Journal
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
Volume 8, Issue 3, Pages 2179-2191Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JESTPE.2019.2956166
Keywords
Aircraft propulsion; ceramic capacitor; DC-AC power converters; flying capacitor multilevel converter (FCML); gallium nitride (GaN); high-density inverter; inverter; phase shifted PWM (PSPWM); specific power density
Categories
Funding
- NASA Fixed Wing research program through NASA [NNX14AL79A]
- Power Optimization of ElectroThermal Systems (POETS) NSF Engineering Research Center
- NASA [NNX14AL79A, 678833] Funding Source: Federal RePORTER
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Multilevel topologies are an appealing method to achieve higher power density converters for both mobile and stationary systems. This article discusses the design and high-performance hardware implementation of a 13-level, flying capacitor multilevel (FCML) inverter. Derivation of flying capacitor sizing for ac output voltages (for an arbitrary level FCML) is provided. Operating from an 800-Vdc bus, this hardware prototype utilizes switch modules with 100-V rating. Moreover, a 120-kHz switching frequency is enabled through the use of gallium nitride (GaN) FETs and the development of custom-integrated switching cells, which reduce commutation loop inductance and allow for a modular design. The frequency multiplication effect of FCML inverters allows the output inductor of the inverter to be made exceptionally small (4.7 mu H) while maintaining a 0.7% total harmonic distortion (THD) due to the 1.44-MHz effective inductor ripple frequency.
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