To provide a vehicular power supply device which improves the safety and reliability of a vehicle and suppresses an increase in manufacturing costs.
A vehicular power supply device includes a DC/DC converter 11 which supplies power to vehicular loads classified into first and second loads 13 and 15 of which operation necessity is high during traveling of a vehicle and a third load 14 of which operation necessity is low during traveling of the vehicle, an auxiliary battery 12, a cable C1 connecting the first load 13 to the auxiliary battery 12, a cable C2 connecting the second and third loads 15 and 14 to the DC/DC converter 11, a fuse F0 connecting the cable C1 to the cable C2, and relays R1 and R2 which when the fuse F0 is cut by fusing, connect the second load 15 to the cable C1 and disconnect the second load 15 from the cable C2.
SHIINA MIKIO
MAKI HIDETAKA
NISHIOKA FUTOSHI
ANRAKU FUMIO
Yoshifumi Saeki
Mitsuo Teramoto
Suzuki Mitsuyoshi
Shingo Suzuki