CN203086131U - Static electricity protection HDMI interface - Google Patents
Static electricity protection HDMI interface Download PDFInfo
- Publication number
- CN203086131U CN203086131U CN 201320024106 CN201320024106U CN203086131U CN 203086131 U CN203086131 U CN 203086131U CN 201320024106 CN201320024106 CN 201320024106 CN 201320024106 U CN201320024106 U CN 201320024106U CN 203086131 U CN203086131 U CN 203086131U
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- CN
- China
- Prior art keywords
- hdmi interface
- tvs pipe
- static electricity
- holding wire
- electrostatic
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- 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.)
- Expired - Fee Related
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Abstract
The utility model discloses a static electricity protection HDMI interface which is fixed at one end of a PCB board. Each signal line of the HDMI interface except a grounded signal line of the HDMI interface is connected with a TVS tube, wherein one end of the TVS tube is connected with the signal line, and the other end is connected with the digital ground on the PCB board. According to the utility model, the static electricity protection design of the HDMI interface can effectively solve the problem that static electricity everywhere in testing and life interferes with a display with the HDMI interface and a graphics card with the HDMI interface; and since the response speed of a transient diode is fast, the phenomenon of aging is avoided, and the parasitic capacitance is small, a device with the HDMI interface can be effectively protected from static electricity interference for a long time.
Description
[technical field]
The utility model relates to multimedia interface, relates in particular to a kind of electrostatic defending HDMI interface.
[background technology]
HDMI(High-DefinitionMultimediaInterface, definition multimedia interface) be that first being supported on the single line cable transmitted without digital high definition, multichannel audio and the intelligent format of compression and the digital interface of control command data.Because its high definition and multichannel audio, so its interface is widely used in TV and display device and the same video card that is equipped with.
Along with popularizing of HDMI interface, thing followed HDMI electrostatic defending problem also produces, and a lot of displays or TV are just because once plug causes equipment to burn out, and its basic reason is that the HDMI interface is not done the electrostatic defending design; As everyone knows, human body has a large amount of electric charges on one's body, and electrostatic potential can reach several kilovolts even several ten thousand volts, and especially Gan Zao season, human body directly is seen everywhere to the phenomenon of metallic object discharge.Therefore be easy to it is produced electrostatic interference when everybody contacts the HDMI interface, of short duration demonstration flower screen appears in light then display, dodge frequency, problem such as restart, and is heavy then directly burn out the main control chip of display or video card.
[utility model content]
The utility model provides a kind of electrostatic defending HDMI interface, has electrostatic defending design, solves the electrostatic interference problem of static ubiquitous in test and the life to the equipment that contains the HDMI interface, and effectively protection has the equipment of HDMI interface.
The technical solution of the utility model is:
A kind of electrostatic defending HDMI interface is fixed on an end of pcb board, is connected with the TVS pipe on each holding wire except that ground connection of HDMI interface, and an end of this TVS pipe is connected with holding wire, digitally being connected on the other end and the pcb board.
Electrostatic defending HDMI interface of the present utility model, on each holding wire of HDMI interface, be connected with the TVS pipe, when the HDMI interface is subjected to electrostatic interference, electrostatic energy can be directly released on the holding wire or be coupled on the holding wire, and electrostatic energy transmission on signal can present one high-tension energy of a charge; When electrostatic energy is managed through TVS, the voltage of electrostatic energy can start the TVS pipe, because the corresponding time of TVS pipe is in the ns level, make holding wire become Low ESR from high impedance fast by the TVS pipe over the ground, electrostatic interference is released rapidly to ground, and the voltage on the holding wire is stabilized in the clamp voltage of TVS pipe, does not influence the signal normal transmission on the holding wire; Solved the electrostatic interference problem of static ubiquitous in test and the life to the equipment that contains the HDMI interface, effectively protection has the equipment of HDMI interface.
[description of drawings]
Fig. 1 is electrostatic defending HDMI interface of the present utility model circuit theory diagrams in one embodiment.
[embodiment]
Below in conjunction with accompanying drawing specific embodiment of the utility model is done a detailed elaboration.
As Fig. 1, electrostatic defending HDMI interface of the present utility model, be fixed on an end of pcb board, include the pin of a plurality of holding wires and ground connection, on each holding wire except that ground connection of HDMI interface, be connected with the TVS pipe, one end of this TVS pipe is connected with holding wire, digitally being connected on the other end and the pcb board.
HDMI interface shown in Fig. 1 comprises holding wire TX2P, TX2N, TX1P, TX1N, TX0P, TX0N, HOTPLUG, HDMI_5V, DDCSDA, DDCSCL, CEC, TXCN, TXCP, also comprise with pcb board on pin TMDS D2 SHIELD, the TMDS D1 SHIELD, TMDS D0 SHIELD, DDC/CECGND, the TMDS CK SHIELD that digitally are connected; Wherein, pin TMDS D2 SHIELD, TMDS D1 SHIELD, TMDS D0SHIELD, DDC/CEC GND, TMDS CK SHIELD directly are connected with F digitally, do not need to connect TVS and manage;
The end of TVS pipe D1 is connected on the holding wire TX2P, and another termination digitally; TVS pipe D2 is connected on the holding wire TX2N, and another termination digitally; TVS pipe D3 is connected on the holding wire TX1P other end ground connection; The end of TVS pipe D4 is connected on the holding wire TX1N, and another termination digitally; The end of TVS pipe D5 is connected on the holding wire TX0P, and another termination digitally; The end of TVS pipe D6 is connected on the holding wire TX0N, and another termination digitally; The end of TVS pipe D7 is connected on the holding wire TXCP, and another termination digitally; The end of TVS pipe D8 is connected on the holding wire TXCN, and another termination digitally; The end of TVS pipe D9 is connected on the holding wire CEC, and another termination digitally; The end of TVS pipe D10 is connected on the holding wire DDCSCL, and another termination digitally; The end of TVS pipe D11 is connected on the holding wire DDCSDA, and another termination digitally; The end of TVS pipe D12 is connected on the holding wire HDMI_5V, and another termination digitally; The end of TVS pipe D13 is connected on the holding wire HOTPLUG, and another termination digitally.
