Aviation　electromagnetic　transmitters　are　used　to　ascertain　the　distribution　and　reserves　of　underground　mineral　resources.　Among　them,　the　launch　subsystem　is　used　as　the　energy　source　of　helicopter　aviation　transient　electromagnetic　exploration　equipment,　and　its　performance　will　have　a　great　impact　on　the　exploration　depth　and　accuracy　of　mineral　resources.　The　structure　and　principle　of　the　power　conversion　circuit　of　the　transmitting　subsystem　are　introduced.　Complete　the　production　of　the　power　conversion　circuit,　and　complete　the　test　of　several　main　performance　indicators　of　the　circuit.　Laboratory　test　results　show　that　the　power　conversion　circuit　has　good　performance　and　meets　the　design　requirements.　©　2021　Institute　of　Physics　Publishing.　All　rights　reserved.