CN205029314U - Electron podium current foldback circuit - Google Patents
Electron podium current foldback circuit Download PDFInfo
- Publication number
- CN205029314U CN205029314U CN201520733776.4U CN201520733776U CN205029314U CN 205029314 U CN205029314 U CN 205029314U CN 201520733776 U CN201520733776 U CN 201520733776U CN 205029314 U CN205029314 U CN 205029314U
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- China
- Prior art keywords
- triode
- resistance
- foldback circuit
- current foldback
- diode
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Abstract
The utility model discloses an electron podium current foldback circuit, including triode V2, triode V4, resistance R7 and diode D1, resistance R7's one end connecting resistance R2, power VCC, triode V1's projecting pole, triode V2's projecting pole and resistance R5, triode V2's collecting electrode connecting resistance R1, triode V4's base is connected to resistance R1's the other end, and diode D1's positive pole and triode V2's base are connected to resistance R2's the other end. The utility model discloses electron podium current foldback circuit simple structure, components and parts are few, have abandoned traditional sampling resistor form, have the characteristics that the short dot can automatic recovery output after dismantling, want much little than the during operation electric current during protection, even long -time short circuit can not damage the power yet, consequently have the advantage of low, the with low costs and stable performance of quiescent power dissipation.
Description
Technical field
The utility model relates to a kind of current foldback circuit, specifically a kind of Electronic platform current foldback circuit.
Background technology
Along with the progress in epoch and the development of science and technology, with no paper teaching gradually universal and promoting, the development of multimedia education equipment and rapidly, Electronic platform receives the favorable comment of numerous educators as with no paper staple product of educating, its integrated multiple teaching equipment is in one, can provide convenience and realize various instructional function efficiently, and effectively can also carry out remote information interchange and the storage of jumbo data of student and teacher, what avoid in conventional teaching is uninteresting and stiff, make the learning content of student more colorful, Electronic platform is as a kind of electronic device, relatively strict to the requirement of power supply, electric current is crossed conference and is burnt its internal electronic element, especially chip, therefore current foldback circuit seems particularly important, unmarried most of current foldback circuit all uses the method for series resistance to carry out current sampling, want to obtain enough large sampled signal, must the power output of electric consumption, thus increase quiescent dissipation.
Utility model content
The purpose of this utility model is to provide a kind of Electronic platform current foldback circuit, 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 Electronic platform current foldback circuit, comprise triode V2, triode V4, resistance R7 and diode D1, one end contact resistance R2 of described resistance R7, power supply VCC, the emitter of triode V1, the emitter of triode V2 and resistance R5, the collector electrode contact resistance R1 of triode V2, the base stage of the other end connecting triode V4 of resistance R1, the other end of resistance R2 connects the anode of diode D1 and the base stage of triode V2, the collector electrode of the base stage connecting triode V3 of triode V1, but the emitter contact resistance R3 of this V3, the another one point earth of resistance R3, the other end contact resistance R4 of resistance R7, the base stage of electric capacity C1 and triode V3, the negative electrode contact resistance R6 of diode D1, the other end of resistance R6 connects the other end of electric capacity C1, the collector electrode of triode V1 and Electronic platform A, the other end contact resistance R5 of resistance R4 and the collector electrode of triode V4, the grounded emitter of triode V4.
As preferred version of the present utility model: described power supply VCC is 24V direct current.
Compared with prior art; the beneficial effects of the utility model are: the utility model Electronic platform current foldback circuit structure is simple, components and parts are few; abandon traditional sample resistance form; have the advantages that can automatically recover after short dot is removed to export; when comparatively working during protection, electric current is much smaller; even if long-time short circuit, also can not damage power supply, therefore have that quiescent dissipation is low, cost is low and the advantage of stable performance.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of Electronic platform current foldback circuit.
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, a kind of Electronic platform current foldback circuit, comprise triode V2, triode V4, resistance R7 and diode D1, one end contact resistance R2 of described resistance R7, power supply VCC, the emitter of triode V1, the emitter of triode V2 and resistance R5, the collector electrode contact resistance R1 of triode V2, the base stage of the other end connecting triode V4 of resistance R1, the other end of resistance R2 connects the anode of diode D1 and the base stage of triode V2, the collector electrode of the base stage connecting triode V3 of triode V1, but the emitter contact resistance R3 of this V3, the another one point earth of resistance R3, the other end contact resistance R4 of resistance R7, the base stage of electric capacity C1 and triode V3, the negative electrode contact resistance R6 of diode D1, the other end of resistance R6 connects the other end of electric capacity C1, the collector electrode of triode V1 and Electronic platform A, the other end contact resistance R5 of resistance R4 and the collector electrode of triode V4, the grounded emitter of triode V4.
Power supply VCC is 24V direct current.
Operation principle of the present utility model is: when circuit is normal, and V3 is saturated, and V1 is operated in conducting state, so C, E both end voltage of V1 is lower, zener diode D1 can not conducting, therefore V2 cut-off, power supply exports normal.When Electronic platform overcurrent or short circuit for a certain reason, when making the pressure reduction between C, E of V1 be greater than the conduction value of voltage-stabiliser tube D1, the base stage of V2 has electric current to flow through, and V2 transfers conducting to by cut-off, and V4 conducting makes V3, V1 end, power supply no-output.After V1 cut-off, R7 charges to C1, start the next time for V3 and create condition, but when short dot is not also removed, electric current flows into ground through R7, R4, V4, therefore V1 still ends, circuit no-output; If short dot is now removed, the electric current flow through from R7 just flows to the base stage of V3, and V3 conducting, makes V1 normally closed, and circuit exports and recovers normal, and Electronic platform normally works.
Claims (2)
1. an Electronic platform current foldback circuit, comprise triode V2, triode V4, resistance R7 and diode D1, it is characterized in that, one end contact resistance R2 of described resistance R7, power supply VCC, the emitter of triode V1, the emitter of triode V2 and resistance R5, the collector electrode contact resistance R1 of triode V2, the base stage of the other end connecting triode V4 of resistance R1, the other end of resistance R2 connects the anode of diode D1 and the base stage of triode V2, the collector electrode of the base stage connecting triode V3 of triode V1, but the emitter contact resistance R3 of this V3, the another one point earth of resistance R3, the other end contact resistance R4 of resistance R7, the base stage of electric capacity C1 and triode V3, the negative electrode contact resistance R6 of diode D1, the other end of resistance R6 connects the other end of electric capacity C1, the collector electrode of triode V1 and Electronic platform A, the other end contact resistance R5 of resistance R4 and the collector electrode of triode V4, the grounded emitter of triode V4.
2. a kind of Electronic platform current foldback circuit according to claim 1, is characterized in that, described power supply VCC is 24V direct current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520733776.4U CN205029314U (en) | 2015-09-21 | 2015-09-21 | Electron podium current foldback circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520733776.4U CN205029314U (en) | 2015-09-21 | 2015-09-21 | Electron podium current foldback circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205029314U true CN205029314U (en) | 2016-02-10 |
Family
ID=55261818
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520733776.4U Expired - Fee Related CN205029314U (en) | 2015-09-21 | 2015-09-21 | Electron podium current foldback circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205029314U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107591778A (en) * | 2017-10-12 | 2018-01-16 | 南京林洋电力科技有限公司 | A kind of current foldback circuit of self recovery |
-
2015
- 2015-09-21 CN CN201520733776.4U patent/CN205029314U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107591778A (en) * | 2017-10-12 | 2018-01-16 | 南京林洋电力科技有限公司 | A kind of current foldback circuit of self recovery |
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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: 20160210 Termination date: 20160921 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |