CN214507231U - VGA video switching circuit with five-path input and two-path output - Google Patents
VGA video switching circuit with five-path input and two-path output Download PDFInfo
- Publication number
- CN214507231U CN214507231U CN202120653811.7U CN202120653811U CN214507231U CN 214507231 U CN214507231 U CN 214507231U CN 202120653811 U CN202120653811 U CN 202120653811U CN 214507231 U CN214507231 U CN 214507231U
- Authority
- CN
- China
- Prior art keywords
- output
- vga video
- chip
- resistor
- rgb
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The utility model discloses a VGA video switching circuit of two way outputs of five way inputs, this circuit specifically is: the five VGA video input circuits are connected with the five VGA video signal sources; the RGB signal switching circuit is connected with RGB signals output by the five-path VGA video input circuit; the control signal of the HV signal switching and video switching control circuit is connected with the RGB signal switching circuit; the two VGA video output circuits are connected with HV signals output by the HV signal switching and video switching control circuit; the two VGA video output circuits are connected with the RGB signals output by the RGB signal switching circuit. The invention can realize that five VGA video signal sources select two VGA video signal sources according to the use requirements of users, namely, any two VGA videos are input into the display equipment from five VGA videos, thereby realizing that more information is displayed and the volume of the display equipment is greatly reduced.
Description
Technical Field
The utility model belongs to VGA video switching circuit field, in particular to VGA video switching circuit of two way outputs of five way inputs.
Background
With the continuous development of information technology, especially the development of sensor technology, the amount of information obtained is increasing, so that the information required to be displayed is increasing, and the requirement of adopting a plurality of displays to display more information is high. However, too many displays will cause the problems of large size, increased cost, poor man-machine efficiency, etc. The current video switching scheme has fewer video source input paths, only has two or three input paths, and is difficult to meet the requirement of displaying a large amount of information. In addition, most of the current video switching schemes employ a large scale integrated circuit as a switching chip (e.g., DSP), which is expensive, high in power consumption, difficult to produce, high in maintenance cost, and so on, and thus is difficult to be commonly used.
The video switching technology provides a solution for a display mode, namely, a data source needing to be displayed is switched in real time according to the importance degree of data and the requirements of users. Therefore, the multi-channel information source is selectively displayed according to the use requirements of users, and the size of the display equipment can be greatly reduced while more information is displayed. In addition, a special analog switching chip is adopted, so that the cost is greatly reduced, and the popularization of products is facilitated.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a VGA video switching circuit of two way outputs of five ways inputs, this circuit can realize selecting two way VGA video signal sources with five ways VGA video signal sources according to user's user demand, in following five ways VGA videos promptly, during arbitrary two way VGA video inputs display device, reduce display device's volume greatly when realizing showing more information.
Realize the utility model discloses the technical solution of purpose does: a VGA video switching circuit with five-path input and two-path output comprises a five-path VGA video input circuit, an RGB signal switching circuit, an HV signal switching and video switching control circuit and two-path VGA video output circuits; the five VGA video input circuits are connected with five VGA video signal sources; the RGB signal switching circuit is connected with RGB signals output by the five-path VGA video input circuit; the control signal of the HV signal switching and video switching control circuit is connected with the RGB signal switching circuit; the two VGA video output circuits are connected with HV signals output by the HV signal switching and video switching control circuit; the two VGA video output circuits are connected with the RGB signals output by the RGB signal switching circuit.
Compared with the prior art, the utility model, it is showing the advantage and is: 1) the circuit adopts a special analog signal switching chip for analog signal switching and adopts a field programmable logic gate array for level signal switching, so that the asynchrony caused by switching can be eliminated; 2) the circuit stores the switching data every time through the storage chip, and can realize that the switching state is not lost when the power is off; 3) the circuit is characterized in that the VGA video input end and the VGA video output end are respectively connected with the protection chip in parallel, so that high-speed data is protected from being influenced by overshoot.
The present invention will be described in further detail with reference to the accompanying drawings.
Drawings
Fig. 1 is a schematic diagram of a VGA video switching circuit device with five inputs and two outputs according to an embodiment of the present invention.
