CN106410525B - A kind of interface circuit, electronic equipment and its control method - Google Patents
A kind of interface circuit, electronic equipment and its control method Download PDFInfo
- Publication number
- CN106410525B CN106410525B CN201610947484.XA CN201610947484A CN106410525B CN 106410525 B CN106410525 B CN 106410525B CN 201610947484 A CN201610947484 A CN 201610947484A CN 106410525 B CN106410525 B CN 106410525B
- Authority
- CN
- China
- Prior art keywords
- interface
- pmos tube
- connect
- input voltage
- interface circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/66—Structural association with built-in electrical component
- H01R13/665—Structural association with built-in electrical component with built-in electronic circuit
- H01R13/6666—Structural association with built-in electrical component with built-in electronic circuit with built-in overvoltage protection
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B13/00—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion
- G05B13/02—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B9/00—Safety arrangements
- G05B9/02—Safety arrangements electric
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Health & Medical Sciences (AREA)
- Artificial Intelligence (AREA)
- Computer Vision & Pattern Recognition (AREA)
- Evolutionary Computation (AREA)
- Medical Informatics (AREA)
- Software Systems (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The present invention provides a kind of interface circuit, electronic equipment and its control methods, which includes: interface, for connecting external equipment；And the control unit connecting with the interface controls the interfacing ground if the input voltage for the interface is more than or equal to preset value.The present invention, come control interface ground connection, thus EOS energy of releasing in time, can effectively prevent interface circuit because of the security risks such as circuit devcie damage caused by EOS, improve the security performance of interface circuit according to the input voltage of interface.
Description
Technical field
The present invention relates to the communications field more particularly to a kind of interface circuits, electronic equipment and its control method.
Background technique
Currently, many electronic equipments have the demand of other external external equipments, thus it is furnished with corresponding external interface.Its
When his equipment insertion external interface, external interface may result in due to excessive electrical stress (Electrical Over
Stress, abbreviation EOS) and be damaged, such as Electro-static Driven Comb (Electro-Static discharge, abbreviation ESD), wave
It gushes, direct current etc..When external surge or direct current etc. are more than pressure resistance or the flow-resistant capacity of external interface, external interface electricity can be burnt
The device of road, so that interface function fails, and there are security risks.As it can be seen that the existing anti-EOS ability of external interface circuit
Difference.
Summary of the invention
The embodiment of the invention provides a kind of interface circuit, electronic equipment and its control methods, to solve to prevent interface electric
The device of road due to EOS by damage the technical issues of.
In a first aspect, the embodiment of the invention provides a kind of interface circuits, comprising:
Interface, for connecting external equipment；
And the control unit being connect with the interface, if the input voltage for the interface is more than or equal to preset value,
Then control the interfacing ground.
Second aspect, the embodiment of the present invention also provide a kind of electronic equipment, and the electronic equipment includes weighing above-mentioned interface electricity
Road.
The third aspect, the embodiment of the present invention also provide a kind of control method of interface circuit, and the interface circuit is above-mentioned
Interface circuit, comprising:
Obtain the input voltage of the interface；
If the input voltage of the interface is more than or equal to preset value, the interfacing ground is controlled.
In this way, a kind of interface circuit, electronic equipment and its control method provided in an embodiment of the present invention, the interface circuit packet
It includes: interface, for connecting external equipment；And the control unit being connect with the interface, if the input electricity for the interface
Pressure is more than or equal to preset value, then controls the interfacing ground.The present invention is grounded according to the input voltage of interface come control interface, from
And EOS energy of releasing in time, interface circuit can be effectively prevent to improve because of the security risks such as circuit devcie damage caused by EOS
The security performance of interface circuit.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, needed in being described below to the embodiment of the present invention
Attached drawing to be used is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention,
For those of ordinary skill in the art, without any creative labor, it can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is a kind of interface circuit structure schematic diagram provided in an embodiment of the present invention；
Fig. 2 is another interface circuit structure schematic diagram provided in an embodiment of the present invention；
Fig. 3 is another interface circuit structure schematic diagram provided in an embodiment of the present invention；
Fig. 4 is another interface circuit structure schematic diagram provided in an embodiment of the present invention；
Fig. 5 is another interface circuit structure schematic diagram provided in an embodiment of the present invention；
Fig. 6 is a kind of control method flow chart of interface circuit provided in an embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are some of the embodiments of the present invention, instead of all the embodiments.Based on this hair
Embodiment in bright, every other implementation obtained by those of ordinary skill in the art without making creative efforts
Example, shall fall within the protection scope of the present invention.
