CN202102693U - Selection circuit compatible with power supply voltage of different liquid crystal screens - Google Patents
Selection circuit compatible with power supply voltage of different liquid crystal screens Download PDFInfo
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- CN202102693U CN202102693U CN2011201608834U CN201120160883U CN202102693U CN 202102693 U CN202102693 U CN 202102693U CN 2011201608834 U CN2011201608834 U CN 2011201608834U CN 201120160883 U CN201120160883 U CN 201120160883U CN 202102693 U CN202102693 U CN 202102693U
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- liquid crystal
- crystal display
- power supply
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Abstract
The utility model discloses a selection circuit compatible with power supply voltage of different liquid crystal screens, which comprises a power supply circuit. A power input end of the power supply circuit is selectively connected with a first power supply interface or a second power supply interface by a selector switch, an output end of the power supply circuit is connected with a liquid crystal screen, a control end of the power supply circuit is connected with a GIPO (general purpose input and output) port of an MCU (micro-control unit) chip, the MCU chip is used for controlling the power supply circuit to switch on or switch off power voltage outputted to the liquid crystal screen, the first power supply interface comprises a 12V power input end and a first interface output end, the first interface output end is selectively connected with the selector switch, the second power supply interface comprises a 5V power input end, a 3.3V power input end and a second interface output end, and the second interface output end is selectively connected with the selector switch.
Description
Technical field
The utility model relates to audio frequency and video electronic product field, relates more specifically to the selection circuit of the different liquid crystal display supply voltages of a kind of compatibility.
Background technology
As everyone knows; The different model different size the supply voltage of liquid crystal display often different; Therefore the power supply circuit to the liquid crystal display power supply is to design to different liquid crystal displays in the prior art, and a kind of often power circuit can only be applicable to the liquid crystal display of voltage requirements of the same race, so versatility is low; Compatible different liquid crystal display supply voltage can't be satisfied, the demand of the actual use of client can not be satisfied.
Therefore, demand the selection circuit of the different liquid crystal display supply voltages of a kind of improved compatibility urgently, overcome above-mentioned defective.
The utility model content
The purpose of the utility model is to provide the selection circuit of the different liquid crystal display supply voltages of a kind of compatibility, can realize different supply voltages is exported to different liquid crystal displays, and circuit is simple; Simple to operate; Satisfy the demand of the actual use of client, and reduce cost, economize on resources.
To achieve these goals; The utility model provides the selection circuit of the different liquid crystal display supply voltages of a kind of compatibility; Comprise feed circuit, the power input of said feed circuit is selected to connect first power supply interface or second power supply interface through a SS, and output terminal is connected with liquid crystal display; Control end is connected to the GIPO mouth of a MCU chip; Said MCU chip is used to control feed circuit to the conducting of liquid crystal display output supply voltage with end, and said first power supply interface comprises the 12V power input and the first interface output terminal, and the said first interface output terminal is selected to be connected with said SS; Said second power supply interface comprises 5V power input, 3.3V power input and the second interface output terminal, and the said second interface output terminal is selected to be connected with said SS; When needs when said liquid crystal display provides 12V voltage; Said SS is connected said first power supply interface; And the 12V power input of said first power supply interface is connected with the first interface output terminal, thereby 12V voltage is exported to said liquid crystal display through feed circuit; When needs when said liquid crystal display provides 5V voltage; Said SS is connected said second power supply interface; And the 5V power input of said second power supply interface is connected with the second interface output terminal, thereby 5V voltage is exported to said liquid crystal display through feed circuit; When needs when said liquid crystal display provides 3.3V voltage; Said SS is connected said second power supply interface; And the 3.3V power input of said second power supply interface is connected with the second interface output terminal, thereby 3.3V voltage is exported to said liquid crystal display through feed circuit.
Preferably; Said feed circuit comprise metal-oxide-semiconductor and transistor; The base stage of said transistor is connected to the GIPO mouth of said MCU chip through one first resistance; Collector is connected to power input through one second resistance on the one hand, is connected to the grid of said metal-oxide-semiconductor on the other hand through one the 3rd resistance, grounded emitter; The source electrode of said metal-oxide-semiconductor connects said power input, and drain electrode connects power output end, and a parallelly connected electric capacity between the grid of metal-oxide-semiconductor, source electrode.
Preferably, said transistor is a negative-positive-negative transistor.
Preferably, said metal-oxide-semiconductor is the P-channel enhancement type metal-oxide-semiconductor.
Preferably, said metal-oxide-semiconductor can replace with the components and parts of the switch control functions done of triode or other types.