Fig. 2 is a circuit diagram of a VGA video switching circuit with five inputs and two outputs according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
In one embodiment, in combination with fig. 1, a five-input two-output VGA video switching circuit is provided, which includes a five-input VGA video input circuit, an RGB signal switching circuit, an HV signal switching and video switching control circuit, and a two-output VGA video output circuit; the five VGA video input circuits are connected with five VGA video signal sources; the RGB signal switching circuit is connected with RGB signals output by the five-path VGA video input circuit; the control signal of the HV signal switching and video switching control circuit is connected with the RGB signal switching circuit; the two VGA video output circuits are connected with HV signals output by the HV signal switching and video switching control circuit; the two VGA video output circuits are connected with the RGB signals output by the RGB signal switching circuit.
Further, in one embodiment, in combination with fig. 2, each circuit of the five-way VGA video input circuit comprises: the first resistor, the second resistor, the third resistor and the NUP4202W1T2G protect the chip; an R signal output by one path of VGA video source is simultaneously connected with one end of a first resistor and an IO1 pin of the NUP4202W1T2G protection chip, and the other end of the first resistor is grounded; a G signal output by one path of VGA video source is simultaneously connected with one end of a second resistor and an IO2 pin of the NUP4202W1T2G protection chip, and the other end of the second resistor is grounded; a B signal output by one path of VGA video source is simultaneously connected with one end of a third resistor and an IO3 pin of the NUP4202W1T2G protection chip, and the other end of the third resistor is grounded; NUP4202W1T2G shields the VN pin of the chip to ground.
Further, in one embodiment, with reference to fig. 2, the RGB signal switching circuit includes an analog signal switching chip, and two sets of a fourth resistor, a fifth resistor, and a sixth resistor corresponding to RGB signals, respectively; five paths of RGB signals output by the five paths of VGA video input circuits are respectively connected to an analog signal input pin of the analog signal switching chip; the R signal in each path of RGB signals output by the analog signal switching chip is connected with one end of a fourth resistor, and the other end of the fourth resistor is used as the output end of the RGB signal switching circuit to output the R signal; g signals in each path of RGB signals output by the analog signal switching chip are connected with one end of a fifth resistor, and the other end of the fifth resistor is used as the output end of the RGB signal switching circuit to output the G signals; and B signals in each path of RGB signals output by the analog signal switching chip are connected with one end of a sixth resistor, and the other end of the sixth resistor is used as the output end of the RGB signal switching circuit to output the B signals.
Here, preferably, the model of the analog signal switching chip is AD 8111.
Here, it is preferable that the first to sixth resistors have a resistance value of 75 Ω.
Further, in one embodiment, with reference to fig. 2, the HV signal switching and video switching control circuit includes a first level shift chip, a field programmable gate array, a serial port chip, and a storage chip; the first level conversion chip converts the HV signal level amplitude output by the five-path VGA video input circuit into 3.3V and outputs the 3.3V signal to the field programmable logic gate array; the field programmable gate array receives and transmits switching control data information through a serial port chip; the field programmable gate array stores the latest switching data through a storage chip so as to realize that the switching state is not lost when the power is cut off every time; the field programmable gate array is connected with an analog signal switching chip in the RGB signal switching circuit to realize the switching of RGB signals; and the field programmable gate array outputs two paths of HV signals according to the switching control data information.
Preferably, the model of the level conversion chip is SN74LVC4245DB, the model of the field programmable gate array is EPM570T144I5, the model of the serial port chip is MAX3232, and the model of the storage chip is AT24C 08A.
Further, in one embodiment, with reference to fig. 2, the two VGA video output circuits include a second level shift chip, and a NUP4202W1T2G protection chip corresponding to each RGB signal; r signals in each path of RGB signals output by the RGB signal switching circuit are respectively connected with an IO1 pin of the NUP4202W1T2G protection chip and an R pin of a VGA video output end; g signals in each path of RGB signals output by the RGB signal switching circuit are respectively connected with an IO2 pin of the NUP4202W1T2G protection chip and a G pin of the VGA video output end; b signals in each path of RGB signals output by the RGB signal switching circuit are respectively connected with an IO3 pin of the NUP4202W1T2G protection chip and a B pin of the VGA video output end; the level amplitudes of the two paths of HV signals output by the HV signal switching and video switching control circuit are converted into 5V by the second level conversion chip and then are connected with the HV pin of the VGA video output end.
