CN101853966B - USB charging method and device for handheld terminal - Google Patents
USB charging method and device for handheld terminal Download PDFInfo
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- CN101853966B CN101853966B CN2009100485919A CN200910048591A CN101853966B CN 101853966 B CN101853966 B CN 101853966B CN 2009100485919 A CN2009100485919 A CN 2009100485919A CN 200910048591 A CN200910048591 A CN 200910048591A CN 101853966 B CN101853966 B CN 101853966B
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The invention relate to a USB charging method and device for handheld terminal, which is used for leading the handheld terminal connected to a USB host to acquire charging current from the USB host. The method comprises the following steps: defining a USB device class in the handheld terminal; utilizing the USB device to perform enumeration of the handheld terminal; if the enumeration succeeds, entering the charging process to acquire a standard charging current, wherein the handheld terminal periodically initiates an awakening request to the USB host so as to avoid being hung in the chargingprocess; and if the enumeration fails, performing low-current charge. The invention can conveniently realize that products can acquire needed current from the USB port of a PC machine under the condition of conforming to the USB conventional rules, thus eliminating hardware damage due to overcurrent of the USB port of the PC machine because the terminal directly acquires the current from the PC machine without the enumeration, and the risk that the PC machine hangs all the USB ports caused by directly acquiring the current from the PC machine.
Description
Technical field
The present invention relates to the equipment charge based on USB port, relate in particular to a kind of personal computer and do not install in the situation of respective drive, handheld terminal is via charging method and the device of USB port.
Background technology
Stipulate according to USB 2.0 agreement 9.2.5.1 trifles: USB device should be limited in the power supply requirement amount one below the unit, until be configured.End the equipment of (hang-up), no matter whether configure, the bus power consumption should be dropped to the below the mark of USB 2.0 agreements the 7th chapter definition.Decide on the port power load capacity of receiving equipment, USB device can be drawn the electric weight that reaches 5 unit from VBUS after having configured.One of them power supply unit electric current is 100mA.
GB YD/T 1591-2006 regulation: charger for mobile phone transformer terminal interface recommend adoption USB A interface on the Chinese market.
Because the effect of above two protocol and standards has the manufacturer terminal of usb data transmission demand usually can adopt USB port as charging inlet on its product, supports to obtain charging current from the USB port of personal computer (being called for short afterwards PC).In transfer of data, manufacturer can define the USB device class of oneself, if the operating system of PC is not supported the driving of this USB class, according to the regulation of usb protocol, PC can limit the usb bus electric current.All kinds of like this hand held terminal units (for example mobile phone) will face the charging current deficiency in charging, even current sinking surpasses the situation of charging current.For this situation, currently mainly contain following two kinds of processing modes:
1) directly obtains own needed electric current from USB port;
2) in charging time, enumerates USB device (enumerate) and becomes the USB flash disk that can not operate, and enumerates at USB flash disk and can obtain from the USB port of PC oneself needed electric current after finishing.
The usb protocol regulation can not be finished in the situation that USB enumerates, and PC need to be to the output current limiting of USB port.But owing to reasons such as designed capacitys; part PC manufacturer only hangs up USB device when unsuccessful enumerating; and not to the USB port current limliting; in the case; the responsibility that the USB port output current is protected is just fallen with it the terminal, and terminal need to be at the current limitation that enumerate in the unsuccessful situation the USB input.Face all multi-risk Systems without enumerating directly to obtain above the 100mA electric current from pc port, its risk maximum following 2 points are arranged:
1, USB port overcurrent to the PC of USB port output current limiting may be caused, the USB port that does not have protection may be burnt in the time of serious;
2, the stricter PC of protective ratio also might with all USB port hang-up, affect the use of other USB device in the situation that detect the port overcurrent.
And, charge less than the 100mA charging current if adopt, may cause charging current less than the problem of current sinking.
