CN204290266U - A kind of current foldback circuit - Google Patents
A kind of current foldback circuit Download PDFInfo
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- CN204290266U CN204290266U CN201420828524.5U CN201420828524U CN204290266U CN 204290266 U CN204290266 U CN 204290266U CN 201420828524 U CN201420828524 U CN 201420828524U CN 204290266 U CN204290266 U CN 204290266U
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Abstract
The utility model provides a kind of current foldback circuit, be connected between power supply and load, comprise power input, over-current detection circuit, protection deadlock circuit, over-current control circuit, power output end, described power input is connected with described over-current detection circuit; Described protection deadlock circuit is connected with described over-current detection circuit, described over-current control circuit respectively; Described over-current control circuit is connected with described power output end; Also comprise anti-clutter circuit, described anti-clutter circuit is connected with described over-current detection circuit, described protection deadlock circuit respectively.The utility model adopts over-current detection circuit, anti-clutter circuit, protection deadlock circuit, over-current control circuit to realize overcurrent protection, and the utility model has the advantages such as antijamming capability is strong, cost is low, the power consumption of overcurrent generation is less.
Description
Technical field
The utility model relates to power circuit design field, particularly relates to a kind of current foldback circuit.
Background technology
Along with the fast development of electron trade, because various use improperly all can cause equipment impaired, especially electric supply system is impaired, and this is the main cause causing equipment to damage.Therefore, damage power supply and load in order to operating current when preventing output short-circuit or transship is excessive, overcurrent protection function is just necessary.The performance quality of current foldback circuit directly affects the reliability of whole equipment and electric supply system; current foldback circuit can output current restriction within the specific limits, be protected whole electric supply system or load when output short-circuit or overload.
But current current foldback circuit exists some problems, the power consumption that such as reliability is lower, overcurrent produces is comparatively large, cost is more high.Relatively more conventional current foldback circuit connects in power output end by Switching Power Supply, when output short-circuit or overload, Switching Power Supply can adopt the mode of interval break-make to realize overcurrent protection, thus fault can be protected to expand, reduce the damaged condition of load, fusible link also can protect the safety of whole electric supply system simultaneously; But the protective circuit of this mode is by the impact of the factors such as input voltage, bearing power, device discreteness, be difficult to debugging to an optimum parameter value, once device parameters is unreasonable, may cause shorten device lifetime or device heating and badly damaged device.
Summary of the invention
The technical problems to be solved in the utility model, is to provide a kind of current foldback circuit, and the utility model adopts over-current detection circuit, anti-clutter circuit, protection deadlock circuit, over-current control circuit to realize overcurrent protection.
The utility model is achieved in that
A kind of current foldback circuit, be connected between power supply and load, comprise power input, over-current detection circuit, protection deadlock circuit, over-current control circuit, power output end, described power input is connected with described over-current detection circuit; Described protection deadlock circuit is connected with described over-current detection circuit, described over-current control circuit respectively; Described over-current control circuit is connected with described power output end.
Further; described over-current detection circuit comprises resistance R1, resistance R2, triode Q1; described power input is connected to after the emitter of described triode Q1 is in parallel with one end of described resistance R1; the base stage of described triode Q1 is connected with described protection deadlock circuit, described over-current control circuit respectively with after the other end parallel connection of described resistance R1; the collector electrode of described triode Q1 is connected with one end of described resistance R2, described protection deadlock circuit respectively, the other end ground connection of described resistance R2.
