CN107689652A - A kind of charge protection method, circuit, device and mobile terminal - Google Patents
A kind of charge protection method, circuit, device and mobile terminal Download PDFInfo
- Publication number
- CN107689652A CN107689652A CN201710708977.2A CN201710708977A CN107689652A CN 107689652 A CN107689652 A CN 107689652A CN 201710708977 A CN201710708977 A CN 201710708977A CN 107689652 A CN107689652 A CN 107689652A
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- Prior art keywords
- charging inlet
- stitch
- mobile terminal
- gnd
- temperature
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0036—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using connection detecting circuits
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The embodiments of the invention provide a kind of charge protection method, circuit, device and mobile terminal.The mobile terminal includes charging inlet, and methods described includes：Whether the temperature for detecting the charging inlet is more than default temperature protection threshold value；If so, then stop carrying out cooling processing to the charging inlet input current, and to the charging inlet.The embodiment of the present invention solves the problem of when vacantly being handled the metal-back of USB socket and GND, VBUS is directly connected to GND, causes short circuit, burns stitch.
Description
Technical field
The present invention relates to technical field of mobile terminals, more particularly to a kind of charge protection method, circuit, device and movement
Terminal.
Background technology
USB (Universal Serial Bus USBs) is the agreement of a standard, in initial standard,
USB joint has 4 stitch：VBUS (power supply), D-, D+, GND (ground wire), 4 stitch in joint are provided entirely in one piece of solid modeling
On tablet, this block plastic sheet and 4 stitch are exactly tongue piece altogether, and USB tongue pieces are fixed in the metal-back of a cuboid,
The width of tongue piece as the width of metal-back, be on the one hand to protect USB tongue pieces, be on the other hand for convenience and plug
Connection, still, so occurs a kind of situation, that is, VBUS, GND stitch on USB tongue pieces can touch metal-back, cause
VBUS contacts with metal-back, is connected indirectly with GND, so as to cause short circuit, high current occurs, heating is serious, finally burns stitch.
At present, existing design is vacantly to be handled the metal-back of USB socket with GND, that is, the width of tongue piece
Be shorter than the width of metal-back, so solve VBUS by metal-back indirectly with GND short circuit situation.But due to USB socket
It is not totally enclosed, so during routine use, conductive debris can be entered, VBUS stitch and GND stitch is connected
Connect, cause VBUS to be directly connected to GND, cause short circuit, burn stitch.
The content of the invention
The embodiment of the present invention proposes a kind of charge protection method, circuit, device and mobile terminal, to solve above-mentioned VBUS
It is directly connected to GND, causes short circuit, the problem of burning stitch.
In order to solve the above problems, the embodiment of the invention discloses a kind of charge protection method, applied to mobile terminal, institute
Stating mobile terminal includes charging inlet, and described method includes：
Whether the temperature for detecting the charging inlet is more than default temperature protection threshold value；
If so, then stop carrying out cooling processing to the charging inlet input current, and to the charging inlet.
Accordingly, the embodiment of the invention also discloses a kind of charge protector, applied to mobile terminal, including charging
Mouthful, in addition to：
Whether detection module, the temperature for detecting the charging inlet are more than default temperature protection threshold value；
Protection module, for if so, then stopping dropping to the charging inlet input current, and to the charging inlet
Temperature processing.
Further, the embodiment of the invention also discloses a kind of charge protection protection device, including charging described above
Protection circuit.
Further, the embodiment of the invention also discloses a kind of mobile terminal, including charge protector described above.
In embodiments of the present invention, when the mobile terminal is in charge, whether the temperature that can detect the charging inlet is more than
Default temperature protection threshold value, if so, then stopping cooling to the charging inlet input current, and to the charging inlet
Processing.So, both solved VBUS to contact with metal-back, be connected indirectly with GND, and so as to cause short circuit, finally burnt stitch
Problem, also solves that when vacantly being handled the metal-back of USB socket and GND, VBUS is directly connected to GND, causes short circuit,
The problem of burning stitch.
Brief description of the drawings
Fig. 1 is the step flow chart of charge protection method provided in an embodiment of the present invention；
Fig. 2 is the connection diagram of cooling module provided in an embodiment of the present invention；
Fig. 3 is the structured flowchart of charge protector provided in an embodiment of the present invention.
Embodiment
In order to facilitate the understanding of the purposes, features and advantages of the present invention, it is below in conjunction with the accompanying drawings and specific real
Applying mode, the present invention is further detailed explanation.
Reference picture 1, the step of showing charge protection method provided in an embodiment of the present invention applied to mobile terminal, flow
Cheng Tu, the mobile terminal include charging inlet；
Mobile terminal is mobile communication terminal, refers to the computer equipment that can be used on the move, and its mobility is main
Mobile communication ability and portability volume are embodied in, such as：Smart mobile phone, tablet personal computer etc., the embodiment of the present invention is not made to this
Limitation.
In a kind of preferred embodiment of the present invention, the charging inlet includes USB tongue pieces, and the USB tongue pieces include VBUS
Stitch and GND stitch.
USB (Universal Serial Bus USBs) is the agreement of a standard, thus to cable, insert
Head, socket etc. have strict code requirement.In initial standard, USB joint has 4 stitch：VBUS (power supply), D-, D+,
GND (ground wire), for the time being such USB joint for being called standard, wherein, 4 stitch in joint are provided entirely in one piece admittedly
On plastic sheet, this block plastic sheet and 4 stitch are exactly tongue piece altogether.Later OTG occurs, and adds miniUSB joints again.
And miniUSB joints then have 5 lines, more ID stitch, for identity.Standard USB port only has A types and Type B.
Each of which type is divided into plug and socket, such as A type plugs, A type sockets etc. again.That socket on usual computer is called A
Type USB socket, and corresponding plug, are called that on A type plugs, such as USB flash disk.And as that socket above printer, then it is B
Type socket (more cubic, do not have that above computer flat), corresponding plug, is exactly Type B plug.Perhaps one was met in practice
The flat USB extended lines in head side one, quite right, that flat head is just called A type plugs, and that head of side, is just called Type B plug,
And accordingly by that slotting two sockets, it is just A types socket and B type socket respectively.A type plugs are to insert not enter B type socket,
Vice versa.
MiniUSB is also classified into A types, Type B, but adds an AB type.Since it is called miniUSB, then certainly it just
It is very little, mainly to portable set, such as MP3, mobile phone, digital camera etc..USB is one master and multiple slaves structure,
I.e. a moment can only have a main frame.As PC is exactly a main frame, others can only be equipment, thus between two equipment
Can not directly it be communicated.And USB OTG (on the go) appearance, then solve this contradiction：One equipment can be with
Under certain occasion, change of status, occur in the form of main frame.Thus there have been the miniUSB sockets of AB types, either A
Type miniUSB plugs, or Type B miniUSB plugs, can insert, and that ID line having more inside identifies it
Identity：It is main frame or slave.Two such USB device can is directly connected to, and is carried out data and is transferred.As MP3
That upper miniUSB socket, be exactly Type B miniUSB sockets (pay attention to, have a kind of miniUSB sockets, it appears that be not USB
Inside specification, because miniUSB joints should have 5 lines, and this socket only has 4 lines).
Because USB is to support hot plug, therefore it also has corresponding measure in the design of joint.The ground of USB plug
Stitch and power supply stitch are long, and two data pins are then shorter, so when being inserted into socket, connect VBUS first
And GND, two data pins are then connected again.So ensure that power supply is connected before data wire, prevents breech lock.