In a first aspect, the present invention implements a kind of interface circuit 100 provided referring to Fig. 1, comprising:
Interface 101, for connecting external equipment；
And the control unit 102 being connect with the interface, it is preset if the input voltage for the interface is more than or equal to
Value, then control the interfacing ground.
In the present embodiment, external equipment can be any equipment connected using interface, for example, card reader, flashlight, blood
Sugared instrument or sound equipment etc..
In the embodiment of the present invention, it is grounded according to the input voltage of interface come control interface, thus EOS energy of releasing in time,
Interface circuit can be effectively prevent because of the security risks such as circuit devcie damage caused by EOS, improve the security performance of interface circuit.
As shown in Fig. 2, the present invention implements another interface circuit provided, comprising:
Interface 101, for connecting external equipment；
And control unit 102, described control unit 102 include first end and second end, the first end connects with described
Mouth 101 connects, and the second end ground connection controls described first if the input voltage of the interface 101 is more than or equal to preset value
End is connected with the second end.
As shown in Fig. 2, interface 101 is connect with signal source 103, which provides the processing signal of interface 101 with reality
Existing interface function.The first end of control unit 102 is connected between interface 101 and signal source 103, and the second of control unit 102
End ground connection.If the input voltage of interface 101 certainly will increase severely suddenly at this point, generating EOS, control unit 102 passes through monitoring interface
101 input voltage value can judge whether there is EOS, in time will control if the input voltage of interface 101 is greater than preset value
The first end and second end of unit 102 is connected, and the energy drag ground of EOS is released, positioned at 102 rear of control unit
Circuit devcie then can avoid meeting with the surprise attack of EOS energy and damaging, to cause safety problem.Wherein, preset value according to
EOS difference is accordingly arranged.
Optionally, as shown in figure 3, described control unit 102 includes the first PMOS tube 1021 and the second PMOS tube 1022, institute
The grid for stating the first PMOS tube 1021 connects to power supply, the source electrode of first PMOS tube 1021 and second PMOS tube 1022
Source electrode connection, the drain electrode of first PMOS tube 1021 connect with the interface 101, the grid of second PMOS tube 1022
It is connect with the power supply, the grounded drain of second PMOS tube.
Carrying out docking by two PMOS tube can be realized when the input voltage of interface is in normal range of operation, then and two
A POMS pipe is turned off, and is more than preset normal range (NR) in the input voltage of interface, then to not influence the normal function of interface
Two PMOS tube are both turned on, so that interfacing ground, to discharge overvoltage protection circuit safety.Below to specific work process into
Row explanation.
