CN209265232U - Overcurrent protection circuit and equipment - Google Patents
Overcurrent protection circuit and equipment Download PDFInfo
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- CN209265232U CN209265232U CN201920206216.1U CN201920206216U CN209265232U CN 209265232 U CN209265232 U CN 209265232U CN 201920206216 U CN201920206216 U CN 201920206216U CN 209265232 U CN209265232 U CN 209265232U
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Abstract
The utility model discloses an overcurrent protection circuit and equipment relates to drive technical field. The overcurrent protection circuit includes: the protection module and the current equalizing module; the first input end of the protection module is connected with the first detection end of the current-sharing module, the second input end of the protection module is connected with the second detection end of the current-sharing module, and the output end of the protection module is connected with the control end of the current-sharing module; the protection module outputs an adjusting voltage signal to the control end according to the voltage signal of the first detection end and/or the second detection end so as to control the current of the current equalizing module. Utilize the utility model discloses an overcurrent protection circuit can effectively solve prior art and lead to the technical problem that the device damaged under the condition that the circuit produced the heavy current, has realized the overcurrent protection to the circuit, and then has protected the circuit device.
Description
Technical field
The utility model relates to actuation techniques field more particularly to a kind of current foldback circuit and equipment.
Background technique
Traditional Switching Power Supply, in the load of direct parallel drive, since the internal resistance of load in parallel has deviation, electricity
Road exports the non-mean allocation of electric current.At this time, it may be necessary to increase a flow equalizing circuit in Switching Power Supply to distribute per electric current all the way.
However, the flow equalizing circuit in traditional Switching Power Supply is larger in the parameter differences of triode, or load is damaged
When bad or short circuit, high current can be generated in circuit, and high current can make triode or load continuous generate heat or impact circuit, for a long time
Work will lead to device failure, even result in safety problem.
Utility model content
A kind of current foldback circuit provided by the utility model and equipment, in the case where circuit generates high current, effectively
Protect circuit devcie.
In a first aspect, the utility model embodiment provides a kind of current foldback circuit, comprising: protective module and stream mould
Block；
The first input end of the protective module is connect with the first test side of the current-sharing module, the protective module
Second input terminal is connect with the second test side of the current-sharing module, the output end of the protective module and the current-sharing module
Control terminal connection；
Wherein, the protective module is according to the voltage signal of first test side and/or the second test side, to the control
Output adjustment voltage signal in end processed, to control the electric current of the current-sharing module.
Optionally, the protective module includes protection location, input isolated location and output isolated location；
It is described input isolated location first input end connect with the first test side of the current-sharing module, it is described input every
The second input terminal from unit is connect with the second test side of the current-sharing module, the output end of the input isolated location and institute
State the first input end connection of protection location；
The input terminal of the output isolated location is connect with the output end of the protection location, the output isolated location
Output end is connect with the control terminal of the current-sharing module；
Wherein, voltage signal and the protection location second of the protection location based on the input isolated location output
The reference voltage signal that input terminal receives exports control voltage signal to the output isolated location；
The output isolated location is electric according to the control terminal output adjustment of the control voltage signal to the current-sharing module
Press signal.
Optionally, the input isolated location includes first diode and the second diode, the output isolated location packet
Include third diode；
The first end of the first diode is connect with the first test side of the current-sharing module, the first diode
Second end connects the first end of second diode and the first input end of the protection location；
The second end of second diode is connect with the second test side of the current-sharing module；
The first end of the third diode is connect with the control terminal of the current-sharing module, and the second of the third diode
End is connect with the output end of the protection location.
Optionally, the protection location is voltage comparator.
Optionally, the current-sharing module includes: to flow submodule and control submodule；
The control terminal for flowing submodule is connect with the output end of the control submodule, and the of the stream submodule
One test side is connect with the first input end of the protective module, second test side for flowing submodule and the protection mould
Second input terminal of block connects；
The control terminal of the control submodule is connect with the output end of the protective module.
Optionally, the stream submodule includes that the first stream unit and second flows unit；
Described first control terminal for flowing unit connects the described second control terminal and the control submodule for flowing unit
Output end, described first flow unit test side connect with the first input end of the protective module；
Described second test side for flowing unit is connect with the second input terminal of the protective module.
