CN205544252U - Lightning protection circuit at EOC terminal - Google Patents
Lightning protection circuit at EOC terminal Download PDFInfo
- Publication number
- CN205544252U CN205544252U CN201620124393.1U CN201620124393U CN205544252U CN 205544252 U CN205544252 U CN 205544252U CN 201620124393 U CN201620124393 U CN 201620124393U CN 205544252 U CN205544252 U CN 205544252U
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- circuit
- eoc terminal
- lightning
- lightning protection
- current
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Abstract
At present, the lightning protection measure at the EOC terminal of using on the cable television network comprises electron voltage stabilizing circuit and the piezo -resistor of inside, and during the thunderbolt, piezo -resistor was in case became invalid, and thunder and lightning entering circuit can cause the damage to the electronic circuit in the EOC terminal. The utility model discloses a lightning protection circuit at EOC terminal who designs in order to solve above -mentioned problem, when the EOC terminal receives the thunderbolt, the lightning protection circuit passes through discharge tube GDT with the lightning current, piezo -resistor rz carries out the earial drainage protection, when the heavy current during through the fuse inside fusing realize opening circuit the protection, thereby it plays the effect of avoiding thunder and lightning current rush in protection EOC terminal to make lightning current can not get into the EOC terminal, it plays intuitive judgment lightning protection circuit state's effect to connect in parallel after LED emitting diode and current -limiting resistor establish ties in the lightning protection circuit at the output.
Description
Technical field
This utility model relates to cable TV network technical field, is specifically related to the lightning protection circuit of a kind of EOC terminal.
Background technology
At present, the lightning protection measures of the EOC terminal used on cable TV network is mainly made up of internal electronic regulation circuit and varistor, during thunderbolt, varistor once lost efficacy, thunder and lightning enters circuit can cause damage to the electronic circuit in EOC terminal, even directly damages TV set-top box or the computer equipment being connected with EOC terminal and causes damage user.
Summary of the invention
The purpose of this utility model is the lightning protection circuit of a kind of EOC terminal designed to solve the problems referred to above; when EOC terminal is struck by lightning; lightning current is carried out earial drainage protection by discharge tube GDT, varistor Rz by lightning protection circuit; when big electric current is by fuse, the internal fusing of fuse realizes open circuit protection; so that thunder-strike current can not enter EOC terminal and play the effect that protection EOC terminal is impacted from lightning current, in lightning protection circuit, LED light emitting diode and current-limiting resistance are connected in parallel on outfan after connecting and play the effect of intuitive judgment lightning protection circuit state.
nullThis utility model solves one end that its technical problem the technical scheme is that input IN1 connects fuse FU，LED light emitting diode and current-limiting resistance R are composed in series LED luminescence indicating circuit，Discharge tube GDT、Varistor Rz and LED luminescence indicating circuit is in parallel，Parallel circuit one end is drawn as outfan OUT1 after being connected with the other end of fuse FU，IN2 is connected with public terminal GND and draws as outfan OUT2，OUT1 and OUT2 is connected with the power input of EOC terminal，When having thunder-strike current from input IN1、When IN2 enters circuit，Discharge tube GDT、Varistor Rz is by thunder-strike current earial drainage，When discharge current is more than fuse FU fusing value，Fuse FU fuses，Thus realize the lightning protection purpose to EOC terminal.
The beneficial effects of the utility model are; protected effect is reached by the combination of discharge tube GDT, fuse FU and varistor Rz; play earial drainage or cut off the purpose of circuit; LED light emitting diode and current-limiting resistance are connected in parallel on outfan after being connected in series and play the effect of intuitive judgment lightning protection circuit state, and circuit structure is simple, maintenance cost is low.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of EOC terminal lightning protection circuit described in the utility model.
In figure, each assembly is: 1 fuse FU, 2 discharge tube GDT, 3 varistor Rz, 4 LED light emitting diodes, 5 current-limiting resistance R, EOC terminal.
Detailed description of the invention
In FIG, input IN1 connects one end of fuse FU, LED light emitting diode and current-limiting resistance R are composed in series LED luminescence indicating circuit, discharge tube GDT and varistor Rz is connected in parallel and is connected in parallel with LED luminescence indicating circuit, parallel circuit one end is drawn as outfan OUT1 after being connected with the other end of fuse FU simultaneously, IN2 and public terminal GND are connected and connect to outfan OUT2, OUT1 and OUT2 is connected with the power input of EOC terminal, when having thunder-strike current from input IN1, when IN2 enters circuit, discharge tube GDT, varistor Rz is by thunder-strike current earial drainage, when discharge current is more than fuse FU fusing value, fuse FU fuses, thus realize the lightning protection purpose to EOC terminal.For ensureing lightning protection circuit reliable operation, discharge tube GDT breakdown voltage value takes 380V to 500V, and the magnitude of voltage of varistor Rz takes 280V to 350V.
Technique scheme only embodies the optimal technical scheme of technical solutions of the utility model; some variations that some of which part may be made by those skilled in the art all embody principle of the present utility model, within belonging to protection domain of the present utility model.
Claims (2)
1. the lightning protection circuit of an EOC terminal, it is characterized in that: input IN1 connects one end of fuse FU, LED light emitting diode and current-limiting resistance R are composed in series LED luminescence indicating circuit, it is connected in parallel composition parallel circuit between discharge tube GDT, varistor Rz and described LED luminescence indicating circuit, the other end of described fuse FU and outfan OUT1 connect described parallel circuit, and input IN2 and public terminal GND are connected and connect to outfan OUT2.
The lightning protection circuit of EOC terminal the most according to claim 1, it is characterised in that: LED light emitting diode and current-limiting resistance are connected in parallel on outfan and play and judge lightning protection circuit state effect after being connected in series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620124393.1U CN205544252U (en) | 2016-02-17 | 2016-02-17 | Lightning protection circuit at EOC terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620124393.1U CN205544252U (en) | 2016-02-17 | 2016-02-17 | Lightning protection circuit at EOC terminal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205544252U true CN205544252U (en) | 2016-08-31 |
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ID=56777616
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620124393.1U Active CN205544252U (en) | 2016-02-17 | 2016-02-17 | Lightning protection circuit at EOC terminal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205544252U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106911307A (en) * | 2017-02-22 | 2017-06-30 | 新华三技术有限公司 | Ethernet transmits eoc signal frequency mixer |
| WO2022012638A1 (en) * | 2020-07-16 | 2022-01-20 | 安克创新科技股份有限公司 | Surge protection circuit, lightning protector and electronic device |
-
2016
- 2016-02-17 CN CN201620124393.1U patent/CN205544252U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106911307A (en) * | 2017-02-22 | 2017-06-30 | 新华三技术有限公司 | Ethernet transmits eoc signal frequency mixer |
| WO2022012638A1 (en) * | 2020-07-16 | 2022-01-20 | 安克创新科技股份有限公司 | Surge protection circuit, lightning protector and electronic device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |