| 摘要 |
PURPOSE:To prevent switching noise when controlling a minute current. CONSTITUTION:The PWM motor drive circuit is provided with a motor current detection circuit 38, an operation circuit 31 for calculating the difference between motor current value and motor current indication value, a PWM converter 32 for generating a pulse train with a duty corresponding to the differential output from the operation circuit, a first drive pulse generation circuit 33 for generating the drive pulse for drive motor based on the pulse train, a second pulse generation circuit 34 for generating the drive pulse for regeneration mode, and a motor drive circuit 39 for performing drive mode operation and regeneration mode operation. It is also configured to be provided with a comparison circuit 35 for comparing a motor current value and a motor current indication value and a switching circuit 36 for switching to a regeneration mode when the motor current value is larger the motor current command value by a specific value or more in drive mode. |
