CN102629751B - Over-current protection circuit - Google Patents
Over-current protection circuit Download PDFInfo
- Publication number
- CN102629751B CN102629751B CN201210125639.3A CN201210125639A CN102629751B CN 102629751 B CN102629751 B CN 102629751B CN 201210125639 A CN201210125639 A CN 201210125639A CN 102629751 B CN102629751 B CN 102629751B
- Authority
- CN
- China
- Prior art keywords
- triode
- resistance
- connects
- module
- control module
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
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 design of electronic circuits; mainly export to can automatically shut down electric current when load short circuits or electric current become large suddenly; avoid burning out power drive pipe, cause high maintenance cost, but also the normal production of impact.
Conventional over-current protection method comprises: one, direct use standard over-current protection device (as fuse), can will burn fuse after overcurrent, so just only needs during maintenance to change fuse, and need not change expensive power drive pipe; Two, use resettable fuse, this method has good protected effect to momentary load short circuit, but once the load short circuits time is partially long, the self-recovering function of fuse can starting power driving tube again, final or power drive pipe can be caused to damage; Three, according to the special current foldback circuit of the principle design of resettable fuse; can be applied in specific environment for use; but they have a common shortcoming to be exactly that protection act is slow; guard mode cannot be remained on; also just thoroughly cannot avoid the damage of equipment, and just reduce the maintenance cost after device damage or reduction device damage within the specific limits by certain means as far as possible.
Summary of the invention
In view of above-mentioned the deficiencies in the prior art part; the object of the present invention is to provide a kind of current foldback circuit; no matter equipment is that external loading is abnormal in running; or short circuit occurs; current foldback circuit can switching off load remain in off state rapidly; even how long short circuit all can not cause device damage, as long as and can recover normal operating conditions when not needing power-off after outside abnormal conditions eliminating at once.
In order to achieve the above object, this invention takes following technical scheme:
A kind of current foldback circuit, it comprises:
For controlling the switch control module of the operating state of current foldback circuit;
For the low and high level state according to control signal, the software switch protection module that corresponding control switch control module opens and closes;
Closing for controlling switch control module when loaded work piece exception or power-off, controlling the hardware switch protection module that switch control module is opened when load is normal;
The input of described switch control module connects high level, and output connects load; The control end of described software switch protection module and hardware switch protection module connecting valve control module;
Described software switch protection module comprises for when switch control module is closed; for hardware switch protection module, software switch protection module, switch control module are powered, make the constant-current source module that the state of hardware switch protection module, software switch protection module, switch control module keeps.
In described current foldback circuit, described switch control module comprises switching tube, and the base stage of described switching tube connects hardware switch protection module, and collector electrode connects load, and emitter connects high level.
In described current foldback circuit, also comprise the discharge module for discharging when load power down, described discharge module connects high level and switch control module.
In described current foldback circuit; described discharge module comprises discharge diode and discharge resistance, the collector electrode of the positive pole connecting valve pipe of described discharge diode, the emitter of negative pole connecting valve pipe and one end of discharge resistance; one end of described discharge resistance also connects high level, other end ground connection.
In described current foldback circuit, also comprise the filtration module for providing stable voltage for load, described filtration module is connected between the output of switch control module and load.
In described current foldback circuit, described filtration module comprises filter capacitor, and one end of described filter capacitor connects load and switch control module, other end ground connection.
In described current foldback circuit, described hardware switch protection module comprises the first triode, the second triode, the 4th triode, the 5th triode, the 7th triode, the first electric capacity, the first diode, the 3rd diode, the 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 described first triode connects the emitter of the 7th triode, also connects the collector electrode of the 5th triode via the second resistance, the output of the collector electrode connecting valve control module of the first triode and one end of the 3rd resistance, the base stage being also connected the 4th triode via the 4th resistance, the control end of described first transistor emitter connecting valve control module, also connect high level, the collector electrode of the 7th triode, one end of the first electric capacity and software switch protection module via the 12 resistance; The other end of described first electric capacity connects the base stage of the 7th triode; The base stage of described 7th triode connects the other end of software switch protection module and the 3rd resistance;
The collector electrode of described second triode connect the first diode positive pole, also via the 11 grounding through resistance, the negative pole of described first diode connects high level; The emitter of described second triode connects the collector electrode of the 4th triode via the 7th resistance, the base stage of the second triode connects the collector electrode of the 5th triode; The emitter of described 4th triode connects the positive pole of the 3rd diode, and the negative pole of the 3rd diode connects software switch protection module; The base stage of described 5th triode connects high level, and emitter is by the tenth grounding through resistance.
