CN109599830A - A kind of voltage overshoot protective device and mobile terminal - Google Patents
A kind of voltage overshoot protective device and mobile terminal Download PDFInfo
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- CN109599830A CN109599830A CN201811551064.5A CN201811551064A CN109599830A CN 109599830 A CN109599830 A CN 109599830A CN 201811551064 A CN201811551064 A CN 201811551064A CN 109599830 A CN109599830 A CN 109599830A
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- current
- limiting protection
- voltage
- switch unit
- unit
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
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- 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
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Abstract
The present invention discloses a kind of voltage overshoot protective device and mobile terminal, belongs to field of mobile terminals.It include: comparing unit, switch unit, in which: the comparing unit makes the switching means conductive connected to it or cut-off according to the surge voltage output level for receiving the charging interface；The switch unit carries out on or off according to the level of the comparing unit output received, enables the current-limiting protection chip on or off.Through the embodiment of the present invention, reliable pulse suppression function may be implemented, Synchronous lifting Surge suppression ability protects current-limiting protection chip to damage from excessive surge voltage.Also, protective device is constituted by comparing unit and switch unit, design is simple, at low cost, high reliablity, promotes user experience.
Description
Technical field
The present invention relates to field of mobile terminals, in particular to a kind of voltage overshoot protective device and mobile terminal.
Background technique
Currently, mobile terminal becomes increasingly popular, more and more using the user of mobile terminal, and user routine use is mobile
Terminal is also more and more frequent, so that mobile terminal has become one of essential mobile device of user.
Currently, needing to charge mobile terminal connection charger after the electricity of mobile terminal is finished.In movement
When terminal charge, inside mobile terminal, current-limiting protection chip generally can be all set behind mobile terminal charging interface,
It is damaged to avoid the excessive mainboard to mobile terminal of charging current.
The charging interface of mobile terminal is generally mechanical DOCK, will appear voltage using this mechanical DOCK contact
Impact phenomenon.And the size of the voltage impacted is indefinite, the size for generating voltage is related with charger, socket, alternating current situation.
And surge voltage will cause impact to the current-limiting protection chip, general current-limiting protection chip is low pressure-resistant voltage, although current limliting
Protection chip is for being more than that the surge voltage of its pressure-resistant voltage has certain tolerance, but tolerance time is limited, length
Impact lasting long damages the current-limiting protection chip service life, and with the increase of number of shocks, the increasing of working time of collision
Add, surge voltage peak value must increase, and will cause current-limiting protection wafer damage.
Summary of the invention
In view of this, a kind of voltage overshoot protective device provided in an embodiment of the present invention and mobile terminal, may be implemented
Reliable pulse suppression function, Synchronous lifting Surge suppression ability protect current-limiting protection chip to make from excessive surge voltage
At damage.Also, protective device is constituted by comparing unit and switch unit, design is simple, at low cost, high reliablity, is promoted
User experience.
It is as follows that the present invention solves technical solution used by above-mentioned technical problem:
According to an aspect of an embodiment of the present invention, a kind of voltage overshoot protective device provided is applied to mobile whole
End, comprising: comparing unit, switch unit, in which:
The comparing unit is connect with the switch unit and charging interface respectively, for according to the reception charging
The surge voltage output level of mouth, makes the switching means conductive connected to it or cut-off；
The switch unit is connect with the comparing unit and current-limiting protection chip respectively, for according to the institute received
The level for stating comparing unit output carries out on or off, enables the current-limiting protection chip on or off.
In a possible design, the comparing unit, for defeated according to the surge voltage for receiving the charging interface
Level out makes the switching means conductive connected to it or cut-off；Include:
Low level is exported when receiving the surge voltage of charging interface less than predeterminated voltage, makes switching means conductive；
High level is exported when receiving the surge voltage of charging interface greater than predeterminated voltage, ends switch unit.
In a possible design, the predeterminated voltage is set according to the pressure-resistant voltage of current-limiting protection chip, no
It can exceed that the pressure-resistant voltage of current-limiting protection chip.
In a possible design, the switch unit, for the electricity according to the comparing unit output received
It is flat to carry out on or off, enable the current-limiting protection chip on or off；Include:
The low level of the comparing unit output is received, switching means conductive enables the current limliting connected to it and protects
Protect chip conducting；
The high level of the comparing unit output is received, switch unit cut-off enables the current limliting connected to it and protects
Protect chip cut-off.
In a possible design, described device further include: the filter unit is connect with the switch unit, is used
It is filtered in the output to the switch unit, stablizes the output smoothing of the switch unit.
Other side according to an embodiment of the present invention, a kind of mobile terminal provided, comprising: charging interface, voltage mistake
Rush protective device, current-limiting protection chip, the voltage overshoot protective device respectively with the charging interface, the current-limiting protection
Chip connection, in which:
The voltage overshoot protective device, for protecting the current-limiting protection chip from the excessive of the charging interface
Surge voltage and damage.
