CN107294067A - Guard method, device and the electric automobile of inverter - Google Patents
Guard method, device and the electric automobile of inverter Download PDFInfo
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- CN107294067A CN107294067A CN201610194116.2A CN201610194116A CN107294067A CN 107294067 A CN107294067 A CN 107294067A CN 201610194116 A CN201610194116 A CN 201610194116A CN 107294067 A CN107294067 A CN 107294067A
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- inverter
- switching tube
- overcurrent protection
- threshold value
- current value
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/122—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a kind of guard method of inverter, device and electric automobile, wherein, this method comprises the following steps：Sample the current value of switching tube in inverter, and the current value of switch tube judged；If the current value of switching tube continuously reaches preset times more than the number of times of the first predetermined threshold value, overcurrent protection control is carried out to inverter；If the current value of switching tube is more than the second predetermined threshold value, overcurrent protection control directly is carried out to inverter, wherein, the first predetermined threshold value is less than the second predetermined threshold value.The guard method of inverter according to embodiments of the present invention, it is possible to increase the degree of accuracy to inverter overcurrent protection, not only ensure that the security of circuit, moreover it is possible to improve the stability of invertor operation.
Description
Technical field
The present invention relates to technical field of automotive electronics, more particularly to a kind of guard method of inverter, device and electric automobile.
Background technology
Along with the increasingly depleted of non-renewable energy resources, and pollution problem increasingly serious, the new energy based on electric automobile
Source automobile has obtained more and more extensive utilization.In electric automobile, inverter is core devices, therefore for inverter
Protection is particularly important.
At present, the inverter in electric automobile is protected using the method for general hardware circuit protection in correlation technique.Specifically
For, the i.e. switching tube of positive closing inverter, and force disconnecting circuit master after occurring excessively stream in detecting inverter circuit
Contactor in loop.
The above method can prevent the damage that excessively stream is caused to inverter circuit to a certain extent.However, usually can in circuit
Accidentally occurs of short duration excessively stream pressure phenomenon because of various other factors, this causes during being protected by the above method often
The situation of protection by mistake occurs, i.e., the measures such as the switching tube of positive closing inverter are taken because of the excessively stream accidentally occurred.Cause
This, relatively low for the degree of accuracy of inverter protection in correlation technique, this undoubtedly can cause unnecessary to the normal work of inverter
Influence, so as to reduce the stability of invertor operation.
The content of the invention
It is contemplated that at least solving one of technical problem in above-mentioned technology to a certain extent.Therefore, one of the present invention
Purpose is to propose a kind of guard method of inverter, it is possible to increase the degree of accuracy to inverter overcurrent protection, not only ensure that
The security of circuit, moreover it is possible to improve the stability of invertor operation.
Second object of the present invention is to propose a kind of protection device of inverter.
Third object of the present invention is to propose a kind of electric automobile.
The guard method for the inverter that embodiment is proposed, comprises the following steps according to a first aspect of the present invention：Sample the inversion
The current value of switching tube in device, and the current value of the switching tube is judged；If the current value of the switching tube is continuous
Number of times more than the first predetermined threshold value reaches preset times, then carries out overcurrent protection control to the inverter；If described open
The current value for closing pipe is more than the second predetermined threshold value, then directly carries out overcurrent protection control to the inverter, wherein, described the
One predetermined threshold value is less than second predetermined threshold value.
The guard method of inverter according to embodiments of the present invention, by the current value of switching tube in inverter of sampling, in switch
The current value of pipe continuously reaches preset times more than the number of times of the first predetermined threshold value, or to be more than second pre- for the current value of switching tube
If during threshold value, carrying out overcurrent protection control to inverter, thus, setting the condition of above-mentioned two overcurrent protection, Neng Gouti
The degree of accuracy of high overcurrent protection, can either prevent the excessively stream in inverter from causing to damage to circuit, and protection pair by mistake can be prevented again
The influence of inverter normal work, so not only ensure that the security of circuit, moreover it is possible to improve the stability of invertor operation.
