CN109449877A - Overcurrent protection method and display equipment - Google Patents
Overcurrent protection method and display equipment Download PDFInfo
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- CN109449877A CN109449877A CN201811465480.3A CN201811465480A CN109449877A CN 109449877 A CN109449877 A CN 109449877A CN 201811465480 A CN201811465480 A CN 201811465480A CN 109449877 A CN109449877 A CN 109449877A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
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Abstract
The present invention relates to overcurrent protection methods and display equipment.Provide a kind of overcurrent protection method, comprising: obtain peak point current when operating circuit works normally；Peak point current and preset look-up table when according to the normal work of acquisition, which determine, compares electric current；The electric current of real-time detection operating circuit in actual work；Electric current in actual work is compared with through determining comparison electric current；And control signal is exported according to comparison result, to control the on-off for being the power supply that operating circuit is powered.Above-mentioned overcurrent protection method; different comparison electric currents is set for different operating circuits; and by real-time detection to the electric current of real work compare electric current is compared to judge whether operating circuit short-circuit with this, so as to improve the accuracy of judgement, preferably protection operating circuit.Present invention also provides a kind of display equipment.
Description
Technical field
The present invention relates to electronic technology fields, relate more specifically to overcurrent protection method and display equipment.
Background technique
Currently, the over current protection protection mechanism of display panel gate driving circuit (GOA, gate driver on array) is
When the input current moment of detecting level translator becomes larger, i.e., by the dump of GOA circuit, to protect display panel grid
Driving circuit.
But in this fashion, the electric current detected is compared with fixed preset value, is then cut when more than preset value
Power-off source, does not cut off the power then when being less than.But because of processing procedure reason, often there is difference between the same machine, different pieces
Different, when such GOA circuit works normally or is short-circuit, the electric current of different pieces also can be different, if being done with the same value
It compares, it is possible to there is erroneous judgement, the GOA circuit of normal work is determined as short circuit and is cut off the power, or the GOA of short circuit is electric
Road is judged to working normally to be protected without cutting off the power.
Summary of the invention
Based on this, it is necessary to for the erroneous judgement problem of the working condition of above-mentioned GOA circuit, provide a kind of overcurrent protection side
Method, can accurately determine the working condition of GOA circuit, to carry out corresponding overcurrent protection.
According to an aspect of the invention, there is provided a kind of overcurrent protection method, this method comprises: obtaining operating circuit
Peak point current when normal work；Peak point current and preset look-up table when according to the normal work of acquisition, which determine, compares electricity
Stream；The electric current of real-time detection operating circuit in actual work；Electric current in actual work is carried out with through determining comparison electric current
Compare；And control signal is exported according to comparison result, to control the on-off for being the power supply that operating circuit is powered.
Peak point current when operating circuit works normally is obtained in one of the embodiments, comprising: obtains operating circuit
Peak point current when work；Judge whether the peak point current obtained meets preset condition, if so, the peak point current by acquisition is true
It is set to peak point current when operating circuit works normally.
In one of the embodiments, in look-up table include operating circuit work normally when peak point current and compare electric current
Functional relation, peak point current and compare electric current positive correlation.It peak point current when according to the normal work of acquisition and preset looks into
It looks for table to determine and compares electric current, comprising: peak point current and functional relation when according to the normal work of acquisition, which determine, compares electric current.
In one of the embodiments, in look-up table include multiple preset peak point currents and with multiple preset peak values
The corresponding multiple comparison electric currents of electric current, multiple preset peak point currents are positively correlated with corresponding multiple electric currents that compare.According to acquisition
Normal work when peak point current and preset look-up table determine compare electric current, comprising: determine obtain normal work when
The corresponding relationship of peak point current and multiple preset peak point currents；And it is determined according to corresponding relationship and compares electric current.
In one of the embodiments, in look-up table include N number of peak point current Peak1, Peak2, Peak3 ... PeakN and
Corresponding N number of comparison electric current OCP1, OCP2, OCP3 ... OCPN, wherein PeakN > PeakN-1 > ... > Peak2 >
Peak1, OCPN > OCPN-1 > ... > OCP2 > OCP1, wherein N is the integer greater than 1.Peak when according to the normal work of acquisition
Value electric current and the determining comparison electric current of preset look-up table, comprising: determine that peak point current Ipeak when working normally is preset with N number of
Peak point current corresponding relationship；As Ipeak≤Peak1, electric current will be compared and be determined as OCP1；When PeakM-1 < Ipeak≤
When PeakM, electric current will be compared and be determined as OCPM, wherein M is the integer greater than 1 and less than or equal to N；And work as Ipeak > PeakN
When, electric current will be compared and be determined as OCPN.
The electric current of real-time detection operating circuit in actual work in one of the embodiments, comprising: real-time detection work
Average current when circuit works.
Control signal is exported according to comparison result in one of the embodiments, to control the electricity for being operating circuit power supply
The on-off in source, comprising: when electric current in actual work is greater than through determining comparison electric current, output control signal, to be broken as
The power supply of operating circuit power supply.
Operating circuit is the gate driving circuit of display panel in one of the embodiments,.
Above-mentioned overcurrent protection method, the peak point current and preset when by being worked normally according to the operating circuit of acquisition
Look-up table, which determines, compares electric current, and by real-time detection to the electric current of real work compare electric current with this and be compared to judge work
Make whether circuit is short-circuit, different comparison electric currents can be set for different operating circuits, so as to improve the accurate of judgement
Property, preferably protect operating circuit.
According to another aspect of the present invention, a kind of overcurrent protection method is provided, this method comprises: obtaining work electricity
Peak point current when road works normally；Pair of peak point current and multiple preset peak point currents when the determining normal work obtained
It should be related to；Multiple preset one compared in electric current are determined as and the peak point current pair when working normally according to corresponding relationship
The comparison electric current answered, multiple preset comparison electric currents are corresponding with multiple preset peak point currents；Real-time detection operating circuit is practical
Electric current when work；Corresponding electric current is compared by electric current in actual work and through the determining peak point current with when working normally
It is compared；And corresponding electricity is compared through the determining peak point current with when working normally when electric current in actual work is greater than
When stream, output control signal, to be broken as the power supply of operating circuit power supply.
According to a further aspect of the invention, a kind of display equipment is provided, which includes: overcurrent protection dress
It sets, overcurrent protection includes processor and memory, and processor is for executing computer program stored in memory
To perform the steps of the peak point current obtained when operating circuit works normally；Peak value electricity when according to the normal work of acquisition
Stream and preset look-up table, which determine, compares electric current；The electric current of operating circuit in actual work is obtained in real time；It will in actual work
Electric current is compared with through determining comparison electric current；And control signal is exported according to comparison result, to control as operating circuit
The on-off of the power supply of power supply.
Detailed description of the invention
The preferred rather than embodiment of limitation of the invention will be described with reference to attached drawing by way of example, in which:
Fig. 1 shows the flow chart of overcurrent protection method in one embodiment of the application；
Fig. 2 shows the flow charts of the step S110 of method shown in FIG. 1；
Fig. 3 shows the circuit diagram that the step S120 of method shown in FIG. 1 is realized in one embodiment of the application；
Fig. 4 shows the flow chart of overcurrent protection method in one embodiment of the application.
Specific embodiment
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing to the present invention
Specific embodiment be described in detail.Many details are explained in the following description in order to fully understand this hair
It is bright.But the invention can be embodied in many other ways as described herein, those skilled in the art can be not
Similar improvement is done in the case where violating intension of the present invention, therefore the present invention is not limited to the specific embodiments disclosed below.
Unless otherwise defined, all technical and scientific terms used herein and belong to technical field of the invention
The normally understood meaning of technical staff is identical.Term as used herein in the specification of the present invention is intended merely to description tool
The purpose of the embodiment of body, it is not intended that in the limitation present invention.Each technical characteristic of above embodiments can carry out arbitrary group
It closes, for simplicity of description, combination not all possible to each technical characteristic in above-described embodiment is all described, however,
As long as there is no contradiction in the combination of these technical features, all should be considered as described in this specification.
