Charging system, terminal, power adapter and charging line

A charging system, comprising:

• a terminal, comprising a first controller and M charging input interfaces, where M is an integer greater than 1;
• a power adapter, comprising a second controller and N charging output interfaces, where N is an integer greater than 1;
• wherein, when a quick charging is required, a plurality of charging input interfaces of the terminal are coupled to a plurality of charging output interfaces of the power adapter, and a charging current outputted from the power adapter to the terminal is adjusted to k times a preset charging current according to the number of charging output interfaces of the power adapter coupled to the terminal, where k is an integer greater than or equal to 1, an overcurrent capacity of each charging input interface is the preset charging current, and an overcurrent capacity of each charging output interface is the preset charging current;
• wherein, the first controller is configured to determine the number of charging output interfaces of the power adapter coupled to the terminal, and transmit the number of charging output interfaces to the second controller;
• and
• wherein the second controller is configured to determine the number of charging output interfaces of the power adapter coupled to the terminal, use a minimum of the number of charging output interfaces determined by the first controller and the number of charging output interfaces determined by the second controller as a final number of charging output interfaces, and adjust the charging current outputted from the power adapter to the terminal according to the final number of charging output interfaces.