Abstract: A centrifugal fan having an upside-down mounted structure and being mounted on a heat-dissipating plate includes a frame fixed on the heat-dissipating plate and a stator upside-down mounted in the frame and fixed on the upper surface. The frame includes an upper surface positioned away from the heat-dissipating plate, a side surface substantially perpendicular to the upper surface, at least one inlet formed on the upper surface, and an outlet formed on the side surface. The stator includes a printed circuit board positioned close to the upper surface and positioned away from the heat-dissipating plate.

Abstract: A heat dissipation device includes a rotor, a plurality of centrifugal blades provided around the rotor, a stator provided inside the rotor for driving the rotor to rotate, and a base provided under the rotor and the stator without enclosing the rotor. The base includes a central portion connected with the stator, and a plurality of extension portions extending from the central portion to the outside. A plurality of holes are formed at a side of each of the plurality of extension portions away from the central portion, respectively.