In a possible design, the voltage overshoot protective device is applied to mobile terminal, which is characterized in that packet
It includes: comparing unit, switch unit, in which:
The comparing unit is connect with the switch unit and charging interface respectively, for according to the reception charging
The surge voltage output level of mouth, makes the switching means conductive connected to it or cut-off；
The switch unit is connect with the comparing unit and current-limiting protection chip respectively, for according to the institute received
The level for stating comparing unit output carries out on or off, enables the current-limiting protection chip on or off.
In a possible design, the comparing unit, for defeated according to the surge voltage for receiving the charging interface
Level out makes the switching means conductive connected to it or cut-off；Include:
Low level is exported when receiving the surge voltage of charging interface less than predeterminated voltage, makes switching means conductive；
High level is exported when receiving the surge voltage of charging interface greater than predeterminated voltage, ends switch unit.
In a possible design, the switch unit, for the electricity according to the comparing unit output received
It is flat to carry out on or off, enable the current-limiting protection chip on or off；Include:
The low level of the comparing unit output is received, switching means conductive enables the current limliting connected to it and protects
Protect chip conducting；
The high level of the comparing unit output is received, switch unit cut-off enables the current limliting connected to it and protects
Protect chip cut-off.
In a possible design, the voltage overshoot protective device further include: the filter unit is opened with described
Unit connection is closed, is filtered for the output to the switch unit, the output smoothing of the switch unit is stablized.
Compared with the relevant technologies, a kind of voltage overshoot protective device provided in an embodiment of the present invention and mobile terminal, packet
Comparing unit is included according to the surge voltage output level for receiving the charging interface, leads the switch unit connected to it
Logical or cut-off；The switch unit carries out on or off according to the level of the comparing unit output received, enables institute
State current-limiting protection chip on or off.In this manner it is achieved that reliable pulse suppression function, Synchronous lifting Surge suppression ability,
Current-limiting protection chip is protected to damage from excessive surge voltage.Also, by comparing unit (comparator) and switch
Unit (transistor circuit) constitutes protective device, and design is simple, at low cost, high reliablity, promotes user experience.
Detailed description of the invention
A kind of hardware structural diagram of Fig. 1 mobile terminal of each embodiment to realize the present invention；
Fig. 2 is a kind of communications network system architecture diagram provided in an embodiment of the present invention；
Fig. 3 is a kind of structural schematic diagram of voltage overshoot protective device provided in an embodiment of the present invention；
Fig. 4 is a kind of structural schematic diagram of mobile terminal provided in an embodiment of the present invention；
Fig. 5 is a kind of structural schematic diagram of mobile terminal provided in an embodiment of the present invention；
Fig. 6 is a kind of structural schematic diagram of voltage overshoot protective device provided in an embodiment of the present invention；
Fig. 7 is a kind of structural schematic diagram of mobile terminal provided in an embodiment of the present invention.
The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.
Specific embodiment
In order to be clearer and more clear technical problems, technical solutions and advantages to be solved, below
In conjunction with the accompanying drawings and embodiments, the present invention will be described in further detail.It should be appreciated that specific embodiment described herein
Only to explain the present invention, it is not intended to limit the present invention.
In subsequent description, it is only using the suffix for indicating such as " module ", " component " or " unit " of element
Be conducive to explanation of the invention, itself there is no a specific meaning.Therefore, " module ", " component " or " unit " can mix
Ground uses.
It should be noted that description and claims of the invention are received and the term " first " in above-mentioned attached drawing, " the
Two " etc. be to be used to distinguish similar objects, without being used to describe a particular order or precedence order.
Terminal can be implemented in a variety of manners.For example, terminal described in the present invention may include such as mobile phone, put down
It is plate computer, laptop, palm PC, personal digital assistant (Personal Digital Assistant, PDA), convenient
Formula media player (Portable Media Player, PMP), navigation device, wearable device, Intelligent bracelet, pedometer
The fixed terminals such as equal mobile terminals, and number TV, desktop computer.
It will be illustrated by taking mobile terminal as an example in subsequent descriptions, it will be appreciated by those skilled in the art that in addition to special
Except element for moving purpose, the construction of embodiment according to the present invention can also apply to the terminal of fixed type.
Referring to Fig. 1, a kind of hardware structural diagram of its mobile terminal of each embodiment to realize the present invention, it should
Mobile terminal 100 may include: RF (Radio Frequency, radio frequency) unit 101, WiFi module 102, audio output unit
103, A/V (audio/video) input unit 104, sensor 105, display unit 106, user input unit 107, interface unit
108, the components such as memory 109, processor 110 and power supply 111.It will be understood by those skilled in the art that shown in Fig. 1
Mobile terminal structure does not constitute the restriction to mobile terminal, and mobile terminal may include components more more or fewer than diagram,
Perhaps certain components or different component layouts are combined.
