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Dynamic Voltage Rise Control, the Most Efficient Way to Control Turn – off Switching Behaviour of IGBT Transistors

The main challenge for most engineers working in the power electronic field is to design a converter with an efficiency close to one. As far as only hard switching is considered, this idea requires that the device be applied as a current switch with transition times as short as possible and with low collector–emitter saturation voltage. Therefore, the use of Trench-/Field-Stop technology in IGBTs enabled a significant reduction in on-state voltage without increasing turn-off losses. The turn-off losses of these IGBTs are at least as low as previous generations, but the waveforms observed at turn-off, under some conditions, can cause severe concerns for the inverter design. For turn-off at high DC-link voltage, high current and low temperature either UCE overvoltages or oscillations of the collector current limit the useful range of operation. Problems are especially severe if the parallel connection of IGBTs is applied

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• 2014/02/07