CN106374309B - USB transmission line, mobile terminal and USB charging method - Google Patents
USB transmission line, mobile terminal and USB charging method Download PDFInfo
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- CN106374309B CN106374309B CN201610949732.4A CN201610949732A CN106374309B CN 106374309 B CN106374309 B CN 106374309B CN 201610949732 A CN201610949732 A CN 201610949732A CN 106374309 B CN106374309 B CN 106374309B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R31/00—Coupling parts supported only by co-operation with counterpart
- H01R31/06—Intermediate parts for linking two coupling parts, e.g. adapter
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/648—Protective earth or shield arrangements on coupling devices, e.g. anti-static shielding
- H01R13/652—Protective earth or shield arrangements on coupling devices, e.g. anti-static shielding with earth pin, blade or socket
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/66—Structural association with built-in electrical component
- H01R13/665—Structural association with built-in electrical component with built-in electronic circuit
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a USB transmission line, which comprises a first plug inserted into a mobile terminal, a second plug inserted into a charger and a cable connecting the first plug and the second plug, and is characterized in that the first plug is provided with at least two power supply pins, at least two grounding pins, a plurality of data signal pins and an identification pin, wherein the identification pin is grounded after being connected with a resistor in series. The invention can realize the identification of the USB transmission line without an additional chip.
Description
Technical Field
The invention relates to the technical field of connectors, in particular to a USB transmission line, a mobile terminal and a USB charging method.
Background
Nowadays, electronic technology is rapidly developed, functions of portable devices such as smart phones, tablet computers, digital cameras and multimedia players become more abundant, and great convenience is brought to life and communication. With the continuous emergence of portable devices, USB interfaces have also gained great popularity with the advantages of their fast transmission speed, convenient use, support for hot plug, flexible connection, independent power supply, etc. Besides using the USB interface for data transmission, charging the lithium battery used by the portable device is also a hot spot of the current USB interface application.
Fig. 1 is a schematic diagram of a USB connector in the prior art, and a USB plug 100 has 5 pins including a power pin 101, a data signal pin 102, a data signal pin 103, an ID pin 104 for identifying a host or a peripheral, and a ground pin 105, which correspond to 5 terminals of a USB socket 110.
As the performance of portable devices increases, the power required to rapidly charge their batteries also increases. However, the conventional USB connector can only form a charging loop through a power path and a ground path for charging, and is limited by the structural limitation of the USB connector and the limitation of temperature rise under large-current charging, and the charging current is difficult to reach above 3A.
In order to solve the problem of current limitation, an improved 7pin connector mode is provided in the prior art, and a pair of positive and negative power supply pins is additionally arranged outside a traditional 5pin interface, so that the positive and negative power supplies respectively have 2 pairs of pins for supplying power to realize large-current charging of a USB transmission line. However, in order to enable the charger to identify whether the USB transmission line can support large-current charging, a chip must be added to the corresponding transmission line for detection of the fast charging data line, which is poor in universality and compatibility.
Disclosure of Invention
The present invention is directed to overcome the drawbacks of the prior art, and provides a USB transmission line and a USB charging method to solve the problems of slow charging speed and poor versatility of the conventional USB transmission line.
To achieve the above object, the present invention provides a USB transmission line, which includes a first plug inserted into a mobile terminal, a second plug inserted into a charger, and a cable connecting the first plug and the second plug. The first plug is provided with at least two power supply pins, at least two grounding pins, a plurality of data signal pins and an identification pin; the identification pin is grounded after being connected with a resistor in series, and when the first plug is inserted into the mobile terminal, the mobile terminal enters a corresponding charging mode by detecting the voltage value of the identification pin.
Preferably, the five middle pins of the first plug are the power supply pin, the pair of data signal pins, the identification pin and the ground pin in sequence.
Preferably, the resistance value of the series resistor of the identification pin has a corresponding relationship with the number of the power supply pins and the ground pins.
Preferably, the first plug further comprises a communication pin conforming to the USB PD protocol.
