CN107645151A - A kind of current foldback circuit, control method and device, terminal - Google Patents
A kind of current foldback circuit, control method and device, terminal Download PDFInfo
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- CN107645151A CN107645151A CN201710905491.8A CN201710905491A CN107645151A CN 107645151 A CN107645151 A CN 107645151A CN 201710905491 A CN201710905491 A CN 201710905491A CN 107645151 A CN107645151 A CN 107645151A
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- switch pipe
- power switch
- circuit
- current foldback
- terminal
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Abstract
The invention discloses a kind of current foldback circuit, control method and device, terminal, the current foldback circuit includes power switch pipe and bleeder circuit；Power switch pipe includes the first power switch pipe and the second power switch pipe；The first end of first power switch pipe and the three-terminal link of the second power switch pipe, the second end of the first power switch pipe are connected with terminal supplying power output end, and the 3rd end of the first power switch pipe and terminal are that the power pin that OTG equipment is powered is connected；The power pin that the first end of bleeder circuit is powered with OTG equipment is connected, and the second end of bleeder circuit is connected to ground；3rd end of bleeder circuit is connected with the first end of the second power switch pipe；Second end of the second power switch pipe is connected to ground.The present invention can effectively solve the problem that OTG equipment inserts improper the problem of causing short circuit, excessively stream, realizes overcurrent protection, improves reliability, the stability of end product, reduce after-sales service cost.
Description
Technical field
The present invention relates to electronic technology field, more particularly to a kind of current foldback circuit, control method and device, terminal.
Background technology
At present, the connector of USB (Universal Serial Bus, USB) two-sided insertion of interface is supported,
Such as Type-C connectors, this kind of connector due to supporting from pluggable " positive anti-plug " function of tow sides, for
Family use brings great convenience.Therefore, it is increasing in mobile phone, tablet personal computer or other portable products etc. that carry
In terminal, start to use this kind of connector with " positive anti-plug " function, to realize adaptor charge interface and data transmission terminal
The functions such as mouth.
However, just because of the pluggable characteristic of this kind of connector, as the external OTG (On- of terminal using this kind of connector
The-Go) during equipment, in the case of OTG device damages or OTG equipment insertion terminal when it is incomplete with this kind of connector
In the case of contraposition, it is possible to the situation of+5VPIN pin shorted to earths of this kind of connector occur, can be produced under this situation
High current, it is most likely that burn terminal, property loss and security risk are brought to user.
The content of the invention
It is a primary object of the present invention to propose a kind of current foldback circuit, control method and device, terminal, it is intended to solve
The problem of prior art is present.
To achieve the above object, first aspect of the embodiment of the present invention provides a kind of current foldback circuit, the overcurrent protection
Circuit includes power switch pipe and bleeder circuit；
The power switch pipe includes the first power switch pipe and the second power switch pipe；
The first end of first power switch pipe and the three-terminal link of second power switch pipe, first work(
Second end of rate switching tube is connected with terminal supplying power output end, and the 3rd end of first power switch pipe is set with terminal for OTG
The power pin connection of available electricity；
The power pin that the first end of the bleeder circuit is powered with OTG equipment is connected, the second end of the bleeder circuit
It is connected to ground；3rd end of the bleeder circuit is connected with the first end of second power switch pipe；
Second end of second power switch pipe is connected to ground.
Optionally, the current foldback circuit also includes charging circuit；
The first end of the charging circuit is connected with terminal supplying power output end, and the second end and the ground of the charging circuit connect
Connect, the 3rd end of the charging circuit is connected with the first end of first power switch pipe；
Optionally, the charging circuit includes first resistor and the electric capacity being connected in series；
One end of the first resistor is connected with terminal supplying power output end, the other end of the first resistor and the electric capacity
One end and first power switch pipe first end connection；
The other end of the electric capacity is connected to ground.
Optionally, the bleeder circuit includes the second resistance and 3rd resistor being connected in series；
The power pin that one end of the second resistance powers with OTG equipment is connected, the other end of the second resistance with
The first end of one end of the 3rd resistor and second power switch pipe connects；
The other end of the 3rd resistor is connected to ground.
Optionally, first power switch pipe is P-type mos field effect transistor M OS, described the
Two power switch pipes are positive-negative-positive bipolar transistor.
In addition, to achieve the above object, second aspect of the embodiment of the present invention provides a kind of terminal, the terminal includes first
Current foldback circuit described in aspect.
