| 摘要 |
A power switching device which decreases both surge voltage and switching loss. As the inductor is connected to the emitter electrode of the IGBT element, the potential of the emitter electrode changes in the direction in which the IGBT element maintains the ON state with the attenuation of the main current when the IGBT element turns OFF from ON. Furthermore, as the inductor is included in the path of the OFF driving current for bringing the IGBT element to OFF, the OFF driving current once raises and then decreases. As a result, because the transition from ON to OFF calmly proceeds, the occurrence of the surge voltage is suppressed. On the other hand, since the inductor is not included in the path of the ON driving current, the transition from OFF to ON of the IGBT element is rapidly made. Accordingly, the switching loss occurring in the transition period is decreased. The decrease in the surge voltage and the decrease in the switching loss are compatibly realized.
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