CN104714916A - Detection system for plugging or unplugging of external equipment on USB interface - Google Patents
Detection system for plugging or unplugging of external equipment on USB interface Download PDFInfo
- Publication number
- CN104714916A CN104714916A CN201510144115.2A CN201510144115A CN104714916A CN 104714916 A CN104714916 A CN 104714916A CN 201510144115 A CN201510144115 A CN 201510144115A CN 104714916 A CN104714916 A CN 104714916A
- Authority
- CN
- China
- Prior art keywords
- divider resistance
- usb interface
- resistance
- power supply
- detection system
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Power Sources (AREA)
Abstract
The invention relates to an electronic and communication equipment technology. In order to solve the problems of more complex implementation and higher cost in the existing technology for detecting plugging or unplugging of external equipment on a USB interface, the invention provides a detection system for plugging or unplugging of the external equipment on the USB interface. The technical scheme can be summarized as follows: the detection system comprises a processor control unit, a Vbus controller, a +5V power input end, a filtering protection module I, the USB interface, a filtering and energy-storage capacitor I and a ground wire and also comprises a bypass auxiliary power supply and a judgment module which are respectively connected with the +5V power input end, the Vbus controller and the filtering and energy-storage capacitor I. The detection system provided by the invention has the beneficial effects that the Vbus controller can be protected, and the whole system is simple in structure and low in cost and is applicable to electronic and communication equipment supporting the USB communication interface.
Description
Technical field
The present invention relates to electronics and communication device technology, particularly support the electronics of usb communication interface and the technology of communication facilities.
Background technology
Current usb communication technology is very ripe, numerous electronic and communication facility obtains extensive popularization and application, nearly all household electrical appliance and specialized communication equipment are all designed with USB interface, for document backup or site equipment management, or the operation such as equipment working procedure upgrading.But, a slight deficiency is in standard usb interface, only define 2 data-signals (D+ and D-) and 2 power supply signals (Vbus and GND), there is no on defining interface the signal of whether external equipment (as: USB flash drive and USB are by charging equipment etc.), detect in real time whether to have external unit insertion or extract USB interface to USB-HOST like this and bring certain difficulty, method for designing comparatively general on current equipment is that the Power supply Vbus remained in USB interface connects, whether activity is had by D+ and the D-signal detected in USB-MAC/PHY module, to confirm whether USB interface inserts external unit, its system chart as shown in Figure 1, comprise processor control module, Vbus controller, + 5V power input, filtering protection module one, filtering protection module two, USB-MAC/PHY module, USB interface and filtering storage capacitor one C1, wherein, processor control module is connected with Vbus controller by the Enable port of himself, + 5V power input is connected with Vbus controller, the output terminal of Vbus controller is connected with the Vbus port of USB interface by filtering protection module one, the output terminal of Vbus controller is connected with ground wire by filtering storage capacitor C, ground wire is connected with the GND port of USB interface by filtering protection module one, the D+ port of USB interface and D-port are respectively by filtering protection module two and USB-MAC/PHY model calling, USB-MAC/PHY module and processor control module connecting communication.The method also had is a small area analysis detection resistance of contacting on the GND signal of USB interface, for confirming whether USB interface inserts external unit, all these methods all need Vbus to keep conducting always, the hot plug of external USB equipment can cause the damage of inner Vbus control device, makes USB interface unavailable.As can be seen here, USB interface is applied non-ordinary light and is put, but owing to not defining external unit whether signal special in place in its interface standard, managing the external unit that USB interface connects to USB-HOST makes troubles.Although there are a lot of equipment vendors to propose for patented technology USB interface detecting external unit insertion or extract, it is more complicated still to there is enforcement in it, the deficiency of high expensive.
Summary of the invention
Object of the present invention is exactly overcome at present to implement more complicated for USB interface detecting the technology that external unit inserts or extract, and the shortcoming of high expensive, provides a kind of USB interface external unit to insert/transfer to detection system.
