| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a motor drive circuit capable of improving controllability of the number of rotations of a motor. <P>SOLUTION: A motor drive circuit comprises: a first port receiving a rotation command signal that defines the number of rotations of a motor; a first measuring circuit measuring the rotation command signal; a second port receiving a first setting signal; a second measuring circuit measuring the first setting signal; a duty calculation circuit calculating duty corresponding to the measured rotation command signal on the basis of characteristics defining the relationship between the rotation command signal and a PWM signal, and outputting a duty information signal according to the calculated duty; and a motor-drive-waveform control circuit generating the PWM signal having the calculated duty on the basis of the duty information signal and outputting the signal. <P>COPYRIGHT: (C)2013,JPO&INPIT |
