Power supply device

FIG. 1 is a front perspective view of the power supply device showing our new design;

FIG. 2 is a front view thereof

FIG. 3 is a rear view thereof

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof;

FIG. 8 is a front view thereof, with the handle shown in an alternate position; and,

FIG. 9 is a front perspective view thereof, shown in environmental use.

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