| 摘要 |
<P>PROBLEM TO BE SOLVED: To sufficiently charge an auxiliary power supply 50. <P>SOLUTION: A power supply control portion 62 calculates a target charge/discharge current made to flow to the auxiliary power supply 50 based on a real charge amount and a target charge amount of the auxiliary power supply 50, and feedback-controls the boosting voltage of a boosting circuit 40 so that the real charge/discharge current detected by an auxiliary current sensor 51 becomes the target charge/discharge current. When the real charge amount is equal to or above the target charge amount, the target charge/discharge current is set to zero and overcharge is prevented. When the real charge amount is below the target charge amount, the target charge current corresponding to an allowance amount of capacity of the boosting circuit 40 is set and the auxiliary power supply 50 is speedily charged. When there is no allowance in output of the boosting circuit 40, the target charge/discharge current is set to zero and power is supplied from the auxiliary power supply 50 only by the lack amount of the capacity of the boosting circuit 40. <P>COPYRIGHT: (C)2012,JPO&INPIT |
