CN106253221A - Weak current monolithic integrated optical circuit renewable type protection circuit and guard method - Google Patents
Weak current monolithic integrated optical circuit renewable type protection circuit and guard method Download PDFInfo
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- CN106253221A CN106253221A CN201610708894.9A CN201610708894A CN106253221A CN 106253221 A CN106253221 A CN 106253221A CN 201610708894 A CN201610708894 A CN 201610708894A CN 106253221 A CN106253221 A CN 106253221A
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- Prior art keywords
- resettable fuse
- integrated optical
- monolithic integrated
- fuse
- circuit
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
- H02H5/04—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature
- H02H5/041—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature additionally responsive to excess current
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Abstract
nullThe weak current monolithic integrated optical circuit renewable type protection circuit of present invention design，The emitter stage of its PNP triode is connected with electric fuse one end，The ground level of PNP triode connects one end of current-limiting resistance，The other end of current-limiting resistance connects the electric fuse other end，The colelctor electrode of PNP triode connects the base stage of NPN audion，The emitter stage of NPN audion is for connecting the earth terminal of D.C. regulated power supply，The colelctor electrode of PNP triode connects one end of load resistance，The other end of electric fuse is connected with the load resistance other end，It is connected filter capacitor between the colelctor electrode of NPN audion and emitter stage，The other end of electric fuse is for connecting the first power interface of microcontroller，The emitter stage of NPN audion is additionally operable to connect the second source interface of microcontroller，One end of electric fuse is for connecting the cathode power supply interface of D.C. regulated power supply.The present invention can play the insulation blocking effect to microprocessor, can repeatedly use.
Description
Technical field
The present invention relates to components and parts current protection technology field, can recover in particular to a kind of weak current monolithic integrated optical circuit
Formula protection circuit and guard method.
Technical background
Armament systems are that target is implemented effective damage, and fuse is the brain that weapon terminal injures system, is in weapon body
It it is the forward position of terminal antagonism.Existing fuse typically uses intelligentized design technology, commonly uses control powerful inside fuse
Monolithic integrated optical circuit.Owing to the operating characteristic of fuse is different from common electric machine electricity equipment or electronic equipment, it is desirable to single-chip integration
Circuit exports control signal the most by mistake.And actually due to monolithic integrated optical circuit easily by electrostatic, surge impact etc.
Impact, particularly accesses and entirely plays electrical system, and complicated electrical characteristic easily produces surge impact, causes monolithic integrated optical circuit to lose
Effect, if protecting not in time, may export control signal by mistake, producing potential safety hazard.
Existing conventional isolation element mainly has: fuse, disposable electric fuse.Fuse is to utilize metallic conductor conduct
Melt is series in circuit, when overload or short circuit current used melt, fuses because of himself heating, thus disconnecting circuit
A kind of device.Fuse as short circuit and the protector of overcurrent, because of himself simple in construction, easy to use, is extensively applied
In high and low voltage electric distribution system and control system and electrical equipment.Disposable electric fuse is similar with the principle of fuse, long use
Overcurrent protection in electrical system.Fuse and disposable electric fuse have an identical shortcoming: movement time length and not possessing
Restorability energy.Movement time is long, does not reaches the purpose of integrated circuit, does not possess restorability energy, is unsatisfactory for integrated circuit and exists
Can be by surge impact characteristic repeatedly during actually used.
Summary of the invention
Present invention aim to provide a kind of weak current monolithic integrated optical circuit renewable type protection circuit and protection side
Method, this circuit can play the insulation blocking effect to microprocessor, and circuit response time is fast, can repeatedly use.
An insulation blocking difficult problem for low current monolithic integrated optical circuit provides solution route.
For realizing this purpose, the weak current monolithic integrated optical circuit renewable type protection circuit designed by the present invention, its feature
Be: it include resettable fuse FU1, PNP triode V1, NPN audion V2, current-limiting resistor R1, filter capacitor C1 and
Load resistance R2, wherein, the emitter stage of described PNP triode V1 is connected with resettable fuse FU1 one end, PNP triode V1
Ground level connect one end of current-limiting resistance R1, the other end of current-limiting resistance R1 connects the resettable fuse FU1 other end, PNP tri-
The colelctor electrode of pole pipe V1 connects the base stage of NPN audion V2, and the emitter stage of NPN audion V2 is for connecting D.C. regulated power supply
The colelctor electrode of earth terminal GND, NPN audion V2 connects one end of load resistance R2, and the other end of resettable fuse FU1 is with negative
Carry the resistance R2 other end to connect, between colelctor electrode and the emitter stage of NPN audion V2, be connected filter capacitor C1, resettable fuse
The other end of FU1 is for connecting first power interface of microcontroller D1, and the emitter stage of NPN audion V2 is additionally operable to connect micro-control
The second source interface of device D1 processed, one end of resettable fuse FU1 is for connecting the cathode power supply interface of D.C. regulated power supply.
