| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an electric power steering device capable of saving the energy of an auxiliary power supply and using the auxiliary power supply efficiently. <P>SOLUTION: A control circuit 2 obtains a command value of a driving voltage supplied to a motor driving circuit 6, based on an actual current flowing through a motor 5 and a target current. When the command value exceeds the previous value as a lower limit which is a limit value of supply from a battery 7, a discharge amount of the auxiliary power source 10 is controlled by increasing or decreasing the duties of switching elements 12, 13 in accordance with the difference. <P>COPYRIGHT: (C)2010,JPO&INPIT |
