Power Supply Device

FIG. 1 is a front-left perspective view of a power supply device according to the new design;

FIG. 2 is a left view thereof;

FIG. 3 is a right view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a back view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof; and,

FIG. 8 is a bottom-right perspective view thereof.

The broken lines shown represent unclaimed subject matter and form no part of the claimed design.