CN202550526U - Over-voltage protection circuit of web camera - Google Patents
Over-voltage protection circuit of web camera Download PDFInfo
- Publication number
- CN202550526U CN202550526U CN201220200341XU CN201220200341U CN202550526U CN 202550526 U CN202550526 U CN 202550526U CN 201220200341X U CN201220200341X U CN 201220200341XU CN 201220200341 U CN201220200341 U CN 201220200341U CN 202550526 U CN202550526 U CN 202550526U
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Abstract
The utility model relates to an over-voltage protection circuit of a web camera, aiming at solving the problems that the web camera cannot be protected under the situations of induced lightning current, over-voltage and severe voltage fluctuation, the structure is too complex and the production cost is high in the prior art. The over-voltage protection circuit comprises a power supply protection circuit and a signal protection circuit which are mutually connected. The power supply protection circuit comprises a power supply voltage relief pipe, a voltage dependent resistor and a diode. One end of the power supply voltage relief pipe is connected with the voltage dependent resistor and the diode. The other end of the voltage dependent resistor is connected with a No.1 light-emitting diode and a resistance wire which are connected in parallel. The other ends of the No.1 light-emitting diode and the resistance wire are connected with a power supply protection resistor. The other end of the power supply protection resistor is connected with a No.2 light-emitting diode. The other end of the No.2 light-emitting diode is connected with the power supply voltage relief pipe through the diode. Therefore, the over-voltage protection circuit of the web camera has the advantages that not only can the web camera be protected under the situations of induced lightning current, over-voltage and severe voltage fluctuation, but also the structure is simpler and the production cost is lower.
Description
Technical field
The utility model relates to a kind of web camera overvoltage crowbar.
Background technology
At present; Common web camera is to form through power supply, video and control signal three parts, in model change speed very fast today, and the new-type network video camera; Video integrates with control; Through RJ45 wherein two passages realize original functions, power unit is constant, and is convenient when installation connection thus.But the general network video camera only can be realized the purpose of normal monitoring, when in thundery sky or electric power system instability; The phenomenon that big electric current intrusion or voltage fluctuation will occur; Thereby can damage power supply and video, and make video pictures fuzzy, have a strong impact on monitoring effect.The prior art structure is too complicated, and production cost is higher.
Summary of the invention
The purpose of the utility model is: a kind of web camera overvoltage crowbar is provided; Overcome exist in the prior art can not be under induction lightening stream, overvoltage and voltage big ups and downs situation the protecting network video camera; Structure is too complicated, defective that production cost is higher and problem.
For realizing above purpose, the technical solution of the utility model is: a kind of web camera overvoltage crowbar, this voltage protection circuit comprise interconnective power protecting circuit and signal protection circuit; Said power protecting circuit comprises power supply relief tube, piezo-resistance and diode; One end of power supply relief tube is connected with piezo-resistance, diode; The other end of piezo-resistance is connected with light-emitting diode, a resistance wire parallel with one another; The other end of light-emitting diode, resistance wire is connected with power protection resistance, and the other end of power protection resistance is connected with No. two light-emitting diodes, and the other end of No. two light-emitting diodes is connected with an end of power supply relief tube through diode.
Said signal protection circuit comprises signal relief tube, No. two signal relief tubes and signal protection chip; One end of said signal protection chip is connected with an end of a signal relief tube, is connected with the other end of a signal relief tube, is connected with an end of No. two signal relief tubes, is connected with the other end of No. two signal relief tubes through No. four resistance through No. three resistance through No. two resistance through a resistance, and a signal relief tube and No. two signal relief tubes interconnect ground connection.
Compared with prior art; The beneficial effect of the utility model is: because a kind of web camera overvoltage crowbar that is used for of the utility model comprises interconnective Shen source protection circuit and signal protection circuit; Said power protecting circuit is through the common protection of power supply being carried out common mode and differential mode that cooperates with diode of power supply relief tube, piezo-resistance; Thereby guarantee the normal use of voltage protection circuit power supply; Simultaneously can carry out signal prompt through light-emitting diode, said signal protection circuit is realized the divided current to signal circuit through the design of signal relief tube, No. two signal relief tubes and signal protection chip, especially to the control and the video section realization lightning protection of camera; Allomeric function is complete; Can guarantee protecting network video camera under the situation of induction lightening stream, overvoltage and voltage big ups and downs, and simple in structure, be convenient to buy and assembling, production cost is lower.Therefore the utility model not only can be under induction lightening stream, overvoltage and voltage big ups and downs situation the protecting network video camera, and relatively simple for structure, production cost is lower.
