High Current Ripple for Power Density and Efficiency Improvement in Wide Bandgap Transistor-Based Buck Converters


With the recent development and availability of wide bandgap devices within the market, more and additional power converters are being designed with such devices. Given their quick commutation, in comparison to their equivalent Si-based mostly counterparts, these new devices permit increasing the converter's efficiency and/or power density. However, so as to fully avail these new devices, one should exactly apprehend their switching characteristics and exploit it the most effective method attainable. This paper recalls our own precise methodology to measure separately turn-on and flip-off energies of wide bandgap devices. This methodology is applied to commercially on the market SiC and GaN transistors and results show that they present a lot of lower flip-off than flip-on energies. For that reason, we show that a SiC-based buck converter should have high current ripple in the output filter inductor in order to decrease transistor losses. Analysis of those losses with experimental results are presented. Finally, the precise style of a two-kW SiC-based mostly buck converter for aircraft applications is performed for various current ripples and switching frequencies. We show that current ripple beyond 250% of the dc load current considerably decreases the converter's losses, and consequently permits the rise of the switching frequency, which reduces the system volume and weight.

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