The present invention solves its technical matters; the technical scheme adopted is; USB interface external unit inserts/transfers to detection system; comprise processor control module, Vbus controller ,+5V power input, filtering protection module one, USB interface, filtering storage capacitor one and ground wire; it is characterized in that; also comprise respectively with+5V power input, Vbus controller, filtering protection module one and bypass accessory power supply and judge module
Whether described processor control module is opened according to the output control Vbus controller of bypass accessory power supply and judge module;
Described bypass accessory power supply and judge module can directly by filtering protection module one for USB interface is powered; and the electric current of this power supply is lower than the normalized current of USB interface; according to the magnitude of voltage on filtering storage capacitor one, bypass accessory power supply and judge module have judged whether that external unit accesses, and inform processor control module.
Concrete, described bypass accessory power supply and judge module can directly by filtering protection module one for the power supply current value that USB interface is powered is not more than 1/10th of the standard current value of USB interface.
Concrete, described bypass accessory power supply and judge module comprise filtering storage capacitor two, divider resistance one, divider resistance two, divider resistance three, divider resistance four, divider resistance five and voltage comparator, one end of divider resistance one is connected with+5V power input, the other end is connected with the output terminal of Vbus controller, and be connected with one end of divider resistance two, the other end of divider resistance two is connected with one end of divider resistance three, and be connected with the input end one of voltage comparator, the other end of divider resistance three is connected with ground wire, one end of divider resistance four is connected with+5V power input, the other end is connected with one end of divider resistance five, and be connected with the input end two of voltage comparator, the other end of divider resistance five is connected with ground wire, the output terminal of voltage comparator is connected with processor control module.
Further, the input end one of described voltage comparator is normal phase input end, and input end two is negative-phase input; Or the input end one of described voltage comparator is negative-phase input, and input end two is normal phase input end.
Further, the value of the resistance of described divider resistance one electric current that bypass accessory power supply and judge module can be made to power is lower than the normalized current of USB interface.
Concrete, described divider resistance two and the resistance summation of divider resistance three are at least greater than 10 times of the resistance of divider resistance one.
Further, the resistance of described divider resistance three is less than or equal to the resistance sum of divider resistance one and divider resistance two.
Concrete, the resistance of described divider resistance four is greater than the resistance of divider resistance five, and meets following formula:
Wherein, R4 is the resistance of divider resistance four, and R5 is the resistance of divider resistance five, and R1 is the resistance of divider resistance one, and R2 is the resistance of divider resistance two, and R3 is the resistance of divider resistance three.
Further, described bypass accessory power supply and judge module also comprise filtering storage capacitor two, and described+5V power input is connected with ground wire by filtering storage capacitor two.
Concrete, the capacitance of filtering storage capacitor one is not more than 10 μ F.
The invention has the beneficial effects as follows; insert/transfer to detection system by above-mentioned USB interface external unit; the bypass accessory power supply increased and judge module can judge by the magnitude of voltage on filtering storage capacitor one that whether USB interface existing external unit inserts or extract event; and due to bypass accessory power supply power time without Vbus controller; thus can when inserting without external unit; close the output of Vbus controller; form the protection to Vbus controller; and whole system structure is simple, with low cost.
Accompanying drawing explanation
Fig. 1 is the system chart of usb interface system in prior art.
Fig. 2 is the system chart that in the embodiment of the present invention, USB interface external unit inserted/transferred to detection system.
Wherein, C1 is filtering storage capacitor one, C2 is filtering storage capacitor two, D+ is the D+ port of USB interface, and D-is the D-port of USB interface, and R1 is divider resistance one, R2 is divider resistance two, R3 is divider resistance three, R4 be divider resistance four, R5 is divider resistance five, J1 is voltage comparator, V1 is divider node one, V2 be divider node two, Vbus is divider node three.
Embodiment
Below in conjunction with embodiment and accompanying drawing, describe technical scheme of the present invention in detail.
