Experimental Comparison of a Direct Matrix Converter Using Si IGBT and SiC MOSFETs

Abstract

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Experimental Efficiency Comparison Between a Direct Matrix Converter and an Indirect Matrix Converter Using Both Si IGBTs and SiC <sc>mosfet</sc>s

“…For comparison purposes, both the IMC and DMC prototypes were modulated using an identical, symmetrical space vector modulation (SVM) scheme as described fully in [22] and [23]. This uses 4 active vectors and 3 different null vectors during each switching period (T p ) with a converter switching frequency (F sw =1/T p ) [20], this method results in there being 12 hard commutations per switching period for both types of converter. Table II shows the modulation scheme in more detail for each converter where the hard and soft commutations are highlighted using red and blue lines respectively.…”

“…Accordingly the models are further developed to use data based on average values found during experimentation; this model is similar to [25]- [27] and it does not consider the effect of dead time and the commutation delay time on the conduction losses since this is a very small part of the conduction period for any particular switch. For the DMC the complete analysis is done in [20] so it is not reported here.…”

“…An earlier paper [20] reported a comparison between the use of Si IGBTs and SiC MOSFETS when employed in the DMC topology and operated under the same conditions. Another paper [21] focused on an efficiency comparison of the DMC versus the IMC using Si devices.…”

Experimental comparison of devices thermal cycling in direct matrix converters (DMC) and Indirect Matrix Converters (IMC) using SiC MOSFETs

“…The losses in a MC are not function of the modulation index (ratio between output/input voltages), but only of the output current [9]. In an IMC the losses are also function of the modulation index and the type of modulation used.…”

“…Hence the use of SiC devices can lead to a reduction in the input filter weight and volume for a given input power quality as well as improvements in converter efficiency, which in turn leads to reduced heat sink size and weight. Some scientific papers, which consider the design and construction of DMCs [7]- [9] and IMCs [10]- [12], in particular utilizing SiC JFETs and SiC MOSFETs [11], have recently appeared in scientific literature. Moreover in [5] authors report an experimental comparison of the two Matrix Converter topologies using traditional Si IGBTs and diodes based on the converters efficiency.…”