It is specifically introduced below with reference to all parts of the Fig. 1 to mobile terminal:
Radio frequency unit 101 can be used for receiving and sending messages or communication process in, signal sends and receivees, specifically, by base station
Downlink information receive after, to processor 110 handle；In addition, the data of uplink are sent to base station.In general, radio frequency unit
101 include but is not limited to antenna, at least one amplifier, transceiver, coupler, low-noise amplifier, duplexer etc..This
Outside, radio frequency unit 101 can also be communicated with network and other equipment by wireless communication.Above-mentioned wireless communication, which can be used, appoints
One communication standard or agreement, including but not limited to GSM (Global System of Mobile communication, the whole world
Mobile communcations system), GPRS (General Packet Radio Service, general packet radio service), CDMA2000
(Code Division Multiple Access 2000, CDMA 2000), WCDMA (Wideband Code
Division Multiple Access, wideband code division multiple access), TD-SCDMA (Time Division-Synchronous
Code Division Multiple Access, TD SDMA), FDD-LTE (Frequency Division
Duplexing-Long Term Evolution, frequency division duplex long term evolution) and TDD-LTE (Time Division
Duplexing-Long Term Evolution, time division duplex long term evolution) etc..
WiFi belongs to short range wireless transmission technology, and mobile terminal can help user to receive and dispatch electricity by WiFi module 102
Sub- mail, browsing webpage and access streaming video etc., it provides wireless broadband internet access for user.Although Fig. 1 shows
Go out WiFi module 102, but it is understood that, and it is not belonging to must be configured into for mobile terminal, it completely can be according to need
It to omit within the scope of not changing the essence of the invention.
Audio output unit 103 can be in call signal reception pattern, call mode, record mould in mobile terminal 100
When under the isotypes such as formula, speech recognition mode, broadcast reception mode, by radio frequency unit 101 or WiFi module 102 it is received or
The audio data that person stores in memory 109 is converted into audio signal and exports to be sound.Moreover, audio output unit
103 can also provide audio output relevant to the specific function that mobile terminal 100 executes (for example, call signal reception sound
Sound, message sink sound etc.).Audio output unit 103 may include loudspeaker, buzzer etc..
A/V input unit 104 is for receiving audio or video signal.A/V input unit 104 may include graphics process
Device (Graphics Processing Unit, GPU) 1041 and microphone 1042, graphics processor 1041 are captured in video
In mode or image capture mode by image capture apparatus (such as camera) obtain static images or video image data into
Row processing.Treated, and picture frame may be displayed on display unit 106.Through treated the picture frame of graphics processor 1041
It can store in memory 109 (or other storage mediums) or sent out via radio frequency unit 101 or WiFi module 102
It send.Microphone 1042 can be in telephone calling model, logging mode, speech recognition mode etc. operational mode via Mike
Wind 1042 receives sound (audio data), and can be audio data by such acoustic processing.Treated audio (language
Sound) data can be converted in the case where telephone calling model to be sent to mobile communication base station via radio frequency unit 101
Format output.Microphone 1042 can be implemented various types of noises elimination (or inhibition) algorithms and connect with eliminating (or inhibition)
The noise generated during receipts and transmission audio signal or interference.
Mobile terminal 100 further includes at least one sensor 105, such as optical sensor, motion sensor and other biographies
Sensor.Specifically, optical sensor includes ambient light sensor and proximity sensor, wherein ambient light sensor can be according to environment
The light and shade of light adjusts the brightness of display panel 1061, and proximity sensor can close when mobile terminal 100 is moved in one's ear
Close display panel 1061 and/or backlight.As a kind of motion sensor, accelerometer sensor can detect (one in all directions
As be three axis) acceleration size, can detect that size and the direction of gravity when static, can be used to identify answering for mobile phone posture
It (for example pedometer, is struck with (such as horizontal/vertical screen switching, dependent game, magnetometer pose calibrating), Vibration identification correlation function
Hit) etc.；The fingerprint sensor that can also configure as mobile phone, pressure sensor, iris sensor, molecule sensor, gyroscope,
The other sensors such as barometer, hygrometer, thermometer, infrared sensor, details are not described herein.
Display unit 106 is for showing information input by user or being supplied to the information of user.Display unit 106 can
Including display panel 1061, liquid crystal display (Liquid Crystal Display, LCD), organic light-emitting diodes can be used
Forms such as (Organic Light-Emitting Diode, OLED) are managed to configure display panel 1061.
User input unit 107 can be used for receiving the number or character information of input, and generate the use with mobile terminal
Family setting and the related key signals input of function control.Specifically, user input unit 107 may include touch panel 1071
And other input equipments 1072.Touch panel 1071, also referred to as touch screen collect the touch of user on it or nearby
Operation (for example user uses any suitable objects or attachment such as finger, stylus on touch panel 1071 or in touch panel
Operation near 1071), and corresponding attachment device is driven according to preset formula.Touch panel 1071 may include touching
Touch two parts of detection device and touch controller.Wherein, the touch orientation of touch detecting apparatus detection user, and detect touching
Operation bring signal is touched, touch controller is transmitted a signal to；Touch controller receives touch letter from touch detecting apparatus
Breath, and is converted into contact coordinate, then give processor 110, and can receive order that processor 110 is sent and be held
Row.Furthermore, it is possible to realize touch panel 1071 using multiple types such as resistance-type, condenser type, infrared ray and surface acoustic waves.
