| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To perform backup of a power source of an electric power steering device at low cost. <P>SOLUTION: As the power device 40, a power source feeding circuit is constituted by a main power source feeding circuit 50 provided with a high voltage battery 51 and a voltage-descending circuit 55 for descending the voltage of the high pressure battery 51; and a sub-power source feeding circuit 60 provided with a low voltage battery 61 and a voltage-raising circuit 70 for raising the voltage of the low voltage battery 61. The main power source feeding circuit 50 and the sub-power source feeding circuit 60 are connected in parallel and are provided and an output voltage of the sub-power source feeding circuit 60 is set lower than an output voltage of the main power source feeding circuit 50. When the output voltage of the main power source feeding circuit 50 is reduced than a target voltage of the sub-power source feeding circuit 60, the voltage is raised by the voltage-raising circuit 70 to feed the power source to a motor drive circuit 32. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