According to a second aspect of the present invention embodiment propose inverter protection device, including：Sampling module, the sampling mould
Current value of the block for switching tube in the inverter of sampling；Judge module, the judge module is used for the switching tube
Current value is judged；Protection module, the protection module is used to continuously preset more than first in the current value of the switching tube
When the number of times of threshold value reaches preset times, overcurrent protection control is carried out to the inverter, and in the current value of the switching tube
During more than the second predetermined threshold value, overcurrent protection control directly is carried out to the inverter, wherein, first predetermined threshold value is small
In second predetermined threshold value.
The protection device of inverter according to embodiments of the present invention, by the current value of switching tube in inverter of sampling, in switch
The current value of pipe continuously reaches preset times more than the number of times of the first predetermined threshold value, or to be more than second pre- for the current value of switching tube
If during threshold value, carrying out overcurrent protection control to inverter, thus, setting the condition of above-mentioned two overcurrent protection, Neng Gouti
The degree of accuracy of high overcurrent protection, can either prevent the excessively stream in inverter from causing to damage to circuit, and protection pair by mistake can be prevented again
The influence of inverter normal work, so not only ensure that the security of circuit, moreover it is possible to improve the stability of invertor operation.
According to a third aspect of the present invention embodiment propose electric automobile, including according to a second aspect of the present invention embodiment propose
The protection device of inverter.
Electric automobile according to embodiments of the present invention, by the current value of switching tube in inverter of sampling, in the electric current of switching tube
Value continuously reaches preset times more than the number of times of the first predetermined threshold value, or the current value of switching tube is when being more than the second predetermined threshold value,
Overcurrent protection control is carried out to inverter, thus, the condition of above-mentioned two overcurrent protection is set, it is possible to increase overcurrent protection
The degree of accuracy, can either prevent excessively stream in inverter from causing to damage to circuit, can prevent that protection is normal to inverter by mistake again
The influence of work, so not only ensure that the security of circuit, moreover it is possible to improve the stability of electric automobile operation.
The additional aspect and advantage of the present invention will be set forth in part in the description, and partly will become bright from the following description
It is aobvious, or recognized by the practice of the present invention.
Brief description of the drawings
Fig. 1 is the flow chart of the guard method of the inverter according to one embodiment of the invention；
Fig. 2 is the block diagram of the protection device of the inverter according to one embodiment of the invention.
Embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein identical from beginning to end
Or similar label represents same or similar element or the element with same or like function.Retouched below with reference to accompanying drawing
The embodiment stated is exemplary, it is intended to for explaining the present invention, and be not considered as limiting the invention.
Below in conjunction with the accompanying drawings come describe the embodiment of the present invention proposition inverter guard method, device and electric automobile.
Fig. 1 is the flow chart of the guard method of the inverter according to one embodiment of the invention.
As shown in figure 1, the guard method of the inverter of the embodiment of the present invention, comprises the following steps：
The current value of switching tube in S101, sampling inverter, and the current value of switch tube judged.
The inverter of the embodiment of the present invention can be the inverter in electric automobile., can be by performing inversion in electric automobile
Control program is controlled to inverter, the direct current of electrokinetic cell is converted to after alternating current, feeds to electric automobile
AC electric appliance, so as to realize the driving and control to electric automobile.Specifically, inverter may include switching tube, by right
The control whether switching tube turns on, can be converted to alternating current by the direct current of input.
In an embodiment of the present invention, can be by performing current sample program come the current value of switching tube in inverter of sampling.
S102, if the current value of switching tube continuously reaches preset times more than the number of times of the first predetermined threshold value, to inverter
Carry out overcurrent protection control.
S103, if the current value of switching tube is more than the second predetermined threshold value, directly carries out overcurrent protection control to inverter,
Wherein, the first predetermined threshold value is less than the second predetermined threshold value.