Optionally, the described first stream unit includes the first transistor and first resistor, and the described second stream unit includes
Second transistor and second resistance；
The first end of the first transistor connect the first resistor first end and the protective module it is first defeated
Enter end, the control terminal of the first transistor connects the output of the control terminal and the control submodule of the second transistor
End；
The first end of the second transistor connect the second resistance first end and the protective module it is second defeated
Enter end；
The second end of the first resistor connects the second end of the second resistance.
Optionally, the control submodule includes: third transistor, the 4th transistor and 3rd resistor；
The control terminal of the third transistor connect the 3rd resistor first end and the 4th transistor first
End, the first end of the third transistor connect the second end of the 3rd resistor；
The control terminal of 4th transistor connects the output of the second end and the protective module of the third transistor
End, the second end of the 4th transistor connect the second end of the first resistor.
Optionally, the first transistor, second transistor, third transistor and the 4th transistor are that triode or field are imitated
Ying Guan.
Second aspect, the utility model embodiment additionally provide a kind of equipment, comprising: provided by the embodiment of the utility model
Current foldback circuit.
The utility model embodiment provides a kind of current foldback circuit and equipment, by protective module according to the first detection
The voltage signal at end and/or the second test side, to the control terminal output adjustment voltage signal of current-sharing module, to control current-sharing module
Electric current, and then realize overcurrent protection to circuit.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of one of the utility model embodiment current foldback circuit；
Fig. 2 is the structural schematic diagram of another current foldback circuit in the utility model embodiment；
Fig. 3 is the circuit diagram of one of the utility model embodiment current foldback circuit；
Fig. 4 is the structural schematic diagram of another current foldback circuit in the utility model embodiment；
Fig. 5 is the structural schematic diagram of another current foldback circuit in the utility model embodiment.
Specific embodiment
The utility model is described in further detail with reference to the accompanying drawings and examples.It is understood that herein
Described specific embodiment is used only for explaining the utility model, rather than the restriction to the utility model.It further needs exist for
It is bright, part relevant to the utility model is illustrated only for ease of description, in attached drawing rather than entire infrastructure.
Fig. 1 is the structural schematic diagram of one of the utility model embodiment current foldback circuit, and the present embodiment is applicable
In in the case where circuit abnormality, the case where effective protection circuit devcie, specifically, this implementation is applicable to generate in circuit
When high current, effective protection circuit devcie, such as the case where protection current-sharing module.The current foldback circuit can integrate practical at this
In the equipment of novel offer.
As shown in Figure 1, a kind of current foldback circuit provided by the embodiment of the utility model, comprising: protective module 11 and
Flow module 12；
The first input end of protective module 11 is connect with the first test side of current-sharing module 12, and the second of protective module 11 is defeated
Enter end to connect with the second test side of current-sharing module 12, the output end of protective module 11 is connect with the control terminal of current-sharing module 12；
Wherein, protective module 11 is exported to control terminal and is adjusted according to the voltage signal of the first test side and/or the second test side
Whole voltage signal, to control the electric current of current-sharing module 12.
In the present embodiment, the working principle of the current foldback circuit is: the first input end of protective module 11 with flow
First test side of module 12 connects, the second input terminal of protective module 11 and the second test side of current-sharing module 12, with basis
Control terminal output adjustment voltage signal from the voltage signal of first test side and/or the second test side to current-sharing module 12, with control
The electric current of current-sharing module 12 processed, to realize overcurrent protection to circuit.
In the present embodiment, protective module 11 can be understood as the module that overcurrent protection is carried out in current foldback circuit.?
Flow module 12 can be understood as the module flowed in current foldback circuit.Protective module 11 can by first input end and
Second input terminal detects the voltage signal of current-sharing module 12, with the voltage signal that basis detects, to control module 12
Control terminal output adjustment voltage signal, to control the electric current of current-sharing module 12.
It is understood that the stream output of current foldback circuit may be implemented in current-sharing module 12, therefore current-sharing module 12 can
To include at least two output ends, the output electric current of each output end is identical.In order to be carried out to each output loop in the present embodiment
Flow monitoring, can be detected by the first input end of protective module 11 and the second input terminal current-sharing module 12 the first test side and
What short circuit or unevenness were flowed in the voltage signal of the second test side, control of the realization to 12 electric current of current-sharing module, and then realization
Protective effect.
