CN102820639B - A kind of over-current protection method of mainboard USB interface - Google Patents
A kind of over-current protection method of mainboard USB interface Download PDFInfo
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- CN102820639B CN102820639B CN201210290710.3A CN201210290710A CN102820639B CN 102820639 B CN102820639 B CN 102820639B CN 201210290710 A CN201210290710 A CN 201210290710A CN 102820639 B CN102820639 B CN 102820639B
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Abstract
The present invention provides the over-current protection method of a kind of mainboard USB interface; comprise the following steps: during operating system; if the maximum that the USB device electric current of the USB interface inserted exceedes resettable fuse bears electric current, described resettable fuse fuses, and mainboard stops powering to USB device；USB controller detects USB device and crosses stream；Described USB controller gives a warning to described operating system by BIOS, thus informs the USB device overcurrent that user inserts；If user pulled out the USB device of stream, recovery is powered by described resettable fuse to USB device, and USB controller will detect high level simultaneously, and BIOS stops reporting to the police to described operating system, and described operating system is restored to normal condition.The present invention can real-time guard mainboard USB interface cross stream and and alarm, find unstable factor in time, it is ensured that mainboard and security of system, stability.
Description
Technical field
The present invention relates to a kind of guard method, be specifically related to the over-current protection method of a kind of mainboard USB interface.
Background technology
General-purpose serial bus USB (UniversalSerialBUS) is an external bus standard, for being connected and communicate with of specification computer and external equipment.It is to apply the interfacing in PC field.USB interface props up plug and play and the warm connection function of holding equipment.USB will be combined proposition in the end of the year 1994 by Intel, Compaq, IBM, Microsoft Deng Duo company.
Along with popularizing of USB device, PC or server are ubiquitous to the dependence of USB device.On market, USB device quality is uneven, and protection PC mainboard or server master board are not damaged extremely important by USB device, and mainboard USB interface overcurrent protection is its core content.
The patent of invention of Application No. 201010557881.9 provides the current protecting circuit of a kind of USB interface; for electronic equipment, this USB interface plugs USB device, including back flow protection unit; have: control end, be electrically connected with the first running voltage of this electronic equipment；Input, is electrically connected with the second running voltage of this electronic equipment；And outfan, it is used for exporting this second running voltage；Wherein, in the presence of the first running voltage, the input of back flow protection unit electrically conducts with outfan, and this electronic equipment is powered to this USB device；When the first running voltage not in the presence of, the input of back flow protection unit electrically isolates with outfan, this electronic equipment stop power to this USB device.Without reference to alarm and protection problem in this invention, using to user and cause puzzlement, this invention can play a protective role and let the user know that the unavailable reason of USB device simultaneously.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the present invention provides the over-current protection method of a kind of mainboard USB interface, it is possible to real-time guard mainboard USB interface is crossed and flowed also and alarm, finds unstable factor in time, it is ensured that mainboard and security of system, stability.
In order to realize foregoing invention purpose, the present invention adopts the following technical scheme that:
The over-current protection method of a kind of mainboard USB interface, said method comprising the steps of:
Step 1: during operating system, if the maximum that the USB device electric current of the USB interface inserted exceedes resettable fuse bears electric current, described resettable fuse fuses, and mainboard stops powering to USB device；
Step 2:USB controller detects low level by detecting pin, and USB device crosses stream；
Step 3: described USB controller gives a warning to described operating system by BIOS, thus informs the USB device overcurrent that user inserts；
Step 4: if user pulled out the USB device of stream, recovery is powered by described resettable fuse to USB device, the pin of USB controller detecting simultaneously will detect high level, and BIOS stops reporting to the police to described operating system, and described operating system is restored to normal condition.
In described step 1, described USB device inserts USB interface, and it is carried out data transmission with described USB controller by USB differential signal.
In described step 2, described USB controller crosses stream by Pinoc0_N_GPIO59 signal detection to USB device.
In described step 3, the USB device overcurrent that user inserts is informed in the power supply restriction that described USB controller has exceeded its hub port by prompting USBMassStorageDevice.
Described operating system is operating system or the operating system of server of PC.
Compared with prior art; the beneficial effects of the present invention is: the over-current protection method of the mainboard USB interface that the present invention provides; can real-time guard mainboard USB interface cross stream and and alarm; find unstable factor in time; ensure mainboard and security of system; stability, and the method is simple and reliable, easily performs.
Accompanying drawing explanation
Fig. 1 is USB connection diagram in mainboard；
Fig. 2 is USB controller and USB interface circuit connection diagram.
Detailed description of the invention
Below in conjunction with the accompanying drawings the present invention is described in further detail.
Such as Fig. 1 and Fig. 2, the over-current protection method of a kind of mainboard USB interface, said method comprising the steps of:
Step 1: during operating system, if the maximum that the USB device electric current of the USB interface inserted exceedes resettable fuse FS1 bears electric current, described resettable fuse FS1 fuses, and mainboard stops powering to USB device；
Step 2: after resettable fuse FS1 fusing, R1, R2 do not have voltage to carry out dividing potential drop, are equivalent to USB controller Pinoc0_N_GPIO59 by resistance R2 ground connection, the most described USB controller to low level by Pinoc0_N_GPIO59 signal detection, is i.e. understood USB device and crosses stream；
Step 3: described USB controller gives a warning to described operating system by BIOS, thus informs the USB device overcurrent that user inserts；
Step 4: if user pulled out the USB device of stream, recovery is powered by described resettable fuse to USB device, USB controller will detect high level simultaneously, basic input-output system BIOS (BasicInputOutputSystem) stops reporting to the police to described operating system, and described operating system is restored to normal condition.