In addition, to achieve the above object, the third aspect of the embodiment of the present invention provides a kind of controlling party of current foldback circuit
Method, the current foldback circuit include power switch pipe and bleeder circuit；Methods described includes step：
Obtain the magnitude of voltage of bleeder circuit；
If the magnitude of voltage of the bleeder circuit is less than preset voltage value, the first power switch pipe and the second power is controlled to open
Pipe cut-off is closed, to cause terminal supplying power output end to be disconnected with OTG equipment.
Optionally, methods described also includes step：
If the magnitude of voltage of the bleeder circuit is higher than preset voltage value, first power switch pipe and described are controlled
Two power switch pipes turn on, to cause the terminal supplying power output end is established with the OTG equipment to connect.
Furthermore to achieve the above object, fourth aspect of the embodiment of the present invention provides a kind of control dress of current foldback circuit
Put, described device includes detection module and control module；
The detection module is used for the magnitude of voltage for obtaining bleeder circuit；
If the magnitude of voltage that the control module is used for the bleeder circuit is less than preset voltage value, the first power is controlled to open
Pipe and the cut-off of the second power switch pipe are closed, to cause terminal supplying power output end to be disconnected with OTG equipment.
Optionally, if the magnitude of voltage that the control module is additionally operable to the bleeder circuit is higher than preset voltage value, control
First power switch pipe and second power switch pipe conducting, to cause the terminal supplying power output end and the OTG
Equipment establishes connection.
Current foldback circuit provided in an embodiment of the present invention, control method and device, terminal, can effectively solve the problem that OTG is set
It is standby to insert improper the problem of causing short circuit, excessively stream, overcurrent protection is realized, improves reliability, the stability of end product, is dropped
Low after-sales service cost.
Brief description of the drawings
Fig. 1 is the hardware architecture diagram for the mobile terminal for realizing each embodiment of the present invention；
Fig. 2 is a kind of communications network system Organization Chart provided in an embodiment of the present invention；
Fig. 3 is the current foldback circuit structural representation of first embodiment of the invention；
Fig. 4 is the control method schematic flow sheet of the current foldback circuit of third embodiment of the invention；
Fig. 5 is the controling device structure diagram of the current foldback circuit of fourth embodiment of the invention.
The realization, functional characteristics and advantage of the object of the invention will be described further referring to the drawings in conjunction with the embodiments.
Embodiment
It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
In follow-up description, the suffix using such as " module ", " part " or " unit " for representing element is only
Be advantageous to the explanation of the present invention, itself there is no a specific meaning.Therefore, " module ", " part " or " unit " can mix
Ground uses.
Terminal can be implemented in a variety of manners.For example, the terminal described in the present invention can include such as mobile phone, flat board
Computer, notebook computer, palm PC, personal digital assistant (Personal Digital Assistant, PDA), portable
Media player (Portable Media Player, PMP), guider, wearable device, Intelligent bracelet, pedometer etc. move
Dynamic terminal, and the fixed terminal such as digital TV, desktop computer.
It will be illustrated in subsequent descriptions by taking mobile terminal as an example, it will be appreciated by those skilled in the art that except special
Outside element for moving purpose, construction according to the embodiment of the present invention can also apply to the terminal of fixed type.
Referring to Fig. 1, its hardware architecture diagram for a kind of mobile terminal of each embodiment of the realization present invention, the shifting
Dynamic terminal 100 can include：RF (Radio Frequency, radio frequency) unit 101, WiFi module 102, audio output unit
103rd, A/V (audio/video) input block 104, sensor 105, display unit 106, user input unit 107, interface unit
108th, the part 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 form the restriction to mobile terminal, and mobile terminal can be included than illustrating more or less parts,
Either combine some parts or different parts arrangement.
The all parts of mobile terminal are specifically introduced with reference to Fig. 1：
Radio frequency unit 101 can be used for receiving and sending messages or communication process in, the reception and transmission of signal, specifically, by base station
Downlink information receive after, handled to processor 110；In addition, up data are sent to base station.Generally, radio frequency unit 101
Including but not limited to antenna, at least one amplifier, transceiver, coupler, low-noise amplifier, duplexer etc..In addition, penetrate
Frequency unit 101 can also be communicated by radio communication with network and other equipment.Above-mentioned radio communication can use any communication
Standard or agreement, including but not limited to GSM (Global System of Mobile communication, global system for mobile telecommunications
System), GPRS (General Packet Radio Service, general packet radio service), CDMA2000 (Code
Division Multiple Access 2000, CDMA 2000), WCDMA (Wideband Code Division
Multiple Access, WCDMA), TD-SCDMA (Time Division-Synchronous Code
Division Multiple Access, TD SDMA), FDD-LTE (Frequency Division
Duplexing-Long Term Evolution, FDD 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, browse webpage and access streaming video etc., it has provided the user wireless broadband internet and accessed.Although Fig. 1 shows
Go out WiFi module 102, but it is understood that, it is simultaneously not belonging to must be configured into for mobile terminal, completely can be according to need
To be omitted in the essential scope for do not change 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 receiving or
It is sound that the voice data stored in memory 109, which is converted into audio signal and exported,.Moreover, audio output unit 103
The audio output related to the specific function that mobile terminal 100 performs can also be provided (for example, call signal receives sound, disappeared
Breath receives sound etc.).Audio output unit 103 can include loudspeaker, buzzer etc..
A/V input blocks 104 are used to receive audio or video signal.A/V input blocks 104 can include graphics processor
(Graphics Processing Unit, GPU) 1041 and microphone 1042, graphics processor 1041 is in video acquisition mode
Or the static images or the view data of video obtained in image capture mode by image capture apparatus (such as camera) are carried out
Reason.Picture frame after processing may be displayed on display unit 106.Picture frame after the processing of graphics processor 1041 can be deposited
Storage is transmitted in memory 109 (or other storage mediums) or via radio frequency unit 101 or WiFi module 102.Mike
Wind 1042 can connect in telephone calling model, logging mode, speech recognition mode etc. operational mode via microphone 1042
Quiet down sound (voice data), and can be voice data by such acoustic processing.Audio (voice) data after processing can
To be converted to the form output that mobile communication base station can be sent to via radio frequency unit 101 in the case of telephone calling model.
Microphone 1042 can implement various types of noises and eliminate (or suppression) algorithm to eliminate (or suppression) in reception and send sound
Caused noise or interference during frequency signal.
Mobile terminal 100 also 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 transducer, wherein, ambient light sensor can be according to environment
The light and shade of light adjusts the brightness of display panel 1061, and proximity transducer can close when mobile terminal 100 is moved in one's ear
Display panel 1061 and/or backlight.As one kind of motion sensor, accelerometer sensor can detect in all directions (general
For three axles) size of acceleration, size and the direction of gravity are can detect that when static, the application available for identification mobile phone posture
(such as horizontal/vertical screen switching, dependent game, magnetometer pose calibrating), Vibration identification correlation function (such as pedometer, percussion) etc.；
The fingerprint sensor that can also configure as mobile phone, pressure sensor, iris sensor, molecule sensor, gyroscope, barometer,
The other sensors such as hygrometer, thermometer, infrared ray sensor, will not be repeated here.
Display unit 106 is used for the information for showing the information inputted by user or being supplied to user.Display unit 106 can wrap
Display panel 1061 is included, liquid crystal display (Liquid Crystal Display, LCD), Organic Light Emitting Diode can be used
Forms such as (Organic Light-Emitting Diode, OLED) configures display panel 1061.
User input unit 107 can be used for the numeral or character information for receiving input, and produce the use with mobile terminal
The key signals input that family is set and function control is relevant.Specifically, user input unit 107 may include contact panel 1071 with
And other input equipments 1072.Contact panel 1071, also referred to as touch-screen, collect touch operation of the user on or near it
(for example user uses any suitable objects or annex such as finger, stylus on contact panel 1071 or in contact panel 1071
Neighbouring operation), and corresponding attachment means are driven according to formula set in advance.Contact panel 1071 may include touch detection
Two parts of device and touch controller.Wherein, the touch orientation of touch detecting apparatus detection user, and detect touch operation band
The signal come, transmits a signal to touch controller；Touch controller receives touch information from touch detecting apparatus, and by it
Contact coordinate is converted into, then gives processor 110, and the order sent of reception processing device 110 and can be performed.In addition, can
To realize contact panel 1071 using polytypes such as resistance-type, condenser type, infrared ray and surface acoustic waves.Except contact panel
1071, user input unit 107 can also include other input equipments 1072.Specifically, other input equipments 1072 can wrap
Include but be not limited to physical keyboard, in function key (such as volume control button, switch key etc.), trace ball, mouse, action bars etc.
One or more, do not limit herein specifically.
Further, contact panel 1071 can cover display panel 1061, detect thereon when contact panel 1071 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, contact panel 1071 and display panel
1061 be the part independent as two to realize the input of mobile terminal and output function, but in certain embodiments, can
Input and the output function of mobile terminal are realized so that contact panel 1071 and display panel 1061 is integrated, is not done herein specifically
Limit.
Interface unit 108 is connected the interface that can pass through as at least one external device (ED) with mobile terminal 100.For example,
External device (ED) can include wired or wireless head-band earphone port, external power source (or battery charger) port, wired or nothing
Line FPDP, 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 the input from external device (ED) (for example, number
It is believed that breath, electric power etc.) and the input received is transferred to one or more elements in mobile terminal 100 or can be with
For transmitting data between mobile terminal 100 and external device (ED).
Memory 109 can be used for storage software program and various data.Memory 109 can mainly include storing program area
And storage data field, wherein, storing program area can storage program area, application program (such as the sound needed at least one function
Sound playing function, image player function etc.) etc.；Storage data field can store according to mobile phone use created data (such as
Voice data, phone directory etc.) etc..In addition, memory 109 can include high-speed random access memory, can also include non-easy
The property lost memory, a for example, at least 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 whole mobile terminal of connection
Individual part, by running or performing the software program and/or module that are stored in memory 109, and call and be stored in storage
Data in device 109, the various functions and processing data of mobile terminal are performed, so as to carry out integral monitoring to mobile terminal.Place
Reason device 110 may include one or more processing units；Preferably, processor 110 can integrate application processor and modulatedemodulate is mediated
Device is managed, wherein, application processor mainly handles operating system, user interface and application program etc., and modem processor is main
Handle radio 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) to all parts power supply, it is preferred that power supply 111
Can be logically contiguous by power-supply management system and processor 110, so as to realize management charging by power-supply management system, put
The function such as electricity and power managed.
Although Fig. 1 is not shown, mobile terminal 100 can also will not be repeated here including bluetooth module etc..
For the ease of understanding the embodiment of the present invention, the communications network system being based on below to the mobile terminal of the present invention enters
Row description.
Referring to Fig. 2, Fig. 2 is a kind of communications network system Organization Chart provided in an embodiment of the present invention, the communication network system
Unite as the LTE system of universal mobile communications technology, the UE that the LTE system includes communicating connection successively (User Equipment, is used
Family equipment) 201, E-UTRAN (Evolved UMTS Terrestrial Radio Access Network, evolved UMTS lands
Ground wireless access network) 202, EPC (Evolved Packet Core, evolved packet-based core networks) 203 and operator IP operation
204。
Specifically, UE201 can be above-mentioned terminal 100, and here is omitted.
E-UTRAN202 includes eNodeB2021 and other eNodeB2022 etc..Wherein, eNodeB2021 can be by returning
Journey (backhaul) (such as X2 interface) is connected with other eNodeB2022, and eNodeB2021 is connected to EPC203,
ENodeB2021 can provide UE201 to EPC203 access.
EPC203 can 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 between EPC203, there is provided carrying and connection management.HSS2032 is all to manage for providing some registers
Such as the function of attaching position register (not shown) etc, and preserve some and used about service features, data rate etc.
The special information in family.All customer data can be transmitted by SGW2034, and PGW2035 can provide UE 201 IP
Address is distributed and other functions, and PCRF2036 is strategy and the charging control strategic decision-making of business data flow and IP bearing resources
Point, it selects and provided available strategy and charging control decision-making with charge execution function unit (not shown) for strategy.
IP operation 204 can include internet, Intranet, IMS (IP Multimedia Subsystem, IP multimedia
System) or other IP operations etc..
Although above-mentioned be described by taking LTE system as an example, those skilled in the art it is to be understood that the present invention not only
Suitable for LTE system, be readily applicable to other wireless communication systems, such as GSM, CDMA2000, WCDMA, TD-SCDMA with
And following new network system etc., do not limit herein.
Based on above-mentioned mobile terminal hardware configuration and communications network system, each embodiment of the inventive method is proposed.