It should be noted that the first test side of current-sharing module 12 and the number of the second test side do not limit in the present embodiment
Fixed, current-sharing module 12 may include at least one first input end and at least one second input terminal.Correspondingly, protective module 11
First input end and the number of the second input terminal be not construed as limiting, protective module 11 may include at least one first input end and
At least one second input terminal can make the number phase of the number of the input terminal of protective module 11 with 12 test side of current-sharing module
Together.It is understood that current-sharing module 12, which can be realized a few Lu Junliu outputs, can be arranged several test sides.
In addition, the power end of current-sharing module 12 can connect the power supply end of current foldback circuit, for current-sharing module
12 power supplies.
A kind of current foldback circuit is present embodiments provided, is examined by protective module according to the first test side and/or second
The voltage signal for surveying end, to the control terminal output adjustment voltage signal of current-sharing module, to control the electric current of current-sharing module, Jin Ershi
Now to the overcurrent protection of circuit.
Further, Fig. 2 is the structural schematic diagram of another current foldback circuit in the utility model embodiment, is such as schemed
Shown in 2, protective module 11 includes protection location 110, input isolated location 111 and output isolated location 112；
Input isolated location 111 first input end 111a connect with the first test side 12a of current-sharing module 12, input every
The second input terminal 111b from unit 111 is connect with the second test side 12b of current-sharing module 12, inputs the defeated of isolated location 111
Outlet 111c is connect with the first input end 110a of protection location 110；
The input terminal 112a of output isolated location 112 is connect with the output end 110b of protection location 110, exports isolated location
112 output end 112b is connect with the control terminal 12c of current-sharing module 12；
Wherein, voltage signal and protection location 110 second of the protection location 110 based on the input output of isolated location 111 are defeated
Enter the reference voltage signal for holding 110c to receive, to the output output control voltage signal of isolated location 112；
It exports isolated location 112 and is believed according to control voltage signal to the control terminal 12c output adjustment voltage of current-sharing module 12
Number.
Wherein, protection location 110 can be understood as the unit that voltage signal processing is carried out in protective module 11, based on defeated
The reference voltage signal that second input terminal 110c of the voltage signal and protection location 110 that enter the output of isolated location 111 is received,
Output control voltage signal.Input isolated location 111 can be understood as the unit that voltage signal input is carried out in protective module 11.
Output isolated location 112 can be understood as the unit that voltage signal output is carried out in protective module 11.
Input isolated location 111 is connect by first input end 111a with the first test side 12a of current-sharing module 12, is passed through
Second input terminal 111b is connect with the second test side 12b of current-sharing module 12, to obtain the electricity that current-sharing module 12 respectively exports branch
Press signal.Input isolated location 111 is connect by output end 111c with the first input end 110a of protection location 110, with to guarantor
The voltage signal that unit 110 exports the first test side 12a and/or the second test side 12b is protected, is handled for protection location 110.
It is understood that input isolated location 111 can be according to the electricity of the first test side 12a and the second test side 12b
Pressure value determines the voltage signal that the first test side 12a and/or the second test side 12b is exported to protection location 110.
The output that the biggish test side of voltage value carries out voltage signal can be chosen by such as inputting isolated location 111, exemplary
, when the voltage value of the first test side 12a is 5v, and the voltage value of the second test side 12b is 3v, input isolated location 111 can
To export the voltage signal of the first test side 12a to protection location 110.
Protection location 110 can be with join protection unit 110 after receiving the voltage signal that input isolated location 111 exports
The reference voltage signal that second input terminal 110c is received, output control voltage signal.Specifically, protection location 110 can be with base
Size between the voltage signal and reference voltage signal that input isolated location 111 exports is believed to generate corresponding control voltage
Number, control terminal 12c output adjustment voltage signal of the isolated location 112 to current-sharing module 12 is exported with triggering.
