CN104424911A - VGA interface protection circuit - Google Patents
VGA interface protection circuit Download PDFInfo
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- CN104424911A CN104424911A CN201310376023.8A CN201310376023A CN104424911A CN 104424911 A CN104424911 A CN 104424911A CN 201310376023 A CN201310376023 A CN 201310376023A CN 104424911 A CN104424911 A CN 104424911A
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- 238000010586 diagram Methods 0.000 description 7
- 241001062009 Indigofera Species 0.000 description 5
- 230000003068 static effect Effects 0.000 description 4
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- 230000000694 effects Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
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Abstract
The invention discloses a video graphic array (VGA) interface protection circuit comprising a signal generating unit, a switching unit, a first power generating unit and a first video graphic array interface unit. The signal generating unit generates a signal related to a display image; the switching unit coupled with the signal generating unit is used for converting the signal related to a display image into a first displayable signal and generating a first trigger signal; the first power generating unit coupled to the switching unit is used for providing a first power signal according to the first trigger signal; and the first video graphic array interface unit coupled to the first power generating unit and the switching unit is used for receiving the first displayable signal and the first power signal to provide a display unit for displaying.
Description
Technical field
The invention relates to a kind of protection circuit, especially about a kind of video graphics array (VideoGraphic Array, VGA) interface protective circuit.
Background technology
Video graphics array (Video Graphic Array, VGA) interface unit is widely used in various electronic product, as display, host computer etc., is be used as to transmit color simulation signal to display.
Traditionally, USB interface unit has 15 branch connecting pins, at least comprise three branch connecting pins to be used for respectively receiving red (R) look simulating signal, indigo plant (B) look simulating signal and green (G) look simulating signal, another two branch connecting pins are used for receiving horizontal-drive signal and vertical synchronizing signal, and a branch connecting pin is used for receiving the VCC direct current signal driving external-connection displayer again.Generally speaking, this VCC direct current signal provided by the inner switch unit of main frame, and wherein this switch unit shows for external-connection displayer to send USB interface unit in order to change VGA signal.Under this framework, once external-connection displayer generation drain conditions, outside voltage will receive the pin feeding main frame inside of VCC direct current signal via USB interface unit, and then damage and the switch unit that couples of USB interface unit, because switch unit cannot reoffer VGA signal to USB interface unit, external-connection displayer can be caused to show.Therefore, a kind of novel circuit design avoiding above-mentioned condition to occur is needed.
Summary of the invention
In view of above-mentioned, the invention provides a kind of USB interface protection circuit, solve external voltage and import via USB interface unit pin the problem that elements breaking down is caused in main frame inside into.
An aspect of of the present present invention is providing a kind of video graphics array (VGA) interface protective circuit.This USB interface protection circuit comprises a signal generation unit, a switch unit, one first power supply generation unit and one first USB interface unit.Signal generation unit produces a signal relevant with show image.Switch unit couples signal generation unit, changes this signal relevant with show image into one first displayable signal, and produces one first trigger pip.Power supply generation unit couples switch unit, provides one first power supply signal according to the first trigger pip.First USB interface unit, couples the first power supply generation unit and switch unit, receives the first displayable signal and the first power supply signal shows to provide a display unit.
Another aspect of the present invention is providing a kind of video graphics array (VGA) interface protective circuit.This USB interface protection circuit, comprises a signal generation unit, a switch unit, one first power supply generation unit, a second source generation unit, one first USB interface unit and one second USB interface unit.Signal generation unit, in order to produce a signal relevant with show image and a control signal.Switch unit couples signal generation unit, in order to change the signal relevant with show image into one first displayable signal or one second displayable signal, and produces one first trigger pip or one second trigger pip according to control signal.First power supply generation unit couples switch unit, in order to provide the first power supply signal.Second source generation unit couples switch unit, in order to provide second source signal.First USB interface unit, couples the first power supply generation unit and switch unit.Second USB interface unit, couples second source generation unit and switch unit.Wherein when switch unit produces the first trigger pip, first power supply generation unit provides one first power supply signal to the first USB interface unit, this the first displayable signal is shown to make a display unit, and when switch unit produces this second trigger pip, second source generation unit provides a second source signal to the second USB interface unit, shows this second displayable signal to make a display unit.
In sum, the present invention provides direct current signal needed for USB interface unit by one independent of the power supply generation unit of switch unit, so as to avoiding outside burst voltage directly to damage switch unit via the direct current signal pin of USB interface unit, and external display unit still can normally be shown.
Accompanying drawing explanation
Figure 1 shows that USB interface protection circuit schematic diagram according to an embodiment of the invention;
Figure 2 shows that the schematic diagram of a USB interface unit according to an embodiment of the invention;
Fig. 3 A is depicted as USB interface unit according to an embodiment of the invention and couples the schematic diagram of wave filter;
Fig. 3 B is depicted as filter construction schematic diagram according to an embodiment of the invention.
Embodiment
Below described in detail with appended accompanying drawing for preferred embodiment of the present invention, following explanation and accompanying drawing use identical reference number to represent identical or like, and then give omission in repeated description during identical or like.
Figure 1 shows that USB interface protection circuit schematic diagram according to an embodiment of the invention.USB interface protection circuit 100 of the present invention comprises: signal generation unit 101, switch unit 102,1 first USB interface unit 103,1 first power supply generation unit 104,1 second USB interface unit 106 and a second source generation unit 107.Wherein, the first USB interface unit 103 and the second USB interface unit 106 can external display units (not showing).And signal generation unit 101 produces a control signal CN and the signal IS relevant with show image sends switch unit 102 to, wherein relevant with show image signal IS at least comprises red (R) look simulating signal, indigo plant (B) look simulating signal, green (G) look simulating signal, horizontal-drive signal, vertical synchronizing signal, enabling signal and DDC signal.Switch unit 102 couples signal generation unit 101, that selects signal generation unit 101 to produce according to control signal CN changes with show image relevant signals IS and exports the first displayable signal DS1 or the second displayable signal DS2 to, to send the first USB interface unit 103 or the second USB interface unit 106 to, be supplied to external display unit and show.In addition, output first displayable signal that switch unit 102 also detects according to inside or the second displayable signal produce one first trigger pip (EN1) or one second trigger pip (EN2), send the first power supply generation unit 104 or second source generation unit 107 to, to power to the first USB interface unit 103 or the second USB interface unit 106.That is, switch unit 102 can select the first USB interface unit 103 or the second USB interface unit 106 relevant displayable signal of a transmission wherein and power supply signal according to control signal CN.It should be noted that, in the present embodiment, to power respectively to two USB interface unit 103 and 106 for the selection of displayable signal and two power supply generation units 104 and 107 application of the present invention is described, right the present invention also can be applicable to the USB interface unit of other numbers, is not limited with two.Such as, in the embodiment of the only single USB interface unit of tool, only need to use single power supply generation unit, and switch unit 102 can directly signal generation unit 101 be produced carry out converting the displayable signal relevant with show image to show image relevant signals and send USB interface unit to.In addition, first power supply generation unit 104 and second source generation unit 107 are all independent of outside switch unit 102, and first trigger pip (EN1) that can produce according to switch unit 102 and the second trigger pip (EN2) export VCC direct current signal to the first USB interface unit 103 and the second USB interface unit 106, to drive external display unit.By all providing VCC direct current signal to the first USB interface unit 103 and the second USB interface unit 106 independent of the first power supply generation unit 104 outside switch unit 102 and second source generation unit 107, to drive external display unit, outside burst voltage can be avoided via the first USB interface unit 103 and the second USB interface unit 106, with the problem driving external display unit to damage switch unit 102.In one embodiment, signal generation unit 101 be the basic controller of a server in order to management control system, independent of other hardware components control of server I/O equipment, the exchanges data between I/O equipment and server can be realized.
Figure 2 shows that the schematic diagram of a USB interface unit according to an embodiment of the invention.Wherein, the first USB interface unit 103 and the second USB interface unit 106 all have 15 branch connecting pins.Wherein pin 1 is in order to receive red (R) look simulating signal; Pin 2 is in order to receive green (G) look simulating signal; Pin 3 is in order to receive indigo plant (B) look simulating signal; Pin 4 does not do and connects; Pin 5 ground connection; Pin 6 red (R) look simulating signal ground connection; Pin 7 green (G) look simulating signal ground connection; Pin 8 indigo plant (B) look simulating signal ground connection; Pin 9 is in order to receive VCC direct current signal; Pin 10 ground connection; Pin 11 does not do and connects; Pin 12 is in order to receive data-signal; Pin 13 is in order to receive horizontal-drive signal; Pin 14 is in order to receive vertical synchronizing signal; Pin 15 is in order to receive clock signal.Wherein, according to the present embodiment, the VCC direct current signal that pin 9 receives provided by power supply generation unit 104.And red (R) look simulating signal that pin 1 receives, green (G) look simulating signal that pin 2 receives, indigo plant (B) the look simulating signal that pin 3 receives, pin 12 received data signal, the horizontal-drive signal that pin 13 receives, the vertical synchronizing signal that pin 14 receives and the clock signal that pin 15 receives are all provided by switch unit 102.
