CN109672146B - Power supply overvoltage protection device and display device - Google Patents
Power supply overvoltage protection device and display device Download PDFInfo
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- CN109672146B CN109672146B CN201811570105.5A CN201811570105A CN109672146B CN 109672146 B CN109672146 B CN 109672146B CN 201811570105 A CN201811570105 A CN 201811570105A CN 109672146 B CN109672146 B CN 109672146B
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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
- H02H7/10—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 converters; for rectifiers
- H02H7/12—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 converters; for rectifiers for static converters or rectifiers
- H02H7/1213—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 converters; for rectifiers for static converters or rectifiers for DC-DC converters
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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
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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
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/04—Display protection
Abstract
The application relates to a power supply overvoltage protection device and a display device, wherein a first end of an output voltage comparison module in the power supply overvoltage protection device is used for being connected with an output end of a power supply, and a second end of the output voltage comparison module is connected with a first pole of a first electronic switch and used for controlling the on-off state of the first electronic switch according to the comparison result of the output voltage of the power supply and a first threshold voltage; the second pole of the first electronic switch is used for connecting the output end of the power supply, and the third pole of the first electronic switch is connected with the first pin of the capacitor; the second pin of the capacitor is grounded; the first end of the power supply control module is connected with the first pin of the capacitor, the second end of the power supply control module is used for being connected with the control end of the power supply, and the power supply control module is used for controlling the power supply state of the power supply according to the comparison result of the charging voltage of the capacitor and the second threshold voltage. The application provides a power supply overvoltage crowbar can get rid of the circumstances that the output voltage that leads to because of external noise signal risees to improve the stability and the reliability of power supply.
Description
Technical Field
The invention relates to the technical field of power supply protection, in particular to a power supply overvoltage protection device and a display device.
Background
When the display panel displays, the power supply integrated circuit is required to provide different voltages for the pixel electrode, the common electrode and the like of each sub-pixel, but in the actual working process, due to the influence of the outside or a load, the situation of overhigh output voltage can occur, and if the protection is not carried out in time, the power supply integrated circuit can be damaged due to overhigh output voltage, and then the display of the panel is influenced.
At present, in order to solve the problem, the magnitude of the output voltage is usually detected, and when the output voltage is detected to be higher than a certain threshold voltage, a transistor in a power supply integrated circuit is turned off, so as to rapidly reduce the output voltage, thereby achieving the purpose of overvoltage protection.
In the implementation process, the inventor finds that the traditional technology has at least the following disadvantages: when the output voltage is detected to exceed the threshold voltage, a transistor in the power supply integrated circuit is directly turned off, and sometimes, voltage rise caused by an external noise signal causes malfunction to affect the display effect.
Disclosure of Invention
Therefore, it is necessary to provide a power supply overvoltage protection device and a display device for solving the problem that an overvoltage protection circuit causes misoperation due to an external noise signal.
On one hand, the embodiment of the invention provides a power supply overvoltage protection device, which comprises an output voltage comparison module, a first electronic switch, a capacitor and a power supply control module, wherein the output voltage comparison module is used for comparing the output voltage of the power supply overvoltage protection device with the output voltage of the power supply overvoltage protection device;
the first end of the output voltage comparison module is used for being connected with the output end of the power supply, the second end of the output voltage comparison module is connected with the first pole of the first electronic switch, and the output voltage comparison module is used for controlling the on-off state of the first electronic switch according to the comparison result of the output voltage of the power supply and the first threshold voltage;
the second pole of the first electronic switch is used for connecting the output end of the power supply, and the third pole of the first electronic switch is connected with the first pin of the capacitor; the second pin of the capacitor is grounded;
the first end of the power supply control module is connected with the first pin of the capacitor, the second end of the power supply control module is used for being connected with the control end of the power supply, and the power supply control module is used for controlling the power supply state of the power supply according to the comparison result of the charging voltage of the capacitor and the second threshold voltage.
In one embodiment, the output voltage comparison module comprises a first voltage sensor and a first voltage comparator;
the input end of the first voltage sensor is used for being connected with the output end of the power supply, and the output end of the first voltage sensor is connected with the input voltage end of the first voltage comparator;
the reference voltage end of the first voltage comparator is used for accessing a first threshold voltage;
the output of the first voltage comparator is connected to the first pole of the first electronic switch.
