| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a vehicle power supply system with low power loss capable of easily and surely executing a power supply switching control.SOLUTION: A vehicle power supply system includes: a relay for outputting power by switching a first battery to/from a second battery; a control device that controls a switching operation of the relay, to which the first battery or the second battery is connected so as to be able to supply the power via a first power supply path, an output of the first battery or that of the second battery being selectively connected to the first power supply path by the relay, to which an ignition power supply is connected so as to be able to supply the power via a second power supply path, and to which the second battery is connected so as to be able to supply the power via a third electric power supply path that is continuous so as to back up the power supplied via the second electric power supply path by cutting off the second power supply path if a voltage of the second power supply path falls; and a switching device that cuts off the third electric power supply path that is continuous so as to back up the electric power after predetermined time if an output from the ignition power supply to the second electric power supply path falls to a voltage lower than a preset threshold.</p> |
