-12-17 | 惠科股份有限公司 | Overcurrent protection circuit, method for driving overcurrent protection circuit, and display device |
| CN110794333A (en) * | 2019-11-25 | 2020-02-14 | 伯恩光学(惠州)有限公司 | LCD short circuit detection circuit and detection method |
| CN110794333B (en) * | 2019-11-25 | 2022-03-18 | 伯恩光学(惠州)有限公司 | LCD short circuit detection circuit and detection method |
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Application publication date: 20190416 |