CN116316504A - Protection circuit, device and liquid crystal display comprising ceramic discharge tube - Google Patents
Protection circuit, device and liquid crystal display comprising ceramic discharge tube Download PDFInfo
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- CN116316504A CN116316504A CN202310102655.9A CN202310102655A CN116316504A CN 116316504 A CN116316504 A CN 116316504A CN 202310102655 A CN202310102655 A CN 202310102655A CN 116316504 A CN116316504 A CN 116316504A
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- 239000000919 ceramic Substances 0.000 title claims abstract description 67
- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 29
- 239000003990 capacitor Substances 0.000 claims abstract description 66
- 230000005669 field effect Effects 0.000 claims description 56
- 238000001914 filtration Methods 0.000 claims description 7
- 230000001681 protective effect Effects 0.000 claims description 5
- 230000002829 reductive effect Effects 0.000 abstract description 21
- 230000000694 effects Effects 0.000 description 10
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- 238000010586 diagram Methods 0.000 description 6
- 101100489577 Solanum lycopersicum TFT10 gene Proteins 0.000 description 3
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- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 230000001939 inductive effect Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000008034 disappearance Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
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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
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/20—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for electronic equipment
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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
- H02H9/025—Current limitation using field effect transistors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
The embodiment of the application provides a protection circuit, device and LCD including ceramic discharge tube, is applied to LCD, LCD includes driving chip, liquid crystal capacitor Clc, first TFT, second TFT, third TFT and storage capacitor Cst, protection circuit includes: the reference voltage generation module and the protection module can inhibit surge current or surge voltage through the protection circuit, so that damage of the surge current or the surge voltage to components is reduced, and system performance is improved.
Description
Technical Field
The application relates to the technical field of liquid crystal displays, in particular to a protection circuit containing a ceramic discharge tube, a device and a liquid crystal display.
Background
With the development and progress of society, electronic products have a larger and larger proportion in our daily lives. Many electronic products are provided with a display screen, and information is displayed and the electronic products are operated through the liquid crystal display screen.
In the liquid crystal display, a voltage difference formed between a reference voltage and a gamma voltage is used for driving a liquid crystal capacitor, and the reference voltage is usually generated by being directly connected with a power supply voltage through a reference voltage generating module when the reference voltage is generated, and surge current or surge voltage and the like can be generated when the system is powered on or powered off due to inductive load in the system, so that components in the display screen are damaged, for example, the aging of the components is accelerated, the damage of the components is further caused when the components are serious, and the system performance is reduced. In the prior art, a method of conducting control by using a double-triode is generally adopted to conduct power-on surge protection, specifically, one triode is adopted to conduct control, and the other triode is adopted to control the control electrode of the triode with conducting control, so that the double-triode conducting control is realized by the voltage characteristics of a circuit and the like to conduct power-on surge protection, but because inductive components exist in the circuit, power-off surge can be generated, but the double-triode conducting control method generally does not have the function of protecting the power-off surge, so that components in a display screen can still be damaged by surge voltage or current, and the system performance is reduced.
Disclosure of Invention
The embodiment of the application provides a protection circuit, a device and a liquid crystal display containing a ceramic discharge tube, which can inhibit surge current or surge voltage through the protection circuit, so that damage of the surge current or the surge voltage to components is reduced, and system performance is improved.