Preferably, comprise that also filtering circuit is connected between the drain electrode and said power output end of said metal-oxide-semiconductor.
Preferably, said filtering circuit comprises the filter capacitor and the capacitance electrode of two parallel connections, and the end after said filter capacitor and the capacitance electrode parallel connection is connected between the drain electrode and said power output end of metal-oxide-semiconductor, the equal ground connection of the other end.
Compared with prior art, the utility model provides the selection circuit of the different liquid crystal display supply voltages of a kind of compatibility, can realize different supply voltages is exported to different liquid crystal displays; Circuit is simple, and is simple to operate, satisfies the demand of the actual use of client; And the minimizing cost economizes on resources.
Through following description and combine accompanying drawing, it is more clear that the utility model will become, and these accompanying drawings are used to explain the embodiment of the utility model.
Description of drawings
In order to be illustrated more clearly in the technical scheme of the utility model embodiment; To do to introduce simply to the accompanying drawing of required use among the embodiment below; Obviously, the accompanying drawing in describing below only is some embodiment of the utility model, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the circuit theory diagrams of the selection circuit of the compatible different liquid crystal display supply voltages of the utility model.
Embodiment
To combine the accompanying drawing among the utility model embodiment below, the technical scheme among the embodiment is carried out clear, intactly description, obviously, described embodiment only is the utility model part embodiment, rather than whole embodiment.With reference now to accompanying drawing, describe the embodiment of the utility model, the similar elements label is represented similar elements in the accompanying drawing.The utility model provides the selection circuit of the different liquid crystal display supply voltages of a kind of compatibility, can realize different supply voltages is exported to different liquid crystal displays, and circuit is simple, and is simple to operate, satisfies the demand of the actual use of client, and reduces cost, economizes on resources.
Fig. 1 is the circuit theory diagrams of the selection circuit of the compatible different liquid crystal display supply voltages of the utility model.The selection circuit of the compatible different liquid crystal display supply voltages of the utility model is fitted and is comprised feed circuit 10; The power input VI of said feed circuit 10 selects to connect first power supply interface 21 or second power supply interface 22 through a SS K1; The power output end VO of said feed circuit 10 is used for connecting with different liquid crystal display 40; The power control terminal Control of said feed circuit 10 is connected to the GIPO mouth of a MCU chip 30; Said MCU chip 30 is used to control conducting and ends said feed circuit 10 to liquid crystal display 40 output supply voltages; Said first power supply interface 21 comprises the 12V power input and the first interface output terminal P1, and the said first interface output terminal P1 selects to be connected with said SS K1; Said second power supply interface 22 comprises 5V power input, 3.3V power input and the second interface output terminal P2, and the said second interface output terminal P2 selects to be connected with said SS K1.
Particularly; Said feed circuit comprise metal-oxide-semiconductor Q2 and transistor Q1; The base stage B of said transistor Q1 is connected to the GIPO mouth of said MCU chip 30 through one first resistance R 1, and the collector C of said transistor Q1 is connected to power supply input end VI through one second resistance R 2 on the one hand, is connected to the grid G of said metal-oxide-semiconductor Q2 on the other hand through one the 3rd resistance R 3; The emitter E ground connection of said transistor Q1; Wherein, said first resistance R 1 is used to protect the GIPO mouth of said MCU chip 30, prevents that said MCU chip output current is excessive and causes the GIPO mouth to damage; Second resistance R 2 is the pull-up resistor of said transistor Q1, makes crystal three utmost point Q1 can export high level and low level.
The source S of said metal-oxide-semiconductor Q2 connects said power input VI, and the drain D of metal-oxide-semiconductor Q2 connects power output end VO, and a parallelly connected capacitor C 1 between the grid G of metal-oxide-semiconductor Q2, source S; Like this; Arranging of capacitor C 1 and the 3rd resistance R 3 constituted the RC time delay network, because the existence of RC time delay network, when the electric current input of control signal and during driven MOS pipe Q2; The grid G voltage of metal-oxide-semiconductor Q2 slowly arrives its threshold value under the effect of capacitor C 1; The conducting electric current of metal-oxide-semiconductor is become greatly gradually, thereby avoided of the infringement of the electric current of surge, and then protected metal-oxide-semiconductor Q2 and prolonged its serviceable life metal-oxide-semiconductor Q2.
Said feed circuit 10 comprise that also filtering circuit is connected between the source electrode and said power input of said metal-oxide-semiconductor Q2.Said filtering circuit comprises the filter capacitor C2 and the capacitance electrode E1 of two parallel connections, and the end after said filter capacitor C2 and the capacitance electrode E1 parallel connection is connected between the drain D and said power output end VO of metal-oxide-semiconductor Q2, the equal ground connection of the other end.