First embodiment
As shown in figure 3, Fig. 3 is a kind of current foldback circuit that first embodiment of the invention provides, the overcurrent protection electricity
Road 30 includes power switch pipe and bleeder circuit 31；
The power switch pipe includes the first power switch pipe Q1 and the second power switch pipe Q2；
The first end of the first power switch pipe Q1 and the second power switch pipe Q2 three-terminal link, described the
One power switch pipe Q1 the second end is connected with terminal supplying power output end (shown in the A1 in figure), the first power switch pipe Q1
The 3rd end and terminal be that the power pin of OTG equipment power supply is connected (shown in the A2 in figure)；
The first end of the bleeder circuit 31 is connected with the power pin that OTG equipment is powered, and the of the bleeder circuit 31
Two ends are connected to ground；3rd end of the bleeder circuit 31 is connected with the first end of the second power switch pipe Q2；
The second end of the second power switch pipe Q2 is connected to ground.
In the present embodiment, the bleeder circuit 31 includes the second resistance R2 and 3rd resistor R3 being connected in series；
One end of the second resistance R2 is connected with the power pin that OTG equipment is powered, and the second resistance R2's is another
End is connected with one end of the 3rd resistor R3 and the first end of the second power switch pipe Q2；
The other end of the 3rd resistor R3 is connected to ground.
It should be noted that the resistance quantity in bleeder circuit 31 is not restricted.
It refer again to shown in Fig. 3, in one embodiment, the first power switch pipe Q1 is p-type metal-oxide-semiconductor
(Metal-Oxide-Semiconductor Field-Effect Transistor, metal oxide semiconductor field effect transistor
Pipe), the second power switch pipe Q2 is positive-negative-positive bipolar transistor.
The first end of the first power switch pipe Q1 is the grid (shown in the G in figure) of metal-oxide-semiconductor, first power
Switching tube Q1 the second end is the source electrode (shown in the S in figure) of metal-oxide-semiconductor, and the first end of the first power switch pipe Q1 is
The drain electrode of metal-oxide-semiconductor (shown in the D in figure).
In the present embodiment, the operation principle of the first power switch pipe Q1 is：It is less than source voltage in grid voltage
During to certain amplitude, drain electrode and source electrode both ends will turn on；When grid voltage is more than or equal to source voltage, drain electrode and source electrode
Both ends will end, and be not turned on.
The first end of the second power switch pipe Q2 is the base stage (shown in the B in figure) of positive-negative-positive bipolar transistor,
The second end of the second power switch pipe Q2 is the emitter stage (shown in the E in figure) of positive-negative-positive bipolar transistor, and described
Two power switch pipe Q2 the 3rd end is the colelctor electrode of positive-negative-positive bipolar transistor (shown in the C in figure).
In the present embodiment, the operation principle of the second power switch pipe Q2 and the first power switch pipe Q1 work are former
Manage similar, therefore not to repeat here.
Further, the current foldback circuit 30 also includes charging circuit 32；
The first end of the charging circuit 32 is connected with terminal supplying power output end, the second end and the ground of the charging circuit 32
Connection, the 3rd end of the charging circuit 32 is connected with the first end of first power switch pipe.
In the present embodiment, the charging circuit 32 includes the first resistor R1 and electric capacity C being connected in series；
One end of the first resistor R1 is connected with terminal supplying power output end, the other end of the first resistor R1 with it is described
Electric capacity C one end and the first power switch pipe Q1 first end connect；
The other end of the electric capacity C is connected to ground.
In the present embodiment, the course of work of current foldback circuit is as follows：When A1 points gradually rise to 5V from 0V, pass through
Resistance R1 is charged to electric capacity C, and A3 point voltages are begun to ramp up from 0V, and A1 point voltage ratio A3 points rise soon, so the first power
Switching tube Q1 is begun to turn on, so as to which A4 point voltages also begin to rise, when A4 point voltages reach more than 0.7V, and the second power switch
Pipe Q2 is turned on so that A3 points voltage is toward declining, and the first power switch pipe Q1 is fully on, and A2 points voltage is equal to A1 points, and terminal is opened
Begin to power for OTG equipment.
When output short-circuit or excessively stream, A4 point voltages drop to 0.65V or so, the second power switch pipe Q2 with A2 point voltages
When shut-off, A3 point voltages rise to A3-A1 pressure differences and is less than 1V, the first power switch pipe Q1 is turned off, so as to cut off load protection system
System not power down.
Current foldback circuit provided in an embodiment of the present invention, it can effectively solve the problem that the insertion of OTG equipment is improper and cause short circuit, mistake
The problem of stream, overcurrent protection is realized, improve reliability, the stability of end product, reduce after-sales service cost.
Second embodiment
Second embodiment of the invention provides a kind of terminal, and the terminal includes the overcurrent protection electricity described in first embodiment
Road.Current foldback circuit refers to the above, and therefore not to repeat here.
The course of work of the current foldback circuit in terminal is illustrated below in conjunction with Fig. 1：
When A1 points gradually rise to 5V from 0V, electric capacity C is charged by resistance R1, A3 point voltages since 0V on
Rising, A1 point voltage ratio A3 points rise soon, so the first power switch pipe Q1 is begun to turn on, so as to which A4 point voltages also begin to rise,
When A4 point voltages reach more than 0.7V, the second power switch pipe Q2 conductings so that A3 points voltage is past to be declined, the first power switch
Pipe Q1 is fully on, and A2 points voltage is equal to A1 points, and terminal starts to power for OTG equipment.
When output short-circuit or excessively stream, A4 point voltages drop to 0.65V or so, the second power switch pipe Q2 with A2 point voltages
When shut-off, A3 point voltages rise to A3-A1 pressure differences and is less than 1V, the first power switch pipe Q1 is turned off, so as to cut off load protection system
System not power down.
Terminal provided in an embodiment of the present invention, it can effectively solve the problem that the insertion of OTG equipment is improper and cause short-circuit, excessively stream ask
Topic, realizes overcurrent protection, improves reliability, the stability of end product, reduce after-sales service cost.
3rd embodiment
Current foldback circuit based on first embodiment, refer to Fig. 4, and Fig. 4 is one that third embodiment of the invention provides
The control method of kind current foldback circuit, methods described include step：
S41, the magnitude of voltage for obtaining bleeder circuit.
If the magnitude of voltage of S42, the bleeder circuit is less than preset voltage value, the first power switch pipe and the second work(are controlled
Rate switching tube ends, to cause terminal supplying power output end to be disconnected with OTG equipment.
In one embodiment, methods described also includes step：
If the magnitude of voltage of the bleeder circuit is higher than preset voltage value, first power switch pipe and described are controlled
Two power switch pipes turn on, to cause the terminal supplying power output end is established with the OTG equipment to connect.
As illustratively, illustrated below in conjunction with Fig. 1：
When A1 points gradually rise to 5V from 0V, electric capacity C is charged by resistance R1, A3 point voltages since 0V on
Rise, A1 point voltage ratio A3 points rise soon, so the first power switch pipe Q1 is begun to turn on, so as to the A4 point voltages of bleeder circuit
Begin to ramp up, when the A4 point voltages of bleeder circuit reach more than 0.7V, the second power switch pipe Q2 conductings so that A3 point voltages
Toward declining, the first power switch pipe Q1 is fully on, and A2 points voltage is equal to A1 points, and terminal starts to power for OTG equipment.
When output short-circuit or excessively stream, A4 point voltages drop to 0.65V or so, the second power switch pipe Q2 with A2 point voltages
When shut-off, A3 point voltages rise to A3-A1 pressure differences and is less than 1V, the first power switch pipe Q1 is turned off, so as to cut off load protection system
System not power down.
The control method of current foldback circuit provided in an embodiment of the present invention, it can effectively solve the problem that the insertion of OTG equipment is improper
The problem of causing short circuit, excessively stream, realizes overcurrent protection, improves reliability, the stability of end product, reduce and tie up after sale
Protect cost.
Fourth embodiment
Current foldback circuit based on first embodiment, refer to Fig. 5, and Fig. 5 is one that fourth embodiment of the invention provides
The control device of kind current foldback circuit, described device include detection module 51 and control module 52；
The detection module 51, for obtaining the magnitude of voltage of bleeder circuit.
The control module 52, if the magnitude of voltage for the bleeder circuit is less than preset voltage value, control the first work(
Rate switching tube and the cut-off of the second power switch pipe, to cause terminal supplying power output end to be disconnected with OTG equipment.
In one embodiment, the control module 52, if being additionally operable to the magnitude of voltage of the bleeder circuit higher than default
Magnitude of voltage, then first power switch pipe and second power switch pipe is controlled to turn on, to cause the terminal supplying power defeated
Go out end and establish connection with the OTG equipment.