In addition to touch panel 1071, user input unit 107 can also include other input equipments 1072.Specifically, other inputs are set
Standby 1072 can include but is not limited to physical keyboard, function key (such as volume control button, switch key etc.), trace ball,
One of mouse, operating stick etc. are a variety of, specifically herein without limitation.
Further, touch panel 1071 can cover display panel 1061, when touch panel 1071 detect on it or
After neighbouring touch operation, processor 110 is sent to determine the type of touch event, is followed by subsequent processing device 110 according to touch thing
The type of part provides corresponding visual output on display panel 1061.Although in Fig. 1, touch panel 1071 and display surface
Plate 1061 is the function that outputs and inputs of realizing mobile terminal as two independent components, but in certain embodiments,
Touch panel 1071 and display panel 1061 can be integrated and be realized the function that outputs and inputs of mobile terminal, specifically herein
Without limitation.
Interface unit 108 be used as at least one external device (ED) connect with mobile terminal 100 can by interface.For example,
External device (ED) may include wired or wireless headphone port, external power supply (or battery charger) port, wired or nothing
Line data port, memory card port, the port for connecting the device with identification module, audio input/output (I/O) end
Mouth, video i/o port, ear port etc..Interface unit 108 can be used for receiving from external device (ED) input (for example,
Data information, electric power etc.) and by the input received be transferred to one or more elements in mobile terminal 100 or
It can be used for transmitting data between mobile terminal 100 and external device (ED).
Memory 109 can be used for storing software program and various data.Memory 109 can mainly include storage program
Area and storage data area, wherein storing program area can application program needed for storage program area, at least one function (such as
Sound-playing function, image player function etc.) etc.；Storage data area, which can be stored, uses created data (ratio according to mobile phone
Such as audio data, phone directory) etc..In addition, memory 109 may include high-speed random access memory, it can also include non-
Volatile memory, for example, at least a disk memory, flush memory device or other volatile solid-state parts.
Processor 110 is the control centre of mobile terminal, utilizes each of various interfaces and the entire mobile terminal of connection
A part by running or execute the software program and/or module that are stored in memory 109, and calls and is stored in storage
Data in device 109 execute the various functions and processing data of mobile terminal, to carry out integral monitoring to mobile terminal.Place
Managing device 110 may include one or more processing units；Preferably, processor 110 can integrate application processor and modulatedemodulate is mediated
Manage device, wherein the main processing operation system of application processor, user interface and application program etc., modem processor is main
Processing wireless communication.It is understood that above-mentioned modem processor can not also be integrated into processor 110.
Mobile terminal 100 can also include the power supply 111 (such as battery) powered to all parts, it is preferred that power supply
111 can be logically contiguous by power-supply management system and processor 110, thus charged by power-supply management system realization management,
The functions such as electric discharge and power managed.
Although Fig. 1 is not shown, mobile terminal 100 can also be including bluetooth module etc., and details are not described herein.
Embodiment to facilitate the understanding of the present invention, the communications network system that mobile terminal of the invention is based below
It is described.
Referring to Fig. 2, Fig. 2 is a kind of communications network system architecture diagram provided in an embodiment of the present invention, the communication network system
System be universal mobile communications technology LTE system, the LTE system include successively communication connection UE (User Equipment,
User equipment) 201, E-UTRAN (Evolved UMTS Terrestrial Radio Access Network, evolved UMTS
Land radio access web) 202, EPC (Evolved Packet Core, evolved packet-based core networks) 203 and operator IP industry
Business 204.
Specifically, UE201 can be above-mentioned terminal 100, and details are not described herein again.
E-UTRAN202 includes eNodeB2021 and other eNodeB2022 etc..Wherein, eNodeB2021 can be by returning
Journey (backhaul) (such as X2 interface) is connect with other eNodeB2022, and eNodeB2021 is connected to EPC203,
ENodeB2021 can provide the access of UE201 to EPC203.
EPC203 may include MME (Mobility Management Entity, mobility management entity) 2031, HSS
(Home Subscriber Server, home subscriber server) 2032, other MME2033, SGW (Serving Gate
Way, gateway) 2034, PGW (PDN Gate Way, grouped data network gateway) 2035 and PCRF (Policy and
Charging Rules Function, policy and rate functional entity) 2036 etc..Wherein, MME2031 be processing UE201 and
The control node of signaling, provides carrying and connection management between EPC203.HSS2032 is for providing some registers to manage
Such as function of home location register (not shown) etc, and preserve some related service features, data rate
The equal dedicated information of users.All customer data can be sent by SGW2034, and PGW2035 can provide UE 201
IP address distribution and other functions, PCRF2036 is the strategy and charging control plan of business data flow and IP bearing resource
Slightly decision point, it selects and provides available strategy and charging control with charge execution function unit (not shown) for strategy
Decision.
IP operation 204 may include internet, Intranet, IMS (IP Multimedia Subsystem, IP multimedia
Subsystem) or other IP operations etc..
Although above-mentioned be described by taking LTE system as an example, those skilled in the art should know the present invention is not only
It is only applicable to LTE system, is readily applicable to other wireless communication systems, such as GSM, CDMA2000, WCDMA, TD-SCDMA
And the following new network system etc., herein without limitation.
Based on above-mentioned mobile terminal hardware configuration and communications network system, each embodiment of the method for the present invention is proposed.
Please refer to Fig. 3.The embodiment of the invention provides a kind of voltage overshoot protective devices 20, are applied to mobile terminal, packet
It includes: comparing unit 21, switch unit 22, in which:
The comparing unit 21 is connect, for filling according to reception respectively with the switch unit 22 and charging interface
The surge voltage output level of electrical interface makes 22 on or off of the switch unit connected to it；
The switch unit 22 is connect with the comparing unit 21 and current-limiting protection chip respectively, is received for basis
The comparing unit 21 export level carry out on or off, enable the current-limiting protection chip on or off.
Further, the comparing unit 21, for according to the surge voltage output level for receiving the charging interface,
Make 22 on or off of the switch unit connected to it；Include:
When receiving the surge voltage of charging interface less than predeterminated voltage, low level is exported, switch unit 22 is connected；
When receiving the surge voltage of charging interface greater than predeterminated voltage, high level is exported, ends switch unit 22.
Wherein, the predeterminated voltage is set according to the pressure-resistant voltage of current-limiting protection chip, no more than current-limiting protection
The pressure-resistant voltage of chip, the purpose is to protect current-limiting protection chip to damage from excessive surge voltage.For example, institute
The pressure-resistant voltage for stating current-limiting protection chip is 7 volts, then the predeterminated voltage is set as 7 volts.When rushing for the charging interface received
When hitting voltage more than predeterminated voltage, the comparing unit output high level can be triggered.
Preferably, the comparing unit 21 is connect with the VBUS output end of charging interface.
Preferably, the comparing unit 21 includes comparator.
Further, the switch unit 22, the level for being exported according to the comparing unit 21 received carry out
On or off enables the current-limiting protection chip on or off；Include:
The low level that the comparing unit 21 exports is received, switch unit 22 is connected, and enables the limit connected to it
Stream protection chip conducting；The high level that the comparing unit 21 exports is received, switch unit 22 ends, enabled to be connected thereto
The current-limiting protection chip cut-off.
Preferably, the switch unit 21 includes the switching circuit that p-type metal-oxide-semiconductor Q1 and N-type metal-oxide-semiconductor Q2 is formed.
Further, described device 20 further include: the filter unit 23 is connect with the switch unit 22, for pair
The output of the switch unit 22 is filtered, and stablizes the output smoothing of the switch unit 22.
Preferably, the filter unit 23 includes at least one filter unit.
The embodiment of the invention provides a kind of voltage overshoot protective devices, are applied to mobile terminal, including comparing unit root
According to the surge voltage output level for receiving the charging interface, make the switching means conductive connected to it or cut-off；It is described
Switch unit carries out on or off according to the level of the comparing unit output received, enables the current-limiting protection core
Piece on or off.In this manner it is achieved that reliable pulse suppression function, Synchronous lifting Surge suppression ability protect current-limiting protection
Chip is damaged from excessive surge voltage.Also, by comparing unit (comparator) and switch unit (triode
Circuit) protective device is constituted, design is simple, at low cost, high reliablity, promotes user experience.
Please refer to Fig. 4 and Fig. 5.The embodiment of the invention provides a kind of mobile terminals 300, comprising: charging interface 10, electricity
Press through and rush protective device 20, current-limiting protection chip 30, the voltage overshoot protective device 20 respectively with the charging interface 10,
The current-limiting protection chip 30 connects, in which:
The voltage overshoot protective device 20, for protecting the current-limiting protection chip 30 from the charging interface 10
Excessive surge voltage and damage；It include: comparing unit 21, switch unit 22, in which:
The comparing unit 21 is connect, for filling according to reception respectively with the switch unit 22 and charging interface
The surge voltage output level of electrical interface makes 22 on or off of the switch unit connected to it；
The switch unit 22 is connect with the comparing unit 21 and current-limiting protection chip respectively, is received for basis
The comparing unit 21 export level carry out on or off, enable the current-limiting protection chip on or off.
Further, the comparing unit 21, for according to the surge voltage output level for receiving the charging interface,
Make 22 on or off of the switch unit connected to it；Include:
When receiving the surge voltage of charging interface less than predeterminated voltage, low level is exported, switch unit 22 is connected；
When receiving the surge voltage of charging interface greater than predeterminated voltage, high level is exported, ends switch unit 22.