As for USB cable, the pair cable line with shielding is needed to use under Full-Speed mode, and low-speed mode pattern then may be used
With without using shielding and multiple twin.In addition, usb protocol provides, USB speed cable length must not exceed 3 meters, and full speed cable length
It must not exceed 5 meters.Because cable transmission has delay, it is ensured that can correctly respond, cannot postpone too many.USB standard
The color of the inside signal wire is defined, wherein Vbus is red, and D- is white, and D+ is green, and GND is black.
As a rule, either USB socket or miniUSB sockets, are all that USB tongue pieces are fixed on into a cuboid
In metal-back, the width of tongue piece as the width of metal-back, be on the one hand to protect USB tongue pieces, be on the other hand in order to
It is convenient to be connected with plug, still, a kind of situation so occurs, that is, VBUS, GND stitch on USB tongue pieces can touch
Metal-back, cause VBUS to be contacted with metal-back, be connected indirectly with GND, so as to cause short circuit, high current occur, heating is serious, most
Stitch is burnt eventually.
Some designs are vacantly handled the metal-back of USB socket with GND, that is, the width of tongue piece is shorter than metal-back
Width, so solve VBUS by metal-back indirectly with GND short circuit situation.But because USB socket is not totally-enclosed
, so during routine use, conductive debris can be entered, VBUS stitch is connected with GND stitch, causes VBUS
With GND short circuits, stitch is burnt.
Described method specifically may include steps of：
Step 101, whether the temperature for detecting the charging inlet is more than default temperature protection threshold value；
Because as VBUS and GND short circuits, it may appear that high current, heating is serious, so in this application, can detect charging
Whether the temperature of interface is more than default temperature protection threshold value.Because USB stitch is metal material, charging inlet is carried out
Temperature detection is exactly that the temperature of stitch is detected in fact.
But in actual applications, it there is also the situation of a kind of " micro-short circuit ".So-called micro-short circuit, that is, VBUS with
Be not directly connected to cause short circuit between GND, but during charging, electric current input is unstable, electric current can be less than or
More than electric current when charging normal, during electric current when electric current, which is more than, to be charged normal, the abnormal situation of heating just occurs,
Caloric value when exactly than charging normal is big, but again smaller than caloric value caused by short circuit, so, when long-time charges, temperature
Degree can gradually rise, higher than the temperature charged normal, but again than it is short-circuit when temperature it is low；Or occur that electricity can not be inputted once in a while
The situation of stream.
So in this application, mobile terminal can set temperature detecting module, be connected with charging inlet, be filled for detecting
The temperature of electrical interface.For example, temperature when charging normal is 35 DEG C~45 DEG C, therefore default temperature protection threshold value can be set
For 50 DEG C.
It should be noted that can be to the temperature detection of charging inlet real-time monitoring or according to it is default when
Between be spaced, such as every 3S, or 5S just carries out temperature detection, and the mode that the application carries out temperature detection is not restricted.
Step 102, if so, then stopping carrying out at cooling to the charging inlet input current, and to the charging inlet
Reason.
When mobile terminal detects that the temperature of charging inlet is higher than default temperature protection threshold value, then stop to charging
Mouth input current, and cooling processing is carried out to charging inlet.
For example, when the temperature for detecting charging inlet is more than 55 DEG C, represent that charging is abnormal, it is possible to occur and burn pin
The possibility of pin, therefore, stop to charging inlet input current, and cooling processing is carried out to charging inlet.
It should be noted that two kinds of short circuit, micro-short circuit situations occur in actual applications, so going out meeting pair in detection
Answer two methods.
In a kind of preferred embodiment of the present invention, the stopping includes to the step of charging inlet input current：
Connecting the VBUS stitch and the GND stitch so that the VBUS stitch and the GND stitch form short circuit,
Make charge current interruption.
Specifically, the charger end being connected with mobile terminal has overcurrent protection module, if VBUS and GND short circuits, meeting
There is high current, serious situation of generating heat, so, if the overcurrent protection module at charger end has detected high current, meeting
Stop input current, so as to prevent charging inlet to be burned out.
