Charging apparatus, charging method and charging system

A charging apparatus, comprising a first charging module, a second charging module and a third charging module, wherein

• the first charging module is configured to receive a first voltage of an AC grid, convert the first voltage into a first output voltage, and provide the first output voltage to a first device for charging the first device;
• the second charging module is configured to receive a second voltage of the AC grid, convert the second voltage into a second output voltage, and provide the second output voltage to a second device for charging the second device;
• the third charging module is configured to receive a third voltage of the AC grid, convert the third voltage into a third output voltage, and provide the third output voltage to a third device for charging the third device;
• the first charging module, the second charging module and the third charging module have a one-to-one correspondence relationship with the first device, the second device and the third device;
• the first voltage, the second voltage and the third voltage have the same frequency and amplitude, and the phase difference is 120 degrees;
• and
• the three charging modules are configured to control the three voltages of the AC grid to charge the first device, the second device and the third device simultaneously.