The embodiment of the present application provides a kind of overcurrent protection method, as shown in Figure 1, this method may include walking as follows
It is rapid:
Step S110 obtains peak point current when operating circuit works normally.
Illustratively, the operating circuit in the present embodiment is the gate driving circuit of display panel, but the present invention is not limited to
This.Because of processing procedure reason, often discrepant between the same machine, different pieces, such gate driving circuit circuit is normal
When work or short circuit, the electric current of different pieces also can be different.Therefore, it is necessary to obtain peak value when gate driving circuit works normally
Electric current.Peak point current when gate driving circuit works normally can be obtained by current detector.
Step S120, peak point current and preset look-up table when according to the normal work of acquisition, which determine, compares electric current.
Specifically, comprising peak point current and the corresponding relationship for comparing electric current in look-up table, when according to the normal work of acquisition
Peak point current and preset look-up table be assured that comparison electric current.Comparing electric current is threshold current, when operating circuit
When electric current in actual work is greater than comparison electric current, start overcurrent protection.
Step S130, the electric current of real-time detection operating circuit in actual work.
Specifically, the electric current of current detector real-time detection gate driving circuit in actual work can be passed through.
Electric current in actual work is compared by step S140 with through determining comparison electric current.
Specifically, by real-time detection to electric current in actual work be compared with the comparison electric current determined.
Step S150 exports control signal according to comparison result, to control the on-off for being the power supply that operating circuit is powered.
Specifically, control signal is exported according to comparison result, to control the on-off for being the power supply that gate driving circuit is powered,
To carry out overcurrent protection.
Above-mentioned overcurrent protection method, the peak point current and preset when by being worked normally according to the operating circuit of acquisition
Look-up table, which determines, compares electric current, and by real-time detection to the electric current of real work compare electric current with this and be compared to judge work
Make whether circuit is short-circuit, different comparison electric currents can be set for different operating circuits, so as to improve the accurate of judgement
Property, preferably protect operating circuit.
In one embodiment, as shown in Fig. 2, step S110, obtains peak point current when operating circuit works normally, packet
It includes:
Step S111 obtains peak point current when operating circuit work.
Specifically, the peak point current when work of detection operating circuit.
Step S112, judges whether the peak point current obtained meets preset condition, if so, thening follow the steps S113, otherwise
Execute step S111.
The peak point current of acquisition is determined as peak point current when operating circuit works normally by step S113.
Specifically, after the peak point current for detecting operating circuit, need to judge whether the peak point current is the operating circuit
Operating current when normal work.Therefore, it is necessary to judge whether the peak point current obtained meets preset condition.In one embodiment
In, preset condition are as follows: peak point current of the operating circuit when working under multiple groups control signal is equal.It is controlled by comparing in multiple groups
Peak point current when working under signal is come operating current when determining whether to work normally, if electric current is almost the same, then it is assumed that
The operating circuit is to work normally, and the peak point current measured is determined as peak point current when working normally.If obtaining
Peak point current be unsatisfactory for preset condition, then reacquire peak point current, until obtain operating circuit work normally when peak value
Electric current.
Overcurrent protection method in above-described embodiment judges by the way that whether the electric current that judgement measures meets preset condition
Electric current when whether the electric current of acquisition is normal work, so that peak point current when accurately working normally is obtained, thus in step
The comparison electric current determined in rapid S120 is more accurate, so that overcurrent protection is more acurrate, reduces the probability judged by accident.
It in one embodiment, include peak point current when operating circuit works normally in look-up table and compare the letter of electric current
Number relationship, peak point current are positively correlated with electric current is compared.Step S120, peak point current when according to the normal work of acquisition and default
Look-up table determine and compare electric current, comprising: peak point current when according to the normal work of acquisition and functional relation determine and compare electricity
Stream.
It specifically, include peak point current when operating circuit works normally in look-up table and compare the functional relation of electric current,
A peak point current is inputted, i.e., an exportable corresponding comparison electric current, peak point current is positively correlated with electric current is compared, i.e. peak
It is bigger to be worth electric current, it is bigger to compare electric current.Step S120, peak point current and preset look-up table when according to the normal work of acquisition
It determines and compares electric current, comprising: peak point current and functional relation when according to the normal work of acquisition, which determine, compares electric current.