In described step 1, described USB device inserts USB interface, and it is carried out data transmission with described USB controller by USB differential signal.
In described step 3, the USB device overcurrent that user inserts is informed in the power supply restriction that described USB controller has exceeded its hub port by prompting USBMassStorageDevice.
Described operating system is operating system or the operating system of server of PC.
In sum, the over-current protection method of the mainboard USB interface that the present invention provides, the method is simple and reliable, easily performs, it is possible to real-time guard mainboard USB interface is crossed and flowed also and alarm, finds unstable factor in time, it is ensured that mainboard and security of system, stability.
Finally should be noted that: above example is only in order to illustrate that technical scheme is not intended to limit, although the present invention being described in detail with reference to above-described embodiment, those of ordinary skill in the field are it is understood that still can modify or equivalent to the detailed description of the invention of the present invention, and without departing from any amendment of spirit and scope of the invention or equivalent, it all should be contained in the middle of scope of the presently claimed invention.
Claims (5)
1. the over-current protection method of a mainboard USB interface, it is characterised in that: said method comprising the steps of:
Step 1: during operating system, if the maximum that the USB device electric current of the USB interface inserted exceedes resettable fuse bears electric current, described resettable fuse fuses, and mainboard stops powering to USB device；
Step 2:USB controller detects low level by detecting pin, and USB device crosses stream；
Step 3: described USB controller gives a warning to described operating system by BIOS, thus informs the USB device overcurrent that user inserts；
Step 4: if user pulled out the USB device of stream, recovery is powered by described resettable fuse to USB device, the pin of USB controller detecting simultaneously will detect high level, and BIOS stops reporting to the police to described operating system, and described operating system is restored to normal condition.
The over-current protection method of mainboard USB interface the most according to claim 1, it is characterised in that: in described step 1, described USB device inserts USB interface, and it is carried out data transmission with described USB controller by USB differential signal.
The over-current protection method of mainboard USB interface the most according to claim 1, it is characterised in that: in described step 2, described USB controller detects USB device by pin oc0_N_GPIO59 and crosses stream.
The over-current protection method of mainboard USB interface the most according to claim 1; it is characterized in that: in described step 3, the USB device overcurrent that user inserts is informed in the power supply restriction that described USB controller has exceeded its hub port by prompting USB mass memory unit.
The over-current protection method of mainboard USB interface the most according to claim 1, it is characterised in that: described operating system is operating system or the operating system of server of PC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210290710.3A CN102820639B (en) | 2012-08-15 | 2012-08-15 | A kind of over-current protection method of mainboard USB interface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201210290710.3A CN102820639B (en) | 2012-08-15 | 2012-08-15 | A kind of over-current protection method of mainboard USB interface |
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| Publication Number | Publication Date |
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| CN102820639A CN102820639A (en) | 2012-12-12 |
| CN102820639B true CN102820639B (en) | 2016-08-03 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10579118B2 (en) | 2016-01-06 | 2020-03-03 | Hewlett-Packard Development Company, L.P. | Detection circuits |
| US11334132B2 (en) | 2018-04-18 | 2022-05-17 | Hewlett-Packard Development Company, L.P. | Power selection for PUSB ports |
| CN108879589B (en) * | 2018-05-31 | 2020-09-18 | Oppo（重庆）智能科技有限公司 | Overcurrent protection method and device, terminal equipment and storage medium |
| CN111224657A (en) * | 2019-12-25 | 2020-06-02 | 曙光信息产业(北京)有限公司 | Power supply switching circuit of computer USB port |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200953123Y (en) * | 2006-09-27 | 2007-09-26 | 揭雪强 | USB interface protection circuit |
| CN201708515U (en) * | 2010-06-08 | 2011-01-12 | 深圳Tcl新技术有限公司 | Power protection circuit |
| CN201947167U (en) * | 2011-02-18 | 2011-08-24 | 深圳精美精科技有限公司 | USB (universal serial bus) power supply circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080005415A1 (en) * | 2006-06-06 | 2008-01-03 | Lopez Fernando A | Disabling a Universal Serial Bus Port |
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- 2012-08-15 CN CN201210290710.3A patent/CN102820639B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200953123Y (en) * | 2006-09-27 | 2007-09-26 | 揭雪强 | USB interface protection circuit |
| CN201708515U (en) * | 2010-06-08 | 2011-01-12 | 深圳Tcl新技术有限公司 | Power protection circuit |
| CN201947167U (en) * | 2011-02-18 | 2011-08-24 | 深圳精美精科技有限公司 | USB (universal serial bus) power supply circuit |
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| CN102820639A (en) | 2012-12-12 |
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Effective date of registration: 20200426 Address after: 100193 335, floor 3, building 25, yard 8, Dongbei Wangxi Road, Haidian District, Beijing Patentee after: Ningchang information industry (Beijing) Co., Ltd Address before: 100193 No. 36, Zhongguancun Software Park, No. 8 northeast Wang Xi Road, Beijing, Haidian District Patentee before: Dawning Information Industry (Beijing) Co.,Ltd. |
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