In one embodiment, the output voltage comparison module further includes a first transformer, an input terminal of the first transformer is connected to the output terminal of the first voltage comparator, and an output terminal of the first transformer is connected to the first pole of the first electronic switch.
In one embodiment, the power supply control module comprises a second voltage sensor and a second voltage comparator;
the input end of the second voltage sensor is connected with the first pin of the capacitor, and the output end of the second voltage sensor is connected with the input voltage end of the second voltage comparator;
the reference voltage end of the second voltage comparator is used for accessing a second threshold voltage;
the output end of the second voltage comparator is used for being connected with the control end of the power supply.
In one embodiment, the power supply control module further includes a second transformer, an input terminal of the second transformer is connected to the output terminal of the second voltage comparator, and an output terminal of the second transformer is used for being connected to the control terminal of the power supply.
In one embodiment, the first electronic switch is a first field effect transistor, a gate of the first field effect transistor is connected to the second terminal of the output voltage comparison module, a drain of the first field effect transistor is used for connecting an output terminal of the power supply, and a source of the first field effect transistor is connected to the first pin of the capacitor.
In one embodiment, the power supply includes a second electronic switch, the output terminal of the second transformer is used for connecting a first pole of the second electronic switch, the first terminal of the output voltage comparison module is used for connecting a second pole of the second electronic switch, and a third pole of the second electronic switch is used for connecting an external power supply.
A display device comprises a display panel, a power supply and the power supply overvoltage protection device, wherein the output end of the power supply is connected with the display panel and used for providing a working power supply for the display panel;
the first end of the output voltage comparison module is connected with the output end of the power supply, and the second end of the output voltage comparison module is connected with the first pole of the first electronic switch;
the second pole of the first electronic switch is connected with the output end of the power supply, and the third pole of the first electronic switch is connected with the first pin of the capacitor; the second pin of the capacitor is grounded;
the first end of the power supply control module is connected with the first pin of the capacitor, and the second end of the power supply control module is connected with the control end of the power supply.
In one embodiment, the display panel includes a plurality of pixel electrodes, and the output terminals of the power supply are respectively connected to the pixel electrodes.
In one embodiment, the display panel comprises a plurality of sub-pixels arranged in an array, a scanning line arranged along a first direction and a plurality of data lines arranged along a direction perpendicular to the scanning line; the sub-pixel comprises an active array switch, liquid crystal and a common electrode;
the drain electrode of each active array switch is connected with the corresponding data line, the grid electrode of each active array switch is connected with the corresponding scanning line, the source electrode of each active array switch is connected with one end of the liquid crystal, and the other end of the liquid crystal is connected with the common electrode.
One or more embodiments of the present invention have at least the following beneficial effects: the power supply overvoltage protection device provided by the embodiment of the invention comprises an output voltage comparison module, a first electronic switch, a capacitor and a power supply control module; the output voltage comparison module obtains the output voltage of the power supply, and compares with the first threshold voltage, if the output voltage is higher than the first threshold voltage, then output electric signal to the first electronic switch, in order to close the first electronic switch, the power supply begins to charge to the capacitor, the power supply control module collects the charging voltage of the capacitor, judge whether the charging voltage of the capacitor is greater than the second threshold voltage, if greater than the second threshold voltage, then control the power supply to reduce the output voltage, in order to prevent the output voltage from being too high to cause the damage of the supplied equipment (such as a display panel, etc.), and through adopting the circuit structure of the first electronic switch and the capacitor, the false operation caused by the output voltage of the power supply caused by the external noise signal can be excluded, thereby improving the stability and reliability of power supply.