A kind of weak current monolithic integrated optical circuit renewable type guard method utilizing above-mentioned protection circuit, it is characterised in that
It comprises the steps:
Step 1: when surge current occurs in the microprocessor D1 lost efficacy, the dividing potential drop on resettable fuse FU1 increases；
Step 2: when reaching the turn-on condition of PNP triode V1, NPN audion V2 turns on the most therewith, and making to flow through can be extensive
The electric current of double insurance silk FU1 reaches the threshold value of starting protection, and resettable fuse FU1 starts overcurrent protection, resettable fuse
FU1 resistance becomes big；
Step 3: the microprocessor D1 both end voltage of inefficacy is limited in peace by the resettable fuse FU1 starting overcurrent protection
In full voltage, it is ensured that the microprocessor D1 of inefficacy will not miss output signal.
The renewable type protection circuit of the present invention is with resettable fuse as current sensitive element, under normal circumstances, and micro-control
The operating current of device processed be less than 5mA, when microcontroller short circuit or by electrical over-stress impact impaired after, internal circuit local burn
Ruining, it is impossible to normally work, its operating current is generally higher than 50mA, under 50mA low-current case, prior art cannot be carried out every
From protection, meanwhile, existing control circuit generally individually requires to quickly isolate protection, it is to avoid cause owing to microcontroller work is abnormal
Mistake output.The present invention uses resettable fuse as current sensitive element, in conjunction with positive current feedback circuit, collectively constitutes energy
Enough microcontrollers to weak current work carry out insulation blocking.When the operating current of microcontroller is more than 50mA, positive feedback current
Work, accesses circuit by loading resistor, causes the action current higher than resettable fuse of the electric current in circuit so that it is be in
Protected mode, serves the insulation blocking effect to microcontroller.Circuit structure of the present invention is simple, and low cost, reliability are high, electricity
Road response time is fast, and the insulation blocking difficult problem for low current monolithic integrated optical circuit provides solution route.
Resettable fuse of the present invention, is processed through special process by high-tech polymer resin and conductive nano crystal grain
Making, under normal circumstances, conductive nano crystal forms chain conductive path with the link of resin base, and electric fuse normally works；Work as electricity
When road is short-circuited or transships, the big electric current flowing through electric fuse makes it collect temperature rise, when reaching Curie temperature, and its density of states
Reducing rapidly, phase transformation increases, and internal electrically conductive links is that snowslide state becomes or fracture, and electric fuse is that phase step type adjourns high-impedance state, electricity
Stream is by rapid pinch off, thus carries out circuit quickly, limiting accurately and protecting.Owing to material behavior determines, guarantor can recovered
When danger silk is still not at full action, when energy raises with ambient temperature equilibrium heat dissipation balancing, protected effect is the best, namely
Say, use PTC type resettable fuse to need there are enough action currents by protection circuit, it is generally required to more than 200mA.
Accompanying drawing explanation
Fig. 1 is present invention circuit structure diagram when working；
Fig. 2 is to start the change in voltage performance diagram of microcontroller after overcurrent protection in the present invention；
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail:
A kind of weak current monolithic integrated optical circuit renewable type protection circuit, as described in Figure 1, it includes resettable fuse
FU1, PNP triode V1, NPN audion V2, current-limiting resistor R1, filter capacitor C1 and load resistance R2, wherein, described PNP
The emitter stage of audion V1 is connected with resettable fuse FU1 one end, and the ground level of PNP triode V1 connects the one of current-limiting resistance R1
End, the other end of current-limiting resistance R1 connects the resettable fuse FU1 other end, and the colelctor electrode of PNP triode V1 connects NPN tri-pole
The base stage of pipe V2, the emitter stage of NPN audion V2 is for connecting the collection of earth terminal GND, the NPN audion V2 of D.C. regulated power supply
Electrode connects one end of load resistance R2, and the other end of resettable fuse FU1 is connected with the load resistance R2 other end, NPN tri-
Being connected filter capacitor C1 between colelctor electrode and the emitter stage of pole pipe V2, the other end of resettable fuse FU1 is used for connecting micro-control
First power interface of device D1 processed, the emitter stage of NPN audion V2 is additionally operable to connect the second source interface of microcontroller D1, can
Recover one end of electric fuse FU1 for connecting the cathode power supply interface of D.C. regulated power supply.