In described current foldback circuit, described software switch protection module comprises the 3rd triode, the 6th triode, the second diode, the 5th resistance, the 6th resistance, the 8th resistance and the 9th resistance;
The base stage of described 3rd triode connects the negative pole of positive pole with the 3rd diode of the second diode, is also connected the collector electrode of the emitter of the 3rd triode, one end of the first electric capacity and the 7th triode via the 5th resistance, and the collector electrode of described 3rd triode connects the other end of the first electric capacity, the other end of the 3rd resistance and the base stage of the 7th triode;
One end of described 8th resistance connects one end of the 5th resistance, and the other end connects the negative pole of the 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 described current foldback circuit, described first triode, the second triode, the 3rd triode, the 4th triode, switching tube are PNP triode, the 5th triode, the 6th triode and the seven or three pole and be NPN triode.
In described current foldback circuit, described constant-current source module comprises the 3rd triode and the 5th resistance.
Compared to prior art, current foldback circuit provided by the invention, comprise switch control module, software switch protection module and hardware switch protection module, can by the needs of software switch protection module according to equipment actual motion, as controlled power saving when electric sequence or equipment time-out, carry out control switch control module and close output, also size of current by power drive pipe can automatically be detected by hardware, automatic control switch control module is closed and is exported, like this can with the fastest velocity interpolation defencive function, two kinds of protected modes merge, whenever when any one condition meets, protection comes into force, and, when the long-time short circuit of load, kept by constant-current source module closing the state exported, therefore how long short circuit all can not cause device damage, as long as outside abnormal conditions can recover normal operating conditions after getting rid of when not needing power-off at once, really accomplish to make that equipment is non-maintaining in operation process, manpower-free intervenes, not only reduced artificial cost but also greatly raise labour productivity.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of current foldback circuit of the present invention.
Fig. 2 is current foldback circuit of the present invention when normally working, the conducting state figure of each triode of current foldback circuit.
Fig. 3 is when in current foldback circuit of the present invention, software switch protection module starts, the conducting state figure of each triode of current foldback circuit.
Fig. 4 is when in current foldback circuit of the present invention, hardware switch protection module starts, the conducting state figure of each triode of current foldback circuit.
Embodiment
The invention provides a kind of current foldback circuit, for making object of the present invention, technical scheme and effect clearly, clearly, developing simultaneously referring to accompanying drawing, the present invention is described in more detail for embodiment.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Refer to 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 described switch control module 101 connects DV133.0 high level, and output connects load; The control end of described software switch protection module 102 and hardware switch protection module 103 connecting valve control module 101.Constant-current source module is comprised at described software switch protection module 102.
Wherein, switch control module 101 is for controlling the operating state of current foldback circuit; software switch protection module 102 is for the low and high level state according to control signal; corresponding control switch control module 101 opens and closes; hardware switch protection module 103 is closed for controlling switch control module 101 when loaded work piece exception or power-off, controls switch control module 101 open when load is normal.Whenever merged by software switch protection module 102 and hardware switch protection module 103 two kinds of modes, when any one condition meets, the output of automatic cut-off switch control module 101, makes protection come into force.Described constant-current source module is used for when switch control module 101 is closed; for hardware switch protection module 103, software switch protection module 102, switch control module 101 are powered; the state of hardware switch protection module 103, software switch protection module 102, switch control module 101 is kept; when load short circuits situation does not exist; the electric current of constant-current source module disappears immediately; switch control module 101 is opened automatically; achieve protective circuit keep can auto restore facility, both counteract each other, complement each other.
In the embodiment of the present invention; described switch control module 101 comprises switching tube Q8; the base stage (i.e. the control end of switch control module 101) of described switching tube Q8 connects hardware switch protection module 103; collector electrode (i.e. the output of switch control module 101) connects load, and emitter (i.e. the input of switch control module 101) connects DV133.0 high level.
Current foldback circuit provided by the invention also comprises the filtration module 105 for providing stable voltage for load, between the output that described filtration module 105 is connected on switch control module 101 and load.One end of this filtration module 105 filter capacitor CU1, described filter capacitor CU1 connects load and switch control module 101, other end ground connection.This filter capacitor CU1 is mainly and makes voltage slowly increase when device power, prevents the generation of surge voltage, causes late-class circuit system to be destroyed because of instantaneous pressure, and ensures the voltage stabilization in the whole course of work.
Due to the feature of the storage electricity of filter capacitor CU1, still will have remaining capacity after device powers down, and may maintain a period of time, remaining capacity makes late-class circuit be in a kind of not controlled state.During in order to prevent load power down; equipment live when avoiding manual operation; current foldback circuit provided by the invention also comprises the discharge module 104 for discharging when load power down; described discharge module 104 connects high level and switch control module 101; rapidly electricity residual in DV133.0 and load can be bled off in the moment of load power down and be reduced to 0V, ensure that the life safety of operating personnel.
Described discharge module 104 comprises discharge diode D4 and discharge resistance R13, the collector electrode of the positive pole connecting valve pipe Q8 of described discharge diode D4, the emitter of negative pole connecting valve pipe Q8 and one end of discharge resistance R13, one end of described discharge resistance R13 also connects high level, other end ground connection.
Please continue to refer to Fig. 1; in current foldback circuit provided by the invention, described 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, the first electric capacity C1, the first diode D1, the 3rd diode D3, the second resistance R2, the 3rd resistance R3, the 4th resistance R4, the 7th resistance R7, the tenth resistance R10, the 11 resistance R11 and the 12 resistance R12.
The base stage of described first triode Q1 connects the emitter of the 7th triode Q7, also connects the collector electrode of the 5th triode Q5 via the second resistance R2, the output of the collector electrode connecting valve control module 101 of the first triode Q1 and one end of the 3rd resistance R3, the base stage being also connected the 4th triode Q4 via the 4th resistance R4, the control end of described first triode Q1 emitter connecting valve control module 101, also connect DV133.0 high level, the collector electrode of the 7th triode Q7, one end of the first electric capacity C1 and software switch protection module 102 via the 12 resistance R12; The other end of described first electric capacity C1 connects the base stage of the 7th triode Q7; The base stage of described 7th triode Q7 connects the other end of software switch protection module 102 and the 3rd resistance R3.
The collector electrode of described second triode Q2 connect the first diode D1 positive pole, also via the 11 resistance R11 ground connection, the negative pole of described first diode D1 connects AV15.0 high level; The emitter of described second triode Q2 connects the collector electrode of the 4th triode Q4 via the 7th resistance R7, the base stage of the second triode Q2 connects the collector electrode of the 5th triode Q5; The emitter of described 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 described 5th triode Q5 connects AV15.0 high level, and emitter is by the tenth resistance R10 ground connection.
In current foldback circuit provided by the invention, described software switch protection module 102 comprises the 3rd triode Q3, the 6th triode Q6, the second diode D2, the 5th resistance R5, the 6th resistance R6, the 8th resistance R8 and the 9th resistance R9.This software switch protection module 102 and the first electric capacity C1 in hardware switch protection module 103, the 3rd resistance R3, the 12 resistance R12, 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.Described constant-current source module comprises the 3rd triode Q3 and the 5th resistance R5; this constant-current source module is after overcurrent protection; maintain and power to the first triode Q1, the 3rd triode Q3, the 7th triode Q7 and switching tube Q8, protect the conducting state of these triodes, until short-circuit conditions is cancelled.