Even terminal can be enumerated flow process by finishing equipment, direct USB port power taking from PC, but after the agreement official hour, PC also may close the power supply to equipment, may cause toward terminal and charge again, thus the useful life of reducing battery.
In addition, the scheme that the state in the time of directly with equipment charge is enumerated into USB flash disk also can cause bad sense organ to the user.
Summary of the invention
For this reason, the purpose of this invention is to provide a kind of USB charging method of handheld terminal, it can be in the situation that PC install respective drive, makes handheld terminal obtain charging current from the USB port such as the usb host of PC safely.
Another object of the present invention provides a kind of USB charging device of handheld terminal, and it can be in the situation that PC install respective drive, makes handheld terminal obtain charging current from the USB port such as the usb host of PC safely.
The present invention solves the problems of the technologies described above the USB charging method that the technical scheme that adopts is a kind of handheld terminal of proposition, with obtaining charging current so that be connected to the handheld terminal of a usb host from this usb host, the method may further comprise the steps: a. defines a USB device class at this handheld terminal, and utilizes this USB device class to carry out enumerating of this handheld terminal; If b. enumeration succeeds enters step c, if enumerate failure, then enter steps d; C. make this handheld terminal enter charging flow to obtain a standard charging current, wherein in this charging flow, this handheld terminal is periodically initiated wake request to this usb host and is suspended avoiding; And d. makes this handheld terminal carry out a trickle charge.
According to one embodiment of the invention, in above-mentioned charging flow, above-mentioned handheld terminal is ignored the transmission information request of above-mentioned usb host.
According to one embodiment of the invention, above-mentioned handheld terminal is in off-mode.
According to one embodiment of the invention, the above-mentioned formula of holding terminal is in open state.And in one embodiment, before above-mentioned steps a, also comprise a0: enumerate according to the equipment that the user selectes, if enumerate failure, then enter step a, if enumeration succeeds then enters step c.Wherein in step a0, described handheld terminal is not received within the scheduled time that SetConfig information namely is judged as and is enumerated failure.
According to one embodiment of the invention, above-mentioned USB device class comprises kind equipment, syncsort equipment or the storage class equipment of interrupting.
According to one embodiment of the invention, above-mentioned standard charging current is not more than 500 milliamperes.
According to one embodiment of the invention, above-mentioned trickle charge carries out the charging that electric current is not more than 100 milliamperes.
The present invention proposes a kind of USB charging device of handheld terminal in addition, comprising: device definition module, device enumeration module and charging module.This device definition module defines a USB device class in this handheld terminal.This device enumeration module utilizes this USB device class to carry out enumerating of this handheld terminal, and whether judgement enumerates successful.This charging module makes this handheld terminal carry out normalized current charging when enumeration succeeds, and between charge period, periodically initiate wake request avoiding handheld terminal to be suspended to this usb host, and when enumerating unsuccessfully, make this handheld terminal carry out a trickle charge.
According to one embodiment of the invention, above-mentioned device enumeration module is ignored the transmission information request of usb host in above-mentioned charging flow.
According to one embodiment of the invention, above-mentioned handheld terminal is in off-mode.
According to one embodiment of the invention, if above-mentioned handheld terminal is in open state, then described device enumeration module also comprises according to utilizing described USB device class to enumerate before, the equipment that utilizes the user to select is enumerated, and wherein receives that with handheld terminal SetConfig information is as the standard of judging enumeration succeeds within the scheduled time.
According to one embodiment of the invention, above-mentioned USB device class is for interrupting kind equipment, syncsort equipment or storage class equipment.
The present invention makes it compared with prior art owing to adopting above technical scheme, has following remarkable advantage:
1, do not change in the situation of existing portable equipment software architecture, can realize easily that by a newly-increased charging special equipment class product is meeting under the usb protocol defined terms from the required electric current of PC USB port acquisition;
2, eliminate terminal and directly obtain the risk that electric current may burn out the PC USB port from PC, and directly obtain electric current from PC and cause that PC hangs up the risk of all USB port;
3, USB device comes the requirement usb host not hang up self by the periodic wakeup request, thereby reaches the purpose that can always adopt the own required electric current that is not more than 500mA before charging is finished from the USB mouth of PC.
Description of drawings
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, below in conjunction with accompanying drawing the specific embodiment of the present invention is elaborated, wherein:
Fig. 1 illustrates according to an embodiment of the invention the USB charging device figure of the handheld terminal of seeing from the USB device angle.
Fig. 2 illustrates hand-hold type terminal charge flow chart under the off-mode of one embodiment of the invention.
Fig. 3 illustrates hand-hold type terminal charge flow chart under the open state of one embodiment of the invention.
Fig. 4 illustrates the charging flow under the large current charge pattern of one embodiment of the invention.
Embodiment
The basic thought of handheld terminal USB charging method of the present invention is the USB device class that one of definition is exclusively used in the USB charging, this equipment can be current main-stream PC (Personal Computer, personal computer) operating system is supported, when the USB port of using PC is charged, descriptor with this equipment reaches the legal purpose of finishing the enumeration process of USB device, and after enumeration succeeds from the legal charging current of obtaining the own needed 500mA of being not more than (based on USB 2.0 agreements regulation) of PC.
Consider the driving that USB Mass Storage equipment class (storage class equipment, i.e. USB flash disk on the ordinary meaning) generally arranged on the present PC.For reason easy to verify, can be in Mass Storage equipment class of handheld terminal (such as mobile phone) definition, the USB enumeration process when finishing accordingly terminal and utilizing the USB port charging of PC.Preferably, when using Mass Storage equipment class, reach the reason of user's sense organ for user data is maintained secrecy, can make the drive that does not occur USB flash disk on the PC.After USB device was enumerated and finished, PC can ask the filesystem information of memory device, and terminal can take to ignore the strategy of this request.According to the regulation of usb protocol, if PC did not receive the filesystem information of terminal in 1 minute, can attempt this equipment is hung up.Therefore, in charging process, terminal is necessary to send out wake request to PC before PC hangs up self, requires PC not want hanging up bus and reaches the power supply that does not limit equipment.
Because the defined USB device class of the present invention can be commonly PC and supports, so enumerate easily and succeed.In addition, for fear of the situation that failure occurs enumerating (as because the problem of bus causes enumerating unsuccessful), the present invention will charge according to the low current mode that is not more than 100mA.
Need to prove the handheld terminal of method tenaculum storage card of the present invention.When terminal selects only to use USB port as charging inlet, from the angle of protection user information safety and user's impression, be preferably finish enumerate after, and PC do not carry out data interaction, is preferably in not occur any information on the PC.If the user needs terminal as storage class equipment, can select voluntarily device type, initiate once new device enumeration process by terminal.
In addition, when terminal only adopted USB interface as charging inlet, the equipment class that is similar to USB flash disk was the option of a more convenient realization, but was not limited only to this equipment class.As an example, the present invention can also define in terminal and interrupt kind equipment, for example mouse, keyboard, perhaps syncsort equipment, for example microphone.In a word, the center requirement of selecting the USB device class is that one of structure can be the equipment of usb host identification, finishes enumerating of USB device under the prerequisite of observing the usb protocol regulation, reaches the legal purpose that obtains enough electric currents from usb host.
