| 摘要 |
A main power supply and an auxiliary power supply for supplying power to a motor are provided. A MOS-FET for supplying power from the main power supply and a MOS-FET for supplying power from the main and auxiliary power supplies are provided. When a phenomenon in which a rotor of a motor is rotated by the going-back force of steered wheels occurs, and voltage VG of power generated by the motor satisfies the relation VG>VB+VC where VB is a voltage of the main power supply and VC is a voltage of the auxiliary power supply, a control circuit and a gate drive circuit turn off both MOS-FETs so as to charge the auxiliary power supply using the voltage VG through a parasitic diode of the MOS-FET.
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