In one embodiment of the invention, the first predetermined threshold value and the second predetermined threshold value can be according to inverter and related hardware electricity
The overload capacity on road and set.Usually, the current value in switching tube is more than the first predetermined threshold value and is less than the second predetermined threshold value
When, inverter and associated hardware circuitry will not be caused to damage in a short time, and it is pre- more than second in the current value of switching tube
If threshold value, inverter and associated hardware circuitry can be caused in a short time to damage.
It should be appreciated that the current value of switching tube be more than the first predetermined threshold value can be caused by circuit abnormality or by
Caused by the interference signal accidentally occurred in sampling process, in consideration of it, the current value in switching tube is continuously more than the first default threshold
The number of times of value reaches carries out overcurrent protection control after preset times to inverter, can avoid missing caused by the appearance of interference signal
Protection.The current value of switching tube is relatively probably caused by the faults such as short circuit, in such case more than the second predetermined threshold value
Under can directly to inverter carry out overcurrent protection control, to prevent inverter and associated hardware circuitry to be damaged.
In an embodiment of the present invention, it can be exported by closing the drive signal of inverter to carry out overcurrent protection control to inverter
System.From software control in terms of for, can by perform overcurrent protection program come to inverter carry out overcurrent protection control.
In one embodiment of the invention, can be by DSP (Digital Signal Processing, Digital Signal Processing)
Chip performs above-mentioned inversion control program, current sample program and overcurrent protection program.
In dsp chip, overcurrent protection control program can be placed in current sample program by the way of interrupt nesting,
And the interrupt priority level of current sample program is higher than the interrupt priority level for the inversion control program being controlled to inverter.
In one embodiment of the present of invention, the interruption of inversion control program can be produced by cputimer0 functions, the inversion control program
Interrupt with the fixed cycle, thus inverter control program perform can the inverter control program conduct interrupt cycle
Time reference.Specifically, can be by inverter control program portable into for circulations, in the interruption week of inverter control program
In phase, after the completion of the interruption of the current sample program higher than its priority is performed, then inverter control program is performed.Thus,
When needing to carry out overcurrent protection to inverter, the interruption of trigger current sampling routine, if being now in inversion control program
Interrupt cycle, the inversion control program being carrying out can be interrupted, overcurrent protection control program be performed at once, so as to ensure that
The real-time of protection is flowed, relative to for overcurrent protection program is performed after having performed inversion control program, it is possible to increase excessively stream
The speed of protection.
In an embodiment of the present invention, the interrupt cycle of inversion control program is more than the interrupt cycle of current sample program, specifically
Ground, the interrupt cycle of inversion control program can be 80-120us, and the interrupt cycle of current sample program can be 20us.Thus,
The interruption of current sample program can be performed a plurality of times within the interrupt cycle of an inversion control program, so as to ensure that electric current is adopted
The real-time of the down trigger of sample program, further ensures the real-time of overcurrent protection.
The guard method of inverter according to embodiments of the present invention, by the current value of switching tube in inverter of sampling, in switch
The current value of pipe continuously reaches preset times more than the number of times of the first predetermined threshold value, or to be more than second pre- for the current value of switching tube
If during threshold value, carrying out overcurrent protection control to inverter, thus, setting the condition of above-mentioned two overcurrent protection, Neng Gouti
The degree of accuracy of high overcurrent protection, can either prevent the excessively stream in inverter from causing to damage to circuit, and protection pair by mistake can be prevented again
The influence of inverter normal work, so not only ensure that the security of circuit, moreover it is possible to improve the stability of invertor operation.
To realize above-described embodiment, the present invention also proposes a kind of protection device of inverter.
Fig. 2 is the block diagram of the protection device of the inverter according to one embodiment of the invention.
As shown in Fig. 2 the protection device of the inverter of the embodiment of the present invention, including：Sampling module 10, judge module 20
With protection module 30.
Wherein, current value of the sampling module 10 for switching tube in inverter of sampling, judge module 20 is used for switch tube
Current value is judged that protection module 30 reaches pre- for the continuous number of times more than the first predetermined threshold value of current value in switching tube
If during number of times, overcurrent protection control is carried out to inverter, and when the current value of switching tube is more than the second predetermined threshold value, directly
Overcurrent protection control is carried out to inverter, wherein, the first predetermined threshold value is less than the second predetermined threshold value.
The inverter of the embodiment of the present invention can be the inverter in electric automobile., can be by performing inversion in electric automobile
Control program is controlled to inverter, the direct current of electrokinetic cell is converted to after alternating current, feeds to electric automobile
AC electric appliance, so as to realize the driving and control to electric automobile.Specifically, inverter may include switching tube, by right
The control whether switching tube turns on, can be converted to alternating current by the direct current of input.
In one embodiment of the invention, the first predetermined threshold value and the second predetermined threshold value can be according to inverter and related hardware electricity
The overload capacity on road and set.Usually, the current value in switching tube is more than the first predetermined threshold value and is less than the second predetermined threshold value
When, inverter and associated hardware circuitry will not be caused to damage in a short time, and it is pre- more than second in the current value of switching tube
If threshold value, inverter and associated hardware circuitry can be caused in a short time to damage.
It should be appreciated that the current value of switching tube be more than the first predetermined threshold value can be caused by circuit abnormality or by
Caused by the interference signal accidentally occurred in sampling process, in consideration of it, the current value in switching tube is continuously more than the first default threshold
The number of times of value reaches carries out overcurrent protection control after preset times to inverter, can avoid missing caused by the appearance of interference signal
Protection.The current value of switching tube is relatively probably caused by the faults such as short circuit, in such case more than the second predetermined threshold value
Under can directly to inverter carry out overcurrent protection control, to prevent inverter and associated hardware circuitry to be damaged.Specifically,
Protection module 30 can be exported to carry out overcurrent protection control to inverter by closing the drive signal of inverter.
In an embodiment of the present invention, can be by performing current sample program so that sampling mould for software control aspect
The current value of switching tube in the sampling inverter of block 10, and can be by performing overcurrent protection control program so that 30 pairs of protection module
Inverter carries out overcurrent protection control.
In one embodiment of the invention, above-mentioned inversion control program, current sample program can be performed by dsp chip
With overcurrent protection program.
In dsp chip, overcurrent protection control program can be placed in current sample program by the way of interrupt nesting,
And the interrupt priority level of current sample program is higher than the interrupt priority level for the inversion control program being controlled to inverter.
In one embodiment of the present of invention, the interruption of inversion control program can be produced by cputimer0 functions, the inversion control program
Interrupt with the fixed cycle, thus inverter control program perform can the inverter control program conduct interrupt cycle
Time reference.Specifically, can be by inverter control program portable into for circulations, in the interruption week of inverter control program
In phase, after the completion of the interruption of the current sample program higher than its priority is performed, then inverter control program is performed.Thus,
When needing to carry out overcurrent protection to inverter, the interruption of trigger current sampling routine, if being now in inversion control program
Interrupt cycle, the inversion control program being carrying out can be interrupted, overcurrent protection control program be performed at once, so as to ensure that
The real-time of protection is flowed, relative to for overcurrent protection program is performed after having performed inversion control program, it is possible to increase excessively stream
The speed of protection.
In an embodiment of the present invention, the interrupt cycle of inversion control program is more than the interrupt cycle of current sample program, specifically
Ground, the interrupt cycle of inversion control program can be 80-120us, and the interrupt cycle of current sample program can be 20us.Thus,
The interruption of current sample program can be performed a plurality of times within the interrupt cycle of an inversion control program, so as to ensure that electric current is adopted
The real-time of the down trigger of sample program, further ensures the real-time of overcurrent protection.
