CN206250742U - A kind of output short circuit protection circuit - Google Patents
A kind of output short circuit protection circuit Download PDFInfo
- Publication number
- CN206250742U CN206250742U CN201620853530.5U CN201620853530U CN206250742U CN 206250742 U CN206250742 U CN 206250742U CN 201620853530 U CN201620853530 U CN 201620853530U CN 206250742 U CN206250742 U CN 206250742U
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- China
- Prior art keywords
- relay
- diode
- triode
- resistance
- electric capacity
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Abstract
The utility model discloses a kind of output short circuit protection circuit; including electric capacity C1, resistance R1, diode D1, triode VT1, relay J and diode D2; described electric capacity C1 one end connects output end vo, diode D1 negative poles, relay J coils and resistance R1 respectively; diode D1 positive poles connect relay J coils and triode VT1 colelctor electrodes respectively; triode VT1 grounded emitters; triode VT1 base stages connect resistance R2, and the resistance R2 other ends connect the electric capacity C1 other ends and diode D2 negative poles respectively.The utility model output short circuit protection circuit; at output end vo external loading be short-circuited because of certain reason failure when, equivalent to being shorted, triode VT1 base stages obtain bias voltage to electric capacity C1 by diode D2 and resistance R2; triode VT1 is turned on; relay J adhesives, relay J contact J 1 disconnect, and cut off output end vo voltage; so as to reach the purpose of short-circuit protection; circuit structure is simple, and low cost is safe.
Description
Technical field
The utility model is related to a kind of protection circuit, specifically a kind of output short circuit protection circuit.
Background technology
Be operated in high-power environment due to power-converting device, excessively stream and short circuit be it is inevitable, in order to ensure
Power-converting device safely and reliably works, and effective short-circuit protection design is necessary, and modern electric converting means is used
High-power semiconductor switch device, the current overload ability that it can bear is much lower relative to rotation converter plant.It is existing
Overcurrent protection circuit design it is varied, some are controlled using PLD, although precision is higher, but
Cost is also high, the equipment not high for some required precisions, using PLD control, it is clear that be not best choice.
Utility model content
The purpose of this utility model is to provide a kind of output short circuit protection circuit, to solve to be proposed in above-mentioned background technology
Problem.
To achieve the above object, the utility model provides following technical scheme：
A kind of output short circuit protection circuit, including electric capacity C1, resistance R1, diode D1, triode VT1, relay J and two
Pole pipe D2, described electric capacity C1 one end connects output end vo, diode D1 negative poles, relay J coils and resistance R1, diode respectively
D1 positive poles connect relay J coils and triode VT1 colelctor electrodes, triode VT1 grounded emitters, triode VT1 base stages respectively
Connection resistance R2, the resistance R2 other ends connect the electric capacity C1 other ends and diode D2 negative poles respectively, and diode D2 positive poles connect respectively
Contact relay J contact J-1 and power supply VCC, the relay J contacts J-1 other end connection resistance R1 other ends.
As further program of the utility model：The triode VT1 is NPN triode.
As the utility model further scheme：The relay J contacts J-1 is normally-closed contact.
Compared with prior art, the beneficial effects of the utility model are：The utility model output short circuit protection circuit, output
End Vo places external loading be short-circuited because of certain reason failure when, electric capacity C1 is equivalent to being shorted, and triode VT1 base stages are logical
Cross diode D2 and resistance R2 and obtain bias voltage, triode VT1 conductings, relay J adhesives, relay J contact J-1 disconnect,
Cut-out output end vo voltage, so as to reach the purpose of short-circuit protection, circuit structure is simple, and low cost is safe.
Brief description of the drawings
Fig. 1 is the circuit diagram of output short circuit protection circuit.
Specific embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is carried out
Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of the utility model, rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made
The every other embodiment for being obtained, belongs to the scope of the utility model protection.
Refer to Fig. 1, in the utility model embodiment, a kind of output short circuit protection circuit, including electric capacity C1, resistance R1,
Diode D1, triode VT1, relay J and diode D2, described electric capacity C1 one end connects output end vo, diode D1 respectively
Negative pole, relay J coils and resistance R1, diode D1 positive poles connect relay J coils and triode VT1 colelctor electrodes, three respectively
Pole pipe VT1 grounded emitters, triode VT1 base stages connection resistance R2, the resistance R2 other ends connect respectively the electric capacity C1 other ends and
Diode D2 negative poles, diode D2 positive poles connect relay J contact J-1 and power supply VCC, the relay J contacts J-1 other ends respectively
The connection resistance R1 other ends；The triode VT1 is NPN triode.The relay J contacts J-1 is normally-closed contact.
Operation principle of the present utility model is：Fig. 1 is referred to, when the external loading at output end vo is normal, power supply VCC leads to
Cross resistance R1 and relay J contacts J-1 powering loads, while charge to electric capacity C1, make electric capacity C1 on voltage in it is upper just under
Negative state, triode VT1 base stages cannot be biased, and triode VT1 is in cut-off state；At output end vo external loading because
During the failure that is short-circuited for certain reason, equivalent to being shorted, triode VT1 base stages pass through diode D2 and resistance to electric capacity C1
R2 obtains bias voltage, and triode VT1 conductings, relay J adhesives, relay J contact J-1 disconnect, and cut off output end vo voltage,
So as to reach the purpose of short-circuit protection.
It is obvious to a person skilled in the art that the utility model is not limited to the details of above-mentioned one exemplary embodiment, and
And in the case of without departing substantially from spirit or essential attributes of the present utility model, can in other specific forms realize that this practicality is new
Type.Therefore, no matter from the point of view of which point, embodiment all should be regarded as exemplary, and is nonrestrictive, this practicality is new
The scope of type limits by appended claims rather than described above, it is intended that the equivalency fallen in claim is contained
All changes in justice and scope are included in the utility model.Any reference in claim should not be considered as limitation
Involved claim.
Moreover, it will be appreciated that although the present specification is described in terms of embodiments, not each implementation method is only wrapped
Containing an independent technical scheme, this narrating mode of specification is only that for clarity, those skilled in the art should
Specification an as entirety, the technical scheme in each embodiment can also be formed into those skilled in the art through appropriately combined
May be appreciated other embodiment.
Claims (3)
1. a kind of output short circuit protection circuit, including electric capacity C1, resistance R1, diode D1, triode VT1, relay J and two poles
Pipe D2, it is characterised in that described electric capacity C1 one end connects output end vo, diode D1 negative poles, relay J coils and resistance respectively
R1, diode D1 positive pole connect relay J coils and triode VT1 colelctor electrodes, triode VT1 grounded emitters, three poles respectively
Pipe VT1 base stages connect resistance R2, and the resistance R2 other ends connect the electric capacity C1 other ends and diode D2 negative poles respectively, and diode D2 is just
Pole connects relay J contact J-1 and power supply VCC, the relay J contacts J-1 other end connection resistance R1 other ends respectively.
2. output short circuit protection circuit according to claim 1, it is characterised in that the triode VT1 is the poles of NPN tri-
Pipe.
3. output short circuit protection circuit according to claim 1, it is characterised in that the relay J contacts J-1 is normally closed
Contact.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620853530.5U CN206250742U (en) | 2016-08-08 | 2016-08-08 | A kind of output short circuit protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620853530.5U CN206250742U (en) | 2016-08-08 | 2016-08-08 | A kind of output short circuit protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206250742U true CN206250742U (en) | 2017-06-13 |
Family
ID=58998831
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620853530.5U Expired - Fee Related CN206250742U (en) | 2016-08-08 | 2016-08-08 | A kind of output short circuit protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206250742U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109659896A (en) * | 2019-02-26 | 2019-04-19 | 天津利昂科技发展有限公司 | A kind of equal voltage balancing circuits |
-
2016
- 2016-08-08 CN CN201620853530.5U patent/CN206250742U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109659896A (en) * | 2019-02-26 | 2019-04-19 | 天津利昂科技发展有限公司 | A kind of equal voltage balancing circuits |
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Legal Events
| 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: 20170613 Termination date: 20180808 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |