CN204835924U - Step -down power adapter - Google Patents
Step -down power adapter Download PDFInfo
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- CN204835924U CN204835924U CN201520541492.5U CN201520541492U CN204835924U CN 204835924 U CN204835924 U CN 204835924U CN 201520541492 U CN201520541492 U CN 201520541492U CN 204835924 U CN204835924 U CN 204835924U
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- 239000004065 semiconductor Substances 0.000 claims description 12
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
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Abstract
The utility model discloses a step -down power adapter, including diode VD1, triode VT2, MOS manages VT1, resistance R1, electric capacity C1, A1 is put to inductance L1 and fortune, MOS pipe VT1's the D utmost point VCC that connects respectively, resistance R8, electric capacity C2 and diode VD4 are anodal, diode VD1 negative pole is connected respectively to the resistance R8 other end and the A1 power end is put to fortune, ground connection diode VD2 negative pole is connected respectively to diode VD1 positive pole, the A1 earthing terminal is put to resistance R7 and fortune, grounded capacitance C1 and resistance R11 are connected respectively to the resistance R7 other end. The utility model discloses step -down power adapter does not use chip element control, and circuit structure is simple, and is with low costs, and diode VD8 and diode VD9 are added to inductance L1 one end, and the spike voltage clamper that inductance L1 produced because of the leakage inductance is to safe worth, improved circuit's stability, especially adapted using widely.
Description
Technical field
The utility model relates to a kind of power supply adaptor, specifically a kind of voltage dropping power supply adapter.
Background technology
Voltage dropping power supply adapter is that fixing alternating voltage is transformed into variable direct voltage, converts also referred to as DC-DC.DC-DC conversion utilizes modern power electronics technology, and the time ratio of control switch transistor ON and shutoff maintains a kind of power supply of regulated output voltage.DC-DC converts the direction that high frequency is its development, and high frequency makes DC-DC convert and enters application widely, particularly in the application of high-technology field, has promoted the miniaturization of new high-tech product, lighting.How guarantee is stable export while, reduce DC-DC and convert volume, alleviate its weight, become the direction of research in industry, existing a lot of DC-DC conversion all adopts chip UC3845A to control, and complex structure, antijamming capability is weak.
Utility model content
The purpose of this utility model is the voltage dropping power supply adapter 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 voltage dropping power supply adapter, comprise diode VD1, triode VT2, metal-oxide-semiconductor VT1, resistance R1, electric capacity C1, inductance L 1 and amplifier A1, the D pole of described metal-oxide-semiconductor VT1 connects power supply VCC respectively, resistance R8, electric capacity C2 and diode VD4 positive pole, the resistance R8 other end connects diode VD1 negative pole and amplifier A1 power end respectively, diode VD1 positive pole connects ground connection diode VD2 negative pole respectively, resistance R7 and amplifier A1 earth terminal, the resistance R7 other end connects ground capacity C1 and resistance R11 respectively, the resistance R11 other end connects electric capacity C5 and amplifier A1 end of oppisite phase respectively, the electric capacity C5 other end connects output end vo and resistance R2 respectively, the resistance R2 other end is contact resistance R12 respectively, diode VD8 positive pole and inductance L 1, diode VD8 negative pole connects ground connection diode VD9 negative pole, inductance L 1 other end connects ground connection diode VD5 negative pole respectively, the S pole of metal-oxide-semiconductor VT1 and electric capacity C7, the described resistance R12 other end connects amplifier A1 in-phase end and resistance R1 respectively, the resistance R1 other end connects electric capacity C3 respectively, the output of diode VD3 negative pole and amplifier A1, diode VD3 positive pole contact resistance R10, the resistance R10 other end connects the electric capacity C3 other end and triode VT2 base stage respectively, triode VT2 grounded emitter, triode VT2 collector electrode connects the G pole of metal-oxide-semiconductor VT1 respectively, resistance R4 and triode VT3 collector electrode, the resistance R4 other end connects the electric capacity C7 other end and resistance R3 respectively, the resistance R3 other end connects diode VD4 negative pole, described triode VT3 grounded emitter, triode VT3 base stage connects diode VD6 negative pole, diode VD6 positive pole connects earth resistance R6 respectively, ground connection diode VD7 negative pole and resistance R5, the resistance R5 other end connects the electric capacity C2 other end.
As further program of the utility model: described diode VD9 is voltage stabilizing didoe.
As further program of the utility model: described amplifier A1 adopts LM324.
As the utility model further scheme: described power supply VCC is the direct current that 220V electric main obtains through rectification step-down.
Compared with prior art, the beneficial effects of the utility model are: the utility model voltage dropping power supply adapter does not use chip component to control, circuit structure is simple, cost is low, inductance L 1 one end adds diode VD8 and diode VD9, the peak voltage clamper that inductance L 1 produces because of leakage inductance, to safety value, improves the stability of circuit, is applicable to very much promoting the use of.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of voltage dropping power supply adapter.
