POWER SUPPLY DEVICE

To provide a power supply device capable of flowing an appropriate current through paths arranged in parallel.SOLUTION: A power supply unit U comprises: a first conductor portion 31 and a second conductor portion 32 which are provided in parallel to each other in an electric path L1 electrically connecting a lead storage battery and a rotary electric machine; a switch SW1 which has a first switch portion 41 and a second switch portion 42 comprised of semiconductor switching elements and connected together in parallel by the first conductor portion 31 and the second conductor portion 32; and first and second generation circuits 52 and 62 which generate a voltage applied to each of gate terminals 43a of the first switch portion 41 and the second switch portion 42. The resistance value of the first conductor portion 31 is higher than the resistance value of the second conductor portion 32, and a first voltage applied to the gate terminal 43a of the first switch portion 41 is higher than a second voltage applied to the gate terminal 43a of the second switch portion 42.SELECTED DRAWING: Figure 2 【課題】並列に配された経路に適切な電流を流すことができる電源装置を提供する。【解決手段】電源ユニットＵは、鉛蓄電池と回転電機との間を電気的に接続する電気経路Ｌ１において、互いに並列に設けられた第１導体部３１及び第２導体部３２と、半導体スイッチング素子よりなり第１導体部３１及び第２導体部３２により並列接続された第１スイッチ部４１及び第２スイッチ部４２を有するスイッチＳＷ１と、第１スイッチ部４１及び第２スイッチ部４２の各ゲート端子４３ａに印加する電圧を生成する第１、第２生成回路５２、６２と、を備える。第１導体部３１の抵抗値が第２導体部３２の抵抗値より高くなっており、第１スイッチ部４１のゲート端子４３ａに印加される第１電圧が、第２スイッチ部４２のゲート端子４３ａに印加される第２電圧より高い。【選択図】図２