A first aspect of the embodiments of the present application provides a protection circuit including a ceramic discharge tube, applied to a liquid crystal display, the liquid crystal display including a driving chip, a liquid crystal capacitor Clc, a first TFT, a second TFT, a third TFT, and a storage capacitor Cst, the protection circuit including: the reference voltage generating module, the protection module, the second ceramic discharge tube D2 and the first zener diode D3, wherein,
the data port of the driving chip is connected with the second end of the first TFT and the second end of the second TFT, the first end of the first TFT, the first end of the second TFT and the first end of the third TFT are connected, the third end of the second TFT is connected with the second end of the third TFT, the first end of the liquid crystal capacitor and the first end of the storage capacitor, the second end of the liquid crystal capacitor is grounded, and the second end of the storage capacitor is connected with the third end of the third TFT and the output port of the reference voltage generating module;
the power input end of the reference voltage generation module is connected with the first end of the protection module, and the second end of the protection module is connected with the power port;
the protection module comprises a first ceramic discharge tube D1, a first inductor L1, a first capacitor C1, a second capacitor C2, a first field effect tube Q1, a second field effect tube Q2, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6 and a seventh resistor R7, wherein,
the first inductor L1 and the sixth resistor R6 are connected in parallel between the power supply port and the first end of the ceramic discharge vessel D1,
the first end of the first ceramic discharge tube D1 is connected with the first end of the first resistor R1, the first end of the first field effect tube Q1, the first end of the second resistor R2 and the first end of the fourth resistor R4,
the second end of the ceramic discharge tube D1 is grounded through the seventh resistor R7, the second end of the first resistor R1 is connected with the second end of the first field effect tube Q1, the first end of the second capacitor C2 and the power input end of the reference voltage generating module,
the second end of the second resistor R2 is connected with the third end of the first field effect tube Q1 and the first end of the third resistor R3, the second end of the third resistor R3 is connected with the first end of the second field effect tube Q2,
the third end of the second field effect transistor Q2 is connected with the second end of the fourth resistor R4, the first end of the fifth resistor R5 and the first end of the first capacitor C1,
the second end of the fifth resistor R5 is connected to the second end of the first capacitor C1, the second end of the second field effect transistor Q2, and the second end of the second capacitor C2 and is grounded.
The first end of the second ceramic discharge tube D2 is connected with the second end of the second resistor R2 and the first end of the first zener diode D3, the second end of the second ceramic discharge tube D2 is grounded, and the second end of the first zener diode D3 is grounded.
In one possible implementation, the protection circuit further includes: a third field effect transistor Q3, an eighth resistor R8, a third capacitor C3 and a ninth resistor R9, wherein,
the first end of the third field effect tube Q3 is connected with the first end of the first ceramic discharge tube D1, the second end of the third field effect tube is connected with the first end Q3 of the third field effect tube through the eighth resistor, the third end of the third field effect tube is connected with the first end of the third capacitor C3 and the first end of the ninth resistor R9, the second end of the third capacitor C3 is grounded, and the second end of the ninth resistor R9 is grounded.
In one possible implementation, the first fet Q1 is a P-channel fet, and the second fet Q2 is an N-channel fet.
In one possible implementation manner, the protection circuit further includes a feedback module, a first end of the feedback module is connected to the output end of the reference voltage generating module, and a second end of the feedback module is connected to the feedback port of the driving chip.
In one possible implementation, the feedback module includes: the filtering submodule is connected with the feedback submodule in series, the filtering submodule comprises a tenth resistor R10 and a second inductor L2, the tenth resistor R10 is connected with the second inductor L2 in parallel, the feedback submodule comprises an eleventh resistor R11 and a fourth capacitor C4, and the eleventh resistor R11 and the fourth capacitor C4 are connected in series.
In one possible implementation, the protection circuit further includes: a third field effect transistor Q3, an eighth resistor R8, a third capacitor C3, a ninth resistor R9 and a twelfth resistor R12, wherein,
the first end of the third field effect transistor Q3 is connected to the first end of the first ceramic discharge tube D1, the second end of the third field effect transistor Q3 is connected to the first end of the seventh resistor R7 and the first end of the fifth resistor R5 through the eighth resistor R8, the third end of the third field effect transistor is connected to the first end of the third capacitor C3 and the first end of the ninth resistor R9, the second end of the third capacitor C3 is grounded, and the second end of the ninth resistor R9 is grounded.
A second aspect of embodiments of the present application provides a protection device comprising a ceramic discharge vessel, the protection device comprising a circuit board and a protection circuit comprising a ceramic discharge vessel as claimed in any of the first aspects.