Illustratively, the numerical value of the voltage signal exported when input isolated location 111 is less than the numerical value of reference voltage signal,
Then 110 output end of protection location can export the control voltage signal of high level, and current foldback circuit can work normally at this time；
When the numerical value for the voltage signal that input isolated location 111 exports is greater than the numerical value of reference voltage signal, then protection location 110 exports
End can export low level control voltage signal, and the current-sharing module 12 in current foldback circuit can enter overcurrent protection at this time
Working condition such as executes open-circuit operation.
It should be noted that the numerical value for the voltage signal that input isolated location 111 exports is equal to the number of reference voltage signal
When value, protection location 110 can export the control voltage signal of high level, can also export low level control voltage signal,
It is not defined herein.
The input terminal 112a of output isolated location 112 is connect with the output end 110b of protection location 110, single to receive protection
The control voltage signal of the output end 110b output of member 110, then passes through the output end 112b Xiang Junliu of output isolated location 112
The control terminal 12c output adjustment voltage signal of module 12, to control the electric current of current-sharing module 12.
Based on the above technical solution, Fig. 3 is the electricity of one of the utility model embodiment current foldback circuit
Lu Tu.As shown in figure 3, input isolated location 111 includes first diode DA and the second diode DB, isolated location 112 is exported
Including third diode D；
The first end of first diode DA is connect with the first test side of current-sharing module 12, the second end of first diode DA
Connect the first end of the second diode DB and the first input end of protection location 110；
The second end of second diode DB is connect with the second test side 12b of current-sharing module 12；
The first end of third diode D is connect with the control terminal 12c of current-sharing module 12, the second end of third diode D with
The output end 110b connection of protection location 110.
Wherein, the first end of first diode DA can be the positive terminal of first diode DA, i.e. input isolated location 111
First input end 111a；The first end of second diode DB can be the negative pole end of the second diode；First diode DA's
The connecting pin of second end and the first end of the second diode DB can be used as the output end 111c of input isolated location 111；Second
The second end of diode DB can be the positive terminal of the second diode DB, it can for the second input of input isolated location 111
Hold 111b；The first end of third diode D can be the positive terminal of third diode D, it can for output isolated location 112
Output end 112b；The second end of third diode D can be the negative pole end of third diode D, it can for output isolated location
112 input terminal 112a.
In the present embodiment, input isolated location 111 can carry out the input of voltage signal, and according to the feature of diode
Signal isolation can be carried out, to protect circuit.
As shown in figure 3, protection location 110 is voltage comparator.Protection location 110 can be received based on first input end
Voltage signal and the second input terminal receive reference voltage signal V_REF output control voltage signal.Wherein, protection location
110 first input end can be the reverse input end of voltage comparator, and the second input terminal of protection location 110 can be voltage
The non-inverting input terminal of comparator.The specific value of reference voltage signal is not defined in the present embodiment, art technology
Personnel can set in conjunction with actual use demand, and corresponding voltage value is set when such as can be according to circuit overcurrent.
Further, Fig. 4 is the structural schematic diagram of another current foldback circuit in the utility model embodiment, is such as schemed
Shown in 4, current-sharing module 12 includes: to flow submodule 121 and control submodule 122；
The control terminal 121a for flowing submodule 121 is connect with the output end 122a of control submodule 122, stream submodule
121 the first test side 121b is connect with the first input end 11a of protective module 11, flows the second test side of submodule 121
121c is connect with the second input terminal 11b of protective module 11；The control terminal 122b of control submodule 122 is defeated with protective module 11
Outlet 11c connection.
Wherein, control submodule 122 can be understood as the submodule that 121 working condition of submodule is flowed in control, such as control
Flow the on off operating mode and/or current value of submodule 121.The power end of control submodule 122 can connect current foldback circuit
Power supply end, with can be stream submodule 121 power.
Control submodule 122 receives adjustment voltage by the control terminal 122b that the output end 11c with protective module 11 is connect
Signal, and pass through 121 output voltage signal of control terminal of output end 122a Xiang Junliu submodule 121, to realize to stream submodule
The control of block 121.Flow the of the first test side 121b and the second test side 121c of submodule 121 respectively with protective module 11
One input terminal 11a and the second input terminal 11b connection, carried out for protective module 11 to 11 output voltage signal of protective module
Stream detection.
