CN204697054U - A kind of intercom electromagnetism interference protective circuit - Google Patents
A kind of intercom electromagnetism interference protective circuit Download PDFInfo
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- CN204697054U CN204697054U CN201520405748.XU CN201520405748U CN204697054U CN 204697054 U CN204697054 U CN 204697054U CN 201520405748 U CN201520405748 U CN 201520405748U CN 204697054 U CN204697054 U CN 204697054U
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Abstract
The utility model discloses a kind of intercom electromagnetism interference protective circuit, comprise inductance L 1A, electric capacity C1, inductance L 1B, fuse FU, resistance R1, diode D1, triode Q1 and metal-oxide-semiconductor Q2, electric capacity C1 one end connects input voltage Vi and inductance L 1A respectively, the inductance L 1A other end connects electric capacity C3 respectively, electric capacity C2 and inductance L 2, the electric capacity C2 other end connects inductance L 1B respectively, electric capacity C4 and inductance L 3, the electric capacity C4 other end connects the electric capacity C3 other end and ground connection, the electric capacity C1 other end connects the inductance L 1B other end, inductance L 3 other end is contact resistance R7 respectively, electric capacity C5 and inductance L 4B, inductance L 2 other end connects fuse FU.After input voltage Vi, pole adds the utility model circuit, effectively can prevent the electromagnetic interference that power unit is formed intercom, and the unstable potential safety hazard caused of transient voltage that is energized can be prevented, circuit does not use any chip component, stability is high, and antijamming capability is strong, and circuit structure is simple in addition, volume is little, is applicable to very much promoting the use of.
Description
Technical field
The utility model relates to a kind of anti-electromagnetic interference circuit, specifically a kind of intercom electromagnetism interference protective circuit.
Background technology
Intercom is as a kind of communication tool, and its anti-interference weighs one of important indicator of its quality, and how improving the anti-electromagnetic interference capability of intercom and security performance and reducing intercom volume is the problem that all manufacturers are being studied always.
Utility model content
The purpose of this utility model is the intercom electromagnetism interference protective circuit providing a kind of volume little, to solve the problem proposed in above-mentioned background technology.
For achieving the above object, the utility model provides following technical scheme:
A kind of intercom electromagnetism interference protective circuit, comprises inductance L 1A, electric capacity C1, inductance L 1B, fuse FU, resistance R1, diode D1, triode Q1 and metal-oxide-semiconductor Q2, described electric capacity C1 one end connects input voltage Vi and inductance L 1A respectively, and the inductance L 1A other end connects electric capacity C3 respectively, electric capacity C2 and inductance L 2, the electric capacity C2 other end connects inductance L 1B respectively, electric capacity C4 and inductance L 3, the electric capacity C4 other end connects the electric capacity C3 other end and ground connection, and the described electric capacity C1 other end connects the inductance L 1B other end, and described inductance L 3 other end is contact resistance R7 respectively, electric capacity C5 and inductance L 4B, described inductance L 2 other end connects fuse FU, and the fuse FU other end is the contact resistance R7 other end respectively, the electric capacity C5 other end and inductance L 4A, the inductance L 4A other end is contact resistance R1 respectively, resistance R2, electric capacity C8 and output voltage Vo holds, and the resistance R1 other end connects diode D1 negative pole respectively, resistance R3, resistance R2, electric capacity C6, the G pole of triode Q1 collector electrode and metal-oxide-semiconductor Q2, the S pole contact resistance R4 respectively of metal-oxide-semiconductor Q2, resistance R6, electric capacity C7, diode D1 positive pole, the resistance R3 other end, triode Q1 emitter and the electric capacity C6 other end, the electric capacity C7 other end is the contact resistance R6 other end respectively, the D pole of metal-oxide-semiconductor Q2, resistance R5 and the electric capacity C8 other end ground connection, the resistance R5 other end connects diode D2 negative pole, and diode D2 positive pole is the contact resistance R4 other end and triode Q1 base stage respectively.
As the utility model further scheme: described diode D1 and diode D2 is voltage stabilizing didoe.
Compared with prior art, the beneficial effects of the utility model are: after input voltage Vi, pole adds the utility model circuit, effectively can prevent the electromagnetic interference that power unit is formed intercom, and the unstable potential safety hazard caused of transient voltage that is energized can be prevented, circuit does not use any chip component, and stability is high, antijamming capability is strong, circuit structure is simple in addition, and volume is little, is applicable to very much promoting the use of.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of intercom electromagnetism interference protective circuit.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
Refer to Fig. 1, in the utility model embodiment, a kind of intercom electromagnetism interference protective circuit, comprises inductance L 1A, electric capacity C1, inductance L 1B, fuse FU, resistance R1, diode D1, triode Q1 and metal-oxide-semiconductor Q2, electric capacity C1 one end connects input voltage Vi and inductance L 1A respectively, and the inductance L 1A other end connects electric capacity C3 respectively, electric capacity C2 and inductance L 2, the electric capacity C2 other end connects inductance L 1B respectively, electric capacity C4 and inductance L 3, the electric capacity C4 other end connects the electric capacity C3 other end and ground connection, and the electric capacity C1 other end connects the inductance L 1B other end, and inductance L 3 other end is contact resistance R7 respectively, electric capacity C5 and inductance L 4B, inductance L 2 other end connects fuse FU, and the fuse FU other end is the contact resistance R7 other end respectively, the electric capacity C5 other end and inductance L 4A, the inductance L 4A other end is contact resistance R1 respectively, resistance R2, electric capacity C8 and output voltage Vo holds, and the resistance R1 other end connects diode D1 negative pole respectively, resistance R3, resistance R2, electric capacity C6, the G pole of triode Q1 collector electrode and metal-oxide-semiconductor Q2, the S pole contact resistance R4 respectively of metal-oxide-semiconductor Q2, resistance R6, electric capacity C7, diode D1 positive pole, the resistance R3 other end, triode Q1 emitter and the electric capacity C6 other end, the electric capacity C7 other end is the contact resistance R6 other end respectively, the D pole of metal-oxide-semiconductor Q2, resistance R5 and the electric capacity C8 other end ground connection, the resistance R5 other end connects diode D2 negative pole, and diode D2 positive pole is the contact resistance R4 other end and triode Q1 base stage respectively.