Interface processing is generally analog signal, and there are positive/negative-pressures, if the input voltage of interface is Vd.Due to body diode
Pressure drop is the definite value determined by PMOS tube itself, if the pressure drop of the body diode of the first PMOS tube 1021 and the second PMOS tube 1022
For v, the source voltage Vs1=Vd-v of the first POMS pipe 1021 can be calculated.It may compare the source electrode of the first PMOS tube 1021 at this time
Voltage Vs1 and grid voltage Vg1, as source voltage Vs1- grid voltage Vg1 >=cut-in voltage M, then the first PMOS tube 1021 is led
Logical, as source voltage Vs1- grid voltage Vg1 < cut-in voltage M, then the first PMOS tube 1021 is ended, wherein Vg1 is by power supply electricity
Pressure provides, and can be exported, can also be exported by mobile terminal processor by fixed power source, specific source and form do not provide.Due to
The source electrode of second PMOS tube 1022 is connect with the source electrode of the first PMOS tube 1021, therefore the source voltage of the second PMOS tube 1022 and
The source voltage of one PMOS tube 1021 is equal, is Vs2=Vs1=Vd-v.The grid voltage of second PMOS tube 1022 is equally by electricity
Source voltage provides, i.e. Vg2=Vg1.Thus, when the conducting of the first PMOS tube 1021, the second PMOS tube 1022 is also necessarily satisfying for leading
Gating condition, when the cut-off of the first PMOS tube 1021, the second PMOS tube 1022 is also at off state.
It should be understood that the first PMOS tube 1021 and the second PMOS tube 1022 can abutting joint independently, can also be right
It connects and is encapsulated in a device to simplify the complexity of device installation.
Optionally, as shown in figure 3, the interface circuit further includes protective resistance 105, described to prevent PMOS tube latch
The grid of first PMOS tube 1021 and the grid of second PMOS tube 1022 respectively by after connecting with protective resistance 105 with institute
State power supply connection.Wherein, the resistance value of the protective resistance 105 is preferably 1K.
Optionally, as shown in figure 4, described control unit includes third if the input voltage of interface only exists positive voltage
The grid of PMOS tube 1023, the third PMOS tube 1023 connects to power supply, the source electrode of the third PMOS tube 1023 with it is described
Interface connection, the grounded drain of the third PMOS tube 1023.If the source voltage of third PMOS tube is Vs3, third PMOS tube
Grid voltage be Vg3, since the input voltage of interface is positive voltage, then source voltage Vs3 > 0 of third PMOS tube.At this time
Three PMOS tube need to only meet source voltage Vs3- grid voltage Vg3 >=cut-in voltage M, can be connected.As it can be seen that preventing interface
Under the EOS situation of positive voltage, a PMOS tube can be realized conducting in time and lead ground for EOS energy.
Optionally, as shown in figure 4, the interface circuit further includes protective resistance 105, described to prevent PMOS tube latch
The grid of third PMOS tube 1023 is connect after connecting with protective resistance 105 with the power supply, wherein the electricity of the protective resistance 105
Resistance value is preferably 1K.
Preferably, in the embodiment of the present invention, the first PMOS tube, the second PMOS tube and third PMOS tube meet predetermined power model
It encloses, wherein predetermined power range setting is generally 1.5w or more, and specific pmos power depends on the load of external equipment
Size.In embodiments of the present invention, since the load of earphone is smaller, the power of the PMOS tube is preferably 2w.Because of relatively high power
PMOS tube conduction impedance it is lower, only tens milliohms, the heat power consumption very little being added on PMOS will not burn out PMOS tube, and
The turn-on time of PMOS tube is less than 5ns, and the waveform rise time of surge is 8ns, and beating PMOS tube in surge can quickly will be unrestrained
It gushes and bleeds off.DC voltage comes, and rapidly draws direct current to ground within the 5ns time, triggers the overcurrent protection of direct current source.
Optionally, as shown in Figure 3 and Figure 4, the interface circuit further includes 104 (Electro-Static of electrostatic impedor
Discharge, abbreviation ESD), one end of the electrostatic impedor 104 is connect with the interface 101, other end ground connection, to right
Interface circuit carries out electrostatic protection.In the present embodiment, electrostatic impedor 104 uses a kind of high-effect protector of diode
Part TVS pipe.It should be understood that other electrostatic impedors in addition to TVS pipe can also be used.
