H.L.N. Wiegman

TL;DR: In this article, the authors proposed a new charge equalization technique for a series string of battery cells, which utilizes a simple isolated DC-to-DC power converter with a capacitive output filter along with a multiwinding transformer.

TL;DR: In this article, the authors proposed a new charge equalization technique for a series string of battery cells, which utilizes a simple isolated DC-to-DC power converter with a capacitive output filter along with a multi-winding transformer.

TL;DR: In this paper, the authors proposed a new charge equalization technique for a series string of battery cells, which utilizes a simple isolated dc-to-dc converter with a capacitive output filter along with a multiwinding transformer.

TL;DR: In this article, a load side resonant, high power density, DC-to-DC converter is proposed, which is based on a half-bridge topology with zero voltage switching (ZVS) characteristics.

Abstract: This paper reports on the experimental and theoretical performances of insulated gate bipolar transistor (IGBT) characteristics at elevated temperatures when used in soft- and hard-switching converters. It is shown that di/dt-dependent turn-on voltage spike and dynamic forward voltage saturation occur due to conductivity modulation lag in the drift region. During turn-off, temperature- and dv/dt-dependent elevated current waveforms were measured that are caused by the minority carrier storage and recombination in the drift region of the device. The measured data is shown to be in excellent agreement with the simulated results over the entire range of dv/dt, di/dt and temperature variations. The simulations were performed using an advanced mixed device and circuit simulator in which device carrier dynamics was studied under boundary conditions imposed by circuit operation. >