| 摘要 |
In an optical disc player, as signals are read from and written to an optical disc, the optical disc is rotated by a spindle motor and an optical pickup is moved by a sled motor. These motors are both direct-current motors. The motor control circuit of the invention uses a drive circuit based on the BTL method, and additionally uses a resistor that is connected in series with the direct-current motor between the output terminals of the drive circuit. The voltage drop across the resistor is fed back, as positive feedback, to the drive circuit through a feedback amplifier. Since, when the motor is started up, a high current flows through the motor and thus a large voltage drop occurs across the resistor, a high feedback voltage is obtained and thus a high drive voltage is applied to the motor.
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