Power supply device for vehicle

A power supply device for a vehicle, comprising:

• an electric load that operates at a predetermined low voltage;
• a high-voltage power supply that provides a high-voltage DC power supply by connecting in series a plurality of power storage elements constituting each node that supplies the predetermined low voltage;
• a plurality of switch means provided corresponding to the each node that supplies the predetermined low voltage to the electric load;
• a control means, wherein the control means supplies a voltage by turning on one of the switch means for supplying the voltage from at least one node and turning off the other switch means for supplying the voltage from the other nodes, and after setting a dead time period to turn off all the switch means once, by sequentially repeating turning on a next one of the switch means of a next node that supplies the voltage next and turning off the other switch means that supply the voltage from the other nodes so that the voltage is supplied from all the storage elements;
• and
• a leakage detection means that detects a leakage current between the high-voltage power supply and a ground potential and sends a signal to the control means,
• wherein the control means determines the signal sent from the leakage detection means during the dead time period in which all of the plurality of switching means are in an off state, and maintains the off state of all of the switching means for a predetermined period of time in a case where the leakage current is equal to or higher than a predetermined current.