The protection device of inverter according to embodiments of the present invention, by the current value of switching tube in inverter of sampling, in switch
The current value of pipe continuously reaches preset times more than the number of times of the first predetermined threshold value, or to be more than second pre- for the current value of switching tube
If during threshold value, carrying out overcurrent protection control to inverter, thus, setting the condition of above-mentioned two overcurrent protection, Neng Gouti
The degree of accuracy of high overcurrent protection, can either prevent the excessively stream in inverter from causing to damage to circuit, and protection pair by mistake can be prevented again
The influence of inverter normal work, so not only ensure that the security of circuit, moreover it is possible to improve the stability of invertor operation.
Correspondence above-described embodiment, the present invention also proposes a kind of electric automobile.
The electric automobile of the embodiment of the present invention, includes the protection device of the inverter proposed according to the above embodiment of the present invention, its
Specific embodiment can refer to above-described embodiment, to avoid redundancy, will not be repeated here.
Electric automobile according to embodiments of the present invention, by the current value of switching tube in inverter of sampling, in the electric current of switching tube
Value continuously reaches preset times more than the number of times of the first predetermined threshold value, or the current value of switching tube is when being more than the second predetermined threshold value,
Overcurrent protection control is carried out to inverter, thus, the condition of above-mentioned two overcurrent protection is set, it is possible to increase overcurrent protection
The degree of accuracy, can either prevent excessively stream in inverter from causing to damage to circuit, can prevent that protection is normal to inverter by mistake again
The influence of work, so not only ensure that the security of circuit, moreover it is possible to improve the stability of electric automobile operation.
In the description of the invention, it is to be understood that term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", " on ", " under ", "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom ", " interior ", " outer ",
The orientation or position relationship of the instruction such as " clockwise ", " counterclockwise ", " axial direction ", " radial direction ", " circumference " are based on shown in the drawings
Orientation or position relationship, are for only for ease of the description present invention and simplify description, rather than indicate or imply signified device or
Element must have specific orientation, with specific azimuth configuration and operation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " be only used for describe purpose, and it is not intended that indicate or imply relative importance or
The implicit quantity for indicating indicated technical characteristic.Thus, " first " is defined, the feature of " second " can be expressed or hidden
Include one or more this feature containing ground.In the description of the invention, " multiple " are meant that two or more,
Unless otherwise specifically defined.
In the present invention, unless otherwise clearly defined and limited, the art such as term " installation ", " connected ", " connection ", " fixation "
Language should be interpreted broadly, for example, it may be fixedly connected or be detachably connected, or integrally；Can be machinery
Connection or electrical connection；Can be joined directly together, can also be indirectly connected to by intermediary, can be two members
The interaction relationship of connection or two elements inside part.For the ordinary skill in the art, can be according to tool
Body situation understands the concrete meaning of above-mentioned term in the present invention.
In the present invention, unless otherwise clearly defined and limited, fisrt feature can be "above" or "below" second feature
First and second features are directly contacted, or the first and second features pass through intermediary mediate contact.Moreover, first is special
Levy second feature " on ", " top " and " above " but fisrt feature directly over second feature or oblique upper, or only
Only represent that fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below "
Can be fisrt feature immediately below second feature or obliquely downward, or be merely representative of fisrt feature level height less than second
Feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specific example ",
Or the description of " some examples " etc. means to combine specific features, structure, material or the feature bag that the embodiment or example are described
It is contained at least one embodiment of the present invention or example.In this manual, to the schematic representation of above-mentioned term necessarily
It is directed to identical embodiment or example.Moreover, specific features, structure, material or the feature of description can be any
Combined in an appropriate manner in individual or multiple embodiments or example.In addition, in the case of not conflicting, the skill of this area
Not be the same as Example or the feature of example and non-be the same as Example or example described in this specification can be combined by art personnel
And combination.
Although embodiments of the invention have been shown and described above, it is to be understood that above-described embodiment be it is exemplary,
It is not considered as limiting the invention, one of ordinary skill in the art within the scope of the invention can be to above-described embodiment
It is changed, changes, replacing and modification.