Wherein, the predeterminated voltage is set according to the pressure-resistant voltage of current-limiting protection chip, no more than current-limiting protection
The pressure-resistant voltage of chip, the purpose is to protect current-limiting protection chip to damage from excessive surge voltage.For example, institute
The pressure-resistant voltage for stating current-limiting protection chip is 7 volts, then the predeterminated voltage is set as 7 volts.When rushing for the charging interface received
When hitting voltage more than predeterminated voltage, the comparing unit output high level can be triggered.
Preferably, the comparing unit 21 is connect with the VBUS output end of charging interface.
Preferably, the comparing unit 21 includes comparator.
Further, the switch unit 22, the level for being exported according to the comparing unit 21 received carry out
On or off enables the current-limiting protection chip on or off；Include:
The low level that the comparing unit 21 exports is received, switch unit 22 is connected, and enables the limit connected to it
Stream protection chip conducting；The high level that the comparing unit 21 exports is received, switch unit 22 ends, enabled to be connected thereto
The current-limiting protection chip cut-off.
Preferably, the switch unit 21 includes the switching circuit that p-type metal-oxide-semiconductor Q1 and N-type metal-oxide-semiconductor Q2 is formed.
Further, described device 20 further include: the filter unit 23 is connect with the switch unit 22, for pair
The output of the switch unit 22 is filtered, and stablizes the output smoothing of the switch unit 22.
Preferably, the filter unit 23 includes at least one filter unit.
The embodiment of the present invention provides a kind of mobile terminal, including voltage overshoot protective device, the voltage overshoot protection dress
It sets including comparing unit according to the surge voltage output level for receiving the charging interface, keeps the switch connected to it single
First on or off；The switch unit carries out on or off according to the level of the comparing unit output received, makes
It can the current-limiting protection chip on or off.In this manner it is achieved that reliable pulse suppression function, Synchronous lifting Surge suppression
Ability protects current-limiting protection chip to damage from excessive surge voltage.Also, by comparing unit (comparator)
Protective device is constituted with switch unit (transistor circuit), design is simple, at low cost, high reliablity, promotes user experience.
Technical solution of the present invention is described in further detail with reference to embodiments.
Embodiment 1:
Please refer to Fig. 6.
In the present embodiment, the comparing unit 21 by taking comparator as an example, switch unit 22 is with p-type MOS pipe Q1 and N-type
Metal-oxide-semiconductor Q2 composition switching circuit for, filter unit 23 be illustrated by taking filter capacitor as an example, but it should be recognized that this hair
Bright technical solution is not limited to above-mentioned element or module, such as: switching circuit is not limited to p-type metal-oxide-semiconductor, can also
To include N-type metal-oxide-semiconductor, NPN type triode, PNP type triode etc..
A kind of voltage overshoot protective device 20 is applied to mobile terminal, comprising: comparator 21, switching circuit 22, filtering
Capacitor 23, in which:
The comparator 21 is connect with the switching circuit 22 and charging interface respectively, for according to the reception charging
The surge voltage output level of interface makes 22 on or off of the switching circuit connected to it；Include:
When receiving the surge voltage of charging interface less than predeterminated voltage, low level is exported, switching circuit 22 is connected；
When receiving the surge voltage of charging interface greater than predeterminated voltage, high level is exported, ends switching circuit 22.
Wherein, the predeterminated voltage is set according to the pressure-resistant voltage of current-limiting protection chip, no more than current-limiting protection
The pressure-resistant voltage of chip, the purpose is to protect current-limiting protection chip to damage from excessive surge voltage.For example, institute
The pressure-resistant voltage for stating current-limiting protection chip is 7 volts, then the predeterminated voltage is set as 7 volts.When rushing for the charging interface received
When hitting voltage more than predeterminated voltage, the comparing unit output high level can be triggered.
Preferably, the comparator 21 is connect with the VBUS output end of charging interface.
The switching circuit 22 is connect with the comparator 21 and current-limiting protection chip respectively, is received for basis
The level that the comparator 21 exports carries out on or off, enables the current-limiting protection chip on or off；Include:
The low level that the comparator 21 exports is received, switching circuit 22 is connected, and enables the current limliting connected to it
Protect chip conducting；The high level that the comparator 21 exports is received, switching circuit 22 ends, and enables institute connected to it
State the cut-off of current-limiting protection chip.
The filter capacitor 23 is connect with the switching circuit 22, is filtered for the output to the switching circuit 22
Wave stablizes the output smoothing of the switching circuit 22.
The embodiment of the invention provides a kind of voltage overshoot protective device, be applied to mobile terminal, including comparator according to
The surge voltage output level for receiving the charging interface makes the switching means conductive connected to it or cut-off；It is described to open
Powered-down road carries out on or off according to the level of the comparator output received, enables the current-limiting protection chip and leads
Logical or cut-off.In this manner it is achieved that reliable pulse suppression function, Synchronous lifting Surge suppression ability protect current-limiting protection chip
It is damaged from excessive surge voltage.Also, protective device is constituted by comparator and switching circuit, design is simple,
At low cost, high reliablity promotes user experience.
