CN208707288U - A kind of short-circuit protection circuit - Google Patents
A kind of short-circuit protection circuit Download PDFInfo
- Publication number
- CN208707288U CN208707288U CN201821252926.XU CN201821252926U CN208707288U CN 208707288 U CN208707288 U CN 208707288U CN 201821252926 U CN201821252926 U CN 201821252926U CN 208707288 U CN208707288 U CN 208707288U
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- electrically connected
- short
- circuit
- triode
- field
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The utility model relates to protect field of circuit technology, refer in particular to a kind of short-circuit protection circuit, including voltage conversion circuit, output plug, capacitor C1, triode Q1, resistance R2, processor, field-effect tube Q2 and resistance R4, the end output plug VCC is electrically connected after passing through capacitor C1 with triode Q1 emitter, the end output plug GND is electrically connected with triode Q1 base stage, triode Q1 collector is electrically connected with processor input terminal, triode Q1 emitter is grounded after passing through resistance R2, the end output plug GND is electrically connected with the drain electrode of field-effect tube Q2, field-effect tube Q2 source electrode is grounded after passing through resistance R4, field-effect tube Q2 grid is electrically connected with the first output end of processor, processor second output terminal is electrically connected with voltage conversion circuit control terminal, voltage conversion circuit output end and output The connection of the end plug VCC.The utility model, which can be realized, to be achieved the effect that rapidly to carry out short-circuit protection using lower cost.
Description
Technical field
The utility model relates to protect field of circuit technology, a kind of short-circuit protection circuit is referred in particular to.
Background technique
At present there are two types of the output short circuit protection processing modes of more mouthfuls of adapters, mobile power source.One is by hardware overcurrent
Short-circuit protection chip-in series use the higher cost of overcurrent short-circuit protection chip in output loop, while chip itself
Internal resistance also will increase energy consumption.Another kind is the series current detection resistance in output loop, and by way of analog-to-digital conversion to
MCU inputs testing result, and when detecting that electric current is excessive or short-circuit, MCU controls voltage conversion circuit and closes output.But modulus turns
It is longer the time required to changing, therefore this kind of protected mode reaction is slower, often MCU does not have enough time also closing voltage conversion circuit, uses
The equipment at family has just been burned.
Summary of the invention
The utility model provides that a kind of cost is relatively low and the short-circuit protection of fast response time electricity for problem of the prior art
Road.
The utility model adopts the following technical solution: a kind of short-circuit protection circuit, including voltage conversion circuit, output are inserted
Head, capacitor C1, triode Q1, resistance R2, processor, field-effect tube Q2 and resistance R4, the end VCC of the output plug pass through
It is electrically connected after capacitor C1 with the emitter of the triode Q1, the end GND of the output plug and the base stage of triode Q1 are electrically connected
It connects, the collector of the triode Q1 is electrically connected with the input terminal of the processor, and the emitter of the triode Q1 passes through electricity
It is grounded after resistance R2, the end GND of the output plug is electrically connected with the drain electrode of the field-effect tube Q2, the source of the field-effect tube Q2
Pole is grounded after passing through resistance R4, and the grid of the field-effect tube Q2 is electrically connected with the first output end of processor, the processor
Second output terminal be electrically connected with the control terminal of the voltage conversion circuit, the output end of the voltage conversion circuit with it is described defeated
The end the VCC connection of plug out.
Preferably, the short-circuit protection circuit further includes capacitor C2, the output end of the voltage conversion circuit passes through electricity
It is grounded after holding C2.
Preferably, the short-circuit protection circuit further includes capacitor C3, the input terminal of the voltage conversion circuit passes through electricity
It is grounded after holding C3.
Preferably, the short-circuit protection circuit further includes resistance R3, the end GND of the output plug passes through after resistance R3
It is electrically connected with the base stage of triode Q1.
Preferably, the short-circuit protection circuit further includes diode D1, the anode of the diode D1 and the field are imitated
Should pipe Q2 source electrode electrical connection, the cathode of the diode D1 is electrically connected with the drain electrode of the field-effect tube Q2.
The utility model has the beneficial effects that controlling triode by the characteristic that cannot be mutated using capacitor C1 both end voltage
The on-off of Q1, so that collector level reduction in short circuit with triode Q1, so that the collector electricity with triode Q1
The level of the processor input terminal of connection is set low and is controlled voltage conversion circuit closing, is then realized and is reached using lower cost
To the effect for rapidly carrying out short-circuit protection.
Detailed description of the invention
Fig. 1 is the circuit diagram of the utility model.
Appended drawing reference are as follows: 1-voltage conversion circuit, 2-output plugs, 3-processors.
Specific embodiment
For the ease of the understanding of those skilled in the art, the utility model is made below with reference to embodiment and attached drawing further
Explanation, the content that embodiment refers to not is restriction to the utility model.The utility model is carried out below in conjunction with attached drawing
Detailed description.
As shown in Figure 1, a kind of short-circuit protection circuit, including voltage conversion circuit 1, output plug 2, capacitor C1, triode
Q1, resistance R2, processor 3, field-effect tube Q2 and resistance R4, the end VCC of the output plug 2 by after capacitor C1 with it is described
The emitter of triode Q1 is electrically connected, and the end GND of the output plug 2 is electrically connected with the base stage of triode Q1, the triode
The collector of Q1 is electrically connected with the input terminal of the processor 3, and the emitter of the triode Q1 after resistance R2 by being grounded, institute
The end GND for stating output plug 2 is electrically connected with the drain electrode of the field-effect tube Q2, and the source electrode of the field-effect tube Q2 passes through resistance R4
After be grounded, the grid of the field-effect tube Q2 is electrically connected with the first output end of processor 3, the processor 3 second output
End is electrically connected with the control terminal of the voltage conversion circuit 1, the output end of the voltage conversion circuit 1 and the output plug 2
The end VCC connection.
Output plug 2 is specially USB plug.In normal state, voltage conversion circuit 1 exports 5V voltage, capacitor C1 quilt
Charging, one end that capacitor C1 is connect with the end VCC of output plug 2 is positively charged, capacitor C1 connect with triode Q1 emitter one
It holds negatively charged.Q2 is connected in the first output end output high level of processor 3, and output plug 2 normally exports.Work as output plug
When the GND terminal shortcircuit of 2 end VCC and output plug 2, the voltage that output plug 2 exports declines rapidly, not due to C1 both end voltage
It can be mutated, the emitter voltage of triode Q1 is caused to become negative, simultaneously because field-effect tube Q2 and resistance R4 passes through biggish electricity
Stream, causes the drain voltage of field-effect tube Q2 to increase and is transmitted to the base stage of triode Q1, at this time Vbe > 0.5V of triode Q1,
Triode Q1 conducting, the level of the input terminal of processor 3 are set low, and triggering processor 3 controls voltage conversion circuit 1 and closes and control
Field-effect tube Q2 cut-off processed, achievees the effect that rapidly to carry out short-circuit protection using lower cost to realize.
The DET pin of the input terminal of processor 3 concretely processor 3, the second output terminal of processor 3 are concretely located
The EN pin of device 3 is managed, when short circuit occurs, Q1 interrupts protection by triggering the interrupt routine of processor 3 to trigger.
As shown in Figure 1, the short-circuit protection circuit further includes capacitor C2, the output end of the voltage conversion circuit 1 passes through
It is grounded after capacitor C2.To voltage conversion circuit 1 export signal be filtered so that the output electric current of voltage conversion circuit 1 compared with
It is smooth.
As shown in Figure 1, the short-circuit protection circuit further includes capacitor C3, the input terminal of the voltage conversion circuit 1 passes through
It is grounded after capacitor C3.The input terminal of voltage conversion circuit 1 with AC network for connecting.On the one hand capacitor C3 is able to suppress exchange
The interference signal input voltage switching circuit 1 of power grid, the harmonic wave that on the other hand can prevent voltage conversion circuit 1 from generating when working
With electromagnetic interference AC network.
As shown in Figure 1, the short-circuit protection circuit further includes resistance R3, the end GND of the output plug 2 passes through resistance R3
It is electrically connected afterwards with the base stage of triode Q1, current limliting is carried out by electric current of the resistance R3 to the base stage of input triode Q1, prevents three
Pole pipe Q1 is burned out.
As shown in Figure 1, the short-circuit protection circuit further includes diode D1, the anode of the diode D1 and the field are imitated
Should pipe Q2 source electrode electrical connection, the cathode of the diode D1 is electrically connected with the drain electrode of the field-effect tube Q2, utilizes diode
D1 protects field-effect tube Q2, prevents the overtension between the drain electrode of field-effect tube Q2 and the source electrode of field-effect tube Q2 and leads to field
Effect pipe Q2 is breakdown.
The above is only the utility model preferred embodiment, is not made in any form to the utility model
Limitation, although the utility model is disclosed as above with preferred embodiment, is not intended to limit the utility model, any to be familiar with sheet
Technical professional is not departing within the scope of technical solutions of the utility model, makes when using the technology contents of the disclosure above
A little change or the equivalent embodiment for being modified to equivalent variations, but it is all without departing from the content of the technical scheme of the utility model, foundation
The utility model technology refers to any simple modification, equivalent change and modification to the above embodiments, belongs to practical
In the range of new technique scheme.
Claims (5)
1. a kind of short-circuit protection circuit, it is characterised in that: including voltage conversion circuit (1), output plug (2), capacitor C1, three poles
The end VCC of pipe Q1, resistance R2, processor (3), field-effect tube Q2 and resistance R4, the output plug (2) pass through after capacitor C1
It is electrically connected with the emitter of the triode Q1, the end GND of the output plug (2) is electrically connected with the base stage of triode Q1, institute
The collector for stating triode Q1 is electrically connected with the input terminal of the processor (3), and the emitter of the triode Q1 passes through resistance
It is grounded after R2, the end GND of the output plug (2) is electrically connected with the drain electrode of the field-effect tube Q2, the field-effect tube Q2's
Source electrode is grounded after passing through resistance R4, and the grid of the field-effect tube Q2 is electrically connected with the first output end of processor (3), the place
The second output terminal of reason device (3) is electrically connected with the control terminal of the voltage conversion circuit (1), the voltage conversion circuit (1)
Output end is connect with the end VCC of the output plug (2).
2. a kind of short-circuit protection circuit according to claim 1, it is characterised in that: the short-circuit protection circuit further includes electricity
Hold C2, the output end of the voltage conversion circuit (1) after capacitor C2 by being grounded.
3. a kind of short-circuit protection circuit according to claim 1, it is characterised in that: the short-circuit protection circuit further includes electricity
Hold C3, the input terminal of the voltage conversion circuit (1) after capacitor C3 by being grounded.
4. a kind of short-circuit protection circuit according to claim 1, it is characterised in that: the short-circuit protection circuit further includes electricity
R3 is hindered, the end GND of the output plug (2) after resistance R3 with the base stage of triode Q1 by being electrically connected.
5. a kind of short-circuit protection circuit according to claim 1, it is characterised in that: the short-circuit protection circuit further includes two
Pole pipe D1, the anode of the diode D1 are electrically connected with the source electrode of the field-effect tube Q2, the cathode of the diode D1 and institute
State the drain electrode electrical connection of field-effect tube Q2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821252926.XU CN208707288U (en) | 2018-08-03 | 2018-08-03 | A kind of short-circuit protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821252926.XU CN208707288U (en) | 2018-08-03 | 2018-08-03 | A kind of short-circuit protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208707288U true CN208707288U (en) | 2019-04-05 |
Family
ID=65940493
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821252926.XU Expired - Fee Related CN208707288U (en) | 2018-08-03 | 2018-08-03 | A kind of short-circuit protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208707288U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111864700A (en) * | 2020-07-06 | 2020-10-30 | 深圳市华星光电半导体显示技术有限公司 | Power management circuit and display panel |
| CN114825261A (en) * | 2022-04-26 | 2022-07-29 | 湖南麦格米特电气技术有限公司 | Short-circuit protection circuit, power supply device and electronic device |
-
2018
- 2018-08-03 CN CN201821252926.XU patent/CN208707288U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111864700A (en) * | 2020-07-06 | 2020-10-30 | 深圳市华星光电半导体显示技术有限公司 | Power management circuit and display panel |
| CN111864700B (en) * | 2020-07-06 | 2022-07-12 | 深圳市华星光电半导体显示技术有限公司 | Power management circuit and display panel |
| CN114825261A (en) * | 2022-04-26 | 2022-07-29 | 湖南麦格米特电气技术有限公司 | Short-circuit protection circuit, power supply device and electronic device |
| CN114825261B (en) * | 2022-04-26 | 2024-05-10 | 湖南麦格米特电气技术有限公司 | Short-circuit protection circuit, power supply device and electronic device |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190405 |
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| CF01 | Termination of patent right due to non-payment of annual fee |