Adapter and charging control method

A charging control method, wherein the method is applied in an adapter;

• the adapter supports a first charging mode and a second charging mode, the first charging mode is a constant voltage mode, and the second charging mode is a constant current mode;
• in the second charging mode, an output voltage of the adapter are directly applied to both ends of a battery of a device to be charged and an output current of the adapter being made to directly pass through the battery for direct charging of the battery;
• the adapter comprises a power converter and a sampling and holding unit;
• the power converter is configured to convert input alternating current to obtain an output voltage and an output current of the adapter, the output current of the adapter being a current with a first pulsating waveform;
• the sampling and holding unit is coupled to the power converter, and configured to sample the current with the first pulsating waveform in a sampling state, and to hold a peak value of the current with the first pulsating waveform in a holding state;
• the method comprises:
• determining whether the sampling and holding unit is in the holding state;
• and
• sampling the peak value of the current with the first pulsating waveform held by the sampling and holding unit when determining that the sampling and holding unit is in the holding state.

A charging system, comprising an adapter and a device to be charged;

• wherein,
• the adapter supports a first charging mode and a second charging mode, the first charging mode being a constant voltage mode, the second charging mode being a constant current mode;
• in the second charging mode, an output voltage of the adapter is directly applied to both ends of a battery of a device to be charged and an output current of the adapter is made to directly pass through the battery for direct charging of the battery;
• the adapter comprises:
• a power converter, configured to convert input alternating current to obtain an output voltage and an output current of the adapter, wherein the output current of the adapter is a current with a first pulsating waveform;
• a sampling and holding unit, coupled to the power converter, and configured to sample the current with the first pulsating waveform in a sampling state, and to hold a peak value of the current with the first pulsating waveform in a holding state;
• a current sampling controller, coupled to the sampling and holding unit, and configured to determine whether the sampling and holding unit is in the holding state, and to sample the peak value of the current with the first pulsating waveform held by the sampling and holding unit when the sampling and holding unit is in the holding state.