A second aspect of the embodiments of the present application provides a liquid crystal display comprising a housing and a protective device comprising a ceramic discharge tube as described in the second aspect.
The implementation of the embodiment of the application has at least the following beneficial effects:
the second end of the protection module is connected with the power port through the power input end of the reference voltage generating module, the protection module comprises a first ceramic discharge tube D1, a first inductor L1, a first capacitor C1, a second capacitor C2, a first field effect transistor Q1, a second field effect transistor Q2, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6 and a seventh resistor R7, wherein the first inductor L1 and the sixth resistor R6 are connected in parallel between the power port and the first end of the ceramic discharge tube D1, the first end of the first ceramic discharge tube D1 is connected with the first end of the first resistor R1, the first end of the first field effect transistor Q1, the second end of the second resistor R2, the first resistor R4, the second end of the fourth resistor R1, the second end of the second ceramic discharge tube D1 is connected with the first end of the second resistor R2, the second end of the third resistor R1 is connected with the second end of the third resistor Q2, the third end of the third resistor Q2 is connected with the first end of the first resistor Q1, the second end of the second resistor Q2 is connected with the third end of the third resistor Q2, the third end of the third resistor Q2 is connected with the first end of the third resistor Q2, the third end of the third resistor Q2 is connected with the third end of the first end of the third resistor Q1, therefore, the first ceramic discharge tube D1 is conducted and the first resistor R1 is conducted during power-on to shunt, surge current input into the reference voltage generation module is reduced, meanwhile, due to the voltage division effect between the seventh resistor R7 and the resistor R1, surge voltage subsequently applied to the reference voltage generation module can be reduced, the influence of the surge current and the surge voltage on the reference voltage generation module is reduced, system performance is improved, meanwhile, when power-down surge voltage or current is generated, the second ceramic discharge tube D2 is conducted, the first zener diode D3 is conducted, the voltage at the connection point between the R3 and the R2 and the Q1 is sharply reduced, the Q1 is turned off, the surge voltage acts on the R1, the R1 consumes current, electric energy reaching the power input end of the reference voltage generation module is reduced, and loss caused by the surge voltage during power-off is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a reference voltage generating module according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a protection circuit including a ceramic discharge tube according to an embodiment of the present application;
FIG. 3 is a schematic diagram of another embodiment of a protection circuit including a ceramic discharge tube;
FIG. 4 is a schematic diagram of another embodiment of a protection circuit including a ceramic discharge tube;
fig. 5 is a schematic diagram of another protection circuit including a ceramic discharge tube according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
The terms first, second and the like in the description and in the claims of the present application and in the above-described figures, are used for distinguishing between different objects and not for describing a particular sequential order. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may include other steps or elements not listed or inherent to such process, method, article, or apparatus.
Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly understand that the embodiments described herein may be combined with other embodiments.