Drawings
FIG. 1 is a schematic structural diagram of an overvoltage protection device for a power supply in one embodiment;
FIG. 2 is a schematic structural diagram of an overvoltage protection device for a power supply according to still another embodiment;
fig. 3 is a schematic structural diagram of a display device in one embodiment.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element and be integral therewith, or intervening elements may also be present. The terms "mounted," "one end," "the other end," and the like are used herein for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The embodiment of the invention provides a power supply overvoltage protection device, as shown in fig. 1, which comprises an output voltage comparison module 10, a first electronic switch 20, a capacitor 30 and a power supply control module 40; the first end of the output voltage comparing module 10 is used for connecting the output end of the power supply 50, and the second end is connected to the first pole of the first electronic switch 20, and is used for controlling the on-off state of the first electronic switch 20 according to the comparison result between the output voltage of the power supply 50 and the first threshold voltage; the second pole of the first electronic switch 20 is used for connecting the output end of the power supply 50, and the third pole is connected with the first pin of the capacitor 30; the second pin of the capacitor 30 is grounded; the first terminal of the power supply control module 40 is connected to the first pin of the capacitor 30, the second terminal is used for being connected to the control terminal of the power supply 50, and the power supply control module 40 is used for controlling the power supply state of the power supply 50 according to the comparison result between the charging voltage of the capacitor 30 and the second threshold voltage.
The output voltage comparing module 10 is a circuit that can compare the output voltage of the power supply 50 with the first threshold voltage and output different electrical signals according to the comparison result. The first electronic switch 20 is a switch controlled by an electric signal, and may be a MOS transistor, a transistor, or the like, for example. The power supply 50 may be a DC conversion power supply, and may be a DC-DC conversion power supply, for example. The power supply control module 40 may be a circuit or a device or the like having a voltage comparison function and capable of outputting a control signal to control the power supply state of the power supply 50. The first threshold voltage is the lowest voltage value for turning on the first electronic switch 20. The second threshold voltage refers to a lowest voltage value for controlling the power supply 50 to rapidly decrease the power supply voltage.
Specifically, the output voltage comparison module 10 obtains the voltage output by the power supply 50 in real time, and compares the voltage with a first threshold voltage, if the output voltage of the power supply 50 is greater than the first threshold voltage, it indicates that an over-high output voltage may occur at present, at this time, the output voltage comparison module 10 outputs an electrical signal to control the first electronic switch 20 to be closed, and the power supply 50 starts to charge the capacitor 30. If the external noise signal is only detected, the charging value of the capacitor 30 does not reach the second threshold voltage, at this time, the charging voltage of the capacitor 30 collected by the power supply control module 40 does not exceed the second threshold voltage, and at this time, the working state of the power supply 50 is maintained, and the power supply control module 40 does not execute a control action.
If the output voltage is increased not by the temporary external noise signal but by the continuous increase of the output voltage caused by the power supply 50, the power supply 50 charges the capacitor 30 after the first electronic switch 20 is turned on. At this time, if the charging voltage of the capacitor 30 collected by the power supply control module 40 is higher than the second threshold voltage, it indicates that the output voltage of the power supply 50 is continuously too high, and it is not because of a temporary external noise signal or a load influence, and the output of the power supply 50 needs to be adjusted, and the power supply control module 40 controls to quickly reduce the output voltage of the power supply 50, so as to avoid damage to the power supply 50 and damage to the powered device (such as the display panel 1).
In one embodiment, as shown in fig. 2, the output voltage comparison module 10 includes a first voltage sensor 11 and a first voltage comparator 12; the input end of the first voltage sensor 11 is used for connecting the output end of the power supply 50, and the output end of the first voltage sensor 11 is connected with the input voltage end of the first voltage comparator 12; the reference voltage terminal of the first voltage comparator 12 is used for accessing a first threshold voltage; the output of the first voltage comparator 12 is connected to a first pole of a first electronic switch 20.
The voltage sensor is a sensor which can sense the measured voltage and convert the measured voltage into a usable output signal. The voltage comparator is a circuit that discriminates and compares input signals. Specifically, the first voltage sensor 11 collects a voltage signal output by the power supply 50 and transmits the voltage signal to the first voltage comparator 12, the first voltage comparator 12 compares the received voltage signal with a first threshold voltage accessed by a reference voltage terminal, and if the voltage signal is greater than the first threshold voltage, the first voltage comparator 12 outputs an electric signal to drive the first electronic switch 20 to be turned on. After the first electronic switch 20 is turned on, the charging path from the output terminal of the power supply 50 to the capacitor 30 is turned on, and the capacitor 30 starts to be charged, meanwhile, the power supply control module 40 obtains the charging voltage of the capacitor 30, detects whether the charging voltage of the capacitor 30 increases to a second threshold voltage, and controls the power supply 50 to reduce the output voltage if the charging voltage is greater than the second threshold voltage. For example, if the output stage of the power supply 50 includes a switching MOS transistor, the output voltage of the power supply 50 may be reduced by turning off the switching MOS transistor of the output stage.