Further, described protection deadlock circuit comprises resistance R4, resistance R5, resistance R6, resistance R7, resistance R8, resistance R9, triode Q2, triode Q3, triode Q4, is connected respectively after one end parallel connection of one end of described resistance R4, one end of described resistance R7, described resistance R9 with described over-current detection circuit, described over-current control circuit; The collector electrode of described triode Q2 is connected with one end of described resistance R6, the other end of described resistance R4 respectively, and the base stage of described triode Q2 is connected with one end of described resistance R5, described over-current detection circuit respectively, the grounded emitter of described triode Q2; The collector electrode of described triode Q3 is connected with one end of the other end of described resistance R5, described resistance R8, the other end of described resistance R7 respectively, and the base stage of described triode Q3 is connected with the other end of described resistance R6, the grounded emitter of described triode Q3; The collector electrode of described triode Q4 is connected with the other end of described resistance R9, described over-current control circuit respectively, and the base stage of described triode Q4 is connected to the other end of described resistance R8, the grounded emitter of described triode Q3.
Further, described over-current control circuit comprises resistance R11, resistance R12, resistance R13, resistance R14, resistance R15, triode Q5, triode Q6, triode Q7, the base stage of diode D2, described triode Q7 respectively with one end of described resistance R11, one end of described resistance R14 connects, the other end of described resistance R11 is connected to described protection deadlock circuit, the other end ground connection of described resistance R14, the grounded emitter of described triode Q7, the collector electrode of described triode Q7 is connected with one end of described resistance R15, the other end of described resistance R15 respectively with the base stage of described triode Q6, the positive pole of described diode D2, one end of described resistance R13 connects, and is connected to described power output end after the collector electrode of described triode Q6 is in parallel with the collector electrode of described triode Q5, the emitter of described triode Q6 respectively with the base stage of described triode Q5, the negative pole of described diode D2, the other end of described resistance R13, one end of described resistance R12 connects, after the emitter of described triode Q5 is in parallel with the other end of described resistance R12 respectively with described over-current detection circuit, described protection deadlock circuit connects.
Further, also comprise anti-clutter circuit, described anti-clutter circuit is connected with described over-current detection circuit, described protection deadlock circuit respectively.
Further, described anti-clutter circuit comprises voltage stabilizing didoe D1, electric capacity C1, resistance R3, and one end of described resistance R3 is connected with described over-current detection circuit, and the other end of described resistance R3 is connected to the negative pole of described voltage stabilizing didoe D1; The positive pole of described voltage stabilizing didoe D1 is connected with one end of described electric capacity C1, described protection deadlock circuit respectively, the other end ground connection of described electric capacity C1.
The utility model has the advantage of: the power consumption that the utility model antijamming capability is strong, cost is low, overcurrent produces is less.
Accompanying drawing explanation
The utility model is further described with reference to the accompanying drawings in conjunction with the embodiments.
Fig. 1 is the schematic diagram of specific implementation circuit of the present utility model.
Embodiment
Refer to shown in Fig. 1, a kind of current foldback circuit of the present utility model, be connected between power supply and load, comprise power input, over-current detection circuit, protection deadlock circuit, over-current control circuit, power output end, described power supply is connected with described over-current detection circuit by described power input; Described protection deadlock circuit is connected with described over-current detection circuit, described over-current control circuit respectively; Described over-current control circuit is connected with described load by described power output end.
Further, the utility model also comprises anti-clutter circuit, and described anti-clutter circuit is connected with described over-current detection circuit, described protection deadlock circuit respectively.
Wherein, described over-current detection circuit is for detecting the situation of the size of current in described power supply; The interference of described anti-clutter circuit for preventing load from bringing; Described protection deadlock circuit for the protection of described power supply, when load short circuits or overload, described protection deadlock circuit deenergization immediately, thus play the effect of protection; Described over-current control circuit is for controlling the overcurrent in power supply.
The utility model one embodiment is specially:
Vin is power input, Vout is power output end, described over-current detection circuit comprises resistance R1, resistance R2, triode Q1, described anti-clutter circuit comprises voltage stabilizing didoe D1, electric capacity C1, resistance R3, described protection deadlock circuit comprises resistance R4, resistance R5, resistance R6, resistance R7, resistance R8, resistance R9, triode Q2, triode Q3, triode Q4, and described over-current control circuit comprises resistance R11, resistance R12, resistance R13, resistance R14, resistance R15, triode Q5, triode Q6, triode Q7, diode D2;
Described power input is connected to after the emitter of described triode Q1 is in parallel with one end of described resistance R1, the base stage of described triode Q1 is connected with one end of one end of one end of one end of described resistance R4, described resistance R7, described resistance R9, described resistance R12, the emitter of described triode Q5 respectively with after the other end parallel connection of described resistance R1, the collector electrode of described triode Q1 is connected with one end of described resistance R2, one end of described resistance R3 respectively, the other end ground connection of described resistance R2, the other end of described resistance R3 is connected to the negative pole of described voltage stabilizing didoe D1, the positive pole of described voltage stabilizing didoe D1 is connected with the base stage of one end of described electric capacity C1, described triode Q2, one end of described resistance R5 respectively, the other end ground connection of described electric capacity C1, the collector electrode of described triode Q2 is connected with one end of described resistance R6, the other end of described resistance R4 respectively, the grounded emitter of described triode Q2, the collector electrode of described triode Q3 is connected with one end of the other end of described resistance R5, described resistance R8, the other end of described resistance R7 respectively, and the base stage of described triode Q3 is connected with the other end of described resistance R6, the grounded emitter of described triode Q3, the collector electrode of described triode Q4 is connected with the other end of described resistance R9, one end of described resistance R11 respectively, and the base stage of described triode Q4 is connected to the other end of described resistance R8, the grounded emitter of described triode Q3, the base stage of described triode Q7 respectively with one end of described resistance R14, ground connection, the other end of described resistance R11 connects, the other end of described resistance R14 and the equal ground connection of emitter of described triode Q7, the collector electrode of described triode Q7 is connected with one end of described resistance R15, the other end of described resistance R15 respectively with the base stage of described triode Q6, the positive pole of described diode D2, one end of described resistance R1 3 connects, the collector electrode of described triode Q6, be connected with described power output end after the collector electrode parallel connection of described triode Q5, the emitter of described triode Q6 respectively with the base stage of described triode Q5, the negative pole of described diode D2, the other end of described resistance R13, the other end of described resistance R12 connects.
Operation principle of the present utility model is as follows:
When load is normal, during the conduction value of the magnitude of voltage that electric current that resistance R1 flows through produces lower than triode Q1, triode Q1 ends; Resistance R2 level is low, and voltage stabilizing didoe D1 ends; Power supply inlet flow through the BE pole of resistance R4, resistance R6, triode Q3, triode Q3 conducting, resistance R5 no current, the BE pole level of triode Q2 is low, and triode Q2 ends; Triode Q3 conducting, resistance R5 level is low, now pins triode Q2 and makes its remain off; Through the BE pole no-voltage of resistance R8 to triode Q4, triode Q4 ends; The C pole level of triode Q4 is high, to triode Q7, triode Q7 conducting after resistance R11, resistance R14 dividing potential drop; The C pole level of triode Q7 is low, and the BE of triode Q6 is extremely logical, therefore triode Q6 conducting; The BE of triode Q5 is extremely logical, therefore triode Q5 conducting, Vout output voltage, circuit is in normal operating conditions.
When load abnormal short circuit, it is poor that resistance R1 produces certain voltage, makes the BE of triode Q1 extremely logical, therefore triode Q1 conducting; Resistance R2 level is high, voltage stabilizing didoe pipe D1 conducting, and now level is high, and the BE of triode Q2 leads to, triode Q2 conducting; The C pole level of triode Q2 is low, and resistance R6 level is low, and the BE of triode Q3 is extremely obstructed, and triode Q3 ends; The C pole level of triode Q3 is high, and resistance R5 level is high, now pins triode Q2 and makes it keep conducting; Resistance R8 level is high, and the BE of triode Q4 is extremely logical, triode Q4 conducting; The C pole level of triode Q4 is low, and resistance R11 and resistance R14 divides and forces down, and the BE of triode Q7 is extremely obstructed, and triode Q7 ends; The C pole level of triode Q7 is high, and the BE of triode Q6 is extremely obstructed, and triode Q6 ends; The BE of triode Q5 is extremely obstructed, and triode Q5 ends, and Vout does not have voltage to export, and circuit is in overcurrent protection state, and before protection, level power supply does not burn out.
When there being extraneous interference; electric capacity C1 charges, and during underfill, capacitance voltage does not rise to the conducting voltage of triode Q2; triode Q2 ends; when being full of, the voltage rise of electric capacity C1 to the conducting voltage of triode Q2, triode Q2 conducting; capacitor discharge after interference disappears; the process of electric capacity C1 charge and discharge is the interference in order to prevent the electric current in outer bound pair circuit, does not affect protection deadlock circuit, and the operating state of protection deadlock circuit is constant.
Although the foregoing describe embodiment of the present utility model; but be familiar with those skilled in the art to be to be understood that; specific embodiment described by us is illustrative; instead of for the restriction to scope of the present utility model; those of ordinary skill in the art, in the modification of the equivalence done according to spirit of the present utility model and change, should be encompassed in scope that claim of the present utility model protects.
Claims (6)
1. a current foldback circuit, is connected between power supply and load, it is characterized in that: comprise power input, over-current detection circuit, protection deadlock circuit, over-current control circuit, power output end, described power input is connected with described over-current detection circuit; Described protection deadlock circuit is connected with described over-current detection circuit, described over-current control circuit respectively; Described over-current control circuit is connected with described power output end.
2. a kind of current foldback circuit as claimed in claim 1; it is characterized in that: described over-current detection circuit comprises resistance R1, resistance R2, triode Q1; described power input is connected to after the emitter of described triode Q1 is in parallel with one end of described resistance R1; the base stage of described triode Q1 is connected with described protection deadlock circuit, described over-current control circuit respectively with after the other end parallel connection of described resistance R1; the collector electrode of described triode Q1 is connected with one end of described resistance R2, described protection deadlock circuit respectively, the other end ground connection of described resistance R2.
3. a kind of current foldback circuit as claimed in claim 1, it is characterized in that: described protection deadlock circuit comprises resistance R4, resistance R5, resistance R6, resistance R7, resistance R8, resistance R9, triode Q2, triode Q3, triode Q4, be connected with described over-current detection circuit, described over-current control circuit respectively after one end parallel connection of one end of described resistance R4, one end of described resistance R7, described resistance R9; The collector electrode of described triode Q2 is connected with one end of described resistance R6, the other end of described resistance R4 respectively, and the base stage of described triode Q2 is connected with one end of described resistance R5, described over-current detection circuit respectively, the grounded emitter of described triode Q2; The collector electrode of described triode Q3 is connected with one end of the other end of described resistance R5, described resistance R8, the other end of described resistance R7 respectively, and the base stage of described triode Q3 is connected with the other end of described resistance R6, the grounded emitter of described triode Q3; The collector electrode of described triode Q4 is connected with the other end of described resistance R9, described over-current control circuit respectively, and the base stage of described triode Q4 is connected to the other end of described resistance R8, the grounded emitter of described triode Q3.
4. a kind of current foldback circuit as claimed in claim 1, is characterized in that: described over-current control circuit comprises resistance R11, resistance R12, resistance R13, resistance R14, resistance R15, triode Q5, triode Q6, triode Q7, the base stage of diode D2, described triode Q7 respectively with one end of described resistance R11, one end of described resistance R14 connects, the other end of described resistance R11 is connected to described protection deadlock circuit, the other end ground connection of described resistance R14, the grounded emitter of described triode Q7, the collector electrode of described triode Q7 is connected with one end of described resistance R15, the other end of described resistance R15 respectively with the base stage of described triode Q6, the positive pole of described diode D2, one end of described resistance R13 connects, and is connected to described power output end after the collector electrode of described triode Q6 is in parallel with the collector electrode of described triode Q5, the emitter of described triode Q6 respectively with the base stage of described triode Q5, the negative pole of described diode D2, the other end of described resistance R13, one end of described resistance R12 connects, after the emitter of described triode Q5 is in parallel with the other end of described resistance R12 respectively with described over-current detection circuit, described protection deadlock circuit connects.
5. a kind of current foldback circuit as claimed in claim 1, is characterized in that: also comprise anti-clutter circuit, and described anti-clutter circuit is connected with described over-current detection circuit, described protection deadlock circuit respectively.
6. a kind of current foldback circuit as claimed in claim 5, it is characterized in that: described anti-clutter circuit comprises voltage stabilizing didoe D1, electric capacity C1, resistance R3, one end of described resistance R3 is connected with described over-current detection circuit, and the other end of described resistance R3 is connected to the negative pole of described voltage stabilizing didoe D1; The positive pole of described voltage stabilizing didoe D1 is connected with one end of described electric capacity C1, described protection deadlock circuit respectively, the other end ground connection of described electric capacity C1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420828524.5U CN204290266U (en) | 2014-12-24 | 2014-12-24 | A kind of current foldback circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420828524.5U CN204290266U (en) | 2014-12-24 | 2014-12-24 | A kind of current foldback circuit |
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| CN204290266U true CN204290266U (en) | 2015-04-22 |
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| CN201420828524.5U Active CN204290266U (en) | 2014-12-24 | 2014-12-24 | A kind of current foldback circuit |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106953297A (en) * | 2017-05-26 | 2017-07-14 | 青岛东软载波科技股份有限公司 | A kind of protection circuit |
| CN107069651A (en) * | 2017-03-28 | 2017-08-18 | 深圳市振华微电子有限公司 | Current foldback circuit, overcurrent protector and current foldback circuit forming method |
| 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 |
| CN108829170A (en) * | 2018-07-11 | 2018-11-16 | 深圳开立生物医疗科技股份有限公司 | A kind of linear voltage-stabilizing circuit with overcurrent protection |
| CN108829170B (en) * | 2018-07-11 | 2024-04-16 | 深圳开立生物医疗科技股份有限公司 | Linear voltage stabilizing circuit with overcurrent protection |
-
2014
- 2014-12-24 CN CN201420828524.5U patent/CN204290266U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107069651A (en) * | 2017-03-28 | 2017-08-18 | 深圳市振华微电子有限公司 | Current foldback circuit, overcurrent protector and current foldback circuit forming method |
| CN106953297A (en) * | 2017-05-26 | 2017-07-14 | 青岛东软载波科技股份有限公司 | A kind of protection circuit |
| CN106953297B (en) * | 2017-05-26 | 2020-03-10 | 青岛东软载波科技股份有限公司 | Protective circuit |
| 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 |
| CN108829170A (en) * | 2018-07-11 | 2018-11-16 | 深圳开立生物医疗科技股份有限公司 | A kind of linear voltage-stabilizing circuit with overcurrent protection |
| CN108829170B (en) * | 2018-07-11 | 2024-04-16 | 深圳开立生物医疗科技股份有限公司 | Linear voltage stabilizing circuit with overcurrent protection |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: Overcurrent protection circuit Effective date of registration: 20200416 Granted publication date: 20150422 Pledgee: China Everbright Bank Limited by Share Ltd. Xiamen branch Pledgor: FUJIAN QSA INTELLIGENCE Co.,Ltd. Registration number: Y2020350000015 |
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| PC01 | Cancellation of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20220804 Granted publication date: 20150422 Pledgee: China Everbright Bank Limited by Share Ltd. Xiamen branch Pledgor: FUJIAN QSA INTELLIGENCE CO.,LTD. Registration number: Y2020350000015 |