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 dropping power supply adapter, comprise diode VD1, triode VT2, metal-oxide-semiconductor VT1, resistance R1, electric capacity C1, inductance L 1 and amplifier A1, the D pole of metal-oxide-semiconductor VT1 connects power supply VCC respectively, resistance R8, electric capacity C2 and diode VD4 positive pole, the resistance R8 other end connects diode VD1 negative pole and amplifier A1 power end respectively, diode VD1 positive pole connects ground connection diode VD2 negative pole respectively, resistance R7 and amplifier A1 earth terminal, the resistance R7 other end connects ground capacity C1 and resistance R11 respectively, the resistance R11 other end connects electric capacity C5 and amplifier A1 end of oppisite phase respectively, the electric capacity C5 other end connects output end vo and resistance R2 respectively, the resistance R2 other end is contact resistance R12 respectively, diode VD8 positive pole and inductance L 1, diode VD8 negative pole connects ground connection diode VD9 negative pole, inductance L 1 other end connects ground connection diode VD5 negative pole respectively, the S pole of metal-oxide-semiconductor VT1 and electric capacity C7, the resistance R12 other end connects amplifier A1 in-phase end and resistance R1 respectively, the resistance R1 other end connects electric capacity C3 respectively, the output of diode VD3 negative pole and amplifier A1, diode VD3 positive pole contact resistance R10, the resistance R10 other end connects the electric capacity C3 other end and triode VT2 base stage respectively, triode VT2 grounded emitter, triode VT2 collector electrode connects the G pole of metal-oxide-semiconductor VT1 respectively, resistance R4 and triode VT3 collector electrode, the resistance R4 other end connects the electric capacity C7 other end and resistance R3 respectively, the resistance R3 other end connects diode VD4 negative pole, triode VT3 grounded emitter, triode VT3 base stage connects diode VD6 negative pole, diode VD6 positive pole connects earth resistance R6 respectively, ground connection diode VD7 negative pole and resistance R5, the resistance R5 other end connects the electric capacity C2 other end.
Diode VD9 is voltage stabilizing didoe.
Amplifier A1 adopts LM324.
Power supply VCC is the direct current that 220V electric main obtains through rectification step-down.
Operation principle of the present utility model is: refer to Fig. 1, and amplifier A1 adds positive feedback and vibrates, and its frequency of oscillation is determined by coil L1 and positive feedback resistor R1.Switch element VT1 adopts power MOSFET tube, when VT1 ends, the reverse voltage that coil L1 responds to passes through fly-wheel diode VD5 from output end vo supply load, output voltage is added to the in-phase input end of A1 by R2, and compare with the 5V reference voltage being added in its anti-phase defeated large end, amplifier A1 exports by VT2 control VT1 conducting or cut-off, when the peak value of output voltage is more than 6V, the overvoltage detection circuit action of the element compositions such as VT2, makes VT1 reliably end.
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 (4)
1. a voltage dropping power supply adapter, comprise diode VD1, triode VT2, metal-oxide-semiconductor VT1, resistance R1, electric capacity C1, inductance L 1 and amplifier A1, it is characterized in that, the D pole of described metal-oxide-semiconductor VT1 connects power supply VCC respectively, resistance R8, electric capacity C2 and diode VD4 positive pole, the resistance R8 other end connects diode VD1 negative pole and amplifier A1 power end respectively, diode VD1 positive pole connects ground connection diode VD2 negative pole respectively, resistance R7 and amplifier A1 earth terminal, the resistance R7 other end connects ground capacity C1 and resistance R11 respectively, the resistance R11 other end connects electric capacity C5 and amplifier A1 end of oppisite phase respectively, the electric capacity C5 other end connects output end vo and resistance R2 respectively, the resistance R2 other end is contact resistance R12 respectively, diode VD8 positive pole and inductance L 1, diode VD8 negative pole connects ground connection diode VD9 negative pole, inductance L 1 other end connects ground connection diode VD5 negative pole respectively, the S pole of metal-oxide-semiconductor VT1 and electric capacity C7, the described resistance R12 other end connects amplifier A1 in-phase end and resistance R1 respectively, the resistance R1 other end connects electric capacity C3 respectively, the output of diode VD3 negative pole and amplifier A1, diode VD3 positive pole contact resistance R10, the resistance R10 other end connects the electric capacity C3 other end and triode VT2 base stage respectively, triode VT2 grounded emitter, triode VT2 collector electrode connects the G pole of metal-oxide-semiconductor VT1 respectively, resistance R4 and triode VT3 collector electrode, the resistance R4 other end connects the electric capacity C7 other end and resistance R3 respectively, the resistance R3 other end connects diode VD4 negative pole, described triode VT3 grounded emitter, triode VT3 base stage connects diode VD6 negative pole, diode VD6 positive pole connects earth resistance R6 respectively, ground connection diode VD7 negative pole and resistance R5, the resistance R5 other end connects the electric capacity C2 other end.
2. voltage dropping power supply adapter according to claim 1, is characterized in that, described diode VD9 is voltage stabilizing didoe.
3. voltage dropping power supply adapter according to claim 1, is characterized in that, described amplifier A1 adopts LM324.
4. voltage dropping power supply adapter according to claim 1, is characterized in that, described power supply VCC is the direct current that 220V electric main obtains through rectification step-down.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520541492.5U CN204835924U (en) | 2015-07-24 | 2015-07-24 | Step -down power adapter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520541492.5U CN204835924U (en) | 2015-07-24 | 2015-07-24 | Step -down power adapter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204835924U true CN204835924U (en) | 2015-12-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520541492.5U Expired - Fee Related CN204835924U (en) | 2015-07-24 | 2015-07-24 | Step -down power adapter |
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| Country | Link |
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| CN (1) | CN204835924U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113783170A (en) * | 2021-09-13 | 2021-12-10 | 成都新欣神风电子科技有限公司 | A high-reliability surge voltage suppression method |
-
2015
- 2015-07-24 CN CN201520541492.5U patent/CN204835924U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113783170A (en) * | 2021-09-13 | 2021-12-10 | 成都新欣神风电子科技有限公司 | A high-reliability surge voltage suppression method |
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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: 20151202 Termination date: 20170724 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |