CN205992724U - A kind of power overcurrent protection circuit - Google Patents
A kind of power overcurrent protection circuit Download PDFInfo
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- CN205992724U CN205992724U CN201620868708.3U CN201620868708U CN205992724U CN 205992724 U CN205992724 U CN 205992724U CN 201620868708 U CN201620868708 U CN 201620868708U CN 205992724 U CN205992724 U CN 205992724U
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Abstract
The utility model discloses a kind of power overcurrent protection circuit; including potentiometer RP1, resistance R1, one-way SCR VS, audion VT1 and key switch SB; described resistance R1 one end connects potentiometer RP1 one end, potentiometer RP1 slide plate and power supply VCC respectively; potentiometer RP1 other end connecting triode VT1 emitter stage, audion VT1 colelctor electrode connects the G pole of resistance R2 and one-way SCR VS respectively.This utility model power overcurrent protection circuit; it is controlled using multiple audions cooperation one-way SCR; when overload or short trouble occurring at output end vo and leading to excessively stream; automatically cut off output end vo output, switch SB when needing restoring circuit it is only necessary to push button; easy to use; circuit structure is simple, low cost, is suitable for some equipment not high to control accuracy requirement.
Description
Technical field
This utility model is related to a kind of protection circuit, specifically a kind of power overcurrent protection circuit.
Background technology
Because power-converting device is all operated in high-power environment, excessively stream and short circuit are inevitable, in order to ensure
Power-converting device safely and reliably works, and effective current protection design is necessary, and modern electric converting means all adopts
High-power semiconductor switch device, the current overload ability that it can bear is much lower with respect to rotation converter plant.Existing
Overcurrent protection circuit design varied, some are controlled using PLD although precision is higher, but
Cost is also high.
Utility model content
The purpose of this utility model is to provide a kind of power overcurrent protection circuit of low cost, to solve above-mentioned background skill
The problem proposing in art.
For achieving the above object, this utility model provides following technical scheme：
A kind of power overcurrent protection circuit, including potentiometer RP1, resistance R1, one-way SCR VS, audion VT1 with press
Key switch SB, described resistance R1 one end connects potentiometer RP1 one end, potentiometer RP1 slide plate and power supply VCC, potentiometer RP1 respectively
Other end connecting triode VT1 emitter stage, audion VT1 colelctor electrode connects the G pole of resistance R2 and one-way SCR VS respectively, single
Connect the resistance R1 other end, audion VT1 base stage, diode D1 negative pole, key switch SB, electricity to the A pole of controllable silicon VS respectively
Position device RP2 one end, resistance R6, resistance R7, electric capacity C1 and output end vo, the K pole of one-way SCR VS connects diode D1 respectively
Positive pole, the key switch SB other end and the potentiometer RP2 other end, potentiometer RP2 slide plate connecting triode VT3 base stage, audion
VT3 emitter stage connects the resistance R6 other end and audion VT4 base stage respectively, and it is another that audion VT4 emitter stage connects resistance R7 respectively
One end and audion VT5 base stage, audion VT5 colelctor electrode respectively connecting triode VT4 colelctor electrode, audion VT3 colelctor electrode and
The resistance R2 other end, audion VT5 emitter stage connects the electric capacity C1 other end.
As this utility model further scheme：Described diode D1 is Zener diode.
Compared with prior art, the beneficial effects of the utility model are：This utility model power overcurrent protection circuit, adopts
Multiple audion cooperation one-way SCRs are controlled, when overload or short trouble occurring at output end vo and leading to excessively stream,
Automatically cut off output end vo output, switch SB, easy to use, circuit when needing restoring circuit it is only necessary to push button
Structure is simple, low cost, is suitable for some equipment not high to control accuracy requirement.
Brief description
Fig. 1 is the circuit diagram of power overcurrent protection circuit.
Specific embodiment
Below in conjunction with the accompanying drawing in this utility model embodiment, the technical scheme in this utility model embodiment is carried out
Clearly and completely description is it is clear that described embodiment is only a part of embodiment of this utility model rather than whole
Embodiment.Based on the embodiment in this utility model, those of ordinary skill in the art are not under the premise of making creative work
The every other embodiment being obtained, broadly falls into the scope of this utility model protection.
