SHIELD STRUCTURE FOR ON-VEHICLE POWER CONVERSION DEVICE, AND ON-VEHICLE POWER CONVERSION DEVICE

To provide a shield structure for an on-vehicle power conversion device capable of further reducing a noise while improving heat radiation performance.SOLUTION: A shield structure for an on-vehicle charging device 1 comprises: a wiring board 20 on which a first ground 21 and a second ground 22 insulated from each other are formed, and that mounts an insulation type DC-DC converter circuit 5 including an FET 25 and converting and outputting an input voltage; a shield member 30 provided so as to cover the FET 25 and that has conductivity; a housing 10 that houses the wiring board 20 and has conductivity; a first heat radiation member 41 interposed between the FET 25 and the shield member 30 and that has an insulation property; and a second heat radiation member 42 interposed between the shield member 30 and the housing 10 and that has an insulation property. The first ground 21 is electrically connected with the housing 10. The second ground 22 is electrically connected with the shield member 30, and is connected with a ground electrode of the FET 25.SELECTED DRAWING: Figure 1 【課題】放熱性能を向上させつつ、ノイズをより低減することが可能な車載用電力変換装置のシールド構造を提供する。【解決手段】車載用充電装置１のシールド構造は、互いに絶縁された第１グランド２１、第２グランド２２が形成されるとともに、ＦＥＴ２５を含み、入力電圧を変換して出力する絶縁型ＤＣ−ＤＣコンバータ回路５が実装された配線基板２０と、ＦＥＴ２５を覆うように設けられた導電性を有するシールド部材３０と、配線基板２０を収納する導電性を有する筐体１０と、ＦＥＴ２５とシールド部材３０との間に介装された絶縁性を有する第１放熱部材４１と、シールド部材３０と筐体１０との間に介装された絶縁性を有する第２放熱部材４２とを備える。第１グランド２１は筐体１０と電気的に接続されており、第２グランド２２はシールド部材３０と電気的に接続されるとともに、ＦＥＴ２５のグランド電極と接続されている。【選択図】 図１