The base stage of described 3rd triode Q3 connects the negative pole of positive pole with the 3rd diode D3 of the second diode D2, is also connected the collector electrode of the emitter of the 3rd triode Q3, one end of the first electric capacity C1 and the 7th triode Q7 via the 5th resistance R5, and the collector electrode of described 3rd triode Q3 connects the other end of the first electric capacity C1, the other end of the 3rd resistance R3 and the base stage of the 7th triode Q7.
One end of described 8th resistance R8 connects one end of the 5th resistance R5, 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 R9; The base stage of the 6th triode Q6 connects AV15.0 high level, and emitter is via the 6th resistance R6 connection control signal output.
Wherein, the type of the present invention to each triode also needs relevant regulations, described first triode Q1, the second triode Q2, the 3rd triode Q3, the 4th triode Q4, switching tube are PNP triode, the 5th triode Q5, the 6th triode Q6 and the seven or three pole and be NPN triode.
Please again consult Fig. 1; in current foldback circuit provided by the invention; the first resistance R1 is in series with between the emitter and the negative pole of discharge diode D4 of switching tube Q8; this first resistance R1 is sampling resistor; for detecting the size of the electric current in primary path; when ER effect is large, the voltage at the first resistance R1 two ends becomes large 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 described in detail:
One, normal operating conditions:
Time less by the current ratio of the first resistance R1, the voltage at the 12 resistance R12 two ends is also smaller, and due to the voltage of DV133.0 high level be constant, so the voltage of the first triode Q1 emitter is also just larger, impel the first triode Q1 conducting, after first triode Q1 conducting, electric current is through the 12 resistance R12, first triode Q1, second resistance R2, 5th triode Q5, tenth resistance R10 forms current circuit to ground, thus make switching tube Q8 base stage generation current, make switching tube conducting, now switching tube Q8 is in normal open mode, make the conducting state of each triode in current foldback circuit as shown in Figure 2, software switch protection module 102 and hardware switch protection module 103 are all failure to actuate.
Two, the defencive function of software switch protection module 102:
When software switch protection module 102 starts, in current foldback circuit, the conducting state of each triode as shown in Figure 3.When control signal output exports control signal off, (this control signal off is controlled to export by software program, when the abnormal not deal with data of software work, now control signal off is high level, i.e. open-circuit condition), and when off signal be high level (i.e. DV15.0) or open circuit time, 6th triode Q6 base stage does not have electric current to produce, therefore be in cut-off state, therefore the 9th resistance R9 does not have electric current to produce yet, its both end voltage is equal, similarly, 8th resistance R8, second diode D2, the voltage at the 5th resistance R5 two ends is also identical, so the voltage at the 3rd triode Q3 base stage and emitter two ends is equal, electric current is not had 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 are all in conducting, once off signal is dragged down as 0V, 6th triode Q6 conducting, electric current is had to produce, electric current is through the 5th resistance R5, second diode D2, 9th resistance R9, 6th triode Q6, 6th resistance R6, control signal input forms current circuit, impel the 3rd triode Q3 also conducting, now the base stage of the 7th triode Q7 has a high voltage generation, make the 7th triode Q7 also conducting, make the base voltage of the first triode Q1 can become large, first triode Q1 is ended, and then switching tube Q8 is also ended, thus turn off output.
Three, the defencive function of hardware switch protection module 103:
When hardware switch protection module 103 starts, in current foldback circuit, the conducting state of each triode as shown in Figure 4.When large by the ER effect of the first resistance R1, the voltage at the 12 resistance R12 two ends also becomes large, and due to the voltage of now 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, enough base currents can not be formed, therefore the first triode Q1 ends, now the first triode Q1 does not have base voltage, the base voltage of the 7th triode Q7 is impelled to be 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 description above, switching tube also can end shutoff and export, reach overcurrent protection and turn off the object exported, traditional current foldback circuit generally can reach such effect, but once after turning off output, owing to there is no electric current, the defencive function of current foldback circuit can be cancelled again, again automatically open output, if load short circuits situation is not got rid of, just again can short-circuit protection, circuit is made to be in the state of overcurrent-protection-overcurrent, time one of going round and beginning again is long, finally still power drive pipe can be burnt out, then, hardware switch protection module 103 of the present invention solves this problem.