According to another aspect of the present invention, there is provided a mobile terminal including: a USB interface for inserting the first plug of the USB transmission line according to claim 1, which includes a plurality of terminals in one-to-one correspondence with respective pins of the first plug; the ADC detection end is used for detecting the voltage value of the identification pin in the USB transmission line; and the control end enters a corresponding charging mode according to the detection result.
Preferably, the first plug further comprises a communication pin conforming to the USB PD protocol, and the second plug comprises a power signal pin, a data signal pin, and a communication pin conforming to the USB PD protocol; the control end communicates with the charger through the communication pin and the communication pin to control the charged voltage and current.
Preferably, the five middle pins of the first plug are the power supply pin, the pair of data signal pins, the identification pin and the grounding pin in sequence; five pins in the middle of the USB interface are a power supply pin, a pair of data signal pins, an identification pin and a grounding pin in sequence.
Preferably, the resistance value of the series resistor of the identification pin has a corresponding relationship with the number of the power supply pins and the ground pins.
According to another aspect of the present invention, there is also provided a USB charging method, including detecting a voltage value of an identification pin in the USB transmission line; and entering a corresponding charging mode according to the detection result.
According to another aspect of the present invention, there is also provided a USB charging method, including detecting a voltage value of an identification pin in the USB transmission line; and entering a corresponding charging mode according to the detection result, wherein the charging mode is controlled by communicating with the charger through the communication pin and the communication pin.
Compared with the prior art, the USB transmission line provided by the invention has the advantages that the grounding resistor is connected in series with the identification pin, the type of the USB transmission line and the corresponding charging mode can be identified without an additional chip, and the charging safety is ensured. In addition, the USB interface in the mobile device of the invention can be compatible with the 5pin micro USB transmission line in the prior art.
Drawings
FIG. 1 is a schematic diagram of a prior art USB connector;
FIG. 2 is a schematic diagram of a USB transmission line according to an embodiment of the present invention;
FIG. 3 is a pin diagram of a first plug of a USB transmission line according to an embodiment of the present invention;
fig. 4 is a block diagram of a mobile terminal according to an embodiment of the invention.
Detailed Description
In order to make the contents of the present invention more comprehensible, the present invention is further described below with reference to the accompanying drawings. The invention is of course not limited to this particular embodiment, and general alternatives known to those skilled in the art are also covered by the scope of the invention.
Referring to fig. 2, the USB transmission line of the present embodiment includes a first plug 1 inserted into the mobile terminal, a second plug 2 inserted into the charger, and a cable 3 connecting the first plug and the second plug. The mobile terminal in this specification includes mobile terminals such as a portable phone, a smart phone, a notebook computer, a digital broadcasting terminal, a personal digital assistant, a portable multimedia player, a navigation system, etc., and the present invention is not limited thereto.
As shown in fig. 3, the first plug 1 includes at least two power pins VBUS, at least two ground pins GND, a plurality of data signal pins D +, D-and an identification pin ID, wherein the identification pin ID is grounded after being connected in series with a resistor R. Compared with the existing 5pin USB transmission line, the invention adds at least one power supply pin and one grounding pin at the first plug 1, so that at least two charging loops can be formed when the USB transmission line is used for charging, thereby supporting high-current charging. In order to identify the large-current charging, an identification pin ID is added to the first plug of the USB transmission line. Unlike the existing OTG data line, the identification pin ID is not directly grounded, but is grounded after the series resistor R. Therefore, when the first plug 1 is inserted into the mobile terminal, the mobile terminal can identify whether the USB transmission line supports large-current charging or not by detecting the voltage value of the identification pin ID, and accordingly enters a charging mode. Specifically, referring to fig. 4, the mobile terminal includes a USB interface 41, a voltage divider circuit 42, an ADC detection terminal 43, and a control terminal 44. The USB interface 41 includes a plurality of terminals corresponding to the pins of the first plug, and the identification terminal corresponding to the identification pin ID is connected to the voltage dividing point of the voltage dividing circuit 42. The ADC detection terminal is also connected to the voltage division point, and is configured to detect a level value of the voltage division point, that is, a voltage value of the identification pin, after the first plug is plugged into the USB interface 41. The control terminal 44 calculates the value of the series resistor R from the voltage value of the identification pin and enters a corresponding charging mode. Because the identification pin of the common data line is suspended, the voltage value of the identification pin cannot be detected by the ADC detection end, the control end 44 cannot identify the identification pin as a high-current quick-charging data line, and the data line is still charged in a common charging mode, for example, the charging current is 1A; if the ADC detects the voltage value of the identification pin and the control terminal calculates the voltage-dividing resistance value according to the detection result, the control terminal 44 will recognize that the USB transmission line is a high-current fast-charging data line, and will charge in a high-current charging mode (for example, the charging current is equal to 3A). Preferably, the resistance of the series resistor of the identification pin may have a corresponding relationship with the number of the power pins and the ground pins. For example, for a USB transmission line with 2 power pins and 2 ground pins, the resistance of the series resistor is R1; for a USB transmission line with 3 power pins and 3 ground pins, the resistance of the series resistor is R2. Therefore, the control end settles the value of the voltage dividing resistance according to the detection result of the ADC detection end and enters a corresponding large-current quick charging mode for charging. When the calculated voltage division resistance value is R1, charging with a first current (for example, 3A); when the calculated voltage-dividing resistance value is R2, the battery is charged with a second current (e.g., 4A).
