CN102201663A - Protection circuit - Google Patents
Protection circuit Download PDFInfo
- Publication number
- CN102201663A CN102201663A CN2010101290446A CN201010129044A CN102201663A CN 102201663 A CN102201663 A CN 102201663A CN 2010101290446 A CN2010101290446 A CN 2010101290446A CN 201010129044 A CN201010129044 A CN 201010129044A CN 102201663 A CN102201663 A CN 102201663A
- Authority
- CN
- China
- Prior art keywords
- sdi
- protection
- transmission line
- external circuit
- connects
- 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.)
- Pending
Links
Images
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a protection circuit. The technical scheme of the invention is as follows: a SDI (Serial Digital Interface) receiving terminal connects an external circuit transmission line through a TBU (Transient Blocking Unit) protection unit; the SDI receiving terminal connects the external circuit transmission line through a bidirectional TVS (Transient Voltage Suppressor) tube and a gas protection tube; the bidirectional TVS tube and the gas protection tube connect a protection land; the SDI (Serial Digital Interface) sending terminal connects the external circuit transmission line through the TBU (Transient Blocking Unit) protection unit; the SDI sending terminal connects the external circuit transmission line through the bidirectional TVS (Transient Voltage Suppressor) tube and the gas protection tube; and the bidirectional TVS tube and the gas protection tube connect the protection land. According to the protection circuit, protections such as the lightning protection, antistatic protection, short-circuit proof protection and the like of the port of the SDI equipment are realized.
Description
Technical field
The present invention relates to equipment lightning protection, antistatic and anti-short circuit jamming field, relate in particular to a kind of protective circuit.
Background technology
Existing less at HD-SDI (High Definition-Serial Digital Interface, high-definition digital serial) port protection scheme, the scope of its application also only limits to radio data system.Along with the universalness of high definition technology, the SDI technology will get more and more and appear at common industry and civilian occasion in the future, and the resist technology of SDI port is also more and more important thereupon.
Sdi signal speed very high (SDI is 1.485G, and 3G-SDI is 3.0G), common simulation video port protection scheme can not satisfy the requirement of SDI port-guard, and video is had the bypass effect, makes image definition descend, the loss video signal quality.Therefore be necessary very much to find the effective more scheme of a cover to solve this problem.
Summary of the invention
In view of this, the technical problem to be solved in the present invention is, a kind of protective circuit is provided, and can carry out kinds of protect such as lightning protection, antistatic, anti-short-circuit protection to the SDI port of equipment.
For this reason, the embodiment of the invention adopts following technical scheme:
The SDI receiving terminal connects the external circuit transmission line by the TBU protected location; Described SDI receiving terminal also connects described external circuit transmission line by two-way TVS pipe and gas protection tube successively; The indirect protection ground of described two-way TVS pipe and gas protection tube;
The SDI transmitting terminal connects the external circuit transmission line by the TBU protected location; Described SDI transmitting terminal also connects described external circuit transmission line by two-way TVS pipe and gas protection tube successively; The indirect protection ground of described two-way TVS pipe and gas protection tube.
The embodiment of the invention also provides another kind of protective circuit, comprising:
The SDI receiving terminal connects the external circuit transmission line by the TBU protected location; Described SDI receiving terminal also connects described external circuit transmission line by two-way TVS pipe and gas protection tube successively; The indirect protection ground of described two-way TVS pipe and gas protection tube.
The embodiment of the invention also provides another kind of protective circuit, comprising:
The SDI transmitting terminal connects the external circuit transmission line by the TBU protected location; Described SDI transmitting terminal also connects described external circuit transmission line by two-way TVS pipe and gas protection tube successively; The indirect protection ground of described two-way TVS pipe and gas protection tube.
Technique effect for technique scheme is analyzed as follows:
Be used for the first class of protection part of being struck by lightning, surge suppresses is made up of the Buchholz protection pipe; The second class protection part that is used for short-circuit protection is made up of TBU (Transient Blocking Unit, moment blocking unit); Be used for electrostatic interference is carried out the three-level protective part of common mode, differential mode protection, form by TVS pipe (Transient Voltage Suppressor, Transient Voltage Suppressor, i.e. Transient Suppression Diode).
The characteristics of Buchholz protection pipe and Transient Suppression Diode are well-known, still at the protection of SDI port, require its junction capacitance lower, preferably less than 1Pf, can reduce the influence to vision signal to greatest extent; And using TBU to replace the performance that PTC (Polymeric Positive Temperature Coefficient, resettable fuse) can improve safeguard greatly, TBU (ns rank) in a short period of time plays over-voltage over-current protection.
