Charging method, terminal, charger, and system

Abstract

A charging method, a terminal, a charger, and a system, includes: obtaining, by a terminal, a charging mode supported by a charger connected to the terminal; when the charging mode supported by the charger includes an open-loop fast charging mode, detecting, by the terminal, whether both the terminal and the charger are in an open loop state; when both the terminal and the charger are in the open loop state, sending, by the terminal, an open-loop fast charging instruction to the charger; and receiving, by the terminal, a voltage and a current that are transmitted by the charger according to the open-loop fast charging instruction, and performing charging in the open-loop fast charging mode. When determining that the charger supports charging in the open-loop fast charging mode, the terminal is adjusted to the open loop state to perform charging, so as to shorten a charging time and improve user experience.

1 . A charging method, wherein the method comprises:
 in response to a charger detecting that a connection is established to a terminal, performing, by the charger, a handshake with the terminal, wherein the terminal determines that the charger supports an open-loop fast charging mode;   receiving, by the charger, instruction information sent by the terminal; and   in response to determining that the instruction information is used to instruct the charger to charge in the open-loop fast charging mode, outputting, by the charger, a voltage and a current according to the instruction information in the open-loop fast charging mode.   
     
     
         2 . The method according to  claim 1 , wherein the performing, by the charger, a handshake with the terminal comprises:
 setting, by the charger, a voltage signal of a communication cable, wherein the terminal determines, according to the voltage signal, that the charger supports the open-loop fast charging mode.   
     
     
         3 . The method according to  claim 1 , wherein the performing, by the charger, a handshake with the terminal comprises:
 receiving, by the charger, an inquiry request sent by the terminal, wherein the inquiry request is used to obtain a charging mode supported by the charger; and   sending, by the charger, feedback information to the terminal, wherein the feedback information is used to indicate that the charger supports a fast charging mode.   
     
     
         4 . The method according to  claim 1 , wherein the instruction information comprises a battery voltage value of the terminal; and
 wherein the outputting, by the charger, a voltage and a current according to the instruction information in the open-loop fast charging mode comprises:
 adjusting, by the charger, the voltage to K times the battery voltage value, wherein K is a pre-stored fixed conversion ratio coefficient, and K is a constant value and is any real number greater than 1; 
 determining, by the charger, a current corresponding to the battery voltage value, wherein a correspondence between the battery voltage value and the current is pre-stored in the charger; and 
 outputting, by the charger, a voltage of the K times the battery voltage value, and outputting the current corresponding to the battery voltage value. 
   
     
     
         5 . The method according to  claim 1 , wherein the instruction information comprises a battery voltage value of the terminal and a target voltage value of the terminal; and
 wherein the outputting, by the charger, a voltage and a current according to the instruction information in the open-loop fast charging mode comprises:
 adjusting, by the charger, the voltage to the target voltage value; 
 determining, by the charger, a current value corresponding to the battery voltage value, wherein a correspondence between the battery voltage value and the current is pre-stored in the charger; and 
 outputting, by the charger, a voltage of the target voltage value, and outputting the current corresponding to the battery voltage value. 
   
     
     
         6 . The method according to  claim 1 , wherein the instruction information comprises a target voltage value and a target current value; and
 wherein the outputting, by the charger, a voltage and a current according to the instruction information in the open-loop fast charging mode comprises:
 adjusting, by the charger, the voltage to the target voltage value; 
 adjusting, by the charger, the current to the target current value; and 
 outputting, by the charger, a voltage of the target voltage value and a current of the target current value. 
   
     
     
         7 . A charger, wherein the charger comprises:
 a handshake unit configured to: in response to the charger detecting that a connection is established to a terminal, perform a handshake with the terminal, wherein the terminal determines that the charger supports an open-loop fast charging mode;   a receiver configured to receive instruction information sent by the terminal; and   an output unit configured to: in response to determining that the instruction information is used to instruct the charger to charge in the open-loop fast charging mode, output a voltage and a current according to the instruction information in the open-loop fast charging mode.   
     
     
         8 . The charger according to  claim 7 , wherein the handshake unit is further configured to set a voltage signal of a communication cable, and wherein the terminal determines, according to the voltage signal, that the charger supports the open-loop fast charging mode. 
     
