CN114664269B - Working power supply conversion circuit, display driving plate and liquid crystal display - Google Patents
Working power supply conversion circuit, display driving plate and liquid crystal display Download PDFInfo
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- CN114664269B CN114664269B CN202210426048.3A CN202210426048A CN114664269B CN 114664269 B CN114664269 B CN 114664269B CN 202210426048 A CN202210426048 A CN 202210426048A CN 114664269 B CN114664269 B CN 114664269B
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 112
- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 46
- 239000003990 capacitor Substances 0.000 claims description 20
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- 238000010586 diagram Methods 0.000 description 3
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- 230000000087 stabilizing effect Effects 0.000 description 2
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- 238000001914 filtration Methods 0.000 description 1
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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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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
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Abstract
The embodiment of the application provides a working power supply conversion circuit, a display driving plate and a liquid crystal display screen, a voltage selection module and a voltage conversion module, wherein the input end of the voltage selection module is connected with the input end of the working power supply conversion circuit, the first output end is connected with the output end of the working power supply conversion circuit, and the second output end is connected with the input end of the voltage conversion module; the output end of the voltage conversion module is connected with the output end of the working power supply conversion circuit; when the voltage value of the first voltage signal received by the input end of the voltage selection module is lower than a preset voltage threshold value, the first output end outputs the first voltage signal, otherwise, the second output end outputs the first voltage signal; when the input end of the voltage conversion module receives the first voltage signal, the first voltage signal is converted into a second voltage signal with a specified voltage value, and the second voltage signal is output, wherein the specified voltage value is smaller than the voltage value of the first voltage signal, so that the first voltage signal of misoperation is converted into the second voltage signal, and the damage of a liquid crystal product is reduced.
Description
Technical Field
The present disclosure relates to the field of electronic technologies, and in particular, to a working power conversion circuit, a display driving board, and a liquid crystal display.
Background
The liquid crystal display products currently in use mainly comprise two power inputs, one is a 12V power input system and the other is a 5V power input system.
In general, the input voltage value of the power input system is not directly marked on the lcd product, but is written in the specification of the product, and when the worker does not carefully read the specification, or simultaneously operate lcd products with different specifications, a power input error occurs. When a higher voltage is input to a liquid crystal display product with a low voltage value, the liquid crystal display product is directly burnt, for example, the rated voltage used by the liquid crystal display product is 5V power supply, the power supply of a worker is adjusted incorrectly, the product which should be input by the 5V power supply is wrongly operated into 12V power supply, and the damage to components and circuits on a C-PCB (side plate of a liquid crystal panel) and a TCON (screen driving plate in a liquid crystal display) can be caused, so that the liquid crystal display product is directly damaged.
Disclosure of Invention
An object of the embodiment of the application is to provide a working power supply conversion circuit, a display driving plate and a liquid crystal display screen, so that damage to liquid crystal display products is reduced. The specific technical scheme is as follows:
in a first aspect, an embodiment of the present application provides an operating power conversion circuit, including:
the device comprises a voltage selection module and a voltage conversion module, wherein the input end of the voltage selection module is connected with the input end of the working power supply conversion circuit, the first output end of the voltage selection module is connected with the output end of the working power supply conversion circuit, the second output end of the voltage selection module is connected with the input end of the voltage conversion module, and the output end of the voltage conversion module is connected with the output end of the working power supply conversion circuit;
the voltage selection module is configured to output the first voltage signal through a first output end of the voltage selection module when the voltage value of the first voltage signal received by the input end of the voltage selection module is lower than a preset voltage threshold value; outputting the first voltage signal through a second output end of the self under the condition that the voltage value of the first voltage signal received by the self input end is not lower than a preset voltage threshold value;
the voltage conversion module is configured to convert the first voltage signal into a second voltage signal with a specified voltage value under the condition that the input end of the voltage conversion module receives the first voltage signal, and output the second voltage signal through the output end of the voltage conversion module, wherein the specified voltage value is smaller than the voltage value of the first voltage signal.
