| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a vehicular power supply device which can maintain normal operation of an electric load group with high priority even when one voltage conversion part fails without increasing power supply capacity of the voltage conversion part.SOLUTION: A vehicular power supply device 30 includes a first voltage conversion part 31 and a second voltage conversion part 32 for performing voltage conversion on power inputted from a power supply 13 to output it. A control circuit 40 switches a changeover part 60 into a first changeover state at the time of non-failure of the second voltage conversion part 32, and switches the changeover part 60 into a second changeover state at the time of failure of the second voltage conversion part 32. The vehicular power supply device 30 also includes a first bypass relay 33 and a second bypass relay 34. The control circuit 40 switches the first bypass relay 33 into the bypass state at the time of failure of the first voltage conversion part 31 and switches the second bypass relay 34 into the bypass state at the time of failure of the second voltage conversion part 32.</p> |
