Fast Charging Method and System, Terminal, and Charger

A fast charging method, comprising:

• detecting, by an electronic device, a value of a voltage between positive and negative electrodes of a battery in the electronic device;
• generating, by the electronic device, instruction information according to the value of the voltage between the positive and negative electrodes of the battery;
• adjusting, by a charger, an output voltage and an output current according to the instruction information from the electronic device;
• receiving, by the electronic device, the output voltage and the output current transmitted from the charger;
• converting, by the electronic device, the output voltage of the charger into 1/K times the output voltage;
• the K being a conversion coefficient of a conversion circuit with a fixed conversion ratio in the electronic device, and K being any real number greater than one;
• and
• charging, by the electronic device, the battery with the 1/K times the output voltage.

A fast charging system, comprising:

• a charger;
• and
• an electronic device coupled to the charger and configured to:
• generate instruction information according to the value of the voltage between the positive and negative electrodes of the battery;
• and
• send the instruction information to the charger, the charger being configured to:
• adjust a voltage value of an output voltage;
• determine a charging mode according to the instruction information;
• and
• the terminal being further configured to:
• convert the output voltage of the charger into 1/K times the output voltage to enable a charging circuit between two ends of the battery to charge the battery with the 1/K times the output voltage,
• the K being a conversion coefficient of a conversion circuit with a fixed conversion ratio in the terminal, K is any real number greater than one.