Fig. 1 illustrates according to an embodiment of the invention the USB charging device figure of the handheld terminal of seeing from the USB device angle.See terminal architecture from the angle of USB device, terminal 100 comprises that upper layer application layer 110 and USB drive layer 120.USB drives layer 120 and further comprises functional layer 122, mechanical floor 124 and interface layer 126.USB charging device of the present invention is to be disposed at USB to drive in the layer 120.The realization of interface layer 126 main definition usb protocol physical interfaces comprises the assembling of physical connection, packet etc., and configuration one wake module 131 provides the register interface that wakes usb host up to functional layer 122 in the interface layer 126.Configured the device definition module 132 that is used for the definition of equipment class, the device enumeration module 133 that is used for the realization of device enumeration in the mechanical floor 124, according to the configuration of functional layer 122, the kind that mechanical floor 124 decisions are enumerated.Device definition module 132 definition USB device classes, for instance, this USB device class can be the memory device class, such as USB flash disk, can also be to interrupt kind equipment, for example mouse, keyboard, perhaps syncsort equipment, for example microphone.Functional layer 122 disposes a charging module 134, and is main under the requirement of upper layer application layer 110, determines the actual functional capability of current USB device by control appliance layer 124, such as serving as data transmission set, charging device etc.In embodiment described in the invention, functional layer 122 is also by directly calling the wake module 131 that is positioned at interface layer 126, realize the periodic wakeup to usb host, thereby make usb host not hang up usb bus, reach the requirement that continues to obtain from the usb host end required charging current.
Below, embodiments of the invention provide the realization of the USB charging method of above-mentioned handheld terminal.Because have terminal closedown charging and start charging two states, the below is illustrated respectively for example.
Fig. 2 illustrates hand-hold type terminal charge flow chart under the off-mode of one embodiment of the invention.Insert the USB line and be connected to main frame (such as PC) when terminal is in off-mode, because the voltage of 5V being arranged on the usb bus Vbus, the interior general realization of chip of terminal this moment is the flow process (step S0) that can enter the start that powers on.In step S1, when the main frame inspection is the USB insertion, can enter step S2, according to charging device USB is configured.Otherwise, can enter step S6, carry out normal boot-strap flow process or shutdown, this depends on the specific implementation of terminal.Whether enter into step S3 after step S3, device enumeration module 133 adopts carries out enumerating of USB device according to the USB device class (hereinafter referred to as the USB charging device) of aforementioned requirements definition, and enumerate successful in step S4 judgement.When judging enumeration succeeds, USB device enters after the address attitude of usb protocol regulation, charging module 134 can make handheld terminal enter charging flow, obtain the standard charging current (step S5) that is not more than 500mA by USB Vbus, the process of charging flow A sees also hereinafter the description with reference to Fig. 4.And if because the problem of bus exists and enumerates unsuccessful problem, then charging module 134 can make handheld terminal carry out trickle charge, namely obtains electric current (step S7) according to the requirement that is not more than 100mA from usb bus.
Fig. 3 illustrates hand-hold type terminal charge flow chart under the open state of one embodiment of the invention.With reference to Fig. 1 and shown in Figure 3, after connecting main frame (such as PC) by the USB line under handheld terminal 100 open states (step S10), confirm currently have USB to connect (step S11) by upper layer application layer 110.At this moment, terminal allows user selection equipment class (such as USB flash disk) to enumerate.In step S12, device enumeration module 133 is enumerated according to User Defined equipment.According to the present embodiment, be different from conventional enumerate judgement be, in step S13, if receiving the Set Config message that main frame sends within the scheduled time (such as 500ms), handheld terminal thinks enumeration succeeds, device enumeration module 133 can report the message of enumeration succeeds to upper layer application layer 110 (step S17), and it is aforesaid User Defined equipment that the upper layer application layer arranges handheld terminal at the operation interface of terminal.Charging module 134 makes terminal enter charging flow afterwards, can obtain the standard charging current (step S18) that is not more than 500mA by USB Vbus.
