| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a driving control device for brushless motors which is capable of suppressing vibration and noise at the time of phase changeover with a relatively-simple circuit configuration with efficiency. <P>SOLUTION: A driving control device 1 has an inverter circuit 5, a motor driving circuit 6, a motor controller 7, and a rotation position detector 8. In an overlapping period, a first PWM signal is supplied, and a second PWM signal having a higher frequency than the first PWM signal is supplied to an upper arm side switching element to which the first PWM signal is supplied immediately before the overlapping period in an on-period of a switching element for a phase to be switched next, thereby, upper arm side switching elements for two phases are turned on simultaneously. In the overlapping period, a third PWM signal having a higher frequency than the first PWM signal is supplied to a lower arm side switching element to which a constant voltage signal is supplied immediately before the overlapping period, thereby, lower arm side switching elements for two phases are turned on simultaneously. <P>COPYRIGHT: (C)2012,JPO&INPIT |
