| 摘要 |
A power converter includes pairs of series-connected switching elements and, for each pair, a bidirectional switch that clamps the switching elements of the pair at the mid-point of a DC voltage that is supplied to the power converter. An abnormal voltage rise in a forward recovery process of the bidirectional switch is avoided by restraining an induced electromotive force developing across the bidirectional switch upon turning OFF of one of the semiconductor switching elements below the difference in voltage between the gate voltage at the start of the forward recovery process of the bidirectional switch and the gate threshold voltage that allows the maximum recovery current of the bidirectional switch to flow. |