     
         9 . The charger according to  claim 8 , wherein:
 the receiver is further configured to receive an inquiry request sent by the terminal, wherein the inquiry request is used to obtain a charging mode supported by the charger; and   the handshake unit is further configured to send feedback information to the terminal, wherein the feedback information is used to indicate that the charger supports a fast charging mode.   
     
     
         10 . The charger according to  claim 7 , wherein the instruction information comprises a battery voltage value of the terminal;
 wherein the output unit is configured to:
 adjust the voltage to K times the battery voltage value, and output a voltage of the K times the battery voltage value, wherein K is a pre-stored fixed conversion ratio coefficient, and K is a constant value and is any real number greater than 1; and 
 determine a current corresponding to the battery voltage value, and output the current corresponding to the battery voltage value, wherein a correspondence between the battery voltage value and the current is pre-stored in the charger. 
   
     
     
         11 . The charger according to  claim 7 , wherein the instruction information comprises a battery voltage value of the terminal and a target voltage value of the terminal;
 wherein the output unit is configured to:
 adjust the voltage to the target voltage value, and output a voltage of the target voltage value; and 
 determine a current value corresponding to the battery voltage value, and output the current corresponding to the battery voltage value, wherein a correspondence between the battery voltage value and the current is pre-stored in the charger. 
   
     
     
         12 . The charger according to  claim 7 , wherein the instruction information comprises a target voltage value and a target current value;
 wherein the output unit is configured to:
 adjust the voltage to the target voltage value, and output a voltage of the target voltage value; and 
 adjust the current to the target current value and output a current of the target current value. 
   
     
     
         13 . A charging system, wherein the charging system comprises a connection cable, a terminal, and a charger, wherein the terminal is connected to the charger by using the connection cable, and wherein the charger is configured to:
 in response to detecting that a connection is established to the terminal, perform a handshake with the terminal, wherein the terminal determines that the charger supports an open-loop fast charging mode;   receive instruction information sent by the terminal; and   in response to determining that the instruction information is used to instruct the charger to charge in the open-loop fast charging mode, output a voltage and a current according to the instruction information in the open-loop fast charging mode.   
     
     
         14 . The charging system according to  claim 13 , wherein the charger sets a voltage signal of the connection cable, and wherein the terminal determines, according to the voltage signal, that the charger supports the open-loop fast charging mode. 
     
     
         15 . The charging system according to  claim 13 , wherein the charger receives an inquiry request sent by the terminal and sends feedback information to the terminal, wherein the inquiry request is used to obtain a charging mode supported by the charger, and wherein the feedback information is used to indicate that the charger supports a fast charging mode. 
     
     
         16 . The charging system according to  claim 13 , wherein the instruction information comprises a battery voltage value of the terminal, and wherein the charger is configured to:
 adjust the voltage to K times the battery voltage value, and output a voltage of the K times the battery voltage value, wherein K is a pre-stored fixed conversion ratio coefficient, and K is a constant value and is any real number greater than 1; and   determine a current corresponding to the battery voltage value, and output the current corresponding to the battery voltage value, wherein a correspondence between the battery voltage value and the current is pre-stored in the charger.   
     
     
         17 . The charging system according to  claim 13 , wherein the instruction information comprises a battery voltage value of the terminal and a target voltage value of the terminal, and wherein the charger is configured to:
 adjust the voltage to the target voltage value, and output a voltage of the target voltage value; and   determine a current value corresponding to the battery voltage value, and output the current corresponding to the battery voltage value, wherein a correspondence between the battery voltage value and the current is pre-stored in the charger.   
     
     
         18 . The charging system according to  claim 13 , wherein the instruction information comprises a target voltage value and a target current value, and wherein the charger is configured to:
 adjust the voltage to the target voltage value, and output a voltage of the target voltage value; and   adjust the current to the target current value and output a current of the target current value.   
     
     
         19 . A charging method, wherein the method comprises:
 obtaining, by a charger, a charging mode supported by a terminal connected to the charger;   in response to determining that the charging mode supported by the terminal comprises an open-loop fast charging mode, detecting, by the charger, whether both the terminal and the charger are in an open loop state;   in response to determining that both the terminal and the charger are in the open loop state, obtaining, by the charger, a charging parameter of the terminal; and   adjusting, by the charger, a voltage and a current according to the charging parameter, and transmitting, to the terminal, an adjusted voltage and an adjusted current.