CN207410010U - A kind of self-locking protective circuit - Google Patents
A kind of self-locking protective circuit Download PDFInfo
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- CN207410010U CN207410010U CN201721441240.0U CN201721441240U CN207410010U CN 207410010 U CN207410010 U CN 207410010U CN 201721441240 U CN201721441240 U CN 201721441240U CN 207410010 U CN207410010 U CN 207410010U
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Abstract
The utility model discloses a kind of self-locking protective circuits, by the way that metal-oxide-semiconductor is controlled to power to electrical appliance, the break-make of feedback control signal control metal-oxide-semiconductor is fed by feedback control end, realize cut-out electrical appliance power supply, loop control is formed by the switching effect of three triodes and realizes self-lock protection function, keep electrical appliance off state, circuit is avoided to restart problem repeatedly when problem does not solve, simultaneously after circuit problem is solved again after power-on and power-off, bio-occlusion electrical appliance is powered, substantially increase the security of circuit, electrical appliance circuit board life and reliability has been effectively ensured, ensure the safety of electrical appliance, it is at low cost, it arranges in pairs or groups suitable for the protection circuit of various electronic products, greatly reduce the risk of electronic device damage, the quality of electronic product has been effectively ensured, safety and reliability.
Description
Technical field
The utility model belongs to circuit protection technical field, is related to a kind of protection circuit, is specifically a kind of self-lock protection electricity
Road.
Background technology
With the development of electronic technology, electronic device applications are in all trades and professions, in face of various harsh working environments, to electricity
The protection on road is particularly important.If electronic device goes wrong at work, without protecting circuit work, electronics will result in
Device lifetime security reduces or directly damage is burnt, and causes incalculable damage.Thus in order to ensure the peace of electronic device
Full property and reliability, one kind are effectively protected circuit and are very important.
Due to the use environment of various complexity, it is more than device sheet that electronic device can inevitably be encountered harsh in use
The specified operating condition of body or human operational error, and may will generate damage moment to electronic device in this case,
Manually can not power-off protection be carried out to electronic device within a very short time.
Utility model content
The purpose of this utility model is to provide a kind of self-locking protective circuits, can need to disconnect in circuit malfunctions total
During power supply, self-locking is kept after realizing deenergization, until failure solves, circuit after power-on and power-off, is restored to work shape again
State.
The purpose of this utility model can be achieved through the following technical solutions：
A kind of self-locking protective circuit, including power supply VCC, metal-oxide-semiconductor Q1 and three triode Q2, Q3, Q4, the power supply VCC
Connect the drain of metal-oxide-semiconductor Q1, the source level connection electrical appliance of the metal-oxide-semiconductor Q1；
Between the power supply VCC and the drain of metal-oxide-semiconductor Q1 there is node M1, the node M1 to pass through resistance R1 connections MOS
The grid of pipe Q1；
There is node M2, the current collection of the node M2 connecting triodes Q2 between the resistance R1 and the grid of metal-oxide-semiconductor Q1
Pole, the emitting stage ground connection of the triode Q2；
There is node M3, the collector of the node M3 connecting triodes Q3 is described between the resistance R1 and node M1
The emitter of triode Q3 is grounded by resistance R2；
There is node M4, the node M4 difference connecting triodes Q2 between the emitter of the triode Q3 and resistance R2
Ground level and triode Q4 ground level；
Between the power supply VCC and node M1 there is node M5, the node M5 to pass through resistance R3 connecting triodes Q4's
Emitter, the grounded collector of the triode Q4；
There is node M6, the node M6 connection diodes D1 is just between the emitter of the triode Q4 and resistance R3
Pole, the ground level of the cathode connecting triode Q3 of the diode D1；
There is node M7, the node M7 connections feedback control between the cathode of the diode D1 and the base stage of triode Q3
End processed.
Further, the feedback control end uses MCU microcontrollers, overvoltage crowbar, current foldback circuit or excess temperature
Protect circuit.
Further, the metal-oxide-semiconductor Q1 uses N-type metal-oxide-semiconductor.
Further, using NPN type triode, the triode Q4 uses three pole of positive-negative-positive by described triode Q2, Q3
Pipe.