In one embodiment, as shown in fig. 2, the output voltage comparison module 10 further includes a first transformer 13, an input terminal of the first transformer 13 is connected to the output terminal of the first voltage comparator 12, and an output terminal of the first transformer 13 is connected to the first pole of the first electronic switch 20.
Specifically, the first voltage comparator 12 outputs an electrical signal to the first transformer 13 when detecting that the output voltage of the power supply 50 is greater than the first threshold voltage, and converts the voltage of the electrical signal into an electrical signal with a suitable magnitude after the voltage conversion is performed by the first transformer 13, so as to drive the first electronic switch 20 to be turned on.
In one embodiment, as shown in fig. 2, the power supply control module 40 includes a second voltage sensor 41 and a second voltage comparator 42; the input end of the second voltage sensor 41 is connected to the first pin of the capacitor 30, and the output end of the second voltage sensor 41 is connected to the input voltage end of the second voltage comparator 42; the reference voltage terminal of the second voltage comparator 42 is used for accessing a second threshold voltage; the output terminal of the second voltage comparator 42 is used for connecting the control terminal of the power supply 50.
Specifically, when the output voltage comparing module 10 detects that the output voltage of the power supply 50 is higher than the first threshold voltage, the output voltage comparing module 10 controls the first electronic switch 20 to be closed, and the power supply 50 starts to charge the capacitor 30. The second voltage sensor 41 collects the charging voltage of the capacitor 30 and transmits the collected voltage signal to the second voltage comparator 42, and if the second voltage comparator 42 detects that the charging voltage of the capacitor 30 is higher than the second threshold voltage, the power supply 50 is controlled to decrease the output voltage. If the second voltage comparator 42 detects that the charging voltage of the capacitor 30 is not higher than the second threshold voltage, it indicates that the sudden change of the output voltage of the power supply 50 currently is possibly caused by an external noise signal or a load, at this time, the power supply control module 40 does not control the power supply 50, and maintains the current power supply state of the power supply 50.
In one embodiment, as shown in fig. 2, the power supply control module 40 further includes a second transformer 43, an input terminal of the second transformer 43 is connected to the output terminal of the second voltage comparator 42, and an output terminal of the second transformer 43 is used for connecting to the control terminal of the power supply 50.
Specifically, when the output voltage comparing module 10 detects that the output voltage of the power supply 50 is higher than the first threshold voltage, the output voltage comparing module 10 controls the first electronic switch 20 to be closed, and the power supply 50 starts to charge the capacitor 30. The second voltage sensor 41 collects the charging voltage of the capacitor 30 and transmits the collected voltage signal to the second voltage comparator 42, and if the second voltage comparator 42 detects that the charging voltage of the capacitor 30 is higher than the second threshold voltage, the second voltage comparator outputs an electrical signal to the second transformer 43, and after the electrical signal is changed by the second transformer 43, the second voltage comparator generates a suitable electrical signal to control the power supply 50 to reduce the output voltage.
In one embodiment, as shown in fig. 2, the first electronic switch 20 is a first fet Q1, a gate G1 of the first fet Q1 is connected to the second terminal of the output voltage comparison module 10, a drain D1 is used for connecting to the output terminal of the power supply 50, and a source S1 is connected to the first pin of the capacitor 30.
Specifically, when the output voltage comparing module 10 detects that the output voltage of the power supply 50 is higher than the first threshold voltage, it outputs an electrical signal to the gate G1 of the first fet Q1, and drives the first fet Q1 to open via the gate G1, and then the power supply 50 charges the capacitor 30 via the drain D1 and the source S1 of the first fet Q1.
In one embodiment, as shown in fig. 2, the power supply 50 includes a second electronic switch, the output terminal of the second transformer 43 is used for connecting a first pole of the second electronic switch, the first terminal of the output voltage comparison module 10 is used for connecting a second pole of the second electronic switch, and a third pole of the second electronic switch is used for connecting an external power supply.
