Power supply

A power supply, comprising:

• a bottom case and a top cover, said bottom case and said top cover being fitted together to delimit an accommodating space;
• a circuit board, mounted on said bottom case and located within said accommodating space, said circuit board being provided with a plurality of electronic components for forming a power supply circuit, said circuit board comprising a plurality of post mounting positions not disposed with said plurality of electronic components, and said plurality of post mounting positions being separated and at least one of said plurality of electronic components being located between any two of said plurality of post mounting positions;
• and
• a heat-dissipating fan, including a supporting frame, a driving module provided on said supporting frame, and a fan blade set covering said driving module and being driven by said driving module to rotate, said supporting frame being provided with a main body for said driving module and said fan blade set to be installed, as well as a plurality of supporting posts connected to said main body and fixed on said circuit board, respectively, said supporting frame being not provided with a barrier wall around said fan blade set, and a height of said main body supported by said a plurality of supporting posts being at least higher than the highest of said plurality of electronic components.