Wherein, the first test side 121b and the second test side 121c for flowing submodule 121 can be used as stream mould respectively
The the first test side 12a and the second test side 12b of block 12；The control terminal 122b of control submodule 122 can be used as current-sharing module
12 control terminal 12c.
Further, Fig. 5 is the structural schematic diagram of another current foldback circuit in the utility model embodiment, is such as schemed
Shown in 5, stream submodule 121 includes that the first stream unit 1211 and second flows unit 1212；
Control terminal 1212a and the control of unit 1212 are flowed in the first control terminal 1211a connection second for flowing unit 1211
The output end 122a of submodule 122, first flows the first input end of the test side 1211b of unit 1211 and protective module 11
11a connection；
The second test side 1212b for flowing unit 1212 is connect with the second input terminal 11b of protective module 11.
Wherein, first flow unit 1211 and second stream unit 1212 can be understood as current-sharing module 12 output return
Road, the first stream unit 1211 and the second stream unit 1212 can be realized stream output under the control of control submodule 122.
The control terminal 1212a that the first control terminal 1211a and second for flowing unit 1211 flows unit 1212 can be used as stream submodule
The control terminal 121a of block 121；The first test side 1211b for flowing unit 1211 can be used as the first inspection for flowing submodule 121
End 121b is surveyed, the second test side 1212b for flowing unit 1212 can be used as the second test side 121c for flowing submodule 121.
Based on the above technical solution, as shown in figure 3, the first stream unit 1211 includes the first transistor TA and the
One resistance RA, the second stream unit 1212 includes second transistor TB and second resistance RB；
The first end of the first end connection first resistor RA of the first transistor TA and the first input end of protective module 11, the
The control terminal of the control terminal connection second transistor TB of one transistor TA and the output end of control submodule 122；
The first end of the first end connection second resistance RB of second transistor TB and the second input terminal of protective module 11；
The second end of the second end connection second resistance RB of first resistor RA.
It is understood that the first transistor TA and second transistor TB may include triode or field-effect tube, herein
The concrete type of the first transistor TA and second transistor TB are not defined.Exemplary property, as the first transistor TA
When for triode, the first end of the first transistor TA can be the emitter of the first transistor TA, and flow unit as first
1211 test side；The control terminal of the first transistor TA can be the base stage of triode, and can be used as first and flow unit
1211 control terminal；The first end of second transistor TB can be the emitter of triode, and flow unit 1212 as second
Test side；The control terminal of second transistor TB can be the base stage of triode, and can be used as second and flow unit 1212
Control terminal.
It should be noted that the second end of the first transistor TA can be used as the first load output for flowing unit 1211
End.The second end of second transistor TB can be used as the second load outputs for flowing unit 1212.Each load outputs can be with
It is separately connected corresponding load, such as the first load LED1 and the second load LED2, are load supplying.Wherein, load can be hair
Optical diode (Light Emitting Diode, LED).
The second end of first resistor RA and the connecting pin of the second end of second resistance RB can be connected to ground, as long as guaranteeing the
The second end of one resistance RA is identical with the current potential of the second end of second resistance RB.
Wherein, due to transistor, such as triode, amplification factor β be affected by temperature larger, therefore first resistor RA and second
Resistance RB can be thermo-compensator.Wherein, transistor may include the first transistor TA and second transistor TB.It is exemplary
Ground, when the β value of second transistor TB increases since temperature raises, the electric current IB for flowing through second transistor TB also be will increase,
Then pressure drop on second resistance RB increases, and the pressure drop of the pole B and the pole E of second transistor TB reduces, thus inhibit electric current IB after
It is continuous to increase, play negative feedback.
Further, as shown in figure 3, control submodule 122 includes: third transistor T1, the 4th transistor T2 and third
Resistance R；
The first end of the control terminal connection 3rd resistor R of third transistor T1 and the first end of the 4th transistor T2, third
The second end of the first end connection 3rd resistor R of transistor T1；
The second end of the control terminal connection third transistor T1 of 4th transistor T2 and the output end of protective module 11, the 4th
The second end of the second end connection first resistor RA of transistor T2.
