CN208820480U - It a kind of cutting of overcurrent and powers on instantaneously without output charge protector - Google Patents
It a kind of cutting of overcurrent and powers on instantaneously without output charge protector Download PDFInfo
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- CN208820480U CN208820480U CN201820156374.6U CN201820156374U CN208820480U CN 208820480 U CN208820480 U CN 208820480U CN 201820156374 U CN201820156374 U CN 201820156374U CN 208820480 U CN208820480 U CN 208820480U
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- resistance
- triode
- capacitor
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Abstract
It the utility model discloses a kind of cutting of overcurrent and powers on instantaneously without output charge protector, specifically includes that overvoltage crowbar and current foldback circuit, the overvoltage crowbar are connected with the current foldback circuit.A kind of overcurrent of the utility model cuts off and powers on instantaneously the advantages of without exporting charge protector, effective protection electric appliance, highly-safe and reliable performance may be implemented.
Description
Technical field
The utility model relates to charge protector fields, and in particular, to a kind of cutting of overcurrent and power on instantaneously without defeated
Charge protector out.
Background technique
With the high speed development of Communication in China industry, important auxiliary products of the small charger as digital product,
As indispensable tool in common people's daily life, work.In recent years, being widely used with small charger, fills
There are many quality problems in electric appliance.Life security of the relationship between quality of charger to user.In news or network, often
It can be seen that charger inferior causes to explode and burn, huge loss is caused to the person and family's property, such as on July 8th, 2013,30
The man Wu Jiantong in year is being got shocked with charger inferior to apple iphone4 when the mobile phone is charging.On June 27th, 2015, mountain
One, western Taiyuan City, the village Dong Geduo, Jiancaoping District, 18 years old youth is shocked by electricity dead by phone charger.Afternoon on June 13rd, 2016, Zhang
One woman of state city Longwen District Lantian town Lantian society, meets with an accident when the mobile phone is charging, is electrically shocked dead.Therefore the quality problems of charger
It more needs to draw attention.
In addition, daily digital electrical apparatus, is all much to be powered using small charger, since charger in the market is irregular
It is uneven, it is easy to these electric appliances be damaged, caused harm to the human body.Then a protection circuit is designed, to these electric appliances
It is protected.
Utility model content
The purpose of this utility model is that instantaneously being filled without output in view of the above-mentioned problems, proposing that a kind of overcurrent is cut off and powered on
Electric protection circuit, the advantages of to realize effective protection electric appliance, highly-safe and reliable performance.
It a kind of overcurrent that in order to achieve the above purposes, the technical solution adopted by the utility model is: cutting and powers on instantaneously without defeated
Charge protector out specifically includes that overvoltage crowbar and current foldback circuit, the overvoltage crowbar and the overcurrent
Protection circuit is connected.
Further, the overvoltage crowbar includes: input terminal V_IN, the input terminal V_IN respectively with the resistance
One end of R2, one end of resistance R6, one end of resistance R7, one end of capacitor C3 and PMOS tube Q6 the end S be connected, the electricity
The other end of resistance R2 is separately connected one end of resistance R3 and the base stage of triode Q1, the other end of the resistance R3 and three poles
The emitter of pipe Q1 is grounded, the collector of the triode Q1 be separately connected the other end of resistance R6, resistance R12 one end,
The base stage of triode Q2, the base stage of the triode Q2 are also connected with one end of capacitor C5, the other end and electricity of the resistance R12
The other end for holding C5 is grounded, the emitter ground connection of the triode Q2, the collector connection resistance R8's of the triode Q2
The other end of one end, the resistance R8 is separately connected the G of the other end of resistance R7, the other end of capacitor C3 and PMOS tube Q6
The D at end, the PMOS tube Q6 terminates output end DC_5V.