In technique scheme, described resettable fuse FU1 is PTC type resettable fuse.Described recovery is insured
One end of silk FU1 is for connecting the 5V cathode power supply interface of D.C. regulated power supply.The earth terminal GND of described D.C. regulated power supply connects
Ground.
Described PTC type resettable fuse, is processed through special process by high-tech polymer resin and conductive nano crystal grain
Making, under normal circumstances, conductive nano crystal forms chain conductive path with the link of resin base, and electric fuse normally works；Work as electricity
When road is short-circuited or transships, the big electric current flowing through electric fuse makes it collect temperature rise, when reaching Curie temperature, and its density of states
Reducing rapidly, phase transformation increases, and internal electrically conductive links is that snowslide state becomes or fracture, and electric fuse is that phase step type adjourns high-impedance state, electricity
Stream is by rapid pinch off, thus carries out circuit quickly, limiting accurately and protecting, and its small electric current makes electric fuse be constantly in
Guard mode, when, after power-off and failture evacuation, phase transformation is restored, and nanocrystal is reduced into chain conductive path, resettable fuse
Revert to normal condition.During the internal partial burnt-out of single-chip microcomputer, the electric current flowing through resettable fuse FU1 is hundred person of outstanding talent's peace magnitudes, also
Not up to its action current, but now microcontroller power supply end still has the voltage of nearly 4V, needs further by Current amplifier, makes certainly
Recovering electric fuse and be in high-impedance state, the power supply of open failure microprocessor is powered.
In technique scheme, load resistance R2 is high reliability thick film type fixed resistor, and filter capacitor C1 is
Porcelain Jie's chip capacitor.
In technique scheme, PNP triode V1 controls the conducting of NPN audion V2, if after NPN pipe V2 conducting, and will
Load resistance R2 accesses circuit, and now circuital current becomes big, and after resettable fuse FU1 reaches thermal balance, circuit tends to steady
Fixed；The effect of filter capacitor C1 is to eliminate audion to power on and lead to characteristic wink and cause the fault of circuit erroneous action.
In technique scheme, current-limiting resistor R1, PNP triode V1, NPN audion V2, load resistance R2 and filtering
Electric capacity C1 forms positive current feedback circuit, when microprocessor work electric current becomes big, and the voltage at resettable fuse FU1 two ends becomes
Greatly, meet PNP triode V1 turn-on condition, drive NPN audion V2 conducting after the conducting of PNP triode V1 further, due to negative
The resistance carrying resistance R2 is little, and the electric current of circulation resettable fuse FU1 will become big, reach the effect of positive current feedback.
In technique scheme, use PTC type resettable fuse to carry out the insulation blocking of microprocessor, work as overcurrent
As a child, PTC type resettable fuse was recovered to chain conductive path by high-impedance state, it is possible to repeatedly use；
In technique scheme, positive current feedback circuit is used to carry out Current amplifier, it is ensured that can be to the monolithic of milliampere level
Integrated circuit carries out insulation blocking.
In technique scheme, using discrete device composition positive current feedback circuit, circuit is simple, reliable, it is to avoid due to
Using integrated circuit, circuit size is little, reliability is high；
In technique scheme, filter capacitor is used to be filtered, it is to avoid owing to the speed that powers on is high, to cause positive current feedback
Circuit error starting.
In the present embodiment, the model that model is SMD010, NPN audion V1 recovering electric fuse is BC817-25, PNP tri-
The model of pole pipe V2 is BC807-16, and the model of filter capacitor C1 is 0.1 μ F, and the resistance of current-limiting resistance R1 is 1k Ω, load electricity
The resistance of resistance R2 is 10 Ω.
