| 摘要 |
PROBLEM TO BE SOLVED: To improve the safety of a vehicle by reducing a risk of welding of a contactor and improving detectability at the occurrence of the welding.SOLUTION: A power supply device for a vehicle includes: a positive pole contactor installed in a positive pole line of a high voltage battery and a negative pole contactor installed in a negative pole line of the high voltage battery; and a welding determination part which performs welding determination of the negative pole contactor when a connection signal is output to the positive pole contactor and the negative pole contactor, and performs welding determination of the positive pole contactor when a disconnection signal is output to the positive pole contactor and the negative pole contactor. When the positive pole contactor and the negative pole contactor are switched to a disconnected state during the stop of a traveling motor, a disconnection signal is output to the positive pole contactor and then a disconnection signal is output to the negative pole contactor, and when the positive pole contactor and the negative pole contactor are switched to the disconnected state during the rotation of a traveling motor, a disconnection signal is output to the negative pole contactor (a mark T3) and then a disconnection signal is output to the positive pole contactor (a mark T4). |
