| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a power-supply device operation circuit capable of reducing a reverse current and preventing failures of a power-supply device internal circuit and the like. <P>SOLUTION: A power-supply device operation circuit connected between a power-supply device and a device load and adapted to control power supply includes first and second ORing transistors which are connected in parallel to a current pathway for connecting the power-supply device and the device load and controlled to be in an OFF state from an ON state in accordance with first and second control signals, respectively; a monitor part for monitoring the amount of current flowing in the current pathway; and a detection circuit for changing the first ORing transistor from the ON state to the OFF state by the first control signal when the current flowing in the current pathway becomes a first value according to a monitoring result from the monitor part and for changing the second ORing transistor from the ON state to the OFF state by the second control signal when the current flowing in the current pathway becomes a second value smaller than the first value. <P>COPYRIGHT: (C)2012,JPO&INPIT |
