CN204578060U - A kind of voltage protection circuit - Google Patents
A kind of voltage protection circuit Download PDFInfo
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- CN204578060U CN204578060U CN201520341378.8U CN201520341378U CN204578060U CN 204578060 U CN204578060 U CN 204578060U CN 201520341378 U CN201520341378 U CN 201520341378U CN 204578060 U CN204578060 U CN 204578060U
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- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 230000001737 promoting effect Effects 0.000 abstract description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
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Abstract
The utility model discloses a kind of voltage protection circuit; comprise chip U1, resistance R1, electric capacity C1, diode D1, fuse FU and inductance L 1; fuse FU one end connects power supply VCC; the fuse FU other end connects diode D1 positive pole; diode D1 negative pole connects the VIN end of diode D2 negative pole, diode D4 negative pole, electric capacity C5, resistance R3 and chip U1 respectively; diode D2 positive pole contact resistance R1, the resistance R1 other end is connecting triode VT1 base stage and resistance R2 respectively.The utility model voltage protection circuit circuit structure is simple, and with overvoltage and under-voltage protection function, cost is low, is applicable to very much promoting the use of.
Description
Technical field
The utility model relates to a kind of protective circuit, specifically a kind of voltage protection circuit.
Background technology
Along with modernization, intelligentized development, electric power becomes the indispensable part of people's life, the stability of electric power is then related to the fail safe of power consumption equipment, a lot of chip component is very responsive to the reaction of voltage, overvoltage or under-voltagely all can cause to it infringement being difficult to retrieve, and along with the development of miniaturization, circuit structure is simplified to the direction becoming various electronic applications.
Utility model content
The purpose of this utility model is to provide a kind of circuit structure simple voltage protection circuit, 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 voltage protection circuit, comprises chip U1, resistance R1, electric capacity C1, diode D1, fuse FU and inductance L 1, described fuse FU one end connects power supply VCC, and the fuse FU other end connects diode D1 positive pole, and diode D1 negative pole connects diode D2 negative pole respectively, diode D4 negative pole, electric capacity C5, the VIN end of resistance R3 and chip U1, diode D2 positive pole contact resistance R1, the resistance R1 other end respectively connecting triode VT1 base stage and resistance R2, the resistance R2 other end connects diode D4 positive pole respectively, triode VT1 emitter, the electric capacity C5 other end, resistance R4, resistance R5, electric capacity C8, the GND end of chip U1, electric capacity C1, electric capacity C2, diode D3 positive pole, electric capacity C3, resistance R8 and electric capacity C4 ground connection, triode VT1 collector electrode is the contact resistance R3 other end respectively, the VIN end of the resistance R4 other end and chip U1, the TR end of chip U1 connects the electric capacity C8 other end, and the RT of chip U1 holds the contact resistance R5 other end, and the boot end of chip U1 connects electric capacity C7, and the electric capacity C7 other end connects the PH end of chip U1 respectively, diode D3 negative pole, the electric capacity C3 other end and inductance L 1, COMP end contact resistance R6 and the electric capacity C2 other end respectively of described chip U1, the resistance R6 other end connects the electric capacity C1 other end, and described inductance L 1 other end is contact resistance R7 respectively, the electric capacity C4 other end and output end vo, the VSNS end of the resistance R7 other end difference contact resistance R8 other end and chip U1.
As further program of the utility model: described chip U1 is power management chip.
As the utility model further scheme: described diode D2 is voltage stabilizing didoe.