Diode D1 and diode D2 is voltage stabilizing didoe.
Operation principle of the present utility model is: refer to Fig. 1, and the two π type filter network of electric capacity C1, inductance L 1 and electric capacity C2 composition mainly suppresses the electromagnetic noise of input voltage Vi and noise signal, prevents from forming interference to loading section.
Resistance R1, resistance R2, diode D1, metal-oxide-semiconductor Q2 etc. form anti-surge circuit, in the moment of energising, because electric capacity C6 exists, metal-oxide-semiconductor Q2 not conducting, electric current forms loop through resistance R6, when the voltage on electric capacity C6 is charged to the voltage stabilizing value of diode D1, metal-oxide-semiconductor Q2 conducting, if electric capacity C8 leaks electricity or output voltage Vo holds rear pole load circuit to occur short circuit, in the moment of energising, the pressure drop that electric current produces on resistance R1 increases, triode Q1 conducting, metal-oxide-semiconductor Q2 is made not have grid voltage not conducting, resistance R6 will burn within very short time, than pole load circuit after protection.
To those skilled in the art, obvious the utility model is not limited to the details of above-mentioned one exemplary embodiment, and when not deviating from spirit of the present utility model or essential characteristic, can realize the utility model in other specific forms.Therefore, no matter from which point, all should embodiment be regarded as exemplary, and be nonrestrictive, scope of the present utility model is limited by claims instead of above-mentioned explanation, and all changes be therefore intended in the implication of the equivalency by dropping on claim and scope are included in the utility model.Any Reference numeral in claim should be considered as the claim involved by limiting.
In addition, be to be understood that, although this specification is described according to execution mode, but not each execution mode only comprises an independently technical scheme, this narrating mode of specification is only for clarity sake, those skilled in the art should by specification integrally, and the technical scheme in each embodiment also through appropriately combined, can form other execution modes that it will be appreciated by those skilled in the art that.
Claims (2)
1. an intercom electromagnetism interference protective circuit, comprises inductance L 1A, electric capacity C1, inductance L 1B, fuse FU, resistance R1, diode D1, triode Q1 and metal-oxide-semiconductor Q2, is characterized in that, described electric capacity C1 one end connects input voltage Vi and inductance L 1A respectively, and the inductance L 1A other end connects electric capacity C3 respectively, electric capacity C2 and inductance L 2, the electric capacity C2 other end connects inductance L 1B respectively, electric capacity C4 and inductance L 3, the electric capacity C4 other end connects the electric capacity C3 other end and ground connection, and the described electric capacity C1 other end connects the inductance L 1B other end, and described inductance L 3 other end is contact resistance R7 respectively, electric capacity C5 and inductance L 4B, described inductance L 2 other end connects fuse FU, and the fuse FU other end is the contact resistance R7 other end respectively, the electric capacity C5 other end and inductance L 4A, the inductance L 4A other end is contact resistance R1 respectively, resistance R2, electric capacity C8 and output voltage Vo holds, and the resistance R1 other end connects diode D1 negative pole respectively, resistance R3, resistance R2, electric capacity C6, the G pole of triode Q1 collector electrode and metal-oxide-semiconductor Q2, the S pole contact resistance R4 respectively of metal-oxide-semiconductor Q2, resistance R6, electric capacity C7, diode D1 positive pole, the resistance R3 other end, triode Q1 emitter and the electric capacity C6 other end, the electric capacity C7 other end is the contact resistance R6 other end respectively, the D pole of metal-oxide-semiconductor Q2, resistance R5 and the electric capacity C8 other end ground connection, the resistance R5 other end connects diode D2 negative pole, and diode D2 positive pole is the contact resistance R4 other end and triode Q1 base stage respectively.
2. intercom electromagnetism interference protective circuit according to claim 1, is characterized in that, described diode D1 and diode D2 is voltage stabilizing didoe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520405748.XU CN204697054U (en) | 2015-06-14 | 2015-06-14 | A kind of intercom electromagnetism interference protective circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520405748.XU CN204697054U (en) | 2015-06-14 | 2015-06-14 | A kind of intercom electromagnetism interference protective circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204697054U true CN204697054U (en) | 2015-10-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520405748.XU Expired - Fee Related CN204697054U (en) | 2015-06-14 | 2015-06-14 | A kind of intercom electromagnetism interference protective circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204697054U (en) |
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2015
- 2015-06-14 CN CN201520405748.XU patent/CN204697054U/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 |
Granted publication date: 20151007 Termination date: 20160614 |
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| CF01 | Termination of patent right due to non-payment of annual fee |