CN202210839U - Simulated high definition video interface clamping protective circuit - Google Patents
Simulated high definition video interface clamping protective circuit Download PDFInfo
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- CN202210839U CN202210839U CN2011202772499U CN201120277249U CN202210839U CN 202210839 U CN202210839 U CN 202210839U CN 2011202772499 U CN2011202772499 U CN 2011202772499U CN 201120277249 U CN201120277249 U CN 201120277249U CN 202210839 U CN202210839 U CN 202210839U
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Abstract
The utility model relates to a simulated high definition video interface clamping protective circuit, wherein a local positive supply 6 is connected with the anode of a fast recovery diode D1; the cathode of the fast recovery diode D1 is connected with the cathode of a transient diode D2; the anode of the transient diode D2 is connected with a reference ground 8; the transient diode D2 is connected in parallel with a ceramic capacitor C1 to form a high clamping voltage reference point 4; a local negative supply 7 is connected with the cathode of a fast recovery diode D4; the anode of the fast recovery diode D4 is connected with the anode of a transient diode D3; the cathode of the transient diode D3 is connected with the reference ground 8; the transient diode D3 is connected in parallel with a ceramic capacitor C2 to form a low clamping voltage reference point; video signal lines are connected with common terminals of diode pairs; the anodes of the diode pairs are connected with the low clamping voltage reference point, and the cathodes of the diode pairs are connected with the high clamping voltage reference point. The simulated high definition video interface clamping protective circuit can be used for the signal input/output signal line protection of the simulated high definition video interface.
Description
Technical field
The utility model relates to a kind of simulation HD video interface clamping protective circuit, is mainly used in the signal input/output signal line protection of simulation HD video interface, comprises signal level overvoltage protection, with ESD electrostatic defending two aspects.
Background technology
At present, the fashionable whole world of HD video, particularly in amusement audiovisual and large scale display industry, high definition has become inevitable standard, even monitoring trade, high Qinghua also becomes imperative trend.In order to support HD video, various transmission equipment, the switching devices that possess the high definition interface, and the editing and processing equipment of HD video, all a large amount of emerges.
The HD video interface comprises simulation HD video interface and digital high-definition video interface, and they all are widely used in various products.Because use the digital high-definition video interface, signal transmission distance is limited, or costs an arm and a leg, so, though its picture quality is better relatively, still can't replace simulation HD video interface, a very long time, both will and be stored in market.In low-end market, simulation HD video interface is still propagated its belief on a large scale even, and simulation HD video interface equipment is still favored very much.
Simulation HD video interface mainly comprises two kinds of YCbCr/YPbPr component vide interface and VGA CGI again.The former is mainly used in the amusement audiovisual.The latter mainly is used in computing field, and the also extensive use of large-screen industry can be supported more high-resolution simultaneously, graphic picture more at a high speed, or video image.No matter use which kind of interface, level overvoltage protection is with the ESD electrostatic defending safeguard measure that all is absolutely necessary.Particularly in large-screen was used, multiple signals switched, handle through concentrating equipment after long line transmission, can form very big voltage fluctuation at centrostigma.Complicated site environment and frequent hot plug operations also form surge voltage and static release at interface easily.The all nonvolatil probably damage equipment of these phenomenons.Perfect safeguard measure can effectively be avoided these infringements.
High clear video image takies higher bandwidth, and signaling rate is faster, continues the overvoltage and the electrostatic discharge protective circuit that get off from the SD epoch, and it is unable to do what one wishes usually to seem, perhaps can influence signal quality.So some chip manufacturers have released the special-purpose electrostatic protection chip of HW High Way rapidly, to support new HD video interface.Just these special chip prices are all very high, so, press for a kind of cheap, but performance satisfies the high bandwidth of HD video, high-speed overvoltage, electrostatic discharge protection circuit.