In order to better understand a protection circuit including a ceramic discharge tube provided in an embodiment of the present application, a reference voltage generating module in a liquid crystal display in the prior art will be described below. Fig. 1 shows a schematic structure of a reference voltage generating module, and as shown in fig. 1, the reference voltage generating module only divides voltage through one resistor to reduce the access voltage, so that the situation of how to reduce the surge current is not considered, and the performance of the system is reduced. And the protection circuit that contains ceramic discharge tube that this application provided can be through the mode that can switch on and first resistance R1 switches on when powering up first ceramic discharge tube D1 to reduce the surge current who inputs into the reference voltage and take place the module, simultaneously because the partial pressure effect between seventh resistance R7 and the resistance R1 also can reduce the follow-up surge voltage that acts on in the reference voltage and take place the module, thereby reduced surge current and surge voltage's influence to the reference voltage and taken place the module, promoted system performance.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a protection circuit including a ceramic discharge tube according to an embodiment of the present application. As shown in fig. 2, the protection circuit is applied to a liquid crystal display including a driving chip 40, a liquid crystal capacitor Clc, a first TFT10, a second TFT20, a third TFT30, and a storage capacitor Cst, and includes: the reference voltage generating module, the protection module, the second ceramic discharge tube D2 and the first zener diode D3, wherein,
the data port of the driving chip 40 is connected to the second end of the first TFT10 and the second end of the second TFT20, the first end of the first TFT10, the first end of the second TFT20 and the first end of the third TFT30 are connected, the third end of the second TFT20 is connected to the second end of the third TFT30, the first end of the liquid crystal capacitor and the first end of the storage capacitor, the second end of the liquid crystal capacitor is grounded, and the second end of the storage capacitor is connected to the third end of the third TFT30 and the output port of the reference voltage generating module;
the power input end of the reference voltage generation module is connected with the first end of the protection module, and the second end of the protection module is connected with the power port;
the protection module comprises a first ceramic discharge tube D1, a first inductor L1, a first capacitor C1, a second capacitor C2, a first field effect tube Q1, a second field effect tube Q2, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6 and a seventh resistor R7, wherein,
the first inductor L1 and the sixth resistor R6 are connected in parallel between the power supply port and the first end of the ceramic discharge vessel D1,
the first end of the first ceramic discharge tube D1 is connected with the first end of the first resistor R1, the first end of the first field effect tube Q1, the first end of the second resistor R2 and the first end of the fourth resistor R4,
the second end of the ceramic discharge tube D1 is grounded through the seventh resistor R7, the second end of the first resistor R1 is connected with the second end of the first field effect tube Q1, the first end of the second capacitor C2 and the power input end of the reference voltage generating module,
the second end of the second resistor R2 is connected with the third end of the first field effect tube Q1 and the first end of the third resistor R3, the second end of the third resistor R3 is connected with the first end of the second field effect tube Q2,
the third end of the second field effect transistor Q2 is connected with the second end of the fourth resistor R4, the first end of the fifth resistor R5 and the first end of the first capacitor C1,
the second end of the fifth resistor R5 is connected with the second end of the first capacitor C1, the second end of the second field effect transistor Q2 and the second end of the second capacitor C2 and grounded;
the first end of the second ceramic discharge tube D2 is connected with the second end of the second resistor R2 and the first end of the first zener diode D3, the second end of the second ceramic discharge tube D2 is grounded, and the second end of the first zener diode D3 is grounded.
The working principle of the protection circuit can be as follows:
in fig. 2, R1 is a power resistor, when Q1 is not turned on, the starting current is limited by R1, the first ceramic discharge tube D1 and the seventh resistor R7, and after the voltage is stabilized gradually, Q1 is turned on to normally supply power to the reference voltage generating module, and when Q1 is turned on, it is controlled to be turned on according to the voltage of the second end of R2, that is, the voltage at the two ends of R3. The method comprises the following steps:
and when the circuit is electrified, surge voltage is generated by the circuit at the moment of electrification, and the voltage is far higher than the voltage when the circuit normally operates, so that the first ceramic discharge tube D1 is conducted, the current flowing through the R1 is reduced by shunting through the seventh resistor R7, and the current flowing through the R1 can be controlled through the ratio between the R7 and the R1 at the moment so as to be in a normal current range, and the effect of inhibiting the surge current is achieved. Meanwhile, the first ceramic discharge tube D1 is conducted, so that the branch where the first ceramic discharge tube D1 is located is approximate to a short circuit, and the purpose of protecting devices of a reference voltage generation module in a system can be guaranteed when surge voltage occurs. Meanwhile, as the R1 is divided, the voltage received by the reference voltage generating module also tends to be stable, and the starting fluctuation time is reduced, so that the stability of the output voltage of the reference voltage generating module is improved, the voltage applied to the two ends of the liquid crystal capacitor Clc is more stable, the condition of uneven local brightness is reduced, and the display effect is improved.
A2, in the starting process, after the power supply signal is filtered, the first ceramic discharge tube D1 is turned off due to the disappearance of surge voltage, so that a branch of the first ceramic discharge tube D1 is turned off, and C1 is charged through R4. When the voltage across C1 reaches the control threshold of Q2, Q2 will turn on so that the voltage at the junction between R3 and R2 and Q1 decreases (when not turned on, the voltage is the supply voltage).