A kind of weak current monolithic integrated optical circuit renewable type guard method utilizing above-mentioned protection circuit, it includes walking as follows
Rapid:
Step 1: when surge current occurs in the microprocessor D1 lost efficacy, the dividing potential drop on resettable fuse FU1 increases；
Step 2: when reaching the turn-on condition of PNP triode V1, NPN audion V2 turns on the most therewith, due to load electricity
The resistance little (10 Ω) of resistance R2, makes the electric current flowing through resettable fuse FU1 reach the threshold value of starting protection, resettable fuse
FU1 starts overcurrent protection, and resettable fuse FU1 resistance becomes big；
Step 3: the microprocessor D1 both end voltage of inefficacy is limited in peace by the resettable fuse FU1 starting overcurrent protection
In full voltage, it is ensured that the microprocessor D1 of inefficacy will not miss output signal.
In the step 1 of technique scheme, when there is surge current in the microprocessor D1 lost efficacy, resettable fuse
Dividing potential drop on FU1 increases to 1V.
In the step 2 of technique scheme, resettable fuse FU1 starts overcurrent protection, resettable fuse FU1 resistance
It become greater to 500K Ω.
In the step 3 of technique scheme, start the microprocessor D1 that the resettable fuse FU1 of overcurrent protection will lose efficacy
Both end voltage is limited in the safe voltage of 0～1V.
In the step 2 of technique scheme, the threshold value of described resettable fuse FU1 starting protection is 370mA.
Through surveying, the circuit in technique scheme, when there is short-circuit failure in microcontroller D1, resettable fuse
Can action in 50ms, increase the voltage at resettable fuse two ends, make the supply voltage of microcontroller D1 less than 1V, be less than
Rated supply voltage 3V required for its normal work, it is ensured that the microcontroller D1 of short-circuit failure can not miss output signal.
The content that this specification is not described in detail belongs to prior art known to professional and technical personnel in the field.
Claims (9)
1. a weak current monolithic integrated optical circuit renewable type protection circuit, it is characterised in that: it includes resettable fuse
FU1, PNP triode V1, NPN audion V2, current-limiting resistor R1, filter capacitor C1 and load resistance R2, wherein, described PNP
The emitter stage of audion V1 is connected with resettable fuse FU1 one end, and the ground level of PNP triode V1 connects the one of current-limiting resistance R1
End, the other end of current-limiting resistance R1 connects the resettable fuse FU1 other end, and the colelctor electrode of PNP triode V1 connects NPN tri-pole
The base stage of pipe V2, the emitter stage of NPN audion V2 is for connecting the collection of earth terminal GND, the NPN audion V2 of D.C. regulated power supply
Electrode connects one end of load resistance R2, and the other end of resettable fuse FU1 is connected with the load resistance R2 other end, NPN tri-
Being connected filter capacitor C1 between colelctor electrode and the emitter stage of pole pipe V2, the other end of resettable fuse FU1 is used for connecting micro-control
First power interface of device D1 processed, the emitter stage of NPN audion V2 is additionally operable to connect the second source interface of microcontroller D1, can
Recover one end of electric fuse FU1 for connecting the cathode power supply interface of D.C. regulated power supply.
Weak current monolithic integrated optical circuit renewable type protection circuit the most according to claim 1, it is characterised in that: described can
Recover one end of electric fuse FU1 for connecting the 5V cathode power supply interface of D.C. regulated power supply.
Weak current monolithic integrated optical circuit renewable type protection circuit the most according to claim 1, it is characterised in that: described directly
The earth terminal GND ground connection of stream regulated power supply.
Weak current monolithic integrated optical circuit renewable type guard method the most according to claim 1, it is characterised in that: described negative
The resistance carrying resistance R2 is 10 Ω, and the resistance of current-limiting resistance R1 is 1k Ω.
5. utilizing a weak current monolithic integrated optical circuit renewable type guard method for protection circuit described in claim 1, it is special
Levying and be, it comprises the steps:
Step 1: when surge current occurs in the microprocessor D1 lost efficacy, the dividing potential drop on resettable fuse FU1 increases；
Step 2: when reaching the turn-on condition of PNP triode V1, NPN audion V2 turns on the most therewith, makes to flow through and can recover to protect
The electric current of danger silk FU1 reaches the threshold value of starting protection, and resettable fuse FU1 starts overcurrent protection, and resettable fuse FU1 hinders
Value becomes big；
Step 3: the microprocessor D1 both end voltage of inefficacy is limited in safe electricity by the resettable fuse FU1 starting overcurrent protection
In pressure, it is ensured that the microprocessor D1 of inefficacy will not miss output signal.