This protective circuit that the present invention relates to all adopts traditional devices, and is cheap, and buying is convenient, and performance can match in excellence or beauty with up-to-date special-purpose electrostatic protection chip, and cost performance is very high, very according to practicality.On the market, some equipment also has similar circuit, but goes back imperfection, many disadvantages are arranged, and this protective circuit in this patent solves these problems thoroughly.
The utility model content
The purpose of the utility model provides a kind of simulation HD video interface clamping protective circuit; A kind of perfect signal overvoltage is provided; And the protective circuit of ESD electrostatic defending; This circuit is connected on the holding wire of simulation HD video interface, prevent video input/output signal generation overvoltage, the surge of high bandwidth, and static discharges the permanent damage of bringing to interface chip; The utility model voltage protection scope can be regulated according to demand, adaptable across various analog video interface chips.
In order to achieve the above object, the utility model adopts following technical scheme:
A kind of simulation HD video interface clamping protective circuit of the utility model; Wherein: local positive supply 6 connects the anode of fast recovery diode D1; The negative electrode of fast recovery diode D1 connects the negative electrode of transition diode D2; The anode of transition diode D2 connects with reference to ground 8, and transition diode D2 goes up parallelly connected ceramic disc capacitor C1, forms high clamp voltage reference point 4 at the negative electrode of fast recovery diode D1 and the negative electrode junction of transition diode D2; Local negative supply 7 connects the negative electrode of fast recovery diode D4; The anode of fast recovery diode D4 connects the anode of transition diode D3; The negative electrode of transition diode D3 connects with reference to ground 8; Transition diode D3 goes up parallelly connected ceramic disc capacitor C2, forms in the junction of the anode of fast recovery diode D4 and the anode of transition diode D3 and hangs down clamp voltage reference point 5; Video signal cable connects the common port of diode pair, and the anode of diode pair connects low clamp voltage reference point 5, and the negative electrode of diode pair connects high clamp voltage reference point 4.
Wherein, said video signal cable comprises video signal components RED/Pr/Cr, video signal components GREEN/Y, video signal components BLUE/Pb/Cb.
Wherein, said diode pair is made up of two diodes, and wherein, the common port of said diode pair is the junction of the anode and the negative electrode of these two diodes.
Owing to taked above technical scheme, the advantage of the utility model is:
The utility model can be used to simulate the signal input/output signal line protection of HD video interface, comprises signal level overvoltage protection, with ESD electrostatic defending two aspects; The utility model can prevent video input/output signal generation overvoltage, the surge of high bandwidth, and static discharges the permanent damage of bringing to interface chip; The voltage protection scope of the utility model can be regulated according to demand, adaptable across various analog video interface chips.
Description of drawings
Fig. 1 is the structural representation of the utility model.
Among the figure: 1. video signal components RED/Pr/Cr, 2. video signal components GREEN/Y, 3. video signal components BLUE/Pb/Cb; 4. high clamp voltage reference point, 5. low clamp voltage reference point, 6. local positive supply; 7. local negative supply is 8. with reference to ground, D1, D4. fast recovery diode; D2, D3. transition diode, D5, D6, D7. fast recovery diode are right, C1, C2. ceramic disc capacitor.
Embodiment
Following examples are used to explain the utility model, but are not used for limiting the scope of the utility model.
The utility model uses common small-power transition diode, cooperates fast recovery diode and ceramic disc capacitor, generates clamp voltage, confirms the highest and minimum of signal level.The video waveform parameter of defined can be confirmed in the reference video signal standard, and the video voltage scope is generally between 0 to 1V.But; Consider in the plurality of applications that particularly some video transmissions, the switching device that arrives commonly used in the large-screen industry all adopted AC coupled; Or bias voltage of artificial increase; Perhaps the video transmission cable is oversize again, and the DC level of vision signal fluctuates or drifted about, and causes the voltage range of vision signal to expand to-5V to 5V.So, generally speaking, need two groups of devices here, generate two clamp voltages, a 5V, one-5V.
Referring to Fig. 1; A kind of simulation HD video interface clamping protective circuit of the utility model is made up of D5, D6, D7, ceramic disc capacitor C1, C2 video signal components RED/Pr/Cr1, video signal components GREEN/Y2, video signal components BLUE/Pb/Cb3, high clamp voltage reference point 4, low clamp voltage reference point 5, local positive supply 6, local negative supply 7, reference ground 8, fast recovery diode D1, D4, transition diode D2, D3, fast recovery diode.
Local positive supply 6 connects the anode of fast recovery diode D1, and the negative electrode of fast recovery diode D1 connects the negative electrode of transition diode D2, and the anode of transition diode D2 connects with reference to ground 8.Transition diode D2 goes up parallelly connected ceramic disc capacitor C1.So just generated high clamp voltage reference point 4.The initial voltage of high clamp voltage reference point 4 is confirmed by local positive supply 6, the highest puncture voltage that can not surpass transition diode D2.
Local negative supply 7 connects the negative electrode of fast recovery diode D4, and the anode of fast recovery diode D4 connects the anode of transition diode D3, and the negative electrode of transition diode D3 connects with reference to ground 8.Transition diode D3 goes up parallelly connected ceramic disc capacitor C2.So just generated low clamp voltage reference point 5.The initial voltage of low clamp voltage reference point 5 is confirmed by local negative supply 7, the highest puncture voltage that can not surpass transition diode D3 of its absolute value.
Three groups of video signal cables 1,2,3 connect the common port of three groups of fast recovery diodes to D5, D6, D7; Three groups of fast recovery diodes connect low 5, three groups of fast recovery diodes of clamp voltage reference point to the anode of D5, D6, D7 the negative electrode of D5, D6, D7 are connected high clamp voltage reference point 4.
The simulation high-definition video signal generally all comprises three component signals, such as, YCbCr comprises Y2, Cb3 and Cr1, and YPbPr comprises Y2, Pb3 and Pr1, and VGA comprises RED1, GREEN2 and BLUE3.Signal component RED/Pr/Cr1 connects the common port of fast recovery diode to D5, and fast recovery diode connects high clamp voltage reference point 4 to the independent negative electrode of D5, and fast recovery diode connects low clamp voltage reference point 5 to the assistant anode of D5.Signal component GREEN/Y2 connects the common port of fast recovery diode to D6, and fast recovery diode connects high clamp voltage reference point 4 to the independent negative electrode of D6, and fast recovery diode connects low clamp voltage reference point 5 to the assistant anode of D6.Signal component BLUE/Pb/Cb3 connects the common port of fast recovery diode to D7, and fast recovery diode connects high clamp voltage reference point 4 to the independent negative electrode of D7, and fast recovery diode connects low clamp voltage reference point 5 to the assistant anode of D7.
When video voltage too high; The voltage that surpasses high clamp voltage reference point 4, fast recovery diode connect the diode current flow of common port to independent negative electrode among D5, D6, the D7; Too high voltage is able to release, and the voltage of vision signal finally is limited under the high clamp voltage.
When video voltage low excessively; The voltage that surpasses low clamp voltage reference point 5, fast recovery diode connect the diode current flow of common port to assistant anode among D5, D6, the D7; Cross low voltage and be able to replenish, the voltage of vision signal finally is limited on the low clamp voltage.
Obviously, the foregoing description of the utility model only be for explain clearly that the utility model does for example, and be not to be qualification to the execution mode of the utility model.For the those of ordinary skill in affiliated field, on the basis of above-mentioned explanation, can also make other multi-form variation or change.Here can't give exhaustive to all execution modes.Conspicuous variation that every technical scheme that belongs to the utility model is extended out or change still are in the row of the protection range of the utility model.
Claims (3)
1. simulate HD video interface clamping protective circuit for one kind; It is characterized in that: local positive supply (6) connects the anode of fast recovery diode (D1); The negative electrode of fast recovery diode (D1) connects the negative electrode of transition diode (D2); The anode of transition diode (D2) connects with reference to ground (8), and transition diode (D2) is gone up parallelly connected ceramic disc capacitor (C1), forms high clamp voltage reference point (4) at the negative electrode of fast recovery diode (D1) and the negative electrode junction of transition diode (D2); Local negative supply (7) connects the negative electrode of fast recovery diode (D4); The anode of fast recovery diode (D4) connects the anode of transition diode (D3); The negative electrode of transition diode (D3) connects with reference to ground (8); Transition diode (D3) is gone up parallelly connected ceramic disc capacitor (C2), forms in the junction of the anode of fast recovery diode (D4) and the anode of transition diode (D3) and hangs down clamp voltage reference point (5); Video signal cable connects the common port of diode pair, and the anode of diode pair connects low clamp voltage reference point (5), and the negative electrode of diode pair connects high clamp voltage reference point (4).
2. a kind of simulation HD video interface clamping protective circuit according to claim 1, it is characterized in that: said video signal cable comprises video signal components RED/Pr/Cr, video signal components GREEN/Y, video signal components BLUE/Pb/Cb.
3. a kind of simulation HD video interface clamping protective circuit according to claim 1, it is characterized in that: said diode pair is made up of two diodes, and wherein, the common port of said diode pair is the junction of the anode and the negative electrode of these two diodes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202772499U CN202210839U (en) | 2011-08-01 | 2011-08-01 | Simulated high definition video interface clamping protective circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202772499U CN202210839U (en) | 2011-08-01 | 2011-08-01 | Simulated high definition video interface clamping protective circuit |
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| Publication Number | Publication Date |
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| CN202210839U true CN202210839U (en) | 2012-05-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011202772499U Withdrawn - After Issue CN202210839U (en) | 2011-08-01 | 2011-08-01 | Simulated high definition video interface clamping protective circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102340645A (en) * | 2011-08-01 | 2012-02-01 | 北京彩讯科技股份有限公司 | Clamping protection circuit of analog high-definition video interface |
| CN105405422A (en) * | 2015-12-10 | 2016-03-16 | 昆山龙腾光电有限公司 | Voltage stabilizing power supply circuit and liquid crystal display device |
-
2011
- 2011-08-01 CN CN2011202772499U patent/CN202210839U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102340645A (en) * | 2011-08-01 | 2012-02-01 | 北京彩讯科技股份有限公司 | Clamping protection circuit of analog high-definition video interface |
| CN102340645B (en) * | 2011-08-01 | 2015-08-05 | 北京彩讯科技股份有限公司 | Clamping protection circuit of analog high-definition video interface |
| CN105405422A (en) * | 2015-12-10 | 2016-03-16 | 昆山龙腾光电有限公司 | Voltage stabilizing power supply circuit and liquid crystal display device |
| CN105405422B (en) * | 2015-12-10 | 2018-07-06 | 昆山龙腾光电有限公司 | A kind of voltage-stabilized power supply circuit and liquid crystal display device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Free format text: FORMER OWNER: LU YUAN Effective date: 20121031 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20121031 Address after: 100085, room 1009, building 10, block C, Jinyu Ka Wah building, No. 9, 3rd Street, Haidian District, Beijing Patentee after: Beijing Triolion Science & Technology Co., Ltd. Address before: 100085, room 1009, building 10, block C, Jinyu Ka Wah building, No. 9, 3rd Street, Haidian District, Beijing Patentee before: Beijing Triolion Science & Technology Co., Ltd. Patentee before: Lu Yuan |
|
| C56 | Change in the name or address of the patentee | ||
| CP02 | Change in the address of a patent holder |
Address after: 100094, Room 301, building 8, Zhongguancun Software Park, 8 northeast Wang Xi Road, Beijing, Haidian District Patentee after: Beijing Triolion Science & Technology Co., Ltd. Address before: 100085, room 1009, building 10, block C, Jinyu Ka Wah building, No. 9, 3rd Street, Haidian District, Beijing Patentee before: Beijing Triolion Science & Technology Co., Ltd. |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20120502 Effective date of abandoning: 20150805 |
|
| RGAV | Abandon patent right to avoid regrant |