Description of drawings
Fig. 1 is the structural representation of power protecting circuit in the utility model.
Fig. 2 is the structural representation of signal protection circuit in the utility model.
Among the figure: power protecting circuit 1, signal protection circuit 2, power supply relief tube 3, piezo-resistance 4; 5, numbers light-emitting diodes 6 of diode, resistance wire 7, power protection resistance 8; 10, No. two signal relief tubes 11 of 9, numbers signal relief tubes of No. two light-emitting diodes, signal protection chip 12; 15, No. four resistance 16 of 14, No. three resistance of 13, No. two resistance of a resistance.
Embodiment
Below in conjunction with description of drawings and embodiment the utility model is done further detailed explanation
Referring to Fig. 1 one Fig. 2, a kind of web camera overvoltage crowbar, this voltage protection circuit comprise interconnective power protecting circuit 1 and signal protection circuit 2; The utility model optimization power supply protective circuit 1 comprises power supply relief tube 3, piezo-resistance 4 and diode 5; One end of power supply relief tube 3 is connected with piezo-resistance 4, diode 5; The other end of piezo-resistance 4 is connected with a light-emitting diode 6, resistance wire 7 parallel with one another; The other end of light-emitting diode 6, resistance wire 7 is connected with power protection resistance 8; The other end of power protection resistance 8 is connected with No. two light-emitting diodes 9, and the other end of No. two light-emitting diodes 9 is connected with an end of power supply relief tube 3 through diode 5.This design not only can be under the situation of induction lightening stream, overvoltage and voltage big ups and downs realizes the common protection of common mode and differential mode to power supply, and can carry out the signal caution through two light-emitting diodes, and is multiple functional, simple in structure.
Preferred signals protective circuit 2 comprises signal relief tube 10, No. two signal relief tubes 11 and signal protection chip 12; One end of said signal protection chip 12 is connected with an end of a signal relief tube 10, is connected with the other end of a signal relief tube 10, is connected with an end of No. two signal relief tubes 11, is connected with the other end of No. two signal relief tubes 11 through No. four resistance 16 through No. three resistance 15 through No. two resistance 14 through a resistance 13, and a signal relief tube 10 and No. two signal relief tubes 11 interconnect ground connection.This design can realize the divided current to signal circuit, especially the control of web camera and video section is realized lightning protection, and not only protectiveness is stronger, and order _ simple in structure, production cost is lower.
Therefore, the utility model not only can be under induction lightening stream, overvoltage and voltage big ups and downs situation the protecting network video camera, and relatively simple for structure, production cost is lower.
The above is merely the preferred embodiments of the utility model; The protection range of the utility model does not exceed with above-mentioned execution mode; As long as the equivalence that those of ordinary skills do according to the utility model institute disclosure is modified or changed, all should include in the protection range of putting down in writing in claims.
Claims (1)
1. web camera overvoltage crowbar; This voltage protection circuit comprises interconnective power protecting circuit and signal protection circuit; It is characterized in that: said power protecting circuit comprises power supply relief tube, piezo-resistance and diode, and an end of power supply relief tube is connected with piezo-resistance, diode, and the other end of piezo-resistance is connected with light-emitting diode, a resistance wire parallel with one another; A light-emitting diode; The other end of resistance wire is connected with power protection resistance, and the other end of power protection resistance is connected with No. two light-emitting diodes, and the other end of No. two light-emitting diodes is connected with an end of power supply relief tube through diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220200341XU CN202550526U (en) | 2012-05-07 | 2012-05-07 | Over-voltage protection circuit of web camera |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220200341XU CN202550526U (en) | 2012-05-07 | 2012-05-07 | Over-voltage protection circuit of web camera |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202550526U true CN202550526U (en) | 2012-11-21 |
Family
ID=47171095
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201220200341XU Expired - Fee Related CN202550526U (en) | 2012-05-07 | 2012-05-07 | Over-voltage protection circuit of web camera |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202550526U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108307117A (en) * | 2018-02-09 | 2018-07-20 | 湖南大学 | Whole audience flash ranging synchronous control device and method |
-
2012
- 2012-05-07 CN CN201220200341XU patent/CN202550526U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108307117A (en) * | 2018-02-09 | 2018-07-20 | 湖南大学 | Whole audience flash ranging synchronous control device and method |
| CN108307117B (en) * | 2018-02-09 | 2020-03-10 | 湖南大学 | Full-field optical measurement multifunctional synchronous control device and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121121 Termination date: 20130507 |