Please refer to Fig. 7.
In the present embodiment, the comparing unit 21 by taking comparator as an example, switch unit 22 is with p-type MOS pipe Q1 and N-type
Metal-oxide-semiconductor Q2 form switching circuit for, filter unit 23 by taking filter capacitor as an example, charging interface 10 is by taking TYPE-C interface as an example
It is illustrated, but it should be recognized that technical solution of the present invention is not limited to above-mentioned element or module, such as:
Switching circuit is not limited to p-type metal-oxide-semiconductor, also may include N-type metal-oxide-semiconductor, NPN type triode, PNP type triode etc..
A kind of mobile terminal 300, comprising: charging interface 10, voltage overshoot protective device 20, current-limiting protection chip 30, institute
Voltage overshoot protective device 20 is stated to connect with the charging interface 10, the current-limiting protection chip 30 respectively, in which:
The voltage overshoot protective device 20, for protecting the current-limiting protection chip 30 from the charging interface 10
Excessive surge voltage and damage；It include: comparator 21, switching circuit 22, filter capacitor 23, in which:
The comparator 21 is connect with the switching circuit 22 and charging interface respectively, for according to the reception charging
The surge voltage output level of interface makes 22 on or off of the switching circuit connected to it；Include:
When receiving the surge voltage of charging interface less than predeterminated voltage, low level is exported, switching circuit 22 is connected；
When receiving the surge voltage of charging interface greater than predeterminated voltage, high level is exported, ends switching circuit 22.
Wherein, the predeterminated voltage is set according to the pressure-resistant voltage of current-limiting protection chip, no more than current-limiting protection
The pressure-resistant voltage of chip, the purpose is to protect current-limiting protection chip to damage from excessive surge voltage.For example, institute
The pressure-resistant voltage for stating current-limiting protection chip is 7 volts, then the predeterminated voltage is set as 7 volts.When rushing for the charging interface received
When hitting voltage more than predeterminated voltage, the comparing unit output high level can be triggered.
Further, the comparator 21 is connect with the VBUS output end of charging interface.
The switching circuit 22 is connect with the comparator 21 and current-limiting protection chip respectively, is received for basis
The level that the comparator 21 exports carries out on or off, enables the current-limiting protection chip on or off；It include: p-type
Metal-oxide-semiconductor Q1 and N-type metal-oxide-semiconductor Q2 composition.Wherein, the grid G of p-type metal-oxide-semiconductor Q1 is connect with the drain D of N-type metal-oxide-semiconductor Q2, p-type MOS
The source S of pipe Q1 and the VBUS output end of charging interface connect, and the drain D and current-limiting protection chip 30 of p-type metal-oxide-semiconductor Q1 connects
It connects.The grid G of N-type metal-oxide-semiconductor Q2 is connect with the output end of comparator 21, the source S ground connection of N-type metal-oxide-semiconductor Q2.
The grid G of N-type metal-oxide-semiconductor Q2 receives the low level that the comparator 21 exports, N-type MOS pipe Q2 cut-off, p-type
Metal-oxide-semiconductor Q1 conducting, the enabled current-limiting protection chip 30 conducting that connection is connected with p-type metal-oxide-semiconductor Q1；
The grid G of N-type metal-oxide-semiconductor Q2 receives the high level that the comparator 21 exports, N-type MOS pipe Q2 conducting, p-type
Metal-oxide-semiconductor Q1 cut-off, the enabled current-limiting protection chip cut-off connecting with p-type metal-oxide-semiconductor Q1, disconnects the VBUS of charging interface 10
The voltage input defencive function of the current-limiting protection chip of rear class is realized in the connection of output end.
The filter capacitor 23 is connect with the switching circuit 22, is filtered for the output to the switching circuit 22
Wave stablizes the output smoothing of the switching circuit 22.
The embodiment of the present invention provides a kind of mobile terminal, including voltage overshoot protective device, the voltage overshoot protection dress
It sets including comparator according to the surge voltage output level for receiving the charging interface, makes the switching circuit connected to it
On or off；The switching circuit carries out on or off according to the level of the comparator output received, enables institute
State current-limiting protection chip on or off.In this manner it is achieved that reliable pulse suppression function, Synchronous lifting Surge suppression ability,
Current-limiting protection chip is protected to damage from excessive surge voltage.Also, it is made up of and protects comparator and switching circuit
Protection unit, design is simple, at low cost, high reliablity, promotes user experience.
It should be noted that, in this document, the terms "include", "comprise" or its any other variant be intended to it is non-
It is exclusive to include, so that the process, method, article or the device that include a series of elements not only include those elements,
It but also including other elements that are not explicitly listed, or further include for this process, method, article or device institute
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, method, article or device including the element.
The serial number of the above embodiments of the invention is only for description, does not represent the advantages or disadvantages of the embodiments.
