| 摘要 |
<P>PROBLEM TO BE SOLVED: To accurately detect a current in the case of performing small duty control in PWM control. <P>SOLUTION: A drive signal Vb in PWM control is outputted in a time (t1+t4) where a specified time t4 is added to an output time t1 geared to the duty based on a command, and a reverse drive signal (-Vb) is outputted in the added time t4 thereby offsetting the increment of the drive signal. It can detect a current for stable waveform where a measure of time has passed so that the disorder occurring in the early stage of current waveform may be settled by outputting the drive signal in an increased time, whereby it can detect a current accurately, so it can perform PWM control excellent in responsiveness by the duty based on an original command. <P>COPYRIGHT: (C)2007,JPO&INPIT |