After the first triode Q1 ends, not having to export causes the base voltage of the 4th triode Q4 to disappear, so the 4th triode Q4 will be in conducting state, will at the 5th resistance R5 after 4th triode Q4 conducting, 3rd diode D3, 4th triode Q4, 7th resistance R7, second triode Q2 and the 11 resistance R11 will form electric current, and because its emitter and base voltage are constant 0.6V after the 3rd triode Q3 conducting, so this electric current or constant, form the constant-current source circuit of a standard, just because of the existence of this constant-current source circuit, even if make the switching tube when not having High-current output also can not open easily, thus reach the effect continuing to shield, certainly due to the conducting of the 3rd triode Q3 and the 4th triode Q4, still have high pressure to be exported by the 3rd triode Q3 and the 4th triode Q4, but because the output of the three or three pipe has been connected respectively, the resistance of the 3rd resistance R3 and the 4th resistance R4(the 3rd resistance R3 and the 4th resistance R4 is 220K Ω), the electric current of about 0.6 milliampere can only be produced, so do not affect the state of circuit, also just because of the existence of this 0.6 milliampere of electric current, constant-current source is existed always, continue to shield.Once external short circuit situation is really cancelled; so this electric current of 0.6 milliampere is not also just present in; the electric current of constant-current source is also cancelled; make the 7th triode Q7 cut-off, the first triode Q1 conducting; now switching tube also conducting, so normal operating state can be returned to, and; because the overcurrent protection in the present invention is all completed by pure hardware, so the highest protection act speed can be obtained.
In sum, current foldback circuit provided by the invention is compared with traditional current foldback circuit, conventional protection circuit is after protection occurs, still need artificial maintenance, the number of times that maintenance is limitedly reduced in the cost of maintenance and pole can only be reduced as far as possible, but equally still can affect normal production, make production efficiency cannot reach the highest, the invention provides a kind of current foldback circuit possessing complete overcurrent protection function, when making equipment no matter any external loading exception or short circuit occur in running, can switching off load remain in off state rapidly, even how long short circuit all can not cause device damage, as long as and outside abnormal conditions can recover normal operating conditions after getting rid of when not needing power-off at once, so just really accomplish to make equipment non-maintaining in operation process, manpower-free intervenes, not only reduce artificial cost but also greatly raise 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, be applicable to promoting the use of.
Be understandable that, for those of ordinary skills, can be equal to according to technical scheme of the present invention and inventive concept thereof and replace or change, and all these change or replace the protection range that all should belong to the claim appended by the present invention.