The beneficial effects of the utility model：Self-locking protective circuit provided by the utility model, by controlling metal-oxide-semiconductor to electricity consumption
Device is powered, and the break-make of feedback control signal control metal-oxide-semiconductor is fed by feedback control end, is realized cut-out electrical appliance power supply, is passed through
The switching effect of three triodes forms loop control and realizes self-lock protection function, keeps electrical appliance off state, avoids circuit
Restart problem repeatedly when problem does not solve, while after circuit problem is solved again after power-on and power-off, the power supply of bio-occlusion electrical appliance,
The security of circuit is substantially increased, electrical appliance circuit board life and reliability has been effectively ensured, ensures the safety of electrical appliance, into
This is low, arranges in pairs or groups suitable for the protection circuit of various electronic products, greatly reduces the risk of electronic device damage, be effectively ensured
The quality of electronic product, safety and reliability.
Description of the drawings
The utility model is described in further detail in the following with reference to the drawings and specific embodiments.
Fig. 1 is the circuit diagram of the utility model.
Specific embodiment
The following is a combination of the drawings in the embodiments of the present utility model, and the technical scheme in the embodiment of the utility model is carried out
It clearly and completely describes, it is clear that the described embodiments are only a part of the embodiments of the utility model rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are without making creative work
The all other embodiment obtained, shall fall within the protection scope of the present invention.
As shown in Figure 1, the utility model provides a kind of self-locking protective circuit, including power supply VCC, connection power supply VCC and
The metal-oxide-semiconductor Q1 of electrical appliance and for loop from three triodes Q2, Q3, Q4 of lock control.
Wherein, metal-oxide-semiconductor Q1 uses N-type metal-oxide-semiconductor, has three grid, source level and drain contacts.Triode Q2, Q3, Q4 are equal
With three base stage, collector and emitting stage contacts, wherein, using NPN type triode, triode Q4 is adopted by triode Q2, Q3
Use PNP type triode.
The source level S connection electrical appliances of the drain D of power supply VCC connection metal-oxide-semiconductors Q1, metal-oxide-semiconductor Q1, the power supply as electrical appliance are defeated
Enter；There is node M1, the grid G that node M1 passes through resistance R1 connection metal-oxide-semiconductors Q1 between power supply VCC and the drain D of metal-oxide-semiconductor Q1.
There is node M2, the collector C2 of node M2 connecting triodes Q2, three between the grid G of resistance R1 and metal-oxide-semiconductor Q1
The emitting stage E2 ground connection of pole pipe Q2.
There is node M3, the collector C3 of node M3 connecting triodes Q3 between resistance R1 and node M1, triode Q3's
Emitter E 3 is grounded by resistance R2.
There is node M4, the ground level of node M4 difference connecting triodes Q2 between the emitter E 3 of triode Q3 and resistance R2
The ground level B4 of B2 and triode Q4.
There is node M5 between power supply VCC and node M1, node M5 by the emitter E 4 of resistance R3 connecting triodes Q4,
The collector C4 ground connection of triode Q4.
Between the emitter E 4 of triode Q4 and resistance R3 have node M6, the anode of node M6 connection diodes D1, two
The ground level B3 of the cathode connecting triode Q3 of pole pipe D1.
There is node M7, node M7 connection feedback controls end between the cathode of diode D1 and the base stage B3 of triode Q3.
Feedback control end is using MCU microcontrollers, overvoltage crowbar, current foldback circuit or thermal-shutdown circuit etc., when detecting use
There is overvoltage, overcurrent or excess temperature when failures in electric appliance, and output feedback ontrol signal (high level signal) arrives node M7.
Utility model works principle：
After system electrification, metal-oxide-semiconductor Q1 conductings, electrical appliance normal work；When feedback control end detects that electrical appliance occurred
Pressure, overcurrent or excess temperature are when failures, output high level signal to node M7, and triode Q3 is turned at this time, the level quilt of node M4
It draws high, and then triode Q2 is turned on, the level of node M2 is pulled low so that metal-oxide-semiconductor Q1 is disconnected, electrical appliance power-off；Meanwhile because of knot
The level of point M4 is driven high, and triode Q4 is caused to disconnect, so as to ensure that node M7 voltages are locked in high level state, i.e. MOS
Pipe Q1 is locked in off-state, recovers normally state after system cut-off is restarted.
Self-locking protective circuit provided by the utility model by the way that metal-oxide-semiconductor is controlled to power to electrical appliance, passes through feedback control end
The break-make of feedback control signal control metal-oxide-semiconductor is fed, cut-out electrical appliance power supply is realized, passes through the switching effect shape of three triodes
It is controlled into loop and realizes self-lock protection function, kept electrical appliance off state, circuit is avoided to restart repeatedly when problem does not solve
Problem, while after circuit problem is solved again after power-on and power-off, the power supply of bio-occlusion electrical appliance substantially increase the safety of circuit
Property, electrical appliance circuit board life and reliability has been effectively ensured, has ensured the safety of electrical appliance, it is at low cost, suitable for various electronics
The protection circuit collocation of product, greatly reduces the risk of electronic device damage, quality, the safety of electronic product has been effectively ensured
Property and reliability.
In the description of this specification, the description of reference term " one embodiment ", " example ", " specific example " etc. means
At least one of the utility model is contained in reference to the embodiment or example particular features, structures, materials, or characteristics described
In embodiment or example.In the present specification, schematic expression of the above terms be not necessarily referring to identical embodiment or
Example.Moreover, particular features, structures, materials, or characteristics described can be in any one or more embodiments or example
In combine in an appropriate manner.
More than content is only to the utility model structure example and explanation, the technology people of affiliated the art
Member does various modifications or additions to described specific embodiment or substitutes in a similar way, without departing from reality
With new structure or surmount scope defined in the claims, all should belong to the protection range of the utility model.
Claims (4)
1. a kind of self-locking protective circuit, it is characterised in that：Including power supply VCC, metal-oxide-semiconductor Q1 and three triodes Q2, Q3, Q4, institute
State the drain of power supply VCC connection metal-oxide-semiconductors Q1, the source level connection electrical appliance of the metal-oxide-semiconductor Q1；
Between the power supply VCC and the drain of metal-oxide-semiconductor Q1 there is node M1, the node M1 to pass through resistance R1 connection metal-oxide-semiconductors Q1
Grid；
There is node M2, the collector of the node M2 connecting triodes Q2, institute between the resistance R1 and the grid of metal-oxide-semiconductor Q1
State the emitting stage ground connection of triode Q2；
There is node M3, the collector of the node M3 connecting triodes Q3, three pole between the resistance R1 and node M1
The emitter of pipe Q3 is grounded by resistance R2；
There is node M4, the base of the node M4 difference connecting triodes Q2 between the emitter of the triode Q3 and resistance R2
The ground level of grade and triode Q4；
There is the transmitting that node M5, the node M5 pass through resistance R3 connecting triodes Q4 between the power supply VCC and node M1
Pole, the grounded collector of the triode Q4；
Between the emitter of the triode Q4 and resistance R3 have node M6, the anode of the node M6 connection diodes D1,
The ground level of the cathode connecting triode Q3 of the diode D1；
There is node M7, the node M7 connections feedback control between the cathode of the diode D1 and the base stage of triode Q3
End.
2. a kind of self-locking protective circuit according to claim 1, it is characterised in that：The feedback control end is mono- using MCU
Piece machine, overvoltage crowbar, current foldback circuit or thermal-shutdown circuit.
3. a kind of self-locking protective circuit according to claim 1, it is characterised in that：The metal-oxide-semiconductor Q1 uses N-type metal-oxide-semiconductor.
4. a kind of self-locking protective circuit according to claim 1, it is characterised in that：Described triode Q2, Q3 use NPN
Type triode, the triode Q4 use PNP type triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721441240.0U CN207410010U (en) | 2017-11-01 | 2017-11-01 | A kind of self-locking protective circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721441240.0U CN207410010U (en) | 2017-11-01 | 2017-11-01 | A kind of self-locking protective circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207410010U true CN207410010U (en) | 2018-05-25 |
Family
ID=62317916
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721441240.0U Active CN207410010U (en) | 2017-11-01 | 2017-11-01 | A kind of self-locking protective circuit |
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| Country | Link |
|---|---|
| CN (1) | CN207410010U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113872157A (en) * | 2021-10-09 | 2021-12-31 | 广州金升阳科技有限公司 | Hysteresis comparison control circuit |
-
2017
- 2017-11-01 CN CN201721441240.0U patent/CN207410010U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113872157A (en) * | 2021-10-09 | 2021-12-31 | 广州金升阳科技有限公司 | Hysteresis comparison control circuit |
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