When there is micro-short circuit, the temperature of stitch may not change too much, but overall in a short time, temperature
Degree is in the trend being gradually increasing.So when the temperature for detecting charging inlet is higher than default temperature protection threshold value, now
Electric current can be higher than electric current when charging normal, but electric current when being not above short circuit again.Now, if continuing to charge, charging
The temperature of interface can also slowly rise within a certain period of time, but be unlikely to burn stitch.
To avoid, because constant temperature rise causes finally to burn stitch, presetting when the temperature for detecting charging inlet is higher than
Temperature protection threshold value when, connect VBUS stitch and GND stitch, so, VBUS and GND just form short circuit, now can also produce
High current, when the overcurrent protection module at charger end has detected high current, then it can stop input current, so as to prevent charging
Interface is burned out.
In a kind of preferred embodiment of the present invention, the mobile terminal includes cooling module；It is described to the charging inlet
The step of carrying out cooling processing includes：
Establish the connection of the charging inlet and the cooling module so that the cooling module enters to the charging inlet
Row Physical temperature-lowering.
In embodiments of the present invention, heat sink can be metal fin.When mobile terminal detects charging inlet
When temperature is higher than default temperature protection threshold value, charging inlet and metal fin can be attached, so, charging inlet
Temperature can pass to metal fin, so as to more than cooling purpose.
Fig. 2 shows the connection diagram of cooling module, and charging inlet passes through an electronic switch, such as high power MOS
Switching tube, it is connected to GND radiatings.Charging inlet is placed around temperature detection, such as NTC resistance, believes control after detecting high temperature
Number MOS switch pipe is sent to, that realizes MOS switch pipe is conducting to large stretch of radiating ground.
In a kind of preferred embodiment of the present invention, described method also includes：
If the temperature of the charging inlet after cooling is more than the default temperature protection threshold value, charging is sent
Mouth abnormality warnings.
When stopping to mobile terminal input current, mobile terminal can not just charge, and still, to user for, use
Family only knows that mobile terminal does not fill electricity, but does not know the concrete reason for not filling electricity, so, mobile terminal can pass through
The modes such as sound, word notify user, allow user to understand the concrete reason that mobile terminal can not charge.
It should be noted that for embodiment of the method, in order to be briefly described, therefore it is all expressed as to a series of action group
Close, but those skilled in the art should know, the embodiment of the present invention is not limited by described sequence of movement, because according to
According to the embodiment of the present invention, some steps can use other orders or carry out simultaneously.Secondly, those skilled in the art also should
Know, embodiment described in this description belongs to preferred embodiment, and the involved action not necessarily present invention is implemented
Necessary to example.
Reference picture 3, show the structural frames of the charge protector provided in an embodiment of the present invention applied to mobile terminal
Figure, the mobile terminal include charging inlet, in addition to following module：
Whether detection module 301, the temperature for detecting the charging inlet are more than default temperature protection threshold value；
Protection module 302, for when the temperature of the charging inlet is more than default temperature protection threshold value, stopping to institute
Charging inlet input current is stated, and cooling processing is carried out to the charging inlet.
In a kind of preferred embodiment of the present invention, the charging inlet includes USB tongue pieces, and the USB tongue pieces include VBUS
Stitch and GND stitch；
The protection module includes：
Submodule is connected, for connecting the VBUS stitch and the GND stitch so that the VBUS stitch and described
GND stitch forms short circuit, makes charge current interruption.
In a kind of preferred embodiment of the present invention, the mobile terminal has cooling module；The protection module also includes：
Cool submodule, for establishing the connection of the charging inlet and the cooling module so that the cooling module
Physical temperature-lowering is carried out to the charging inlet.
In a kind of preferred embodiment of the present invention, the circuit also includes：
Alert module, the temperature for the charging inlet after cooling are more than the default temperature protection threshold value
When, send charging inlet abnormality warnings.
