CN102629751A - Over-current protection circuit - Google Patents
Over-current protection circuit Download PDFInfo
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- CN102629751A CN102629751A CN2012101256393A CN201210125639A CN102629751A CN 102629751 A CN102629751 A CN 102629751A CN 2012101256393 A CN2012101256393 A CN 2012101256393A CN 201210125639 A CN201210125639 A CN 201210125639A CN 102629751 A CN102629751 A CN 102629751A
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Abstract
The invention discloses an over-current protection circuit, including a switch control module, high and low level states, and software and hardware switch protection modules. An input end and an output end of the switch control module are respectively connected with a high level and a load, the software and hardware switch protection modules are connected with a control end of the switch control module, and the software switch protection module includes a constant current source module. In the over-current protection circuit provided by the invention, output turning-off of the switch control module can be controlled automatically either by the software switch protection module according to the practical running need of a device or by hardware through automatically detecting electric current flowing through a power driving tube. The two protection methods are integrated together, and protection will take effect if either condition is met at any time. The constant current source module will keep an output turning-off state if the load is short-circuited for a long time, and can return back to its normal state once external abnormalities are excluded. Therefore the device can be free of maintenance and manual intervention in operation, which reduces labor cost and greatly improves labor productivity.
Description
Technical field
The present invention relates to the current protection technology field of electronic equipment, particularly a kind of current foldback circuit.
Background technology
Current foldback circuit is one of protective circuit the most frequently used in the design of electronic circuits; Mainly be in order to automatically shut down electric current output when change is big suddenly in load short circuits or electric current; Avoid burning out the power drive pipe, cause high maintenance cost, but also influence ordinary production.
Over-current protection method commonly used comprises: one, directly use standard over-current protection device (like fuse), behind overcurrent, can will burn fuse, just only need to change fuse when keeping in repair so and get final product, and need not change expensive power drive pipe; Two, use resettable fuse, short circuit has good protection effect to this method to momentary load, in case but the load short circuits time long partially, the self-recovering function of fuse is the starting power driving tube once more, finally still can cause the power drive pipe to damage; Three, according to the special current foldback circuit of the principle design of resettable fuse; Can be applied in the specific environment for use; But they have a common shortcoming to protect slow motion exactly; Can't remain on guard mode, also just can't thoroughly avoid the damage of equipment, and the maintenance cost after just reducing device damage within the specific limits as far as possible or reduce device damage through certain means.
Summary of the invention
Weak point in view of above-mentioned prior art; The object of the present invention is to provide a kind of current foldback circuit; No matter equipment is that external loading is unusual in running, or short circuit takes place, and current foldback circuit switching off load rapidly also keeps being in off state; Even how long short circuit can not cause device damage, and under the situation about need not cut off the power supply as long as outside abnormal conditions can be recovered normal operating conditions after getting rid of at once.
In order to achieve the above object, the present invention has taked following technical scheme:
A kind of current foldback circuit, it comprises:
Be used to control the switch control module of the operating state of current foldback circuit;
Be used for high-low level state, the software switch protection module that corresponding control switch control module opens and closes according to control signal;
Be used for when loaded work piece perhaps cuts off the power supply unusually, controlling switch control module and close the hardware switch protection module that the control switch control module is opened when load is normal;
The input of said switch control module connects high level, and output connects load; Said software switch protection module is connected the control end of switch control module with the hardware switch protection module;
Said software switch protection module comprises and being used for when switch control module is closed; Be hardware switch protection module, software switch protection module, switch control module power supply, make the constant-current source module of the state maintenance of hardware switch protection module, software switch protection module, switch control module.
In the described current foldback circuit, said switch control module comprises switching tube, the base stage connection hardware switch protection module of said switching tube, and collector electrode connects load, and emitter connects high level.
In the described current foldback circuit, also comprise the discharge module that is used for discharge when load is cut off the power supply, said discharge module connects high level and switch control module.
In the described current foldback circuit; Said discharge module comprises discharge diode and discharge resistance, and the positive pole of said discharge diode connects the collector electrode of switching tube, and negative pole connects the emitter of switching tube and an end of discharge resistance; One end of said discharge resistance also connects high level, other end ground connection.
In the described current foldback circuit, comprise also being used to the filtration module that load provides stable voltage that said filtration module is connected between the output and load of switch control module.
In the described current foldback circuit, said filtration module comprises filter capacitor, and an end of said filter capacitor connects load and switch control module, other end ground connection.
In the described current foldback circuit, said hardware switch protection module comprises first triode, second triode, the 4th triode, the 5th triode, the 7th triode, first electric capacity, first diode, the 3rd diode, second resistance, the 3rd resistance, the 4th resistance, the 7th resistance, the tenth resistance, the 11 resistance and the 12 resistance;
The base stage of said first triode connects the emitter of the 7th triode, also connects the collector electrode of the 5th triode via second resistance; The collector electrode of first triode connects an end of output and the 3rd resistance of switch control module, also is connected the base stage of the 4th triode via the 4th resistance, and said first transistor emitter connects the control end of switch control module, also connects high level, the collector electrode of the 7th triode, an end and the software switch protection module of first electric capacity via the 12 resistance; The other end of said first electric capacity connects the base stage of the 7th triode; The base stage of said the 7th triode connects the other end of software switch protection module and the 3rd resistance;
The collector electrode of said second triode connects the positive pole of first diode, also via the 11 grounding through resistance, the negative pole of said first diode connects high level; The emitter of said second triode connects the collector electrode of the 4th triode via the 7th resistance, and the base stage of second triode connects the collector electrode of the 5th triode; The emitter of said the 4th triode connects the positive pole of the 3rd diode, and the negative pole of the 3rd diode connects the software switch protection module; The base stage of said the 5th triode connects high level, and emitter is through the tenth grounding through resistance.
In the described current foldback circuit, said software switch protection module comprises the 3rd triode, the 6th triode, second diode, the 5th resistance, the 6th resistance, the 8th resistance and the 9th resistance;
The positive pole that the base stage of said the 3rd triode connects second diode is with the negative pole of the 3rd diode, also be connected the emitter of the 3rd triode, an end of first electric capacity and the collector electrode of the 7th triode via the 5th resistance, and the collector electrode of said the 3rd triode connects the other end of first electric capacity, the other end of the 3rd resistance and the base stage of the 7th triode;
One end of said the 8th resistance connects an end of the 5th resistance, and the other end connects the negative pole of second diode, also connects the collector electrode of the 6th triode via the 9th resistance; The base stage of the 6th triode connects high level, and emitter is via the 6th resistance connection control signal output.
In the described current foldback circuit, said first triode, second triode, the 3rd triode, the 4th triode, switching tube are the PNP triode, the 5th triode, the 6th triode and the seven or three utmost point and be the NPN triode.
In the described current foldback circuit, said constant-current source module comprises the 3rd triode and the 5th resistance.
Compared to prior art, current foldback circuit provided by the invention comprises switch control module, software switch protection module and hardware switch protection module; Can be by the needs of software switch protection module according to the equipment actual motion; As the power saving when controlling electric sequence or equipment and suspending, come the control switch control module to close output, also can detect size of current automatically by hardware through the power drive pipe; The automatic control switch control module is closed output; Can realize defencive function with the fastest speed like this, two kinds of protected modes merge, and protection came into force when whenever any condition satisfied; And; When the long-time short circuit of load; By the state that the constant-current source module keeps shut and exports, therefore how long short circuit can not cause device damage, after needing only outside abnormal conditions eliminating under the situation about need not cut off the power supply, can recover normal operating conditions at once; Accomplished really to make that equipment is non-maintaining in operation process, the manpower-free intervenes, not only reduced artificial cost but also greatly raised labour productivity.
Description of drawings
Fig. 1 is the circuit theory diagrams of current foldback circuit of the present invention.
Fig. 2 is during for current foldback circuit operate as normal of the present invention, the conducting state figure of each triode of current foldback circuit.
When Fig. 3 starts for software switch protection module in the current foldback circuit of the present invention, the conducting state figure of each triode of current foldback circuit.
When Fig. 4 starts for hardware switch protection module in the current foldback circuit of the present invention, the conducting state figure of each triode of current foldback circuit.
Embodiment
The present invention provides a kind of current foldback circuit, and is clearer, clear and definite for making the object of the invention, technical scheme and effect, below develops simultaneously embodiment to further explain of the present invention with reference to accompanying drawing.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
See also Fig. 1, current foldback circuit provided by the invention comprises switch control module 101, software switch protection module 102 and hardware switch protection module 103.The input of said switch control module 101 connects the DV133.0 high level, and output connects load; Said software switch protection module 102 is connected the control end of switch control module 101 with hardware switch protection module 103.Comprise the constant-current source module at said software switch protection module 102.
