| 摘要 |
The device comprises a full bridge circuit (1) and an electronic control and driving unit (ECU) arranged to drive the upper switches (Q1-Q3) and the lower switches (Q1'-Q3') of the bridge circuit (1) in operation with respective sets of three driving signals (SQ1, SQ2, SQ3; SQ1', SQ2', SQ3') which are offset relative to one another by about 180 electrical degrees, each set of three comprising three driving signals (SQ1, SQ2, SQ3; SQ1', SQ2', SQ3') which are offset relative to one another by about 120 electrical degrees and each of which comprises an active portion that extends through about 120 electrical degrees, alternating with an inactive or de-activation portion that extends through about 240 electrical degrees. Each active portion of each driving signal (SQ1, SQ2, SQ3; SQ1', SQ2', SQ3') of each set of three has an initial pulsed activation period (I i ), an intermediate continuous activation period (I M ), and a final pulsed activation period (I f ), the intermediate continuous activation period (I M ) having an extent in electrical degrees greater than that of each pulsed activation period (I i , If). |
