FIG. 1 is a top plan view of a portable wireless charging pad of my new design;
FIG. 2 is a front perspective view thereof;
FIG. 3 is a front elevation view thereof;
FIG. 4 is front, top, right side perspective view thereof;
FIG. 5 is a top, right side perspective view thereof;
FIG. 6 is a right side elevation view thereof;
FIG. 7 is a rear, top, right side elevation view thereof;
FIG. 8 is a rear, top perspective view thereof;
FIG. 9 is a rear elevation view thereof;
FIG. 10 is a rear, top, left side perspective view thereof;
FIG. 11 is a top, left side perspective view thereof;
FIG. 12 is a left side elevation view thereof;
FIG. 13 is a front, top, left side perspective view thereof; and,
FIG. 14 is a bottom plan view thereof.
Portions of the article shown in broken lines form no part of the claimed design.