Wherein, Switch control module 101 is used to control the operating state of current foldback circuit; Software switch protection module 102 is used for the high-low level state according to control signal; Corresponding control switch control module 101 opens and closes, and hardware switch protection module 103 is used for when loaded work piece perhaps cuts off the power supply unusually, controlling switch control module 101 closes, and control switch control module 101 is opened when load is normal.Merge through software switch protection module 102 and hardware switch protection module 103 dual modes, the output of automatic off switch control module 101 when whenever any condition satisfies comes into force protection.Said constant-current source module is used for when switch control module 101 is closed; Be hardware switch protection module 103, software switch protection module 102, switch control module 101 power supplies; The state of hardware switch protection module 103, software switch protection module 102, switch control module 101 is kept; When the load short circuits situation did not exist, the electric current of constant-current source module disappeared immediately, and switch control module 101 is opened automatically; But realized the auto restore facility that keeps of protective circuit, both counteract each other, complement each other.
In the embodiment of the invention; Said switch control module 101 comprises switching tube Q8; The base stage of said switching tube Q8 (being the control end of switch control module 101) connection hardware switch protection module 103; Collector electrode (being the output of switch control module 101) connects load, and emitter (being the input of switch control module 101) connects the DV133.0 high level.
Current foldback circuit provided by the invention comprises also and is used to the filtration module 105 that load provides stable voltage that said filtration module 105 is connected between the output and load of switch control module 101.This filtration module 105 filter capacitor CU1, the end of said filter capacitor CU1 connects load and switch control module 101, other end ground connection.This filter capacitor CU1 is mainly when device power voltage is slowly risen, and prevents the generation of surge voltage, causes the late-class circuit system to be destroyed because of instantaneous pressure, and guarantees that the voltage in the entire work process is stable.
Because the characteristic of the storage electric weight of filter capacitor CU1 will still have remaining capacity after the device powers down, and possibly keep a period of time, remaining capacity makes late-class circuit be in a kind of not controlled state.In order to prevent load when outage; Equipment is charged when avoiding manual operation; Current foldback circuit provided by the invention also comprises the discharge module 104 that is used for discharge when load is cut off the power supply; Said discharge module 104 connects high level and switch control modules 101, can moment that load is cut off the power supply rapidly with DV133.0 and load in residual electric weight bleed off and be reduced to 0V, guaranteed operating personnel's life safety.
Said discharge module 104 comprises discharge diode D4 and discharge resistance R13; The positive pole of said discharge diode D4 connects the collector electrode of switching tube Q8; Negative pole connects the emitter of switching tube Q8 and the end of discharge resistance R13, and the end of said discharge resistance R13 also connects high level, other end ground connection.
Please continue to consult Fig. 1; In current foldback circuit provided by the invention, said hardware switch protection module 103 comprises the first triode Q1, the second triode Q2, the 4th triode Q4, the 5th triode Q5, the 7th triode Q7, first capacitor C 1, the first diode D1, the 3rd diode D3, second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the 7th resistance R 7, the tenth resistance R the 10, the 11 resistance R 11 and the 12 resistance R 12.
The base stage of the said first triode Q1 connects the emitter of the 7th triode Q7, also connects the collector electrode of the 5th triode Q5 via second resistance R 2; The output that the collector electrode of the first triode Q1 connects switch control module 101 is with an end of the 3rd resistance R 3, also is connected the base stage of the 4th triode Q4 via the 4th resistance R 4, the said first triode Q1 emitter connects the control end of switch control module 101, also via the 12 resistance R 12 connection DV133.0 high level, the collector electrode of the 7th triode Q7, an end and the software switch protection module 102 of first capacitor C 1; The other end of said first capacitor C 1 connects the base stage of the 7th triode Q7; The base stage of said the 7th triode Q7 connects the other end of software switch protection module 102 and the 3rd resistance R 3.
The collector electrode of the said second triode Q2 connects the positive pole of the first diode D1, also via the 11 resistance R 11 ground connection, the negative pole of the said first diode D1 connects the AV15.0 high level; The emitter of the said second triode Q2 is via the collector electrode of the 7th resistance R 7 connections the 4th triode Q4, and the base stage of the second triode Q2 connects the collector electrode of the 5th triode Q5; The emitter of said the 4th triode Q4 connects the positive pole of the 3rd diode D3, and the negative pole of the 3rd diode D3 connects software switch protection module 102; The base stage of said the 5th triode Q5 connects the AV15.0 high level, and emitter is through the tenth resistance R 10 ground connection.