Optionally, as shown in figure 5, the interface 101 includes that left channel interface 1011, right channel interface 1012 and microphone connect
Mouth 1013；
Described control unit includes that the first control subelement 1024, second controls subelement 1025 and third control subelement
1026；
The first control subelement 1024 is connect with the left channel interface 1011, if being used for the left channel interface
1011 input voltage is more than or equal to the first preset value, then controls the left channel interface 1011 and be grounded；
The second control subelement 1025 is connect with the right channel interface 1012, if being used for the right channel interface
1012 input voltage is more than or equal to the second preset value, then controls the right channel interface 1012 and be grounded；
The third control subelement 1026 is connect with the microphone interface 1013, if for the microphone interface 1013
Input voltage is more than or equal to third preset value, then controls the microphone interface 1013 and be grounded.
Interface circuit is illustrated by taking earphone interface as an example in the present embodiment.Earphone interface generally by left channel interface,
Right channel interface and microphone interface composition, since each interface respectively realizes its function respectively, thus need to be respectively configured first
Control subelement, the second control subelement and third control subelement are monitored control to the input voltage of interface respectively, with
Prevent the EOS damage of respective interface.It should be understood that above-mentioned first control subelement, the second control subelement and third control
Subelement can be set as the form docked by the first PMOS tube and the second PMOS tube according to demand, or single by third PMOS tube structure
At form.To prevent PMOS tube latch, when above-mentioned first PMOS tube, the second PMOS tube and third PMOS tube access circuit,
It is connected to power supply again after the protective resistance that can also connect.Certainly, on above-mentioned left channel interface, right channel interface and microphone interface
It can be separately connected electrostatic impedor ESD, to improve antistatic capacity.
A kind of interface circuit provided in an embodiment of the present invention, comprising: interface, for connecting external equipment；And with it is described
The control unit of interface connection controls the interfacing ground if the input voltage for the interface is more than or equal to preset value.
In this way, according to the input voltage of interface come control interface ground connection, so that EOS energy of releasing in time, can effectively prevent interface circuit
Because of the security risks such as circuit devcie damage caused by EOS, the security performance of interface circuit is improved.
Second aspect, the embodiment of the invention provides a kind of electronic equipment, the electronic equipment includes above-mentioned Fig. 1 to Fig. 5
Shown in any plug-in card safety control circuit.
Above-mentioned electronic equipment portion can be any electronic equipment including interface circuit, such as: mobile phone, tablet computer
(Tablet Personal Computer), laptop computer (Laptop Computer), personal digital assistant (personal
Digital assistant, abbreviation PDA), mobile Internet access device (Mobile Internet Device, 20MID) or wearable
Formula equipment (Wearable Device) etc., can also be other electronic equipments, such as digital camera, e-book, navigation product.
It is not that the embodiment of the present invention is explained since the function or structure of other building blocks of electronic equipment are the prior art
The emphasis stated, details are not described herein again.
A kind of electronic equipment provided in an embodiment of the present invention, the electronic equipment include above-mentioned interface circuit.In this way, according to
The input voltage of interface carrys out control interface ground connection, thus EOS energy of releasing in time, can effectively prevent interface circuit because of EOS caused by
Circuit devcie damage etc. security risks, improve the security performance of interface circuit.
The third aspect, the embodiment of the invention provides a kind of control method of interface circuit, the interface circuit is above-mentioned
Interface circuit, referring to Fig. 6, comprising the following steps:
Step 601, the input voltage for obtaining the interface；
If the input voltage of step 602, the interface is more than or equal to preset value, the interfacing ground is controlled.
The control method of above-mentioned interface circuit can be realized by Fig. 1 to any interface circuit shown in fig. 5, specific real
The mode of applying may refer to the embodiment of above-mentioned interface circuit, and details are not described herein again.
A kind of control method of interface circuit provided in an embodiment of the present invention, the interface circuit are above-mentioned interface circuit,
It include: the input voltage for obtaining the interface；If the input voltage of the interface is more than or equal to preset value, the interface is controlled
Ground connection.In this way, according to the input voltage of interface come control interface ground connection, so that EOS energy of releasing in time, can effectively prevent interface
The security risks such as the damage of circuit devcie caused by circuit because EOS, improve the security performance of interface circuit.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all contain
Lid is within protection scope of the present invention.Therefore, protection scope of the present invention should be subject to the protection scope in claims.
