Power adapter

A power adapter, comprising:

• a first substrate, comprising a first terminal set;
• a second substrate, comprising a second terminal set;
• a transformer, comprising a primary side connection terminal and a secondary side connection terminal, wherein the primary side connection terminal is connected to the first terminal set and the secondary side connection terminal is connected to the second terminal set;
• and
• an insulating frame, disposed between the first substrate and the second substrate, wherein the transformer comprises a first side surface and a second side surface opposite to the first side surface, the primary side and the secondary side are located on the first side surface, and the first substrate, the second substrate and the insulating frame lean against the first side surface of the transformer.