A3, after the circuit is stable, Q1 is conducted, and R1 is correspondingly short-circuited, so that power is supplied to the reference voltage generation module.
Since the above-mentioned first-stage protection circuit is only used for protecting the circuit from the surge formed by the first transistor Q1 and the second transistor Q2, when the circuit is turned off, the filter circuit is an inductive load, which causes a surge voltage to be generated, and the surge voltage also causes damage to the components, and if the same first-stage protection circuit is designed for protecting from the power-down surge, the protection circuit of the second stage (the protection circuit formed by the second ceramic discharge tube D2 and the first zener diode D3) is designed to have a poor protection effect due to the characteristics of the circuit structure, when the circuit is turned off (the power port is turned off), a short high voltage is maintained at the first end of the Q1 due to the surge voltage, the first end is connected with the R2, at this time, the second ceramic discharge tube D2 is turned on, the first zener diode D3 is turned on, the voltage at the connection point between the R3 and the R2 and the Q1 drops sharply, so that the Q1 is turned off, the surge voltage acts on the R1, the R1 consumes current, and the electric energy reaching the power input end of the reference voltage generating module is reduced, so that the loss caused by the surge voltage during turn-off is reduced.
In one possible implementation manner, as shown in fig. 3, to further enhance the protection of the circuit, if the foregoing protection branch fails, the protection effect on the circuit is reduced, so that a protection circuit of the third stage is designed, and specifically the protection circuit further includes: a third field effect transistor Q3, an eighth resistor R8, a third capacitor C3 and a ninth resistor R9, wherein,
the first end of the third field effect tube Q3 is connected with the first end of the first ceramic discharge tube D1, the second end of the third field effect tube is connected with the first end Q3 of the third field effect tube through the eighth resistor R8, the third end of the third field effect tube is connected with the first end of the third capacitor C3 and the first end of the ninth resistor R9, the second end of the third capacitor C3 is grounded, and the second end of the ninth resistor R9 is grounded.
When surge voltage occurs, the control end of the third field effect transistor Q3 is at a high potential, and the third field effect transistor Q3 is conducted, so that electric energy is rapidly discharged, and damage to subsequent components is reduced.
In one possible implementation, the first fet Q1 is a P-channel fet, and the second fet Q2 is an N-channel fet.
In one possible implementation manner, as shown in fig. 4, since the voltage fluctuation occurs at the reference voltage end and the ripple voltage occurs, the ripple voltage may cause a poor display effect and easily causes uneven brightness, so that the circuit may be further improved, and a feedback circuit is provided to enable the ripple voltage to be superimposed on the data signal of the display, so that the data signal and the reference signal both have the same ripple, thereby improving the display effect.
Therefore, the ripple voltage generated at the reference voltage can be superimposed on the data signal of the display through the feedback module, so that the data signal and the reference signal have the same ripple, and the display effect is improved.
In one possible implementation, the feedback module includes: the filtering submodule is connected with the feedback submodule in series, the filtering submodule comprises a tenth resistor R10 and a second inductor L2, the tenth resistor R10 is connected with the second inductor L2 in parallel, the feedback submodule comprises an eleventh resistor R11 and a fourth capacitor C4, and the eleventh resistor R11 and the fourth capacitor C4 are connected in series.
The filtering module is arranged in the feedback circuit, so that signals with high components can be filtered, and the follow-up display effect can be improved due to the fact that tiny flicker is easily caused by the signals with the high components.