Here, the model of the second level shift chip is preferably SN74HC244 NSR.
The utility model discloses can realize selecting two way VGA video signal sources according to user's user demand with five way VGA video signal sources, in five way VGA videos are followed promptly, in arbitrary two way VGA video input display device, reduce display device's volume when realizing showing more information greatly.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (9)
1. A VGA video switching circuit with five-path input and two-path output is characterized by comprising a five-path VGA video input circuit, an RGB signal switching circuit, an HV signal switching and video switching control circuit and two-path VGA video output circuits; the five VGA video input circuits are connected with five VGA video signal sources; the RGB signal switching circuit is connected with RGB signals output by the five-path VGA video input circuit; the control signal of the HV signal switching and video switching control circuit is connected with the RGB signal switching circuit; the two VGA video output circuits are connected with HV signals output by the HV signal switching and video switching control circuit; the two VGA video output circuits are connected with the RGB signals output by the RGB signal switching circuit.
2. The five-input two-output VGA video switching circuit of claim 1, wherein each of the five VGA video input circuits comprises: the first resistor, the second resistor, the third resistor and the NUP4202W1T2G protect the chip; an R signal output by one path of VGA video source is simultaneously connected with one end of a first resistor and an IO1 pin of the NUP4202W1T2G protection chip, and the other end of the first resistor is grounded; a G signal output by one path of VGA video source is simultaneously connected with one end of a second resistor and an IO2 pin of the NUP4202W1T2G protection chip, and the other end of the second resistor is grounded; a B signal output by one path of VGA video source is simultaneously connected with one end of a third resistor and an IO3 pin of the NUP4202W1T2G protection chip, and the other end of the third resistor is grounded; NUP4202W1T2G chip protection VNThe pin is grounded.
3. The VGA video switching circuit with five-input and two-output according to claim 2, wherein the RGB signal switching circuit comprises an analog signal switching chip, and two groups of fourth resistor, fifth resistor and sixth resistor corresponding to RGB signals respectively; five paths of RGB signals output by the five paths of VGA video input circuits are respectively connected to an analog signal input pin of the analog signal switching chip; the R signal in each path of RGB signals output by the analog signal switching chip is connected with one end of a fourth resistor, and the other end of the fourth resistor is used as the output end of the RGB signal switching circuit to output the R signal; g signals in each path of RGB signals output by the analog signal switching chip are connected with one end of a fifth resistor, and the other end of the fifth resistor is used as the output end of the RGB signal switching circuit to output the G signals; and B signals in each path of RGB signals output by the analog signal switching chip are connected with one end of a sixth resistor, and the other end of the sixth resistor is used as the output end of the RGB signal switching circuit to output the B signals.
4. The five-input two-output VGA video switching circuit of claim 3, wherein the analog signal switching chip is AD8111 in type.
5. The VGA video switching circuit with five-input and two-output according to claim 4, wherein the resistances of the first resistor to the sixth resistor are 75 Ω.
6. The VGA video switching circuit with five-input and two-output according to claim 5, wherein the HV signal switching and video switching control circuit comprises a first level conversion chip, a field programmable gate array, a serial port chip and a storage chip; the first level conversion chip converts the HV signal level amplitude output by the five-path VGA video input circuit into 3.3V and outputs the 3.3V signal to the field programmable logic gate array; the field programmable gate array receives and transmits switching control data information through a serial port chip; the field programmable gate array stores the latest switching data through a storage chip so as to realize that the switching state is not lost when the power is cut off every time; the field programmable gate array is connected with an analog signal switching chip in the RGB signal switching circuit to realize the switching of RGB signals; and the field programmable gate array outputs two paths of HV signals according to the switching control data information.
7. The five-input two-output VGA video switching circuit of claim 6, wherein the model of the level shift chip is SN74LVC4245DB, the model of the field programmable gate array is EPM570T144I5, the model of the serial port chip is MAX3232, and the model of the storage chip is AT24C 08A.
8. The five-input two-output VGA video switching circuit of claim 7, wherein the two-way VGA video output circuit comprises a second level conversion chip, a NUP4202W1T2G protection chip corresponding to each RGB signal; r signals in each path of RGB signals output by the RGB signal switching circuit are respectively connected with an IO1 pin of the NUP4202W1T2G protection chip and an R pin of a VGA video output end; g signals in each path of RGB signals output by the RGB signal switching circuit are respectively connected with an IO2 pin of the NUP4202W1T2G protection chip and a G pin of the VGA video output end; b signals in each path of RGB signals output by the RGB signal switching circuit are respectively connected with an IO3 pin of the NUP4202W1T2G protection chip and a B pin of the VGA video output end; the level amplitudes of the two paths of HV signals output by the HV signal switching and video switching control circuit are converted into 5V by the second level conversion chip and then are connected with the HV pin of the VGA video output end.
9. The five-input two-output VGA video switching circuit of claim 8, wherein the type of the second level shift chip is SN74HC244 NSR.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120653811.7U CN214507231U (en) | 2021-03-31 | 2021-03-31 | VGA video switching circuit with five-path input and two-path output |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120653811.7U CN214507231U (en) | 2021-03-31 | 2021-03-31 | VGA video switching circuit with five-path input and two-path output |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214507231U true CN214507231U (en) | 2021-10-26 |
Family
ID=78201347
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120653811.7U Active CN214507231U (en) | 2021-03-31 | 2021-03-31 | VGA video switching circuit with five-path input and two-path output |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214507231U (en) |
-
2021
- 2021-03-31 CN CN202120653811.7U patent/CN214507231U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR102592849B1 (en) | Apparatus for generating touch driving signal and apparatus for driving touch comprising the same, display apparatus and method for driving thereof | |
| US20110175943A1 (en) | Gamma Voltage Output Circuit of Source Driver | |
| CN103456269B (en) | Shift register circuit | |
| CN101609719B (en) | Shift register of display device | |
| CN103761942B (en) | The numeral method of tool array display multiplexing algorithm and key control chip | |
| CN103000157B (en) | Programmable gamma circuit of drive system of liquid crystal display | |
| CN103198807A (en) | Display signal processing system and circuit board and liquid crystal display device | |
| CN113704157B (en) | System for controlling multipath reset signals with different levels based on bus | |
| CN214507231U (en) | VGA video switching circuit with five-path input and two-path output | |
| CN105118469A (en) | Scan driving circuit and liquid crystal display device with same | |
| US20180294811A1 (en) | Operational Amplifier, Driving Interface, Measurement and Control Device, Driving Circuit and Driver | |
| CN104143985A (en) | Digital-to-analog converter, programmable gamma correction buffer circuit and display device | |
| CN201229762Y (en) | Conjuncted digital tube device embedded with driving chip | |
| CN110737344B (en) | Touch display control circuit, control method and electronic equipment | |
| CN203661030U (en) | Electrical level switching circuit and circuit board having same | |
| US9172390B2 (en) | Driving voltage generator and digital to analog converter | |
| CN204270071U (en) | A kind of any wave generator based on cpld | |
| CN205120913U (en) | Chip pin configuration system | |
| CN101888239B (en) | Output buffer, source electrode driver and electronic system | |
| CN204652532U (en) | A kind of DVI vision signal can frequency reducing distributor | |
| CN207397672U (en) | Integrated led drive circuit structure and corresponding led display system | |
| CN103929160B (en) | Measuring instrument with clock driver circuit | |
| TWI523000B (en) | Gamma reference voltage generator and gamma voltage generator of display device | |
| CN201928246U (en) | Phase-control device for phase shifter | |
| CN203746396U (en) | Nixie tube display and key control chip with array type display multiplexing algorithm |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 222001 No.18 Shenghu Road, Lianyungang City, Jiangsu Province Patentee after: The 716th Research Institute of China Shipbuilding Corporation Address before: 222001 No.18 Shenghu Road, Lianyungang City, Jiangsu Province Patentee before: 716TH RESEARCH INSTITUTE OF CHINA SHIPBUILDING INDUSTRY Corp. |