CN109388601A - A kind of OTG power supply, charging automatic switching module and its control method - Google Patents
A kind of OTG power supply, charging automatic switching module and its control method Download PDFInfo
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- CN109388601A CN109388601A CN201710680475.3A CN201710680475A CN109388601A CN 109388601 A CN109388601 A CN 109388601A CN 201710680475 A CN201710680475 A CN 201710680475A CN 109388601 A CN109388601 A CN 109388601A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/40—Bus structure
- G06F13/4063—Device-to-bus coupling
- G06F13/4068—Electrical coupling
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2213/00—Indexing scheme relating to interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F2213/0042—Universal serial bus [USB]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management
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Abstract
The present invention provides a kind of OTG power supply, charging automatic switching module and its control methods, No.1 interface, No. two interfaces for connecting charger, No. three interfaces for connecting the external equipment for needing OTG to power including CMOS chip, for connecting the Host equipment for having OTG function；The CMOS chip includes the port E, Y-port, the port Z, and the port E is electrically connected with No. two interfaces, and the port Z ground connection, Y-port is electrically connected with No.1 interface.The present invention is not necessarily to manual switch in external equipment use process, and the equipment for supporting OTG function can be allowed to automatically switch OTG powering mode and charge mode；It can charge under the uninterrupted use state for keeping external equipment to OTG equipment；Simultaneously using CMOS chip as core devices come the switching of automatic identification and control OTG and charge mode, small in size, at low cost, power consumption almost can be ignored, long service life, and cost performance is high, easy to integrate, and be conducive to be mass produced.
Description
Technical field
The present invention relates to a kind of OTG power supply, charging automatic switching module and its control method, it is mainly used for OTG data/fill
Electric wire, OTG external equipment etc..
Background technique
The development of USB technology enables PC and peripheral equipment by simple mode, the manufacturing cost of appropriateness, will be each
The equipment of kind data transmission bauds links together.It is connected to PC by USB, and carries out data exchange under the control of PC.
But this convenient exchanged form, once having left PC, each equipment room can not be operated using USB port, because
None potentially acts as the same host of PC from equipment.
OTG is the abbreviation of On-The-Go, is the technology that developed recently gets up, be mainly used in a variety of different equipment or
Connection between mobile device carries out data exchange.Such as Pad, mobile phone, tablet computer, digital camera, video camera, printer
Equipment.
OTG technology is exactly to realize the data transmission of equipment room in the case where no PC.Such as digital camera is directly connected to
Onto printer, by OTG technology, the USB port of two equipment rooms is connected, the photograph taken is printed immediately；It can also be with
It by the data in digital camera, is sent on the mobile hard disk of USB interface by OTG, field operation is just not necessarily to carry
Expensive storage card, or one portable computer of back.
USB device is divided into HOST (main equipment) and SLAVE (from equipment), only when a HOST is connect with a SLAVE
When be just able to achieve the transmission of data, OTG equipment is exactly that our " EX " can serve as HOST, can also serve as SLAVE.
Current OTG equipment is generally worked normally using traditional relay and manual switch or is switched power supply mould
Formula, but in actual use, manual switch operation is more troublesome, and relay needs to cooperate MCU device and writes complexity
MCU controls program, and higher cost, equipment volume is big, and power consumption is big, and cost performance is not high.
Traditional scheme controls the on-off relationship between S and G pin using manual switch, very inconvenient.It is manually controlling
During switch, it not can guarantee and whether the coordinating and unifying of charging is attempted to OTG equipment with external, can not normally realize switching, meeting
System crash is caused, or even needs system reboot that could restore normal operating conditions.
It is simple wrong using the patent formula of relay itself, not can guarantee from charging be transformed into OTG state this
Relay works normally always during a, and relay is bulky, and access times are limited, and power consumption is big, at all can not be
It is realized in the high product of cost performance.
Needing the scheme of MCU self-powered must guarantee always to be powered MCU.And MCU is at high cost, programming is multiple
It is miscellaneous, along with from charged pool, volume is big, it is difficult to large-scale commercial.
Such as the Chinese patent of Patent No. 200810108684.1, a kind of data transmission set, control circuit core are disclosed
Piece and operating mode control method, using relay as on-off switch, by circuit design according to whether there is external charge power supply
For according to the break-make situation for automatically switching relay.First this patent circuit design the problem of, can not realize well automatic
The function of switching；Secondly, relay itself has many defects: volume is big, and power consumption is big, and poor reliability is easily damaged, service life
It is short, it can not really apply small in size, in the high product of cost performance.
The for another example Chinese patent of Patent No. 201410576624.8 discloses a kind of based on the bidirectional balanced electricity of USB-OTG
The method and device of amount, it is believed that the differentiation of OTG and non-OTG are the level according to ID, are that system judges automatically ID level to determine
It is in OTG state or charged state.But according to the working principle of OTG, system should judge ID pin and ground pipe
Resistance value between foot (GND) is determined in OTG state or charged state.Some designs are due to that can not stablize on the market
Control resistance value so that product OTG/ charged state switching it is unstable, once generating system conflict, or even need restart
It can restore to work normally.Or it can be again not all right for other mobile phones for some mobile phones.
China Patent No. 201310396425.4 discloses a kind of USB OTG device, electronic equipment and realizes OTG function
Method, the state of external equipment can be judged by MCU, but be not described and next make where reason, applied in other words
It is unclear everywhere.
Summary of the invention
The technical problem to be solved by the present invention is to overcome the above-mentioned deficiency in the presence of the prior art, and one kind is provided and is set
Reasonable OTG power supply, charging automatic switching module and its control method are counted, in external equipment use process, using the module,
Without manual switch, the equipment for supporting OTG function can be allowed to automatically switch OTG powering mode and charge mode.
The technical proposal adopted by the invention to solve the above technical problems is that: mould is automatically switched in a kind of OTG power supply, charging
Block, it is characterised in that: it includes CMOS chip, the No.1 interface for connecting the Host equipment for having OTG function, for connecting
No. two interfaces of charger, No. three interfaces for connecting the external equipment for needing OTG to power；The CMOS chip includes E
Port, Y-port, the port Z, the port E are electrically connected with No. two interfaces, and the port Z ground connection, Y-port is electrically connected with No.1 interface.
No.1 interface is access to the USB interface of the Host equipment with OTG function, such as mobile phone, tablet computer etc.；No. two
Interface is access to the USB interface of charger；No. three interfaces are used to connect any external equipment for needing OTG to power, such as mobile
Hard disk, printer etc..
CMOS chip is exactly a switch.The port E is the control of this switch, and Y-port and the port Z are two ends of switch
Mouthful.That is the port E, which is drawn high, is equal to be to disconnect switch, so just disconnecting between two ports Y and Z, and works as the port E and draws
It is low to be equal to be to close switch, it is turned on using between two ports Y and Z.
When No. two interfaces connect charger, No.1 interface is connected on the equipment USB interface for supporting OTG function, CMOS core
The enable end port E of piece is raised, and CMOS chip disconnects automatically, is opened a way between Y-port and the port Z, and the connection of No.1 interface is set
It is standby to stop supplying power for outside, but still carry out data transmission through No.1 interface, No. three interfaces and external equipment.External equipment passes through at this time
No. two interfaces, No. three interfaces take electricity from charger；The host that charger connects No.1 interface simultaneously charges.
When the connection of No. two interfaces and charger disconnects, the enable end port E of CMOS chip is pulled low, and CMOS chip is automatic
Closure, is shorted between Y-port and the port Z, and the equipment of No.1 interface connection is automatically into OTG power supply state, through No.1 interface, three
Number interface is powered and is carried out data transmission to external equipment.
Using CMOS chip as core devices come automatic identification and control OTG and charge mode switching, it is small in size, at
This is low, and power consumption almost can be ignored, long service life, and cost performance is high, is easy integration, is conducive to be mass produced.It is not necessarily to
Manual operation controls program without increasing MCU device and writing complicated MCU.
Three interfaces of the present invention include four V (vcc), D+ (data+), D- (data-), G (gnd) pins,
It is electrically connected to each other between identical pin, wherein No.1 interface (J1) is additionally provided with pin S (Sense).
Data are transmitted by D+, D- pin between No.1 interface and No. three interfaces, are powered by V pin；No. two interfaces and
It is powered between No. three interfaces by V pin.
The Y-port of CMOS chip is electrically connected with S pin, logical between the S pin in No.1 interface and G pin for controlling
It is disconnected.Mobile phone etc. supports the smart machine of OTG supplying power for outside to determine by judging the on-off at itself USB interface between S and G pin
It is fixed whether supplying power for outside.Start to power if S and G is connected, stops powering if S and G open circuit.
A capacitor, one end ground connection of capacitor, the other end and No.1 interface are connected on CMOS chip of the present invention
V pin electrical connection.
Capacitor carries out CMOS chip for (being transformed into this period between OTG power supply from external charge) in a short time
Power supply, to guarantee that CMOS chip can be not only without external power supply, but also without in this time in the case where OTG power supply
Continue to work normally.
Diode is provided in the circuit of the present invention connected between No.1 interface V pin, No. two interface V pins.
The port E of CMOS chip cannot be flowed to from OTG Host equipment for limiting current direction, so that current direction is limited,
Accidentally the end E will not be drawn high because OTG powers.
The present invention also provides a kind of OTG power supplies, the control method of charging automatic switching module, it is characterised in that: it
Rate-determining steps are as follows:
(1) when using this module for the first time, first No.1 interface (J1) is connected on the host with OTG function, at this time also
OTG power supply state is not entered into；
(2) charger is connected to No. two interfaces (J2), charged to capacitor (C1), and then CMOS chip (U1) is allowed to enter
Normal operating conditions；The enable end port E of CMOS chip (U1) is raised at this time, CMOS chip (U1) automatically disconnect, Y-port and
Z opens a way between port；
(3) charger is pulled out, the enable end E of CMOS chip (U1) is pulled low, and CMOS chip (U1) is by capacitor (C1) at this time
It powers in short time and keeps normally being switched to closed state, be closed between Y-port and the port Z；At this moment host enters OTG power supply
State is also powered the external equipment of No. three interfaces (J3) above in addition to starting to power to CMOS chip (U1)；At this point,
Due to the function of the limitation current direction of diode (D1), so that will not maloperation from the OTG power supply that No.1 interface (J1) is provided
The enable end port E of CMOS chip (U1) is drawn high, so CMOS chip (U1) can be kept closed, and then ensure that one
Number interface (J1) is in OTG power supply state；
(4) as long as No.1 interface (J1) was not turned off, CMOS chip (U1) can according to No. two interfaces (J2) whether
It accesses charger and normally automatically switches OTG powering mode and charge data mode；
If No. two interfaces (J2) connect charger, the enable end port E of CMOS chip (U1) is raised, CMOS chip
(U1) automatic to disconnect, it opens a way between Y-port and the port Z, the host equipment of No.1 interface (J1) connection stops supplying power for outside, but main
Machine still carries out data transmission through No.1 interface (J1), No. three interfaces (J3) with external equipment；External equipment connects through No. two at this time
Mouth (J2), No. three interfaces (J3) take electricity from charger；The host that charger connects No.1 interface (J1) simultaneously fills
Electricity；
If the connection of No. two interfaces (J2) and charger disconnects, the enable end port E of CMOS chip (U1) is pulled low,
CMOS chip (U1) automatically be closed, be shorted between Y-port and the port Z, No.1 interface (J1) connection host equipment automatically into
OTG power supply state, host are powered and are carried out data transmission to external equipment through No.1 interface (J1), No. three interfaces (J3)；
(5) if No.1 interface (J1) disconnected or No.1 interface (J1) completely have a power failure, be again coupled to next time into
When row work, the step of repeating above-mentioned (1)~(3) is needed.
Compared with prior art, the present invention having following positive effect: in external equipment use process, utilizing the present invention
Module is not necessarily to manual switch, and the equipment for supporting OTG function can be allowed to automatically switch OTG powering mode and charge mode；It can be
It keeps charging to OTG equipment under the uninterrupted use state of external equipment；The module can be widely used in OTG data/
Charging cable, OTG external equipment, etc.；OTG and charging come automatic identification and are controlled as core devices using CMOS chip simultaneously
The switching of mode, small in size, at low cost, power consumption almost can be ignored, long service life, and cost performance is high, is easy integration, has
Conducive to large-scale production；Without manual operation, program is controlled without increasing MCU device and writing complicated MCU.
Detailed description of the invention
Fig. 1 is circuit diagram of the invention.
Specific embodiment
With reference to the accompanying drawing and the invention is further illustrated by the examples.
Embodiment:
Referring to Fig. 1, the present embodiment includes CMOS chip U1, for connecting has the No.1 of Host equipment of OTG function and connect
Mouth J1, No. two interface J2 for connecting charger, No. three interface J3 for connecting the external equipment for needing OTG to power.
No.1 interface J1 is access to the USB interface of the Host equipment with OTG function, such as mobile phone, tablet computer etc.；Two
Number interface J2 is access to the USB interface of charger；No. three interface J3 are used to connect any external equipment for needing OTG to power,
Such as mobile hard disk, printer.
