| 摘要 |
<p>Provided is a sub control system power line (81) which supplies power from a sub power device (50) to an electronic control device (60). When a main power voltage v1 has become a main power judgment voltage v1 or below, a power control unit (62) turns ON/OFF a voltage drop switching element (82) so as to supply power from the sub power device (50) to the electronic control device (60). When a sub power voltage v2 has become a sub power judgment voltage v2 ref or below, a sub power relay (51) is turned OFF and power supply from the sub power device (50) to a motor drive circuit (30) is stopped while power supply to the electronic control device (60) is continued. This prevents reset of a microcomputer of the electronic control device (60) by power voltage drop.</p> |