Further, the current foldback circuit includes: input terminal DC_5V, and the input terminal DC_5V is separately connected capacitor
One end of one end of C2, the end S of PMOS tube Q13 and resistance R14, the other end ground connection of the capacitor C2, the resistance R14's
The other end is separately connected the end G of one end of resistance R18, one end of capacitor C7, one end of resistance R15 and PMOS tube Q13, described
The other end of resistance R18 and the other end of capacitor C7 are grounded, the current collection of another connection one end triode Q14 of the resistance R15
Pole, the emitter ground connection of the triode Q14, the base stage of the triode Q14 are separately connected one end of resistance R22, resistance R16
One end and triode Q15 collector, the other end of the resistance R22 and the emitter of triode Q15 are grounded, described
The base stage of triode Q15 is separately connected one end of resistance R20 and one end of resistance R17, the other end connection of the resistance R20
The emitter of triode Q15, the collector of the other end connecting triode Q7 of the resistance R17, the transmitting of the triode Q7
Pole is separately connected the one end at the end D of PMOS tube Q13, the other end of resistance R16 and resistance R13, the base stage of the triode Q7
It is separately connected the other end and output end V_OUT of resistance R13.
Further, the input terminal DC_5V of the output end DC_5V of the overvoltage crowbar and the current foldback circuit
It is connected.
The advantageous effects of the utility model:
1, overvoltage protection is inputted；
2, powered on moment delay output (when the moment or voltage for ensuring to power on unexpected great-jump-forward change, delay output)；
3, it may be programmed overcurrent protection；
4, after overcurrent protection, cutting output；It is irrecoverable, need to re-power activation.
Other features and advantages of the utility model will illustrate in the following description, also, partly from specification
In become apparent, or understood and implementing the utility model.
Below by drawings and examples, the technical solution of the utility model is described in further detail.
Detailed description of the invention
Attached drawing is used to provide a further understanding of the present invention, and constitutes part of specification, practical with this
Novel embodiment is used to explain the utility model together, does not constitute limitations of the present invention.In the accompanying drawings:
Fig. 1 is a kind of overcurrent cutting described in the utility model and powers on the overvoltage protection instantaneously without output charge protector
Circuit；
Fig. 2 is a kind of overcurrent cutting described in the utility model and powers on the overcurrent protection instantaneously without output charge protector
Circuit.
Specific embodiment
It is illustrated below in conjunction with preferred embodiment of the attached drawing to the utility model, it should be understood that described herein excellent
It selects embodiment to be only used for describing and explaining the present invention, is not used to limit the utility model.
It a kind of cutting of overcurrent and powers on instantaneously without output charge protector, specifically includes that overvoltage crowbar and overcurrent
Circuit is protected, the overvoltage crowbar is connected with the current foldback circuit.
As shown in Figure 1, the overvoltage crowbar includes: input terminal V_IN, the input terminal V_IN respectively with the electricity
The end S for hindering one end of R2, one end of resistance R6, one end of resistance R7, one end of capacitor C3 and PMOS tube Q6 is connected, described
The other end of resistance R2 is separately connected one end of resistance R3 and the base stage of triode Q1, the other end and three of the resistance R3
The emitter of pole pipe Q1 is grounded, the collector of the triode Q1 be separately connected the other end of resistance R6, resistance R12 one
End, triode Q2 base stage, the base stage of the triode Q2 is also connected with one end of capacitor C5, the other end of the resistance R12 with
And the other end of capacitor C5 is grounded, the emitter ground connection of the triode Q2, the collector of the triode Q2 connects resistance
One end of R8, the other end of the resistance R8 are separately connected the other end of resistance R7, the other end of capacitor C3 and PMOS tube Q6
The end G, the D of the PMOS tube Q6 terminates output end DC_5V.
One, the element in overvoltage crowbar is described below,
Resistance R2 and R3 form bleeder circuit, detect to input voltage, while controlling conducting and the pipe of triode Q1
It is disconnected.
The collector of NPN triode Q1 is connected to the base stage of Q2, and Q1 controls the conducting and cut-off of Q2.
The collector of NPN triode Q2 is connected to the grid of PMOS tube Q3, and Q2 controls the conducting and cut-off of Q3.
Resistance R6 and R12 are the biasing circuits of Q2 base stage.
Resistance R7 and R8 are the gate bias circuits of PMOS tube Q6.
C5 is reserved capacitor, is used to upgrade circuit later.
C3, which is powered on moment, becomes equipotential the Vgs of Q6, guarantees that powered on moment Q6 is off state.