In current foldback circuit provided by the invention, said software switch protection module 102 comprises the 3rd triode Q3, the 6th triode Q6, the second diode D2, the 5th resistance R 5, the 6th resistance R 6, the 8th resistance R 8 and the 9th resistance R 9.First capacitor C 1 in this software switch protection module 102 and the hardware switch protection module 103, the 3rd resistance R the 3, the 12 resistance R 12, the first triode Q1, the 7th triode Q7 and the 3rd diode D3 acting in conjunction, its working method will be described in detail in the wings.Said constant-current source module comprises the 3rd triode Q3 and the 5th resistance R 5; This constant-current source module is after overcurrent protection; Keep to the first triode Q1, the 3rd triode Q3, the 7th triode Q7 and switching tube Q8 power supply, protect the conducting state of these triodes, cancel up to short-circuit conditions.
The positive pole that the base stage of said the 3rd triode Q3 connects the second diode D2 is with the negative pole of the 3rd diode D3, also be connected the emitter of the 3rd triode Q3, an end of first capacitor C 1 and the collector electrode of the 7th triode Q7 via the 5th resistance R 5, and the collector electrode of said the 3rd triode Q3 connects the other end of first capacitor C 1, the other end of the 3rd resistance R 3 and the base stage of the 7th triode Q7.
One end of said the 8th resistance R 8 connects an end of the 5th resistance R 5, and the other end connects the negative pole of the second diode D2, also connects the collector electrode of the 6th triode Q6 via the 9th resistance R 9; The base stage of the 6th triode Q6 connects the AV15.0 high level, and emitter is via the 6th resistance R 6 connection control signal outputs.
Wherein, The present invention also needs relevant regulations to the type of each triode; The said first triode Q1, the second triode Q2, the 3rd triode Q3, the 4th triode Q4, switching tube are the PNP triode, the 5th triode Q5, the 6th triode Q6 and the seven or three utmost point and be the NPN triode.
Please consult Fig. 1 once more; In current foldback circuit provided by the invention; Between the negative pole of the emitter of switching tube Q8 and discharge diode D4, be in series with first resistance R 1, this first resistance R 1 is a sampling resistor, is used for detecting the size of the electric current of primary path; When electrorheological was big, the voltage at first resistance R, 1 two ends became big thereupon.
Below in conjunction with Fig. 1, Fig. 2, Fig. 3 and Fig. 4 the operation principle of current foldback circuit provided by the invention is elaborated:
One, normal operating conditions:
Current ratio through first resistance R 1 hour; The voltage at the 12 resistance R 12 two ends is also smaller, and because the voltage of DV133.0 high level is constant, so the voltage of the first triode Q1 emitter is also just bigger; Impel the first triode Q1 conducting; After the first triode Q1 conducting, electric current forms current circuit to ground, thereby makes switching tube Q8 base stage produce electric current through the 12 resistance R 12, the first triode Q1, second resistance R 2, the 5th triode Q5, the tenth resistance R 10; Make the switching tube conducting; This moment, switching tube Q8 was in normal open mode, made in the current foldback circuit conducting state of each triode as shown in Figure 2, and software switch protection module 102 and hardware switch protection module 103 all are failure to actuate.
Two, the defencive function of software switch protection module 102:
When software switch protection module 102 started, the conducting state of each triode was as shown in Figure 3 in the current foldback circuit.(this control signal off is by software program control output, and when software work unusually not during deal with data, this moment, control signal off was a high level when control signal output ends output control signal off; Be open-circuit condition), and when the off signal was high level (being DV15.0) or open circuit, the 6th triode Q6 base stage did not have electric current to produce; So be in cut-off state, therefore there is not electric current to produce on the 9th resistance R 9 yet, its voltage equates; Likewise, the voltage at the 8th resistance R 8, the second diode D2, the 5th resistance R 5 two ends is also identical, and the voltage at the 3rd triode Q3 base stage and emitter two ends equates so; Do not have electric current to produce, so the 3rd triode Q3 is in cut-off state, so the 7th triode Q7 base voltage is 0V; So the 7th triode Q7 also ends, corresponding first triode Q1 and switching tube all are in conducting, are 0V in case the off signal drags down; The 6th triode Q6 conducting has electric current to produce, and electric current forms current circuit through the 5th resistance R 5, the second diode D2, the 9th resistance R 9, the 6th triode Q6, the 6th resistance R 6, signal input end; Impel the 3rd also conducting of triode Q3, this moment, the base stage of the 7th triode Q7 had a high voltage generation, made the 7th also conducting of triode Q7; Make the base voltage of the triode Q1 that wins can become big; The first triode Q1 is ended, and then switching tube Q8 is also ended, thereby turn-off output.
