CHARGING SYSTEM, CHARGING METHOD, AND POWER ADAPTER

The present disclosure discloses a charging method, a power adapter (1) and a computer readable storage medium. The charging method includes: performing (S1) a first rectification on an input alternating current to output a first voltage with a first pulsating waveform; performing (S2) a voltage conversion and a second rectification on the first voltage, to acquire a second voltage with a second pulsating waveform, and the second voltage being used to charge a battery in a terminal; controlling the voltage conversion according to a feedback from the terminal, to adjust a magnitude of the second voltage. The charging method is characterized by: communicating with the terminal to determine a charging mode, the charging mode comprising a first charging mode and a second charging mode, the second charging mode being configured to charge the battery in the terminal with the second voltage, the first charging mode being configured to charge the battery with a fourth voltage obtained by performing filtering on the second voltage; and when it is determined to charge the battery in the first charging mode, controlling a filter to perform the filtering on the second voltage to output the fourth voltage for charging the battery.