| 摘要 |
PROBLEM TO BE SOLVED: To provide a motor-driven power steering system that suppresses noise harmful to peripheral equipment. SOLUTION: This motor-driven power steering system assists a driver's steering force by conducting a current corresponding to the driver's steering force detected by a torque sensor 1 to a motor 2 by controlling a bridge circuit 31. In this power steering system, inductance elements 311, 312 are inserted in series to the source of field-effect transistors constituting the bridge circuit 31 that controls the motor 2. At the same time, a control voltage of the bridge circuit 31 is added to obtain a gate drive voltage of the field-effect transistors, by using the electric potential of the opposite-to-source end of the inductance elements 311, 312 or the electric potential in the middle of the inductance elements 311, 312 as a reference. COPYRIGHT: (C)2008,JPO&INPIT |