The power supply control module 40 controls the power supply state of the power supply 50, and can achieve the purpose of rapidly reducing the output voltage by controlling the on-off state of the second electronic switch in the power supply 50. If the output voltage comparison module 10 detects that the output voltage of the power supply 50 is higher than the first threshold voltage, the first electronic switch 20 is controlled to be turned on, and if the power supply control module 40 detects that the charging voltage of the capacitor 30 is higher than the second threshold voltage, the power supply control module outputs an electrical signal to control the second electronic switch to be turned off, so as to rapidly reduce the output voltage of the power supply 50. Wherein, the second electronic switch may be a MOS transistor of the output stage of the power supply 50.
A display device, as shown in FIG. 3, comprises a display panel 1, a power supply 50 and the power supply overvoltage protection device 2, wherein the output end of the power supply 50 is connected with the display panel 1 and is used for providing a working power supply for the display panel 1; the first end of the output voltage comparison module 10 is connected to the output end of the power supply 50, and the second end is connected to the first pole of the first electronic switch 20; the second pole of the first electronic switch 20 is connected to the output end of the power supply 50, and the third pole is connected to the first pin of the capacitor 30; the second pin of the capacitor 30 is grounded; the first terminal of the power supply control module 40 is connected to the first pin of the capacitor 30, and the second terminal is connected to the control terminal of the power supply 50.
The power supply overvoltage protection device 2 is consistent with the structure and the working principle described in the above embodiments, and is not described herein. The display panel 1 is a material that determines the brightness, contrast, color, and viewing angle of the display device. Specifically, the power supply 50 provides a required voltage value for the display panel 1, and the power supply overvoltage protection device 2 closes the first electronic switch 20 when detecting that the output voltage is higher than the first threshold voltage, and controls the power supply 50 to reduce the output voltage when further detecting that the charging voltage of the capacitor 30 is higher than the second threshold voltage, so as to prevent the power supply 50 from being damaged due to the voltage increase, even the display panel 1 from being damaged.
The display device provided by the embodiment of the invention can effectively eliminate the voltage rise caused by external noise signals or loads, if the output voltage fluctuates for a short time, the charging voltage of the capacitor 30 cannot reach the second threshold voltage, and at this time, the current power supply state of the power supply 50 is still maintained. Only when the charging voltage of the capacitor 30 is higher than the second threshold voltage, the power supply 50 is controlled to reduce the power supply voltage, thereby ensuring the stability and reliability of the display panel 1.
In one embodiment, the display panel 1 includes a plurality of pixel electrodes, and the output terminals of the power supply 50 are respectively connected to the pixel electrodes. The output end of the power supply 50 is connected to each pixel electrode to provide different pixel voltages for each pixel electrode, so as to drive the sub-pixels corresponding to each pixel electrode to display different brightness, thereby realizing image display.
In one embodiment, the display panel 1 includes a plurality of sub-pixels arranged in an array, a scan line disposed along a first direction, and a plurality of data lines disposed along a direction perpendicular to the scan line; the sub-pixel comprises an active array switch, liquid crystal and a common electrode; the drain electrode of each active array switch is connected with the corresponding data line, the grid electrode of each active array switch is connected with the corresponding scanning line, the source electrode of each active array switch is connected with one end of the liquid crystal, and the other end of the liquid crystal is connected with the common electrode.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The overvoltage protection device for the power supply is characterized by comprising an output voltage comparison module, a first electronic switch, a capacitor and a power supply control module;
the first end of the output voltage comparison module is used for being connected with the output end of a power supply, the second end of the output voltage comparison module is connected with the first pole of the first electronic switch, and the output voltage comparison module is used for controlling the on-off state of the first electronic switch according to the comparison result of the output voltage of the power supply and the first threshold voltage;
the second pole of the first electronic switch is used for connecting the output end of the power supply, and the third pole of the first electronic switch is connected with the first pin of the capacitor; the second pin of the capacitor is grounded; the first electronic switch is a switch controlled by an electric signal;
the first end of the power supply control module is connected with the first pin of the capacitor, the second end of the power supply control module is used for being connected with the control end of the power supply, and the power supply control module is used for controlling the power supply state of the power supply according to the comparison result of the charging voltage of the capacitor and the second threshold voltage.