Refer to Fig. 1, in this utility model embodiment, a kind of power overcurrent protection circuit, including potentiometer RP1, resistance
R1, one-way SCR VS, audion VT1 and key switch SB, described resistance R1 one end connects potentiometer RP1 one end, electricity respectively
Position device RP1 slide plate and power supply VCC, potentiometer RP1 other end connecting triode VT1 emitter stage, audion VT1 colelctor electrode connects respectively
The G pole of connecting resistance R2 and one-way SCR VS, the A pole of one-way SCR VS connects the resistance R1 other end, audion VT1 base respectively
Pole, diode D1 negative pole, key switch SB, potentiometer RP2 one end, resistance R6, resistance R7, electric capacity C1 and output end vo, unidirectional
The K pole of controllable silicon VS connects diode D1 positive pole, the key switch SB other end and the potentiometer RP2 other end, potentiometer RP2 respectively
Slide plate connecting triode VT3 base stage, audion VT3 emitter stage connects the resistance R6 other end and audion VT4 base stage, three poles respectively
Pipe VT4 emitter stage connects the resistance R7 other end and audion VT5 base stage respectively, audion VT5 colelctor electrode connecting triode respectively
VT4 colelctor electrode, audion VT3 colelctor electrode and the resistance R2 other end, audion VT5 emitter stage connects the electric capacity C1 other end；Described
Diode D1 is Zener diode.
Operation principle of the present utility model is：Refer to Fig. 1, in the case of power supply VCC is normal, audion VT1, VT3,
VT4 and VT5 is in cut-off state, output end vo normal output voltage, when overload or short trouble occurring at output end vo,
Pressure drop in detection resistance R1 increases, audion VT1 and one-way SCR VS is toggled and turn on, the voltage stabilizing due to its short circuit
Diode D1, therefore audion VT3, VT4 end, adjustment pipe VT5 conducting, reach the purpose of overcurrent protection.When overload or short
After the Failure elimination of road, to power up to original state, only SR SB need to be pressed.Because button press
Afterwards, the anode-cathode short circuit of one-way SCR VS, therefore one-way SCR VS cut-off.
It is obvious to a person skilled in the art that this 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, this practicality can be realized in other specific forms new
Type.Therefore, no matter from the point of view of which point, embodiment all should be regarded as exemplary, and be nonrestrictive, this practicality is new
The scope of type is limited by claims rather than described above, it is intended that the containing of equivalency that will fall in claim
All changes in justice and scope are included in this utility model.Any reference in claim should not be considered as limiting
Involved claim.
Moreover, it will be appreciated that although this specification is been described by according to embodiment, not each embodiment only wraps
Containing an independent technical scheme, only for clarity, those skilled in the art should for this narrating mode of description
Using description as an entirety, the technical scheme in each embodiment can also form those skilled in the art through appropriately combined
Understandable other embodiment.
Claims (2)
1. a kind of power overcurrent protection circuit, including potentiometer RP1, resistance R1, one-way SCR VS, audion VT1 and button
Switch SB it is characterised in that described resistance R1 one end connects potentiometer RP1 one end, potentiometer RP1 slide plate and power supply VCC respectively,
Potentiometer RP1 other end connecting triode VT1 emitter stage, audion VT1 colelctor electrode connects resistance R2 and one-way SCR respectively
The G pole of VS, the A pole of one-way SCR VS connects the resistance R1 other end, audion VT1 base stage, diode D1 negative pole, button respectively
Switch SB, potentiometer RP2 one end, resistance R6, resistance R7, electric capacity C1 and output end vo, the K pole of one-way SCR VS connects respectively
Diode D1 positive pole, the key switch SB other end and the potentiometer RP2 other end, potentiometer RP2 slide plate connecting triode VT3 base
Pole, audion VT3 emitter stage connects the resistance R6 other end and audion VT4 base stage respectively, and audion VT4 emitter stage connects respectively
The resistance R7 other end and audion VT5 base stage, audion VT5 colelctor electrode connecting triode VT4 colelctor electrode, audion VT3 respectively
Colelctor electrode and the resistance R2 other end, audion VT5 emitter stage connects the electric capacity C1 other end.
2. a kind of power overcurrent protection circuit according to claim 1 is it is characterised in that described diode D1 is voltage stabilizing two
Pole pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620868708.3U CN205992724U (en) | 2016-08-11 | 2016-08-11 | A kind of power overcurrent protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620868708.3U CN205992724U (en) | 2016-08-11 | 2016-08-11 | A kind of power overcurrent protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205992724U true CN205992724U (en) | 2017-03-01 |
Family
ID=58107408
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620868708.3U Expired - Fee Related CN205992724U (en) | 2016-08-11 | 2016-08-11 | A kind of power overcurrent protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205992724U (en) |
-
2016
- 2016-08-11 CN CN201620868708.3U patent/CN205992724U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170301 Termination date: 20180811 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |