Fast Charging Method, Power Adapter and Mobile Terminal

Abstract

The present disclosure provides a fast charging method, a power adapter, and a mobile terminal. The method includes: transmitting, by the power adapter, clock signal to the mobile terminal via a first data line of the USB interface during a process of that the power adapter is coupled to the mobile terminal, wherein the clock signal is used for indicating a communication sequence between the power adapter and the mobile terminal; conducting, by the power adapter, a bidirectional communication with the mobile terminal via a second data line of the USB interface under control of the communication sequence, so as to determine to charge the mobile terminal in the fast charging mode; and adjusting, by the power adapter, charging current to the charging current corresponding to the fast charging mode to charge the mobile terminal.

What is claimed is: 
     
         1 . A power adapter, the power adapter being coupled to a mobile terminal via a Universal Serial Bus (USB) interface, a power line of the USB interface being used for the power adapter to charge the mobile terminal, the power adapter supporting a normal charging mode and a fast charging mode, a charging current corresponding to the fast charging mode being greater than a charging current corresponding to the normal charging mode, the power adapter comprising:
 a communication circuit configured to transmit clock signal to the mobile terminal via a first data line of the USB interface in a process that the power adapter is coupled to the mobile terminal, wherein the clock signal is used for indicating a communication sequence between the power adapter and the mobile terminal; and the communication circuit is further configured to conduct a bidirectional communication with the mobile terminal via a second data line of the USB interface under control of the communication sequence, so as to determine to charge the mobile terminal in the fast charging mode; and   a current adjusting circuit configured to adjust a charging current of the power adapter to be the charging current corresponding to the fast charging mode to charge the mobile terminal.   
     
     
         2 . The power adapter of  claim 1 , wherein the communication sequence comprises instruction transmission time slots of the power adapter and instruction reception time slots of the power adapter, and the instruction transmission time slots and the instruction reception time slots are alternatively generated; the communication circuit is configured to transmit a first instruction to the mobile terminal via the second data line during the instruction transmission time slot of the power adapter, and the first instruction is used to query the mobile terminal for whether or not to activate the fast charging mode; the communication circuit is further configured to receive a reply instruction corresponding to the first instruction via the second data line during the instruction reception time slot of the power adapter, and the reply instruction corresponding to the first instruction is used for indicating that the mobile terminal agrees to activate the fast charging mode; and the communication circuit is further configured to determine to charge the mobile terminal in the fast charging mode according to the reply instruction corresponding to the first instruction. 
     
     
         3 . The power adapter of  claim 2 , wherein the instruction transmission time slot of the power adapter comprises a plurality of clock periods, and each of the plurality of clock periods is used for transmitting a 1-bit data. 
     
     
         4 . The power adapter of  claim 3 , wherein the instruction transmission time slot of the power adapter comprises eight clock periods, and the first instruction comprises an 8-bit data. 
     
     
         5 . The power adapter of  claim 2 , wherein the instruction reception time slot of the power adapter comprises a plurality of clock periods, and each of the plurality of clock periods is used for receiving a 1-bit data. 
     
     
         6 . The power adapter of  claim 5 , wherein the instruction reception time slot of the power adapter comprises ten clock periods, and the reply instruction corresponding to the first instruction comprises a 10-bit data. 
     
     
         7 . The power adapter of  claim 2 , wherein the first instruction is an instruction of a fast charging communication instruction set of the power adapter, and instructions of the fast charging communication instruction set have the same previous n bits. 
     
     
         8 . The power adapter of  claim 1 , wherein each clock period of the clock signal comprises a low level of 10 μs and a high level of 500 μs. 
     
     
         9 . A mobile terminal, the mobile terminal being coupled to a power adapter via a Universal Serial Bus (USB) interface, a power line of the USB interface being used for the power adapter to charge the mobile terminal, the mobile terminal supporting a normal charging mode and a fast charging mode, charging current corresponding to the fast charging mode being greater than charging current corresponding to the normal charging mode, the mobile terminal comprising:
 a communication circuit configured to receive clock signal from the power adapter via a first data line of the USB interface during a process of that the mobile terminal is coupled to the power adapter, wherein the clock signal is used for indicating a communication sequence between the mobile terminal and the power adapter; the communication circuit is further configured to conduct a bidirectional communication with the power adapter via a second data line of the USB interface under control of the communication sequence, so as to cause the power adapter to determine to charge the mobile terminal in the fast charging mode; and   a charging circuit configured to receive the charging current corresponding to the fast charging mode from the power adapter to charge a battery of the mobile terminal.   
     
     
         10 . The mobile terminal of  claim 9 , wherein the communication sequence comprises instruction reception time slots of the mobile terminal and instruction transmission time slots of the mobile terminal, and the instruction reception time slots and the instruction transmission time slots are alternatively generated; the communication circuit is configured to receive a first instruction from the power adapter via the second data line during the instruction reception time slot of the mobile terminal, and the first instruction is used to query the mobile terminal for whether or not to activate the fast charging mode; and the communication circuit is further configured to transmit a reply instruction corresponding to the first instruction to the power adapter via the second data line during the instruction transmission time slot of the power adapter, and the reply instruction corresponding to the first instruction is used for indicating that the mobile terminal agrees to activate the fast charging mode. 
     