Through the above description of the embodiments, those skilled in the art can be understood that above-described embodiment
Method can be realized by means of software and necessary general hardware platform, naturally it is also possible to by hardware, but many situations
It is lower the former be more preferably embodiment.Based on this understanding, technical solution of the present invention is substantially in other words to the prior art
The part to contribute can be embodied in the form of software products, which is stored in a storage and is situated between
In matter (such as ROM/RAM, magnetic disk, CD), including some instructions are used so that a terminal (can be mobile phone, computer, clothes
Business device, air conditioner or the network equipment etc.) execute method described in each embodiment of the present invention.
The embodiment of the present invention is described with above attached drawing, but the invention is not limited to above-mentioned tools
Body embodiment, the above mentioned embodiment is only schematical, rather than restrictive, the ordinary skill of this field
Personnel under the inspiration of the present invention, without breaking away from the scope protected by the purposes and claims of the present invention, can also make
Many forms, all of these belong to the protection of the present invention.
Claims (10)
1. a kind of voltage overshoot protective device is applied to mobile terminal characterized by comprising comparing unit, switch unit,
Wherein:
The comparing unit is connect with the switch unit and charging interface respectively, for according to the reception charging interface
Surge voltage output level makes the switching means conductive connected to it or cut-off；
The switch unit is connect with the comparing unit and current-limiting protection chip respectively, for according to the ratio received
Level compared with unit output carries out on or off, enables the current-limiting protection chip on or off.
2. the apparatus according to claim 1, which is characterized in that the comparing unit, for according to the reception charging
The surge voltage output level of mouth, makes the switching means conductive connected to it or cut-off；Include:
Low level is exported when receiving the surge voltage of charging interface less than predeterminated voltage, makes switching means conductive；
High level is exported when receiving the surge voltage of charging interface greater than predeterminated voltage, ends switch unit.
3. the apparatus of claim 2, which is characterized in that the predeterminated voltage is the pressure resistance according to current-limiting protection chip
Voltage is set, no more than the pressure-resistant voltage of current-limiting protection chip.
4. the apparatus of claim 2, which is characterized in that the switch unit, for according to the ratio received
Level compared with unit output carries out on or off, enables the current-limiting protection chip on or off；Include:
The low level of the comparing unit output is received, switching means conductive enables the current-limiting protection core connected to it
Piece conducting；
The high level of the comparing unit output is received, switch unit cut-off enables the current-limiting protection core connected to it
Piece cut-off.
5. the apparatus according to claim 1, which is characterized in that described device further include: the filter unit is opened with described
Unit connection is closed, is filtered for the output to the switch unit, the output smoothing of the switch unit is stablized.
6. a kind of mobile terminal characterized by comprising charging interface, voltage overshoot protective device, current-limiting protection chip, institute
Voltage overshoot protective device is stated to connect with the charging interface, the current-limiting protection chip respectively, in which:
The voltage overshoot protective device, for protecting the current-limiting protection chip to cross large impact electricity from the charging interface
It presses and damages.
7. mobile terminal according to claim 6, which is characterized in that the voltage overshoot protective device is applied to movement
Terminal characterized by comprising comparing unit, switch unit, in which:
The comparing unit is connect with the switch unit and charging interface respectively, for according to the reception charging interface
Surge voltage output level makes the switching means conductive connected to it or cut-off；
The switch unit is connect with the comparing unit and current-limiting protection chip respectively, for according to the ratio received
Level compared with unit output carries out on or off, enables the current-limiting protection chip on or off.
8. mobile terminal according to claim 7, which is characterized in that the comparing unit, for being filled according to reception
The surge voltage output level of electrical interface makes the switching means conductive connected to it or cut-off；Include:
Low level is exported when receiving the surge voltage of charging interface less than predeterminated voltage, makes switching means conductive；
High level is exported when receiving the surge voltage of charging interface greater than predeterminated voltage, ends switch unit.
9. mobile terminal according to claim 7, which is characterized in that the switch unit, for according to the institute received
The level for stating comparing unit output carries out on or off, enables the current-limiting protection chip on or off；Include:
The low level of the comparing unit output is received, switching means conductive enables the current-limiting protection core connected to it
Piece conducting；
The high level of the comparing unit output is received, switch unit cut-off enables the current-limiting protection core connected to it
Piece cut-off.
10. mobile terminal according to claim 6, which is characterized in that the voltage overshoot protective device further include: described
Filter unit is connect with the switch unit, is filtered for the output to the switch unit, and the switch unit is made
Output smoothing is stablized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811551064.5A CN109599830A (en) | 2018-12-18 | 2018-12-18 | A kind of voltage overshoot protective device and mobile terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811551064.5A CN109599830A (en) | 2018-12-18 | 2018-12-18 | A kind of voltage overshoot protective device and mobile terminal |
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| CN109599830A true CN109599830A (en) | 2019-04-09 |
Family
ID=65963849
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811551064.5A Pending CN109599830A (en) | 2018-12-18 | 2018-12-18 | A kind of voltage overshoot protective device and mobile terminal |
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Application publication date: 20190409 |