In one embodiment, in look-up table include multiple preset peak point currents and with multiple preset peak point currents
Corresponding multiple comparison electric currents, multiple preset peak point currents and corresponding multiple comparison electric currents are positively correlated.Step S120,
Peak point current and preset look-up table when according to the normal work of acquisition, which determine, compares electric current, comprising: determines the normal of acquisition
The corresponding relationship of peak point current and multiple preset peak point currents when work；And it is determined according to corresponding relationship and compares electric current.
In one embodiment, in look-up table include N number of peak point current Peak1, Peak2, Peak3 ... PeakN,
(PeakN > PeakN-1 > ... > Peak2 > Peak1) and corresponding N number of comparison electric current OCP1, OCP2, OCP3 ... OCPN
(OCPN > OCPN-1 > ... > OCP2 > OCP1), then determine the electric current when operating circuit obtained in step S110 works normally
The corresponding relationship of Ipeak and N number of peak point current determine further according to corresponding relationship and compare electric current.Specifically, as Ipeak≤Peak1
When, electric current will be compared and be determined as OCP1；As PeakM-1 < Ipeak≤PeakM, electric current will be compared and be determined as OCPM, wherein M is
Integer greater than 1 and less than or equal to N；As Ipeak > PeakN, electric current will be compared and be determined as OCPN.For example, when Peak1 <
When Ipeak≤Peak2, electric current will be compared and be determined as OCP2；As Peak2 < Ipeak≤Peak3, electric current will be compared and be determined as
OCP3；... as PeakN-1 < Ipeak≤PeakN, electric current will be compared and be determined as OCPN.Wherein N is the integer greater than 1.It can
With the value of N determines according to actual conditions.Peak point current is related with the load of gate driving circuit, and load is bigger, and peak point current is got over
Greatly.Comparing electric current can determine according to electric current when working normally with abnormal current when just short circuit.
In one embodiment, method shown in FIG. 1 is realized in one embodiment of the application as shown in figure 3, showing
Step S120 circuit diagram.Specifically, the electric current of acquisition is converted into voltage first, i.e., on the route of detection electric current
It connects a resistance, then the ohmically voltage is the crest voltage after peak point current conversion, which is applied separately to
The grid of multiple transistors (3 transistors Q1, Q2, Q3 are schematically shown in Fig. 3), will touch voltage be applied to it is multiple
The source level of transistor, and the drain electrode of multiple transistor is connected to look-up table means.The threshold voltage of multiple transistors is different.
In Fig. 3, U1 (threshold voltage of Q1) > U2 (threshold voltage of Q2) > U3 (threshold voltage of Q3), multiple threshold voltages with it is multiple
Peak point current is corresponding, i.e., with multiple to compare electric current corresponding.Which crystalline substance voltage after the peak point current conversion detected can be connected
Body pipe, then representing, which start the transistor, corresponds to the matched comparison electric current of peak point current.For example, as the voltage U > U1 detected
When, Q1, Q2, Q3 are both turned on, and are preferentially taken and corresponding with Q1 are compared electric current；When the voltage U detected is between U1 and U2, Q2,
Q3 is both turned on, and is preferentially taken and corresponding with Q2 is compared electric current；And so on.
Overcurrent protection method in above-described embodiment, by be arranged in a lookup table multiple peak current thresholds and with
The corresponding multiple comparison electric currents of peak current threshold, can determine corresponding comparison electric current according to the peak point current of acquisition, thus
It can be improved the accuracy rate of overcurrent judgement.
In one embodiment, step S130, the electric current of real-time detection operating circuit in actual work, comprising: inspection in real time
Survey average current when operating circuit work.
Specifically, the operating current detected in step S130 is the average current in a cycle.Ratio in look-up table
Average current when being according to work to electric current is determined with abnormal current when just short circuit.
Overcurrent protection method in above-described embodiment detects average current when operating circuit actual act, and should
Average current is compared to determine whether to disconnect power supply with electric current is compared, and by detecting average current, can reduce erroneous judgement
Probability.
In one embodiment, control signal is exported according to comparison result, to control the power supply for being operating circuit power supply
On-off, comprising: when electric current in actual work is greater than through determining comparison electric current, output control signal, to be broken as work
The power supply of circuit power supply.
Specifically, when electric current in actual work is greater than through determining comparison electric current, output control signal, to be broken as
The power supply of operating circuit power supply, to realize overcurrent protection；When electric current in actual work is less than or equal to through determining comparison
When electric current, the operating circuit is worked normally.
The present embodiment additionally provides a kind of overcurrent protection method, as shown in figure 4, method includes the following steps:
Step S210 obtains peak point current when operating circuit works normally；
Step S220, the peak point current pass corresponding with multiple preset peak point currents when determining the normal work obtained
System；
Step S230, when multiple preset one compared in electric current being determined as and worked normally according to corresponding relationship
The corresponding comparison electric current of peak point current, multiple preset comparison electric currents are corresponding with multiple preset peak point currents；
Step S240, the electric current of real-time detection operating circuit in actual work；
Step S250 corresponding is compared by electric current in actual work and through the determining peak point current with when working normally
Electric current is compared；And
Step S260, when electric current in actual work is greater than through determining ratio corresponding with peak point current when working normally
When to electric current, output control signal, to be broken as the power supply of operating circuit power supply.
Above-mentioned overcurrent protection method, the peak point current and multiple pre- when by being worked normally according to the operating circuit of acquisition
If peak point current corresponding relationship by it is multiple it is preset compare electric currents in one be determined as with work normally when peak value electricity
Corresponding comparison electric current is flowed, plurality of preset comparison electric current is corresponding with multiple preset peak point currents, and by real-time detection
To the electric current of real work compare electric current is compared to judge whether operating circuit short-circuit with this, so as to be different negative
Different comparison electric currents is arranged in the operating circuit of load, and then the accuracy of judgement can be improved, preferably protection operating circuit.
The embodiment of the invention also provides a kind of display equipment, which includes overcurrent protection, overcurrent
Protective device includes processor and memory, and processor is following to realize for executing computer program stored in memory
Step:
Obtain peak point current when operating circuit works normally；
Peak point current and preset look-up table when according to the normal work of acquisition, which determine, compares electric current；
The electric current of operating circuit in actual work is obtained in real time；
Electric current in actual work is compared with through determining comparison electric current；And
Control signal is exported according to comparison result, to control the on-off for being the power supply that operating circuit is powered.
In one embodiment, which is liquid crystal display.Overcurrent protection is arranged in liquid crystal display
Drive circuit board on.In another embodiment, which is OLED (Organic Light-Emitting
Diode, Organic Light Emitting Diode) display.
Each technical characteristic of embodiment of above can be combined arbitrarily, for simplicity of description, not to above-mentioned implementation
The all possible combination of each technical characteristic in mode is 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.
Only several embodiments of the present invention are expressed for embodiment of above, and the description thereof is more specific and detailed, but not
It can therefore be construed as limiting the scope of the patent.It should be pointed out that for those of ordinary skill in the art,
Without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection model of the invention
It encloses.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (10)
1. a kind of overcurrent protection method, which is characterized in that the described method includes:
Obtain peak point current when operating circuit works normally；
Peak point current and preset look-up table when according to the normal work of acquisition, which determine, compares electric current；
The electric current of operating circuit described in real-time detection in actual work；
The electric current in actual work is compared with through the determining electric current that compares；And
Control signal is exported according to comparison result, to control the on-off for being the power supply that the operating circuit is powered.
2. overcurrent protection method according to claim 1, which is characterized in that when the acquisition operating circuit works normally
Peak point current, comprising:
Obtain peak point current when operating circuit work；
Judge whether the peak point current obtained meets preset condition, if so, the peak point current of acquisition is determined as
The peak point current when operating circuit works normally.
3. overcurrent protection method according to claim 1, which is characterized in that in the look-up table just including operating circuit
Often peak point current when work and the functional relation for comparing electric current, the peak point current and the electric current that compares are positively correlated；
Peak point current and preset look-up table when the normal work according to acquisition, which determine, compares electric current, comprising:
Peak point current and the functional relation when according to the normal work of acquisition determine the comparison electric current.
4. overcurrent protection method according to claim 1, which is characterized in that include multiple preset in the look-up table
Peak point current and corresponding with the multiple preset peak point current multiple compare electric current, the multiple preset peak point current
It is positively correlated with the corresponding the multiple electric current that compares；
Peak point current and preset look-up table when the normal work according to acquisition, which determine, compares electric current, comprising:
The corresponding relationship of peak point current and the multiple preset peak point current when the determining normal work obtained；And
The comparison electric current is determined according to the corresponding relationship.
5. overcurrent protection method according to claim 1, which is characterized in that include N number of peak value electricity in the look-up table
Flow Peak1, Peak2, Peak3 ... PeakN and corresponding N number of comparison electric current OCP1, OCP2, OCP3 ... OCPN, wherein
PeakN > PeakN-1 > ... > Peak2 > Peak1, OCPN > OCPN-1 > ... > OCP2 > OCP1, wherein N is whole greater than 1
Number；
Peak point current and preset look-up table when the normal work according to acquisition, which determine, compares electric current, comprising:
The corresponding relationship of peak point current Ipeak and N number of preset peak point current when determining the normal work；
As Ipeak≤Peak1, the comparison electric current is determined as OCP1；
As PeakM-1 < Ipeak≤PeakM, the comparison electric current is determined as OCPM, wherein M is greater than 1 and to be less than or equal to N
Integer；And
As Ipeak > PeakN, the comparison electric current is determined as OCPN.
6. overcurrent protection method according to claim 1, which is characterized in that operating circuit described in the real-time detection is real
Electric current when border works, comprising:
Average current when operating circuit described in real-time detection works.
7. overcurrent protection method according to claim 1 to 6, which is characterized in that described according to comparison result
Output control signal, to control the on-off for being the power supply that the operating circuit is powered, comprising:
When the electric current in actual work is greater than through the determining comparison electric current, output control signal, to be broken as
State the power supply of operating circuit power supply.
8. overcurrent protection method according to claim 1 to 6, which is characterized in that the operating circuit is aobvious
Show the gate driving circuit of panel.
9. a kind of overcurrent protection method, which is characterized in that the described method includes:
Obtain peak point current when operating circuit works normally；
The corresponding relationship of peak point current and multiple preset peak point currents when the determining normal work obtained；
One in multiple preset comparison electric currents is determined as and the peak value when normal work according to the corresponding relationship
The corresponding comparison electric current of electric current, the multiple preset comparison electric current are corresponding with the multiple preset peak point current；
The electric current of operating circuit described in real-time detection in actual work；
It corresponding with peak point current when the normal work described is compared by the electric current in actual work and through determining
Electric current is compared；And
When the electric current in actual work is greater than through the determining ratio corresponding with peak point current when the normal work
When to electric current, output control signal, to be broken as the power supply of the operating circuit power supply.
10. a kind of display equipment, which is characterized in that including overcurrent protection, the overcurrent protection includes processing
Device and memory, the processor are used to execute the computer program of storage in the memory to perform the steps of
Obtain peak point current when operating circuit works normally；
Peak point current and preset look-up table when according to the normal work of acquisition, which determine, compares electric current；
The electric current of the operating circuit in actual work is obtained in real time；
The electric current in actual work is compared with through the determining electric current that compares；And
Control signal is exported according to comparison result, to control the on-off for being the power supply that the operating circuit is powered.
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| CN201811465480.3A CN109449877B (en) | 2018-12-03 | 2018-12-03 | Overcurrent protection method and display device |
| PCT/CN2018/120583 WO2020113637A1 (en) | 2018-12-03 | 2018-12-12 | Overcurrent protection method and display device |
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| CN201811465480.3A CN109449877B (en) | 2018-12-03 | 2018-12-03 | Overcurrent protection method and display device |
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| Publication number | Publication date |
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| WO2020113637A1 (en) | 2020-06-11 |
| CN109449877B (en) | 2020-05-12 |
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