| 摘要 |
PROBLEM TO BE SOLVED: To secure at least a power supply path to electrical equipment with high importance even if an unexpected power supply abnormality occurs.SOLUTION: A power supply box body circuit 10 includes a +B power side circuit 20 connected to a +B power side input line 11 and an IG power side circuit 30 connected to an IG power side input line 12. In the case where there is an IG1 system relay 36 within the IG power side circuit 30 and there is an IG2 system relay 28 within the +B power side circuit 20, when a failure of the IG2 system relay 28 is detected, a recovery operation in which a power supply path is switched by second relays 42A and 42B for recovery and power is supplied from output of the IG1 system relay 36 to an output side of an IG2 system is performed. In such a case, power supply to a load of a low priority is automatically cut off by switching the second relay 42B for recovery, and supply power is prevented from being lacked.SELECTED DRAWING: Figure 1 |