Claims (7)
1. a kind of interface circuit characterized by comprising
Interface, for connecting external equipment；
And the control unit connecting with the interface is controlled if the input voltage for the interface is more than or equal to preset value
Make the interfacing ground；
Wherein, the interface is connect with signal source, and the signal source provides the processing signal of the interface to realize interface function,
Described control unit includes first end and second end, and the first end is connected between the interface and the signal source, described
Second end ground connection controls the first end and leads with the second end if the input voltage of the interface is more than or equal to preset value
It is logical；
Described control unit includes the first PMOS tube and the second PMOS tube, and the grid of first PMOS tube connects to power supply, institute
The source electrode for stating the first PMOS tube is connect with the source electrode of second PMOS tube, and the drain electrode of first PMOS tube and the interface connect
It connects, the grid of second PMOS tube is connect with the power supply, the grounded drain of second PMOS tube.
2. interface circuit according to claim 1, which is characterized in that the interface circuit further includes protective resistance, described
The grid of first PMOS tube and the grid of second PMOS tube respectively by after connecting with the protective resistance with the power supply
Connection.
3. interface circuit according to claim 1 to 2, which is characterized in that the interface circuit further includes static impedance
Device, one end of the electrostatic impedor are connect with the interface, other end ground connection.
4. interface circuit according to claim 1, which is characterized in that
The interface includes left channel interface, right channel interface and microphone interface；
Described control unit includes that the first control subelement, the second control subelement and third control subelement,
The first control subelement is connect with the left channel interface, if the input voltage for the left channel interface is greater than
Equal to the first preset value, then the left channel interface ground connection is controlled,
The second control subelement is connect with the right channel interface, if the input voltage for the right channel interface is greater than
Equal to the second preset value, then the right channel interface ground connection is controlled,
The third control subelement is connect with the microphone interface, if the input voltage for the microphone interface is more than or equal to
Third preset value then controls the microphone interface ground connection.
5. a kind of electronic equipment, which is characterized in that the electronic equipment includes the described in any item interface electricity of Claims 1-4
Road.
6. electronic equipment according to claim 5, which is characterized in that the electronic equipment is mobile phone, tablet computer, above-knee
Type computer, personal digital assistant, wearable device, digital camera, e-book or navigator.
7. a kind of control method of interface circuit, the interface circuit is any interface circuit of claim 1-4, feature
It is, comprising:
Obtain the input voltage of the interface；
If the input voltage of the interface is more than or equal to preset value, the interfacing ground is controlled；
Wherein, the interface is connect with signal source, and the signal source provides the processing signal of the interface to realize interface function,
Described control unit includes first end and second end, and the first end is connected between the interface and the signal source, described
Second end ground connection controls the first end and leads with the second end if the input voltage of the interface is more than or equal to preset value
It is logical；Described control unit includes the first PMOS tube and the second PMOS tube, and the grid of first PMOS tube connects to power supply, described
The source electrode of first PMOS tube is connect with the source electrode of second PMOS tube, and the drain electrode of first PMOS tube and the interface connect