Claims (6)
1. a current foldback circuit, is characterized in that, comprising:
For controlling the switch control module of the operating state of current foldback circuit;
For the low and high level state according to control signal, the software switch protection module that corresponding control switch control module opens and closes;
Closing for controlling switch control module when loaded work piece exception or power-off, controlling the hardware switch protection module that switch control module is opened when load is normal;
The input of described switch control module connects high level, and output connects load; The control end of described software switch protection module and hardware switch protection module connecting valve control module;
Described software switch protection module comprises for when switch control module is closed, for hardware switch protection module, software switch protection module, switch control module are powered, the state of hardware switch protection module, software switch protection module, switch control module is made to remain constant-current source module;
Described switch control module comprises switching tube, and the base stage of described switching tube connects hardware switch protection module, and collector electrode connects load, and emitter connects high level;
Described current foldback circuit, also comprises the discharge module for discharging when load power down, and described discharge module connects high level and switch control module; Described discharge module comprises discharge diode and discharge resistance, the collector electrode of the positive pole connecting valve pipe of described discharge diode, the emitter of negative pole connecting valve pipe and one end of discharge resistance, and one end of described discharge resistance also connects high level, other end ground connection; Described discharge module is used for being bled off by electricity residual in DV133.0 and load rapidly in the moment of load power down;
Described hardware switch protection module comprises the first triode, the second triode, the 4th triode, the 5th triode, the 7th triode, the first electric capacity, the first diode, the 3rd diode, the 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 described first triode connects the emitter of the 7th triode, also connects the collector electrode of the 5th triode via the second resistance, the output of the collector electrode connecting valve control module of the first triode and one end of the 3rd resistance, the base stage being also connected the 4th triode via the 4th resistance, the control end of described first transistor emitter connecting valve control module, also connect high level, the collector electrode of the 7th triode, one end of the first electric capacity and software switch protection module via the 12 resistance; The other end of described first electric capacity connects the base stage of the 7th triode; The base stage of described 7th triode connects the other end of software switch protection module and the 3rd resistance;
The collector electrode of described second triode connect the first diode positive pole, also via the 11 grounding through resistance, the negative pole of described first diode connects high level; The emitter of described second triode connects the collector electrode of the 4th triode via the 7th resistance, the base stage of the second triode connects the collector electrode of the 5th triode; The emitter of described 4th triode connects the positive pole of the 3rd diode, and the negative pole of the 3rd diode connects software switch protection module; The base stage of described 5th triode connects high level, and emitter is by the tenth grounding through resistance.
2. current foldback circuit according to claim 1, is characterized in that, also comprise the filtration module for providing stable voltage for load, described filtration module is connected between the output of switch control module and load.
3. current foldback circuit according to claim 2, is characterized in that, described filtration module comprises filter capacitor, and one end of described filter capacitor connects load and switch control module, other end ground connection.
4. current foldback circuit according to claim 1, is characterized in that, described software switch protection module comprises the 3rd triode, the 6th triode, the second diode, the 5th resistance, the 6th resistance, the 8th resistance and the 9th resistance;
The base stage of described 3rd triode connects the negative pole of positive pole with the 3rd diode of the second diode, is also connected the collector electrode of the emitter of the 3rd triode, one end of the first electric capacity and the 7th triode via the 5th resistance, and the collector electrode of described 3rd triode connects the other end of the first electric capacity, the other end of the 3rd resistance and the base stage of the 7th triode;
One end of described 8th resistance connects one end of the 5th resistance, and the other end connects the negative pole of the 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.
5. current foldback circuit according to claim 4; it is characterized in that; described first triode, the second triode, the 3rd triode, the 4th triode, switching tube are PNP triode, the 5th triode, the 6th triode and the seven or three pole and be NPN triode.
