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 ope...

The emergence of fast-switching wide-bandgap (GaN, SiC) power electronics devices has enabled motor drive systems to achieve high efficiency, density, control bandwidth and high-level integration. However, the speed switching frequency result in an increased level overvoltage at both terminals stator neutral. This increases stress across winding insulation bearings. paper investigates three typ...

In order to analyze the explosion accidents of CRH5 EMU roof arrester in recent years, an internal temperature measuring platform based on fluorescence fiber was established, and distribution characteristics under continuous operating voltage high-current impulse were analyzed. The test results show that passing section overvoltage steep have higher amplitudes, while high-harmonic has a lower a...

The paper presents the results of studying phase composition iron-nickel alloys obtained by unsteady electrolysis. It was found that use a unipolar pulse current leads to significant increase in crystallization overvoltage at front moment action, which affects component coatings. formed cathode differs from shown equilibrium diagram.