CN204216574U - A kind of current foldback circuit of power supply adaptor - Google Patents
A kind of current foldback circuit of power supply adaptor Download PDFInfo
- Publication number
- CN204216574U CN204216574U CN201420727685.5U CN201420727685U CN204216574U CN 204216574 U CN204216574 U CN 204216574U CN 201420727685 U CN201420727685 U CN 201420727685U CN 204216574 U CN204216574 U CN 204216574U
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- output
- power supply
- circuit
- resistance
- supply adaptor
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- 230000003321 amplification Effects 0.000 claims abstract description 9
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 9
- 239000003381 stabilizer Substances 0.000 claims description 8
- 235000013399 edible fruits Nutrition 0.000 abstract 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
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Abstract
The utility model provides a kind of current foldback circuit of power supply adaptor; comprise: sample circuit, signal amplification circuit, comparator and output circuit; described sample circuit is connected with the output of power supply adaptor; the output connection signal amplifying circuit of described sample circuit; the output of described signal amplification circuit connects described comparator, and the output of described comparator is the output of power supply adaptor.The utility model is protected power supply adaptor by arranging current foldback circuit by fruit, prevents the excessive damage causing electronic equipment of output current, improves the reliability of power supply adaptor.
Description
Technical field
The utility model relates to a kind of power supply adaptor, particularly a kind of current foldback circuit of power supply adaptor.
Background technology
Along with the scientific and technological develop rapidly of society, the audio-visual equipment of people's life & amusement also constantly updates the replacement, and the use of various electronic equipment, all be unable to do without power supply adaptor for its charging, power supply adaptor is as modern electronic product equipment, not only its performance will meet power supply unit requirement, autoprotection function also needs to improve, once there is fault in electronic product, if the short circuit of electronic product input or output open circuit, then power supply must close its output voltage, power MOSFET and apparatus of output terminal etc. could be protected not to be burnt, otherwise the further damage of electronic product may be caused, even cause the electric shock and fire etc. of operating personnel.When power output end exceedes nominal load or short circuit, certain damage can be caused to electronic equipment, system cannot normally be worked.
Utility model content
The utility model, for the technical problem of above-mentioned existence, proposes a kind of current foldback circuit of power supply adaptor, by arranging current foldback circuit on power supply adaptor, improves the reliability of power supply adaptor.
The technical solution of the utility model is: a kind of current foldback circuit of power supply adaptor; it is characterized in that; comprise sample circuit, signal amplification circuit, comparator and output circuit; described sample circuit is connected with the output of power supply adaptor; the output connection signal amplifying circuit of described sample circuit; the output of described signal amplification circuit connects described comparator, and the output of described comparator is the output of power supply adaptor.
Further, described sample circuit is made up of resistance R1, resistance R2, voltage-stabiliser tube D1 and electric capacity C1, described sampled signal is converted to voltage signal by resistance R1 and resistance R2 and is connected with one end input of amplifier, described voltage-stabiliser tube D1 and electric capacity C1 is connected in parallel on the output of described resistance R2, other end ground connection.
Further, described output circuit adopts resistance R8, resistance R9, resistance R10, triode Q1, triode Q2 and relay SQ1 forms, the base stage of described triode Q1 is connected with described resistance R9, the collector electrode of described triode Q1 is connected with DC power supply, the collector electrode of described triode Q2 is connected with DC power supply by resistance R8, the base stage of described triode Q2 is connected with the output of described comparator by resistance R10, described triode Q1 is connected with relay with the emitter of triode Q2, the output of described relay is connected with the input power of described power supply adaptor.
The beneficial effects of the utility model: power supply adaptor is protected by arranging current foldback circuit; when the output end current of power supply adaptor is excessive; by the input dump of power source for relay control adapter; thus control output end electric current; prevent the excessive damage causing electronic equipment of output current, improve the reliability of power supply adaptor.
Accompanying drawing explanation
Fig. 1 is the current foldback circuit figure of a kind of power supply adaptor that the utility model proposes.
Embodiment
See Fig. 1, be the current foldback circuit figure of a kind of power supply adaptor that the utility model proposes.
As shown in Figure 1; a kind of current foldback circuit of power supply adaptor; it is characterized in that; comprise: sample circuit, signal amplification circuit, comparator and output circuit; described sample circuit is connected with the output of power supply adaptor; the output connection signal amplifying circuit of described sample circuit, the output of described signal amplification circuit connects described comparator, and the output of described comparator is the output of power supply adaptor.
Described sample circuit is made up of resistance R1, resistance R2, voltage-stabiliser tube D1 and electric capacity C1, described sampled signal is converted to voltage signal by resistance R1 and resistance R2 and is connected with one end input of amplifier, described voltage-stabiliser tube D1 and electric capacity C1 is connected in parallel on the output of described resistance R2, other end ground connection.
