CN106602532A - Current limiting circuit, driving method thereof, PMIC protection system and display device protection system - Google Patents
Current limiting circuit, driving method thereof, PMIC protection system and display device protection system Download PDFInfo
- Publication number
- CN106602532A CN106602532A CN201710080753.1A CN201710080753A CN106602532A CN 106602532 A CN106602532 A CN 106602532A CN 201710080753 A CN201710080753 A CN 201710080753A CN 106602532 A CN106602532 A CN 106602532A
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- current
- module
- voltage
- limiting circuit
- voltage end
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
-
- 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
- G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
-
- 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
- G09G2330/12—Test circuits or failure detection circuits included in a display system, as permanent part thereof
Abstract
The present invention provides a current limiting circuit, a driving method thereof, a PMIC protection system and a display device protection system, belonging to the technical field of display. A problem that existing debugging structure can not be normally started due to too large surge current in switch-on can be solved. The current limiting circuit comprises a current limiting module, a switch module and a charging delay module. The switch module is connected to a first voltage end, the charging delay module and a current output end. The current limiting module is connected to the first voltage end and a current output end. The charging delay module is connected to the first voltage end and a second voltage end. The current limiting module is used for dividing the voltage inputted by the first voltage end in a power-on stage so as to limit the magnitude of current outputted by the current output end. The charging delay module is used for providing starting voltage for the switch module after a circuit is switched on for a certain time so as to allow the current limiting module to be short-circuited and outputting corresponding current through the current output end.
Description
Technical field
The invention belongs to display technology field, and in particular to a kind of current-limiting circuit and its driving method, PMIC protection systems
With display apparatus protecting system.
Background technology
Manufacturer to before users' sale, needs the performance to display device to carry out research and development tune by display device
Examination, the debugging structure for often using is voltage input end and power management integrated circuit (Power Management IC, abbreviation
PMIC input connection), the output end of PMIC is connected with display device.
In the research and development debugging stage of display device, surge current can be produced in debug circuit, wherein, surge current is referred to
Power on moment, the peak point current of power-supply device is flowed into, the current value of the surge current is much larger than the normal current of stable state
Current value.In control source, surge current is produced immediately and the current value of surge current gradually increases, when the electricity of surge current
Flow valuve is increased to and start after peak value reduction, finally reaches the current value of normal current.
The surge current produced in the research and development debugging stage, it sometimes appear that (i.e. voltage input end is input into electricity because of upper electricity
Pressure) when the surge current that produces it is excessive, cause PMIC to burn or the surge current be detected as high current so as to start short-circuit guarantor
The phenomenon of shield, and then debugging structure is normally started.But for this phenomenon, there is no effective measures to be solved at present.
The content of the invention
It is contemplated that at least solving one of technical problem present in prior art, it is proposed that one kind can reduce electricity
When surge current to avoid surge current caused by debug the current-limiting circuit that cannot normally start of structure and its driving method,
PMIC protection systems and display apparatus protecting system.
The technical scheme that solution present invention problem is adopted is a kind of current-limiting circuit, including：Current limliting module, switching molding
Block and charging time delay module；
The switch module connection first voltage end, charging time delay module and current output terminal；
The current limliting module connects the first voltage end and the current output terminal；
The charging time delay module connects the first voltage end and second voltage end；
The current limliting module, for carrying out partial pressure to the voltage that the first voltage end is input in power up phase, to limit
Make the size of current that the current output terminal is exported；
The charging time delay module, for after the circuit turn-on certain hour, for the switch module unlatching being provided
Voltage, so that the current limliting module short circuit, and corresponding electric current is exported by the current output terminal.
Wherein, the switch module includes switching tube, and the first pole of the switching tube is connected with the first voltage end, institute
The second pole for stating switching tube is connected with the current output terminal, and the control pole of the switching tube connects with the charging time delay module
Connect.
Wherein, the current limliting module includes first resistor, and the first end of the first resistor is connected with first voltage end, institute
The second end for stating first resistor is connected with current output terminal.
Wherein, the charging time delay module includes electric capacity and second resistance, the first end of the second resistance and described the
One voltage end connects, and the second end of the second resistance is connected with the first end of the electric capacity, the second end of the electric capacity and institute
State the connection of second voltage end.