As illustratively, illustrated below in conjunction with Fig. 1：
When A1 points gradually rise to 5V from 0V, electric capacity C is charged by resistance R1, A3 point voltages since 0V on
Rise, A1 point voltage ratio A3 points rise soon, so the first power switch pipe Q1 is begun to turn on, so as to the A4 point voltages of bleeder circuit
Begin to ramp up, when the A4 point voltages of bleeder circuit reach more than 0.7V, the second power switch pipe Q2 conductings so that A3 point voltages
Toward declining, the first power switch pipe Q1 is fully on, and A2 points voltage is equal to A1 points, and terminal starts to power for OTG equipment.
When output short-circuit or excessively stream, A4 point voltages drop to 0.65V or so, the second power switch pipe Q2 with A2 point voltages
When shut-off, A3 point voltages rise to A3-A1 pressure differences and is less than 1V, the first power switch pipe Q1 is turned off, so as to cut off load protection system
System not power down.
The control device of current foldback circuit provided in an embodiment of the present invention, it can effectively solve the problem that the insertion of OTG equipment is improper
The problem of causing short circuit, excessively stream, realizes overcurrent protection, improves reliability, the stability of end product, reduce and tie up after sale
Protect cost.
, can be in any combination in the case where not conflicting between technical scheme described in the embodiment of the present invention.
In several embodiments provided by the present invention, it should be understood that disclosed method and smart machine, Ke Yitong
Other modes are crossed to realize.Apparatus embodiments described above are only schematical, for example, the division of the unit, only
Only a kind of division of logic function, can have other dividing mode, such as when actually realizing：Multiple units or component can be tied
Close, or be desirably integrated into another system, or some features can be ignored, or do not perform.In addition, shown or discussed each group
Into the mutual coupling in part or direct-coupling or communication connection can be by some interfaces, equipment or unit it is indirect
Coupling or communication connection, can be electrical, mechanical or other forms.
The above-mentioned unit illustrated as separating component can be or may not be physically separate, show as unit
The part shown can be or may not be physical location, you can positioned at a place, can also be distributed to multiple network lists
In member；Partly or entirely unit therein can be selected to realize the purpose of this embodiment scheme according to the actual needs.
In addition, each functional unit in various embodiments of the present invention can be fully integrated into a second processing unit,
Can also be each unit individually as a unit, can also two or more units it is integrated in a unit；
Above-mentioned integrated unit can both be realized in the form of hardware, and hardware can also be used to add the form of SFU software functional unit real
It is existing.
The foregoing is only a specific embodiment of the invention, but protection scope of the present invention is not limited thereto, any
Those familiar with the art the invention discloses technical scope in, change or replacement can be readily occurred in, should all be contained
Cover within protection scope of the present invention.
Claims (10)
1. a kind of current foldback circuit, it is characterised in that the current foldback circuit includes power switch pipe and bleeder circuit；
The power switch pipe includes the first power switch pipe and the second power switch pipe；
The first end of first power switch pipe and the three-terminal link of second power switch pipe, first power are opened
The second end for closing pipe is connected with terminal supplying power output end, and the 3rd end of first power switch pipe supplies with terminal for OTG equipment
The power pin connection of electricity；
The power pin that the first end of the bleeder circuit is powered with OTG equipment is connected, the second end and the ground of the bleeder circuit
Connection；3rd end of the bleeder circuit is connected with the first end of second power switch pipe；
Second end of second power switch pipe is connected to ground.
2. a kind of current foldback circuit according to claim 1, it is characterised in that the current foldback circuit also includes filling
Circuit；
The first end of the charging circuit is connected with terminal supplying power output end, and the second end of the charging circuit is connected to ground, institute
The 3rd end for stating charging circuit is connected with the first end of first power switch pipe.
3. a kind of current foldback circuit according to claim 2, it is characterised in that the charging circuit includes being connected in series
First resistor and electric capacity；
One end of the first resistor is connected with terminal supplying power output end, the other end of the first resistor and the one of the electric capacity
The connection of the first end of end and first power switch pipe；
The other end of the electric capacity is connected to ground.
4. a kind of current foldback circuit according to claim 1, it is characterised in that the bleeder circuit includes being connected in series
Second resistance and 3rd resistor；
The power pin that one end of the second resistance powers with OTG equipment is connected, the other end of the second resistance with it is described
The first end of one end of 3rd resistor and second power switch pipe connects；
The other end of the 3rd resistor is connected to ground.