Otherwise, handheld terminal can not receive Set Config message that main frame sends and then thinks and enumerate failure within the scheduled time (such as 500ms), device enumeration module 133 can report to be enumerated failure and drives interface this handheld terminal is set is the USB charging device receiving to call after enumerating failed message to upper layer application layer 110 (step S14) upper layer application layer 110, then initiates new enumeration process (step S15); If judge enumeration succeeds in step S16 device enumeration module 133, then report the message of enumeration succeeds to upper layer application layer (step S17) by success message, charging module 134 makes handheld terminal enter charging flow (step S18) afterwards, obtain the standard charging current that is not more than 500mA by USB Vbus, the process of charging flow A sees also hereinafter the description with reference to Fig. 4.If enumerate unsuccessful problem because the problem of bus exists, then terminal is carried out trickle charge in step S19, obtains electric current according to the requirement that is not more than 100mA from usb bus.
Fig. 4 illustrates the charging flow under the large current charge pattern of one embodiment of the invention.With reference to shown in Figure 4, in step S20, after USB device entered the address attitude of usb protocol regulation, handheld terminal namely can obtain the charging current that is not more than 500mA by USB Vbus.Judge in step S21 whether charging is finished, if do not finish, namely terminal keeps in the charging process.In charging process, handheld terminal (being specially device enumeration module 133) is ignored the transmission information request of usb host (such as PC).Typically, when adopting USB Mass Storage equipment class as the USB charging device, terminal is ignored the filesystem information of the request memory device that main frame sends, to avoid occurring at main frame the drive of USB flash disk.Because the usb protocol regulation, if certain hour does not have transfer of data, main frame will be hung up equipment to reduce the power consumption of equipment after the regular hour so.Therefore, handheld terminal 100 is periodically initiated wake request to usb host, requires usb host not hang up USB device.In an embodiment of the present invention, define a timer that is not more than 1 minute, such as adopting timer time-delay certain time interval T (such as 90ms), such as step S22.Then, in step S23, the charging module 134 that is positioned at functional layer by terminal calls the wake module 131 that is positioned at interface layer, sends wake request to usb host, and the notice usb host can not be hung up equipment.Return afterwards step S21.So periodically wake up, can reach the long-time purpose that continues charging.In step S24, finish if charge, then the charge closing module.
The flow process that the above provides is just as example embodiment.Certainly, different according to the demand of specific product, above-mentioned flow process can be changed according to demand.
In sum, the present invention just can realize that product is meeting under the usb protocol defined terms from the required electric current of PC USB port acquisition by defining a USB device that is exclusively used in the handheld terminal charging easily in the situation that do not change existing portable equipment software architecture.This scheme can be eliminated terminal and directly obtain the risk that electric current may burn out the PC USB port from PC, and eliminates directly and to obtain electric current from PC and cause that PC hangs up the risk of all USB port.In addition, this method can avoid transfer of data between main frame and terminal improving fail safe, and when employing USB flash disk pattern during as the USB charging device, the USB flash disk drive can not occur to avoid affecting user's impression on main frame.
Although the present invention discloses as above with preferred embodiment; so it is not to limit the present invention, any those skilled in the art, without departing from the spirit and scope of the present invention; when can doing a little modification and perfect, so protection scope of the present invention is when with being as the criterion that claims were defined.
Claims (9)
1. the USB charging method of a handheld terminal is used so that be connected to the handheld terminal of a usb host and is obtained charging current from this usb host, and the method may further comprise the steps:
A. in this handheld terminal, define a USB device class, and utilize this USB device class to carry out enumerating of this handheld terminal;
If b. enumeration succeeds enters step c, if enumerate failure, then enter steps d;
C. make this handheld terminal enter charging flow to obtain a standard charging current, wherein in this charging flow, this handheld terminal is periodically initiated wake request to this usb host and is suspended avoiding; And
D. make this handheld terminal carry out a trickle charge, described trickle charge carries out the charging that electric current is not more than 100 milliamperes.
2. the method for claim 1 is characterized in that, in this charging flow, described handheld terminal is ignored the transmission information request of described usb host.
3. the method for claim 1, it is characterized in that, also comprise a0 before the described step a: enumerate according to the equipment that the user selectes, if enumerate failure, then enter step a, if enumeration succeeds then enters step c, wherein handheld terminal is not received within the scheduled time that SetConfig information namely is judged as and is enumerated failure.
