| 摘要 |
<p>A motor control system which can realize current detection with high accuracy by using an amplifier (2a) having an ordinary level of accuracy and can avoid deterioration of current detection accuracy even when temperature is changed. The motor control system comprises a switch circuit (10a, 10b, 10c) for supplying a driving current to a motor (17), a resistor (7a, 7b, 7c) for detecting the driving current (8), an amplification circuit (2a) for amplifying the potential difference across the resistor (8), an input section switch unit (15a) disposed in the input section of the amplification circuit (2a) and changing over the potential difference to be forward biased or reverse biased, an output section switch unit (20a) disposed in the output section of the amplification circuit (2a) and changing over the output voltage of the amplification circuit (2a) to be forward biased or reverse biased, and a CPU (50) for averaging the voltage produced when the output voltage of the amplification circuit (2a) is forward biased, and a voltage produced when the output voltage of the amplification circuit (2a) is reverse biased.</p> |
