| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a power supply device provided with a means for continuing conduction of a relay of a main power supply even when voltage drop momentarily occurs due to a temporary load increase. <P>SOLUTION: The power supply device is provided with a control means, which switches between the main power supply and a sub-power supply, between a main power supply feed line and a sub-power supply feed line, between a main power supply relay and a sub-power supply relay, and between conduction and cut-off of the main power supply relay and that of the sub-power supply relay, and a main power supply state detection means for detecting abnormalities of the power supply state in the main power supply feed line. The control means executes a first fail-safe control law, in which the power supply to the load is continuously executed via the main power supply feed line when detecting the abnormalities of the power supply state in the main power supply feed line, and a second fail-safe control law in which the power supply from the main power supply feed line to the load is cut off, and also, the power supply to the load is started via the sub-power supply feed line when a prescribed period of time elapses after the first fail-safe control law is executed. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