According to this, under framework of the present invention, what the first USB interface unit 103 and the second USB interface unit 106 received is transmitted by switch unit 102 with show image relevant signals, and the VCC direct current signal that the first USB interface unit 103 and the second USB interface unit 106 receive is then provided independent of the first power supply generation unit 104 outside switch unit 102 and second source generation unit 107 by one respectively.Therefore, even if the external display unit generation drain conditions that the first USB interface unit 103 and the second USB interface unit 106 couple, the exsule voltage of this outside can't receive the pin damage switch unit 102 of VCC direct current signal via the first USB interface unit 103 and the second USB interface unit 106, and the first power supply generation unit 104 and second source generation unit 107 also have antijamming capability to this burst voltage, therefore, the signal relevant with show image that signal generation unit 101 produces still normally can be sent to the first corresponding USB interface unit 103 or the second USB interface unit 106 by switch unit 102, and external display unit still can normally be shown.
In addition, in another embodiment, cause damage because of static discharge (ESD) effect for avoiding the first USB interface unit 103 and the first power supply generation unit 104, therefore the present invention's more external electric capacity 105 between the first power supply generation unit 104 and the first USB interface unit 103, and place near the first USB interface unit 103.Wherein one end of electric capacity 105 is earthy using as ESD protection circuit, to provide the current path of static discharge in electrostatic discharge event, exsule electrostatic induced current is avoided to flow into the first power supply generation unit 104 and the first USB interface unit 103 and cause damage.Same, cause damage because of static discharge (ESD) effect for avoiding the second USB interface unit 106 and second source generation unit 107, therefore an also external electric capacity 108 between second source generation unit 107 and the second USB interface unit 106, and place near the second USB interface unit 106.Wherein one end of electric capacity 108 is earthy using as ESD protection circuit, to provide the current path of static discharge in electrostatic discharge event, exsule electrostatic induced current is avoided to flow into second source generation unit 107 and the second USB interface unit 106 and cause damage.
And in implementing one, as shown in Figure 3A, the present invention also can comprise multiple wave filter 108,109 and 110 and couple the first USB interface unit 103, carries out filtering to the simulating signal importing the first USB interface unit 103 into.Such as, wave filter 108 in order to carry out filtering to red analog signal, wave filter 109 in order to carry out filtering to green analog signal, wave filter 110 in order to carry out filtering to blue analog signals, with by the noise filtering in signal.It should be noted that the second USB interface unit 106 also can adopt same design, couple the second USB interface unit 106 by multiple wave filter, filtering is carried out to the simulating signal importing the second USB interface unit 106 into.Fig. 3 B is depicted as filter construction schematic diagram according to an embodiment of the invention, its median filter 108,109 and 110 can adopt identical filter circuit configuration, for wave filter 108, the two inductance type π type LC low-pass filters be made up of two inductance 1081 and 1082 and three electric capacity 1083,1084 and 1085.It should be noted that in this embodiment, wave filter 108,109 and 110 is arranged between the first USB interface unit 103 and switch unit 102, and near the first USB interface unit 103.
In sum, the present invention provides the direct current signal of the VCC needed for USB interface unit by one independent of the power supply generation unit of switch unit, directly switch unit is damaged via the VCC direct current signal pin of USB interface unit so as to avoiding outside burst voltage, in other words, framework switch unit still normally can send display to USB interface unit according to this, and external display unit still can normally be shown.
Although the present invention discloses as above with embodiment; so itself and be not used to limit the present invention; anyly be familiar with this those skilled in the art; without departing from the spirit and scope of the present invention; when being used for a variety of modifications and variations, the scope that therefore protection scope of the present invention ought define depending on appending claims is as the criterion.
Claims (11)
1. a video graphics array interface protective circuit, is characterized in that, at least comprises:
One signal generation unit, in order to produce a signal relevant with show image;
One switch unit couples this signal generation unit, in order to change this signal relevant with show image into one first displayable signal relevant with show image, and produces one first trigger pip;
One first power supply generation unit couples this switch unit, in order to provide one first power supply signal according to this first trigger pip; And
One first video graphics array interface unit, couples this first power supply generation unit and this switch unit, in order to receive this first displayable signal and this first power supply signal shows to provide a display unit.
2. video graphics array interface protective circuit according to claim 1; it is characterized in that; also comprising three wave filters couples between this first video graphics array interface unit and this switch unit; wherein said three wave filters in order to carry out filtering to a red analog signal, a blue analog signals and a green analog signal in this first displayable signal respectively, and send this red analog signal filtered, this blue analog signals and this green analog signal to this first video graphics array interface unit.
3. video graphics array interface protective circuit according to claim 2, is characterized in that, two inductance type π type LC low-pass filters that wave filter described in each is made up of two inductance and three electric capacity.
4. video graphics array interface protective circuit according to claim 1, is characterized in that, also comprises an electric capacity and is arranged between this first power supply generation unit and this first video graphics array interface unit, wherein one end ground connection of this electric capacity.
5. video graphics array interface protective circuit according to claim 1; it is characterized in that; also comprise a second source generation unit and couple this switch unit, and one second video graphics array interface unit couples this second source generation unit and this switch unit.
6. video graphics array interface protective circuit according to claim 5; it is characterized in that; one second trigger pip that this this switch unit of second source generation unit produces provides a second source signal, and this second video graphics array interface unit receives one second displayable signal and this second source signal shows to provide a display unit.
7. video graphics array interface protective circuit according to claim 5, is characterized in that, also comprises an electric capacity and is arranged between this second source generation unit and this second video graphics array interface unit, wherein one end ground connection of this electric capacity.
8. video graphics array interface protective circuit according to claim 6; it is characterized in that; also comprising three wave filters couples between this second video graphics array interface unit and this switch unit; wherein said three wave filters in order to carry out filtering to a red analog signal, a blue analog signals and a green analog signal in this second displayable signal respectively, and send this red analog signal filtered, this blue analog signals and this green analog signal to this second video graphics array interface unit.
9. a video graphics array interface protective circuit, is characterized in that, at least comprises:
One signal generation unit, in order to produce a signal relevant with show image and a control signal;
One switch unit couples this signal generation unit, select to export this and the conversion of show image relevant signals to one first displayable signal or one second displayable signal according to this control signal, this first displayable signal of output that this switch unit detects according to inside or this second displayable signal generation one first trigger pip or one second trigger pip;
One first power supply generation unit couples this switch unit, in order to provide one first power supply signal;
One second source generation unit couples this switch unit, in order to provide a second source signal;
One first video graphics array interface unit, couples this first power supply generation unit and this switch unit; And
One second video graphics array interface unit, couples this second source generation unit and this switch unit;
Wherein when this switch unit produces this first trigger pip, this the first power supply generation unit provides one first power supply signal to this first video graphics array interface unit, this the first displayable signal is shown to make a display unit, and when this switch unit produces this second trigger pip, this second source generation unit provides a second source signal to this second video graphics array interface unit, shows this second displayable signal to make a display unit.
10. video graphics array interface protective circuit according to claim 9, is characterized in that, also comprises one first electric capacity and is arranged between this first power supply generation unit and this first video graphics array interface unit, wherein one end ground connection of this first electric capacity; And one second electric capacity be arranged between this second source generation unit and this second video graphics array interface unit, wherein one end ground connection of this second electric capacity.
11. video graphics array interface protective circuits according to claim 9, it is characterized in that, also comprise: three wave filters couple between this first video graphics array interface unit and this switch unit, wherein said three wave filters in order to carry out filtering to a red analog signal, a blue analog signals and a green analog signal in this first displayable signal respectively, and send this red analog signal filtered, this blue analog signals and this green analog signal to this first video graphics array interface unit; And three wave filters couple between this second video graphics array interface unit and this switch unit, wherein said three wave filters in order to carry out filtering to a red analog signal, a blue analog signals and a green analog signal in this second displayable signal respectively, and send this red analog signal filtered, this blue analog signals and this green analog signal to this second video graphics array interface unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310376023.8A CN104424911B (en) | 2013-08-26 | 2013-08-26 | Video graphics array (VGA) interface protective circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310376023.8A CN104424911B (en) | 2013-08-26 | 2013-08-26 | Video graphics array (VGA) interface protective circuit |
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| Publication Number | Publication Date |
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| CN104424911A true CN104424911A (en) | 2015-03-18 |
| CN104424911B CN104424911B (en) | 2016-08-31 |
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| CN201310376023.8A Active CN104424911B (en) | 2013-08-26 | 2013-08-26 | Video graphics array (VGA) interface protective circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113053330A (en) * | 2019-12-26 | 2021-06-29 | 瑞鼎科技股份有限公司 | Source electrode driving circuit |
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|---|---|
| CN104424911B (en) | 2016-08-31 |
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