| 摘要 |
<p>A PWM inverter device comprises: a bridge circuit in which switching elements (Q1 to Q4) are alternately PWM-driven; a plurality of snubber circuits connected between both ends of each of the switching elements (Q1 to Q4) and configured with series circuits of snubber capacitors (Cs1 to Cs4) and discharge blocking diodes (D1 to D4); a first regeneration circuit connected between the snubber circuits and a power supply and configured with a series circuit of a regeneration switching element (Q5) and a reactor (Lf1) for regenerating, by resonating with the snubber capacitors (Cs1, Cs4) of the respective snubber circuits, the electric charge charged on these capacitors into the power supply; a second regeneration circuit configured with a series circuit of a regeneration switching element (Q6) and a reactor (Lf2) for regenerating, by resonating with the snubber capacitors (Cs2, Cs3) of the respective snubber circuits, the electric charge charged on these capacitors into the power supply; and a control circuit (CT) for controlling the switching elements (Q1 to Q4) to turn on or off.</p> |