The TVS pipe is a kind of high-effect passive protection device of diode form.Its characteristic is its both end voltage when being lower than its starting resistor, and it is to be high impedance in operating circuit, does not form the loop with ground, do not influence signal normal transmission; When its two ends are subjected to the transient high voltages energy impact, when promptly being higher than its starting resistor, can be at a terrific speed, the high impedance of its two interpolar is become Low ESR, form the loop with ground, electrostatic interference on the holding wire is released to ground level, and make the voltage of two interpolars be fixed on its clamp voltage, do not influence the normal transmission of signal.Solved the electrostatic interference problem of static ubiquitous in test and the life to the equipment that contains the HDMI interface, effectively protection has the equipment of HDMI interface.
Wherein, the position of described TVS pipe is preferably near the HDMI interface.Electrostatic interference is released with the shortest path and the fastest time, prevent that electrostatic interference from arriving other components and parts.
In a preferred embodiment, described TVS pipe is preferably two-way TVS pipe; Why select two-way TVS pipe, main cause is disturbed for the electric charge of electrostatic interference essence for accumulative total, electric charge has just by negative, so electrostatic interference also have just having negative, if select unidirectional TVS pipe, when the HDMI interface is subjected to bearing the electrostatic energy interference, because the response characteristic of unidirectional TVS pipe is for only responding positive voltage, so the negative electrostatic energy of can't releasing disturbs; And being generating positive and negative voltage, the response characteristic of two-way TVS pipe can both start when surpassing its starting resistor, so the electrostatic interference that can effectively the HDMI interface be subjected to is in time released to ground.
When two-way TVS manages option, notice that its starting resistor can not be less than the normal working voltage of signal, it is too high that but its starting resistor can not be selected, prevented lower slightly electrostatic interference by the time two-way TVS pipe can not start, cause the influence and the components from being damaged that is connected of line signal transmission.
The electrostatic defending design of the utility model HDMI interface; can effectively solve static ubiquitous in test and the life to display that contains the HDMI interface and the video card interference problem that contains the HDMI interface; because the response speed of transient state diode is fast; no aging phenomenon; and its parasitic capacitance is little, avoids electrostatic interference so the permanently effective protection of energy contains the equipment of HDMI interface.
Above-described the utility model execution mode does not constitute the qualification to the utility model protection range.Any modification of within spirit of the present utility model and principle, being done, be equal to and replace and improvement etc., all should be included within the claim protection range of the present utility model.
Claims (3)
1. electrostatic defending HDMI interface is fixed on an end of pcb board, and it is characterized in that: be connected with the TVS pipe on each holding wire except that ground connection of HDMI interface, an end of this TVS pipe is connected with holding wire, digitally being connected on the other end and the pcb board.
2. electrostatic defending HDMI interface according to claim 1 is characterized in that: the position of described TVS pipe is near the HDMI interface.
3. electrostatic defending HDMI interface according to claim 1 is characterized in that: described TVS pipe is two-way TVS pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320024106 CN203086131U (en) | 2013-01-17 | 2013-01-17 | Static electricity protection HDMI interface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320024106 CN203086131U (en) | 2013-01-17 | 2013-01-17 | Static electricity protection HDMI interface |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203086131U true CN203086131U (en) | 2013-07-24 |
Family
ID=48831936
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320024106 Expired - Fee Related CN203086131U (en) | 2013-01-17 | 2013-01-17 | Static electricity protection HDMI interface |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203086131U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111740400A (en) * | 2020-06-22 | 2020-10-02 | 广东九联科技股份有限公司 | Circuit and method for reducing influence of ESD device on high-speed signal |
| US11509134B2 (en) | 2016-12-23 | 2022-11-22 | Huawei Technologies Co., Ltd. | Communication interface protection circuit having transient voltage suppression |
-
2013
- 2013-01-17 CN CN 201320024106 patent/CN203086131U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11509134B2 (en) | 2016-12-23 | 2022-11-22 | Huawei Technologies Co., Ltd. | Communication interface protection circuit having transient voltage suppression |
| CN111740400A (en) * | 2020-06-22 | 2020-10-02 | 广东九联科技股份有限公司 | Circuit and method for reducing influence of ESD device on high-speed signal |
| CN111740400B (en) * | 2020-06-22 | 2023-02-14 | 广东九联科技股份有限公司 | Circuit and method for reducing influence of ESD device on high-speed signal |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130724 Termination date: 20170117 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |