POWER SUPPLY DEVICE

摘要

A power supply device comprises: a power supply; a DC/DC converter equipped with upper and lower arm switching elements connected in series between the positive and negative electrodes of the power supply and a reactor; a first normally closed switch provided between the lower arm switching element and the negative electrode of the power supply; a power supply fuse provided between the positive electrode of the power supply and the other end of the reactor; a second power supply fuse connected in parallel with the power supply fuse; a second normally open switch connected in series with the second power supply fuse and in parallel with the power supply fuse; and a control device for, when detecting a short-circuit failure of the lower arm switching element, opening the first switch and closing the second switch.