Described output circuit adopts resistance R8, resistance R9, resistance R10, triode Q1, triode Q2 and relay SQ1 to form, the base stage of described triode Q1 is connected with described resistance R9, the collector electrode of described triode Q1 is connected with DC power supply, the collector electrode of described triode Q2 is connected with DC power supply by resistance R8, the base stage of described triode Q2 is connected with the output of described comparator by resistance R10, described triode Q1 is connected with relay with the emitter of triode Q2, and the output of described relay is connected with the input power of described power supply adaptor.
Sample circuit is made up of resistance R1, resistance R2, voltage-stabiliser tube D1 and electric capacity C1, and described voltage amplifier circuit is made up of amplifier U1, resistance R3 and resistance R4.Described output circuit adopts triode Q1, triode Q2, with relay SQ1, the current signal of sampling is converted to voltage signal by described resistance R1 and resistance R2, voltage stabilizing and denoising is carried out by voltage-stabiliser tube D1 and electric capacity C1, carrying out amplification by amplifier U1 to voltage outputs in comparator U2, comparator output terminal provides base current for triode Q1 and triode Q2, by triode Q1 and triode Q2, relay is controlled, when the output end current of power supply adaptor is excessive, power source for relay control input disconnects, to cut off the electricity supply the power supply of adapter, realize overcurrent protection.
The utility model is protected power supply adaptor by arranging current foldback circuit; when the output end current of power supply adaptor is excessive; by the input dump of power source for relay control adapter; thus control output end electric current; prevent the excessive damage causing electronic equipment of output current, improve the reliability of power supply adaptor.
Claims (4)
1. the current foldback circuit of a power supply adaptor; it is characterized in that; comprise: sample circuit, signal amplification circuit, comparator and output circuit; described sample circuit is connected with the output of power supply adaptor; the output connection signal amplifying circuit of described sample circuit; the output of described signal amplification circuit connects described comparator, and the output of described comparator is the output of power supply adaptor.
2. the current foldback circuit of a kind of power supply adaptor according to claim 1; it is characterized in that; described sample circuit is made up of resistance R1, resistance R2, voltage-stabiliser tube D1 and electric capacity C1; described sampled signal is converted to voltage signal by resistance R1 and resistance R2 and is connected with one end input of amplifier; described voltage-stabiliser tube D1 and electric capacity C1 is connected in parallel on the output of described resistance R2, other end ground connection.
3. the current foldback circuit of a kind of power supply adaptor according to claim 1, it is characterized in that, described output circuit adopts resistance R8, resistance R9, resistance R10, triode Q1, triode Q2 and relay SQ1 forms, the base stage of described triode Q1 is connected with described resistance R9, the collector electrode of described triode Q1 is connected with DC power supply, the collector electrode of described triode Q2 is connected with DC power supply by resistance R8, the base stage of described triode Q2 is connected with the output of described comparator by resistance R10, described triode Q1 is connected with relay with the emitter of triode Q2, the output of described relay is connected with the input power of described power supply adaptor.
4. the current foldback circuit of a kind of power supply adaptor according to claim 1, is characterized in that, the output of described comparator arranges timer, and described timer carries out delay to the output end signal of comparator and exports.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420727685.5U CN204216574U (en) | 2014-11-28 | 2014-11-28 | A kind of current foldback circuit of power supply adaptor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420727685.5U CN204216574U (en) | 2014-11-28 | 2014-11-28 | A kind of current foldback circuit of power supply adaptor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204216574U true CN204216574U (en) | 2015-03-18 |
Family
ID=52985210
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420727685.5U Expired - Fee Related CN204216574U (en) | 2014-11-28 | 2014-11-28 | A kind of current foldback circuit of power supply adaptor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204216574U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107525997A (en) * | 2017-08-29 | 2017-12-29 | 努比亚技术有限公司 | A kind of USB charging circuits short circuit detection method and power supply adaptor |
| CN109638759A (en) * | 2018-12-24 | 2019-04-16 | 西电通用电气自动化有限公司 | It is a kind of to finely tune the control method and control circuit opened into threshold value based on PWM |
-
2014
- 2014-11-28 CN CN201420727685.5U patent/CN204216574U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107525997A (en) * | 2017-08-29 | 2017-12-29 | 努比亚技术有限公司 | A kind of USB charging circuits short circuit detection method and power supply adaptor |
| CN109638759A (en) * | 2018-12-24 | 2019-04-16 | 西电通用电气自动化有限公司 | It is a kind of to finely tune the control method and control circuit opened into threshold value based on PWM |
| CN109638759B (en) * | 2018-12-24 | 2020-04-21 | 西电通用电气自动化有限公司 | Control method and control circuit based on PWM fine tuning switching threshold |
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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: 20150318 Termination date: 20151128 |