5. a kind of current foldback circuit according to claim 1, it is characterised in that first power switch pipe is p-type
Mos field effect transistor MOS, second power switch pipe are positive-negative-positive bipolar transistor.
6. a kind of terminal, it is characterised in that the terminal includes any described current foldback circuits of claim 1-5.
7. a kind of control method of current foldback circuit, the current foldback circuit includes power switch pipe and bleeder circuit；Its
It is characterised by, methods described includes step：
Obtain the magnitude of voltage of bleeder circuit；
If the magnitude of voltage of the bleeder circuit is less than preset voltage value, the first power switch pipe and the second power switch pipe are controlled
Cut-off, to cause terminal supplying power output end to be disconnected with OTG equipment.
8. the control method of a kind of current foldback circuit according to claim 7, it is characterised in that methods described also includes
Step：
If the magnitude of voltage of the bleeder circuit is higher than preset voltage value, first power switch pipe and second work(are controlled
Rate switching tube turns on, to cause the terminal supplying power output end is established with the OTG equipment to connect.
9. a kind of control device of current foldback circuit, it is characterised in that described device includes detection module and control module；
The detection module is used for the magnitude of voltage for obtaining bleeder circuit；
If the magnitude of voltage that the control module is used for the bleeder circuit is less than preset voltage value, the first power switch pipe is controlled
End with the second power switch pipe, to cause terminal supplying power output end to be disconnected with OTG equipment.
A kind of 10. control device of current foldback circuit according to claim 9, it is characterised in that the control module
If the magnitude of voltage for being additionally operable to the bleeder circuit is higher than preset voltage value, first power switch pipe and described second are controlled
Power switch pipe turns on, to cause the terminal supplying power output end is established with the OTG equipment to connect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710905491.8A CN107645151A (en) | 2017-09-29 | 2017-09-29 | A kind of current foldback circuit, control method and device, terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710905491.8A CN107645151A (en) | 2017-09-29 | 2017-09-29 | A kind of current foldback circuit, control method and device, terminal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107645151A true CN107645151A (en) | 2018-01-30 |
Family
ID=61122875
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710905491.8A Pending CN107645151A (en) | 2017-09-29 | 2017-09-29 | A kind of current foldback circuit, control method and device, terminal |
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| Country | Link |
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| CN (1) | CN107645151A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108879589A (en) * | 2018-05-31 | 2018-11-23 | Oppo（重庆）智能科技有限公司 | over-current protection method, device, terminal device and storage medium |
| CN109274061A (en) * | 2018-11-27 | 2019-01-25 | 道崇电子科技（嘉兴）有限公司 | A kind of overcurrent and short-circuit protection circuit |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106711928A (en) * | 2017-01-16 | 2017-05-24 | 努比亚技术有限公司 | Short-circuit protection device, as well as short-circuit protection method and short-circuit protection circuit thereof |
| CN106877283A (en) * | 2017-04-28 | 2017-06-20 | 广东欧珀移动通信有限公司 | A kind of electronic equipment and its power protecting circuit |
| CN106992492A (en) * | 2017-05-18 | 2017-07-28 | 努比亚技术有限公司 | A kind of current foldback circuit, power interface and mobile terminal |
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2017
- 2017-09-29 CN CN201710905491.8A patent/CN107645151A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106711928A (en) * | 2017-01-16 | 2017-05-24 | 努比亚技术有限公司 | Short-circuit protection device, as well as short-circuit protection method and short-circuit protection circuit thereof |
| CN106877283A (en) * | 2017-04-28 | 2017-06-20 | 广东欧珀移动通信有限公司 | A kind of electronic equipment and its power protecting circuit |
| CN106992492A (en) * | 2017-05-18 | 2017-07-28 | 努比亚技术有限公司 | A kind of current foldback circuit, power interface and mobile terminal |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108879589A (en) * | 2018-05-31 | 2018-11-23 | Oppo（重庆）智能科技有限公司 | over-current protection method, device, terminal device and storage medium |
| CN109274061A (en) * | 2018-11-27 | 2019-01-25 | 道崇电子科技（嘉兴）有限公司 | A kind of overcurrent and short-circuit protection circuit |
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Application publication date: 20180130 |