4. the method for claim 1 is characterized in that, described USB device class is for interrupting kind equipment, syncsort equipment or storage class equipment.
5. the method for claim 1 is characterized in that, described standard charging current is not more than 500 milliamperes.
6. the USB charging device of a handheld terminal is used so that be connected to the handheld terminal of a usb host and is obtained charging current from this usb host, and this USB charging device comprises:
The device definition module, definition one USB device class in this handheld terminal;
The device enumeration module utilizes this USB device class to carry out enumerating of this handheld terminal, and whether judgement enumerates successful;
Charging module, when enumeration succeeds, make this handheld terminal carry out normalized current charging, and between charge period, periodically initiate wake request to avoid handheld terminal to be suspended to this usb host, and when enumerating unsuccessfully, making this handheld terminal carry out a trickle charge, described trickle charge carries out the charging that electric current is not more than 100 milliamperes.
7. device as claimed in claim 6 is characterized in that, this device enumeration module is ignored the transmission information request of described usb host in this charging flow.
8. device as claimed in claim 6 is characterized in that, described handheld terminal is in off-mode.
9. device as claimed in claim 6, it is characterized in that, if described handheld terminal is in open state, then described device enumeration module also comprises according to utilizing described USB device class to enumerate before, the equipment that utilizes the user to select is enumerated, and wherein receives that with handheld terminal SetConfig information is as the standard of judging enumeration succeeds within the scheduled time.
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| CN2009100485919A CN101853966B (en) | 2009-03-31 | 2009-03-31 | USB charging method and device for handheld terminal |
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| CN2009100485919A CN101853966B (en) | 2009-03-31 | 2009-03-31 | USB charging method and device for handheld terminal |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102087639B (en) * | 2010-11-30 | 2015-05-20 | 中兴通讯股份有限公司 | Method for starting USB (Universal Serial Bus) state machine as well as terminal |
| CN102082871A (en) * | 2010-12-27 | 2011-06-01 | 上海华勤通讯技术有限公司 | Method for intelligently identifying T card by mobile phone |
| US8494585B2 (en) * | 2011-10-13 | 2013-07-23 | The Boeing Company | Portable communication devices with accessory functions and related methods |
| CN102868820A (en) | 2012-09-19 | 2013-01-09 | 中兴通讯股份有限公司 | Mobile terminal, primary data communication device and mobile terminal charging system and method |
| KR20140039657A (en) * | 2012-09-24 | 2014-04-02 | 삼성전자주식회사 | Host apparatus, user terminal apparatus, method for controlling charger and method for communication using the same of |
| CN103838341A (en) * | 2012-11-23 | 2014-06-04 | 昆达电脑科技(昆山)有限公司 | Current limiting device |
| EP3101768B1 (en) * | 2014-01-28 | 2021-05-26 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Power adapter and terminal |
| CN106874232B (en) * | 2015-12-14 | 2021-07-30 | 中兴通讯股份有限公司 | Charging method, device and terminal of Universal Serial Bus (USB) |
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| CN1574539A (en) * | 2003-05-27 | 2005-02-02 | 捷讯研究有限公司 | Method and apparatus for controlling the charging state in a mobile electronic device |
| US20070088967A1 (en) * | 2005-10-13 | 2007-04-19 | Runbo Fu | Apparatus and method to support USB enumeration of a bus powered handheld device |
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| CN1574539A (en) * | 2003-05-27 | 2005-02-02 | 捷讯研究有限公司 | Method and apparatus for controlling the charging state in a mobile electronic device |
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Application publication date: 20101006 Assignee: Shanghai Li Ke Semiconductor Technology Co., Ltd. Assignor: Leadcore Technology Co., Ltd. Contract record no.: 2018990000159 Denomination of invention: USB charging method and device for handheld terminal Granted publication date: 20131016 License type: Common License Record date: 20180615 |