Two, Introduction on Principle
1, overvoltage protection
Q1 is NPN triode, and model is 2N3904.It is calculated by conducting voltage 0.7V, when V_IN is more than 6.5V, NPN tri-
Pole pipe Q1 conducting, the current collection of Q1 extremely low level, so that model is the NPN triode Q2 cut-off of 2N3904, the current collection of Q2 is extremely
High level, so that Q6 is closed without output, turns off voltage so that the GS level of PMOS tube Q6 (model GN2301) is equal
DC_5V output.
2, powered on moment delay output
Capacitor C3 can guarantee in the moment powered on, and regardless of whether the voltage of V_IN is normal, all cuttings export and postpone 500
Millisecond just exports.Ensure the moment that is powered, without voltage output.Because the moment that is powered does not know that voltage is high or low, Er Qie electricity
It flows bigger, is easy to burn out thing.
As shown in Fig. 2, the current foldback circuit includes: input terminal DC_5V, the input terminal DC_5V is separately connected electricity
Hold one end, the end S of PMOS tube Q13 and one end of resistance R14 of C2, the other end ground connection of the capacitor C2, the resistance R14
The other end be separately connected the end G of one end of resistance R18, one end of capacitor C7, one end of resistance R15 and PMOS tube Q13, institute
The other end of the other end and capacitor C7 of stating resistance R18 is grounded, the collection of another connection one end triode Q14 of the resistance R15
Electrode, the emitter ground connection of the triode Q14, the base stage of the triode Q14 are separately connected one end of resistance R22, resistance
One end of R16 and the collector of triode Q15, the other end of the resistance R22 and the emitter of triode Q15 are grounded,
The base stage of the triode Q15 is separately connected one end of resistance R20 and one end of resistance R17, the other end of the resistance R20
The emitter of connecting triode Q15, the collector of the other end connecting triode Q7 of the resistance R17, the triode Q7's
Emitter is separately connected the one end at the end D of PMOS tube Q13, the other end of resistance R16 and resistance R13, the triode Q7's
Base stage is separately connected the other end and output end V_OUT of resistance R13.
One, component involved in current foldback circuit is more complicated, and element is described below,
C2 is reserved capacitor, upgrades circuit after convenient and uses.
Q13 is P-channel metal-oxide-semiconductor, and resistance R14 and R15 are the biasing resistors of Q13 source electrode and grid.
R18 is the discharge resistance of capacitor C7.
The effect of C7 is the moment powered in DC_5V, and Q13 is opened.
Q14 is NPN triode, for controlling the turn-on and turn-off of Q13.
R16 and R22 is connected to the base stage of Q14, forms bleeder circuit, provides bias voltage to Q14.
Triode Q15 plays the turn-on and turn-off of control Q14
R17 and R20 is connected to the base stage of Q15, forms bleeder circuit, provides bias voltage to Q15.
R13 is over-current detection resistance, and resistance value is adjustable.
Q7 is PNP triode, and effect is the voltage for detecting the both ends R13.Different load currents, the voltage ginseng at the both ends R13
Number is different.
Two, Introduction on Principle
1, overcurrent protection
The voltage DC_5V come out from overvoltage crowbar, is connected to Q13 (PMOS tube, model GN2301), due to capacitor C7
Presence, Q13 can be connected rapidly.And triode Q14 (model 3904) can be connected, so that Q13 is locked on state.
Resistance R13 and PNP type triode Q7 forms current foldback circuit.The size of overcurrent value is 0.7/R13.The resistance value of R13 can be adjusted
Section, for this angle, overcurrent is adjustable can to program setting.
2, self-lock protection
The overcurrent of this circuit design is 300ma, when load current is greater than 300ma, PNP triode Q7 (model 3906)
Collector output voltage to NPN triode Q1 5, Q15 conducting drags down the base voltage of Q14, then the collector of Q14 is high electricity
It is flat, to cut off output.It is irrecoverable after tripping protection starting, to restore to export, it is necessary to re-power primary.
The output end DC_5V of the overvoltage crowbar is connected with the input terminal DC_5V of the current foldback circuit.
At least can achieve it is following the utility model has the advantages that
1, overvoltage protection is inputted；
2, powered on moment delay output (when the moment or voltage for ensuring to power on unexpected great-jump-forward change, delay output)；
3, it may be programmed overcurrent protection；
4, after overcurrent protection, cutting output；It is irrecoverable, need to re-power activation.
Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention, it is not limited to this
Utility model, although the utility model is described in detail with reference to the foregoing embodiments, for those skilled in the art
For, it is still possible to modify the technical solutions described in the foregoing embodiments, or to part of technical characteristic
It is equivalently replaced.Within the spirit and principle of the utility model, any modification, equivalent replacement, improvement and so on,
It should be included within the scope of protection of this utility model.
Claims (3)
1. a kind of overcurrent is cut off and powers on instantaneously without output charge protector, which is characterized in that specifically include that overvoltage protection electricity
Road and current foldback circuit, the overvoltage crowbar are connected with the current foldback circuit；
The overvoltage crowbar includes: input terminal V_IN, the input terminal V_IN respectively with one end of resistance R2, resistance R6
One end, one end of resistance R7, one end of capacitor C3 and PMOS tube Q6 the end S be connected, the other end difference of the resistance R2
One end of resistance R3 and the base stage of triode Q1 are connected, the other end of the resistance R3 and the emitter of triode Q1 connect
Ground, the collector of the triode Q1 are separately connected the base stage of the other end of resistance R6, one end of resistance R12, triode Q2, institute
The base stage for stating triode Q2 is also connected with one end of capacitor C5, and the other end of the resistance R12 and the other end of capacitor C5 connect
Ground, the emitter ground connection of the triode Q2, one end of the collector connection resistance R8 of the triode Q2, the resistance R8's
The other end is separately connected the end G of the other end of resistance R7, the other end of capacitor C3 and PMOS tube Q6, the D of the PMOS tube Q6
Terminate output end DC_5V.
2. a kind of overcurrent according to claim 1 is cut off and powers on instantaneously without output charge protector, which is characterized in that
The current foldback circuit includes: input terminal DC_5V, and the input terminal DC_5V is separately connected one end of capacitor C2, PMOS tube
The end S of Q13 and one end of resistance R14, the other end ground connection of the capacitor C2, the other end of the resistance R14 are separately connected
One end of resistance R18, one end of capacitor C7, one end of resistance R15 and PMOS tube Q13 the end G, the resistance R18's is another
The other end of end and capacitor C7 are grounded, the collector of the other end connecting triode Q14 of the resistance R15, the triode
The emitter of Q14 is grounded, and the base stage of the triode Q14 is separately connected one end of resistance R22, one end of resistance R16 and three
The collector of pole pipe Q15, the other end of the resistance R22 and the emitter of triode Q15 are grounded, the triode Q15's
Base stage is separately connected one end of resistance R20 and one end of resistance R17, the other end connecting triode Q15's of the resistance R20
Emitter, the collector of the other end connecting triode Q7 of the resistance R17, the emitter of the triode Q7 are separately connected
The end D of PMOS tube Q13, the other end of resistance R16 and resistance R13 one end, the base stage of the triode Q7 is separately connected electricity
Hinder the other end and output end V_OUT of R13.
3. a kind of overcurrent according to claim 1 or 2 is cut off and power on instantaneously without output charge protector, feature exists
In the output end DC_5V of the overvoltage crowbar is connected with the input terminal DC_5V of the current foldback circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820156374.6U CN208820480U (en) | 2018-01-30 | 2018-01-30 | It a kind of cutting of overcurrent and powers on instantaneously without output charge protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820156374.6U CN208820480U (en) | 2018-01-30 | 2018-01-30 | It a kind of cutting of overcurrent and powers on instantaneously without output charge protector |
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| Publication Number | Publication Date |
|---|---|
| CN208820480U true CN208820480U (en) | 2019-05-03 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820156374.6U Expired - Fee Related CN208820480U (en) | 2018-01-30 | 2018-01-30 | It a kind of cutting of overcurrent and powers on instantaneously without output charge protector |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110277775A (en) * | 2019-07-29 | 2019-09-24 | 山东国研自动化有限公司 | A kind of intrinsic safety current-limiting circuit constituted based on discrete component |
-
2018
- 2018-01-30 CN CN201820156374.6U patent/CN208820480U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110277775A (en) * | 2019-07-29 | 2019-09-24 | 山东国研自动化有限公司 | A kind of intrinsic safety current-limiting circuit constituted based on discrete component |
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|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190503 Termination date: 20210130 |
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| CF01 | Termination of patent right due to non-payment of annual fee |