USB interface external unit of the present invention inserts/transfers to detection system and comprises processor control module, Vbus controller, + 5V power input, filtering protection module one, USB interface, filtering storage capacitor one C1 and ground wire etc., with usb interface system in prior art unlike: also comprise respectively with+5V power input, Vbus controller, the bypass accessory power supply that filtering protection module one and ground wire are connected and judge module, wherein, whether processor control module is opened according to the output control Vbus controller of bypass accessory power supply and judge module, bypass accessory power supply and judge module can directly by filtering protection module one for USB interface is powered, and the electric current of this power supply is lower than the normalized current of USB interface, according to the magnitude of voltage on filtering storage capacitor one, bypass accessory power supply and judge module have judged whether that external unit accesses, and inform processor control module, and as D-port, D+ port, filtering protection module two and USB-MAC/PHY module are because with the bypass accessory power supply in the present invention and judge module without direct connection relational, therefore do not illustrate herein.
Embodiment
In the embodiment of the present invention, USB interface external unit inserts/transfers to detection system and comprises processor control module, Vbus controller, + 5V power input, filtering protection module one, USB interface, filtering storage capacitor one C1 and ground wire, with usb interface system in prior art unlike: also comprise respectively with+5V power input, Vbus controller, filtering protection module one and bypass accessory power supply and judge module, wherein, whether processor control module is opened according to the output control Vbus controller of bypass accessory power supply and judge module, bypass accessory power supply and judge module can directly by filtering protection module one for USB interface is powered, and the electric current of this power supply is lower than the normalized current of USB interface, according to the magnitude of voltage on filtering storage capacitor one, bypass accessory power supply and judge module have judged whether that external unit accesses, and inform processor control module.Described bypass accessory power supply and judge module can directly by filtering protection module one for the power supply current value that USB interface is powered is not more than 1/10th of the standard current value of USB interface.
In the present embodiment, USB interface external unit inserts/transfers to the system chart of detection system as shown in Figure 2, which proposes the connection mode of a kind of concrete bypass accessory power supply and judge module, is specifically described below to it:
This bypass accessory power supply and judge module comprise filtering storage capacitor two C2, divider resistance one R1, divider resistance two R2, divider resistance three R3, divider resistance four R4, divider resistance five R5 and voltage comparator J1, one end of divider resistance one R1 is connected with+5V power input, the other end is connected with the output terminal of Vbus controller, and be connected with one end of divider resistance two R2, the other end of divider resistance two R2 is connected with one end of divider resistance three R3, and be connected with the input end one of voltage comparator J1, the other end of divider resistance three R3 is connected with ground wire, one end of divider resistance four R4 is connected with+5V power input, the other end is connected with one end of divider resistance five R5, and be connected with the input end two of voltage comparator J1, the other end of divider resistance five R5 is connected with ground wire, the output terminal of voltage comparator J1 is connected with processor control module.
In this example, the input end one of voltage comparator J1 can be normal phase input end, and input end two is negative-phase input; Input end one can be also negative-phase input, and input end two is normal phase input end.
In this example, for convenience of describing, the point that the output terminal of divider resistance one R1 and Vbus controller connects is set as divider node three Vbus, that one end that divider resistance two R2 is connected with divider resistance three R3 is set as divider node one V1, that one end that divider resistance four R4 is connected with divider resistance five R5 is set as divider node two V2.
And the electric current that the value of the resistance of divider resistance one R1 can make bypass accessory power supply and judge module power is far below the normalized current of USB interface, the power supply current value as powered for USB interface is not more than 1/10th of the standard current value of USB interface.Namely the resistance of divider resistance R1 can not be too little, and should be larger, such as, be chosen as 51K Ω in this example, the electric current (when namely Vbus controller cuts out its output) that its object is to make bypass accessory power supply and judge module power is far below the minimum working current (general several milliamperes) required for the external unit be connected with USB interface, external unit can not be made normally to work, therefore the working current of divider resistance one should in tens to one hundred many microamperes of scopes, then according to the 51K Ω selected in this example, its maximum operating currenbt=5V/51K Ω=98 microampere.
In order to make divider node three Vbus place voltage in USB interface specialized range, therefore the resistance summation of divider resistance two R2 and divider resistance three R3 must be greater than at least 10 times of the resistance of divider resistance one R1, according to 12 times of calculating in this example, so the resistance summation of divider resistance two R2 and divider resistance three R3 is at least greater than 51K Ω × 12=612K Ω.