Used as another technical scheme, the present invention also provides a kind of driving method of current-limiting circuit, including：
Power up phase：The first supply voltage is input into for first voltage end, is that charging time delay module charges, switch module is closed
Close, partial pressure is carried out to the first supply voltage that the first voltage end is input into by current limliting module, to limit current output terminal institute
The size of current of output；
The stage of electric current output；Cut-in voltage is provided for switch module by the charging time delay module, switch module is beaten
Open, current limliting module short circuit, the current output terminal exports corresponding electric current.
Used as another technical scheme, the present invention also provides a kind of PMIC protection systems, including described in above-mentioned any one
Current-limiting circuit.
Wherein, the PMIC protection systems also include power management integrated circuit；
The power management integrated circuit is electrically connected with the current output terminal of the current-limiting circuit.
Used as another technical scheme, the present invention also provides a kind of display apparatus protecting system, above-mentioned including what is be sequentially connected
PMIC protection systems, the second current-limiting circuit and display device described in any one, the structure of second current-limiting circuit with it is upper
The structure for stating current-limiting circuit described in any one is identical.
Wherein, the output end of the power management integrated circuit in the PMIC protection systems is second current-limiting circuit
First voltage end, the current output terminal of second current-limiting circuit is electrically connected with the display device.
In the current-limiting circuit and its driving method, PMIC protection systems and display apparatus protecting system of the present invention, the current limliting
Circuit includes：Current limliting module, switch module and charging time delay module, switch module connection first voltage end, charging time delay module
And current output terminal, current limliting module connection first voltage end and current output terminal, charging time delay module connection first voltage end and
Second voltage end, wherein, the voltage that current limliting module can be input in power up phase to first voltage end carries out partial pressure, to limit
The size of the electric current that current output terminal is exported, then after the current-limiting circuit conducting certain hour, charging time delay module is to open
Close module and cut-in voltage is provided, so that current limliting module short circuit, and corresponding electric current is exported by current output terminal, electric current now
For normal current, to avoid surge current caused by debug the problem that structure cannot normally start.
Description of the drawings
Fig. 1 is the structural representation of the current-limiting circuit of embodiments of the invention 1；
Fig. 2 is the concrete structure schematic diagram of the current-limiting circuit of embodiments of the invention 1；
Fig. 3 is the schematic flow sheet of the driving method of the current-limiting circuit of embodiments of the invention 2；
Fig. 4 is the structural representation of the PMIC protection systems of embodiments of the invention 3；
Fig. 5 is the structural representation of the display apparatus protecting system of embodiments of the invention 4；
Wherein, reference is：1st, current limliting module；2nd, switch module；3rd, charging time delay module；VCC, first voltage end；
OUT, current output terminal；VSS, second voltage end；T, switching tube；Rs, first resistor；Ct, electric capacity；Rt, second resistance.
Specific embodiment
To make those skilled in the art more fully understand technical scheme, below in conjunction with the accompanying drawings and specific embodiment party
Formula is described in further detail to the present invention.
Embodiment 1：
Fig. 1 and Fig. 2 is refer to, the present embodiment provides a kind of current-limiting circuit, including：Current limliting module 1, switch module 2 and fill
Electric time delay module 3；Switch module 2 is connected respectively with first voltage end VCC, charging time delay module 3 and current output terminal OUT；Limit
Flow module 1 is connected with first voltage end VCC and current output terminal OUT；Charging time delay module 3 respectively with first voltage end VCC and
Second voltage end VSS is connected；Current limliting module 1 is used to be carried out the voltage that first voltage end VCC is input into point in power up phase
Pressure, to limit the size of current that current output terminal OUT is exported；Charging time delay module 3 is used for after circuit turn-on certain hour,
Cut-in voltage is provided for switch module 2, so that current limliting module 1 is short-circuit, and corresponding electric current is exported by current output terminal OUT.
It should be noted that in the present embodiment, second voltage end VSS is electronegative potential compared to first voltage end VCC, the
Two voltage end VSS can also be grounded, and will not be described here.
Due to arranging current limiting module 1 in the current-limiting circuit in the present embodiment, the current limliting module 1 in power up phase, namely
In the current limliting stage, partial pressure is carried out to the voltage that first voltage end VCC is input into, so that the electric current for being exported of current output terminal OUT
Less than the peak value of surge current.Meanwhile, after some period of time, charging time delay module 3 is that switch module 2 provides unlatching electricity
Pressure, opens switch module 2, so that current limliting module 1 is shorted, and then ensures that normal current is exported from current output terminal OUT.