In one possible implementation, the voltage selection module includes:
the voltage dividing device comprises a voltage dividing sub-module, a first switch sub-module and a second switch sub-module, wherein the input end of the voltage dividing sub-module is connected with the input end of the voltage selecting module, and the output end of the voltage dividing sub-module is connected with the control end of the first switch sub-module; the input end of the first switch sub-module is connected with the input end of the voltage selection module, and the output end of the first switch sub-module is respectively connected with the second output end of the voltage selection module and the control end of the second switch sub-module; the input end of the second switch sub-module is connected with the input end of the voltage selection module, and the output end of the second switch sub-module is connected with the first output end of the voltage selection module;
the voltage dividing submodule is configured to divide a first voltage signal received by the input end of the voltage selecting module into at least two voltage signals, wherein the at least two voltage signals comprise a third voltage signal; the third voltage signal is output to the control end of the first switch sub-module through the output end of the third switch sub-module;
the first switch sub-module is configured to be turned on when the voltage value of the third voltage signal received by the control end of the first switch sub-module is not lower than a preset starting voltage, and send the first voltage signal received by the input end of the first switch sub-module to the second output end of the voltage selection module and the control end of the second switch sub-module through the output end of the first switch sub-module; when the voltage value of the third voltage signal received by the self control terminal is lower than a preset starting voltage, the first switch submodule is disconnected;
the second switch submodule is arranged to be disconnected when the self control module receives the first voltage signal; and under the condition that the self control end does not receive the first voltage signal, the first switch sub-module is conducted, and the first voltage signal received by the self input end is sent to the first output end of the voltage selection module through the self output end.
In one possible implementation, the voltage dividing submodule includes a first resistor and a second resistor;
the first end of the first resistor is connected with the input end of the working power supply conversion circuit, and the second end of the first resistor is respectively connected with the first end of the second resistor and the control end of the first switch submodule;
the second end of the second resistor is grounded.
In one possible implementation manner, the first switch submodule includes a first MOS transistor, a first capacitor and a third resistor;
the grid electrode of the first MOS tube is respectively connected with the first end of the first capacitor and the output end of the voltage dividing submodule, the first end of the first MOS tube is connected with the input end of the working power supply conversion circuit, and the second end of the first MOS tube is respectively connected with the first end of the third resistor, the control end of the second switch submodule and the input end of the voltage conversion module;
the second end of the first capacitor is grounded;
the second end of the third resistor is grounded.
In one possible implementation manner, the second switch submodule includes a second MOS transistor and a second capacitor;
the grid electrode of the second MOS tube is connected with the second end of the second capacitor, the output end of the first switch sub-module and the control end of the second switch sub-module respectively, the first end of the second MOS tube is connected with the output end of the working power supply conversion circuit, and the second end of the second MOS tube is connected with the first end of the second capacitor and the input end of the working power supply conversion circuit respectively.
In one possible implementation manner, the first MOS transistor is an NMOS transistor, a first end of the first MOS transistor is a drain electrode of the NMOS transistor, and a second end of the first MOS transistor is a source electrode of the NMOS transistor.
In one possible implementation manner, the second MOS transistor is a PMOS transistor, the first end of the second MOS transistor is a drain of the PMOS transistor, and the second end of the second MOS transistor is a source of the PMOS transistor.
In one possible embodiment, the connection port of the voltage conversion module further includes a third terminal, and the third terminal of the voltage conversion module is grounded.
In one possible implementation, the voltage conversion module includes a buck circuit, which is a buck conversion circuit, for converting the first voltage signal to the second voltage signal.
In one possible embodiment, the voltage value of the first voltage signal is 5V or 12V; the voltage value of the second voltage signal is 5V.
In a second aspect, embodiments of the present application provide a display driving board, including:
an operating power conversion circuit as claimed in any one of the first aspects of the present application.
In a third aspect, embodiments of the present application provide a liquid crystal display, including:
the display driving panel as described in the second aspect of the present application.
The beneficial effects of the embodiment of the application are that:
the embodiment of the application provides a working power supply conversion circuit, a display drive board and a liquid crystal display, which comprises: the device comprises a voltage selection module and a voltage conversion module, wherein the input end of the voltage selection module is connected with the input end of the working power supply conversion circuit, the first output end of the voltage selection module is connected with the output end of the working power supply conversion circuit, the second output end of the voltage selection module is connected with the input end of the voltage conversion module, and the output end of the voltage conversion module is connected with the output end of the working power supply conversion circuit; the voltage selection module is configured to output the first voltage signal through a first output end of the voltage selection module when the voltage value of the first voltage signal received by the input end of the voltage selection module is lower than a preset voltage threshold value; outputting the first voltage signal through a second output end of the self under the condition that the voltage value of the first voltage signal received by the self input end is not lower than a preset voltage threshold value; the voltage conversion module is configured to convert the first voltage signal into a second voltage signal with a specified voltage value under the condition that the input end of the voltage conversion module receives the first voltage signal, and output the second voltage signal through the output end of the voltage conversion module, wherein the specified voltage value is smaller than the voltage value of the first voltage signal. The voltage selection module outputs a first voltage signal through a first output end of the voltage selection module when the voltage value of the first voltage signal received by the input end of the voltage selection module is a power input signal applicable to a liquid crystal display product; when the voltage value of the first voltage signal received by the input end of the self is a power input signal which is not applicable to the liquid crystal display product, the first voltage signal is output through the second output end of the self, and then the first voltage signal of misoperation is converted into a second voltage signal with a designated voltage value through the voltage conversion module to be output, and the second voltage signal is the power input signal which is applicable to the liquid crystal display product, so that the damage of the liquid crystal display product is reduced.
Of course, not all of the above-described advantages need be achieved simultaneously in practicing any one of the products or methods of the present application.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following description will briefly introduce the drawings that are required to be used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are only some embodiments of the present application, and other embodiments may also be obtained according to these drawings to those skilled in the art.
Fig. 1 is a first schematic diagram of an operating power conversion circuit according to an embodiment of the present application;
FIG. 2 is a second schematic diagram of the working power conversion circuit according to the embodiment of the present application;
fig. 3 is a third schematic diagram of an operating power conversion circuit 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. Based on the embodiments herein, a person of ordinary skill in the art would be able to obtain all other embodiments based on the disclosure herein, which are within the scope of the disclosure herein.
In order to reduce damage to a liquid crystal display product, an embodiment of the present application provides an operating power conversion circuit 1, see fig. 1, including:
the power supply control circuit comprises a voltage selection module 11 and a voltage conversion module 12, wherein the input end of the voltage selection module 11 is connected with the input end of the working power supply conversion circuit 1, the first output end of the voltage selection module 11 is connected with the output end of the working power supply conversion circuit 1, the second output end of the voltage selection module 11 is connected with the input end of the voltage conversion module 12, and the output end of the voltage conversion module 12 is connected with the output end of the working power supply conversion circuit 1;
the voltage selection module 11 is configured to output the first voltage signal through a first output terminal thereof under the condition that a voltage value of the first voltage signal received by an input terminal thereof is lower than a preset voltage threshold; outputting the first voltage signal through a second output end of the self under the condition that the voltage value of the first voltage signal received by the self input end is not lower than a preset voltage threshold value;
the voltage conversion module 12 is configured to convert the first voltage signal into a second voltage signal with a specified voltage value when the first voltage signal is received at an input end thereof, and output the second voltage signal through an output end thereof, wherein the specified voltage value is smaller than the voltage value of the first voltage signal.
The preset voltage threshold is larger than or equal to the rated working power supply of the liquid crystal display product, and the preset voltage threshold is lower than the damage voltage of the liquid crystal display product. The specific value of the preset voltage threshold is related to the design and the selection of the liquid crystal display product. For example, if the rated operating voltage of the lcd product is 5V and can operate between 5V and 7V, the preset voltage threshold may be set to a voltage value between 5V and 7V.
Under the condition that the voltage value of the first voltage signal received by the input end of the voltage selection module is lower than a preset voltage threshold value, the first voltage signal is considered to be a power input signal applicable to the liquid crystal display product, and the liquid crystal display product is not damaged. Under the condition that the voltage value of the first voltage signal received by the input end of the voltage selection module is not lower than a preset voltage threshold value, the first voltage signal is considered to damage the liquid crystal display product, and the first voltage signal is a power input signal which is not applicable to the liquid crystal display product.
In one example, the preset voltage threshold is 6V, and when the voltage value of the first voltage signal is 5V, the first voltage signal is output through the first output end of the voltage selection module under the condition that the voltage value of the first voltage signal is lower than the preset voltage threshold; when the voltage value of the first voltage signal is 12V, the first voltage signal is output through the second output end of the voltage selection module under the condition that the voltage value of the first voltage signal is not lower than a preset voltage threshold value.
The first voltage signal output by the second output end of the voltage selection module is converted into a second voltage signal with a specified voltage value through the voltage conversion module.
The voltage conversion module in the present application may be a buck circuit (buck conversion circuit) or an LDO (low dropout linear regulator) circuit, etc. for converting the first voltage signal into the second voltage signal with a specified voltage value. In practical application, buck circuit or LDO circuit can be selected according to load size, which are all within the protection scope of the application.
In the embodiment of the application, when the voltage value of the first voltage signal received by the voltage selection module is a power input signal applicable to a liquid crystal display product, the voltage selection module outputs the first voltage signal through a first output end of the voltage selection module; when the voltage value of the first voltage signal received by the input end of the self is a power input signal which is not applicable to the liquid crystal display product, the first voltage signal is output through the second output end of the self, and then the first voltage signal of misoperation is converted into a second voltage signal with a designated voltage value through the voltage conversion module to be output, and the second voltage signal is the power input signal which is applicable to the liquid crystal display product, so that the damage of the liquid crystal display product is reduced.
In one possible implementation, referring to fig. 2, the voltage selection module 11 includes:
the voltage division sub-module 111, the first switch sub-module 112 and the second switch sub-module 113, wherein an input end of the voltage division sub-module 111 is connected with an input end of the voltage selection module 11, and an output end of the voltage division sub-module 111 is connected with a control end of the first switch sub-module 112; the input end of the first switch sub-module 112 is connected with the input end of the voltage selection module 11, and the output end of the first switch sub-module 112 is respectively connected with the second output end of the voltage selection module 11 and the control end of the second switch sub-module 113; the input end of the second switch sub-module 113 is connected with the input end of the voltage selection module 11, and the output end of the second switch sub-module 113 is connected with the first output end of the voltage selection module 11;
the voltage dividing submodule 111 is configured to divide the first voltage signal received by the input end of the voltage selecting module 11 into at least two voltage signals, where the at least two voltage signals include a third voltage signal; and outputs the third voltage signal to the control end of the first switch sub-module 112 through the output end thereof;
the first switch sub-module 112 is configured to, when the voltage value of the third voltage signal received by the control terminal thereof is not lower than a preset starting voltage, turn on the first switch sub-module 112 and send the first voltage signal received by the input terminal thereof to the second output terminal of the voltage selecting module 11 and the control terminal of the second switch sub-module 113 through the output terminal thereof; when the voltage value of the third voltage signal received by the control terminal is lower than a preset starting voltage, the first switch sub-module 112 is disconnected;
the second switch sub-module 113 is configured to disconnect the first switch sub-module 112 when the self-control terminal receives the first voltage signal; in the case that the control terminal does not receive the first voltage signal, the first switch sub-module 112 is turned on, and sends, through the output terminal thereof, the first voltage signal received by the input terminal thereof to the first output terminal of the voltage selecting module 11.
The voltage conversion module 12 converts the first voltage signal into a second voltage signal with a specified voltage value when the first voltage signal is received by an input end of the voltage conversion module, and outputs the second voltage signal through an output end of the voltage conversion module, wherein the specified voltage value is smaller than the voltage value of the first voltage signal.
In the embodiment of the application, the voltage selection module consists of a voltage division sub-module, a first switch sub-module and a second switch sub-module, when the voltage value of a first voltage signal received by the input end of the voltage selection module is a power input signal applicable to a liquid crystal display product, the first switch sub-module is disconnected, the second switch sub-module is conducted, and the first voltage signal is output through the first output end of the voltage selection module; when the voltage value of the first voltage signal received by the input end of the voltage selection module is a power input signal which is not applicable to the liquid crystal display product, the first switch submodule is turned on, the second switch submodule is turned off, and the first voltage signal is output through the second output end of the voltage selection module. And selecting different output ends to output the first voltage signal according to whether the voltage value of the first voltage signal is a power input signal suitable for the liquid crystal display product or a power input signal not suitable for the liquid crystal display product, so as to realize the function of voltage selection.