And in order to make the voltage of divider node one V1 and divider node two V2 have larger voltage difference, the resistance being then preferably divider resistance three R3 is less than or equal to the resistance sum of divider resistance one R1 and divider resistance two R2, the magnitude of voltage getting divider node one V1 in this example is maximum 2.5V, so now the resistance of divider resistance two R2 is 449K Ω, and the resistance of divider resistance three R3 is 500K Ω, like this when after filtering storage capacitor C1 charging complete, magnitude of voltage=5 × (449+500)/(51+449+500) V=4.75V of divider node three Vbus, meet USB interface specification, and magnitude of voltage=4.75 × 500/ (the 449+500)=2.5V of divider node one V1.Meanwhile, for ensureing voltage comparator J1 can detect whether have external unit to access this USB interface, then need the resistance of divider resistance four R4 to be greater than the resistance of divider resistance five R5, and meet following formula:
Now, R4 is the resistance of divider resistance four, and R5 is the resistance of divider resistance five, and R1 is the resistance of divider resistance one, and R2 is the resistance of divider resistance two, and R3 is the resistance of divider resistance three.Thus, then when after filtering storage capacitor C1 charging complete, the magnitude of voltage of divider node one V1 just must be greater than the resistance value of divider node two V2.Defining divider node two V2 in this example is 1.25V, then require that the resistance of divider resistance four R4 is 3 times of the resistance of divider resistance five R5, in this example, and the resistance selecting divider resistance four R4 is 300K Ω, then the resistance of divider resistance five R5 is 100K Ω.
Need owing to detecting again, the capacitance of filtering storage capacitor one C1 should not be too large, thus, filtering storage capacitor two C2 can be increased, order+5V power input is connected with ground wire by filtering storage capacitor two C2, utilize filtering storage capacitor one C1 to coordinate when USB external equipment works with filtering storage capacitor two C2, the filtering requirements on Vbus power bus, the capacitance of filtering storage capacitor one C1 is preferably 10 μ F.
With above-mentioned specifically lifted each component values, concrete testing process is described below: during beginning, processor control module is in closed condition by Enable port controlling Vbus controller, and bypass accessory power supply and judge module are energized and be that USB interface is powered always, if now without external equipment access USB interface, filtering storage capacitor one C1 is in charged state, when after its charging complete, now the magnitude of voltage of divider node one V1 is 2.5V, be greater than the magnitude of voltage 1.25V of divider node two V2, then now voltage comparator J1 exports a level signal (for high level in this example, when the normal phase input end voltage of input end one, when being greater than the negative-phase input voltage of input end two, it is now high level, when the normal phase input end voltage of input end one, when being less than the negative-phase input voltage of input end two, be now low level), represent and current USB interface does not connect external equipment, processor control module recognizes this signal (high level) that current voltage comparer J1 exports, and still control Vbus controller is in closed condition.If now there is external equipment to access USB interface, then can consume rapidly the electric charge on filtering storage capacitor one C1, the working current of divider resistance one R1 is far not enough to again this external equipment is normally worked simultaneously, now because the filtering storage capacitor one C1 velocity of discharge is much larger than its charging rate, the magnitude of voltage of divider node one V1 can quickly fall to close to 0V, then be significantly less than the magnitude of voltage 1.25V of divider node two V2, signal then now after voltage comparator J1 exporting change is (for low level in this example, the normal phase input end voltage of input end one, when being greater than the negative-phase input voltage of input end two, it is now high level, when the normal phase input end voltage of input end one, when being less than the negative-phase input voltage of input end two, be now low level), then processor control module recognizes the signal (low level) after the change that now voltage comparator exports, think that USB interface exists external unit access, opened by Enable port controlling Vbus controller, make Vbus controller by filtering protection module one to USB interface normal power supply, when now extracting external equipment again, owing to not having the signal of external unit, (this can by D-port as described in the background art, D+ port, filtering protection module two and USB-MAC/PHY module realize judging, also other existing modes can be adopted, therefore respective description is not carried out in this example, also do not carry out corresponding drafting in fig. 2) then processor control module by Enable port controlling Vbus controller close, USB interface is still only powered by bypass accessory power supply.