In one possible implementation manner, as shown in fig. 5, since the power supply may be unstable, resulting in a long-time high voltage condition, which may cause a great burden to the subsequent load circuit, and may cause damage to the subsequent load circuit in serious conditions, the embodiment of the present application provides another protection circuit structure, specifically: the protection circuit further comprises a third field effect transistor Q3, an eighth resistor R8, a third capacitor C3, a ninth resistor R9 and a twelfth resistor R12, wherein,
the first end of the third field effect transistor Q3 is connected to the first end of the first ceramic discharge tube D1, the second end of the third field effect transistor Q3 is connected to the first end of the seventh resistor R7 and the first end of the fifth resistor R5 through the eighth resistor R8, the third end of the third field effect transistor is connected to the first end of the third capacitor C3 and the first end of the ninth resistor R9, the second end of the third capacitor C3 is grounded, and the second end of the ninth resistor R9 is grounded.
Therefore, when a power supply has a high voltage for a long time, the first ceramic discharge tube D1 can be conducted at the high voltage, so that the voltage applied to the two ends of the eighth resistor R8 is increased, the third triode Q3 is conducted, the circuit is rapidly discharged through paths of R12, Q3 and R9, the current passing through a subsequent load circuit is reduced, the circuit is protected, meanwhile, the first ceramic discharge tube D1 is conducted, the other path formed by the paths of D1 and R7 and the path formed by the paths of D1 and R5 can be rapidly discharged, the current of the rear couple Xu Fuzai circuit is further reduced, and the protection force is improved. And because C3 has the energy storage function, can make Q3 both ends voltage can rise, finally reduce the pressure differential at Q3 both ends, reduce the electric current, the charging process of C3 can satisfy the duration that the power lasts high voltage generally to after the voltage reduces, Q3 can not switch on, and when eighth resistance R8 both ends satisfy the control and switch on, thereby prevented to continue to discharge the condition of circuit, save the electric energy. In addition, when the voltage is high, the discharge can be performed through the paths of R2D2 and the paths of R2 and D3, so that the safety is further improved. Meanwhile, due to the light characteristic of the circuit structure, the liquid crystal display circuit can be well matched with the liquid crystal display circuit, and the practicability is improved.
Embodiments of the present application also provide a protection device comprising a ceramic discharge vessel, the protection device comprising a circuit board and a protection circuit comprising a ceramic discharge vessel as in any of the previous embodiments.
Embodiments of the present application also provide a liquid crystal display including a case and a protection device including a ceramic discharge tube as described in the previous embodiments.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.
In the several embodiments provided in this application, it should be understood that the disclosed apparatus may be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative, such as the division of the units, merely a logical function division, and there may be additional manners of dividing the actual implementation, such as multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, or may be in electrical or other forms.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
The foregoing has outlined rather broadly the more detailed description of embodiments of the present application, wherein specific examples are provided herein to illustrate the principles and embodiments of the present application, the above examples being provided solely to assist in the understanding of the methods of the present application and the core ideas thereof; meanwhile, as those skilled in the art will have modifications in the specific embodiments and application scope in accordance with the ideas of the present application, the present description should not be construed as limiting the present application in view of the above.