6. current foldback circuit according to claim 4, is characterized in that, described constant-current source module comprises the 3rd triode and the 5th resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210125639.3A CN102629751B (en) | 2012-04-26 | 2012-04-26 | Over-current protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210125639.3A CN102629751B (en) | 2012-04-26 | 2012-04-26 | Over-current protection circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102629751A CN102629751A (en) | 2012-08-08 |
| CN102629751B true CN102629751B (en) | 2015-05-13 |
Family
ID=46587944
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210125639.3A Active CN102629751B (en) | 2012-04-26 | 2012-04-26 | Over-current protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102629751B (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
| CN104065028B (en) * | 2013-03-19 | 2017-03-01 | 台达电子工业股份有限公司 | Electronic insurance silk device and its operational approach |
| CN105591353B (en) * | 2016-02-24 | 2018-11-16 | 中国兵器工业集团第二一四研究所苏州研发中心 | A kind of driving current foldback circuit with anti-oscillation functions |
| CN106802615B (en) * | 2017-01-10 | 2022-01-28 | 上海华测导航技术股份有限公司 | Protection system for echo 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 |
| 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 |
| CN111711162B (en) * | 2020-05-12 | 2022-03-18 | 河北领界电子科技有限公司 | Short-circuit protection circuit |
| CN111725787B (en) * | 2020-07-10 | 2022-12-02 | 广东敏华电器有限公司 | BOOST direct current short-circuit protection circuit that steps up |
| CN113161984B (en) * | 2021-04-08 | 2023-04-11 | 广东博方众济医疗科技有限公司 | Dual overcurrent protection circuit and electric wheelchair |
| 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 |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201213222Y (en) * | 2008-06-10 | 2009-03-25 | 中兴通讯股份有限公司 | Rear stage working circuit protecting device for dual path electric power supplying system |
| CN201570846U (en) * | 2009-09-03 | 2010-09-01 | 福州瑞盛继保工程技术有限公司 | Bi-feedback DC power short-circuit protection circuit |
| CN201742080U (en) * | 2010-04-28 | 2011-02-09 | 上海力申科学仪器有限公司 | Frequency converter differential input overcurrent protection circuit for centrifugal machine |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201466700U (en) * | 2009-07-31 | 2010-05-12 | 上海宝康电子控制工程有限公司 | Overcurrent protection back plate device |
| CN202586263U (en) * | 2012-04-26 | 2012-12-05 | 深圳市汉拓数码有限公司 | Overcurrent protection circuit |
-
2012
- 2012-04-26 CN CN201210125639.3A patent/CN102629751B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201213222Y (en) * | 2008-06-10 | 2009-03-25 | 中兴通讯股份有限公司 | Rear stage working circuit protecting device for dual path electric power supplying system |
| CN201570846U (en) * | 2009-09-03 | 2010-09-01 | 福州瑞盛继保工程技术有限公司 | Bi-feedback DC power short-circuit protection circuit |
| CN201742080U (en) * | 2010-04-28 | 2011-02-09 | 上海力申科学仪器有限公司 | Frequency converter differential input overcurrent protection circuit for centrifugal machine |
Non-Patent Citations (1)
| Title |
|---|
| 基于数字电位器的可编程稳压器设计;沙占友等;《电源技术应用》;20070331;第10卷(第3期);第2页至第3页，图1，图4 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102629751A (en) | 2012-08-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102629751B (en) | Over-current protection circuit | |
| CN203056953U (en) | Driver and bus capacitor discharge circuit thereof | |
| CN204156500U (en) | Overcurrent-overvoltage protecting circuit | |
| CN202586263U (en) | Overcurrent protection circuit | |
| CN103956721B (en) | Battery anti-explosion circuit and battery charger | |
| CN205389123U (en) | Current foldback circuit of battery | |
| CN103346553A (en) | Reverse-connection-resisting and relay-coil-short-circuit-resisting control circuit of electronic controller | |
| CN204290266U (en) | A kind of current foldback circuit | |
| CN203491680U (en) | Automatic reset electric leakage overvoltage/undervoltage protection circuit | |
| CN205231727U (en) | Switching power supply output connects battery to join conversely protection automatic control circuit | |
| CN204858537U (en) | Battery discharge short -circuit protection circuit | |
| CN104332945A (en) | High-speed digital output circuit with overcurrent protection and integrated circuit | |
| CN101877475B (en) | Power supply short-circuit protection circuit | |
| CN103826363A (en) | Hot-plugging protection circuit for LED illuminating apparatus | |
| CN204230865U (en) | A kind of motor protecting device | |
| CN203415950U (en) | Electricity-using device input soft start resistor protection circuit | |
| CN102946088B (en) | Switch-on/off control circuit for electric meter relay and intelligent electric meter | |
| CN205248194U (en) | Drive circuit of relay | |
| CN213661197U (en) | Short-circuit protection circuit based on Hall current sensor and voltage comparator | |
| CN204216634U (en) | A kind of inversion of uninterrupted power supply and maintenance bypass interlock circuit | |
| CN207021659U (en) | A kind of DC protection circuit | |
| CN205141638U (en) | Switching power supply output short circuit disconnection protection circuit | |
| CN104427690A (en) | Protection circuit | |
| CN208797826U (en) | A kind of short-circuit protection of external load | |
| CN202841629U (en) | Solar energy boost LED driving power supply with protection function |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |