VEHICLE POWER SUPPLY

To provide a vehicle power supply capable of preventing discharge of a capacitor installed on a connection path between a power supply inside a vehicle and a charging port of a DC power supply.SOLUTION: The vehicle power supply includes: a quick charging port 9 to which a DC power supply 10 is connected; capacitors 31, 32, 33, connected between a positive electrode and a negative electrode of the quick charging port 9; an electrical load 4 connected to a battery 51; a first switch 11 for opening and closing a connection path between a positive electrode of the quick charging port 9 and the capacitors 31, 32, 33; a second switch 12 for opening and closing a connection path between a negative electrode of the quick charging port 9 and the capacitors 31, 32, 33; a first diode 21 for passing a current in a direction from the positive electrode of the quick charging port 9 toward the capacitors 31, 32, 33; and a second diode 22 for passing a current from the capacitors 31, 32, 33 toward the negative electrode of the quick charging port 9. The first diode 21 is connected in parallel with the first switch 11. The second diode 22 is connected in parallel with the second switch 12.SELECTED DRAWING: Figure 2 【課題】車両内部の電源と直流電源の充電口との接続経路上に設置されたキャパシタが放電することを防止することができる車両用電源装置を提供すること。【解決手段】直流電源１０が接続される急速充電口９と、急速充電口９の正極と負極との間に接続されるキャパシタ３１、３２、３３と、バッテリ５１と接続される電装負荷４と、急速充電口９の正極とキャパシタ３１、３２、３３との接続経路を開閉する第一スイッチ１１と、急速充電口９の負極とキャパシタ３１、３２、３３との接続経路を開閉する第二スイッチ１２と、急速充電口９の正極からキャパシタ３１、３２、３３の方向に電流を流す第一ダイオード２１と、キャパシタ３１、３２、３３から急速充電口９の負極の方向に電流を流す第二ダイオード２２と、を備え、第一ダイオード２１は第一スイッチ１１と並列に接続され、第二ダイオード２２は第二スイッチ１２と並列に接続される。【選択図】図２