Claims (10)
1.USB interface external unit inserts/transfers to detection system; comprise processor control module, Vbus controller ,+5V power input, filtering protection module one, USB interface and filtering storage capacitor one; it is characterized in that; also comprise the bypass accessory power supply and judge module that are connected with+5V power input, Vbus controller, filtering protection module one respectively
Whether described processor control module is opened according to the output control Vbus controller of bypass accessory power supply and judge module;
Described bypass accessory power supply and judge module can directly by filtering protection module one for USB interface is powered; and the electric current of this power supply is lower than the normalized current of USB interface; according to the magnitude of voltage on filtering storage capacitor one, bypass accessory power supply and judge module have judged whether that external unit accesses, and inform processor control module.
2. USB interface external unit as claimed in claim 1 or 2 inserts/transfers to detection system; it is characterized in that, described bypass accessory power supply and judge module can directly by filtering protection module one for the power supply current value that USB interface is powered is not more than 1/10th of the standard current value of USB interface.
3. USB interface external unit as claimed in claim 1 or 2 inserts/transfers to detection system, it is characterized in that, described bypass accessory power supply and judge module comprise filtering storage capacitor two, divider resistance one, divider resistance two, divider resistance three, divider resistance four, divider resistance five and voltage comparator, one end of divider resistance one is connected with+5V power input, the other end is connected with the output terminal of Vbus controller, and be connected with one end of divider resistance two, the other end of divider resistance two is connected with one end of divider resistance three, and be connected with the input end one of voltage comparator, the other end of divider resistance three is connected with ground wire, one end of divider resistance four is connected with+5V power input, the other end is connected with one end of divider resistance five, and be connected with the input end two of voltage comparator, the other end of divider resistance five is connected with ground wire, the output terminal of voltage comparator is connected with processor control module.
4. USB interface external unit as claimed in claim 3 inserts/transfers to detection system, and it is characterized in that, the input end one of described voltage comparator is normal phase input end, and input end two is negative-phase input; Or the input end one of described voltage comparator is negative-phase input, and input end two is normal phase input end.
5. USB interface external unit as claimed in claim 3 inserts/transfers to detection system, it is characterized in that, the electric current that the value of the resistance of described divider resistance one can make bypass accessory power supply and judge module power is lower than the normalized current of USB interface.
6. USB interface external unit as claimed in claim 3 inserts/transfers to detection system, it is characterized in that, described divider resistance two and the resistance summation of divider resistance three are at least greater than 10 times of the resistance of divider resistance one.
7. USB interface external unit as claimed in claim 6 inserts/transfers to detection system, it is characterized in that, the resistance of described divider resistance three is less than or equal to the resistance sum of divider resistance one and divider resistance two.
8. USB interface external unit as claimed in claim 3 inserts/transfers to detection system, and it is characterized in that, the resistance of described divider resistance four is greater than the resistance of divider resistance five, and meets following formula:
Wherein, R4 is the resistance of divider resistance four, and R5 is the resistance of divider resistance five, and R1 is the resistance of divider resistance one, and R2 is the resistance of divider resistance two, and R3 is the resistance of divider resistance three.
9. the USB interface external unit as described in any one of claim 3-7 inserts/transfers to detection system, it is characterized in that, described bypass accessory power supply and judge module also comprise filtering storage capacitor two, and described+5V power input is connected with ground wire by filtering storage capacitor two.
