CN205355776U - Short -circuit protection circuit based on power load is unusual - Google Patents
Short -circuit protection circuit based on power load is unusual Download PDFInfo
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- CN205355776U CN205355776U CN201521013323.0U CN201521013323U CN205355776U CN 205355776 U CN205355776 U CN 205355776U CN 201521013323 U CN201521013323 U CN 201521013323U CN 205355776 U CN205355776 U CN 205355776U
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Abstract
The utility model discloses a short -circuit protection circuit based on power load is unusual, include: MCU power control module, mains voltage, resistance, diode and NPN triode. When the unusual short circuit of power output end circuit, the voltage state change of output switches on the base electrode B who feeds back to the triode through zener diode, and control triode realization disconnection is connected with control source EN foot, makes power IC stop work, and protective power supply IC is not burnt out. The utility model relates to a short -circuit protection circuit based on power load is unusual simple structure, low cost, low power dissipation, the response is fast, the reliability is high, have the intellectuality, has applied prospect.
Description
Technical field
This utility model relates to a kind of short-circuit protection circuit, is specifically related to a kind of short-circuit protection circuit abnormal based on power source loads.
Background technology
Circuit design for smart machine; short-circuit protection is one of protection of wherein most critical; when there is short trouble in Circuits System; it is desirable to the quick starting protection in time of short-circuit protection circuit; when automatically terminating again guard mode after failture evacuation; but accomplishing that the short-circuit protection circuit of this point is less, therefore can circuit automatically recover normal operating conditions after failture evacuation is evaluate short-circuit protection circuit reliability, safety and intelligent key factor.
For bus type circuit; prior art is applied most common intelligent connector and is all connected in parallel on a dc bus; it is likely to result in the ground connection of intelligent connector and the situation of big ground short circuit; thus causing whole circuit load too high and burning out; if taking isolated design, increase substantial amounts of cost; therefore, short-circuit protection problems demand during power source loads exception solves.
There is the defects such as structure complexity, cost is high, power consumption is high in the short-circuit protection circuit of prior art, it is impossible to meets the needs of circuit design.And the simple circuit of certain structures, owing to components and parts application is less, the delay phenomenon of short-circuit protection is very serious.
Utility model content
Based on the defect of prior art, this utility model provides a kind of short-circuit protection circuit abnormal based on power source loads, and the composition of described short-circuit protection circuit at least includes: MCU energy supply control module, supply voltage, resistance, diode, audion.
Described audion is NPN audion, and audion base electrode B mono-aspect is connected with the positive pole of diode by protective resistance, is connected with MCU energy supply control module by protective resistance on the other hand.Transistor emitter E ground connection, the EN foot of transistor collector C and power supply IC is connected.
In an embodiment of the present utility model; when power output end circuit abnormality short circuit; the voltage status change of outfan feeds back to the base electrode B of audion by Zener diode conducting; control the connection that audion realizes disconnecting with controlling power supply EN foot; power supply IC is made to quit work, it is achieved the purpose that protection power supply IC is not burned.
Further; described MCU energy supply control module also includes electrical switch, magnetic bead and comparator; when power source loads exception when audion, diode circuit response delay; electrical switch can not normal turn-off, be in conducting state all the time; comparator judges that power supply is in load abnormal state; short-circuit protection circuit to audion, diode composition sends information, and circuit enters short-circuit protection state, controls audion control power supply EN foot and makes power supply IC quit work.When described MCU energy supply control module detects that power source loads recovers; then control electrical switch normal turn-off; comparator judges that power supply is in normal load state; short-circuit protection circuit to audion, diode composition sends information; circuit recovers normal, controls audion control power supply EN foot and makes power supply IC resume work.
Further; the described short-circuit protection circuit abnormal based on power source loads also includes a time delay and keeps module; described time delay keeps module to be arranged between described transistor collector C and the EN foot of power supply IC; its effect is in the stipulated time; keep the on off operating mode of power supply IC, to accomplish being automatically adjusted in load abnormal situation.
Further, described time delay keeps one electric capacity of wired in parallel, one end ground connection of described electric capacity.
Further; the described short-circuit protection circuit abnormal based on power source loads also includes a short-circuit condition testing circuit; described short-circuit condition testing circuit has comparator and potentiometer; for whether there is short circuit phenomenon in real-time detection circuit, the control making the described short-circuit protection circuit abnormal based on power source loads is more accurate, relatively reliable.
Alternatively, the described short-circuit protection circuit abnormal based on power source loads also includes the second short-circuit protection circuit, and described second short-circuit protection circuit includes an audion, diode, a resistance.Described audion base electrode connects the positive pole of described diode and by resistance eutral grounding, and diode cathode connects power input.
This utility model provides the purposes of a kind of short-circuit protection circuit abnormal based on power source loads, and described short-circuit protection circuit, due to its stability and convenience, is applied to car networking arenas, is specifically arranged in the circuit of mobile unit.
The short-circuit protection circuit simple in construction abnormal based on power source loads that this utility model relates to, with low cost, low in energy consumption, response is fast, reliability is high, has intellectuality, has the prospect of application.
Accompanying drawing explanation
Fig. 1 is this utility model embodiment 1 implementation based on the short-circuit protection circuit of power source loads exception.
Detailed description of the invention
Below by specific embodiment, further the technical solution of the utility model is specifically described.Illustrating it should be understood that the following examples are intended only as, and be not intended to scope of the present utility model, apparent change and modification that simultaneously those skilled in the art makes according to this utility model are also contained within this utility model scope.