It connects, the grid of second PMOS tube is connect with the power supply, the grounded drain of second PMOS tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610947484.XA CN106410525B (en) | 2016-10-26 | 2016-10-26 | A kind of interface circuit, electronic equipment and its control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610947484.XA CN106410525B (en) | 2016-10-26 | 2016-10-26 | A kind of interface circuit, electronic equipment and its control method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106410525A CN106410525A (en) | 2017-02-15 |
| CN106410525B true CN106410525B (en) | 2019-08-20 |
Family
ID=58013847
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610947484.XA Active CN106410525B (en) | 2016-10-26 | 2016-10-26 | A kind of interface circuit, electronic equipment and its control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106410525B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101847859A (en) * | 2009-03-25 | 2010-09-29 | 深圳富泰宏精密工业有限公司 | Interface apparatus and electronic device using same |
| CN202076771U (en) * | 2011-04-29 | 2011-12-14 | 比亚迪股份有限公司 | USB OTG circuit and portable electronic device utilizing thereof |
| CN102480125A (en) * | 2010-11-19 | 2012-05-30 | 英业达股份有限公司 | Current protection circuit for USB (Universal Serial Bus) interface |
| CN105591355A (en) * | 2016-02-24 | 2016-05-18 | 硅谷数模半导体（北京）有限公司 | USB-C control chip, USB-C control chip protection circuit, and USB-C system |
| CN105988543A (en) * | 2015-02-02 | 2016-10-05 | 鸿富锦精密工业(武汉)有限公司 | Control circuit and electronic device using same |
-
2016
- 2016-10-26 CN CN201610947484.XA patent/CN106410525B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101847859A (en) * | 2009-03-25 | 2010-09-29 | 深圳富泰宏精密工业有限公司 | Interface apparatus and electronic device using same |
| CN102480125A (en) * | 2010-11-19 | 2012-05-30 | 英业达股份有限公司 | Current protection circuit for USB (Universal Serial Bus) interface |
| CN202076771U (en) * | 2011-04-29 | 2011-12-14 | 比亚迪股份有限公司 | USB OTG circuit and portable electronic device utilizing thereof |
| CN105988543A (en) * | 2015-02-02 | 2016-10-05 | 鸿富锦精密工业(武汉)有限公司 | Control circuit and electronic device using same |
| CN105591355A (en) * | 2016-02-24 | 2016-05-18 | 硅谷数模半导体（北京）有限公司 | USB-C control chip, USB-C control chip protection circuit, and USB-C system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106410525A (en) | 2017-02-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104331141B (en) | Overcurrent protection circuit and server thereof | |
| CN101562443B (en) | Overvoltage protection circuit and liquid crystal display device drive circuit | |
| CN104505890B (en) | Mobile terminal | |
| CN104269835A (en) | Protection device, electronic equipment and power supply | |
| CN209313152U (en) | For the circuit of USB cable, electronic marker circuit and for the electronic marker circuit of USB connector | |
| WO2016034121A1 (en) | Lightning protection circuit and method for direct-current power supply port of communication device | |
| CN109728631B (en) | Charging circuit and electronic equipment | |
| CN209462021U (en) | A kind of reverse connection preventing over-pressure safety device, earphone and USB charging unit | |
| CN104753048A (en) | POE power supply protection system and POE power supply protection method | |
| CN206332448U (en) | A kind of lightning protection circuit and apply its lightning protection power source | |
| US10756547B2 (en) | Data line used in a mobile phone | |
| CN201629569U (en) | Over-voltage protection circuit of USB interface | |
| CN106463974A (en) | Connector and charging system | |
| CN105591538A (en) | Universal serial bus power transmission device | |
| CN112467705A (en) | Lightning protection device and inverter | |
| CN106410525B (en) | A kind of interface circuit, electronic equipment and its control method | |
| CN105099419B (en) | Power chip with electrostatic discharge protection | |
| CN106406816A (en) | An interface circuit used for firmware upgrade and an intelligent apparatus | |
| CN202616544U (en) | Terminal PC (personal computer) multifunctional lightning protection socket | |
| CN106054681B (en) | A kind of plug-in card safety control circuit, method and mobile terminal | |
| CN108762455A (en) | A kind of chip power-on reset circuit | |
| CN207603205U (en) | A kind of overvoltage, current foldback circuit | |
| CN207782406U (en) | Video multichannel holography surge protector | |
| CN207799010U (en) | It is a kind of realize lightning surge and insulate voltage-withstand test simultaneously by design circuit | |
| CN105739663B (en) | USB power source control circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |