Power supply device

A power supply device (5) is disclosed. The power supply device (5) includes: an auxiliary power supply (41) of a main power supply (6) that supplies power to a power supply target including a control system circuit (52) for controlling a specific control target and a power system circuit (51) that requires greater power than the control system circuit (52); and a selection circuit configured to supply power from one of the main power source (6) and the auxiliary power source (41) having the higher voltage to at least a circuit (52) of the control system in the power supply targets. 公开了一种电源装置(5)。该电源装置(5)包括：向供电目标供电的主电源(6)的辅助电源(41)，供电目标包括用于控制特定控制目标的控制系统的电路(52)以及动力系统的电路(51)，动力系统的电路(51)需要比控制系统的电路(52)大的电力；以及选择电路，其被配置成将来自主电源(6)和辅助电源(41)中的具有较高电压的一个电源的电力供应给供电目标中的至少控制系统的电路(52)。