10. USB interface external unit as claimed in claim 9 inserts/transfers to detection system, and it is characterized in that, the capacitance of filtering storage capacitor one is not more than 10 μ F.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510144115.2A CN104714916B (en) | 2015-03-30 | 2015-03-30 | USB interface external equipment inserts/transfer to detecting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510144115.2A CN104714916B (en) | 2015-03-30 | 2015-03-30 | USB interface external equipment inserts/transfer to detecting system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104714916A true CN104714916A (en) | 2015-06-17 |
| CN104714916B CN104714916B (en) | 2017-11-17 |
Family
ID=53414265
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510144115.2A Active CN104714916B (en) | 2015-03-30 | 2015-03-30 | USB interface external equipment inserts/transfer to detecting system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104714916B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105301386A (en) * | 2015-09-23 | 2016-02-03 | 广东欧珀移动通信有限公司 | OTG detection circuit and mobile terminal with OTG detection circuit |
| CN107643995A (en) * | 2016-07-22 | 2018-01-30 | 炬芯（珠海）科技有限公司 | Judge the method, apparatus and USB system of USB device connection |
| CN111475448A (en) * | 2020-03-05 | 2020-07-31 | 成都娄外科技有限公司 | USB device insertion state detection method and device and USB device |
| CN112380080A (en) * | 2020-12-02 | 2021-02-19 | 深圳慧能泰半导体科技有限公司 | USB equipment detection system and method |
| CN114624633A (en) * | 2022-05-17 | 2022-06-14 | 陕西天视致远航空技术有限公司 | HDMI (high-definition multimedia interface) port plugging detection system and method, electronic equipment and storage medium |
| CN114624632A (en) * | 2022-05-17 | 2022-06-14 | 陕西天视致远航空技术有限公司 | USB port plug detection system, method, electronic equipment and storage medium |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1538306A (en) * | 2003-09-25 | 2004-10-20 | 联想(北京)有限公司 | Computer peripheral device and its working method |
| CN2711938Y (en) * | 2004-05-14 | 2005-07-20 | 万国电脑股份有限公司 | USB connector with detection signal device and its application system |
| JP2005332138A (en) * | 2004-05-19 | 2005-12-02 | Yaskawa Electric Corp | Universal serial bus (usb) command servo amplifier and its control method |
| CN1873603A (en) * | 2005-05-31 | 2006-12-06 | 凌阳科技股份有限公司 | Access device for computer storage equipment |
| CN1892521A (en) * | 2005-07-05 | 2007-01-10 | 宏达国际电子股份有限公司 | Connecting seat for portable electronic device |
| US20110043162A1 (en) * | 2009-08-19 | 2011-02-24 | Richtek Technology Corp. | Charger and portable device having the same |
| CN202145312U (en) * | 2011-07-29 | 2012-02-15 | 迈普通信技术股份有限公司 | Field configuration interface device of communication equipment and communication equipment |
| CN103064376A (en) * | 2012-12-19 | 2013-04-24 | 迈普通信技术股份有限公司 | Concentrated power supply rack-mounted equipment function module hot plug control system |
-
2015
- 2015-03-30 CN CN201510144115.2A patent/CN104714916B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1538306A (en) * | 2003-09-25 | 2004-10-20 | 联想(北京)有限公司 | Computer peripheral device and its working method |
| CN2711938Y (en) * | 2004-05-14 | 2005-07-20 | 万国电脑股份有限公司 | USB connector with detection signal device and its application system |
| JP2005332138A (en) * | 2004-05-19 | 2005-12-02 | Yaskawa Electric Corp | Universal serial bus (usb) command servo amplifier and its control method |
| CN1873603A (en) * | 2005-05-31 | 2006-12-06 | 凌阳科技股份有限公司 | Access device for computer storage equipment |
| CN1892521A (en) * | 2005-07-05 | 2007-01-10 | 宏达国际电子股份有限公司 | Connecting seat for portable electronic device |
| US20110043162A1 (en) * | 2009-08-19 | 2011-02-24 | Richtek Technology Corp. | Charger and portable device having the same |
| CN202145312U (en) * | 2011-07-29 | 2012-02-15 | 迈普通信技术股份有限公司 | Field configuration interface device of communication equipment and communication equipment |
