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Asymmetric H-bridge converter is widely used for feeding a switched reluctance machine (SRM). This paper discusses a method to estimate the losses in the power devices in such type of converters, where average torque control or square current injection is employed. This paper presents the cooling system design for a silicon carbide (SiC) based asymmetric H-bridge converter. The SiC MOSFETs and the...
Isolated DC-DC conversion with high power density is widely achieved by DC to high-frequency AC conversion, followed by isolation and high frequency rectification. Selection of high-performance diodes for such high-frequency rectification is challenging as a trade-off is often required among numerous conflicting parameters. Three high performance diodes, namely, an ultra-fast silicon diode, a super...
In this paper focus is to study various transition sub-intervals of an IGBT during switching events. The relationship of these transition duration with the switching voltage, device current and junction temperature is studied experimentally. This study is further extended to understand the effect of these time duration deciding the dead time between the switching of positive and negative devices in...
In this paper the focus is to study the switching characteristic of antiparallel diode in an IGBT module. The switching characteristic parameters reverse recovery time, peak reverse recovery current and corresponding energy loss during the diode turn-off transition are studied experimentally. The relationship of these characteristic parameters with the operating conditions, namely, switching voltage,...
In traction applications, power electronic converters experience wide variation in DC link voltage during operation. The purpose of this paper is to study the variations in turn-on and turn-off switching energy losses in the IGBTs with the DC link voltage. The IGBT switching characteristics are measured at various operating conditions, and turn-on and turn-off switching energy losses are determined...
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