Three interfaces include four V (vcc), D+ (data+), D- (data-), G (gnd) pins, between identical pin
It is electrically connected to each other, wherein No.1 interface J1 (J1) is additionally provided with pin S (Sense).
Data are transmitted by D+, D- pin between No.1 interface J1 and No. three interface J3, are powered by V pin；No. two connect
It is powered between J2 and No. three interface J3 of mouth by V pin.
The CMOS chip U1 includes the port E, Y-port, the port Z, and the port E is electrically connected with No. two interface J2, and the port Z connects
Ground, Y-port are electrically connected with No.1 interface J1.
The Y-port of CMOS chip U1 is electrically connected with S pin, for controlling between S pin and G pin in No.1 interface J1
On-off.Mobile phone etc. supports the smart machine of OTG supplying power for outside to pass through the on-off judged at itself USB interface between S and G pin
To decide whether supplying power for outside.Start to power if S and G is connected, stops powering if S and G open circuit.
Using CMOS chip U1 as core devices come automatic identification and control OTG and charge mode switching, it is small in size,
At low cost, power consumption almost can be ignored, long service life, and cost performance is high, is easy integration, is conducive to be mass produced.Nothing
It needs to be manually operated, controls program without increasing MCU device and writing complicated MCU.
In the present embodiment, a capacitor C1, one end ground connection of capacitor C1, the other end and No.1 are connected on CMOS chip U1
The V pin of interface J1 is electrically connected.
Capacitor C1 is for (being transformed into this period between OTG power supply from external charge) to CMOS chip U1 in a short time
It is powered, to guarantee that CMOS chip U1 can be not only without external power supply, but also without this in the case where OTG power supply
Continue to work normally in time.
In the present embodiment, connects and be provided in the circuit between the V pin of No.1 interface J1, the V pin of No. two interface J2
Diode D1.The port E of CMOS chip U1 cannot be flowed to from OTG Host equipment for limiting current direction, thus to electric current side
To being limited, accidentally the end E will not be drawn high because OTG powers.
The rate-determining steps of the present embodiment are as follows:
(1) when using this module for the first time, first No.1 interface J1 (J1) is connected on the host with OTG function, at this time
Have not been entered into OTG power supply state；
(2) charger is connected to No. two interface J2 (J2), charged to capacitor C1 (C1), and then allow CMOS chip U1
(U1) enter normal operating conditions；The enable end port E of CMOS chip U1 (U1) is raised at this time, and CMOS chip U1 (U1) is automatic
It disconnects, opens a way between Y-port and the port Z；
(3) charger is pulled out, the enable end E of CMOS chip U1 (U1) is pulled low, and CMOS chip U1 (U1) is by capacitor at this time
It powers in C1 (C1) short time and keeps normally being switched to closed state, be closed between Y-port and the port Z；At this moment host enters
OTG power supply state also carries out the external equipment of No. three interface J3 (J3) above in addition to starting to power to CMOS chip U1 (U1)
Power supply；At this point, the function of the limitation current direction due to diode D1 (D1), so that the OTG provided from No.1 interface J1 (J1)
Power supply will not maloperation the enable end port E of CMOS chip U1 (U1) is drawn high, so CMOS chip U1 (U1) can keep closing
Conjunction state, and then ensure that No.1 interface J1 (J1) is in OTG power supply state；
(4) as long as No.1 interface J1 (J1) was not turned off, CMOS chip U1 (U1) can be according to No. two interface J2
(J2) whether access charger and normally automatically switch OTG powering mode and charge data mode；
If No. two interface J2 (J2) connect charger, the enable end port E of CMOS chip U1 (U1) is raised, CMOS core
Piece U1 (U1) is disconnected automatically, is opened a way between Y-port and the port Z, and the host equipment of No.1 interface J1 (J1) connection stops externally supplying
Electricity, but host still carries out data transmission through No.1 interface J1 (J1), No. three interface J3 (J3) with external equipment；It is external at this time to set
It is standby to take electricity from charger through No. two interface J2 (J2), No. three interface J3 (J3)；Charger is to company, No.1 interface J1 (J1) institute simultaneously
The host connect charge；
If the connection of No. two interface J2 (J2) and charger disconnects, the enable end port E of CMOS chip U1 (U1) is drawn
Low, CMOS chip U1 (U1) is closed automatically, is shorted between Y-port and the port Z, and the host equipment of No.1 interface J1 (J1) connection is certainly
Dynamic to enter OTG power supply state, host powers to external equipment through No.1 interface J1 (J1), No. three interface J3 (J3) and carries out data
Transmission；
(5) if No.1 interface J1 (J1) was disconnected or No.1 interface J1 (J1) has a power failure completely, next time connects again
When tapping into row work, the step of repeating above-mentioned (1)~(3) is needed.
