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The paper assesses the potential of employing super-junction MOSFETs in a high efficiency and low cost bidirectional DC-DC converter for application in electric vehicle systems. Super-junction MOSFETs have a very low conduction loss, however, their poor intrinsic diode recovery behaviour and high output capacitances means that switching losses can be high in voltage source converters. A drain current...
The use of silicon carbide (SiC) semiconductor power devices has been studied and evaluated in a wide variety of converters. The work presented in this paper shows the performance of C2M SiC MOSFETs compared to Si devices operating as switching elements in a 5-level, single phase, multilevel converter. The paper describes the multilevel converter platform used to undertake the evaluation study and...
Three phase squirrel-cage induction motors hardly reaches IE4 efficiency class requirements. On the other hand, line-start synchronous motors can achieve the IE4 class and they are candidates to meet the IE5 class. Due to the presence of rare-earth permanent magnets, line start motors are more expensive than standard induction motors. This paper presents a per-unit FE analysis of the steady state...
This paper presents a new hybrid VSC topology (the Star-Switched MMC) - suitable for HVDC applications. The basic structure and operating principles of the topology are described. Control strategies that regulate the power exchanged between the VSC, the AC network and the DC network are presented. A modulation strategy ensuring appropriate switching of the individual chain-link sub-modules and a capacitor...
Electrical motors and drives are the driving force in industry and economy. Continuous improvement of their efficiency is critical to reduce CO2 emissions; however, accurate measurement of their power losses poses a particular challenge. At present, it relies on input-output methods to test permanent magnetic (PM) machine drives and power electronics, which proved to lack precision for highly efficient...
This paper presents a high-efficiency quasi Z-source inverter with discontinuous input current deploying super-junction MOSFETs as bridge devices to minimise losses. Z-source inverters and quasi Z-source inverters can accommodate two major challenges exhibited by super-junction MOSFETs which would normally make their use problematic in traditional voltage source converters. Firstly, the intrinsic...
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