CN205986136U - Protection device for port misconnection is wrong - Google Patents
Protection device for port misconnection is wrong Download PDFInfo
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- CN205986136U CN205986136U CN201621018762.5U CN201621018762U CN205986136U CN 205986136 U CN205986136 U CN 205986136U CN 201621018762 U CN201621018762 U CN 201621018762U CN 205986136 U CN205986136 U CN 205986136U
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Abstract
The utility model belongs to the technical field of communication technology and specifically relates to a protection device for port misconnection is wrong, including triode Q21, triode Q22, diode D21, diode D22, resistance R21, resistance R22, resistance R23, diode D22's negative pole conduct the first input end and the connection of device resistance R21's one end with triode Q22's collecting electrode, diode D22's positive pole conduct the second input and the connection of device triode Q22's projecting pole with resistance R23's one end, triode Q22's base is connected resistance R23's the other end with resistance R22's one end, resistance R22's the other end is connected triode Q21's collecting electrode, triode Q21's base is connected resistance R21's the other end with diode D21's positive pole, triode Q21's projecting pole is connected diode D21's negative pole and power. The utility model discloses can effectual protection live the residual voltage after the thunderbolt, and under normal condition, not influence communication function.
Description
Technical field
This utility model is related to communication technical field, the wrong preventer of especially a kind of port misconnection.
Background technology
In communication technical field application, telephone line interface and RS232 interface sometimes need to share a port, therefore
Telephone line interface and PC serial ports occur（RS232 interface）The situation of pin short circuit, if being struck by lightning in the case, anti-thunder tube
Residual voltage still have 300V, this voltage can cause to the device of rear end serial ports partial circuit to damage.
Utility model content
In view of this, the purpose of this utility model is the preventer providing a kind of misconnection of port wrong.
This utility model adopts below scheme to realize：A kind of wrong preventer of port misconnection it is characterised in that：Including one
Audion Q21, an audion Q22, a diode D21, a diode D22, a resistance R21, a resistance R22, a resistance R23；
The negative electrode of described diode D22 as the first input end of described device and connects one end of described resistance R21 and described three poles
The colelctor electrode of pipe Q22, the anode of described diode D22 as the second input of described device and connects described audion Q22
Emitter stage and described resistance R23 one end；The base stage of described audion Q22 connects the other end of described resistance R23 and described
One end of resistance R22；The other end of described resistance R22 connects the colelctor electrode of described audion Q21；The base of described audion Q21
Pole connects the other end of described resistance R21 and the anode of described diode D21, and the emitter stage of institute audion Q21 connects described two
The negative electrode of pole pipe D21 and power supply.
In this utility model one embodiment, described audion Q21 model PMBT3906.
In this utility model one embodiment, described audion Q22 model MMBTA42LT1G.
Protection effect of the present utility model is good, can effectively protect the residual voltage after thunderbolt, and under normal circumstances, no
Impact communication function.
Brief description
Fig. 1 is circuit theory diagrams of the present utility model.
Specific embodiment
For making the purpose of this utility model, technical scheme and advantage become more apparent, below will be by specific embodiment
And relevant drawings, this utility model is described in further detail.
This utility model provides a kind of port misconnection wrong preventer, including an audion Q21, an audion Q22, one
Diode D21, a diode D22, a resistance R21, a resistance R22, a resistance R23；The negative electrode of described diode D22 is as institute
State the first input end of device and connect one end of described resistance R21 and the colelctor electrode of described audion Q22, described diode
The anode of D22 as the second input of described device and connects the emitter stage of described audion Q22 and the one of described resistance R23
End；The base stage of described audion Q22 connects the other end of described resistance R23 and one end of described resistance R22；Described resistance R22
The other end connect described audion Q21 colelctor electrode；The base stage of described audion Q21 connects the other end of described resistance R21
With the anode of described diode D21, the negative electrode of the emitter stage described diode D21 of connection of institute audion Q21 and power supply.
As shown in figure 1, this utility model provides a kind of port misconnection wrong preventer, including an audion Q21, one or three
Pole pipe Q22, a diode D21, a diode D22, a resistance R21, a resistance R22, a resistance R23；Described diode D22's
Negative electrode as the first input end Vin1 of described device and connects one end of described resistance R21 and the current collection of described audion Q22
Pole, the anode of described diode D22 as the second input Vin2 of described device and connects the emitter stage of described audion Q22
One end with described resistance R23；The base stage of described audion Q22 connects the other end of described resistance R23 and described resistance R22's
One end；The other end of described resistance R22 connects the colelctor electrode of described audion Q21；The base stage of described audion Q21 connects described
The other end of resistance R21 and the anode of described diode D21, the emitter stage of institute audion Q21 connects the moon of described diode D21
Pole and power supply.In this utility model one embodiment, described audion Q21 model PMBT3906；Described audion Q22 model
For MMBTA42LT1G.
Above-listed preferred embodiment, is further described to the purpose of this utility model, technical scheme and advantage,
Be should be understood that and be the foregoing is only preferred embodiment of the present utility model, not in order to limit this utility model, all
Within spirit of the present utility model and principle, any modification, equivalent substitution and improvement made etc., should be included in this practicality
Within new protection domain.
Claims (3)
1. a kind of wrong preventer of port misconnection it is characterised in that：Including an audion Q21, an audion Q22, one or two poles
Pipe D21, a diode D22, a resistance R21, a resistance R22, a resistance R23；The negative electrode of described diode D22 is as described dress
The first input end put the colelctor electrode of one end of connecting described resistance R21 and described audion Q22, described diode D22's
Anode as the second input of described device and connects the emitter stage of described audion Q22 and one end of described resistance R23；Institute
The base stage stating audion Q22 connects the other end of described resistance R23 and one end of described resistance R22；Described resistance R22's is another
End connects the colelctor electrode of described audion Q21；The base stage of described audion Q21 connects the other end of described resistance R21 and described
The anode of diode D21, the emitter stage of institute audion Q21 connects negative electrode and the power supply of described diode D21.
2. a kind of wrong preventer of port according to claim 1 misconnection it is characterised in that：Described audion Q21 type
Number be PMBT3906.
3. a kind of wrong preventer of port according to claim 1 misconnection it is characterised in that：Described audion Q22 type
Number be MMBTA42LT1G.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621018762.5U CN205986136U (en) | 2016-08-31 | 2016-08-31 | Protection device for port misconnection is wrong |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621018762.5U CN205986136U (en) | 2016-08-31 | 2016-08-31 | Protection device for port misconnection is wrong |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205986136U true CN205986136U (en) | 2017-02-22 |
Family
ID=58039927
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621018762.5U Expired - Fee Related CN205986136U (en) | 2016-08-31 | 2016-08-31 | Protection device for port misconnection is wrong |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205986136U (en) |
-
2016
- 2016-08-31 CN CN201621018762.5U patent/CN205986136U/en not_active Expired - Fee Related
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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: 20170222 Termination date: 20180831 |