When the GIPO of said MCU chip 30 mouth is output as high level; Said transistor Q1 conducting; Make the collector C of said transistor Q1 be output as low level; Thereby the grid G that makes said metal-oxide-semiconductor Q2 becomes low level and makes its source S-drain D conducting, makes electric current export to said liquid crystal display from power input VI input and through source S-drain D of metal-oxide-semiconductor Q2 from power output end VO, makes said liquid crystal display get the electrician and does; When the GIPO of said MCU chip 30 mouth is output as low level; Said transistor Q1 conducting; Make the collector C of said transistor Q1 be output as high level; Thereby the grid G that makes said metal-oxide-semiconductor Q2 becomes high level and its source S-drain D is ended, and makes electric current export to said liquid crystal display from power output end VO from power input VI input and through source S-drain D of metal-oxide-semiconductor Q2, thereby supplies power to liquid crystal display by said power supply power supply 10.
Preferably, said transistor Q1 is a negative-positive-negative transistor.
Preferably, said metal-oxide-semiconductor Q2 is the P-channel enhancement type metal-oxide-semiconductor.
Preferably, said metal-oxide-semiconductor Q2 can replace with the components and parts of the switch control functions done of triode or other types.
Below, the principle of work of the selection circuit of the compatible different liquid crystal display supply voltages of specific descriptions the utility model:
When needs when said liquid crystal display provides 12V voltage; GIPO mouth output high level with said MCU chip 30; And said SS K1 connected said first power supply interface 21; And the 12V power input of said first power supply interface 21 is connected with the first interface output terminal P1, thereby 12V voltage is exported to said liquid crystal display through source S-drain D of metal-oxide-semiconductor Q2 from power output end VO through said SS K1 and from the power input VI input back of said feed circuit 10;
When needs when said liquid crystal display provides 5V voltage; GIPO mouth output high level with said MCU chip 30; And said SS K1 connected said second power supply interface 22; And the 5V power input of said second power supply interface 22 is connected with the second interface output terminal P2, thereby 5V voltage is exported to said liquid crystal display through source S-drain D of metal-oxide-semiconductor Q2 from power output end VO through said SS K1 and from the power input VI input back of said feed circuit 10;
When needs when said liquid crystal display provides 3.3V voltage; GIPO mouth output high level with said MCU chip 30; And said SS K1 connected said second power supply interface 22; And the 3.3V power input of said second power supply interface 22 is connected with the second interface output terminal P2, thereby 3.3V voltage is exported to said liquid crystal display through source S-drain D of metal-oxide-semiconductor Q2 from power output end VO through said SS K1 and from the power input VI input back of said feed circuit 10.
More than combine most preferred embodiment that the utility model is described, but the utility model is not limited to the embodiment of above announcement, and should contains various modification, equivalent combinations of carrying out according to the essence of the utility model.
Claims (7)
1. the selection circuit of the different liquid crystal display supply voltages of compatibility; It is characterized in that comprising feed circuit; The power input of said feed circuit selects to connect first power supply interface or second power supply interface through a SS; Output terminal is connected with liquid crystal display, and control end is connected to the GIPO mouth of a MCU chip, and said MCU chip is used to control conducting or ends said feed circuit to the liquid crystal display output supply voltage; Said first power supply interface comprises the 12V power input and the first interface output terminal, and the said first interface output terminal is selected to be connected with said SS; Said second power supply interface comprises 5V power input, 3.3V power input and the second interface output terminal, and the said second interface output terminal is selected to be connected with said SS;
When needs when said liquid crystal display provides 12V voltage; Said SS is connected said first power supply interface; And the 12V power input of said first power supply interface is connected with the first interface output terminal, thereby 12V voltage is exported to said liquid crystal display through feed circuit;
When needs when said liquid crystal display provides 5V voltage; Said SS is connected said second power supply interface; And the 5V power input of said second power supply interface is connected with the second interface output terminal, thereby 5V voltage is exported to said liquid crystal display through feed circuit;
When needs when said liquid crystal display provides 3.3V voltage; Said SS is connected said second power supply interface; And the 3.3V power input of said second power supply interface is connected with the second interface output terminal, thereby 3.3V voltage is exported to said liquid crystal display through feed circuit.