2. The power supply overvoltage protection device according to claim 1, wherein the output voltage comparison module comprises a first voltage sensor and a first voltage comparator;
the input end of the first voltage sensor is used for being connected with the output end of the power supply, and the output end of the first voltage sensor is connected with the input voltage end of the first voltage comparator;
the reference voltage end of the first voltage comparator is used for accessing the first threshold voltage;
the output end of the first voltage comparator is connected with the first pole of the first electronic switch.
3. The power supply overvoltage protection device according to claim 2, wherein the output voltage comparison module further comprises a first transformer, an input terminal of the first transformer is connected to the output terminal of the first voltage comparator, and an output terminal of the first transformer is connected to the first pole of the first electronic switch.
4. The power supply overvoltage protection device according to any one of claims 1 to 3, wherein the power supply control module comprises a second voltage sensor and a second voltage comparator;
the input end of the second voltage sensor is connected with the first pin of the capacitor, and the output end of the second voltage sensor is connected with the input voltage end of the second voltage comparator;
the reference voltage end of the second voltage comparator is used for accessing the second threshold voltage;
and the output end of the second voltage comparator is used for being connected with the control end of the power supply.
5. The power supply overvoltage protection device according to claim 4, wherein the power supply control module further comprises a second transformer, an input end of the second transformer is connected to the output end of the second voltage comparator, and an output end of the second transformer is used for being connected to the control end of the power supply.
6. The overvoltage protection device for a power supply according to claim 5, wherein the first electronic switch is a first field effect transistor, a gate of the first field effect transistor is connected to the second terminal of the output voltage comparison module, a drain of the first field effect transistor is connected to the output terminal of the power supply, and a source of the first field effect transistor is connected to the first pin of the capacitor.
7. The power supply overvoltage protection device according to claim 5 or 6, wherein the power supply comprises a second electronic switch, the output end of the second transformer is used for connecting a first pole of the second electronic switch, the first end of the output voltage comparison module is used for connecting a second pole of the second electronic switch, and a third pole of the second electronic switch is used for connecting an external power supply.
8. A display device, comprising a display panel, a power supply and the power supply overvoltage protection device as claimed in any one of claims 1 to 7, wherein an output terminal of the power supply is connected to the display panel for providing an operating power supply to the display panel;
the first end of the output voltage comparison module is connected with the output end of the power supply, and the second end of the output voltage comparison module is connected with the first pole of the first electronic switch;
the second pole of the first electronic switch is connected with the output end of the power supply, and the third pole of the first electronic switch is connected with the first pin of the capacitor; the second pin of the capacitor is grounded; the first electronic switch is a switch controlled by an electric signal;
and the first end of the power supply control module is connected with the first pin of the capacitor, and the second end of the power supply control module is connected with the control end of the power supply.
9. The display device according to claim 8, wherein the display panel includes a plurality of pixel electrodes, and the output terminal of the power supply is connected to each of the pixel electrodes.
10. The display device according to claim 8, wherein the display panel comprises a plurality of sub-pixels arranged in an array, a scan line arranged in a first direction, and a plurality of data lines arranged in a direction perpendicular to the scan line; the sub-pixels comprise active array switches, liquid crystals and common electrodes;
the drain electrode of each active array switch is connected with a corresponding data line, the grid electrode of each active array switch is connected with a corresponding scanning line, the source electrode of each active array switch is connected with one end of liquid crystal, and the other end of the liquid crystal is connected with a common electrode.
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Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001157451A (en) * | 1999-11-26 | 2001-06-08 | Sony Corp | High-voltage output protection circuit |
| CN203906956U (en) * | 2014-07-01 | 2014-10-29 | 温州合力自动化仪表有限公司 | Electric actuator with function of overload protection |
| CN106991988B (en) * | 2017-05-17 | 2019-07-02 | 深圳市华星光电技术有限公司 | The over-current protection system and method for GOA circuit |
| CN107393491B (en) * | 2017-07-18 | 2018-08-14 | 深圳市华星光电半导体显示技术有限公司 | Clock signal output circuit and liquid crystal display device |
| CN108761936B (en) * | 2018-04-02 | 2020-06-30 | 深圳市华星光电半导体显示技术有限公司 | Vertical alignment type liquid crystal display |
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| CN109672146A (en) | 2019-04-23 |
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