In addition, it should be noted that, done equivalent of all structure, feature and principles described according to the invention patent design or
Simple change is included in the scope of protection of the invention patent.
Claims (5)
1. a kind of OTG power supply, charging automatic switching module, it is characterised in that: it includes CMOS chip (U1), has for connecting
The No.1 interface (J1) of the Host equipment of OTG function, No. two interfaces (J2) for connecting charger need OTG for connecting
No. three interfaces (J3) of the external equipment of power supply；
The CMOS chip (U1) includes the port E, Y-port, the port Z, and the port E is electrically connected with No. two interfaces (J2), and the port Z connects
Ground, Y-port are electrically connected with No.1 interface (J1).
2. OTG power supply according to claim 1, charging automatic switching module, it is characterised in that: three interfaces
(J1, J2, J3) includes tetra- pins of V, D+, D-, G, is electrically connected to each other between identical pin；Wherein No.1 interface (J1) is also set
It is equipped with pin S, the Y-port of CMOS chip (U1) is electrically connected with S pin.
3. OTG power supply according to claim 2, charging automatic switching module, it is characterised in that: the CMOS chip
(U1) capacitor (C1), one end ground connection of capacitor (C1) are connected on, the V pin of the other end and No.1 interface (J1) is electrically connected
It connects.
4. OTG power supply according to claim 3, charging automatic switching module, it is characterised in that: the connection No.1 interface
(J1) diode (D1) is provided in the circuit between V pin, No. two interface (J2) V pins.
5. the control method of a kind of OTG power supply according to claim 1 to 4, charging automatic switching module, feature
Be: its rate-determining steps are as follows:
(1) when using this module for the first time, first No.1 interface (J1) is connected on the host with OTG function, at this time not yet
Into OTG power supply state；
(2) charger is connected to No. two interfaces (J2), charged to capacitor (C1), and then it is normal to allow CMOS chip (U1) to enter
Working condition；The enable end port E of CMOS chip (U1) is raised at this time, and CMOS chip (U1) disconnects automatically, Y-port and the end Z
It opens a way between mouthful；
(3) pull out charger, the enable end E of CMOS chip (U1) is pulled low, at this time CMOS chip (U1) by capacitor (C1) in short-term
It is interior power supply and keep normally be switched to closed state, be closed between Y-port and the port Z；At this moment host enters OTG power supply shape
State is also powered the external equipment of No. three interfaces (J3) above in addition to starting to power to CMOS chip (U1)；At this point, by
In the function of the limitation current direction of diode (D1), so that will not maloperation handle from the OTG power supply that No.1 interface (J1) is provided
The enable end port E of CMOS chip (U1) is drawn high, so CMOS chip (U1) can be kept closed, and then ensure that No.1
Interface (J1) is in OTG power supply state；
(4) as long as No.1 interface (J1) was not turned off, whether CMOS chip (U1) can access according to No. two interfaces (J2)
Charger and normally automatically switch OTG powering mode and charge data mode；
If No. two interfaces (J2) connect charger, the enable end port E of CMOS chip (U1) is raised, and CMOS chip (U1) is certainly
Dynamic circuit breaker is opened, and is opened a way between Y-port and the port Z, and the host equipment of No.1 interface (J1) connection stops supplying power for outside, but host is still
Carry out data transmission through No.1 interface (J1), No. three interfaces (J3) with external equipment；At this time external equipment through No. two interfaces (J2),
No. three interfaces (J3) take electricity from charger；The host that charger connects No.1 interface (J1) simultaneously charges；
If the connection of No. two interfaces (J2) and charger disconnects, the enable end port E of CMOS chip (U1) is pulled low, CMOS core
Piece (U1) is closed automatically, is shorted between Y-port and the port Z, and the host equipment of No.1 interface (J1) connection is powered automatically into OTG
State, host are powered and are carried out data transmission to external equipment through No.1 interface (J1), No. three interfaces (J3)；
(5) it if No.1 interface (J1) disconnected or No.1 interface (J1) has a power failure completely, is again coupled to next time carry out work
When making, the step of repeating above-mentioned (1)~(3) is needed.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109918327A (en) * | 2019-03-27 | 2019-06-21 | 深圳传音通讯有限公司 | OTG reversely charging electric current improvement method and OTG mobile phone |
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