CN202712835U - Anti-interference circuit for signal transmission - Google Patents
Anti-interference circuit for signal transmission Download PDFInfo
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- CN202712835U CN202712835U CN 201220218247 CN201220218247U CN202712835U CN 202712835 U CN202712835 U CN 202712835U CN 201220218247 CN201220218247 CN 201220218247 CN 201220218247 U CN201220218247 U CN 201220218247U CN 202712835 U CN202712835 U CN 202712835U
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- signal
- signal transmission
- voltage
- capacitor
- input port
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Abstract
The utility model introduces an anti-interference circuit for signal transmission. The anti-interference circuit for signal transmission comprises a signal input port, a signal output port, a bidirectional TVS tube and a capacitor. The bidirectional TVS tube and the capacitor are connected in parallel between the signal output port and the signal input port. A rated voltage of the capacitor is greater than or equal to doubled clamp voltage of the TVS tube. The clamp voltage of the TVS tube is 1.2 to 1.8 times the highest voltage of a signal. According to the utility model, the anti-interference circuit for signal transmission can protect the internal devices of the signal output port and the signal input port from damage, thus system reliability is improved.
Description
Technical field
The utility model relates to a kind of signal transmission technology, particularly a kind of anti-jamming circuit of signal transmission.
Background technology
The signal transmission often runs in electronic equipment, the signal of transmission is take weak signal as main, electromagnetic environment more complicated in the system, the weak signal end can be subject to due to voltage spikes and electrostatic interference, the device withstand voltage of weak signal is lower, may cause weak signal end internal components to damage in actual the use, and this fault has contingency, reduced the reliability of system, the reason in case the difficulty that goes wrong is pinpointed the problems.
Traditional weak signal end does not add interference protection measure or adds low capacity and low withstand voltage capacitor, when signal is subject to the interference voltage of system when larger, still can damage the device of weak signal end inside.
Summary of the invention
Technical problem to be solved in the utility model provides a kind of anti-jamming circuit of signal transmission, and signal is the antijamming capability of weak signal transmission particularly, guard signal internal components, the reliability of raising system.
For the purpose that realizes solving the problems of the technologies described above, the utility model has adopted following technical scheme:
The anti-jamming circuit of a kind of signal transmission comprises signal input port, signal output port, two-way TVS pipe, capacitor, and two-way TVS pipe in parallel and capacitor between the signal input port, signal output port and signal input port directly connect.
Described TVS pipe, i.e. transient voltage twin zener dioder.
Preferred capacitor rated voltage is more than or equal to the clamp voltage twice of TVS pipe.Further concrete, condenser capacity is 2 μ F～4 μ F.
The selection standard of TVS pipe is that clamp voltage is 1.2 ~ 1.8 times of ceiling voltage of applied signal voltage, and the choice criteria of power is more than or equal to 600W.
The anti-jamming circuit of the signal transmission of this patent, its principle and using method are: outside high reject signal absorbs interference voltage in certain scope by the TVS pipe first, and then capacitor can be absorbed in interference signal in the scope of requirement.Thereby finally playing the guard signal output port and be Vin and Vin ground and signal input port is the internal components on Vin1 and Vin1 ground, improves the reliability of system.
By adopting technique scheme, the utlity model has following beneficial effect:
The anti-jamming circuit of the signal of this patent transmission, can the guard signal output port and the signal input port internal components do not damage, increased the reliability of system.
Description of drawings
Fig. 1 is the anti-jamming circuit schematic diagram of signal transmission.
Among the figure, 1 is capacitor, and 2 are the TVS pipe, i.e. transient voltage twin zener dioder, and Vin and Vin ground are signal output port, Vin1 and Vin1 ground are signal input port.
Embodiment
The utility model is described in more detail below in conjunction with accompanying drawing.
The anti-jamming circuit of a kind of signal transmission of this patent as shown in Figure 1,2 and capacitors 1 of a two-way TVS pipe in parallel between signal output port Vin and Vin ground; Outside high reject signal absorbs interference voltage in certain scope by TVS pipe 2 first; then capacitor 1 can be absorbed in interference signal in the scope of requirement; finally play the internal components on guard signal output port Vin and Vin ground and signal input port Vin1 and Vin1 ground, improve the reliability of system.
The choice criteria of capacitor 1 is rated voltage more than or equal to the clamp voltage twice of TVS pipe 2, and capacity need be with too not large, and test shows that 2 μ F～4 μ F effects are relatively good.
The selection standard of TVS pipe 2 is that clamp voltage is 1.2 ~ 1.8 times of signal voltage, and the choice criteria of power is more than or equal to 600W.
The signal of this experiment is 5V signal (TTL), is subject to external interference, and signal output port is that Vin and Vin ground and signal input port are Vin1 and Vin1 ground 1 TVS pipe in parallel and 1 capacitor.After circuit increased anti-jamming circuit, guard signal output port and signal input port internal components did not damage.
Claims (5)
1. the anti-jamming circuit of signal transmission, it is characterized in that: comprise signal input port, signal output port, two-way TVS pipe, capacitor, two-way TVS pipe in parallel and capacitor between the signal input port, signal output port and signal input port directly connect.
2. the anti-jamming circuit of described signal transmission according to claim 1, it is characterized in that: the rated voltage of described capacitor is more than or equal to the clamp voltage twice of TVS pipe.
3. the anti-jamming circuit of described signal transmission according to claim 2, it is characterized in that: described condenser capacity is 2 μ F～4 μ F.
4. the anti-jamming circuit of described signal transmission according to claim 1 is characterized in that: the clamp voltage of described TVS pipe is 1.2～1.8 times of ceiling voltage of applied signal voltage.
5. the anti-jamming circuit of described signal transmission according to claim 1, it is characterized in that: the power of described TVS pipe is greater than 600W.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220218247 CN202712835U (en) | 2012-05-16 | 2012-05-16 | Anti-interference circuit for signal transmission |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220218247 CN202712835U (en) | 2012-05-16 | 2012-05-16 | Anti-interference circuit for signal transmission |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202712835U true CN202712835U (en) | 2013-01-30 |
Family
ID=47593100
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220218247 Expired - Fee Related CN202712835U (en) | 2012-05-16 | 2012-05-16 | Anti-interference circuit for signal transmission |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202712835U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104022496A (en) * | 2014-06-23 | 2014-09-03 | 陕西航空电气有限责任公司 | Protection method for thunder and lightning effect of aviation electrical product |
-
2012
- 2012-05-16 CN CN 201220218247 patent/CN202712835U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104022496A (en) * | 2014-06-23 | 2014-09-03 | 陕西航空电气有限责任公司 | Protection method for thunder and lightning effect of aviation electrical product |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130130 Termination date: 20190516 |