| 摘要 |
PROBLEM TO BE SOLVED: To reduce the noise of a compact DC brushless motor used in a room or the like. SOLUTION: This driving circuit of a motor has a voltage control means that chops a DC power supply for efficiently generating ±supply voltages, and the output voltage of the voltage control means is applied as the supply voltage for a coil-driving circuit according to a speed signal from the motor. Also, a bias voltage corresponding to voltage being applied to the coil-driving circuit is applied to a Hall element, and the output of the Hall element is amplified for applying it to a motor coil, thus preventing the distortion of a current waveform in communication. |
