| 摘要 |
In this device, a switch-over of the main transistor from the saturated to unsaturated state is to be specified in order to be able to turn it off more quickly out of the unsaturated state than this would be possible in the saturated state. This is achieved by the fact that a number of prestage transistors (T11, T12; T11a, T12a) are provided, by which, before the main transistor (T1) is turned off, the other ones are turned off by one of the prestage transistors (T12; T11a). <IMAGE>
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