Claims (11)
1. a kind of guard method of inverter, it is characterised in that comprise the following steps：
Sample the current value of switching tube in the inverter, and the current value of the switching tube is judged；
If the current value of the switching tube continuously reaches preset times more than the number of times of the first predetermined threshold value, to the inversion
Device carries out overcurrent protection control；
If the current value of the switching tube is more than the second predetermined threshold value, overcurrent protection control directly is carried out to the inverter,
Wherein, first predetermined threshold value is less than second predetermined threshold value.
2. the guard method of inverter according to claim 1, it is characterised in that will also by the way of interrupt nesting
Overcurrent protection control program is placed in current sample program, and the interrupt priority level of the current sample program is higher than to institute
State the interrupt priority level for the inversion control program that inverter is controlled.
3. the guard method of inverter according to claim 2, it is characterised in that the interruption of the inversion control program
Cycle is more than the interrupt cycle of the current sample program.
4. the guard method of inverter according to claim 3, it is characterised in that the interruption of the inversion control program
Cycle is 80-120us, and the interrupt cycle of the current sample program is 20us.
5. the guard method of the inverter according to any one of claim 1-4, it is characterised in that described by closing
The drive signal of inverter exports to carry out overcurrent protection control to the inverter.
6. a kind of protection device of inverter, it is characterised in that including：
Sampling module, current value of the sampling module for switching tube in the inverter of sampling；
Judge module, the judge module is used to judge the current value of the switching tube；
Protection module, the protection module is used to reach in the number of times that the current value of the switching tube is continuously more than the first predetermined threshold value
During to preset times, overcurrent protection control is carried out to the inverter, and preset more than second in the current value of the switching tube
During threshold value, overcurrent protection control directly is carried out to the inverter, wherein, it is pre- that first predetermined threshold value is less than described second
If threshold value.
7. the protection device of inverter according to claim 6, it is characterised in that by perform current sample program with
Make the current value of switching tube in the sampling module sampling inverter, by performing overcurrent protection control program so that described
Protection module carries out overcurrent protection control to the inverter, wherein, overcurrent protection is controlled into journey by the way of interrupt nesting
Sequence is placed in current sample program, and the current sample program interrupt priority level higher than being controlled to the inverter
The interrupt priority level of the inversion control program of system.
8. the protection device of inverter according to claim 7, it is characterised in that the interruption of the inversion control program
Cycle is more than the interrupt cycle of the current sample program.
9. the protection device of inverter according to claim 8, it is characterised in that the interruption of the inversion control program
Cycle is 80-120us, and the interrupt cycle of the current sample program is 20us.
10. the protection device of the inverter according to any one of claim 6-9, it is characterised in that the protection mould
Block is exported to carry out overcurrent protection control to the inverter by closing the drive signal of the inverter.
11. a kind of electric automobile, it is characterised in that include the guarantor of the inverter according to any one of claim 6-10
Protection unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610194116.2A CN107294067A (en) | 2016-03-30 | 2016-03-30 | Guard method, device and the electric automobile of inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610194116.2A CN107294067A (en) | 2016-03-30 | 2016-03-30 | Guard method, device and the electric automobile of inverter |
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| Publication Number | Publication Date |
|---|---|
| CN107294067A true CN107294067A (en) | 2017-10-24 |
Family
ID=60087899
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610194116.2A Pending CN107294067A (en) | 2016-03-30 | 2016-03-30 | Guard method, device and the electric automobile of inverter |
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| Country | Link |
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| CN (1) | CN107294067A (en) |
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| CN112310938A (en) * | 2019-07-31 | 2021-02-02 | 华为技术有限公司 | Local side equipment, power supply system, electric shock protection method and device |
| CN114498548A (en) * | 2022-01-21 | 2022-05-13 | 合肥科威尔电源系统股份有限公司 | Overcurrent protection method and device |
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| CN114498548A (en) * | 2022-01-21 | 2022-05-13 | 合肥科威尔电源系统股份有限公司 | Overcurrent protection method and device |
| CN114498548B (en) * | 2022-01-21 | 2023-10-31 | 科威尔技术股份有限公司 | Overcurrent protection method and device |
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Application publication date: 20171024 |