Weak current monolithic integrated optical circuit renewable type guard method the most according to claim 5, it is characterised in that: described step
In rapid 1, when surge current occurs in the microprocessor D1 lost efficacy, the dividing potential drop on resettable fuse FU1 increases to 1V.
Weak current monolithic integrated optical circuit renewable type guard method the most according to claim 5, it is characterised in that: described step
In rapid 2, resettable fuse FU1 starts overcurrent protection, and resettable fuse FU1 resistance become greater to 500K Ω.
Weak current monolithic integrated optical circuit renewable type guard method the most according to claim 5, it is characterised in that: described step
In rapid 3, the microprocessor D1 both end voltage of inefficacy is limited in the peace of 0～1V by the resettable fuse FU1 starting overcurrent protection
In full voltage.
Weak current monolithic integrated optical circuit renewable type guard method the most according to claim 5, it is characterised in that: described can
The threshold value recovering electric fuse FU1 starting protection is 370mA.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610708894.9A CN106253221A (en) | 2016-08-23 | 2016-08-23 | Weak current monolithic integrated optical circuit renewable type protection circuit and guard method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610708894.9A CN106253221A (en) | 2016-08-23 | 2016-08-23 | Weak current monolithic integrated optical circuit renewable type protection circuit and guard method |
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| CN106253221A true CN106253221A (en) | 2016-12-21 |
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ID=57595856
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|---|---|---|---|
| CN201610708894.9A Pending CN106253221A (en) | 2016-08-23 | 2016-08-23 | Weak current monolithic integrated optical circuit renewable type protection circuit and guard method |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0736950A1 (en) * | 1995-04-04 | 1996-10-09 | BITRON S.p.A. | Device for protecting electronic circuits against supply battery disconnection (load dump) and/or overvoltages in the electrical supply circuit of motor vehicles |
| CN1565069A (en) * | 2001-10-03 | 2005-01-12 | 松下电器产业株式会社 | Electronic apparatus |
| CN101931151A (en) * | 2009-06-26 | 2010-12-29 | 上海市上海中学 | Multipurpose power board with intelligent fuse |
| CN102025140A (en) * | 2010-12-10 | 2011-04-20 | 深圳市万瑞和电子有限公司 | Polymeric positive temperature coefficient (PPTC) overcurrent protection module and electronic products |
| CN102064541A (en) * | 1999-10-22 | 2011-05-18 | 泰科电子有限公司 | Device and method for protection of chargeable element |
| CN102903468A (en) * | 2011-07-25 | 2013-01-30 | 瑞侃电子(上海)有限公司 | Overcurrent protection apparatus |
| CN103545803A (en) * | 2013-10-31 | 2014-01-29 | 广东威创视讯科技股份有限公司 | Protective device of equipment power source interface circuit |
-
2016
- 2016-08-23 CN CN201610708894.9A patent/CN106253221A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0736950A1 (en) * | 1995-04-04 | 1996-10-09 | BITRON S.p.A. | Device for protecting electronic circuits against supply battery disconnection (load dump) and/or overvoltages in the electrical supply circuit of motor vehicles |
| CN102064541A (en) * | 1999-10-22 | 2011-05-18 | 泰科电子有限公司 | Device and method for protection of chargeable element |
| CN1565069A (en) * | 2001-10-03 | 2005-01-12 | 松下电器产业株式会社 | Electronic apparatus |
| CN101931151A (en) * | 2009-06-26 | 2010-12-29 | 上海市上海中学 | Multipurpose power board with intelligent fuse |
| CN102025140A (en) * | 2010-12-10 | 2011-04-20 | 深圳市万瑞和电子有限公司 | Polymeric positive temperature coefficient (PPTC) overcurrent protection module and electronic products |
| CN102903468A (en) * | 2011-07-25 | 2013-01-30 | 瑞侃电子(上海)有限公司 | Overcurrent protection apparatus |
| CN103545803A (en) * | 2013-10-31 | 2014-01-29 | 广东威创视讯科技股份有限公司 | Protective device of equipment power source interface circuit |
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Application publication date: 20161221 |