Three, the defencive function of hardware switch protection module 103:
When hardware switch protection module 103 started, the conducting state of each triode was as shown in Figure 4 in the current foldback circuit.When the electrorheological through first resistance R 1 was big, the voltage at the 12 resistance R 12 two ends also became greatly, and since at this moment the voltage of DV133.0 high level be constant; So the voltage of the first triode Q1 emitter just diminishes, impel the voltage difference of the first triode Q1 emitter and base stage few, can not form enough base currents; So the first triode Q1 ends, this moment, the first triode Q1 did not have base voltage, and the base voltage that impels the 7th triode Q7 is greater than emitter voltage; So the 7th triode Q7 conducting, because the first triode Q1 ends second triode Q2 meeting conducting because its base voltage reduces; According to the description of front, switching tube also can reach the purpose that output is turn-offed in overcurrent protection by turn-offing output; Traditional current foldback circuit generally can reach such effect, but in case after turn-offing output, owing to there is not electric current to exist; The defencive function of current foldback circuit can be cancelled again, opens output once more automatically, if the load short circuits situation is not got rid of; Just again can short-circuit protection, make circuit be in the state of overcurrent-protection-overcurrent, the time one of going round and beginning again is long; Finally still can burn out the power drive pipe, then, hardware switch protection module 103 of the present invention has solved this problem.
After the first triode Q1 ends; Do not have output to cause the base voltage of the 4th triode Q4 to disappear,, will on the 5th resistance R 5, the 3rd diode D3, the 4th triode Q4, the 7th resistance R 7, the second triode Q2 and the 11 resistance R 11, will form electric current after the 4th triode Q4 conducting so the 4th triode Q4 will be in conducting state; And because its emitter and base voltage are constant 0.6V after the 3rd triode Q3 conducting; So this electric current still is constant, form the constant-current source circuit of a standard, just because of the existence of this constant-current source circuit; Even make that switching tube can not opened easily yet under the situation that does not have big electric current output; Thereby reach the effect that continues to shield, certainly because the conducting of the 3rd triode Q3 and the 4th triode Q4 still has high pressure through the 3rd triode Q3 and the 4th triode Q4 output; But the 3rd resistance R 3 and the 4th resistance R 4 (resistance of the 3rd resistance R 3 and the 4th resistance R 4 is 220K Ω) because the output of the three or three pipe has been connected respectively; Can only produce about 0.6 milliampere electric current, thus the state of circuit is not influenced, also just because of the existence of this 0.6 milliampere of electric current; Make constant-current source exist always, continue to shield.In case the external short circuit situation is really cancelled, this electric current of 0.6 milliampere has not just existed yet so, and the electric current of constant-current source is also cancelled; Make the 7th triode Q7 by, the first triode Q1 conducting; The also conducting of switching tube this moment, then can return to normal operating state, and; Because the overcurrent protection among the present invention is all accomplished by pure hardware, so can obtain the highest protection responsiveness.
In sum, current foldback circuit provided by the invention is compared with traditional current foldback circuit, and the traditional protection circuit is after protection takes place; Still need artificial maintenance and maintenance; Can only reduce the cost of maintenance as far as possible and extremely limited reduce maintenance times, but equally still can influence normal production, make production efficiency can't reach the highest; The invention provides a kind of current foldback circuit that possesses complete overcurrent protection function; No matter any make equipment in running under the situation that external loading is unusual or short circuit takes place, switching off load and maintenance are in off state rapidly, even how long short circuit can not cause device damage; And after needing only outside abnormal conditions eliminating under the situation about need not cut off the power supply, can recover normal operating conditions at once; Equipment is non-maintaining in operation process with regard to really having accomplished to make like this, the manpower-free intervenes, and not only reduced artificial cost but also greatly raised labour productivity, and the electronic component that this current foldback circuit adopts is conventional electronic component; The simple cost of its circuit structure is low, is fit to promote the use of.
