| 摘要 |
PURPOSE:To obtain an electric motor drive device which can achieve a highly accurate control without being affected by an offset current caused by temperature change. CONSTITUTION:An output voltage of a power conversion circuit 45 is detected by a voltage-detection circuit 11 and an error voltage corresponding to a difference between the output voltage and an output voltage of a DA converter 41 is generated. A digital current value which is an output of an AD converter 47 is latched at a zero-cross point of the error voltage and then the latch current value is subtracted from an output value of the AD converter, thus enabling the offset to be eliminated. |
