| 摘要 |
<p>A control device (20) that controls an inverter unit (10) generates a voltage command on the basis of a phase detected by a first detection unit, generates a PWM signal (27a) for a first bridge circuit (Q1-Q2) on the basis of the voltage command, and generates a polarity signal (30a) for a second bridge circuit (Q3-Q4) on the basis of a phase detected by a second detection unit. Further, a command value correction unit (26) corrects the generated voltage command to 0V in the course of a first period (26b) that continues from a point of time prior to a zero-cross phase (x1) detected by the first detection unit, and a gate-off control unit (30) sets the polarity signal (30a) to an off state in the course of a second period (30b) that continues from a zero-cross phase (x2) detected by the second detection unit, thereby inhibiting spike voltages from being generated upon changes in the polarity of the output voltage of the inverter unit (10).</p> |