Claims (8)
1. A protection circuit including a ceramic discharge tube, which is applied to a liquid crystal display including a driving chip, a liquid crystal capacitor Cl c, a first TFT, a second T FT, a third TFT, and a storage capacitor Cs T, comprising: the reference voltage generating module, the protection module, the second ceramic discharge tube D2 and the first zener diode D3, wherein,
the data port of the driving chip is connected with the second end of the first TFT and the second end of the second TFT, the first end of the first T FT, the first end of the second TFT and the first end of the third TFT are connected, the third end of the second T FT is connected with the second end of the third TFT, the first end of the liquid crystal capacitor and the first end of the storage capacitor, the second end of the liquid crystal capacitor is grounded, and the second end of the storage capacitor is connected with the third end of the third TFT and the output port of the reference voltage generating module;
the power input end of the reference voltage generation module is connected with the first end of the protection module, and the second end of the protection module is connected with the power port;
the protection module comprises a first ceramic discharge tube D1, a first inductor L1, a first capacitor C1, a second capacitor C2, a first field effect tube Q1, a second field effect tube Q2, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6 and a seventh resistor R7, wherein,
the first inductor L1 and the sixth resistor R6 are connected in parallel between the power supply port and the first end of the ceramic discharge vessel D1,
the first end of the first ceramic discharge tube D1 is connected with the first end of the first resistor R1, the first end of the first field effect tube Q1, the first end of the second resistor R2 and the first end of the fourth resistor R4,
the second end of the ceramic discharge tube D1 is grounded through the seventh resistor R7, the second end of the first resistor R1 is connected with the second end of the first field effect tube Q1, the first end of the second capacitor C2 and the power input end of the reference voltage generating module,
the second end of the second resistor R2 is connected with the third end of the first field effect tube Q1 and the first end of the third resistor R3, the second end of the third resistor R3 is connected with the first end of the second field effect tube Q2,
the third end of the second field effect transistor Q2 is connected with the second end of the fourth resistor R4, the first end of the fifth resistor R5 and the first end of the first capacitor C1,
the second end of the fifth resistor R5 is connected with the second end of the first capacitor C1, the second end of the second field effect transistor Q2 and the second end of the second capacitor C2 and grounded;
the first end of the second ceramic discharge tube D2 is connected with the second end of the second resistor R2 and the first end of the first zener diode D3, the second end of the second ceramic discharge tube D2 is grounded, and the second end of the first zener diode D3 is grounded.
2. The protection circuit of claim 1, further comprising: a third field effect transistor Q3, an eighth resistor R8, a third capacitor C3 and a ninth resistor R9, wherein,
the first end of the third field effect tube Q3 is connected with the first end of the first ceramic discharge tube D1, the second end of the third field effect tube is connected with the first end Q3 of the third field effect tube through the eighth resistor, the third end of the third field effect tube is connected with the first end of the third capacitor C3 and the first end of the ninth resistor R9, the second end of the third capacitor C3 is grounded, and the second end of the ninth resistor R9 is grounded.
3. The protection circuit of claim 2, wherein the first fet Q1 is a P-channel fet and the second fet Q2 is an N-channel fet.
4. The protection circuit of claim 3, further comprising a feedback module, a first end of the feedback module being coupled to the output of the reference voltage generating module, and a second end of the feedback module being coupled to the feedback port of the driver chip.
5. The protection circuit of claim 4, wherein the feedback module comprises: the filtering submodule is connected with the feedback submodule in series, the filtering submodule comprises a tenth resistor R10 and a second inductor L2, the tenth resistor R10 is connected with the second inductor L2 in parallel, the feedback submodule comprises an eleventh resistor R11 and a fourth capacitor C4, and the eleventh resistor R11 and the fourth capacitor C4 are connected in series.
6. The protection circuit of claim 1, further comprising: a third field effect transistor Q3, an eighth resistor R8, a third capacitor C3, a ninth resistor R9 and a twelfth resistor R12, wherein,
the first end of the third field effect transistor Q3 is connected to the first end of the first ceramic discharge tube D1, the second end of the third field effect transistor Q3 is connected to the first end of the seventh resistor R7 and the first end of the fifth resistor R5 through the eighth resistor R8, the third end of the third field effect transistor is connected to the first end of the third capacitor C3 and the first end of the ninth resistor R9, the second end of the third capacitor C3 is grounded, and the second end of the ninth resistor R9 is grounded.
7. A protective device comprising a ceramic discharge vessel, characterized in that the protective device comprises a circuit board and a protective circuit comprising a ceramic discharge vessel as claimed in any of claims 1-6.
8. A liquid crystal display comprising a housing and the protective device comprising a ceramic discharge tube according to claim 7.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310102655.9A CN116316504B (en) | 2023-02-02 | 2023-02-02 | Protection circuit, device and liquid crystal display comprising ceramic discharge tube |
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| CN202310102655.9A CN116316504B (en) | 2023-02-02 | 2023-02-02 | Protection circuit, device and liquid crystal display comprising ceramic discharge tube |
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| CN116316504B (en) | 2023-11-17 |
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