In　magnetically　coupled　wireless　charging　systems　for　electric　vehicles,　it　is　common　for　metal　objects　to　enter　the　charging　system.　In　this　case,　the　strong　magnetic　field　of　wireless　charging　causes　an　eddy　current　effect　in　the　metal　object,　which　generates　a　large　amount　of　heat.　This　heat　accumulation　poses　a　risk　of　fire.　In　this　paper,　a　novel　metal　object　detection　system　designed　for　wireless　charging　of　electric　vehicles　is　proposed.　The　system　utilizes　the　principle　that　the　coil　impedance　and　coupling　coefficient　change　with　the　presence　of　metal　objects,　and　a　set　of　composite　coils　is　designed　to　improve　the　sensitivity　of　detection.　The　detection　coil　and　feedback　coil　in　the　composite　coil　are　decoupled　by　reverse　series　connection.　An　LC　oscillating　circuit　based　on　transformer　feedback　is　used　to　detect　metal　objects,　and　the　circuit　can　make　good　use　of　the　parameter　changes　of　the　composite　coil.　Finally,　an　experimental　platform　for　wireless　charging　metal　detection　in　electric　vehicles　has　been　built　to　validate　the　proposed　system.　Through　testing,　it　has　been　demonstrated　that　the　system　can　detect　the　presence　of　metal　objects　in　a　timely　and　accurate　manner.　©　2024　Author(s).