Adapter and charging control method

An adapter, comprising:

• a power conversion unit, configured to convert input alternating current to obtain output voltage and output current of the adapter, in which the output current of the adapter is first current with first pulsating waveform;
• a sampling and holding unit, coupled to the power conversion unit, and configured to sample the first current when the sampling and holding unit is in a sampling state, and to hold a peak value of the first current when the sampling and holding unit is in a holding state;
• a current collecting and controlling unit, coupled to the sampling and holding unit, and configured to determine whether the sampling and holding unit is in the holding state, and to collect the peak value of the first current held in the sampling and holding unit when the sampling and holding unit is in the holding state;
• and
• a voltage adjusting unit, coupled to the power conversion unit, and configured to detect and adjust the output voltage of the adapter;
• wherein the current collecting and controlling unit is coupled to the voltage adjusting unit, and configured to adjust the peak value of the first current via the voltage adjusting unit;
• wherein the voltage adjusting unit comprises:
• a voltage sampling unit, coupled to the power conversion unit, and configured to sample the output voltage of the adapter to obtain a first voltage;
• a voltage comparing unit, having an input end coupled to the voltage sampling unit, and configured to compare the first voltage and a first reference voltage;
• and
• a voltage control unit, having an input end coupled to an output end of the voltage comparing unit, and an output end coupled to the power conversion unit, and configured to control the output voltage of the adapter according to a comparison result between the first voltage and the first reference voltage;
• wherein the current collecting and controlling unit comprises a first control unit and a digital analogue converter;
• wherein an input end of the digital analogue converter is coupled to the first control unit, an output end of the digital analogue converter is coupled to the voltage comparing unit, and the first control unit is configured to adjust the value of the first reference voltage via the digital analogue converter so as to adjust the peak value of the first current.