| CN103064376A (en) * | 2012-12-19 | 2013-04-24 | 迈普通信技术股份有限公司 | Concentrated power supply rack-mounted equipment function module hot plug control system |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105301386A (en) * | 2015-09-23 | 2016-02-03 | 广东欧珀移动通信有限公司 | OTG detection circuit and mobile terminal with OTG detection circuit |
| CN107643995A (en) * | 2016-07-22 | 2018-01-30 | 炬芯（珠海）科技有限公司 | Judge the method, apparatus and USB system of USB device connection |
| CN107643995B (en) * | 2016-07-22 | 2020-05-19 | 炬芯（珠海）科技有限公司 | Method and device for judging USB equipment connection and USB system |
| CN111475448A (en) * | 2020-03-05 | 2020-07-31 | 成都娄外科技有限公司 | USB device insertion state detection method and device and USB device |
| CN111475448B (en) * | 2020-03-05 | 2023-04-07 | 成都娄外科技有限公司 | USB device insertion state detection method and device and USB device |
| CN112380080A (en) * | 2020-12-02 | 2021-02-19 | 深圳慧能泰半导体科技有限公司 | USB equipment detection system and method |
| CN112380080B (en) * | 2020-12-02 | 2021-06-08 | 深圳慧能泰半导体科技有限公司 | USB equipment detection system and method |
| WO2022116370A1 (en) * | 2020-12-02 | 2022-06-09 | 深圳慧能泰半导体科技有限公司 | Usb device detection system and method |
| CN114624633A (en) * | 2022-05-17 | 2022-06-14 | 陕西天视致远航空技术有限公司 | HDMI (high-definition multimedia interface) port plugging detection system and method, electronic equipment and storage medium |
| CN114624632A (en) * | 2022-05-17 | 2022-06-14 | 陕西天视致远航空技术有限公司 | USB port plug detection system, method, electronic equipment and storage medium |
| CN114624632B (en) * | 2022-05-17 | 2022-09-30 | 陕西天视致远航空技术有限公司 | USB port plug detection system, method, electronic equipment and storage medium |
| CN114624633B (en) * | 2022-05-17 | 2022-09-30 | 陕西天视致远航空技术有限公司 | HDMI (high-definition multimedia interface) port plugging detection system and method, electronic equipment and storage medium |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104714916B (en) | 2017-11-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104714916A (en) | Detection system for plugging or unplugging of external equipment on USB interface | |
| CN102393837B (en) | USB charger recognition device and method | |
| CN1881738B (en) | Charge mode control circuit and method | |
| US10148101B2 (en) | Battery charging system and battery charging protection control method | |
| EP2849023A1 (en) | Electronic device and control method therefor | |
| EP3086433A1 (en) | Charging method, alternating current adaptor, charging management device and terminal | |
| US20120166173A1 (en) | Method and system for determining an arbitrary charging protocol in usb charging ports | |
| CN105518967B (en) | Apparatus and method for changing current limit | |
| US9018896B2 (en) | Method and system for determining whether a portable device is charging | |
| CN104009529A (en) | Control circuit, battery power supply device and control method | |
| CN111404219A (en) | Method for fast USB charging, electronic device and charger device | |
| CN108318741A (en) | A kind of impedance detection circuit and detection method | |
| CN105022468A (en) | USB adapter and USB line | |
| CN111313515A (en) | Multi-output-port fast charging switching circuit and method | |
| WO2008090378A1 (en) | Battery connection unit | |
| CN203242716U (en) | Battery, battery type detection circuit and mobile terminal | |
| CN105375544A (en) | Low-battery battery charging method and power management integrated circuit | |
| CN104919388A (en) | Charging an electrical device via a data interface | |
| CN104426194A (en) | Charging method and charging equipment | |
| CN110364851B (en) | Charging connection device for electric automobile | |
| CN208226139U (en) | Electric vehicle charging connection device | |
| CN206878506U (en) | A data cable and an adapter | |
| CN213780339U (en) | Broken string detection circuitry and treasured that charges of polymorphic type charging wire | |
| CN111537915A (en) | Broken string detection circuitry and treasured that charges of polymorphic type charging wire | |
| CN211530770U (en) | Detection circuit for detecting charging state of charging chip based on single IO port |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |