Charging device and method, power adapter and terminal

A charging device, comprising:

• a first rectifier, configured to rectify an alternating current (AC) to output a voltage with a first pulsating waveform;
• a switch unit;
• a control unit, configured to output a control signal to the switch unit, such that the switch unit modulate the voltage with the first pulsating waveform without filtering based on the control signal;
• a transformer, configured to perform voltage transformation on the modulated voltage with the first pulsating waveform to output a voltage with a second pulsating waveform;
• and
• a second rectifier, configured to rectify the voltage with the second pulsating waveform to output a voltage with a third pulsating waveform to a chargeable battery, wherein the third pulsating waveform keeps synchronous with the first pulsating waveform of the modulated voltage.

A non-transitory computer readable storage medium having stored therein program instructions, wherein the instructions are configured to be invoked by a charging device to realize acts of:

• controlling a first rectifier to rectify an alternating current (AC) to output a voltage with a first pulsating waveform;
• outputting a control signal to a switch unit, such that the switch unit modulate the voltage with the first pulsating waveform without filtering based on the control signal;
• controlling a transformer to perform voltage transformation on the modulated voltage with the first pulsating waveform to output a voltage with a second pulsating waveform;
• and
• controlling a second rectifier to rectify the voltage with the second pulsating waveform to output a voltage with a third pulsating waveform to a chargeable battery, wherein the third pulsating waveform keeps synchronous with the first pulsating waveform of the modulated voltage.