Fig. 2 is refer to, wherein, switch module 2 includes switch transistor T, the first pole of switch transistor T and one end of current limliting module 1
Connection, the second pole of switch transistor T is connected with the other end of current limliting module 1, and control pole and the charging time delay module 3 of switch transistor T connect
Connect.
In the present embodiment, switch transistor T is N-type transistor, and the source electrode of the first extremely N-type transistor, the second extremely N-type is brilliant
The drain electrode of body pipe, the grid of control extremely N-type transistor, during grid input high level, source-drain electrode conducting.Certainly, switch transistor T
Type is not limited thereto, it would however also be possible to employ P-type transistor, and its principle with N-type transistor is conversely, will not be described here.
Wherein, current limliting module 1 includes first resistor Rs, and the first end of first resistor Rs is connected with first voltage end VCC, the
Second end of one resistance Rs is connected with current output terminal OUT.
It should be noted that the resistance of first resistor Rs is to need to precalculate out, for example, according to first voltage end
Voltage and the current value of normal current that VCC is input into, calculate the resistance of first resistor Rs.Certainly, in the present embodiment, as long as
Arrange current limiting module 1 to be capable of achieving that the voltage of first voltage end VCC inputs is carried out partial pressure to reduce the electric current of surge current
The purpose of value, but the electric current of the voltage that is only input into for first voltage end VCC when the resistance of first resistor Rs and normal current
During the ratio of value, can just make the electric current that current output terminal OUT is exported in power up phase equal with normal current；Meanwhile, also need
The time range of surge current appearance is obtained, wherein, the time range that surge current occurs is prolonged with charging time delay module 3 is needed
When switch module 2 open time it is corresponding.Because the acquisition methods of the time range of the resistance and surge current appearance of Rs can
Using prior art, will not be described here.
Wherein, charging time delay module 3 includes electric capacity Ct and second resistance Rt, the first end and first voltage of second resistance Rt
End VCC connections, the second end of second resistance Rt is connected with the first end of electric capacity Ct, the second end and the second voltage end of electric capacity Ct
VSS connects.
It should be noted that the time that the voltage of the resistance of second resistance Rt and electric capacity Ct can occur according to surge current
Scope is calculated, and be will not be described here.
The specific current limliting principle of current-limiting circuit of the present embodiment is：
Power up phase, namely current limliting stage, first voltage end VCC input voltages, second resistance Rt and electric capacity Ct constitute RC
Delay circuit, so that can not immediately turn in powered on moment switch transistor T；Meanwhile, first resistor Rs and RC delay circuits are to
One voltage end VCC input voltages carry out partial pressure, to limit the size of the electric current that current output terminal OUT is exported, so that this
When the electric current that exported less than the surge current that existing debug circuit is exported peak value.
Current output period, to electric capacity Ct charging certain hours, (i.e. surge current drops the voltage of first voltage end VCC inputs
As little as time of normal current) after, and the threshold voltage (cut-in voltage) of switch transistor T is reached, switch transistor T is opened, now, first
Resistance Rs is shorted, and circuit enters normal operating conditions, i.e., electric current now is normal current.
The current-limiting circuit of the present embodiment, including：Current limliting module 1, switch module 2 and charging time delay module 3；Switch module 2
Connection first voltage end VCC, charging time delay module 3 and current output terminal OUT, the connection first voltage end VCC of current limliting module 1 and electricity
Stream output end OUT, the connection first voltage end VCC and second voltage end VSS of charging time delay module 3, wherein, current limliting module 1 can
Partial pressure is carried out to the voltage that first voltage end VCC is input in power up phase, to limit the electric current that current output terminal OUT is exported
(i.e. surge current) size, then after the current-limiting circuit conducting certain hour, charging time delay module 3 is provided for switch module 2
Cut-in voltage, so that current limliting module 1 is short-circuit, and exports corresponding electric current by current output terminal OUT, electric current now is normal
Electric current, to avoid surge current caused by debug the problem that cannot normally start of structure；Simultaneously as the structure of the current-limiting circuit
Simply, therefore, the low cost of the current-limiting circuit, usability is strong.
Embodiment 2：
Fig. 3 is refer to, the present embodiment provides a kind of driving method of current-limiting circuit, for driving the current limliting electricity of embodiment 1
Road, the driving method includes：
Power up phase：The first supply voltage is input into for first voltage end, is that charging time delay module charges, switch module is closed
Close, partial pressure is carried out to the first supply voltage that first voltage end is input into by current limliting module, exported with limiting current output terminal
Size of current.
The stage of electric current output；Cut-in voltage is provided for switch module by charging time delay module, switch module is opened, limit
Flow module short circuit, current output terminal exports corresponding electric current.
The driving method of the current-limiting circuit of the present embodiment, for driving the current-limiting circuit of embodiment 1, detailed description can refer to
The current-limiting circuit of embodiment 1, will not be described here.
The driving method of the current-limiting circuit of the present embodiment, current limliting module can be input in power up phase to first voltage end
Voltage carry out partial pressure, to limit electric current (i.e. surge current) size that current output terminal is exported, then in the current-limiting circuit
After conducting certain hour, charging time delay module provides cut-in voltage for switch module, so that current limliting module short circuit, and by electric current
Output end exports corresponding electric current, and electric current now is normal current, to avoid surge current caused by debug structure cannot be just
The problem for often starting.
Embodiment 3：
Fig. 4 is refer to, the present embodiment provides a kind of PMIC protection systems, including the current-limiting circuit of embodiment 1.
Wherein, PMIC protection systems also include power management integrated circuit (i.e. PMIC)；Power management integrated circuit and limit
The current output terminal electrical connection of current circuit.
That is, the normal current exported from current-limiting circuit is directly entered in PMIC, because current-limiting circuit can keep away
Exempt from surge current, export normal current, cause therefore, it is possible to avoid PMIC from being damaged or be detected as high current by surge current
There is the phenomenon for starting short-circuit protection.
The PMIC protection systems of the present embodiment, including the current-limiting circuit of embodiment 1, by current-limiting circuit surge can be avoided
Circuit, in being normal current input PMIC, so as to protect to PMIC, it is to avoid PMIC is damaged or be detected as by surge current
High current causes the phenomenon for occurring starting short-circuit protection.
Embodiment 4：
Fig. 5 is refer to, a kind of display apparatus protecting system is present embodiments provided, including the embodiment 3 being sequentially connected
PMIC protection systems, the second current-limiting circuit and display device, the structure of the second current-limiting circuit and the structure of the current-limiting circuit of embodiment 1
It is identical.
It should be noted that the structure of the second current-limiting circuit is identical with the structure of the current-limiting circuit in embodiment 1, but in figure
Structure label in 5 is different, merely to making a distinction, will not be described here.
Wherein, the output end of the power management integrated circuit in PMIC protection systems is the first voltage of the second current-limiting circuit
End, the current output terminal of the second current-limiting circuit is electrically connected with display device.
Why current circuit is additionally provided between PMIC protection systems and display device, is because input is into PMIC
Electric current might not be equal with the output current of PMIC, during system electrification, peak current (peak current can be also produced in PMIC
More than normal current), if the electric current exported in PMIC is directly inputted in display device display device can be caused to be damaged, therefore,
Second current-limiting circuit is added between PMIC and display device, the electric current of the output of PMIC can be reduced, to reduce display
Device loads the dash current being subject to, so as to carry out effective protection to display device, it is to avoid it is damaged by peak current.
The display apparatus protecting system of the present embodiment includes the current limliting electricity of the PMIC protection systems of embodiment 3 and embodiment 1
Road, detailed description can refer to the current-limiting circuit of embodiment 1 and the PMIC protection systems of embodiment 3, will not be described here.
The display apparatus protecting system of the present embodiment, can reduce the electric current of the output of PMIC, be born with reducing display device
The dash current that load is subject to, so as to carry out effective protection to display device, it is to avoid it is damaged by peak current.
It is understood that the embodiment of above principle being intended to be merely illustrative of the present and the exemplary enforcement for adopting
Mode, but the invention is not limited in this.For those skilled in the art, in the essence without departing from the present invention
In the case of god and essence, various modifications and improvement can be made, these modifications and improvement are also considered as protection scope of the present invention.
Claims (9)
1. a kind of current-limiting circuit, it is characterised in that include：Current limliting module, switch module and charging time delay module；
The switch module connection first voltage end, charging time delay module and current output terminal；
The current limliting module connects the first voltage end and the current output terminal；
The charging time delay module connects the first voltage end and second voltage end；
The current limliting module, for carrying out partial pressure to the voltage that the first voltage end is input in power up phase, to limit
State the size of current that current output terminal is exported；
The charging time delay module, for after the circuit turn-on certain hour, for the switch module cut-in voltage being provided,
So that the current limliting module short circuit, and corresponding electric current is exported by the current output terminal.
2. current-limiting circuit according to claim 1, it is characterised in that the switch module includes switching tube, the switch
First pole of pipe is connected with the first voltage end, and the second pole of the switching tube is connected with the current output terminal, described to open
The control pole for closing pipe is connected with the charging time delay module.
3. current-limiting circuit according to claim 1, it is characterised in that the current limliting module includes first resistor, described the
The first end of one resistance is connected with the first voltage end, and the second end of the first resistor is connected with the current output terminal.
4. current-limiting circuit according to claim 1, it is characterised in that the charging time delay module includes electric capacity and second electric
Resistance, the first end of the second resistance is connected with the first voltage end, the second end and the electric capacity of the second resistance
First end connects, and the second end of the electric capacity is connected with the second voltage end.
5. a kind of driving method of current-limiting circuit, it is characterised in that include：
Power up phase：The first supply voltage is input into for first voltage end, is that charging time delay module charges, switch module is closed, and is led to
Cross current limliting module carries out partial pressure to the first supply voltage that the first voltage end is input into, to limit what current output terminal was exported
Size of current；
The stage of electric current output；Cut-in voltage is provided for switch module by the charging time delay module, switch module is opened, limit
Flow module short circuit, the current output terminal exports corresponding electric current.
6. a kind of PMIC protection systems, it is characterised in that including the current-limiting circuit described in Claims 1-4 any one.
7. PMIC protection systems according to claim 6, it is characterised in that also including power management integrated circuit；
The power management integrated circuit is electrically connected with the current output terminal of the current-limiting circuit.
8. a kind of display apparatus protecting system, it is characterised in that protect including the PMIC described in the claim 6 or 7 being sequentially connected
Protecting system, the second current-limiting circuit and display device, structure and the Claims 1-4 any one institute of second current-limiting circuit
The structure of the current-limiting circuit stated is identical.
9. display apparatus protecting system according to claim 8, it is characterised in that the power supply in the PMIC protection systems
The output end of management integrated circuit is the first voltage end of second current-limiting circuit, and the electric current of second current-limiting circuit is exported
End electrically connects with the display device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710080753.1A CN106602532B (en) | 2017-02-15 | 2017-02-15 | Current-limiting circuit and its driving method, PMIC protection system and display apparatus protecting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710080753.1A CN106602532B (en) | 2017-02-15 | 2017-02-15 | Current-limiting circuit and its driving method, PMIC protection system and display apparatus protecting system |
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| Publication Number | Publication Date |
|---|---|
| CN106602532A true CN106602532A (en) | 2017-04-26 |
| CN106602532B CN106602532B (en) | 2019-04-26 |
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ID=58587621
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| CN201710080753.1A Active CN106602532B (en) | 2017-02-15 | 2017-02-15 | Current-limiting circuit and its driving method, PMIC protection system and display apparatus protecting system |
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| CN107564457A (en) * | 2017-10-25 | 2018-01-09 | 上海中航光电子有限公司 | A kind of display panel and display device |
| CN109378810A (en) * | 2018-11-12 | 2019-02-22 | 西安昆仑工业（集团）有限责任公司 | A kind of small-bore aircraft gun power-off protection dash current suppression circuit |
| CN109767715A (en) * | 2019-03-11 | 2019-05-17 | 京东方科技集团股份有限公司 | Soft-start circuit, integrated power supply management circuit and display equipment |
| CN113937743A (en) * | 2021-10-18 | 2022-01-14 | 深圳英恒电子有限公司 | Impulse current suppression circuit |
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| US20090237850A1 (en) * | 2008-03-19 | 2009-09-24 | Wu Han-Tung | Over-voltage protection device |
| CN101964618A (en) * | 2009-07-22 | 2011-02-02 | 海洋王照明科技股份有限公司 | Anti-jamming motor drive circuit |
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| CN109378810A (en) * | 2018-11-12 | 2019-02-22 | 西安昆仑工业（集团）有限责任公司 | A kind of small-bore aircraft gun power-off protection dash current suppression circuit |
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| CN113937743A (en) * | 2021-10-18 | 2022-01-14 | 深圳英恒电子有限公司 | Impulse current suppression circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106602532B (en) | 2019-04-26 |
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