IGBT Overvoltage Protection Based on Dynamic Voltage Feedback and Active Clamping

In view of the stability unmanned aerial vehicle (UAV) power system, this paper found that voltage spike generated by IGBT mainly occurs when is turned off in study system interior and drive overvoltage protection, an excessive will lead to damage. To eliminate serious threat safe operation circuit, protection circuit combining dynamic feedback active clamping proposed. method, circuits are operated alternately, controlled capacitor’s rise rate. The gate current output directly compensated control signal delay gate, combined with improving lifting effect clamp on suppressing peak turn-off voltage. According turn process, SABER simulation, finally builds experimental prove proposed method suppresses size spike, further analyzes key parameters suppression thereby ensuring IGBT, UAV system.