Switching Losses in a SiC-Based DC-DC Multilevel Boost Converter

Omid Mostaghimi; Nicolas G. Wright; Alton B. Horsfall

doi:10.4028/www.scientific.net/MSF.717-720.1241

Paper Titles

10 kV SiC Power MOSFETs and JBS Diodes: Enabling Revolutionary Module and Power Conversion Technologies
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SiC JFET Power Modules for Reliable 250°C Operation
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A Compact 5-nH One-Phase-Leg SiC Power Module for a 600V-60A-40W/cc Inverter
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Performance of a 25kW 700V Galvanically Isolated Bidirectional DC-DC Converter Using 1.2kV Silicon Carbide MOSFETs and Schottky Diodes
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Switching Losses in a SiC-Based DC-DC Multilevel Boost Converter
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High Voltage SiC Schottky Diodes in Rectifiers for X-Ray Generators
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SiC Solid-State Disconnect for High Power System Applications
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A 450°C High Voltage Gain AC Coupled Differential Amplifier
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Bipolar Integrated OR-NOR Gate in 4H-SiC
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HomeMaterials Science ForumMaterials Science Forum Vols. 717-720Switching Losses in a SiC-Based DC-DC Multilevel...

Switching Losses in a SiC-Based DC-DC Multilevel Boost Converter

Abstract:

In the aerospace industry where the weight and power density are important design parameters, high frequency operation results in smaller passive components. Furthermore, to achieve a large voltage conversion ratio, which is a goal for payload systems, the use of transformers increases the size and power losses of the system. To fulfill the space and weight requirements, a transformer-less SiC-based DC-DC multilevel converter providing high voltage conversion ratios without an extremely high duty cycle has been realized. The experimental high switching frequency and low current results for a conventional, 3-level and 4-level converter utilizing Si and SiC based COTS diodes are presented. SiC-based multilevel converters show a higher efficiency due to the low reverse recovery and fast switching of the diodes, which results in a higher voltage conversion ratio. This translates to a lower duty cycle to obtain the required output voltage, whilst eliminating the need for complex filtering even under light load conditions.