CHARGER

A charger includes a housing, a fan, and a circuit board assembly. The housing is formed with an air inlet and an air outlet. The fan is disposed in the housing and used for generating a heat dissipation. A heat dissipation channel for the heat dissipation airflow to flow through is further formed in the housing and includes a first channel and a second channel. A first port of the first channel facing the air inlet has a larger cross-sectional area than the second channel so that the heat dissipation airflow flowing through the first channel is capable of accelerating through the second channel.