SWITCHING POWER SUPPLY DEVICE, AND POWER SUPPLY SYSTEM USING THE SAME

To provide a switching power supply device capable of accurately controlling a load terminal voltage by a feed-forward type remote-sensing function, and to provide a power supply system using the same.SOLUTION: A switching power supply device 10 comprises: an output terminal voltage detection part 24 that detects an output terminal voltage Vo of a power conversion part 20, and outputs an output terminal detection voltage Vok=k Vo; a load terminal voltage detection part 26 that detects a load terminal voltage Vf generated at a load terminal 36, and outputs a load terminal detection voltage Vfk=k Vf; a designated voltage information preparation part 28 that, upon designation of a designated Vfs of the load terminal voltage Vf, prepares designated voltage information J(Vsi)[Vsi=k Vfs]; a target voltage information producing part 30 that produces target voltage information J(Vm)[Vm=Vsi+Vok-Vfk] by performing digital calculation processing based on Vok, Vfk and J(Vsi); a target voltage producing part 32 that produces a target voltage Vm based on J(Vm); and a control part 34 that controls the power conversion part 20 so that Vok and Vm are equal to each other.SELECTED DRAWING: Figure 1 【課題】フィードフォワード型のリモートセンシング機能により負荷端電圧を精度よく制御できるスイッチング電源装置及びこれを用いた電源システムを提供する。【解決手段】スイッチング電源装置１０は、電力変換部２０の出力端電圧Ｖｏを検出し、出力端検出電圧Ｖｏｋ＝ｋ・Ｖｏを出力する出力端電圧検出部２４、負荷端３６に発生する負荷端電圧Ｖｆを検出し、負荷端検出電圧Ｖｆｋ＝ｋ・Ｖｆを出力する負荷端電圧検出部２６、負荷端電圧Vfの指定値Ｖｆｓが指定され、指定電圧情報Ｊ（Ｖｓｉ）［Ｖｓｉ＝ｋ・Ｖｆｓ］を作成する指定電圧情報作成部２８、Ｖｏｋ、Ｖｆｋ及びＪ（Ｖｓｉ）を基にデジタル演算処理を行い、目標電圧情報Ｊ（Ｖｍ）［Ｖｍ＝Ｖｓｉ＋Ｖｏｋ－Ｖｆｋ］を作成する目標電圧情報作成部３０、Ｊ（Ｖｍ）を基に目標電圧Ｖｍを生成する目標電圧生成部３２及びＶｏｋとＶｍとが等しくなるように電力変換部２０を制御する制御部３４を備える。【選択図】図１