POWER SUPPLY DEVICE

摘要

Disclosed is a power supply device comprising: a first electrical storage unit and a second electrical storage unit which are connected in parallel with a load; a main switching circuit which is arranged on a current passage that connects the first electrical storage unit to the second electrical storage unit and which can switch between a passage-disconnected state and a passage-connected state; and a potential difference adjustment circuit which has a first switching circuit and a second switching circuit that are connected to each other in series and which is connected to the main switching circuit in parallel with each other. In the power supply device, the first switching circuit has at least one first semiconductor switching element that incorporates a body diode in the direction of the blocking of a current flowing from the first electrical storage unit toward the second electrical storage unit, the second switching circuit has at least one second semiconductor switching element that incorporates a body diode in the direction of the blocking of a current flowing from the second electrical storage unit toward the first electrical storage unit, and a control unit is additionally provided to the power supply device, wherein the control unit can control the first and second semiconductor switching elements so that the potential difference between the first electrical storage unit and the second electrical storage unit can be reduced and can also switch between the passage-disconnected state and a passage-connected state of the main switching circuit after the potential difference has been reduced.