It is understood that third transistor T1 and the 4th transistor T2 can be triode or field-effect tube, herein simultaneously
The concrete type of third transistor T1 and the 4th transistor T2 are not defined.Illustratively, when third transistor T1 is three
When pole pipe, the control terminal of third transistor T1 can be the base stage of triode, and the first end of third transistor T1 can be three poles
The collector (pole c) of pipe, the second end of third transistor T1 can be the emitter of triode；When the 4th transistor T2 is three poles
The first end of Guan Shi, the 4th transistor T2 can be the collector of triode, and the control terminal of the 4th transistor T2 can be three poles
The base stage of pipe, the second end of the 4th transistor T2 can be the emitter of triode.
In addition, the first end of third transistor T1 can connect the power supply end of current foldback circuit, the 4th transistor
The second end of T2 can be connected to ground.
The working principle of current-sharing module 12 can be with are as follows: according to the characteristic of triode, the electric current of transistor base is identical, specifically
Ground, referring to Fig. 3, the voltage signal of the second end output of third transistor T1 is by the first transistor TA, second transistor TB and the
Branch where four transistor T2 is divided equally, therefore, the base current phase of the first transistor TA, second transistor TB and the 4th transistor T2
Together.Electric current IB and stream available according to Ic=β Ib, flowing through the electric current IA of the first transistor TA, flow through second transistor TB
The electric current IR for crossing resistance R is equal；Wherein, the electric current of R: IR1=(VCC-VbeT1-VbeT2)/R1, in which: VbeT1 and VbeT2
For the pressure drop of the pole B and the pole E of T1 and T2.
Referring to Fig. 3, reference voltage signal V_REF can be the threshold value (tool of reference voltage signal of the triggering of protective module 11
Body numerical value can be set according to the voltage value of first resistor RA or second resistance RB when overcurrent), when normal work, protect mould
Protection location in block 11, i.e. voltage comparator output voltage are height, do not influence circuit normal work.When uneven stream occurs in circuit
Or when the abnormal conditions such as short circuit, electric current IA or electric current IB will appear increase phenomenon, correspondingly, first resistor RA or second resistance RB
On voltage also will increase.When the voltage on first resistor RA or second resistance RB is greater than reference voltage signal V_REF, compare
Device output becomes low level from high level, by the base voltage of the first transistor TA, second transistor TB and the 4th transistor T2
It drags down, the first transistor TA, second transistor TB and the 4th transistor T2 cut-off, to protect circuit.Wherein, overcurrent protection electricity
Third diode D, first diode DA and the second diode DB can be isolating diode in road, play the role of signal isolation.
Further, the first transistor, second transistor, third transistor and the 4th transistor are triode or field-effect
Pipe.
The utility model embodiment additionally provides a kind of equipment, which includes current foldback circuit as described above.
Current foldback circuit provided by the utility model embodiment can be performed in above equipment, has and executes overcurrent protection electricity
The corresponding functional module in road and beneficial effect.
Note that above are only the preferred embodiment and institute's application technology principle of the utility model.Those skilled in the art's meeting
Understand, the utility model is not limited to specific embodiment described here, is able to carry out for a person skilled in the art various bright
Aobvious variation, readjustment and substitution is without departing from the protection scope of the utility model.Therefore, although passing through above embodiments
The utility model is described in further detail, but the utility model is not limited only to above embodiments, is not departing from
It can also include more other equivalent embodiments in the case that the utility model is conceived, and the scope of the utility model is by appended
Scope of the claims determine.
Claims (10)
1. a kind of current foldback circuit characterized by comprising protective module and current-sharing module；
The first input end of the protective module is connect with the first test side of the current-sharing module, and the second of the protective module
Input terminal is connect with the second test side of the current-sharing module, the control of the output end of the protective module and the current-sharing module
End connection；
Wherein, voltage signal of the protective module according to first test side and/or the second test side, Xiang Suoshu control terminal
Output adjustment voltage signal, to control the electric current of the current-sharing module.
2. circuit according to claim 1, which is characterized in that the protective module includes protection location, input isolation list
Member and output isolated location；
The first input end of the input isolated location is connect with the first test side of the current-sharing module, and the input isolation is single
Second input terminal of member is connect with the second test side of the current-sharing module, the output end of the input isolated location and the guarantor
Protect the first input end connection of unit；
The input terminal of the output isolated location is connect with the output end of the protection location, the output of the output isolated location
End is connect with the control terminal of the current-sharing module；
Wherein, voltage signal and the protection location second of the protection location based on the input isolated location output input
The reference voltage signal received is terminated, exports control voltage signal to the output isolated location；
The output isolated location is believed according to the control voltage signal to the control terminal output adjustment voltage of the current-sharing module
Number.
3. circuit according to claim 2, which is characterized in that the input isolated location includes first diode and second
Diode, the output isolated location includes third diode；
The first end of the first diode is connect with the first test side of the current-sharing module, and the second of the first diode
End connects the first end of second diode and the first input end of the protection location；
The second end of second diode is connect with the second test side of the current-sharing module；
The first end of the third diode is connect with the control terminal of the current-sharing module, the second end of the third diode with
The output end of the protection location connects.
4. circuit according to claim 2, which is characterized in that the protection location is voltage comparator.
5. circuit according to claim 1, which is characterized in that the current-sharing module includes: that stream submodule and control is sub
Module；
The control terminal for flowing submodule is connect with the output end of the control submodule, first inspection for flowing submodule
It surveys end to connect with the first input end of the protective module, second test side for flowing submodule and the protective module
The connection of second input terminal；
The control terminal of the control submodule is connect with the output end of the protective module.
6. circuit according to claim 5, which is characterized in that the stream submodule flows unit and second including first
Flow unit；
Described first flow unit control terminal connect described second flow unit control terminal and the control submodule it is defeated
Outlet, the described first test side for flowing unit are connect with the first input end of the protective module；
Described second test side for flowing unit is connect with the second input terminal of the protective module.
7. circuit according to claim 6, which is characterized in that the described first stream unit includes the first transistor and first
Resistance, the described second stream unit includes second transistor and second resistance；
The first end of the first transistor connects the first end of the first resistor and the first input end of the protective module,
The control terminal of the first transistor connects the control terminal of the second transistor and the output end of the control submodule；
The first end of the second transistor connects the first end of the second resistance and the second input terminal of the protective module；
The second end of the first resistor connects the second end of the second resistance.
8. circuit according to claim 7, which is characterized in that the control submodule includes: third transistor, the 4th crystalline substance
Body pipe and 3rd resistor；
The control terminal of the third transistor connects the first end of the 3rd resistor and the first end of the 4th transistor, institute
The first end for stating third transistor connects the second end of the 3rd resistor；
The control terminal of 4th transistor connects the second end of the third transistor and the output end of the protective module, institute
The second end for stating the 4th transistor connects the second end of the first resistor.
9. circuit according to claim 8, which is characterized in that the first transistor, second transistor, third transistor
It is triode or field-effect tube with the 4th transistor.
10. a kind of equipment, which is characterized in that the equipment includes current foldback circuit as described in any one of claim 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920206216.1U CN209265232U (en) | 2019-02-18 | 2019-02-18 | Overcurrent protection circuit and equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN118399604A (en) * | 2024-05-15 | 2024-07-26 | 山东文登抽水蓄能有限公司 | Tripping control method and system for intelligent switch station of pumped storage power station |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118399604A (en) * | 2024-05-15 | 2024-07-26 | 山东文登抽水蓄能有限公司 | Tripping control method and system for intelligent switch station of pumped storage power station |
| CN118399604B (en) * | 2024-05-15 | 2024-10-22 | 山东文登抽水蓄能有限公司 | Tripping control method and system for intelligent switch station of pumped storage power station |
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Effective date of registration: 20200326 Address after: 510530 Guangdong city of Guangzhou province YUNPU Whampoa district four Road No. 6 Patentee after: Guangzhou Shiyuan Electronic Technology Company Limited Address before: 510530, No. four, 6, Po Po Road, Yun Po Industrial Zone, Whampoa District, Guangzhou, Guangdong Co-patentee before: GUANGZHOU RUIXIN ELECTRONICS Co.,Ltd. Patentee before: Guangzhou Shiyuan Electronic Technology Company Limited |