Description of drawings
Fig. 1 is an embodiment of the invention protective circuit structural representation;
Fig. 2 is the implementation structure example of embodiment of the invention protective circuit.
Embodiment
Below, be described with reference to the accompanying drawings the realization of embodiment of the invention protective circuit.
Fig. 1 is that embodiment of the invention protective circuit structure realizes schematic diagram, and as shown in Figure 1, this protective circuit comprises:
The SDI receiving terminal connects the external circuit transmission line by the TBU protected location; The SDI receiving terminal also connects the external circuit transmission line by two-way TVS pipe and gas protection tube successively; The indirect protection ground of two-way TVS pipe and gas protection tube;
The SDI transmitting terminal connects the external circuit transmission line by the TBU protected location; The SDI transmitting terminal also connects the external circuit transmission line by two-way TVS pipe and gas protection tube successively; The indirect protection ground of two-way TVS pipe and gas protection tube.
TBU protected location, two-way TVS pipe that the TBU protected location that the SDI receiving terminal connects, two-way TVS pipe and gas protection tube are connected with the SDI transmitting terminal respectively are identical with gas protection tube specification.As can be seen, at the receiving terminal and the transmitting terminal of SDI equipment, the connected mode of device is identical from image.Preferably, the embodiment of the invention adopts identical protective circuit at SDI equipment receiving terminal with transmitting terminal, to reach the purpose of protecting SDI equipment two ends simultaneously.Certainly, in actual applications, the embodiment of the invention can include only the protective circuit that the SDI receiving terminal is connected, and perhaps includes only the protective circuit that the SDI transmitting terminal is connected.
In actual applications,, when occurring static, thunder and lightning, surge etc. suddenly and cause situation that the circuit voltage electric current increases sharply, static, thunderbolt, when surge energy arrives, the TBU protected location can be in the very short time, and electric current is cut off in response rapidly.Two-way TVS manages rapid conducting; when the pressure drop on the two-way TVS pipe reaches the starting resistor of Buchholz protection pipe; the conducting of Buchholz protection pipe; most of energy from Buchholz protection pipe bleed off to protection ground; thereby realize inhibition to thunderbolt, surge, and, by the Buchholz protection pipe being connect protection ground; can be so that disturbance current with the path bleed off of minimum, be protected effect thereby strengthen.The circuit that two-way TVS pipe constitutes plays the effect of electrostatic interference being carried out common mode, differential mode protection.
Optimum, the TBU protected location response time that present embodiment adopts reaches the ns rank, and the Buchholz protection pipe that this example adopts is high-power Buchholz protection pipe.
Fig. 2 is a kind of more specifically protective circuit of embodiment of the invention implementation method.
Protective circuit is connected the SDI device port, and promptly SDI receiving port, SDI transmit port all can.For convenience of explanation, present embodiment is referred to as the SDI device port with SDI receiving port and SDI transmit port.The SDI device port connects the external circuit transmission line by TBU protected location RSP1; The SDI device port also connects the external circuit transmission line by two-way TVS pipe D1 and gas protection tube BA1 successively; The indirect protection ground of two-way TVS pipe D1 and gas protection tube BA1.The protective circuit that the embodiment of the invention provides, surge protection grade can reach line line 6KV, and the electrostatic defending grade can reach contact discharge 6KV, atmospherical discharges 8KV, and shutoff signal line when occurring the 220mA electric current on the holding wire effectively carries out short-circuit protection.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (4)
1. a protective circuit is characterized in that, comprising:
The SDI receiving terminal connects the external circuit transmission line by the TBU protected location; Described SDI receiving terminal also connects described external circuit transmission line by two-way TVS pipe and gas protection tube successively; The indirect protection ground of described two-way TVS pipe and gas protection tube;
The SDI transmitting terminal connects the external circuit transmission line by the TBU protected location; Described SDI transmitting terminal also connects described external circuit transmission line by two-way TVS pipe and gas protection tube successively; The indirect protection ground of described two-way TVS pipe and gas protection tube.
2. protective circuit as claimed in claim 1 is characterized in that, comprising:
The TBU protected location that the SDI receiving terminal connects is identical with the TBU protected location specification that the SDI transmitting terminal connects;
The two-way TVS pipe that the SDI receiving terminal connects is identical with the two-way TVS pipe specification that the SDI transmitting terminal connects;
The SDI receiving terminal is identical by the Buchholz protection pipe specification that two-way TVS pipe connects with the SDI transmitting terminal by the Buchholz protection pipe that two-way TVS pipe connects.
3. a protective circuit is characterized in that, comprising:
The SDI receiving terminal connects the external circuit transmission line by the TBU protected location; Described SDI receiving terminal also connects described external circuit transmission line by two-way TVS pipe and gas protection tube successively; The indirect protection ground of described two-way TVS pipe and gas protection tube.
4. a protective circuit is characterized in that, comprising:
The SDI transmitting terminal connects the external circuit transmission line by the TBU protected location; Described SDI transmitting terminal also connects described external circuit transmission line by two-way TVS pipe and gas protection tube successively; The indirect protection ground of described two-way TVS pipe and gas protection tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101290446A CN102201663A (en) | 2010-03-22 | 2010-03-22 | Protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101290446A CN102201663A (en) | 2010-03-22 | 2010-03-22 | Protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102201663A true CN102201663A (en) | 2011-09-28 |
Family
ID=44662139
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010101290446A Pending CN102201663A (en) | 2010-03-22 | 2010-03-22 | Protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102201663A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1666398A (en) * | 2002-07-02 | 2005-09-07 | 富尔特克专营有限公司 | Protection and indication apparatus |
| CN200979987Y (en) * | 2006-12-13 | 2007-11-21 | 南京普天通信股份有限公司 | A protective unit using an over-current and over-voltage protection TBU unit |
| US20080192394A1 (en) * | 2004-11-12 | 2008-08-14 | Harris Richard A | Surge Protection Device |
| CN201243201Y (en) * | 2008-05-15 | 2009-05-20 | 中兴通讯股份有限公司 | Interface protection circuit for preventing over pressure and over current |
| CN201417941Y (en) * | 2009-06-08 | 2010-03-03 | 杭州华三通信技术有限公司 | Interface protection circuit |
-
2010
- 2010-03-22 CN CN2010101290446A patent/CN102201663A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1666398A (en) * | 2002-07-02 | 2005-09-07 | 富尔特克专营有限公司 | Protection and indication apparatus |
| US20080192394A1 (en) * | 2004-11-12 | 2008-08-14 | Harris Richard A | Surge Protection Device |
| CN200979987Y (en) * | 2006-12-13 | 2007-11-21 | 南京普天通信股份有限公司 | A protective unit using an over-current and over-voltage protection TBU unit |
| CN201243201Y (en) * | 2008-05-15 | 2009-05-20 | 中兴通讯股份有限公司 | Interface protection circuit for preventing over pressure and over current |
| CN201417941Y (en) * | 2009-06-08 | 2010-03-03 | 杭州华三通信技术有限公司 | Interface protection circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR101085467B1 (en) | Surge preventing circuit, local area network connector, and network module | |
| CN101872968A (en) | Protective circuit | |
| CN203774781U (en) | Signal interface high-power electromagnetic pulse protection device | |
| CN200950537Y (en) | Protective circuit | |
| CN202159972U (en) | Signal lightning protection device | |
| CN201898328U (en) | Semiconductor surge protection device | |
| CN202713356U (en) | Interface circuit realizing over-voltage and over-current protection and electronic device | |
| CN104134986A (en) | Two-way dual-mode 485 communication lightning protector | |
| CN201937264U (en) | Signal surge protection circuit | |
| CN208890365U (en) | A kind of the power lightning protection circuit and lightning protection power source of 5G communication base station | |
| CN102201663A (en) | Protection circuit | |
| CN101877473B (en) | Protection circuit in surge protector used for high-definition camera | |
| KR101456569B1 (en) | Surge protector | |
| KR20160096142A (en) | Fault current limiter with interleaved windings | |
| CN207753452U (en) | A kind of network electric power two-in-one lightning | |
| CN203983982U (en) | A kind of two-way bimodulus 485 communication lightning protection devices | |
| KR200422625Y1 (en) | Surge Protector for Signal Railroad | |
| CN206533129U (en) | A kind of lightning protection circuit for electronic equipment RS485 interfaces | |
| CN104113054A (en) | Combined type anti-thunder equipment capable of preventing concentrated copy electric energy meter from being damaged by thunder and lightning | |
| CN201994651U (en) | Lightning protection control panel and lightning protection camera device | |
| CN113439372A (en) | Protection against alternating voltage conditions | |
| CN203312799U (en) | Telephone line lightning arrester | |
| CN201674201U (en) | Protection circuit in surge protective device for high definition camera | |
| CN210074763U (en) | SPD for realizing surge protection of RS485 port by using electronic current limiter | |
| CN203261018U (en) | Lightning protection device for mega-byte network |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20110928 |