method for einschaltregelung of igbts and device to implement the procedure

摘要

The method is applied to an IGBT (1) with an inverse-parallel free-wheel diode (5). The gate electrode (6) is driven by a voltage-controlled current source (2) receiving the output from a differential amplifier (4) which compares the gate voltage with the waveform of a rising-voltage function generator (3). The control assimilates the load current during the switching-on process to a predetermined trajectory, without actually measuring it. The voltage rises first to the threshold of the IGBT, then to a value corresponding to the full load current, and finally to the maximum gate voltage.