Patent ID: 7740103

Claim:
An electric power steering apparatus comprising: a motor providing a steering force; a step-up voltage apparatus which steps up an applied voltage output by an electric power supply; and a drive control apparatus which drives the motor with a target current based on a steering input by using an output voltage of the step-up voltage apparatus, the drive control apparatus including: a current monitor apparatus which monitors an input current; and a voltage monitor apparatus which monitors the applied voltage, wherein the step-up voltage apparatus outputs a rated step-up voltage to drive the motor, and wherein, when the input current to the step-up voltage apparatus is equal to or higher than a first threshold current set in the step-up voltage apparatus, and a voltage applied to the step-up voltage apparatus is lower than a first threshold voltage set in the step-up voltage apparatus, the step-up voltage apparatus discontinuously switches the output voltage to a voltage lower than the rated step-up voltage.