POWER SUPPLY SYSTEM AND POWER SUPPLY DEVICE

To provide a power supply system and a power supply device which have high reliability.SOLUTION: A power supply system 1 includes at least two power supply devices 10 which supply electric current to one load 70. A power supply device 10 is provided with: a converter 20 which supplies electric current to the load 70; an FET 40 connected in series between the converter 20 and the load 70; current detecting means Rs which detects electric current which flows between the converter 20 and the load 70; and a drooping characteristic control unit 32 which droops output voltage of the converter 20 at a droop rate determined based on magnitude of load current which flows from the converter 20 to the load 70. A droop rate in the case where load current is included in a first current section is larger than a droop rate in the case where load current is included in each of a second current section and a third current section. The second current section includes electric current smaller than electric current included in the first current section. The third current section includes electric current larger than electric current included in the first current section.SELECTED DRAWING: Figure 5 【課題】高い信頼性を有する電源システム及び電源装置を提供する。【解決手段】電源システム１は、１つの負荷７０に対して電流を供給する、少なくとも２台の電源装置１０を含む。電源装置１０は、電流を負荷７０に供給するコンバータ２０と、コンバータ２０と負荷７０との間に直列に接続されているＦＥＴ４０と、コンバータ２０と負荷７０との間に流れる電流を検出する電流検出手段Ｒｓと、コンバータ２０から負荷７０に向かって流れる負荷電流の大きさに基づいて決定される垂下率でコンバータ２０の出力電圧を垂下させる垂下特性制御部３２とを備える。負荷電流が第１電流区間に含まれる場合の垂下率は、第２電流区間及び第３電流区間それぞれに負荷電流が含まれる場合の垂下率よりも大きい。第２電流区間は、第１電流区間に含まれる電流より小さい電流を含む。第３電流区間は、第１電流区間に含まれる電流より大きい電流を含む。【選択図】図５