A fast charging apparatus includes a power conversion unit, a feedback module, a feedback adjustment module and a voltage mode fast charging signal processing module. The power conversion unit includes a pulse width modulation controller. The pulse width modulation controller includes an electronic apparatus current fast charging signal detection unit. The feedback module informs the power conversion unit to increase a charging power for an electronic apparatus if the electronic apparatus sends a voltage mode fast charging signal to the voltage mode fast charging signal processing module. The electronic apparatus current fast charging signal detection unit informs the power conversion unit to increase the charging power for the electronic apparatus if the electronic apparatus current fast charging signal detection unit detects a current mode fast charging signal sent from the electronic apparatus.