| 摘要 |
<P>PROBLEM TO BE SOLVED: To start up a motor without confirming generation of PWM and to quietly and surely perform the start-up. <P>SOLUTION: A motor start-up circuit includes a counter 3 for counting the number of Hall pulses to be externally inputted after being reset by power supply. As motor drive signals, PWM signals of a duty 100% are outputted until the counter 3 counts a prescribed number of the Hall pulses, and controlled PWM signals are outputted when the counter 3 counts the prescribed number of the Hall pulses. <P>COPYRIGHT: (C)2012,JPO&INPIT |