2. the selection circuit of the different liquid crystal display supply voltages of compatibility as claimed in claim 1; It is characterized in that; Said feed circuit comprise metal-oxide-semiconductor and transistor, and the base stage of said transistor is connected to the GIPO mouth of said MCU chip through one first resistance, and collector is connected to power input through one second resistance on the one hand; Be connected to the grid of said metal-oxide-semiconductor on the other hand through one the 3rd resistance, grounded emitter; The source electrode of said metal-oxide-semiconductor connects said power input, and drain electrode connects power output end, and a parallelly connected electric capacity between the grid of metal-oxide-semiconductor, source electrode.
3. the selection circuit of the different liquid crystal display supply voltages of compatibility as claimed in claim 2 is characterized in that said transistor is a negative-positive-negative transistor.
4. the selection circuit of the different liquid crystal display supply voltages of compatibility as claimed in claim 2 is characterized in that said metal-oxide-semiconductor is the P-channel enhancement type metal-oxide-semiconductor.
5. the selection circuit of the different liquid crystal display supply voltages of compatibility as claimed in claim 2 is characterized in that, said metal-oxide-semiconductor can replace with the components and parts of the switch control functions done of triode or other types.
6. the selection circuit of the different liquid crystal display supply voltages of compatibility as claimed in claim 2 is characterized in that, comprises that also filtering circuit is connected between the drain electrode and said power output end of said metal-oxide-semiconductor.
7. the selection circuit of the different liquid crystal display supply voltages of compatibility as claimed in claim 6; It is characterized in that; Said filtering circuit comprises the filter capacitor and the capacitance electrode of two parallel connections; End after said filter capacitor and the capacitance electrode parallel connection is connected between the drain electrode and said power output end of metal-oxide-semiconductor, the equal ground connection of the other end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201608834U CN202102693U (en) | 2011-05-19 | 2011-05-19 | Selection circuit compatible with power supply voltage of different liquid crystal screens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201608834U CN202102693U (en) | 2011-05-19 | 2011-05-19 | Selection circuit compatible with power supply voltage of different liquid crystal screens |
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| Publication Number | Publication Date |
|---|---|
| CN202102693U true CN202102693U (en) | 2012-01-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201608834U Expired - Lifetime CN202102693U (en) | 2011-05-19 | 2011-05-19 | Selection circuit compatible with power supply voltage of different liquid crystal screens |
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| CN (1) | CN202102693U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103825631A (en) * | 2014-02-28 | 2014-05-28 | 江苏智联天地科技有限公司 | Power supplying dynamic power supply adaption method for external device |
| CN106878814A (en) * | 2017-03-22 | 2017-06-20 | 四川长虹电器股份有限公司 | The system and method for compatible LCD TV standard screen and Tconless screens |
| CN107343213A (en) * | 2017-08-15 | 2017-11-10 | 四川长虹电器股份有限公司 | A kind of method of compatible tconless screens and standard screen |
| CN116578176A (en) * | 2023-04-27 | 2023-08-11 | 珠海妙存科技有限公司 | Power supply circuit, implementation method, implementation device and storage medium thereof |
-
2011
- 2011-05-19 CN CN2011201608834U patent/CN202102693U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103825631A (en) * | 2014-02-28 | 2014-05-28 | 江苏智联天地科技有限公司 | Power supplying dynamic power supply adaption method for external device |
| CN103825631B (en) * | 2014-02-28 | 2016-06-01 | 江苏智联天地科技有限公司 | A kind of external equipment is powered dynamic power supplies adaptation method |
| CN106878814A (en) * | 2017-03-22 | 2017-06-20 | 四川长虹电器股份有限公司 | The system and method for compatible LCD TV standard screen and Tconless screens |
| CN107343213A (en) * | 2017-08-15 | 2017-11-10 | 四川长虹电器股份有限公司 | A kind of method of compatible tconless screens and standard screen |
| CN116578176A (en) * | 2023-04-27 | 2023-08-11 | 珠海妙存科技有限公司 | Power supply circuit, implementation method, implementation device and storage medium thereof |
| CN116578176B (en) * | 2023-04-27 | 2023-11-14 | 珠海妙存科技有限公司 | Power supply circuit, implementation method, implementation device and storage medium thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: GUANGZHOU SHIYUAN ELECTRONIC TECHNOLOGY CO., LTD. Free format text: FORMER NAME: GUANGZHOU SHIYUAN ELECTRONICS TECHNOLOGY CO., LTD. |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 510663 Guangdong city of Guangzhou province Guangzhou Science City Kezhu Road No. 192 Patentee after: Guangzhou CVT Electronics Technology Co., Ltd. Address before: 510663 Guangdong city of Guangzhou province Guangzhou Science City Kezhu Road No. 192 Patentee before: Guangzhou Shiyuan Electronics Technology Co., Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120104 |