It is understandable that, concerning those of ordinary skills, can be equal to replacement or change according to technical scheme of the present invention and inventive concept thereof, and all these changes or replacement all should belong to the protection range of the appended claim of the present invention.
Claims (10)
1. a current foldback circuit is characterized in that, comprising:
Be used to control the switch control module of the operating state of current foldback circuit;
Be used for high-low level state, the software switch protection module that corresponding control switch control module opens and closes according to control signal;
Be used for when loaded work piece perhaps cuts off the power supply unusually, controlling switch control module and close the hardware switch protection module that the control switch control module is opened when load is normal;
The input of said switch control module connects high level, and output connects load; Said software switch protection module is connected the control end of switch control module with the hardware switch protection module;
Said software switch protection module comprises and being used for when switch control module is closed; For hardware switch protection module, software switch protection module, switch control module power supply, make the state of hardware switch protection module, software switch protection module, switch control module remain the constant-current source module.
2. current foldback circuit according to claim 1 is characterized in that said switch control module comprises switching tube, the base stage connection hardware switch protection module of said switching tube, and collector electrode connects load, and emitter connects high level.
3. current foldback circuit according to claim 2 is characterized in that, also comprises the discharge module that is used for discharge when load is cut off the power supply, and said discharge module connects high level and switch control module.
4. current foldback circuit according to claim 3; It is characterized in that; Said discharge module comprises discharge diode and discharge resistance, and the positive pole of said discharge diode connects the collector electrode of switching tube, and negative pole connects the emitter of switching tube and an end of discharge resistance; One end of said discharge resistance also connects high level, other end ground connection.
5. current foldback circuit according to claim 1 is characterized in that, also comprises being used to the filtration module that load provides stable voltage, and said filtration module is connected between the output and load of switch control module.
6. current foldback circuit according to claim 5 is characterized in that said filtration module comprises filter capacitor, and an end of said filter capacitor connects load and switch control module, other end ground connection.
7. current foldback circuit according to claim 1; It is characterized in that said hardware switch protection module comprises first triode, second triode, the 4th triode, the 5th triode, the 7th triode, first electric capacity, first diode, the 3rd diode, second resistance, the 3rd resistance, the 4th resistance, the 7th resistance, the tenth resistance, the 11 resistance and the 12 resistance;
The base stage of said first triode connects the emitter of the 7th triode, also connects the collector electrode of the 5th triode via second resistance; The collector electrode of first triode connects an end of output and the 3rd resistance of switch control module, also is connected the base stage of the 4th triode via the 4th resistance, and said first transistor emitter connects the control end of switch control module, also connects high level, the collector electrode of the 7th triode, an end and the software switch protection module of first electric capacity via the 12 resistance; The other end of said first electric capacity connects the base stage of the 7th triode; The base stage of said the 7th triode connects the other end of software switch protection module and the 3rd resistance;
The collector electrode of said second triode connects the positive pole of first diode, also via the 11 grounding through resistance, the negative pole of said first diode connects high level; The emitter of said second triode connects the collector electrode of the 4th triode via the 7th resistance, and the base stage of second triode connects the collector electrode of the 5th triode; The emitter of said the 4th triode connects the positive pole of the 3rd diode, and the negative pole of the 3rd diode connects the software switch protection module; The base stage of said the 5th triode connects high level, and emitter is through the tenth grounding through resistance.
8. current foldback circuit according to claim 7 is characterized in that, said software switch protection module comprises the 3rd triode, the 6th triode, second diode, the 5th resistance, the 6th resistance, the 8th resistance and the 9th resistance;
The positive pole that the base stage of said the 3rd triode connects second diode is with the negative pole of the 3rd diode, also be connected the emitter of the 3rd triode, an end of first electric capacity and the collector electrode of the 7th triode via the 5th resistance, and the collector electrode of said the 3rd triode connects the other end of first electric capacity, the other end of the 3rd resistance and the base stage of the 7th triode;
One end of said the 8th resistance connects an end of the 5th resistance, and the other end connects the negative pole of second diode, also connects the collector electrode of the 6th triode via the 9th resistance; The base stage of the 6th triode connects high level, and emitter is via the 6th resistance connection control signal output.
9. current foldback circuit according to claim 8; It is characterized in that; Said first triode, second triode, the 3rd triode, the 4th triode, switching tube are the PNP triode, the 5th triode, the 6th triode and the seven or three utmost point and be the NPN triode.