It should be noted that charger road maintenance provided in an embodiment of the present invention and the embodiment pair of above-mentioned charge protection method
Should, its operation principle and mode are corresponding applicable, just repeat no more here.
Preferably, the embodiment of the invention discloses a kind of charge protection protection device, including above-mentioned charge protector.
Preferably, the embodiment of the invention discloses a kind of mobile terminal, including above-mentioned charge protector.
In embodiments of the present invention, when the mobile terminal is in charge, whether the temperature that can detect the charging inlet reaches
More than default temperature protection threshold value, if so, then stopping to the charging inlet input current, and the charging inlet is carried out
Cooling is handled.So, both solved VBUS to contact with metal-back, be connected indirectly with GND, and so as to cause short circuit, finally burnt pin
The problem of pin, also solve that when vacantly being handled the metal-back of USB socket and GND, VBUS is directly connected to GND, is caused
Short circuit, the problem of burning stitch.Each embodiment in this specification is described by the way of progressive, each embodiment emphasis
What is illustrated is all the difference with other embodiment, between each embodiment identical similar part mutually referring to.
It should be understood by those skilled in the art that, the embodiment of the embodiment of the present invention can be provided as method, apparatus or calculate
Machine program product.Therefore, the embodiment of the present invention can use complete hardware embodiment, complete software embodiment or combine software and
The form of the embodiment of hardware aspect.Moreover, the embodiment of the present invention can use one or more wherein include computer can
With in the computer-usable storage medium (including but is not limited to magnetic disk storage, CD-ROM, optical memory etc.) of program code
The form of the computer program product of implementation.
The embodiment of the present invention is with reference to method according to embodiments of the present invention, terminal device (system) and computer program
The flow chart and/or block diagram of product describes.It should be understood that can be by computer program instructions implementation process figure and/or block diagram
In each flow and/or square frame and the flow in flow chart and/or block diagram and/or the combination of square frame.These can be provided
Computer program instructions are set to all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing terminals
Standby processor is to produce a machine so that is held by the processor of computer or other programmable data processing terminal equipments
Capable instruction is produced for realizing in one flow of flow chart or multiple flows and/or one square frame of block diagram or multiple square frames
The device for the function of specifying.
These computer program instructions, which may be alternatively stored in, can guide computer or other programmable data processing terminal equipments
In the computer-readable memory to work in a specific way so that the instruction being stored in the computer-readable memory produces bag
The manufacture of command device is included, the command device is realized in one flow of flow chart or multiple flows and/or one side of block diagram
The function of being specified in frame or multiple square frames.
These computer program instructions can be also loaded into computer or other programmable data processing terminal equipments so that
Series of operation steps is performed on computer or other programmable terminal equipments to produce computer implemented processing, so that
The instruction performed on computer or other programmable terminal equipments is provided for realizing in one flow of flow chart or multiple flows
And/or specified in one square frame of block diagram or multiple square frames function the step of.
Although having been described for the preferred embodiment of the embodiment of the present invention, those skilled in the art once know base
This creative concept, then other change and modification can be made to these embodiments.So appended claims are intended to be construed to
Including preferred embodiment and fall into having altered and changing for range of embodiment of the invention.
Finally, it is to be noted that, herein, such as first and second or the like relational terms be used merely to by
One entity or operation make a distinction with another entity or operation, and not necessarily require or imply these entities or operation
Between any this actual relation or order be present.Moreover, term " comprising ", "comprising" or its any other variant meaning
Covering including for nonexcludability, so that process, method, article or terminal device including a series of elements are not only wrapped
Those key elements, but also the other element including being not expressly set out are included, or is also included for this process, method, article
Or the key element that terminal device is intrinsic.In the absence of more restrictions, wanted by what sentence "including a ..." limited
Element, it is not excluded that other identical element in the process including the key element, method, article or terminal device also be present.
Claims (10)
1. a kind of charge protection method, applied to mobile terminal, it is characterised in that the mobile terminal includes charging inlet；Institute
The method stated includes：
Whether the temperature for detecting the charging inlet is more than default temperature protection threshold value；
If so, then stop carrying out cooling processing to the charging inlet input current, and to the charging inlet.
2. according to the method for claim 1, it is characterised in that the charging inlet includes USB tongue pieces, the USB tongue pieces
Including VBUS stitch and GND stitch；
The stopping includes to the step of charging inlet input current：
Connect the VBUS stitch and the GND stitch so that the VBUS stitch and the GND stitch form short circuit, make to fill
Electric current interruptions.
3. method according to claim 1 or 2, it is characterised in that the mobile terminal includes cooling module；
Described the step of cooling processing is carried out to the charging inlet, includes：
Establish the connection of the charging inlet and the cooling module so that the cooling module carries out thing to the charging inlet
Reason cooling.
4. according to the method for claim 1, it is characterised in that described method also includes：
If the temperature of the charging inlet after cooling is more than the default temperature protection threshold value, the charging is sent
Mouth abnormality warnings.
A kind of 5. charge protector, applied to mobile terminal, it is characterised in that including charging inlet, in addition to：
Whether detection module, the temperature for detecting the charging inlet are more than default temperature protection threshold value；
Protection module, for if so, then stopping carrying out at cooling to the charging inlet input current, and to the charging inlet
Reason.
6. circuit according to claim 5, it is characterised in that the charging inlet includes USB tongue pieces, the USB tongue pieces
Including VBUS stitch and GND stitch；
The protection module includes：
Submodule is connected, for connecting the VBUS stitch and the GND stitch so that the VBUS stitch and the GND pins
Pin forms short circuit, makes charge current interruption.
7. the circuit according to claim 5 or 6, it is characterised in that the mobile terminal includes cooling module；The protection
Module also includes：
Cool submodule, for establishing the connection of the charging inlet and the cooling module so that the heat sink is to institute
State charging inlet and carry out Physical temperature-lowering.
8. circuit according to claim 5, it is characterised in that described device also includes：
Alert module, when the temperature for the charging inlet after cooling is more than the default temperature protection threshold value, hair
Go out charging inlet abnormality warnings.
9. a kind of charge protection protection device, it is characterised in that including the charge protection electricity as described in claim any one of 5-8
Road.
10. a kind of mobile terminal, it is characterised in that including the charge protector as described in claim any one of 5-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710708977.2A CN107689652A (en) | 2017-08-17 | 2017-08-17 | A kind of charge protection method, circuit, device and mobile terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710708977.2A CN107689652A (en) | 2017-08-17 | 2017-08-17 | A kind of charge protection method, circuit, device and mobile terminal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107689652A true CN107689652A (en) | 2018-02-13 |
Family
ID=61153411
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710708977.2A Pending CN107689652A (en) | 2017-08-17 | 2017-08-17 | A kind of charge protection method, circuit, device and mobile terminal |
Country Status (1)
| Country | Link |
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| CN (1) | CN107689652A (en) |
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| CN109256830A (en) * | 2018-09-25 | 2019-01-22 | 青岛海尔科技有限公司 | A kind of charging method for excessive heating protection and device |
| CN109980460A (en) * | 2019-02-22 | 2019-07-05 | 维沃移动通信有限公司 | A kind of USB interface protection circuit and guard method, mobile terminal |
| CN110247368A (en) * | 2018-03-09 | 2019-09-17 | 陈晓萍 | Protect circuit |
| CN111614138A (en) * | 2020-05-25 | 2020-09-01 | 维沃移动通信有限公司 | Interface protection circuit and electronic equipment |
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| CN111614138B (en) * | 2020-05-25 | 2022-02-25 | 维沃移动通信有限公司 | Interface protection circuit and electronic equipment |
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Application publication date: 20180213 |