Compared with prior art, the beneficial effects of the utility model are: the utility model voltage protection circuit circuit structure is simple, and with overvoltage and under-voltage protection function, cost is low, is applicable to very much promoting the use of.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of voltage protection 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 voltage protection circuit, comprises chip U1, resistance R1, electric capacity C1, diode D1, fuse FU and inductance L 1, fuse FU one end connects power supply VCC, and the fuse FU other end connects diode D1 positive pole, and diode D1 negative pole connects diode D2 negative pole respectively, diode D4 negative pole, electric capacity C5, the VIN end of resistance R3 and chip U1, diode D2 positive pole contact resistance R1, the resistance R1 other end respectively connecting triode VT1 base stage and resistance R2, the resistance R2 other end connects diode D4 positive pole respectively, triode VT1 emitter, the electric capacity C5 other end, resistance R4, resistance R5, electric capacity C8, the GND end of chip U1, electric capacity C1, electric capacity C2, diode D3 positive pole, electric capacity C3, resistance R8 and electric capacity C4 ground connection, triode VT1 collector electrode is the contact resistance R3 other end respectively, the VIN end of the resistance R4 other end and chip U1, the TR end of chip U1 connects the electric capacity C8 other end, and the RT of chip U1 holds the contact resistance R5 other end, and the boot end of chip U1 connects electric capacity C7, and the electric capacity C7 other end connects the PH end of chip U1 respectively, diode D3 negative pole, the electric capacity C3 other end and inductance L 1, COMP end contact resistance R6 and the electric capacity C2 other end respectively of chip U1, the resistance R6 other end connects the electric capacity C1 other end, and inductance L 1 other end is contact resistance R7 respectively, the electric capacity C4 other end and output end vo, the VSNS end of the resistance R7 other end difference contact resistance R8 other end and chip U1.
Chip U1 is power management chip.
Diode D2 is voltage stabilizing didoe.
Operation principle of the present utility model is: refer to Fig. 1; diode D1 plays line reversal protective effect; make when power supply VCC voltage is more than 36V by the resistance arranging resistance R1 and resistance R2; namely triode VT1 is switched on; namely the EN termination of power management chip U1 receives low level voltage; namely power management chip U1 quits work; resistance by arranging resistance R7 and resistance R8 in follow-up voltage control circuit can obtain stable driving voltage making output end vo, and inductance L 1 and electric capacity C4 play filter action.
Made when power supply VCC voltage is lower than 15V by the resistance arranging resistance R3 and resistance R4, power management chip U1 is quit work, and diode D4 plays pressure stabilization function.
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 (3)
1. a voltage protection circuit, comprises chip U1, resistance R1, electric capacity C1, diode D1, fuse FU and inductance L 1, is characterized in that, described fuse FU one end connects power supply VCC, and the fuse FU other end connects diode D1 positive pole, and diode D1 negative pole connects diode D2 negative pole respectively, diode D4 negative pole, electric capacity C5, the VIN end of resistance R3 and chip U1, diode D2 positive pole contact resistance R1, the resistance R1 other end respectively connecting triode VT1 base stage and resistance R2, the resistance R2 other end connects diode D4 positive pole respectively, triode VT1 emitter, the electric capacity C5 other end, resistance R4, resistance R5, electric capacity C8, the GND end of chip U1, electric capacity C1, electric capacity C2, diode D3 positive pole, electric capacity C3, resistance R8 and electric capacity C4 ground connection, triode VT1 collector electrode is the contact resistance R3 other end respectively, the VIN end of the resistance R4 other end and chip U1, the TR end of chip U1 connects the electric capacity C8 other end, and the RT of chip U1 holds the contact resistance R5 other end, and the boot end of chip U1 connects electric capacity C7, and the electric capacity C7 other end connects the PH end of chip U1 respectively, diode D3 negative pole, the electric capacity C3 other end and inductance L 1, COMP end contact resistance R6 and the electric capacity C2 other end respectively of described chip U1, the resistance R6 other end connects the electric capacity C1 other end, and described inductance L 1 other end is contact resistance R7 respectively, the electric capacity C4 other end and output end vo, the VSNS end of the resistance R7 other end difference contact resistance R8 other end and chip U1.
2. voltage protection circuit according to claim 1, is characterized in that, described chip U1 is power management chip.
3. voltage protection circuit according to claim 1, is characterized in that, described diode D2 is voltage stabilizing didoe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520341378.8U CN204578060U (en) | 2015-05-25 | 2015-05-25 | A kind of voltage protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520341378.8U CN204578060U (en) | 2015-05-25 | 2015-05-25 | A kind of voltage protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204578060U true CN204578060U (en) | 2015-08-19 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520341378.8U Expired - Fee Related CN204578060U (en) | 2015-05-25 | 2015-05-25 | A kind of voltage protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204578060U (en) |
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2015
- 2015-05-25 CN CN201520341378.8U patent/CN204578060U/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: 20150819 Termination date: 20160525 |
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| CF01 | Termination of patent right due to non-payment of annual fee |