10. current foldback circuit according to claim 8 is characterized in that, said constant-current source module comprises the 3rd triode and the 5th resistance.
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| CN201210125639.3A CN102629751B (en) | 2012-04-26 | 2012-04-26 | Over-current protection circuit |
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| CN201210125639.3A CN102629751B (en) | 2012-04-26 | 2012-04-26 | Over-current protection circuit |
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| CN102820638A (en) * | 2012-08-09 | 2012-12-12 | 深圳市九洲电器有限公司 | Overcurrent protection device and electronic equipment |
| CN102931630A (en) * | 2012-11-21 | 2013-02-13 | 重庆西南集成电路设计有限责任公司 | Overvoltage and overcurrent protection circuit with state holding function |
| CN104065028A (en) * | 2013-03-19 | 2014-09-24 | 台达电子工业股份有限公司 | Electronic fuse wire device and operation method thereof |
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| CN107450397A (en) * | 2017-08-18 | 2017-12-08 | 广东卓梅尼技术股份有限公司 | A kind of Over Current Protection System of device for producing hydrogen external equipment |
| CN107505878A (en) * | 2017-09-26 | 2017-12-22 | 惠州拓邦电气技术有限公司 | A kind of control circuit |
| CN110932238A (en) * | 2019-12-11 | 2020-03-27 | 武汉宝久创美科技有限公司 | Overcurrent and short-circuit protection circuit for electromagnetic brake |
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| CN113161984A (en) * | 2021-04-08 | 2021-07-23 | 广东博方众济医疗科技有限公司 | Dual overcurrent protection circuit and electric wheelchair |
| CN116299051A (en) * | 2023-05-19 | 2023-06-23 | 深圳市安科讯电子制造有限公司 | Overcurrent short circuit detection circuit and detection protection system |
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| CN102820638A (en) * | 2012-08-09 | 2012-12-12 | 深圳市九洲电器有限公司 | Overcurrent protection device and electronic equipment |
| CN102820638B (en) * | 2012-08-09 | 2014-10-29 | 深圳市九洲电器有限公司 | Overcurrent protection device and electronic equipment |
| CN102931630A (en) * | 2012-11-21 | 2013-02-13 | 重庆西南集成电路设计有限责任公司 | Overvoltage and overcurrent protection circuit with state holding function |
| CN102931630B (en) * | 2012-11-21 | 2015-06-10 | 重庆西南集成电路设计有限责任公司 | Overvoltage and overcurrent protection circuit with state holding function |
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| CN105591353A (en) * | 2016-02-24 | 2016-05-18 | 中国兵器工业集团第二一四研究所苏州研发中心 | Driving overcurrent protection circuit having anti-oscillation function |
| CN106802615A (en) * | 2017-01-10 | 2017-06-06 | 上海华测导航技术股份有限公司 | A kind of protection system for echo depth sounder |
| CN107450397A (en) * | 2017-08-18 | 2017-12-08 | 广东卓梅尼技术股份有限公司 | A kind of Over Current Protection System of device for producing hydrogen external equipment |
| CN107505878A (en) * | 2017-09-26 | 2017-12-22 | 惠州拓邦电气技术有限公司 | A kind of control circuit |
| CN110932238A (en) * | 2019-12-11 | 2020-03-27 | 武汉宝久创美科技有限公司 | Overcurrent and short-circuit protection circuit for electromagnetic brake |
| CN110932238B (en) * | 2019-12-11 | 2022-04-08 | 武汉宝久创美科技有限公司 | Overcurrent and short-circuit protection circuit for electromagnetic brake |
| CN111711162A (en) * | 2020-05-12 | 2020-09-25 | 河北领界电子科技有限公司 | Short-circuit protection circuit |
| CN111725787A (en) * | 2020-07-10 | 2020-09-29 | 广东敏华电器有限公司 | BOOST direct current short-circuit protection circuit that steps up |
| CN113161984A (en) * | 2021-04-08 | 2021-07-23 | 广东博方众济医疗科技有限公司 | Dual overcurrent protection circuit and electric wheelchair |
| CN116299051A (en) * | 2023-05-19 | 2023-06-23 | 深圳市安科讯电子制造有限公司 | Overcurrent short circuit detection circuit and detection protection system |
| CN116299051B (en) * | 2023-05-19 | 2023-07-21 | 深圳市安科讯电子制造有限公司 | Overcurrent short circuit detection circuit and detection protection system |
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