| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent leakage current by suppressing the generation of a common mode voltage in a motor controller for converting a DC voltage into an AC voltage by switching and applying the AC voltage to an AC motor. <P>SOLUTION: If the phase voltages of three-phase AC voltages converted by a PWM inverter are all at H levels or L levels, the DC voltage lower than the DC voltage supplied to the PWM inverter is supplied to the PWM inverter in the case of the state that all the phase voltages are not at an H level and the state that all the phase voltages are not at an L level. <P>COPYRIGHT: (C)2004,JPO&NCIPI |
