| 摘要 |
<P>PROBLEM TO BE SOLVED: To excellently perform charging of an auxiliary power supply device 50. <P>SOLUTION: A power supply control unit 62 calculates target charge/discharge current to flow to an auxiliary power supply device 50, based on the actual and target amounts of charge of the auxiliary power supply device 50. Then feedback controls are performed for boost voltage of a booster circuit 40 so that actual charge/discharge current detected by an auxiliary current sensor 51 satisfies the target charge/discharge current. In which case, when the actual amount of charge is equal to or more than the target amount of charge, overcharge is prevented by setting the target charge/discharge current to 0. When the actual amount of charge is less than the target amount of charge, the target charge/discharge current is set according to a capability allowance of the booster circuit 40 to promptly perform charging of the auxiliary power supply device 50. When the booster circuit 40 has no output allowance, the target charge/discharge current is set to 0 to supply the power from the auxiliary power supply device 50 only for insufficient capability of the booster circuit 40. <P>COPYRIGHT: (C)2012,JPO&INPIT |
