Charging adapter having pneumatic pump and charging system

A charging system, comprising:

• a charging adapter and a mobile terminal,
• the charging adapter comprising:
• a pneumatic pump;
• a pneumatic cover;
• a sealing rubber gasket;
• a pneumatic valve;
• an air pressure monitor for monitoring air pressure intensity in the pneumatic cover;
• and
• an air pressure controller for controlling the pneumatic pump and the pneumatic valve to be turned on and off,
• wherein the pneumatic pump, the air pressure monitor, the air pressure controller and the pneumatic valve are fixed on a side surface of the pneumatic cover respectively, and the sealing rubber gasket is disposed at a periphery of an opening of the pneumatic cover,
• the mobile terminal comprising:
• a speaker comprising a diaphragm and a sound hole, configured to generate different quantities of electricity through vibration of the diaphragm according to different air pressures in a sealed cavity;
• a charging manager, configured to convert the quantity of electricity generated by the speaker to electric current;
• and
• a power manager, configured to store the electric current obtained from the charging manager into a battery of the mobile terminal;
• wherein the sound hole of the speaker tightly fits with the pneumatic cover through the sealing rubber gasket during charging, thereby forming the sealed cavity.