Power adapter

A power adapter comprising:

• a housing having a receiving cavity, the housing being provided, with at least one heat dissipation hole penetrating to the receiving cavity;
• an electronic assembly comprising a plurality of electronic elements located in the receiving cavity;
• and
• a protective assembly comprising a connection portion connected to an outer wall of the housing and extending outward, and a protective portion connected to an extension end of the connection portion, wherein the protective portion is spaced apart from the housing, and a projection of the protective portion toward the housing covers the heat dissipation hole;
• wherein the housing comprises a main body portion and a heat dissipation portion, the main body portion is cylindrical, the heat dissipation portion is connected to an edge of the main body portion and extends circumferentially along the edge, the heat dissipation hole is formed in the heat dissipation portion, the connection portion is connected to the heat dissipation portion, a plurality of the heat dissipation holes are provided, the plurality of the heat dissipation holes are arranged at intervals along an extension direction of the heat dissipation portion, the connection portion has a ring shape adapted to the heat dissipation portion, and the protective portion has a ring shape adapted to the connection portion.