In a preferred embodiment of the present invention, the first plug 1 further comprises a communication pin, which is a CC pin conforming to the Type C interface USB PD protocol. The second plug of the corresponding USB transmission line comprises a CC communication pin conforming to the USB PD protocol. During the charging process, the control terminal 43 of the mobile terminal communicates with the charger through the communication pin and the communication pin to control the charging voltage and current.
Table 1 and table 2 are definitions of functional pins of the first plug and functional pins of the second plug of the USB transmission line in this embodiment, respectively.
TABLE 1
TABLE 2
As can be seen from table 1 and fig. 3, the middle five pins of the first plug in this embodiment are a power pin VBUS, a pair of data signal pins D +, D-, an identification pin ID, and a ground pin GND in sequence. Accordingly, the five middle pins of the USB interface of the mobile terminal are a power pin, a pair of data signal pins, an identification pin and a grounding pin in sequence. Because five middle pins of the mobile terminal USB interface correspond to the pins of the common USB transmission line one to one, the mobile terminal USB interface can be compatible with the USB plug in the prior art, and the application range is wider.
It should be noted that the invention has no limit to the shape and encapsulation of the USB transmission line plug/mobile terminal USB interface (socket), and the size of the interface, which can be a standard USB plug or socket, or a Micro USB plug or socket, and the like, and has no limit to the type of the material used, and the electrical parameters meet the basic electrical requirements of the industry.
In summary, the identification pin is connected with the ground resistor in series, so that the identification of the type of the USB transmission line and the corresponding charging mode can be realized without an additional chip, and the charging safety is ensured.
Although the present invention has been described with reference to preferred embodiments, it is to be understood that the foregoing is illustrative and not restrictive, and that various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. An apparatus comprising a USB transmission line and a mobile terminal, the USB transmission line comprising a first plug for insertion into the mobile terminal, a second plug for insertion into a charger, and a cable connecting the first plug and the second plug, wherein the first plug has at least two power pins, at least two ground pins, a plurality of data signal pins, and an identification pin; the identification pin is grounded after being connected with a series resistor in series; a charging mode with at least one loop is formed between each pair of the power supply pin and the grounding pin according to the magnitude of charging current;
the mobile terminal is provided with a USB interface, a voltage division circuit, an ADC detection end and a control end, wherein the USB interface is used for being inserted into the first plug of the USB transmission line and comprises a plurality of terminals in one-to-one correspondence with pins of the first plug, and the identification terminal corresponding to the identification pin is connected with a voltage division point of the voltage division circuit; the ADC detection end is also connected with a voltage division point and is used for detecting a level value of the voltage division point after a first plug is inserted into the USB interface, namely a voltage value of an identification pin, the control end calculates a value of the resistor through the voltage value of the identification pin and enters a corresponding charging mode, and the resistance value of a series resistor of the identification pin has a corresponding relation with the number of the power supply pin and the number of the grounding pins;
when the first plug is inserted into the mobile terminal, the mobile terminal enters a corresponding charging mode by detecting the voltage value of the identification pin, wherein the charging mode comprises a common charging mode and a large-current charging mode.
2. The apparatus of claim 1, wherein the five middle pins of the first plug are the power pin, the pair of data signal pins, the identification pin and the ground pin.
3. The apparatus of claim 1, wherein the first plug and the USB transmission line have two power pins and two ground pins, and the ADC detecting terminal cannot detect the voltage value of the identification pin when the mobile terminal requires a normal charging mode for charging; when the mobile terminal needs to be charged in a large charging mode, the ADC detection end detects the voltage value of the identification pin and calculates that the divider resistance of the ADC detection end is equal to the resistance value of the series resistor, and the control end is controlled to identify the USB transmission line as a large-current quick-charging data line and charge the mobile terminal in the large-current charging mode.
4. The apparatus of claim 1, wherein the first plug and the USB transmission line have three power pins and three ground pins, and the ADC detecting terminal cannot detect the voltage value of the identification pin when the mobile terminal requires a normal charging mode for charging; when the mobile terminal needs to be charged in a large charging mode, the ADC detection end detects the voltage value of the identification pin and calculates the resistance value of the divider resistor equal to the series resistor, the control end is controlled to identify the USB transmission line as a large-current quick-charging data line, the mobile terminal is charged in a first large-current charging mode, and the ADC detection end detects the voltage value of the identification pin and calculates the resistance value of the divider resistor unequal to the series resistor, and the mobile terminal is charged in a second large-current charging mode.
5. The apparatus of claim 1, comprising a USB transmission line and a mobile terminal, wherein the first plug further comprises a communication pin conforming to USB PD protocol.
6. The apparatus of claim 3, wherein the first plug further comprises a communication pin conforming to the USB PD protocol, and the second plug comprises a power signal pin, a data signal pin, and a communication pin conforming to the USB PD protocol; the control end communicates with the charger through the communication pin and the communication pin to control the charged voltage and current.
7. The apparatus comprising a USB transmission line and a mobile terminal according to claim 3, wherein the middle five pins of the first plug are the power pin, the pair of data signal pins, the identification pin and the ground pin in sequence; five middle pins of the USB interface are five terminals in the plurality of terminals in one-to-one correspondence with the pins of the first plug, and the five middle pins of the USB interface are a power supply pin, a pair of data signal pins, an identification pin and a grounding pin in sequence.
8. A charging method between a USB and a mobile terminal is characterized by comprising the following steps:
detecting a voltage value of an identification pin in the USB transmission line according to any one of claims 1 to 7;
and entering a corresponding charging mode according to the detection result.
9. A charging method between a USB and a mobile terminal is characterized by comprising the following steps:
detecting a voltage value of an identification pin in the USB transmission line according to any one of claims 1 to 7;
entering a corresponding charging mode according to the detection result; the first plug further comprises a communication pin conforming to the USB PD protocol, and the second plug further comprises a communication pin conforming to the USB PD protocol; communicating with the charger through the communication pin and the communication pin to control the voltage and current of the charge.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610949732.4A CN106374309B (en) | 2016-11-02 | 2016-11-02 | USB transmission line, mobile terminal and USB charging method |
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| CN201610949732.4A CN106374309B (en) | 2016-11-02 | 2016-11-02 | USB transmission line, mobile terminal and USB charging method |
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| CN106374309B true CN106374309B (en) | 2020-12-11 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107492921B (en) * | 2017-07-05 | 2020-07-14 | 深圳市正浩创新科技有限公司 | Electronic device and charging control circuit thereof |
| CN111316523A (en) * | 2017-10-19 | 2020-06-19 | 深圳市柔宇科技有限公司 | Cable through-current capacity detection method and electronic equipment |
| CN110417069B (en) * | 2018-04-28 | 2021-08-20 | 华为技术有限公司 | Charging device, USB cable and charging system |
| CN111817097A (en) * | 2020-07-14 | 2020-10-23 | 维沃移动通信有限公司 | Charging control method and data line |
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