Embodiment 1
A kind of short-circuit protection circuit abnormal based on power source loads as shown in Figure 1, including: MCU energy supply control module, supply voltage, resistance, diode, audion.Described audion is NPN audion, and audion base electrode B mono-aspect is connected with the positive pole of diode by protective resistance, is connected with MCU energy supply control module by protective resistance on the other hand.Transistor emitter E ground connection, the EN foot of transistor collector C and power supply IC is connected.
When power output end circuit abnormality short circuit; the voltage status change of outfan feeds back to the base electrode B of audion Q3 by Zener diode ZD1 conducting; control the connection that audion realizes disconnecting with controlling power supply EN foot, make power supply IC quit work, it is achieved the purpose that protection power supply IC is not burned.
Embodiment 2
The improvements of the present embodiment and embodiment 1 are: MCU energy supply control module also includes electrical switch, magnetic bead and comparator; when power source loads exception when audion, diode circuit response delay; electrical switch can not normal turn-off, be in conducting state all the time; comparator judges that power supply is in load abnormal state; short-circuit protection circuit to audion, diode composition sends information; circuit enters short-circuit protection state, controls audion control power supply EN foot and makes power supply IC quit work.When described MCU energy supply control module detects that power source loads recovers; then control electrical switch normal turn-off; comparator judges that power supply is in normal load state; short-circuit protection circuit to audion, diode composition sends information; circuit recovers normal; controlling audion control power supply EN foot makes power supply IC resume work, and reaches the purpose of circuit Based Intelligent Control.
Embodiment 3
A kind of circuit of mobile unit; including the short-circuit protection circuit abnormal based on power source loads; except there is MCU energy supply control module, supply voltage, resistance, diode and audion, also there is time delay and keep module, short-circuit condition testing circuit and the second short-circuit protection circuit.
Described time delay keeps one electric capacity of wired in parallel, one end ground connection of described electric capacity.Described short-circuit condition testing circuit has comparator and potentiometer, and for whether there is short circuit phenomenon in real-time detection circuit, the control making the described short-circuit protection circuit abnormal based on power source loads is more accurate, relatively reliable.Described second short-circuit protection circuit includes an audion, diode, a resistance.Described audion base electrode connects the positive pole of described diode and by resistance eutral grounding, and diode cathode connects power input, increases sensitivity and the accuracy of overall short-circuit protection circuit.
Claims (5)
1. the short-circuit protection circuit based on power source loads exception, it is characterised in that: the composition of described short-circuit protection circuit at least includes: MCU energy supply control module, supply voltage, resistance, diode, audion；
Described audion is NPN audion, and audion base electrode B mono-aspect is connected with the positive pole of diode by protective resistance, is connected with MCU energy supply control module by protective resistance on the other hand；Transistor emitter E ground connection, the EN foot of transistor collector C and power supply IC is connected.
2. according to claim 1 based on the short-circuit protection circuit that power source loads is abnormal, it is characterised in that: described MCU energy supply control module also includes electrical switch, magnetic bead and comparator.
3. according to claim 2 based on the short-circuit protection circuit that power source loads is abnormal; it is characterized in that: the described short-circuit protection circuit abnormal based on power source loads also includes a time delay and keep module, described time delay keeps module to be arranged between described transistor collector C and the EN foot of power supply IC.
4. according to claim 3 based on the short-circuit protection circuit that power source loads is abnormal, it is characterised in that: described time delay keeps one electric capacity of wired in parallel, one end ground connection of described electric capacity.
5. according to claim 1 based on the short-circuit protection circuit that power source loads is abnormal; it is characterized in that: the described short-circuit protection circuit abnormal based on power source loads also includes a short-circuit condition testing circuit, and described short-circuit condition testing circuit has comparator and potentiometer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521013323.0U CN205355776U (en) | 2015-12-09 | 2015-12-09 | Short -circuit protection circuit based on power load is unusual |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521013323.0U CN205355776U (en) | 2015-12-09 | 2015-12-09 | Short -circuit protection circuit based on power load is unusual |
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| Publication Number | Publication Date |
|---|---|
| CN205355776U true CN205355776U (en) | 2016-06-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201521013323.0U Active CN205355776U (en) | 2015-12-09 | 2015-12-09 | Short -circuit protection circuit based on power load is unusual |
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| CN (1) | CN205355776U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105322499A (en) * | 2015-12-09 | 2016-02-10 | 江苏天安智联科技股份有限公司 | Short-circuit protection circuit based on power supply load abnormality |
| CN109768523A (en) * | 2019-03-15 | 2019-05-17 | 广州市星翼电子科技有限公司 | A kind of DC power supply output protection circuit of low cost |
-
2015
- 2015-12-09 CN CN201521013323.0U patent/CN205355776U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105322499A (en) * | 2015-12-09 | 2016-02-10 | 江苏天安智联科技股份有限公司 | Short-circuit protection circuit based on power supply load abnormality |
| CN105322499B (en) * | 2015-12-09 | 2018-02-16 | 江苏天安智联科技股份有限公司 | A kind of short-circuit protection circuit abnormal based on power source loads |
| CN109768523A (en) * | 2019-03-15 | 2019-05-17 | 广州市星翼电子科技有限公司 | A kind of DC power supply output protection circuit of low cost |
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