     
         11 . The mobile terminal of  claim 10 , wherein the instruction reception time slot of the mobile terminal comprises a plurality of clock periods, and each of the plurality of clock periods is used for receiving a 1-bit data. 
     
     
         12 . The mobile terminal of  claim 11 , wherein the instruction reception time slot of the mobile terminal comprises eight clock periods, and the first instruction comprises an 8-bit data. 
     
     
         13 . The mobile terminal of  claim 10 , wherein the instruction transmission time slot of the mobile terminal comprises a plurality of clock periods, and each of the plurality of clock periods is used for transmitting a 1-bit data. 
     
     
         14 . The mobile terminal of  claim 13 , wherein the instruction transmission time slot of the mobile terminal comprises ten clock periods, and the reply instruction corresponding to the first instruction comprises a 10-bit data. 
     
     
         15 . The mobile terminal of  claim 10 , wherein the reply instruction corresponding to the first instruction is an instruction of a fast charging communication instruction set of the mobile terminal, and instructions of the fast charging communication instruction set have the same previous n bits. 
     
     
         16 . The mobile terminal of  claim 9 , wherein each clock period of the clock signal comprises a low level of 10 μs and a high level of 500 μs. 
     
     
         17 . A power adapter, the power adapter being coupled to a mobile terminal via a Universal Serial Bus (USB) interface, a power line of the USB interface being used for the power adapter to charge the mobile terminal, data lines of the USB interface being used for a bidirectional communication between the power adapter and the mobile terminal, the power adapter supporting a normal charging mode and a fast charging mode, a charging current corresponding to the fast charging mode being greater than a charging current corresponding to the normal charging mode, the power adapter comprising:
 a charging circuit; and   a communication control circuit configured to determine to activate the fast charging mode, and transmit a second instruction to the mobile terminal, wherein the second instruction is used for querying whether or not a current output voltage of the power adapter is proper to be a charging voltage corresponding to the fast charging mode; the communication control circuit is further configured to receive a reply instruction corresponding to the second instruction from the mobile terminal, wherein the reply instruction corresponding to the second instruction is used for indicating that the current output voltage of the power adapter is proper, high, or low; the communication control circuit is further configured to adjust the current output voltage of the power adapter to be the charging voltage corresponding to the fast charging mode according to the reply instruction corresponding to the second instruction, and transmit a third instruction to the mobile terminal, wherein the third instruction is used for querying maximum charging current which is currently supported by the mobile terminal; the communication control circuit is further configured to receive a reply instruction corresponding to the third instruction from the mobile terminal, wherein the reply instruction corresponding to the third instruction is used for indicating the maximum charging current which is currently supported by the mobile terminal; the communication control circuit is further configured to determine the charging current corresponding to the fast charging mode according to the reply instruction corresponding to the third instruction, adjust output current of the power adapter to be the charging current corresponding to the fast charging mode to enter a constant current phase, and transmit a fourth instruction to the mobile terminal during the constant current phase, wherein the fourth instruction is used for querying current voltage of a battery of the mobile terminal; the communication control circuit is further configured to receive a reply instruction corresponding to the fourth instruction from the mobile terminal, wherein the reply instruction corresponding to the fourth instruction is used for indicating the current voltage of the battery of the mobile terminal; and the communication control circuit is further configured to adjust the output current of the power adapter according to the current voltage of the battery to charge the mobile terminal in a multi-stage constant current mode via the charging circuit.   
     
     
         18 . The power adapter of  claim 17 , wherein the communication control circuit is configured to transmit a first instruction to the mobile terminal, wherein the first instruction is used for querying whether or not the mobile terminal is to activate the fast charging mode; the communication control circuit is further configured to receive a reply instruction corresponding to the first instruction from the mobile terminal, wherein the reply instruction corresponding to the first instruction is used for indicating that the mobile terminal agrees to activate the fast charging mode; and the communication control circuit is further configured to determine to activate the fast charging mode according to the reply instruction corresponding to the first instruction. 
     
     
         19 . The power adapter of  claim 18 , wherein the reply instruction corresponding to the first instruction comprises a plurality of bits, the plurality of bits comprise a bit used for indicating whether or not the mobile terminal agrees to activate the fast charging mode, and a bit used for indicating a path impedance of the mobile terminal, and the path impedance of the mobile terminal is used for the power adapter to determine whether or not the USB interface is in good contact. 
     
     
         20 . The power adapter of  claim 19 , wherein a format of the reply instruction corresponding to the first instruction is 101XYYYYYY, X indicates 1 bit, and Y indicates 1 bit, X=1 indicates that the mobile terminal agrees to activate the fast charging mode, X=0 indicates that the mobile terminal disagrees to activate the fast charging mode, and the path impedance of the mobile terminal equals to YYYYYY*5 mΩ. 
     
     
         21 . The power adapter of  claim 17 , wherein the reply instruction corresponding to the second instruction comprises a plurality of bits, the plurality of bits of the reply instruction corresponding to the second instruction comprise a bit used for indicating that the current output voltage of the power adapter is proper, high, or low. 
     
     
         22 . The power adapter of  claim 21 , wherein a format of the reply instruction corresponding to the second instruction is 1010XX0000, X indicates 1 bit, XX=11 indicates that the current output voltage of the power adapter is proper, XX=10 indicates that the current output voltage of the power adapter is high, and XX=01 indicates that the current output voltage of the power adapter is low. 
     
     
         23 . The power adapter of  claim 17 , wherein the reply instruction corresponding to the third instruction comprises a plurality of bits, and the plurality of bits of the reply instruction corresponding to the third instruction comprise a bit used for indicating the maximum charging current which is currently supported by the mobile terminal. 
     
     
         24 . The power adapter of  claim 23 , wherein a format of the reply instruction corresponding to the third instruction is 1010XXXXXX, X indicates 1 bit, and the maximum charging current which is currently supported by the mobile terminal equals to 3000+(XXXXXX*250) mA. 
     
     
         25 . The power adapter of  claim 17 , wherein the reply instruction corresponding to the fourth instruction comprises a plurality of bits, and the plurality of bits of the reply instruction corresponding to the fourth instruction comprise a bit used for indicating the current voltage of the battery, and a bit used for indicating whether or not the battery is being charged. 
     
     
         26 . The power adapter of  claim 25 , wherein a format of the reply instruction corresponding to the fourth instruction is 101XYYYYYY, X indicates 1 bit, and Y indicates 1 bit, X=1 indicates that the battery is being charged, and X=0 indicates that the battery is not charged, the current voltage of the battery equals to 3404+(YYYYYY*16)mV. 
     
     
         27 . The power adapter of  claim 17 , wherein the communication control circuit is further configured to determine that the USB interface is in poor contact, and transmit a fifth instruction to the mobile terminal, wherein the fifth instruction is used for informing the mobile terminal that the USB interface is in poor contact, and informing the mobile terminal to exit the fast charging mode or redetermine whether or not to activate the fast charging mode. 
     
     
         28 . The power adapter of  claim 17 , wherein the communication control circuit is further configured to execute at least one of following operations when the power adapter determines that the reply instruction received from the mobile terminal is not correctly encoded, the following operations comprises: exciting the fast charging mode, stopping charging, or redetermining whether or not to activate the fast charging mode. 
     
     
         29 . The power adapter of  claim 17 , wherein an instruction transmitted from the power adapter to the mobile terminal comprises a plurality of bits, when the power adapter transmits any instruction, the power adapter firstly transmits MSB of a plurality of bits of the any instruction; or an instruction received from the mobile terminal by the power adapter comprises a plurality of bits, when the power adapter receives an instruction, the power adapter firstly receives MSB of a plurality of bits of the instruction. 
     
     
         30 . The power adapter of  claim 17 , wherein the instruction transmitted from the power adapter to the mobile terminal comprises a plurality of bits, during a process of transmitting each of the plurality of bits, the power adapter firstly transmits each of the plurality of bits, and then transmits the clock interrupt signal; or the reply instruction received from the mobile terminal by the power adapter comprises a plurality of bits, during a process of receiving each of the plurality of bits, the power adapter firstly transmits the clock interrupt signal, and then receives each of the plurality of bits after a preset time interval. 
     
     
         31 . The power adapter of  claim 17 , wherein each instruction transmitted from the power adapter to the mobile terminal comprises an 8-bit data, the power adapter transmits the 8-bit data to the mobile terminal via eight continuous clock periods of the clock signal, level of previous 10 μs of each of the eight continuous clock periods is low level, and level of latter 500 μs of each of the ten continuous clock periods is high level; or each reply instruction received from the mobile terminal by the power adapter comprises a 10-bit data, the power adapter receives the 10-bit data from the mobile terminal via ten continuous clock periods of the clock signal, level of previous 500 μs of each of the ten continuous clock periods is high level, and level of latter 10 μs of each of the ten continuous clock periods is low level. 
     
     
         32 . The power adapter of  claim 17 , wherein during a process of that the power adapter receives an instruction from the mobile terminal, a minimum value of high level of the clock signal equals to VDD of the power adapter minus 0.7V; or during the process of that the power adapter receives an instruction from the mobile terminal, a maximum value of low level of the clock signal is 0.8V; or during a process of that the power adapter transmits an instruction to the mobile terminal, the minimum value of the high level of the clock signal equals to 0.25VDD+0.8V; or during the process of that the power adapter transmits an instruction to the mobile terminal, a maximum value of the high level of the clock signal is 4.5V; or, during the process of that the power adapter transmits an instruction to the mobile terminal, the maximum value of the low level of the clock signal is 0.15VDD, and the VDD is work voltage of the power adapter, and/or the VDD is greater than 3.2V and less than 4.5V.