In one possible embodiment, referring to fig. 3, the voltage dividing submodule 111 includes a first resistor R1 and a second resistor R2;
the first end of the first resistor R1 is connected with the input end VIN of the working power supply conversion circuit, and the second end of the first resistor R1 is connected with the first end of the second resistor R2 and the control end of the first switch sub-module 112 respectively;
the second end of the second resistor R2 is grounded.
The voltage division sub-module is used for dividing the voltage of the first voltage signal which is connected to the input end of the working power supply conversion circuit, and the calculation formula of the third voltage signal which is output by the output end of the voltage division sub-module is as follows: VIN { R2/(r1+r2) }, where VIN is the voltage input at the input terminal of the working power conversion circuit.
In one example, r1=100k, r2=249 k,
when VIN is 12V, substituting the third voltage signal calculation formula: 12V {100 k/(249k+100k) } = 3.44V;
when VIN is 5V, substituting the third voltage signal calculation formula: 5V {100 k/(249k+100k) } = 1.43V.
R1 and R2 are voltage dividing resistors, and are output to the control end of the first switch sub-module through a third voltage signal, and are used for providing bias voltage for the control end of the first switch sub-module, and the larger the impedance of R1 and R2 is, the smaller the leakage current of the first voltage signal to the ground is.
In the embodiment of the application, the voltage signal accessed to the input end of the working power supply conversion circuit is divided by the voltage dividing sub-module, and the output end of the voltage dividing sub-module is connected with the control end of the first switch sub-module, so that the control of the first switch sub-module is realized.
In one possible implementation, referring to fig. 3, the first switch sub-module 112 includes a first MOS transistor Q1, a first capacitor C1, and a third resistor R3; the grid electrode of the first MOS transistor Q1 is respectively connected with the first end of the first capacitor C1 and the output end of the voltage dividing submodule 111, the first end of the first MOS transistor Q1 is connected with the input end VIN of the working power supply conversion circuit, and the second end of the first MOS transistor Q1 is respectively connected with the first end of the third resistor R3, the control end of the second switch submodule 113 and the input end of the voltage conversion module 12;
the second end of the first capacitor C1 is grounded;
the second end of the third resistor R3 is grounded.
In one example, for any MOS tube in the circuit, the MOS tube can be an N-type MOS tube or a P-type MOS tube, and can be specifically selected according to actual conditions; the first end of the MOS tube is a source electrode or a drain electrode, and the second end of the MOS tube is a drain electrode or a source electrode corresponding to the first end. It can be understood that the MOS tube can be a P-type MOS tube or an N-type MOS tube, specifically can be selected according to practical situations, but the device connection mode of the corresponding adjusting circuit is needed, and the alternative scheme is still within the protection scope of the application.
In the embodiment of the application, the output end of the voltage dividing sub-module is used for controlling the first MOS tube in the first switch sub-module, and the switching action of the first MOS tube is used for realizing the voltage selecting function.
In one possible implementation manner, referring to fig. 3, the second switch submodule 113 includes a second MOS transistor Q2 and a second capacitor C2;
the grid electrode of the second MOS tube Q2 is connected with the second end of the second capacitor C2, the output end of the first switch sub-module 112 and the control end of the second switch sub-module 113 respectively, the first end of the second MOS tube Q2 is connected with the output end of the working power supply conversion circuit, and the second end of the second MOS tube Q2 is connected with the first end of the second capacitor C2 and the input end VIN of the working power supply conversion circuit respectively.
In one example, for any MOS tube in the circuit, the MOS tube can be an N-type MOS tube or a P-type MOS tube, and can be specifically selected according to actual conditions; the first end of the MOS tube is a source electrode or a drain electrode, and the second end of the MOS tube is a drain electrode or a source electrode corresponding to the first end. It can be understood that the MOS tube can be a P-type MOS tube or an N-type MOS tube, specifically can be selected according to practical situations, but the device connection mode of the corresponding adjusting circuit is needed, and the alternative scheme is still within the protection scope of the application.
In the embodiment of the application, the output end of the first switch sub-module is used for controlling the second MOS tube in the second switch sub-module, and the switching action of the second MOS tube is used for realizing the voltage selection function.
In one possible implementation manner, referring to fig. 3, the first MOS transistor Q1 is an NMOS transistor, the first end of the first MOS transistor Q1 is a drain electrode of the NMOS transistor, and the second end of the first MOS transistor Q1 is a source electrode of the NMOS transistor.
In one example, Q1 is an NMOS transistor, used as a selection switch, and Q1 is turned on when the first voltage signal is 12V; c1 is a filtering voltage stabilizing capacitor and provides a filtered stable voltage for Vgs (gate source voltage) of Q1; r3 is a current limiting resistor for limiting more current back to ground when Q1 is on.
In one possible implementation manner, referring to fig. 3, the second MOS transistor Q2 is a PMOS transistor, the first end of the second MOS transistor Q2 is a drain electrode of the PMOS transistor, and the second end of the second MOS transistor Q2 is a source electrode of the PMOS transistor.
In one example, Q2 is a PMOS transistor, used as a selection switch, and when the first voltage signal is 5V, Q2 is turned on; c2 is a filter voltage stabilizing capacitor, and provides a filtered stable voltage for Vgs of Q2.
In one possible embodiment, referring to fig. 3, the connection port of the voltage conversion module further includes a third terminal, and the third terminal of the voltage conversion module is grounded.
In one example, referring to fig. 3, U1 is a voltage conversion module, and the voltage conversion module may select an LDO circuit or a buck circuit according to a load size.
In one possible implementation, the voltage conversion module includes a buck circuit, which is a buck conversion circuit, for converting the first voltage signal to the second voltage signal.
In the embodiment of the application, the first voltage signal is converted into the second voltage signal by the voltage conversion module.
In one possible embodiment, the voltage value of the first voltage signal is 5V or 12V; the voltage value of the second voltage signal is 5V.
In one example, the operation of the operating power conversion circuit shown in fig. 3 is as follows:
when the input end of the working power supply conversion circuit is input with 12V, the voltage of the 12V is calculated to be 3.44V after the voltage is divided by R1 and R2, the voltage Vgs applied to the grid electrode of the Q1 is larger than the starting voltage Vth (the starting voltage is 3V) of the Q1, the Q1 is conducted, the Vds (drain source voltage) of the Q1 is 0V, the Vgs loaded to the Q2 is 0V, the Q2 is not conducted, the 12V voltage is input to U1, and the U1 is converted into 5V to be output, namely the output end of the working power supply conversion circuit outputs 5V voltage.
When the input end of the working power supply conversion circuit is input with 5V, the voltage of 5V is calculated to be 1.43V after the voltage is divided by R1 and R2, the voltage Vgs applied to the grid electrode of Q1 is smaller than the starting voltage Vth of Q1 (the starting voltage is 3V), Q1 is not conducted, vds of Q1 is 5V at the moment, vgs loaded to Q2 is-5V, the starting voltage (-3V) larger than Q2 is conducted, and the 5V voltage is normally input to the output end of the working power supply conversion circuit.
In one example, when the input voltage of the input end of the working power supply conversion circuit is 12V, the output end of the working power supply conversion circuit can output all voltages below 12V by adjusting the circuit parameters of the buck circuit in the voltage conversion module. In the embodiment of the application, when the voltage value of the first voltage signal is 5V, the output end of the working power supply conversion circuit outputs 5V voltage; when the voltage value of the first voltage signal is 12V, the voltage conversion module converts the voltage value of the first voltage signal into the voltage value of the second voltage signal of 5V, and the output end of the working power supply conversion circuit outputs 5V voltage, so that the liquid crystal display device is suitable for liquid crystal display products.
In the above embodiment, when the voltage value of the first voltage signal received by the input end of the voltage selection module is 5V of the power input signal applicable to the liquid crystal display product, the first MOS tube is turned off, the second MOS tube is turned on, and the first voltage signal is output through the first output end of the voltage selection module; when the voltage value of the first voltage signal received by the input end of the voltage selection module is 12V of a power input signal which is not applicable to the liquid crystal display product, the first MOS tube is conducted, the second MOS tube is disconnected, the first voltage signal 12V is output through the second output end of the voltage selection module, then the first voltage signal 12V which is misoperation is converted into the second voltage signal 5V to be output through the voltage conversion module, and the second voltage signal is 5V of the power input signal which is applicable to the liquid crystal display product, so that the damage of the liquid crystal display product is reduced.
The embodiment of the application also provides a display driving plate, which comprises: the operating power conversion circuit according to any one of the above.
The working power supply conversion circuit can be designed on the display driving board, the side board or the power supply switching board, and can be selected according to the space and the structure of the circuit board, and the working power supply conversion circuit is not particularly limited.
The embodiment of the application also provides a liquid crystal display, which comprises: such as the display driver board described above.
It can be understood that the working power supply conversion circuit can be applied to the field of liquid crystal display screens and can also be applied to power supply designs of products in other fields.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
In this specification, each embodiment is described in a related manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for system embodiments, since they are substantially similar to method embodiments, the description is relatively simple, as relevant to see a section of the description of method embodiments.
The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the scope of the present application. Any modifications, equivalent substitutions, improvements, etc. that are within the spirit and principles of the present application are intended to be included within the scope of the present application.
Claims (11)
1. An operating power conversion circuit, the circuit comprising:
the device comprises a voltage selection module and a voltage conversion module, wherein the input end of the voltage selection module is connected with the input end of the working power supply conversion circuit, the first output end of the voltage selection module is connected with the output end of the working power supply conversion circuit, the second output end of the voltage selection module is connected with the input end of the voltage conversion module, and the output end of the voltage conversion module is connected with the output end of the working power supply conversion circuit;
the voltage selection module is configured to output the first voltage signal through a first output end of the voltage selection module when the voltage value of the first voltage signal received by the input end of the voltage selection module is lower than a preset voltage threshold value; outputting the first voltage signal through a second output end of the self under the condition that the voltage value of the first voltage signal received by the self input end is not lower than a preset voltage threshold value;
the voltage conversion module is configured to convert the first voltage signal into a second voltage signal with a specified voltage value under the condition that the first voltage signal is received by the input end of the voltage conversion module, and output the second voltage signal through the output end of the voltage conversion module, wherein the specified voltage value is smaller than the voltage value of the first voltage signal;
the voltage selection module includes:
the voltage dividing device comprises a voltage dividing sub-module, a first switch sub-module and a second switch sub-module, wherein the input end of the voltage dividing sub-module is connected with the input end of the voltage selecting module, and the output end of the voltage dividing sub-module is connected with the control end of the first switch sub-module; the input end of the first switch sub-module is connected with the input end of the voltage selection module, and the output end of the first switch sub-module is respectively connected with the second output end of the voltage selection module and the control end of the second switch sub-module; the input end of the second switch sub-module is connected with the input end of the voltage selection module, and the output end of the second switch sub-module is connected with the first output end of the voltage selection module;
the voltage dividing submodule is configured to divide a first voltage signal received by the input end of the voltage selecting module into at least two voltage signals, wherein the at least two voltage signals comprise a third voltage signal; the third voltage signal is output to the control end of the first switch sub-module through the output end of the third switch sub-module;
the first switch sub-module is configured to be turned on when the voltage value of the third voltage signal received by the control end of the first switch sub-module is not lower than a preset starting voltage, and send the first voltage signal received by the input end of the first switch sub-module to the second output end of the voltage selection module and the control end of the second switch sub-module through the output end of the first switch sub-module; when the voltage value of the third voltage signal received by the self control terminal is lower than a preset starting voltage, the first switch submodule is disconnected;
the second switch submodule is arranged to be disconnected when the self control module receives the first voltage signal; and under the condition that the self control end does not receive the first voltage signal, the first switch sub-module is conducted, and the first voltage signal received by the self input end is sent to the first output end of the voltage selection module through the self output end.
2. The circuit of claim 1, wherein the voltage dividing submodule includes a first resistor, a second resistor;
the first end of the first resistor is connected with the input end of the working power supply conversion circuit, and the second end of the first resistor is respectively connected with the first end of the second resistor and the control end of the first switch submodule;
the second end of the second resistor is grounded.
3. The circuit of claim 1, wherein the first switch submodule comprises a first MOS transistor, a first capacitor, and a third resistor;
the grid electrode of the first MOS tube is respectively connected with the first end of the first capacitor and the output end of the voltage dividing submodule, the first end of the first MOS tube is connected with the input end of the working power supply conversion circuit, and the second end of the first MOS tube is respectively connected with the first end of the third resistor, the control end of the second switch submodule and the input end of the voltage conversion module;
the second end of the first capacitor is grounded;
the second end of the third resistor is grounded.
4. The circuit of claim 1, wherein the second switch sub-module comprises a second MOS transistor, a second capacitor;
the grid electrode of the second MOS tube is connected with the second end of the second capacitor, the output end of the first switch sub-module and the control end of the second switch sub-module respectively, the first end of the second MOS tube is connected with the output end of the working power supply conversion circuit, and the second end of the second MOS tube is connected with the first end of the second capacitor and the input end of the working power supply conversion circuit respectively.
5. The circuit of claim 3, wherein the first MOS transistor is an NMOS transistor, a first end of the first MOS transistor is a drain of the NMOS transistor, and a second end of the first MOS transistor is a source of the NMOS transistor.
6. The circuit of claim 4, wherein the second MOS transistor is a PMOS transistor, a first end of the second MOS transistor is a drain of the PMOS transistor, and a second end of the second MOS transistor is a source of the PMOS transistor.
7. The circuit of claim 1, wherein the connection port of the voltage conversion module further comprises a third terminal, the third terminal of the voltage conversion module being grounded.
8. The circuit of claim 1, wherein the voltage conversion module comprises a buck circuit, the buck circuit being a buck conversion circuit for converting the first voltage signal to the second voltage signal.
9. The circuit of claim 1, wherein the first voltage signal has a voltage value of 5V or 12V; the voltage value of the second voltage signal is 5V.
10. A display drive board, characterized in that the display drive board comprises:
an operating power conversion circuit according to any one of claims 1 to 9.
11. A liquid crystal display, the liquid crystal display comprising:
the display driving panel as claimed in claim 10.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210426048.3A CN114664269B (en) | 2022-04-21 | 2022-04-21 | Working power supply conversion circuit, display driving plate and liquid crystal display |
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| CN202210426048.3A CN114664269B (en) | 2022-04-21 | 2022-04-21 | Working power supply conversion circuit, display driving plate and liquid crystal display |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW200921597A (en) * | 2007-11-08 | 2009-05-16 | Chunghwa Picture Tubes Ltd | Display device and driving voltage compensation device for backlight module |
| CN102446480B (en) * | 2010-10-14 | 2015-04-01 | 上海天马微电子有限公司 | Voltage conversion circuit |
| CN102902336B (en) * | 2011-07-29 | 2015-08-26 | 联想(北京)有限公司 | The power supply link block of mainboard, mainboard and electronic equipment thereof |
| CN102290970B (en) * | 2011-08-08 | 2013-10-02 | 无锡中星微电子有限公司 | Mode selecting and controlling circuit in voltage converter |
| JP6382002B2 (en) * | 2014-07-11 | 2018-08-29 | ローム株式会社 | DC-DC converter |
| CN105788556B (en) * | 2016-05-20 | 2018-12-11 | 深圳市华星光电技术有限公司 | A kind of overvoltage crowbar and method, liquid crystal display drive circuit |
| CN110268466A (en) * | 2017-02-02 | 2019-09-20 | 堺显示器制品株式会社 | Voltage control circuit and display device |
| CN109410868B (en) * | 2018-12-06 | 2020-10-16 | 深圳市华星光电半导体显示技术有限公司 | Display panel driving device |
| CN213518193U (en) * | 2020-12-16 | 2021-06-22 | 苏州浪潮智能科技有限公司 | Power converter |
| CN215990568U (en) * | 2021-02-24 | 2022-03-08 | 广东高普达集团股份有限公司 | POE changes USB supply circuit and USB converter |
| CN114285273A (en) * | 2021-12-17 | 2022-04-05 | 上海艾为电子技术股份有限公司 | Power supply circuit and electronic equipment |
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Address after: 100015 No. 10, Jiuxianqiao Road, Beijing, Chaoyang District Applicant after: BOE TECHNOLOGY GROUP Co.,Ltd. Applicant after: Chengdu BOE Display Technology Co.,Ltd. Address before: 100015 No. 10, Jiuxianqiao Road, Beijing, Chaoyang District Applicant before: BOE TECHNOLOGY GROUP Co.,Ltd. Applicant before: CHENGDU ZHONGDIAN PANDA DISPLAY TECHNOLOGY Co.,Ltd. |
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